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| author | Jaroslav Kysela <perex@perex.cz> | 2021-06-02 11:09:43 +0200 |
|---|---|---|
| committer | Jaroslav Kysela <perex@perex.cz> | 2021-06-02 11:09:46 +0200 |
| commit | 0e4ba2ea8c0402f12a645032a14693eb9b1278e6 (patch) | |
| tree | 2af8c8a94f28e2c05d5b6c5c49eede119fef9b5a | |
| parent | ddfc32abf5697de1618b9e7ffdf57a0f97013090 (diff) | |
| download | alsa-lib-0e4ba2ea8c0402f12a645032a14693eb9b1278e6.tar.gz | |
ucm: add _alibpref to get the private device prefix
It may be useful to get the device prefix for the local configuration.
Link: https://gitlab.freedesktop.org/pipewire/pipewire/-/issues/1251
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
| -rw-r--r-- | include/use-case.h | 1 | ||||
| -rw-r--r-- | src/ucm/main.c | 21 |
2 files changed, 22 insertions, 0 deletions
diff --git a/include/use-case.h b/include/use-case.h index ec1a97b0..7890358b 100644 --- a/include/use-case.h +++ b/include/use-case.h @@ -258,6 +258,7 @@ int snd_use_case_get_list(snd_use_case_mgr_t *uc_mgr, * - _verb - return current verb * - _file - return configuration file loaded for current card * - _alibcfg - return private alsa-lib's configuration for current card + * - _alibpref - return private alsa-lib's configuration device prefix for current card * * - [=]{NAME}[/[{modifier}|{/device}][/{verb}]] * - value identifier {NAME} diff --git a/src/ucm/main.c b/src/ucm/main.c index 361952f6..3c9ea15d 100644 --- a/src/ucm/main.c +++ b/src/ucm/main.c @@ -2139,6 +2139,25 @@ static int get_alibcfg(snd_use_case_mgr_t *uc_mgr, char **str) } /** + * \brief Get device prefix for private alsa-lib configuration + * \param uc_mgr Use case manager + * \param str Returned value string + * \return Zero on success (value is filled), otherwise a negative error code + */ +static int get_alibpref(snd_use_case_mgr_t *uc_mgr, char **str) +{ + const size_t l = 9; + char *s; + + s = malloc(l); + if (s == NULL) + return -ENOMEM; + snprintf(s, l, "_ucm%04X", uc_mgr->ucm_card_number); + *str = s; + return 0; +} + +/** * \brief Get current - string * \param uc_mgr Use case manager * \param identifier @@ -2193,6 +2212,8 @@ int snd_use_case_get(snd_use_case_mgr_t *uc_mgr, } else if (strcmp(identifier, "_alibcfg") == 0) { err = get_alibcfg(uc_mgr, (char **)value); + } else if (strcmp(identifier, "_alibpref") == 0) { + err = get_alibpref(uc_mgr, (char **)value); } else if (identifier[0] == '_') { err = -ENOENT; } else { |