alsa: add option to skip the busy check
Makes the card exposed even if some of the pcms are busy. Fixes #3914
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@ -218,6 +218,10 @@ UNDOCUMENTED
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@PAR@ device-param alsa.use-acp # boolean
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Use \ref device-param__alsa_card_profiles "ALSA Card Profiles" (ACP) for device configuration.
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@PAR@ device-param alsa.udev.expose-busy # boolean
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Expose the ALSA card even if it is busy/in use. Default false. This can be useful when some
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of the PCMs are in use by other applications but the other free PCMs should still be exposed.
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## Device properties
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@PAR@ device-param api.alsa.path # string
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@ -93,6 +93,7 @@ struct impl {
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struct spa_source source;
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struct spa_source notify;
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unsigned int use_acp:1;
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unsigned int expose_busy:1;
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};
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static int impl_udev_open(struct impl *this)
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@ -382,6 +383,8 @@ static int check_pcm_device_availability(struct impl *this, struct card *card,
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*/
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res = 0;
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if (this->expose_busy)
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return res;
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spa_scnprintf(path, sizeof(path), "/proc/asound/card%u", card->card_nr);
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@ -1126,6 +1129,8 @@ impl_init(const struct spa_handle_factory *factory,
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if (info) {
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if ((str = spa_dict_lookup(info, "alsa.use-acp")) != NULL)
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this->use_acp = spa_atob(str);
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else if ((str = spa_dict_lookup(info, "alsa.udev.expose-busy")) != NULL)
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this->expose_busy = spa_atob(str);
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}
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return 0;
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