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| author | Jaroslav Kysela <perex@perex.cz> | 2009-05-28 11:31:20 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2009-05-29 11:47:38 +0200 |
| commit | 13f040f9e55d41e92e485389123654971e03b819 (patch) | |
| tree | a1a10bff0ab5fb7f8ab265edba72897f1b90bd07 /sound/core | |
| parent | c62a01ad6e746fae9c93f51ea67e0abfd8d94b58 (diff) | |
| download | linux-13f040f9e55d41e92e485389123654971e03b819.tar.gz | |
ALSA: PCM midlevel: Do not update hw_ptr_jiffies when hw_ptr is not changed
Some hardware might have bigger FIFOs and DMA pointer value will be updated in large chunks. Do not update hw_ptr_jiffies and position timestamp when hw_ptr value was not changed. Signed-off-by: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/pcm_lib.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c index 25cb36710ef4..0f299a5ad6da 100644 --- a/sound/core/pcm_lib.c +++ b/sound/core/pcm_lib.c @@ -138,6 +138,10 @@ void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_ufram static void xrun(struct snd_pcm_substream *substream) { + struct snd_pcm_runtime *runtime = substream->runtime; + + if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) + snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); if (xrun_debug(substream, 1)) { snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n", @@ -154,8 +158,6 @@ snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream, { snd_pcm_uframes_t pos; - if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) - snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); pos = substream->ops->pointer(substream); if (pos == SNDRV_PCM_POS_XRUN) return pos; /* XRUN */ @@ -298,10 +300,15 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream) runtime->silence_size > 0) snd_pcm_playback_silence(substream, new_hw_ptr); + if (runtime->status->hw_ptr == new_hw_ptr) + return 0; + runtime->hw_ptr_base = hw_base; runtime->status->hw_ptr = new_hw_ptr; runtime->hw_ptr_jiffies = jiffies; runtime->hw_ptr_interrupt = hw_ptr_interrupt; + if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) + snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); return snd_pcm_update_hw_ptr_post(substream, runtime); } @@ -356,9 +363,14 @@ int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream) runtime->silence_size > 0) snd_pcm_playback_silence(substream, new_hw_ptr); + if (runtime->status->hw_ptr != new_hw_ptr) + return 0; + runtime->hw_ptr_base = hw_base; runtime->status->hw_ptr = new_hw_ptr; runtime->hw_ptr_jiffies = jiffies; + if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) + snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); return snd_pcm_update_hw_ptr_post(substream, runtime); } |