Version: 2.3.3

Source / Input

`blank`

Produce silence and blank images.

Type:

(?id : string?, ?duration : {float}) -> source('a)
where 'a is a set of internal tracks

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type {float}, which defaults to -1.0): Duration of blank tracks in seconds, Negative value means forever.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`debug.is_ready`

A source that always produces an empty frame when the underlying source is not ready, used for testing and debugging.

Type:

(?id : string?, source('a)) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type source('a))

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

This function is experimental.

`input`

Input an audio stream using the default operator.

Type:

(?id : string?, ?start : bool, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?fallible : bool) -> source(audio=pcm('A))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
start (of type bool, which defaults to true): Automatically start outputting whenever possible. If true, an infallible (normal) output will start outputting as soon as it is created, and a fallible output will (re)start as soon as its source becomes available for streaming.
on_start (of type () -> unit, which defaults to {()}): Callback executed when outputting starts.
on_stop (of type () -> unit, which defaults to {()}): Callback executed when outputting stops.
fallible (of type bool, which defaults to false): Allow the child source to fail, in which case the output will be (temporarily) stopped.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.

`input.alsa`

Stream from an ALSA input device.

Type:

(?id : string?, ?buffer_size : float?, ?device : string, ?fallible : bool,
 ?on_start : (() -> unit), ?on_stop : (() -> unit), ?self_sync : bool,
 ?start : bool) -> source(audio=pcm('a))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer_size (of type float?, which defaults to null): ALSA buffer size in seconds. Defaults to frame duration when null.
device (of type string, which defaults to "default"): Alsa device to use
fallible (of type bool, which defaults to false): Allow the source to fail. If set to false, start must be true and stop method raises an error.
on_start (of type () -> unit, which defaults to {()}): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to {()}): Callback executed when input stops.
self_sync (of type bool, which defaults to true): Mark the source as being synchronized by the ALSA driver.
start (of type bool, which defaults to true): Start input as soon as it is available.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.

`input.external.avi`

Stream data from an external application.

Type:

(?id : string?, ?buffer : float, ?max : float, ?restart : bool,
 ?restart_on_error : bool, {string}) -> source(audio=pcm('a),
video=canvas('b))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer (of type float, which defaults to 1.0): Duration of the pre-buffered data.
max (of type float, which defaults to 10.0): Maximum duration of the buffered data.
restart (of type bool, which defaults to true): Restart process when exited.
restart_on_error (of type bool, which defaults to false): Restart process when exited with error.
(unlabeled) (of type {string}): Command to execute.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

This function is experimental.

`input.external.rawaudio`

Stream raw PCM data (interleaved signed 16 bits little endian integers) from an external application.

Type:

(?id : string?, ?buffer : float, ?channels : int, ?max : float,
 ?restart : bool, ?restart_on_error : bool, ?samplerate : int, {string}) ->
source(audio=pcm('a))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer (of type float, which defaults to 2.0): Duration of the pre-buffered data.
channels (of type int, which defaults to 2): Number of channels.
max (of type float, which defaults to 10.0): Maximum duration of the buffered data.
restart (of type bool, which defaults to true): Restart process when exited.
restart_on_error (of type bool, which defaults to false): Restart process when exited with error.
samplerate (of type int, which defaults to 44100): Samplerate.
(unlabeled) (of type {string}): Command to execute.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`input.external.rawvideo`

Stream data from an external application.

Type:

(?id : string?, ?buffer : float, ?max : float, ?restart : bool,
 ?restart_on_error : bool, {string}) -> source(video=canvas('a))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer (of type float, which defaults to 1.0): Duration of the pre-buffered data.
max (of type float, which defaults to 10.0): Maximum duration of the buffered data.
restart (of type bool, which defaults to true): Restart process when exited.
restart_on_error (of type bool, which defaults to false): Restart process when exited with error.
(unlabeled) (of type {string}): Command to execute.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

This function is experimental.

`input.external.wav`

Stream WAV data from an external application.

Type:

(?id : string?, ?buffer : float, ?max : float, ?restart : bool,
 ?restart_on_error : bool, {string}) -> source(audio=pcm('a))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buffer (of type float, which defaults to 2.0): Duration of the pre-buffered data.
max (of type float, which defaults to 10.0): Maximum duration of the buffered data.
restart (of type bool, which defaults to true): Restart process when exited.
restart_on_error (of type bool, which defaults to false): Restart process when exited with error.
(unlabeled) (of type {string}): Command to execute.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`input.ffmpeg`

Create a stream using ffmpeg

Type:

