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SubjectRe: ALSA + mmap or OSS emulation + mmap producing stutering sound
This is due to a broken ALSA update patch for the cs46xx code.  Apply 
the included patch which unbreaks the update.

David

dean . wrote:

> Kernel versions 2.5.61-64 (Havnt tried 60) produce stuttering sound
> when using alsa and mmap (xmms alsa output plugin) or oss emu and mmap
> (quake3?) produce stuttering sound happening after around the first
> half second of playing. This is with the kernels alsa cs46xx module
> and a Turtle beach Santa Cruz soundcard. Works fine with 2.5.59 though.

diff -Nru a/sound/pci/cs46xx/cs46xx_lib.c b/sound/pci/cs46xx/cs46xx_lib.c
--- a/sound/pci/cs46xx/cs46xx_lib.c Mon Feb 17 14:57:26 2003
+++ b/sound/pci/cs46xx/cs46xx_lib.c Mon Feb 17 14:57:26 2003
@@ -677,6 +677,7 @@
{
/* cs46xx_t *chip = snd_pcm_substream_chip(substream); */
snd_pcm_runtime_t *runtime = substream->runtime;
+ snd_pcm_uframes_t appl_ptr = runtime->control->appl_ptr;
snd_pcm_sframes_t diff;
cs46xx_pcm_t * cpcm;
int buffer_size;
@@ -685,14 +686,14 @@

buffer_size = runtime->period_size * CS46XX_FRAGS << cpcm->shift;

- diff = runtime->control->appl_ptr - cpcm->appl_ptr;
+ diff = appl_ptr - cpcm->appl_ptr;
if (diff) {
if (diff < -(snd_pcm_sframes_t) (runtime->boundary / 2))
diff += runtime->boundary;
- cpcm->sw_ready += diff << cpcm->shift;
+ frames += diff;
}
cpcm->sw_ready += frames << cpcm->shift;
- cpcm->appl_ptr = runtime->control->appl_ptr + frames;
+ cpcm->appl_ptr = appl_ptr + frames;
while (cpcm->hw_ready < buffer_size &&
cpcm->sw_ready > 0) {
size_t hw_to_end = buffer_size - cpcm->hw_data;
@@ -724,15 +725,16 @@
{
cs46xx_t *chip = snd_pcm_substream_chip(substream);
snd_pcm_runtime_t *runtime = substream->runtime;
- snd_pcm_sframes_t diff = runtime->control->appl_ptr - chip->capt.appl_ptr;
+ snd_pcm_uframes_t appl_ptr = runtime->control->appl_ptr;
+ snd_pcm_sframes_t diff = appl_ptr - chip->capt.appl_ptr;
int buffer_size = runtime->period_size * CS46XX_FRAGS << chip->capt.shift;
if (diff) {
if (diff < -(snd_pcm_sframes_t) (runtime->boundary / 2))
diff += runtime->boundary;
- chip->capt.sw_ready -= diff << chip->capt.shift;
+ frames += diff;
}
chip->capt.sw_ready -= frames << chip->capt.shift;
- chip->capt.appl_ptr = runtime->control->appl_ptr + frames;
+ chip->capt.appl_ptr = appl_ptr + frames;
while (chip->capt.hw_ready > 0 &&
chip->capt.sw_ready < (int)chip->capt.sw_bufsize) {
size_t hw_to_end = buffer_size - chip->capt.hw_data;
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