UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Jaroslav Kysela 2009-05-28 12:31:56 +02:00 committed by Takashi Iwai
parent 13f040f9e5
commit a4444da31e
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
sound/core/pcm_lib.c
View File

@ -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);