rem: AudioBufferSize(int32 channel_count, uint32 sample_format, float frame_rate, bigtime_t buffer_duration = 50000 )
add: AudioBufferSize(const media_raw_audio_format &raf, bigtime_t buffer_duration = 50000 )
context: AudioBufferSize(int32 channel_count, uint32 sample_format, float frame_rate, bigtime_t buffer_duration = 50000 /* 50 ms */){	return (sample_format & 0xf) * channel_count * (size_t)((frame_rate * buffer_duration) / 1000000.0);}