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

[Takashi Iwai]

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