(?id : string?, ?debug : bool, ?deduplicate_metadata : bool,
 ?float_args : [string * float], ?format : string?,
 ?int_args : [string * int], ?max_buffer : float,
 ?metadata_filter : (([string * string]) -> [string * string])?,
 ?new_track_on_metadata : bool, ?on_connect : (() -> unit),
 ?on_disconnect : (() -> unit),
 ?on_error : ((error
               .{
                 kind : string,
                 message : string,
                 trace : [
                          {
                            cstart : int,
                            cstop : int,
                            filename : string,
                            lstart : int,
                            lstop : int,
                            to_string : (?prefix : string) -> string
                          }]
               }) -> unit),
 ?on_start : (() -> unit), ?on_stop : (() -> unit), ?poll_delay : float,
 ?self_sync : {bool}, ?start : bool, ?string_args : [string * string],
 ?trim_url : bool, {string}) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
debug (of type bool, which defaults to false): Run in debugging mode, not catching some exceptions.
deduplicate_metadata (of type bool, which defaults to true): Prevent duplicated metadata.
float_args (of type [string * float], which defaults to [])
format (of type string?, which defaults to null): Force a specific input format. Autodetected when passed a null argument
int_args (of type [string * int], which defaults to [])
max_buffer (of type float, which defaults to 5.0): Maximum uration of buffered data
metadata_filter (of type (([string * string]) -> [string * string])?, which defaults to null): Metadata filter function. Returned metadata are set a metadata. Default: filter id3v2_priv metadata.
new_track_on_metadata (of type bool, which defaults to true): Treat new metadata as new track.
on_connect (of type () -> unit, which defaults to {()}): Function to execute when a source is connected.
on_disconnect (of type () -> unit, which defaults to {()}): Function to execute when a source is disconnected
on_error (of type (error .{ kind : string, message : string, trace : [ { cstart : int, cstop : int, filename : string, lstart : int, lstop : int, to_string : (?prefix : string) -> string }] }) -> unit, which defaults to fun (_) -> ()): Callback executed when an error occurs.
on_start (of type () -> unit, which defaults to {()}): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to {()}): Callback executed when input stops.
poll_delay (of type float, which defaults to 2.0): Polling delay when trying to connect to the stream.
self_sync (of type {bool}, which defaults to false): Should the source control its own timing? Set to true if you are having synchronization issues. Should be false for most typical cases.
start (of type bool, which defaults to true): Start input as soon as it is available.
string_args (of type [string * string], which defaults to [])
trim_url (of type bool, which defaults to true): Trim input URL.
(unlabeled) (of type {string}): URL to decode.

Methods:

buffer_length (of type () -> float): Get the buffer's length in seconds.
buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
set_url (of type ({string}) -> unit): Set the source's url.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
status (of type () -> string): Return the current status of the source, either "stopped" (the source isn't trying to relay the HTTP stream), "starting" (polling task is about to begin) "polling" (attempting to connect to the HTTP stream), "connected " (connected to , buffering or playing back the stream) or "stopping" (source is stopping).
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.
url (of type () -> string): Return the source's current url.

`input.harbor`

Create a source that receives a http/icecast stream and forwards it as a stream.

Type:

(?id : string?,
 ?auth : (({address : string, password : string, user : string}) -> bool)?,
 ?buffer : float, ?debug : bool, ?dumpfile : string?, ?icy : bool,
 ?icy_metadata_charset : string?, ?logfile : string?, ?max : float,
 ?metadata_charset : string?, ?on_connect : (([string * string]) -> unit),
 ?on_disconnect : (() -> unit), ?password : string, ?port : int,
 ?replay_metadata : bool, ?timeout : float, ?transport : http_transport,
 ?user : string, string) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
auth (of type (({address : string, password : string, user : string}) -> bool)?, which defaults to null): Authentication function. Receives a record with: user, password and address (client network address) and returns true if the user should be granted access for this login. Override any other method if used.
buffer (of type float, which defaults to 12.0): Duration of the pre-buffered data (in seconds). Default value is set to make it possible to use crossfade transitions with input.harbor. You might be able to reduce it but, in this case, make sure to not use the operator with crossfade or make sure that it has enough buffered data for it.
debug (of type bool, which defaults to false): Run in debugging mode by not catching some exceptions.
dumpfile (of type string?, which defaults to null): Dump stream to file, for debugging purpose. Disabled if null.
icy (of type bool, which defaults to false): Enable ICY (shoutcast) protocol.
icy_metadata_charset (of type string?, which defaults to null): ICY (shoutcast) metadata charset. Guessed if null. Default for shoutcast is ISO-8859-1. Set to that value if all your clients send metadata using this charset and automatic detection is not working for you.
logfile (of type string?, which defaults to null): Log buffer status to file, for debugging purpose. Disabled if null.
max (of type float, which defaults to 20.0): Maximum duration of the buffered data (in seconds).
metadata_charset (of type string?, which defaults to null): Metadata charset for non-ICY (shoutcast) source protocols. Guessed if null.
on_connect (of type ([string * string]) -> unit, which defaults to fun (_) -> ()): Function to execute when a source is connected. Its receives the list of headers, of the form: (,). All labels are lowercase.
on_disconnect (of type () -> unit, which defaults to {()}): Functions to execute when a source is disconnected
password (of type string, which defaults to "hackme"): Source password.
port (of type int, which defaults to 8005): Port used to connect to the source.
replay_metadata (of type bool, which defaults to false): Replay last known metadata when switching back to this source. This helps when source has dropped due to temporary connection issues.
timeout (of type float, which defaults to 30.0): Timeout for source connectionn.
transport (of type http_transport, which defaults to <unix_transport>): Http transport. Use http.transport.ssl or http.transport.secure_transport, when available, to enable HTTPS output
user (of type string, which defaults to "source"): Source user.
(unlabeled) (of type string): Mountpoint to look for.

