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authorJaroslav Kysela <perex@perex.cz>2009-05-28 12:31:56 +0200
committerTakashi Iwai <tiwai@suse.de>2009-05-29 11:47:40 +0200
commita4444da31ec92f89cd6923579c20a9c240439cfc (patch)
treec379a1cd9f0cc1ecc64f7c60a17e76096310cfce /sound/core
parent13f040f9e55d41e92e485389123654971e03b819 (diff)
ALSA: PCM midlevel: lower jiffies check margin using runtime->delay value
When hardware has large FIFO, it is necessary to lower jiffies margin by count of queued samples. 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.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 0f299a5ad6d..dd9126b92c1 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -263,6 +263,9 @@ static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
goto no_jiffies_check;
hdelta = new_hw_ptr - old_hw_ptr;
+ if (hdelta < runtime->delay)
+ goto no_jiffies_check;
+ hdelta -= runtime->delay;
jdelta = jiffies - runtime->hw_ptr_jiffies;
if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
delta = jdelta /
@@ -349,8 +352,12 @@ int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
new_hw_ptr = hw_base + pos;
}
/* Do jiffies check only in xrun_debug mode */
- if (xrun_debug(substream, 4) &&
- ((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
+ if (!xrun_debug(substream, 4))
+ goto no_jiffies_check;
+ if (delta < runtime->delay)
+ goto no_jiffies_check;
+ delta -= runtime->delay;
+ if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
hw_ptr_error(substream,
"hw_ptr skipping! "
"(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
@@ -359,6 +366,7 @@ int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
((delta * HZ) / runtime->rate));
return 0;
}
+ no_jiffies_check:
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
runtime->silence_size > 0)
snd_pcm_playback_silence(substream, new_hw_ptr);