One const is enough.

Originally committed as revision 15847 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/audioconvert.c

@@ -104,7 +104,7 @@ static const struct {
     const char *name;
     int         nb_channels;
     int64_t     layout;
-} const channel_layout_map[] = {
+} channel_layout_map[] = {
     { "mono",        1,  CH_LAYOUT_MONO },
     { "stereo",      2,  CH_LAYOUT_STEREO },
     { "surround",    3,  CH_LAYOUT_SURROUND },