Methods:

buffer_length (of type () -> float): Length of the buffer (in seconds).
buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
connected_client (of type () -> string?): Returns the address of the client currently connected, if there is one.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
status (of type () -> string): Current status of the input.
stop (of type () -> unit): Disconnect the client currently connected to the harbor. Does nothing if no client is connected.
time (of type () -> float): Get a source's time, based on its assigned clock.

`input.hls`

Play an HLS stream.

Type:

(?id : string?, {string}) -> source('A)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type {string}): Playlist URI.

Methods:

buffer_length (of type () -> float): Get the buffer's length in seconds.
buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
set_url (of type ({string}) -> unit): Set the source's url.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
status (of type () -> string): Return the current status of the source, either "stopped" (the source isn't trying to relay the HTTP stream), "starting" (polling task is about to begin) "polling" (attempting to connect to the HTTP stream), "connected " (connected to , buffering or playing back the stream) or "stopping" (source is stopping).
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.
url (of type () -> string): Return the source's current url.

`input.hls.native`

Play an HLS stream.

Type:

(?id : string?, ?reload : float, string) -> source('a)
where 'a is a set of tracks to be muxed into a source

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
reload (of type float, which defaults to 10.0): How often (in seconds) the playlist should be reloaded.
(unlabeled) (of type string): Playlist URI.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

This function is experimental.

`input.http`

Create a http stream using ffmpeg

Type:

(?id : string?, ?debug : bool, ?deduplicate_metadata : bool,
 ?float_args : [string * float], ?format : string?,
 ?int_args : [string * int], ?max_buffer : float,
 ?metadata_filter : (([string * string]) -> [string * string])?,
 ?new_track_on_metadata : bool, ?on_connect : (([string * string]) -> unit),
 ?on_disconnect : (() -> unit),
 ?on_error : ((error
               .{
                 kind : string,
                 message : string,
                 trace : [
                          {
                            cstart : int,
                            cstop : int,
                            filename : string,
                            lstart : int,
                            lstop : int,
                            to_string : (?prefix : string) -> string
                          }]
               }) -> unit),
 ?on_start : (() -> unit), ?on_stop : (() -> unit), ?poll_delay : float,
 ?self_sync : {bool?}, ?start : bool, ?string_args : [string * string],
 ?timeout : float, ?trim_url : bool, ?user_agent : string, {string}) ->
source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
debug (of type bool, which defaults to false): Run in debugging mode, not catching some exceptions.
deduplicate_metadata (of type bool, which defaults to true): Prevent duplicated metadata.
float_args (of type [string * float], which defaults to [])
format (of type string?, which defaults to null): Force a specific input format. Autodetected when passed a null argument
int_args (of type [string * int], which defaults to [])
max_buffer (of type float, which defaults to 5.0): Maximum uration of buffered data
metadata_filter (of type (([string * string]) -> [string * string])?, which defaults to null): Metadata filter function. Returned metadata are set a metadata. Default: filter id3v2_priv metadata.
new_track_on_metadata (of type bool, which defaults to true): Treat new metadata as new track.
on_connect (of type ([string * string]) -> unit, which defaults to fun (_) -> ()): Function to execute when a source is connected. Its receives the list of ICY-specific headers, if available.
on_disconnect (of type () -> unit, which defaults to {()}): Function to execute when a source is disconnected
on_error (of type (error .{ kind : string, message : string, trace : [ { cstart : int, cstop : int, filename : string, lstart : int, lstop : int, to_string : (?prefix : string) -> string }] }) -> unit, which defaults to fun (_) -> ()): Callback executed when an error occurs.
on_start (of type () -> unit, which defaults to {()}): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to {()}): Callback executed when input stops.
poll_delay (of type float, which defaults to 2.0): Polling delay when trying to connect to the stream.
self_sync (of type {bool?}, which defaults to null): Should the source control its own timing? If null, the source will control its latency if it can be detected that it is connecting to an icecast or shoutcast server. Otherwise, see input.ffmpeg for more details about this option.
start (of type bool, which defaults to true): Start input as soon as it is available.
string_args (of type [string * string], which defaults to [])
timeout (of type float, which defaults to 10.0): Timeout for source connection.
trim_url (of type bool, which defaults to true): Trim input URL.
user_agent (of type string, which defaults to "Liquidsoap/2.3.3 (Unix; OCaml 4.14.2)"): User agent.
(unlabeled) (of type {string}): URL to decode.

Methods:

buffer_length (of type () -> float): Get the buffer's length in seconds.
buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
set_url (of type ({string}) -> unit): Set the source's url.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
status (of type () -> string): Return the current status of the source, either "stopped" (the source isn't trying to relay the HTTP stream), "starting" (polling task is about to begin) "polling" (attempting to connect to the HTTP stream), "connected " (connected to , buffering or playing back the stream) or "stopping" (source is stopping).
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.
url (of type () -> string): Return the source's current url.

`input.jack`

Get stream from jack.

Type:

(?id : string?, ?fallible : bool, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?self_sync : bool, ?server : string, ?start : bool) ->
source(audio=pcm('a))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
fallible (of type bool, which defaults to false): Allow the source to fail. If set to false, start must be true and stop method raises an error.
on_start (of type () -> unit, which defaults to {()}): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to {()}): Callback executed when input stops.
self_sync (of type bool, which defaults to true): Mark the source as being synchronized by the jack server.
server (of type string, which defaults to ""): Jack server to connect to.
start (of type bool, which defaults to true): Start input as soon as it is available.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.

