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option to use ALSA default fragment number and size

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@295 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2004-11-20 22:17:31 +00:00
parent 5f647c8fef
commit acc8b7890a
5 changed files with 41 additions and 23 deletions
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35
polyp/alsa-util.c
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@ -30,8 +30,9 @@
#include "sample.h"
#include "xmalloc.h"
int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, struct pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *buffer_size) {
int ret = 0;
int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, struct pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *period_size) {
int ret = -1;
snd_pcm_uframes_t buffer_size;
snd_pcm_hw_params_t *hwparams = NULL;
static const snd_pcm_format_t format_trans[] = {
[PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
@ -42,21 +43,39 @@ int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, struct pa_sample_spec *ss, uint
[PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
[PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
};
assert(pcm_handle && ss && periods && period_size);
if (snd_pcm_hw_params_malloc(&hwparams) < 0 ||
snd_pcm_hw_params_any(pcm_handle, hwparams) < 0 ||
snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED) < 0 ||
snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[ss->format]) < 0 ||
snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &ss->rate, NULL) < 0 ||
snd_pcm_hw_params_set_channels(pcm_handle, hwparams, ss->channels) < 0 ||
snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, periods, NULL) < 0 ||
snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, buffer_size) < 0 ||
snd_pcm_hw_params(pcm_handle, hwparams) < 0) {
ret = -1;
}
(*periods > 0 && snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams, periods, NULL) < 0) ||
(*period_size > 0 && snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, period_size, NULL) < 0) ||
snd_pcm_hw_params(pcm_handle, hwparams) < 0)
goto finish;
if (snd_pcm_prepare(pcm_handle) < 0)
goto finish;
if (snd_pcm_hw_params_current(pcm_handle, hwparams) < 0)
goto finish;
if (snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size) < 0 ||
snd_pcm_hw_params_get_period_size(hwparams, period_size, NULL) < 0)
goto finish;
assert(buffer_size > 0 && *period_size > 0);
*periods = buffer_size / *period_size;
assert(*periods > 0);
ret = 0;
finish:
if (hwparams)
snd_pcm_hw_params_free(hwparams);
return ret;
}