Re: [alsa-devel] [PATCH] ALSA: hda - Apply codec delay to wallclock.

At Mon, 08 Apr 2013 11:31:12 -0500, Pierre-Louis Bossart wrote:

...

• if (hinfo->ops.get_delay) {

• codec_nsec =
  

• 	hinfo->ops.get_delay(hinfo, codec, substream) * 1000000;
  

• if (stream == SNDRV_PCM_STREAM_CAPTURE)
  

• 	nsec = (nsec > codec_nsec) ? nsec - codec_nsec : 0;
  

• else if (stream == SNDRV_PCM_STREAM_PLAYBACK)
  

• 	nsec += codec_nsec;
  

Can the .get_delay be modified to provide a better resolution than a ms? If you already convert to time, microseconds would seem like a better fit? Your codec seems to report frames (ie 20.83 us).

Actually the patch must be wrong -- get_delay returns the delay in frame (sample) unit.

Takashi