`input.keyboard.sdl`

Play notes from the keyboard.

Type:

(?id : string?, ?velocity : float) -> source(midi=midi('a))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
velocity (of type float, which defaults to 0.8): Velocity of notes.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

This function is experimental.

`input.oss`

Stream from an OSS input device.

Type:

(?id : string?, ?device : string, ?fallible : bool, ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?self_sync : bool, ?start : bool) ->
source(audio=pcm('a))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
device (of type string, which defaults to "/dev/dsp"): OSS device to use.
fallible (of type bool, which defaults to false): Allow the source to fail. If set to false, start must be true and stop method raises an error.
on_start (of type () -> unit, which defaults to {()}): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to {()}): Callback executed when input stops.
self_sync (of type bool, which defaults to true): Mark the source as being synchronized by the OSS driver.
start (of type bool, which defaults to true): Start input as soon as it is available.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.

`input.portaudio`

Stream from a portaudio input device.

Type:

(?id : string?, ?buflen : int, ?device_id : int?, ?fallible : bool,
 ?latency : float?, ?on_start : (() -> unit), ?on_stop : (() -> unit),
 ?self_sync : bool, ?start : bool) -> source(audio=pcm('a))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
buflen (of type int, which defaults to 256): Length of a buffer in samples.
device_id (of type int?, which defaults to null): Device ID. Uses default device if null.
fallible (of type bool, which defaults to false): Allow the source to fail. If set to false, start must be true and stop method raises an error.
latency (of type float?, which defaults to null): Device latency. Only used when specifying device ID.
on_start (of type () -> unit, which defaults to {()}): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to {()}): Callback executed when input stops.
self_sync (of type bool, which defaults to true): Mark the source as being synchronized by the portaudio driver.
start (of type bool, which defaults to true): Start input as soon as it is available.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.

`input.pulseaudio`

Stream from a pulseaudio input device.

Type:

(?id : string?, ?client : string, ?device : string?, ?fallible : bool,
 ?on_error : ((string) -> unit), ?on_start : (() -> unit),
 ?on_stop : (() -> unit), ?retry_delay : float, ?self_sync : bool,
 ?start : bool) -> source(audio=pcm('a))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
client (of type string, which defaults to "liquidsoap")
device (of type string?, which defaults to null): Device to use. Uses default if set to null.
fallible (of type bool, which defaults to true): Allow the source to fail. If set to false, start must be true and stop method raises an error.
on_error (of type (string) -> unit, which defaults to fun (_) -> ()): Function executed when an operation with the pulseaudio server returns an error.
on_start (of type () -> unit, which defaults to {()}): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to {()}): Callback executed when input stops.
retry_delay (of type float, which defaults to 1.0): When fallible, time to wait before trying to connect again.
self_sync (of type bool, which defaults to true): Mark the source as being synchronized by the pulseaudio driver.
start (of type bool, which defaults to true): Start input as soon as it is available.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.

`input.rtmp`

Read an RTMP stream.

Type:

(?id : string?, ?max_buffer : float, ?listen : bool, {string}) -> source('a)

Arguments:

id (of type string?, which defaults to null)
max_buffer (of type float, which defaults to 5.0): Maximum data buffer in seconds
listen (of type bool, which defaults to true): Act as a RTMP server and wait for incoming connection
(unlabeled) (of type {string}): URL to read RTMP from, in the form rtmp://IP:PORT/ENDPOINT

Methods:

buffer_length (of type () -> float): Get the buffer's length in seconds.
buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
set_url (of type ({string}) -> unit): Set the source's url.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
start (of type () -> unit): Ask the source or output to start.
status (of type () -> string): Return the current status of the source, either "stopped" (the source isn't trying to relay the HTTP stream), "starting" (polling task is about to begin) "polling" (attempting to connect to the HTTP stream), "connected " (connected to , buffering or playing back the stream) or "stopping" (source is stopping).
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.
url (of type () -> string): Return the source's current url.

`input.srt`

Receive a SRT stream from a distant agent.

Type:

