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ao_alsa: implement device listing & selection

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Unfortunately, ALSA is particularly bad with this, because mpv has to
add all sorts of magic crap to the device name to make things work. The
device selection overrides this, so explicitly selecting devices will
most likely break your audio. This has yet to be solved.
This commit is contained in:
wm4 2014-10-09 21:22:44 +02:00
parent 35649a990a
commit f1efd83ef7
1 changed files with 27 additions and 0 deletions
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27
audio/out/ao_alsa.c
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@ -365,6 +365,8 @@ static int init(struct ao *ao)
device = talloc_asprintf(ao, "plug:%s", device);
}
}
if (ao->device)
device = ao->device;
if (p->cfg_device && p->cfg_device[0])
device = p->cfg_device;
@ -731,6 +733,30 @@ alsa_error:
return -1;
}
static void list_devs(const struct ao_driver *d, struct ao_device_list *list)
{
void **hints;
if (snd_device_name_hint(-1, "pcm", &hints) < 0)
return;
for (int n = 0; hints[n]; n++) {
char *name = snd_device_name_get_hint(hints[n], "NAME");
char *desc = snd_device_name_get_hint(hints[n], "DESC");
char *io = snd_device_name_get_hint(hints[n], "IOID");
if (io && strcmp(io, "Output") != 0)
continue;
char desc2[1024];
snprintf(desc2, sizeof(desc2), "%s", desc ? desc : "");
for (int i = 0; desc2[i]; i++) {
if (desc2[i] == '\n')
desc2[i] = '/';
}
ao_device_list_add(list, d, &(struct ao_device_desc){name, desc2});
}
snd_device_name_free_hint(hints);
}
#define OPT_BASE_STRUCT struct priv
const struct ao_driver audio_out_alsa = {
@ -748,6 +774,7 @@ const struct ao_driver audio_out_alsa = {
.drain = drain,
.wait = audio_wait,
.wakeup = ao_wakeup_poll,
.list_devs = list_devs,
.priv_size = sizeof(struct priv),
.priv_defaults = &(const struct priv) {
.cfg_block = 1,