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alsa-util/sink/source: Add infrastructure for supported sample formats

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There has been a function to get supported sample rates from alsa and
an array for it in userdata of each module-alsa-sink/source. Similarly,
this patch adds a function to get supported sample formats(bit depth)
from alsa and an array for it to each userdata of the modules.

Signed-off-by: Sangchul Lee <sc11.lee@samsung.com>
This commit is contained in:
Sangchul Lee 2018-06-29 04:57:01 +09:00 • committed by Tanu Kaskinen
parent 7c066fd886
commit 9d7055004e
4 changed files with 99 additions and 0 deletions
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78
src/modules/alsa/alsa-util.c
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@ -1430,6 +1430,84 @@ unsigned int *pa_alsa_get_supported_rates(snd_pcm_t *pcm, unsigned int fallback_
return rates;
}
pa_sample_format_t *pa_alsa_get_supported_formats(snd_pcm_t *pcm, pa_sample_format_t fallback_format) {
static const snd_pcm_format_t format_trans_to_pa[] = {
[SND_PCM_FORMAT_U8] = PA_SAMPLE_U8,
[SND_PCM_FORMAT_A_LAW] = PA_SAMPLE_ALAW,
[SND_PCM_FORMAT_MU_LAW] = PA_SAMPLE_ULAW,
[SND_PCM_FORMAT_S16_LE] = PA_SAMPLE_S16LE,
[SND_PCM_FORMAT_S16_BE] = PA_SAMPLE_S16BE,
[SND_PCM_FORMAT_FLOAT_LE] = PA_SAMPLE_FLOAT32LE,
[SND_PCM_FORMAT_FLOAT_BE] = PA_SAMPLE_FLOAT32BE,
[SND_PCM_FORMAT_S32_LE] = PA_SAMPLE_S32LE,
[SND_PCM_FORMAT_S32_BE] = PA_SAMPLE_S32BE,
[SND_PCM_FORMAT_S24_3LE] = PA_SAMPLE_S24LE,
[SND_PCM_FORMAT_S24_3BE] = PA_SAMPLE_S24BE,
[SND_PCM_FORMAT_S24_LE] = PA_SAMPLE_S24_32LE,
[SND_PCM_FORMAT_S24_BE] = PA_SAMPLE_S24_32BE,
};
static const snd_pcm_format_t all_formats[] = {
SND_PCM_FORMAT_U8,
SND_PCM_FORMAT_A_LAW,
SND_PCM_FORMAT_MU_LAW,
SND_PCM_FORMAT_S16_LE,
SND_PCM_FORMAT_S16_BE,
SND_PCM_FORMAT_FLOAT_LE,
SND_PCM_FORMAT_FLOAT_BE,
SND_PCM_FORMAT_S32_LE,
SND_PCM_FORMAT_S32_BE,
SND_PCM_FORMAT_S24_3LE,
SND_PCM_FORMAT_S24_3BE,
SND_PCM_FORMAT_S24_LE,
SND_PCM_FORMAT_S24_BE,
};
bool supported[PA_ELEMENTSOF(all_formats)] = {
false,
};
snd_pcm_hw_params_t *hwparams;
unsigned int i, j, n;
pa_sample_format_t *formats = 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_formats); i++) {
if (snd_pcm_hw_params_test_format(pcm, hwparams, all_formats[i]) == 0) {
supported[i] = true;
n++;
}
}
if (n > 0) {
formats = pa_xnew(pa_sample_format_t, n + 1);
for (i = 0, j = 0; i < PA_ELEMENTSOF(all_formats); i++) {
if (supported[i])
formats[j++] = format_trans_to_pa[all_formats[i]];
}
formats[j] = PA_SAMPLE_MAX;
} else {
formats = pa_xnew(pa_sample_format_t, 2);
formats[0] = fallback_format;
if ((ret = snd_pcm_hw_params_set_format(pcm, hwparams, format_trans_to_pa[formats[0]])) < 0) {
pa_log_debug("snd_pcm_hw_params_set_format() failed: %s", pa_alsa_strerror(ret));
pa_xfree(formats);
return NULL;
}
formats[1] = PA_SAMPLE_MAX;
}
return formats;
}
bool pa_alsa_pcm_is_hw(snd_pcm_t *pcm) {
snd_pcm_info_t* info;
snd_pcm_info_alloca(&info);