(?id : string?, ?bind_address : string, ?connection_timeout : float?,
 ?content_type : string, ?dump : string, ?enforced_encryption : bool?,
 ?host : string, ?ipv6only : bool?,
 ?listen_callback : ((hs_version : int, peeraddr : string,
                      streamid : string?, srt_socket) -> bool)?,
 ?max : float, ?messageapi : bool, ?mode : string,
 ?on_connect : (() -> unit), ?on_disconnect : (() -> unit),
 ?on_socket : ((mode : string, srt_socket) -> unit)?,
 ?on_start : (() -> unit), ?on_stop : (() -> unit), ?passphrase : string?,
 ?payload_size : int, ?pbkeylen : int?, ?polling_delay : float, ?port : int,
 ?prefer_address : string?, ?read_timeout : float?, ?self_sync : bool,
 ?start : bool, ?streamid : string?, ?write_timeout : float?) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
bind_address (of type string, which defaults to "0.0.0.0"): Address to bind on the local machine. Used only in listener mode
connection_timeout (of type float?, which defaults to null): Timeout, in seconds, after which initial connection operations are aborted if no data was received. Uses library's default if null. Used only in client mode.
content_type (of type string, which defaults to "application/ffmpeg"): Content-Type (mime type) used to find a decoder for the input stream.
dump (of type string, which defaults to ""): Dump received data to the given file for debugging. Unused is empty.
enforced_encryption (of type bool?, which defaults to null): Enforces that both connection parties have the same passphrase set, or both do not set the passphrase, otherwise the connection is rejected.
host (of type string, which defaults to "localhost"): Address to connect to. Used only in caller mode.
ipv6only (of type bool?, which defaults to null): If true and mode is set to listen, only ipv6 connections are accepted. When null, defaults to true when the bind_address is a ipv6 address and system defaults otherwise.
listen_callback (of type ((hs_version : int, peeraddr : string, streamid : string?, srt_socket) -> bool)?, which defaults to null): Callback used to decide whether to accept new incoming connections. Used in listener mode only.
max (of type float, which defaults to 10.0): Maximum duration of the buffered data.
messageapi (of type bool, which defaults to true): Use message api
mode (of type string, which defaults to "listener"): Mode to operate on. One of: "listener" (waits for connection to come in) or "caller" (initiate connection to a remote server)
on_connect (of type () -> unit, which defaults to {()}): Function to execute when connected.
on_disconnect (of type () -> unit, which defaults to {()}): Function to execute when disconnected
on_socket (of type ((mode : string, srt_socket) -> unit)?, which defaults to null): Callback executed when a new SRT socket is created to set additional options, add monitoring, etc. mode should be one of: "connect" (socket created before connecting to a remote address), "listen" (socket created before binding for receiving new incoming connections), "incoming" (socket received as incoming connection) or "close" (socket is about to closed).
on_start (of type () -> unit, which defaults to {()}): Callback executed when input starts.
on_stop (of type () -> unit, which defaults to {()}): Callback executed when input stops.
passphrase (of type string?, which defaults to null): When set to a non-empty string, this option enables encryption and sets the passphrase for it. See libsrt documentation for more details.
payload_size (of type int, which defaults to 1316): Payload size.
pbkeylen (of type int?, which defaults to null): Set encryption key length. See libsrt documentation for more details.
polling_delay (of type float, which defaults to 2.0): Delay between connection attempts. Used only in caller mode.
port (of type int, which defaults to 8000): Port to bind on the local machine (listener mode) or to connect to (caller mode). The term port as used in SRT is occasionally identical to the term UDP port. However SRT offers more flexibility than UDP because it manages ports as its own resources. For example, one port may be shared between various services.
prefer_address (of type string?, which defaults to null): Preferred address type when resolving hostnames. One of: "system", "ipv4" or "ipv6". Defaults to global srt.prefer_connection settings when null.
read_timeout (of type float?, which defaults to 1.0): Timeout, in seconds, after which read operations are aborted if no data was received, indefinite if null.
self_sync (of type bool, which defaults to true): true if the source controls its own latency (i.e. the SRT stream is in live mode), false otherwise (i.e. the stream is in file mode.
start (of type bool, which defaults to true): Start input as soon as it is available.
streamid (of type string?, which defaults to null): Set streamid. This value can be retrieved by the listener side when connecting to it. Used in caller mode only.
write_timeout (of type float?, which defaults to 1.0): Timeout, in seconds, after which write operations are aborted if no data was received, indefinite if null.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
connect (of type () -> unit): In sender mode, connect to remote server. In listener mode, setup listening socket.
disconnect (of type () -> unit): Disconnect all connected socket.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_started (of type () -> bool): true if the output or source is started.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
shutdown (of type () -> unit): Shutdown the output or source.
skip (of type () -> unit): Skip to the next track.
sockets (of type () -> [string * srt_socket]): List of (connected_address, connected_socket)
start (of type () -> unit): Ask the source or output to start.
stop (of type () -> unit): Ask the source or output to stop.
time (of type () -> float): Get a source's time, based on its assigned clock.

`input.v4l2`

Stream from a video4linux2 input device, such as a webcam.

Type:

(?id : string?, ?max_buffer : float, ?device : string) ->
source(video=canvas('a))

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
max_buffer (of type float, which defaults to 0.5): Maximum data buffer in seconds
device (of type string, which defaults to "/dev/video0"): V4L2 device to use.

`native.request.dynamic`

Play request dynamically created by a given function.

Type:

(?id : string?, ?available : {bool}, ?prefetch : int?,
 ?retry_delay : {float}, ?synchronous : bool, ?timeout : float?,
 ?native : bool, (() -> request?)) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
available (of type {bool}, which defaults to true): Whether some new requests are available (when set to false, it stops after current playing request).
prefetch (of type int?, which defaults to null): How many requests should be queued in advance.
retry_delay (of type {float}, which defaults to 0.1): Retry after a given time (in seconds) when callback returns null or an error occurs while resolving a returned request.
synchronous (of type bool, which defaults to false): If true, new requests are prepared as needed instead of using an asynchronous queue.
timeout (of type float?, which defaults to null): Timeout (in sec.) to resolve the request. Defaults to settings.request.timeout when null.
native (of type bool, which defaults to false)
(unlabeled) (of type () -> request?)

