Add 3 channel layout convenience macros.

Originally committed as revision 18609 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/audioconvert.c

@@ -108,6 +108,7 @@ static const struct {
     { "mono",        1,  CH_LAYOUT_MONO },
     { "stereo",      2,  CH_LAYOUT_STEREO },
     { "surround",    3,  CH_LAYOUT_SURROUND },
+    { "4.0",         4,  CH_LAYOUT_4POINT0 },
     { "quad",        4,  CH_LAYOUT_QUAD },
     { "5.0",         5,  CH_LAYOUT_5POINT0 },
     { "5.0",         5,  CH_LAYOUT_5POINT0_BACK },

libavcodec/avcodec.h

@@ -30,7 +30,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 52
-#define LIBAVCODEC_VERSION_MINOR 26
+#define LIBAVCODEC_VERSION_MINOR 27
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
@@ -380,7 +380,10 @@ enum SampleFormat {
 /* Audio channel convenience macros */
 #define CH_LAYOUT_MONO              (CH_FRONT_CENTER)
 #define CH_LAYOUT_STEREO            (CH_FRONT_LEFT|CH_FRONT_RIGHT)
+#define CH_LAYOUT_2_1               (CH_LAYOUT_STEREO|CH_BACK_CENTER)
 #define CH_LAYOUT_SURROUND          (CH_LAYOUT_STEREO|CH_FRONT_CENTER)
+#define CH_LAYOUT_4POINT0           (CH_LAYOUT_SURROUND|CH_BACK_CENTER)
+#define CH_LAYOUT_2_2               (CH_LAYOUT_STEREO|CH_SIDE_LEFT|CH_SIDE_RIGHT)
 #define CH_LAYOUT_QUAD              (CH_LAYOUT_STEREO|CH_BACK_LEFT|CH_BACK_RIGHT)
 #define CH_LAYOUT_5POINT0           (CH_LAYOUT_SURROUND|CH_SIDE_LEFT|CH_SIDE_RIGHT)
 #define CH_LAYOUT_5POINT1           (CH_LAYOUT_5POINT0|CH_LOW_FREQUENCY)