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* if an ALSA device doesn't support the channel count requested, use what ALSA suggests instead

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* if an ALSA device doesn't support the sampling freq requested, use what ALSA suggests and resample if this deviates more than 10% from what we requested
* fix segfault freeing an unitialized mixer_fdl field


git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@992 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2006-05-30 22:05:07 +00:00
parent 821a49b967
commit bb820db4b5
4 changed files with 36 additions and 11 deletions
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17
src/modules/alsa-util.c
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@ -249,11 +249,12 @@ int pa_alsa_fdlist_init_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_han
/* Set the hardware parameters of the given ALSA device. Returns the
* selected fragment settings in *period and *period_size */
int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, const pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *period_size) {
int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, 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;
unsigned int r = ss->rate;
unsigned int c = ss->channels;
static const snd_pcm_format_t format_trans[] = {
[PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
@ -273,14 +274,24 @@ int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, const pa_sample_spec *ss, uint3
(ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0 ||
(ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[ss->format])) < 0 ||
(ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &r, NULL)) < 0 ||
(ret = snd_pcm_hw_params_set_channels(pcm_handle, hwparams, ss->channels)) < 0 ||
(ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0 ||
(*period_size > 0 && (ret = snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, period_size, NULL)) < 0) ||
(*periods > 0 && (ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0) ||
(ret = snd_pcm_hw_params(pcm_handle, hwparams)) < 0)
goto finish;
if (ss->rate != r)
if (ss->rate != r) {
pa_log_info(__FILE__": device doesn't support %u Hz, changed to %u Hz.", ss->rate, r);
/* If the sample rate deviates too much, we need to resample */
if (r < ss->rate*.9 || r > ss->rate*1.1)
ss->rate = r;
}
if (ss->channels != c) {
pa_log_info(__FILE__": device doesn't support %u channels, changed to %u.", ss->channels, c);
ss->channels = c;
}
if ((ret = snd_pcm_prepare(pcm_handle)) < 0)
goto finish;