Methods:

add (of type (request) -> bool):
buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
current (of type () -> request?):
current_source (of type () -> source('A)?): Return the source currently selected.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
fetch (of type () -> bool):
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
prepare (of type (source('A)) -> unit): Prepare a source that will be returned later.
queue (of type () -> [request]):
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
set_queue (of type ([request]) -> unit):
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`noise`

Generate audio/video noise source.

Type:

(?id : string?, ?duration : float?) -> source('a)
where 'a is a set of internal tracks

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`playlist`

Read a playlist or a directory and play all files.

Type:

(?id : string?, ?check_next : ((request) -> bool)?, ?prefetch : int?,
 ?loop : bool, ?max_fail : int, ?mime_type : string?, ?mode : string,
 ?native : bool, ?on_done : (() -> unit), ?on_fail : (() -> [string])?,
 ?on_reload : ((string) -> unit), ?prefix : string, ?reload : int,
 ?reload_mode : string, ?timeout : float?, ?cue_in_metadata : string?,
 ?cue_out_metadata : string?, ?register_server_commands : bool, string) ->
source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
check_next (of type ((request) -> bool)?, which defaults to null): Function used to filter next tracks. A candidate track is only validated if the function returns true on it. The function is called before resolution, hence metadata will only be available for requests corresponding to local files. This is typically used to avoid repetitions, but be careful: if the function rejects all attempts, the playlist will enter into a consuming loop and stop playing anything.
prefetch (of type int?, which defaults to null): How many requests should be queued in advance.
loop (of type bool, which defaults to true): Loop on the playlist.
max_fail (of type int, which defaults to 10): When this number of requests fail to resolve, the whole playlists is considered as failed and on_fail is called.
mime_type (of type string?, which defaults to null): Default MIME type for the playlist. null means automatic detection.
mode (of type string, which defaults to "randomize"): Play the files in the playlist either in the order ("normal" mode), or shuffle the playlist each time it is loaded, and play it in this order for a whole round ("randomize" mode), or pick a random file in the playlist each time ("random" mode).
native (of type bool, which defaults to false): Use native implementation.
on_done (of type () -> unit, which defaults to {()}): Function executed when the playlist is finished.
on_fail (of type (() -> [string])?, which defaults to null): Function executed when too many requests failed and returning the contents of a fixed playlist.
on_reload (of type (string) -> unit, which defaults to fun (_) -> ()): Callback called after playlist has reloaded.
prefix (of type string, which defaults to ""): Add a constant prefix to all requests. Useful for passing extra information using annotate, or for resolution through a particular protocol, such as replaygain.
reload (of type int, which defaults to 0): Amount of time (in seconds or rounds), when applicable, before which the playlist is reloaded; 0 means never.
reload_mode (of type string, which defaults to "seconds"): Unit of the reload parameter, either "never" (never reload the playlist), "rounds", "seconds" or "watch" (reload the file whenever it is changed).
timeout (of type float?, which defaults to null): Timeout (in sec.) to resolve the request. Defaults to settings.request.timeout when null.
cue_in_metadata (of type string?, which defaults to "liq_cue_in"): Metadata for cue in points. Disabled if null.
cue_out_metadata (of type string?, which defaults to "liq_cue_out"): Metadata for cue out points. Disabled if null.
register_server_commands (of type bool, which defaults to true): Register corresponding server commands
(unlabeled) (of type string): Playlist URI.

Methods:

add (of type (request) -> bool): Add a request to the queue. Requests are resolved before being added. Returns true if the request was successfully added.
buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
current (of type () -> request?): Get the request currently being played.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
fetch (of type () -> bool): Try feeding the queue with a new request. Returns true if successful. This method can take long to return and should usually be run in a separate thread.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
length (of type () -> int): Length of the of the playlist (the number of songs it contains).
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
queue (of type () -> [request]): Get the requests currently in the queue.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
reload (of type (?empty_queue : bool, ?uri : string?) -> unit): Reload the playlist.
remaining (of type () -> float): Estimation of remaining time in the current track.
remaining_files (of type () -> [string]): Songs remaining to be played.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
set_queue (of type ([request]) -> unit): Set the queue of requests. Requests are resolved before being added to the queue. You are responsible for destroying the requests currently in the queue.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`playlist.list`

Play a list of files.

Type:

(?id : string?, ?check_next : ((request) -> bool)?, ?prefetch : int?,
 ?loop : bool, ?mode : string, ?native : bool, ?on_loop : (() -> unit),
 ?on_done : (() -> unit), ?max_fail : int, ?on_fail : (() -> [string])?,
 ?timeout : float?, ?cue_in_metadata : string?, ?cue_out_metadata : string?,
 [string]) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
check_next (of type ((request) -> bool)?, which defaults to null): Function used to filter next tracks. A candidate track is only validated if the function returns true on it. The function is called before resolution, hence metadata will only be available for requests corresponding to local files. This is typically used to avoid repetitions, but be careful: if the function rejects all attempts, the playlist will enter into a consuming loop and stop playing anything.
prefetch (of type int?, which defaults to null): How many requests should be queued in advance.
loop (of type bool, which defaults to true): Loop on the playlist.
mode (of type string, which defaults to "normal"): Play the files in the playlist either in the order ("normal" mode), or shuffle the playlist each time it is loaded, and play it in this order for a whole round ("randomize" mode), or pick a random file in the playlist each time ("random" mode).
native (of type bool, which defaults to false): Use native implementation, when available.
on_loop (of type () -> unit, which defaults to {()}): Function executed when the playlist is about to loop.
on_done (of type () -> unit, which defaults to {()}): Function executed when the playlist is finished.
max_fail (of type int, which defaults to 10): When this number of requests fail to resolve, the whole playlists is considered as failed and on_fail is called.
on_fail (of type (() -> [string])?, which defaults to null): Function executed when too many requests failed and returning the contents of a fixed playlist.
timeout (of type float?, which defaults to null): Timeout (in sec.) to resolve the request. Defaults to settings.request.timeout when null.
cue_in_metadata (of type string?, which defaults to "liq_cue_in"): Metadata for cue in points. Disabled if null.
cue_out_metadata (of type string?, which defaults to "liq_cue_out"): Metadata for cue out points. Disabled if null.
(unlabeled) (of type [string]): Playlist.

