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| author | Dylan Reid <dgreid@chromium.org> | 2013-04-15 11:57:05 -0700 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2013-04-16 07:15:31 +0200 |
| commit | ae03bbb8f93b9e2c85a58e7476b87f7fb1c063ab (patch) | |
| tree | 47f4d7dcf31343bbd03c10606da3728da0dad37f /sound/pci | |
| parent | ad2109d7d258a92fa016f1f36b423bfcc69f7efc (diff) | |
| download | linux-ae03bbb8f93b9e2c85a58e7476b87f7fb1c063ab.tar.gz linux-ae03bbb8f93b9e2c85a58e7476b87f7fb1c063ab.tar.bz2 linux-ae03bbb8f93b9e2c85a58e7476b87f7fb1c063ab.zip | |
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>
Diffstat (limited to 'sound/pci')
| -rw-r--r-- | sound/pci/hda/hda_intel.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 63734b531f36..7b213d589ef6 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -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); |