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