Methods:

add (of type (request) -> bool): Add a request to the queue. Requests are resolved before being added. Returns true if the request was successfully added.
buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
current (of type () -> request?): Get the request currently being played.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
fetch (of type () -> bool): Try feeding the queue with a new request. Returns true if successful. This method can take long to return and should usually be run in a separate thread.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
queue (of type () -> [request]): Get the requests currently in the queue.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
reload (of type (?empty_queue : bool, [string]) -> unit): Reload the playlist with given list of songs.
remaining (of type () -> float): Estimation of remaining time in the current track.
remaining_files (of type () -> [string]): Songs remaining to be played.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
set_queue (of type ([request]) -> unit): Set the queue of requests. Requests are resolved before being added to the queue. You are responsible for destroying the requests currently in the queue.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`request.dynamic`

Play request dynamically created by a given function.

Type:

(?id : string?, ?available : {bool}, ?prefetch : int?,
 ?retry_delay : {float}, ?synchronous : bool, ?timeout : float?,
 ?native : bool, (() -> request?)) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
available (of type {bool}, which defaults to true): Whether some new requests are available (when set to false, it stops after current playing request).
prefetch (of type int?, which defaults to null): How many requests should be queued in advance.
retry_delay (of type {float}, which defaults to 0.1): Retry after a given time (in seconds) when callback returns null or an error occurs while resolving a returned request.
synchronous (of type bool, which defaults to false): If true, new requests are prepared as needed instead of using an asynchronous queue.
timeout (of type float?, which defaults to null): Timeout (in sec.) to resolve the request. Defaults to settings.request.timeout when null.
native (of type bool, which defaults to false)
(unlabeled) (of type () -> request?)

Methods:

add (of type (request) -> bool): Add a request to the queue. Requests are resolved before being added. Returns true if the request was successfully added.
buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
current (of type () -> request?): Get the request currently being played.
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
fetch (of type () -> bool): Try feeding the queue with a new request. Returns true if successful. This method can take long to return and should usually be run in a separate thread.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
queue (of type () -> [request]): Get the requests currently in the queue.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
set_queue (of type ([request]) -> unit): Set the queue of requests. Requests are resolved before being added to the queue. You are responsible for destroying the requests currently in the queue.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`request.once`

Play a request once and become unavailable.

Type:

(?id : string?, ?timeout : float?, request) -> source('a)

Arguments:

id (of type string?, which defaults to "request.once")
timeout (of type float?, which defaults to null): Timeout in seconds for resolving the request.
(unlabeled) (of type request): Request to play.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
request (of type request):
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
resolve (of type () -> bool):
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`request.single`

Loop on a request. It never fails if the request is static, meaning that it can be fetched once. Typically, http, ftp, say requests are static, and time is not.

Type:

(?id : string?, ?prefetch : int?, ?timeout : float?, ?fallible : bool?,
 {request}) -> source('a)

Arguments:

id (of type string?, which defaults to "request.single")
prefetch (of type int?, which defaults to null): How many requests should be queued in advance.
timeout (of type float?, which defaults to null): Timeout (in sec.) to resolve the request.
fallible (of type bool?, which defaults to null): Enforce fallibility of the request.
(unlabeled) (of type {request}): Request

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`saw`

Generate a saw wave.

Type:

(?id : string?, ?amplitude : {float}, ?duration : float?, ?{float}) ->
source(audio=pcm*)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
amplitude (of type {float}, which defaults to 1.0): Maximal value of the waveform.
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).
(unlabeled) (of type {float}, which defaults to 440.0): Frequency of the saw.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`sine`

Generate a sine wave.

Type:

(?id : string?, ?amplitude : {float}, ?duration : float?, ?{float}) ->
source(audio=pcm*)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
amplitude (of type {float}, which defaults to 1.0): Maximal value of the waveform.
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).
(unlabeled) (of type {float}, which defaults to 440.0): Frequency of the sine.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`single`

Loop on a URI. It never fails if the request is static, meaning that it can be fetched once. Typically, http, ftp, say requests are static, and time is not.

