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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 {
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