ALSA: pcm: allow for trigger_tstamp snapshot in .trigger
Don't use generic snapshot of trigger_tstamp if low-level driver or hardware can get a more precise value for better audio/system time synchronization. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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0d59b81435
Коммит
2b79d7a6bf
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@ -285,6 +285,7 @@ struct snd_pcm_runtime {
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/* -- Status -- */
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struct snd_pcm_substream *trigger_master;
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struct timespec trigger_tstamp; /* trigger timestamp */
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bool trigger_tstamp_latched; /* trigger timestamp latched in low-level driver/hardware */
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int overrange;
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snd_pcm_uframes_t avail_max;
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snd_pcm_uframes_t hw_ptr_base; /* Position at buffer restart */
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@ -810,7 +810,8 @@ static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
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if (runtime->trigger_master == NULL)
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return;
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if (runtime->trigger_master == substream) {
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snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
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if (!runtime->trigger_tstamp_latched)
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snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
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} else {
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snd_pcm_trigger_tstamp(runtime->trigger_master);
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runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
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@ -979,6 +980,7 @@ static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
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!snd_pcm_playback_data(substream))
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return -EPIPE;
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runtime->trigger_tstamp_latched = false;
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runtime->trigger_master = substream;
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return 0;
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}
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