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ao_alsa: fix setting mono channel map 

When setting the ALSA channel map, we never actually set the map we got
from ALSA directly, but convert it to mpv's, and then back to ALSA's.
mpv and ALSA use different conventions for mono, and there is already an
exception for ALSA->mpv, but not mpv->ALSA.
This commit is contained in:
wm4 2014-12-20 17:18:50 +01:00
parent 0dc455eb16
commit a69f168dff
1 changed files with 5 additions and 0 deletions
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5
audio/out/ao_alsa.c
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@ -538,6 +538,10 @@ static int init_device(struct ao *ao)
for (int c = 0; c < dev_chmap.num; c++)
alsa_chmap->pos[c] = find_alsa_channel(dev_chmap.speaker[c]);
// mpv and ALSA use different conventions for mono
if (dev_chmap.num == 1 && dev_chmap.speaker[0] == MP_SP(FC))
alsa_chmap->pos[0] = SND_CHMAP_MONO;
char tmp[128];
if (snd_pcm_chmap_print(alsa_chmap, sizeof(tmp), tmp) > 0)
MP_VERBOSE(ao, "trying to set ALSA channel map: %s\n", tmp);
@ -603,6 +607,7 @@ static int init_device(struct ao *ao)
MP_WARN(ao, "Got unknown channel map from ALSA.\n");
}
// mpv and ALSA use different conventions for mono
if (ao->channels.num == 1)
ao->channels.speaker[0] = MP_SP(FC);