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ucm: add LibraryConfig support

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This commit allows to define private alsa-lib's configuration. When
the configuration is present, the device values ("PlaybackCTL",
"CaptureCTL", "PlaybackMixer", "CaptureMixer", "CapturePCM")
are prefixed with '_ucmHEXA.' string where HEXA is replaced by the
unique hexadecimal number identifying the opened ucm manager handle.

    Syntax 4

    LibraryConfig.a_label.SubstiConfig {
            # substituted library configuration like:
            usr_share_dir "${ConfLibDir}"
    }

    LibraryConfig.b_label.Config {
            # non-substituted library configuration like:
            usr_share_dir "/usr/share/alsa"
    }

    The File counterparts:

    LibraryConfig.c_label.SubstiFile "/some/path"
    LibraryConfig.d_label.File "/some/path"

Note that for files the contents is substituted on the request,
but the file name is always substituted (useful for ${ConfDir} etc.).

The private configuration is not saved or preserved. It's life time
belongs to the opened ucm manager handle.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-04-12 18:09:21 +02:00
parent 3e0140088c
commit 8f5779eb3f
11 changed files with 400 additions and 36 deletions
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7
include/local.h
View file

@ -374,4 +374,11 @@ int _snd_config_load_with_include(snd_config_t *config, snd_input_t *in,
void *INTERNAL(snd_dlopen)(const char *name, int mode, char *errbuf, size_t errbuflen);
#endif
const char *uc_mgr_alibcfg_by_device(snd_config_t **config, const char *name);
static inline int _snd_is_ucm_device(const char *name)
{
return name && name[0] == '_' && name[1] == 'u' && name[2] == 'c' && name[3] == 'm';
}
#endif