Type:

(?prefetch : int?, ?timeout : float?, ?id : string?, ?fallible : bool,
 ?cue_in_metadata : string?, ?cue_out_metadata : string?, string) ->
source('a)

Arguments:

prefetch (of type int?, which defaults to null): How many requests should be queued in advance.
timeout (of type float?, which defaults to null): Timeout (in sec.) to resolve the request.
id (of type string?, which defaults to "single")
fallible (of type bool, which defaults to false): Enforce fallibility of the request.
cue_in_metadata (of type string?, which defaults to "liq_cue_in"): Metadata for cue in points. Disabled if null.
cue_out_metadata (of type string?, which defaults to "liq_cue_out"): Metadata for cue out points. Disabled if null.
(unlabeled) (of type string): URI where to find the file

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`source`

Create a source that muxes the given tracks.

Type:

(?id : string?, 'a.{metadata? : metadata, track_marks? : track_marks}) ->
source('a) where 'a is a set of tracks to be muxed into a source

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
(unlabeled) (of type 'a.{metadata? : metadata, track_marks? : track_marks} where 'a is a set of tracks to be muxed into a source): Tracks to mux

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`source.fail`

A source that does not produce anything. No silence, no track at all.

Type:

(?id : string?) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`source.fail.init`

A source that errors during its initialization phase, used for testing and debugging.

Type:

(?id : string?) -> source('a)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

This function is experimental.

`square`

Generate a square wave.

Type:

(?id : string?, ?amplitude : {float}, ?duration : float?, ?{float}) ->
source(audio=pcm*)

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
amplitude (of type {float}, which defaults to 1.0): Maximal value of the waveform.
duration (of type float?, which defaults to null): Duration in seconds (null means infinite).
(unlabeled) (of type {float}, which defaults to 440.0): Frequency of the square.

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

`video.testsrc`

Generate a test video.

Type:

(?id : string?, ?height : int, ?width : int) -> source('a)
where 'a is a set of internal tracks

Arguments:

id (of type string?, which defaults to null): Force the value of the source ID.
height (of type int, which defaults to -1)
width (of type int, which defaults to -1)

Methods:

buffered (of type () -> [string * float]): Length of buffered data.
clock (of type clock): The source's clock
duration (of type () -> float): Estimation of the duration of the current track.
elapsed (of type () -> float): Elapsed time in the current track.
fallible (of type bool): Indicate if a source may fail, i.e. may not be ready to stream.
id (of type () -> string): Identifier of the source.
is_active (of type () -> bool): true if the source is active, i.e. it is continuously animated by its own clock whenever it is ready. Typically, true for outputs and sources such as input.http.
is_ready (of type () -> bool): Indicate if a source is ready to stream. This does not mean that the source is currently streaming, just that its resources are all properly initialized.
is_up (of type () -> bool): Indicate that the source can be asked to produce some data at any time. This is true when the source is currently being used or if it could be used at any time, typically inside a switch or fallback.
last_metadata (of type () -> [string * string]?): Return the last metadata from the source.
log (of type {level : (() -> int).{set : (int) -> unit}}): Get or set the source's log level, from 1 to 5.
on_metadata (of type ((([string * string]) -> unit)) -> unit): Call a given handler on metadata packets.
on_shutdown (of type ((() -> unit)) -> unit): Register a function to be called when source shuts down.
on_track (of type ((([string * string]) -> unit)) -> unit): Call a given handler on new tracks.
on_wake_up (of type ((() -> unit)) -> unit): Register a function to be called after the source is asked to get ready. This is when, for instance, the source's final ID is set.
register_command (of type (?usage : string?, description : string, string, ((string) -> string)) -> unit): Register a server command for this source. Command is registered under the source's id namespace when it gets up and de-registered when it gets down.
remaining (of type () -> float): Estimation of remaining time in the current track.
reset_last_metadata_on_track (of type (() -> bool).{set : (bool) -> unit}): If true, the source's last_metadata is reset on each new track. If a metadata is present along with the track mark, then it becomes the new last_metadata, otherwise, last_metadata becomes null`.
seek (of type (float) -> float): Seek forward, in seconds (returns the amount of time effectively seeked).
self_sync (of type () -> bool): Is the source currently controlling its own real-time loop.
skip (of type () -> unit): Skip to the next track.
time (of type () -> float): Get a source's time, based on its assigned clock.

blank​

debug.is_ready​

input​

input.alsa​

input.external.avi​

input.external.rawaudio​

input.external.rawvideo​

input.external.wav​

input.ffmpeg​

input.harbor​

input.hls​

input.hls.native​

input.http​

input.jack​

input.keyboard.sdl​

input.oss​

input.portaudio​

input.pulseaudio​

input.rtmp​

input.srt​

input.v4l2​

native.request.dynamic​

noise​

playlist​

playlist.list​

request.dynamic​

request.once​

request.single​

saw​

sine​

single​

source​

source.fail​

source.fail.init​

square​

video.testsrc​

`blank`

`debug.is_ready`

`input`

`input.alsa`

`input.external.avi`

`input.external.rawaudio`

`input.external.rawvideo`

`input.external.wav`

`input.ffmpeg`

`input.harbor`

`input.hls`

`input.hls.native`

`input.http`

`input.jack`

`input.keyboard.sdl`

`input.oss`

`input.portaudio`

`input.pulseaudio`

`input.rtmp`

`input.srt`

`input.v4l2`

`native.request.dynamic`

`noise`

`playlist`

`playlist.list`

`request.dynamic`

`request.once`

`request.single`

`saw`

`sine`

`single`

`source`

`source.fail`

`source.fail.init`

`square`

`video.testsrc`