1 files changed, 65 insertions, 0 deletions
diff --git a/source/l/alsa-lib/0e4ba2ea8c0402f12a645032a14693eb9b1278e6.patch b/source/l/alsa-lib/0e4ba2ea8c0402f12a645032a14693eb9b1278e6.patch
new file mode 100644
index 000000000..3703f8096
--- /dev/null
+++ b/source/l/alsa-lib/0e4ba2ea8c0402f12a645032a14693eb9b1278e6.patch
@@ -0,0 +1,65 @@
+From 0e4ba2ea8c0402f12a645032a14693eb9b1278e6 Mon Sep 17 00:00:00 2001
+From: Jaroslav Kysela <perex@perex.cz>
+Date: Wed, 2 Jun 2021 11:09:43 +0200
+Subject: [PATCH] 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>
+---
+ include/use-case.h |  1 +
+ src/ucm/main.c     | 21 +++++++++++++++++++++
+ 2 files changed, 22 insertions(+)
+
+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
+@@ -2138,6 +2138,25 @@ static int get_alibcfg(snd_use_case_mgr_t *uc_mgr, char **str)
+ 	return 0;
+ }
+ 
++/**
++ * \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
+@@ -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 {