| vp | 扩展方法的“this”指针。 |
| trackIndex | 查询采样提供者的音频轨道索引。 |
AudioSampleProvider 指定轨道的采样提供者。
返回指定轨道的AudioSampleProvider，用于在播放期间接收音频采样。
只有在VideoPlayer.audioOutputMode 设置为 VideoAudioOutputMode.APIOnly 时，才能获得采样提供者。
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