rem: return (sample_format & 0xf) * channel_count * (size_t)((frame_rate * buffer_duration) / 1000000.0);
add: return (raf.format & 0xf) * (raf.channel_count) * (size_t)((raf.frame_rate * buffer_duration) / 1000000.0);
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);}