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unify ALSA mixer initialization

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This commit is contained in:
Lennart Poettering 2009-02-14 00:21:36 +01:00
parent 023998e3c8
commit 6790c03f91
4 changed files with 83 additions and 74 deletions
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80
src/modules/alsa/alsa-util.c
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@ -1057,6 +1057,86 @@ success:
return elem;
}
int pa_alsa_find_mixer_and_elem(
snd_pcm_t *pcm,
snd_mixer_t **_m,
snd_mixer_elem_t **_e) {
int err;
snd_mixer_t *m;
snd_mixer_elem_t *e;
pa_bool_t found = FALSE;
const char *dev;
pa_assert(pcm);
pa_assert(_m);
pa_assert(_e);
if ((err = snd_mixer_open(&m, 0)) < 0) {
pa_log("Error opening mixer: %s", snd_strerror(err));
return -1;
}
/* First, try by name */
if ((dev = snd_pcm_name(pcm)))
if (pa_alsa_prepare_mixer(m, dev) >= 0)
found = TRUE;
/* Then, try by card index */
if (!found) {
snd_pcm_info_t* info;
snd_pcm_info_alloca(&info);
if (snd_pcm_info(pcm, info) >= 0) {
char *md;
int card_idx;
if ((card_idx = snd_pcm_info_get_card(info)) >= 0) {
md = pa_sprintf_malloc("hw:%i", card_idx);
if (!dev || !pa_streq(dev, md))
if (pa_alsa_prepare_mixer(m, md) >= 0)
found = TRUE;
pa_xfree(md);
}
}
}
if (!found) {
snd_mixer_close(m);
return -1;
}
switch (snd_pcm_stream(pcm)) {
case SND_PCM_STREAM_PLAYBACK:
e = pa_alsa_find_elem(m, "Master", "PCM", TRUE);
break;
case SND_PCM_STREAM_CAPTURE:
e = pa_alsa_find_elem(m, "Capture", "Mic", FALSE);
break;
default:
pa_assert_not_reached();
}
if (!e) {
snd_mixer_close(m);
return -1;
}
pa_assert(e && m);
*_m = m;
*_e = e;
return 0;
}
static const snd_mixer_selem_channel_id_t alsa_channel_ids[PA_CHANNEL_POSITION_MAX] = {
[PA_CHANNEL_POSITION_MONO] = SND_MIXER_SCHN_MONO, /* The ALSA name is just an alias! */