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105 lines
4.4 KiB
XML
105 lines
4.4 KiB
XML
<?xml version="1.0" encoding="UTF-8" ?>
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<class name="VideoStreamPlayback" inherits="Resource" version="4.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../class.xsd">
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<brief_description>
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Internal class used by [VideoStream] to manage playback state when played from a [VideoStreamPlayer].
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</brief_description>
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<description>
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This class is intended to be overridden by video decoder extensions with custom implementations of [VideoStream].
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</description>
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<tutorials>
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</tutorials>
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<methods>
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<method name="_get_channels" qualifiers="virtual const">
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<return type="int" />
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<description>
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Returns the number of audio channels.
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</description>
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</method>
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<method name="_get_length" qualifiers="virtual const">
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<return type="float" />
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<description>
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Returns the video duration in seconds, if known, or 0 if unknown.
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</description>
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</method>
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<method name="_get_mix_rate" qualifiers="virtual const">
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<return type="int" />
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<description>
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Returns the audio sample rate used for mixing.
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</description>
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</method>
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<method name="_get_playback_position" qualifiers="virtual const">
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<return type="float" />
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<description>
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Return the current playback timestamp. Called in response to the [member VideoStreamPlayer.stream_position] getter.
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</description>
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</method>
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<method name="_get_texture" qualifiers="virtual const">
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<return type="Texture2D" />
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<description>
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Allocates a [Texture2D] in which decoded video frames will be drawn.
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</description>
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</method>
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<method name="_is_paused" qualifiers="virtual const">
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<return type="bool" />
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<description>
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Returns the paused status, as set by [method _set_paused].
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</description>
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</method>
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<method name="_is_playing" qualifiers="virtual const">
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<return type="bool" />
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<description>
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Returns the playback state, as determined by calls to [method _play] and [method _stop].
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</description>
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</method>
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<method name="_play" qualifiers="virtual">
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<return type="void" />
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<description>
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Called in response to [member VideoStreamPlayer.autoplay] or [method VideoStreamPlayer.play]. Note that manual playback may also invoke [method _stop] multiple times before this method is called. [method _is_playing] should return true once playing.
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</description>
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</method>
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<method name="_seek" qualifiers="virtual">
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<return type="void" />
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<param index="0" name="time" type="float" />
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<description>
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Seeks to [code]time[/code] seconds. Called in response to the [member VideoStreamPlayer.stream_position] setter.
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</description>
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</method>
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<method name="_set_audio_track" qualifiers="virtual">
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<return type="void" />
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<param index="0" name="idx" type="int" />
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<description>
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Select the audio track [code]idx[/code]. Called when playback starts, and in response to the [member VideoStreamPlayer.audio_track] setter.
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</description>
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</method>
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<method name="_set_paused" qualifiers="virtual">
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<return type="void" />
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<param index="0" name="paused" type="bool" />
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<description>
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Set the paused status of video playback. [method _is_paused] must return [code]paused[/code]. Called in response to the [member VideoStreamPlayer.paused] setter.
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</description>
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</method>
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<method name="_stop" qualifiers="virtual">
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<return type="void" />
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<description>
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Stops playback. May be called multiple times before [method _play], or in response to [method VideoStreamPlayer.stop]. [method _is_playing] should return false once stopped.
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</description>
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</method>
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<method name="_update" qualifiers="virtual">
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<return type="void" />
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<param index="0" name="delta" type="float" />
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<description>
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Ticks video playback for [code]delta[/code] seconds. Called every frame as long as [method _is_paused] and [method _is_playing] return true.
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</description>
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</method>
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<method name="mix_audio">
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<return type="int" />
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<param index="0" name="num_frames" type="int" />
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<param index="1" name="buffer" type="PackedFloat32Array" default="PackedFloat32Array()" />
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<param index="2" name="offset" type="int" default="0" />
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<description>
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Render [code]num_frames[/code] audio frames (of [method _get_channels] floats each) from [code]buffer[/code], starting from index [code]offset[/code] in the array. Returns the number of audio frames rendered, or -1 on error.
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</description>
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</method>
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</methods>
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</class>
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