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243 lines
15 KiB
ReStructuredText
243 lines
15 KiB
ReStructuredText
:github_url: hide
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.. DO NOT EDIT THIS FILE!!!
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.. Generated automatically from Godot engine sources.
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.. Generator: https://github.com/godotengine/godot/tree/master/doc/tools/make_rst.py.
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.. XML source: https://github.com/godotengine/godot/tree/master/doc/classes/VideoStreamPlayback.xml.
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.. _class_VideoStreamPlayback:
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VideoStreamPlayback
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===================
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**继承：** :ref:`Resource<class_Resource>` **<** :ref:`RefCounted<class_RefCounted>` **<** :ref:`Object<class_Object>`
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:ref:`VideoStream<class_VideoStream>` 使用的内部类，用于管理其在 :ref:`VideoStreamPlayer<class_VideoStreamPlayer>` 中的播放状态。
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.. rst-class:: classref-introduction-group
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描述
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----
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该类旨在被具有 :ref:`VideoStream<class_VideoStream>` 自定义实现的视频解码器扩展所覆盖。
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.. rst-class:: classref-reftable-group
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方法
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----
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.. table::
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:widths: auto
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`int<class_int>` | :ref:`_get_channels<class_VideoStreamPlayback_private_method__get_channels>`\ (\ ) |virtual| |const| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`float<class_float>` | :ref:`_get_length<class_VideoStreamPlayback_private_method__get_length>`\ (\ ) |virtual| |const| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`int<class_int>` | :ref:`_get_mix_rate<class_VideoStreamPlayback_private_method__get_mix_rate>`\ (\ ) |virtual| |const| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`float<class_float>` | :ref:`_get_playback_position<class_VideoStreamPlayback_private_method__get_playback_position>`\ (\ ) |virtual| |const| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`Texture2D<class_Texture2D>` | :ref:`_get_texture<class_VideoStreamPlayback_private_method__get_texture>`\ (\ ) |virtual| |const| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`_is_paused<class_VideoStreamPlayback_private_method__is_paused>`\ (\ ) |virtual| |const| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`bool<class_bool>` | :ref:`_is_playing<class_VideoStreamPlayback_private_method__is_playing>`\ (\ ) |virtual| |const| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| |void| | :ref:`_play<class_VideoStreamPlayback_private_method__play>`\ (\ ) |virtual| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| |void| | :ref:`_seek<class_VideoStreamPlayback_private_method__seek>`\ (\ time\: :ref:`float<class_float>`\ ) |virtual| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| |void| | :ref:`_set_audio_track<class_VideoStreamPlayback_private_method__set_audio_track>`\ (\ idx\: :ref:`int<class_int>`\ ) |virtual| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| |void| | :ref:`_set_paused<class_VideoStreamPlayback_private_method__set_paused>`\ (\ paused\: :ref:`bool<class_bool>`\ ) |virtual| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| |void| | :ref:`_stop<class_VideoStreamPlayback_private_method__stop>`\ (\ ) |virtual| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| |void| | :ref:`_update<class_VideoStreamPlayback_private_method__update>`\ (\ delta\: :ref:`float<class_float>`\ ) |virtual| |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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| :ref:`int<class_int>` | :ref:`mix_audio<class_VideoStreamPlayback_method_mix_audio>`\ (\ num_frames\: :ref:`int<class_int>`, buffer\: :ref:`PackedFloat32Array<class_PackedFloat32Array>` = PackedFloat32Array(), offset\: :ref:`int<class_int>` = 0\ ) |
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+-----------------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
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.. rst-class:: classref-section-separator
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----
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.. rst-class:: classref-descriptions-group
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方法说明
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--------
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.. _class_VideoStreamPlayback_private_method__get_channels:
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.. rst-class:: classref-method
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:ref:`int<class_int>` **_get_channels**\ (\ ) |virtual| |const| :ref:`🔗<class_VideoStreamPlayback_private_method__get_channels>`
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返回音频通道的数量。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__get_length:
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.. rst-class:: classref-method
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:ref:`float<class_float>` **_get_length**\ (\ ) |virtual| |const| :ref:`🔗<class_VideoStreamPlayback_private_method__get_length>`
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视频时长已知时返回视频时长，未知时返回 0。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__get_mix_rate:
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.. rst-class:: classref-method
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:ref:`int<class_int>` **_get_mix_rate**\ (\ ) |virtual| |const| :ref:`🔗<class_VideoStreamPlayback_private_method__get_mix_rate>`
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返回用于混音的音频采样率。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__get_playback_position:
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.. rst-class:: classref-method
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:ref:`float<class_float>` **_get_playback_position**\ (\ ) |virtual| |const| :ref:`🔗<class_VideoStreamPlayback_private_method__get_playback_position>`
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返回当前播放时间戳。获取 :ref:`VideoStreamPlayer.stream_position<class_VideoStreamPlayer_property_stream_position>` 时会被调用。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__get_texture:
