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ALSA: PCM midlevel: Do not update hw_ptr_jiffies when hw_ptr is not changed

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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>
This commit is contained in:
Jaroslav Kysela 2009-05-28 11:31:20 +02:00 committed by Takashi Iwai
parent c62a01ad6e
commit 13f040f9e5
1 changed files with 14 additions and 2 deletions
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16
sound/core/pcm_lib.c
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@ -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);
}