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ucm: extend snd_use_case_mgr_open() to address the sound card directly

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Some clients like pulseaudio wants to access the multiple instances
of sound cards. This patch adds prefixes like "hw:" to the card_name
argument to handle this. The card index (value) or card identification
(string) can be used for this prefix.

Also the prefix "strict:" was added to avoid the driver name and
driver long name matching. It might be useable for use case
configurations which are not bound to the one sound card.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2019-11-03 19:05:54 +01:00
parent aba2260ae7
commit be6deb927f
2 changed files with 98 additions and 47 deletions
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19
include/use-case.h
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@ -371,8 +371,25 @@ int snd_use_case_set(snd_use_case_mgr_t *uc_mgr,
* \param uc_mgr Returned use case manager pointer
* \param card_name Sound card name.
* \return zero if success, otherwise a negative error code
*
* By default only first card is used when the driver card
* name or long name is passed in the card_name argument.
*
* The "strict:" prefix in the card_name defines that
* there is no driver name / long name matching. The straight
* configuration is used.
*
* The "hw:" prefix in the card_name will load the configuration
* for the ALSA card specified by the card index (value) or
* the card string identificator.
*
* The sound card might be also composed from several physical
* sound cards (for the default and strict card_name).
* The application cannot expect that the device names will refer
* only one ALSA sound card in this case.
*/
int snd_use_case_mgr_open(snd_use_case_mgr_t **uc_mgr, const char *card_name);
int snd_use_case_mgr_open(snd_use_case_mgr_t **uc_mgr,
const char *card_name);
/**