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;
>> This is due to a broken ALSA update patch for the cs46xx code. Apply
>> the included patch which unbreaks the update.
>>
>> David
>>
>>dean . wrote:
This does not seem to be the case. The problems described below are
replicable in 2.5.64-mm8 which has the suggested patch applied.
Luuk
> 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;
>>>This is due to a broken ALSA update patch for the cs46xx code. Apply
>>>the included patch which unbreaks the update.
>>>
>>>David
>>>
>
>>>dean . wrote:
>
>This does not seem to be the case. The problems described below are
>replicable in 2.5.64-mm8 which has the suggested patch applied.
>
>Luuk
>
>
>
>
>>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.
I had the same result here, the patch didnt help the stuttering
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