Changeset 6606378 in mainline for uspace/lib/drv/generic/remote_audio_pcm.c

Timestamp:

2013-03-16T18:38:27Z (11 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

9df99a17

Parents:

92b59c7

Message:

libdrv: Add open default device helper function.

File:

• uspace/lib/drv/generic/remote_audio_pcm.c (modified) (1 diff)

uspace/lib/drv/generic/remote_audio_pcm.c

@@ -94 +94 @@
  */
 
+/**
+ * Open audio session with the first registered device.
+ *
+ * @return Pointer to a new audio device session, NULL on failure.
+ */
+audio_pcm_sess_t *audio_pcm_open_default(void)
+{
+        static bool resolved = false;
+        static category_id_t pcm_id = 0;
+        if (!resolved) {
+                const int ret = loc_category_get_id("audio-pcm", &pcm_id,
+                    IPC_FLAG_BLOCKING);
+                if (ret != EOK)
+                        return NULL;
+                resolved = true;
+        }
+
+        service_id_t *svcs = NULL;
+        size_t count = 0;
+        const int ret = loc_category_get_svcs(pcm_id, &svcs, &count);
+        if (ret != EOK)
+                return NULL;
+
+        audio_pcm_sess_t *session = NULL;
+        if (count)
+                session = audio_pcm_open_service(svcs[0]);
+        free(svcs);
+        return session;
+}
 /**
  * Open audio session with device identified by location service string.