Messages in this thread Patch in this message | | | Subject | Re: ALSA + mmap or OSS emulation + mmap producing stutering sound | From | Luuk van der Duim <> | Date | 17 Mar 2003 13:32:00 +0100 |
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>> 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;
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