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ALSA: hda - Add codec delay to the capture time stamp. 

For capture, the delay through the codec contributes to the time stamp
of the sample recorded at the A to D.  Rename the codec time stamp
function appropriately.

Signed-off-by: Dylan Reid <dgreid@chromium.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Dylan Reid 2013-04-15 11:57:05 -07:00 committed by Takashi Iwai
parent ad2109d7d2
commit ae03bbb8f9
1 changed files with 5 additions and 2 deletions
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7
sound/pci/hda/hda_intel.c
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@ -1889,7 +1889,7 @@ static void azx_timecounter_init(struct snd_pcm_substream *substream,
tc->cycle_last = last;
}
static u64 azx_subtract_codec_delay(struct snd_pcm_substream *substream,
static u64 azx_adjust_codec_delay(struct snd_pcm_substream *substream,
u64 nsec)
{
struct azx_pcm *apcm = snd_pcm_substream_chip(substream);
@ -1903,6 +1903,9 @@ static u64 azx_subtract_codec_delay(struct snd_pcm_substream *substream,
codec_nsecs = div_u64(codec_frames * 1000000000LL,
substream->runtime->rate);
if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
return nsec + codec_nsecs;
return (nsec > codec_nsecs) ? nsec - codec_nsecs : 0;
}
@ -1914,7 +1917,7 @@ static int azx_get_wallclock_tstamp(struct snd_pcm_substream *substream,
nsec = timecounter_read(&azx_dev->azx_tc);
nsec = div_u64(nsec, 3); /* can be optimized */
nsec = azx_subtract_codec_delay(substream, nsec);
nsec = azx_adjust_codec_delay(substream, nsec);
*ts = ns_to_timespec(nsec);