[pulseaudio-discuss] [PATCH 3/6] core-util: Add pa_parse_cvolume().

[Tanu Kaskinen]

---
 src/pulsecore/core-util.c |   57 +++++++++++++++++++++++++++++++++++++++++++++
 src/pulsecore/core-util.h |    1 +
 2 files changed, 58 insertions(+)

diff --git a/src/pulsecore/core-util.c b/src/pulsecore/core-util.c
index d8d44a7..b09d5d2 100644
--- a/src/pulsecore/core-util.c
+++ b/src/pulsecore/core-util.c
@@ -1002,6 +1002,63 @@ int pa_parse_volume(const char *v, pa_volume_t *volume) {
     return ret;
 }
 
+/* Parses a comma-separated list of "channel:volume" pairs. */
+int pa_parse_cvolume(const char *s, pa_cvolume *vol, pa_channel_map *map) {
+    char *channel_and_volume;
+    const char *state = NULL;
+    pa_cvolume vol_tmp;
+    pa_channel_map map_tmp;
+
+    pa_cvolume_init(&vol_tmp);
+    pa_channel_map_init(&map_tmp);
+
+    while ((channel_and_volume = pa_split(s, ",", &state))) {
+        char *channel_str;
+        char *volume_str;
+        pa_channel_position_t channel;
+        pa_volume_t volume;
+
+        if (map_tmp.channels >= PA_CHANNELS_MAX)
+            goto fail;
+
+        channel_str = channel_and_volume;
+        volume_str = channel_and_volume + strcspn(channel_and_volume, ":");
+
+        if (!*volume_str)
+            goto fail; /* No colon found. */
+
+        if (volume_str == channel_and_volume)
+            goto fail; /* No channel found. */
+
+        *volume_str = '\0'; /* Replace the colon with null. */
+        volume_str++; /* Move to the real beginning of the volume string. */
+
+        if (!*volume_str)
+            goto fail; /* No volume found. */
+
+        if ((channel = pa_channel_position_from_string(channel_str)) == PA_CHANNEL_POSITION_INVALID)
+            goto fail;
+
+        if (pa_parse_volume(volume_str, &volume) < 0)
+            goto fail;
+
+        map_tmp.map[map_tmp.channels++] = channel;
+        vol_tmp.values[vol_tmp.channels++] = volume;
+
+        pa_xfree(channel_and_volume);
+    }
+
+    *vol = vol_tmp;
+    *map = map_tmp;
+
+    return 0;
+
+fail:
+    pa_xfree(channel_and_volume);
+
+    return -1;
+}
+
 /* Split the specified string wherever one of the strings in delimiter
  * occurs. Each time it is called returns a newly allocated string
  * with pa_xmalloc(). The variable state points to, should be
diff --git a/src/pulsecore/core-util.h b/src/pulsecore/core-util.h
index 9d59383..c15b652 100644
--- a/src/pulsecore/core-util.h
+++ b/src/pulsecore/core-util.h
@@ -85,6 +85,7 @@ void pa_reset_priority(void);
 int pa_parse_boolean(const char *s) PA_GCC_PURE;
 
 int pa_parse_volume(const char *s, pa_volume_t *volume);
+int pa_parse_cvolume(const char *s, pa_cvolume *vol, pa_channel_map *map);
 
 static inline const char *pa_yes_no(pa_bool_t b) {
     return b ? "yes" : "no";
-- 
1.7.10.4