VideoStreamPlayback

public VideoStreamPlayback();

Creates a base decoder-state container. Does not decode a file without playback-contract overrides.

public int MixAudio(int numFrames, ReadOnlySpan<float> buffer, int offset);

Sends decoded float samples to the attached player sink. numFrames counts audio frames, buffer interleaves channels, offset indexes float samples. Supply channels × numFrames samples after offset. Returns accepted frames, -1 without a sink/on invalid bounds, or zero for numFrames <= zero. Does not generate sound from an empty array.

public int MixAudio(int numFrames, float[] buffer = null, int offset = 0);

Sends decoded float samples to the attached player sink. numFrames counts audio frames, buffer interleaves channels, offset indexes float samples. Supply channels × numFrames samples after offset. Returns accepted frames, -1 without a sink/on invalid bounds, or zero for numFrames <= zero. Does not generate sound from an empty array.

public virtual int _GetChannels();

Return actual interleaved audio channel count; zero means no audio. Match the MixAudio buffer layout.

public virtual double _GetLength();

Return duration in seconds; zero may indicate unknown duration. Not milliseconds or frame count.

public virtual int _GetMixRate();

Return decoded audio sample rate in Hz, such as 48000. Not the number of samples in the current block.

public virtual double _GetPlaybackPosition();

Return the current position in seconds using a consistent audio/video timeline.

public virtual Texture2D _GetTexture();

Return the decoded frame’s current Texture2D. A stable updated resource avoids continually creating textures; null means no texture.

public virtual bool _IsPaused();

Return your implementation’s stored pause state.

public virtual bool _IsPlaying();

Return actual playback state. Return false after natural completion so VideoStreamPlayer can handle Loop/Finished. Do not conflate pausing with movie completion.

public virtual void _Play();

Implement starting your playback. Define/document repeated-start behavior; the base C# method is empty.

public virtual void _Seek(double time);

Implement seeking to time in seconds, validating bounds and restoring decoder state. The base method cannot seek.

public virtual void _SetAudioTrack(int idx);

Handle the audio-track index according to your format. Neither a bus index nor a channel count.

public virtual void _SetPaused(bool paused);

Store pause state and suspend decoder advancement without losing required state.

public virtual void _Stop();

Implement stopping and cleaning up the decoder. Your implementation defines position reset, not the empty base C# method.

public virtual void _Update(double delta);

Advance decoding by delta seconds and update frame/audio data. The player already applies time scaling; do not multiply again without a reason. Invocation count is not a fixed frame rate.