Add support for vorbis 6.1 and 7.1 channel configurations as per the new spec

http://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-800004.3.9

Originally committed as revision 21527 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vorbis.h

@@ -25,8 +25,8 @@
 
 extern const float ff_vorbis_floor1_inverse_db_table[256];
 extern const float * const ff_vorbis_vwin[8];
-extern const uint8_t ff_vorbis_channel_layout_offsets[6][6];
-extern const int64_t ff_vorbis_channel_layouts[7];
+extern const uint8_t ff_vorbis_channel_layout_offsets[8][8];
+extern const int64_t ff_vorbis_channel_layouts[9];
 
 typedef struct {
     uint_fast16_t x;

libavcodec/vorbis_data.c

@@ -21,22 +21,26 @@
 #include "dsputil.h"
 #include "vorbis.h"
 
-const uint8_t ff_vorbis_channel_layout_offsets[6][6] = {
+const uint8_t ff_vorbis_channel_layout_offsets[8][8] = {
     { 0, },
     { 0, 1, },
     { 0, 2, 1, },
     { 0, 1, 2, 3, },
     { 0, 2, 1, 3, 4, },
-    { 0, 2, 1, 5, 3, 4, }
+    { 0, 2, 1, 5, 3, 4, },
+    { 0, 2, 1, 6, 5, 3, 4, },
+    { 0, 2, 1, 7, 5, 6, 3, 4},
 };
 
-const int64_t ff_vorbis_channel_layouts[7] = {
+const int64_t ff_vorbis_channel_layouts[9] = {
     CH_LAYOUT_MONO,
     CH_LAYOUT_STEREO,
     CH_LAYOUT_SURROUND,
     CH_LAYOUT_QUAD,
     CH_LAYOUT_5POINT0_BACK,
     CH_LAYOUT_5POINT1_BACK,
+    CH_LAYOUT_5POINT1|CH_BACK_CENTER,
+    CH_LAYOUT_7POINT1,
     0
 };
 

libavcodec/vorbis_dec.c

@@ -984,7 +984,7 @@ static av_cold int vorbis_decode_init(AVCodecContext *avccontext)
         return -1;
     }
 
-    if (vc->audio_channels > 6)
+    if (vc->audio_channels > 8)
         avccontext->channel_layout = 0;
     else
         avccontext->channel_layout = ff_vorbis_channel_layouts[vc->audio_channels - 1];
@@ -1616,7 +1616,7 @@ static int vorbis_decode_frame(AVCodecContext *avccontext,
 
     AV_DEBUG("parsed %d bytes %d bits, returned %d samples (*ch*bits) \n", get_bits_count(gb)/8, get_bits_count(gb)%8, len);
 
-    if (vc->audio_channels > 6) {
+    if (vc->audio_channels > 8) {
         for (i = 0; i < vc->audio_channels; i++)
             channel_ptrs[i] = vc->channel_floors + i * len;
     } else {