Add mixer_device configuration file option for ALSA
Support a separate mixer_device configuration file option for advanced ALSA configurations. Previously, ALSA local output happened to work becasue "default" is valid as both a PCM and a mixer. Now you can separately specify the device name for PCM output and mixer operations. In my setup, I am using the following setup: card = "default:CARD=NVidia" mixer = "Front" mixer_device = "hw:CARD=NVidia"
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@ -163,13 +163,17 @@ audio {
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# Type of the output (alsa, pulseaudio or dummy)
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# type = "alsa"
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# Audio device name for local audio output - ALSA only
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# Audio PCM device name for local audio output - ALSA only
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# card = "default"
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# Mixer channel to use for volume control - ALSA only
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# If not set, PCM will be used if available, otherwise Master.
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# mixer = ""
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# Mixer device to use for volume control - ALSA only
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# If not set, the value for "card" will be used.
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# mixer_device = ""
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# Syncronization - ALSA only
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# If your local audio is out of sync with AirPlay, you can adjust this
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# value. Positive values correspond to moving local audio ahead,
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@ -99,6 +99,7 @@ static cfg_opt_t sec_audio[] =
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CFG_STR("type", NULL, CFGF_NONE),
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CFG_STR("card", "default", CFGF_NONE),
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CFG_STR("mixer", NULL, CFGF_NONE),
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CFG_STR("mixer_device", NULL, CFGF_NONE),
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CFG_INT("offset", 0, CFGF_NONE),
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CFG_END()
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};
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@ -49,6 +49,7 @@
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// TODO Unglobalise these and add support for multiple sound cards
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static char *card_name;
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static char *mixer_name;
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static char *mixer_device_name;
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static snd_pcm_t *hdl;
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static snd_mixer_t *mixer_hdl;
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static snd_mixer_elem_t *vol_elem;
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@ -316,7 +317,7 @@ mixer_open(void)
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return -1;
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}
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ret = snd_mixer_attach(mixer_hdl, card_name);
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ret = snd_mixer_attach(mixer_hdl, mixer_device_name);
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if (ret < 0)
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{
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DPRINTF(E_LOG, L_LAUDIO, "Failed to attach mixer: %s\n", snd_strerror(ret));
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@ -989,6 +990,9 @@ alsa_init(void)
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card_name = cfg_getstr(cfg_audio, "card");
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mixer_name = cfg_getstr(cfg_audio, "mixer");
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mixer_device_name = cfg_getstr(cfg_audio, "mixer_device");
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if (mixer_device_name == NULL || strlen(mixer_device_name) == 0)
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mixer_device_name = card_name;
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nickname = cfg_getstr(cfg_audio, "nickname");
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offset = cfg_getint(cfg_audio, "offset");
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if (abs(offset) > 44100)
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