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alsa: Probe sink/source sample rates

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This probes sink and source sample rates and uses this information to
validate rate changes and check incoming passthrough formats.
This commit is contained in:
Arun Raghavan 2011-10-17 22:46:06 +05:30
parent 3555634e6e
commit e67440e220
4 changed files with 107 additions and 5 deletions
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36
src/modules/alsa/alsa-util.c
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@ -1327,6 +1327,42 @@ char *pa_alsa_get_reserve_name(const char *device) {
return pa_sprintf_malloc("Audio%i", i);
}
unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm) {
static unsigned int all_rates[] = { 8000, 11025, 16000, 22050, 32000, 44100, 48000, 88200, 96000, 176400, 192000, 384000 };
pa_bool_t supported[PA_ELEMENTSOF(all_rates)] = { FALSE, };
snd_pcm_hw_params_t *hwparams;
unsigned int i, j, n, *rates = NULL;
int ret;
snd_pcm_hw_params_alloca(&hwparams);
if ((ret = snd_pcm_hw_params_any(pcm, hwparams)) < 0) {
pa_log_debug("snd_pcm_hw_params_any() failed: %s", pa_alsa_strerror(ret));
return NULL;
}
for (i = 0, n = 0; i < PA_ELEMENTSOF(all_rates); i++) {
if (snd_pcm_hw_params_test_rate(pcm, hwparams, all_rates[i], 0) == 0) {
supported[i] = TRUE;
n++;
}
}
if (n == 0)
return NULL;
rates = pa_xnew(unsigned int, n + 1);
for (i = 0, j = 0; i < PA_ELEMENTSOF(all_rates); i++) {
if (supported[i])
rates[j++] = all_rates[i];
}
rates[j] = 0;
return rates;
}
pa_bool_t pa_alsa_pcm_is_hw(snd_pcm_t *pcm) {
snd_pcm_info_t* info;
snd_pcm_info_alloca(&info);