10 Apr
2013
10 Apr
'13
5:16 p.m.
At Wed, 10 Apr 2013 07:29:32 -0700, Pierre-Louis Bossart wrote:
return (nsec > codec_nsecs) ? nsec - codec_nsecs : 0;Is this correct? I would think for capture you need to add the delay, and subtract it for playback?
Should the capture timestamp represents the wall time when the sample is converted by the A-to-D? If so, would be the correct time be the codec delay nsec before what is reported here?
For playback audio_timestamp = wallclk - codec_delay_in_nsec for capture audio_timestamp = wallclk + codec_delay_in_nsec
Hmm... I'm confused, too. From a pretty generic view,
- hwptr = the samples (frames) transferred on the (memory) buffer - hwptr + PCM delay = the point being currently captured
Which position does the wall clock correspond?
Takashi