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Commit ae03bbb8 authored by Dylan Reid's avatar Dylan Reid Committed by Takashi Iwai
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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: default avatarDylan Reid <dgreid@chromium.org>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent ad2109d7

sound/pci/hda/hda_intel.c

+5 −2
Original line number Diff line number Diff line
@@ -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);