@@ -131,3 +131,11 @@ int av_get_channel_layout_nb_channels(int64_t channel_layout)

         x &= x-1; // unset lowest set bit

     return count;

 }

+

+int av_get_default_channel_layout(int nb_channels) {

+    int i;

+    for (i = 0; channel_layout_map[i].name; i++)

+        if (nb_channels == channel_layout_map[i].nb_channels)

+            return channel_layout_map[i].layout;

+    return 0;

+}

@@ -92,4 +92,9 @@ void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, int6

  */

 int av_get_channel_layout_nb_channels(int64_t channel_layout);

+/**

+ * Return default channel layout for a given number of channels.

+ */

+int av_get_default_channel_layout(int nb_channels);

+

 #endif /* AVUTIL_AUDIOCONVERT_H */