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spa: acp: get and emit UCM information for SplitPCM devices

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When api.alsa.split-enable=true for ACP device, instruct UCM to not
use alsa-lib plugins for SplitPCM devices.

Grab the information from UCM for the intended channel remapping, and
add the splitting information to the nodes emitted.

Session manager can then look at that, and load nodes to do the channel
splitting.
This commit is contained in:
Pauli Virtanen 2024-12-07 13:27:09 +02:00
parent 7c7a54dd87
commit dcccfcab7f
12 changed files with 422 additions and 22 deletions
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8
spa/plugins/alsa/acp/compat.h
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@ -414,6 +414,14 @@ static PA_PRINTF_FUNC(1,2) inline char *pa_sprintf_malloc(const char *fmt, ...)
return res;
}
static PA_PRINTF_FUNC(1,0) inline char *pa_vsprintf_malloc(const char *fmt, va_list args)
{
char *res;
if (vasprintf(&res, fmt, args) < 0)
res = NULL;
return res;
}
#define pa_fopen_cloexec(f,m) fopen(f,m"e")
static inline char *pa_path_get_filename(const char *p)