add support for parsing channel maps as module arguments

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@802 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/polypcore/modargs.c

@@ -259,3 +259,50 @@ int pa_modargs_get_sample_spec(pa_modargs *ma, pa_sample_spec *rss) {
     
     return 0;
 }
+
+int pa_modargs_get_channel_map(pa_modargs *ma, pa_channel_map *rmap) {
+    pa_channel_map map;
+    const char *cm;
+    
+    assert(ma);
+    assert(rmap);
+
+    map = *rmap;
+
+    if ((cm = pa_modargs_get_value(ma, "channel_map", NULL)))
+        if (!pa_channel_map_parse(&map, cm))
+            return -1;
+
+    if (!pa_channel_map_valid(&map))
+        return -1;
+
+    *rmap = map;
+    return 0;
+}
+
+int pa_modargs_get_sample_spec_and_channel_map(pa_modargs *ma, pa_sample_spec *rss, pa_channel_map *rmap) {
+    pa_sample_spec ss;
+    pa_channel_map map;
+    
+    assert(ma);
+    assert(rss);
+    assert(rmap);
+
+    ss = *rss;
+
+    if (pa_modargs_get_sample_spec(ma, &ss) < 0)
+        return -1;
+
+    pa_channel_map_init_auto(&map, ss.channels);
+
+    if (pa_modargs_get_channel_map(ma, &map) < 0)
+        return -1;
+
+    if (map.channels != ss.channels)
+        return -1;
+
+    *rmap = map;
+    *rss = ss;
+
+    return 0;
+}

src/polypcore/modargs.h

@@ -24,6 +24,7 @@
 
 #include <inttypes.h>
 #include <polyp/sample.h>
+#include <polyp/channelmap.h>
 #include <polypcore/core.h>
 
 typedef struct pa_modargs pa_modargs;
@@ -46,4 +47,14 @@ int pa_modargs_get_value_boolean(pa_modargs *ma, const char *key, int *value);
 /* Return sample spec data from the three arguments "rate", "format" and "channels" */
 int pa_modargs_get_sample_spec(pa_modargs *ma, pa_sample_spec *ss);
 
+/* Return channel map data from the argument "channel_map" */
+int pa_modargs_get_channel_map(pa_modargs *ma, pa_channel_map *map);
+
+/* Combination of pa_modargs_get_sample_spec() and
+pa_modargs_get_channel_map(). Not always suitable, since this routine
+initializes the map parameter based on the channels field of the ss
+structure if no channel_map is found, using pa_channel_map_init_auto() */
+
+int pa_modargs_get_sample_spec_and_channel_map(pa_modargs *ma, pa_sample_spec *ss, pa_channel_map *map);
+
 #endif