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.. rst-class:: classref-method
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:ref:`Texture2D<class_Texture2D>` **_get_texture**\ (\ ) |virtual| |const| :ref:`🔗<class_VideoStreamPlayback_private_method__get_texture>`
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分配一个 :ref:`Texture2D<class_Texture2D>`\ ，解码得到的视频帧会在其中绘制。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__is_paused:
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.. rst-class:: classref-method
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:ref:`bool<class_bool>` **_is_paused**\ (\ ) |virtual| |const| :ref:`🔗<class_VideoStreamPlayback_private_method__is_paused>`
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返回暂停状态，由 :ref:`_set_paused<class_VideoStreamPlayback_private_method__set_paused>` 设置。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__is_playing:
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.. rst-class:: classref-method
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:ref:`bool<class_bool>` **_is_playing**\ (\ ) |virtual| |const| :ref:`🔗<class_VideoStreamPlayback_private_method__is_playing>`
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返回由调用 :ref:`_play<class_VideoStreamPlayback_private_method__play>` 和 :ref:`_stop<class_VideoStreamPlayback_private_method__stop>` 决定的播放状态。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__play:
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.. rst-class:: classref-method
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|void| **_play**\ (\ ) |virtual| :ref:`🔗<class_VideoStreamPlayback_private_method__play>`
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:ref:`VideoStreamPlayer.autoplay<class_VideoStreamPlayer_property_autoplay>` 或 :ref:`VideoStreamPlayer.play<class_VideoStreamPlayer_method_play>` 时会被调用。请注意，手动播放在这个方法被调用前也可能多次调用 :ref:`_stop<class_VideoStreamPlayback_private_method__stop>`\ 。开始播放后 :ref:`_is_playing<class_VideoStreamPlayback_private_method__is_playing>` 就应该返回 true。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__seek:
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.. rst-class:: classref-method
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|void| **_seek**\ (\ time\: :ref:`float<class_float>`\ ) |virtual| :ref:`🔗<class_VideoStreamPlayback_private_method__seek>`
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检索至第 ``time`` 秒。设置 :ref:`VideoStreamPlayer.stream_position<class_VideoStreamPlayer_property_stream_position>` 时会被调用。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__set_audio_track:
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.. rst-class:: classref-method
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|void| **_set_audio_track**\ (\ idx\: :ref:`int<class_int>`\ ) |virtual| :ref:`🔗<class_VideoStreamPlayback_private_method__set_audio_track>`
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选择 ``idx`` 音轨。播放开始时，或者设置 :ref:`VideoStreamPlayer.audio_track<class_VideoStreamPlayer_property_audio_track>` 时会被调用。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__set_paused:
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.. rst-class:: classref-method
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|void| **_set_paused**\ (\ paused\: :ref:`bool<class_bool>`\ ) |virtual| :ref:`🔗<class_VideoStreamPlayback_private_method__set_paused>`
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设置视频播放的暂停状态。\ :ref:`_is_paused<class_VideoStreamPlayback_private_method__is_paused>` 必须返回 ``paused``\ 。设置 :ref:`VideoStreamPlayer.paused<class_VideoStreamPlayer_property_paused>` 时会被调用。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__stop:
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.. rst-class:: classref-method
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|void| **_stop**\ (\ ) |virtual| :ref:`🔗<class_VideoStreamPlayback_private_method__stop>`
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停止播放。可能在 :ref:`_play<class_VideoStreamPlayback_private_method__play>` 多次调用，也可能与 :ref:`VideoStreamPlayer.stop<class_VideoStreamPlayer_method_stop>` 对应。停止后 :ref:`_is_playing<class_VideoStreamPlayback_private_method__is_playing>` 应返回 false。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_private_method__update:
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.. rst-class:: classref-method
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|void| **_update**\ (\ delta\: :ref:`float<class_float>`\ ) |virtual| :ref:`🔗<class_VideoStreamPlayback_private_method__update>`
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将视频播放推进 ``delta`` 秒。只要 :ref:`_is_paused<class_VideoStreamPlayback_private_method__is_paused>` 和 :ref:`_is_playing<class_VideoStreamPlayback_private_method__is_playing>` 返回 true，就会为每一帧调用。
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.. rst-class:: classref-item-separator
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----
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.. _class_VideoStreamPlayback_method_mix_audio:
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.. rst-class:: classref-method
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:ref:`int<class_int>` **mix_audio**\ (\ num_frames\: :ref:`int<class_int>`, buffer\: :ref:`PackedFloat32Array<class_PackedFloat32Array>` = PackedFloat32Array(), offset\: :ref:`int<class_int>` = 0\ ) :ref:`🔗<class_VideoStreamPlayback_method_mix_audio>`
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从数组中的索引 ``offset`` 开始，从 ``buffer`` 渲染 ``num_frames`` 个音频帧（每帧 :ref:`_get_channels<class_VideoStreamPlayback_private_method__get_channels>` 个浮点数）。返回渲染的音频帧数，如果出错则返回 -1。
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.. |virtual| replace:: :abbr:`virtual (本方法通常需要用户覆盖才能生效。)`
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.. |const| replace:: :abbr:`const (本方法无副作用，不会修改该实例的任何成员变量。)`
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.. |vararg| replace:: :abbr:`vararg (本方法除了能接受在此处描述的参数外，还能够继续接受任意数量的参数。)`
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.. |constructor| replace:: :abbr:`constructor (本方法用于构造某个类型。)`
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.. |static| replace:: :abbr:`static (调用本方法无需实例，可直接使用类名进行调用。)`
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.. |operator| replace:: :abbr:`operator (本方法描述的是使用本类型作为左操作数的有效运算符。)`
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.. |bitfield| replace:: :abbr:`BitField (这个值是由下列位标志构成位掩码的整数。)`
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.. |void| replace:: :abbr:`void (无返回值。)`
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