avcodec/aacdec: fix parsing streams with channel configuration 11

Set the correct amount of tags in tags_per_config[].
Also, there are no channels that correspond to a side element in this
configuration, so reflect this in the list of known/supported channel layouts.

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/aacdec_template.c

@@ -731,9 +731,7 @@ static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
             return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][2];
         }
     case 11:
-        if (ac->tags_mapped == 2 &&
-            ac->oc[1].m4ac.chan_config == 11 &&
-            type == TYPE_SCE) {
+        if (ac->tags_mapped == 3 && type == TYPE_SCE) {
             ac->tags_mapped++;
             return ac->tag_che_map[TYPE_SCE][elem_id] = ac->che[TYPE_SCE][1];
         }

libavcodec/aacdectab.h

@@ -35,7 +35,7 @@
 
 #include <stdint.h>
 
-static const int8_t tags_per_config[16] = { 0, 1, 1, 2, 3, 3, 4, 5, 0, 0, 0, 4, 5, 16, 5, 0 };
+static const int8_t tags_per_config[16] = { 0, 1, 1, 2, 3, 3, 4, 5, 0, 0, 0, 5, 5, 16, 5, 0 };
 
 static const uint8_t aac_channel_layout_map[16][16][3] = {
     { { TYPE_SCE, 0, AAC_CHANNEL_FRONT }, },
@@ -81,7 +81,7 @@ static const uint64_t aac_channel_layout[] = {
     AV_CH_LAYOUT_5POINT0_BACK,
     AV_CH_LAYOUT_5POINT1_BACK,
     AV_CH_LAYOUT_7POINT1_WIDE_BACK,
-    AV_CH_LAYOUT_6POINT1,
+    AV_CH_LAYOUT_6POINT1_BACK,
     AV_CH_LAYOUT_7POINT1,
     AV_CH_LAYOUT_22POINT2,
     0,
@@ -97,7 +97,7 @@ static const AVChannelLayout aac_ch_layout[] = {
     AV_CHANNEL_LAYOUT_5POINT0_BACK,
     AV_CHANNEL_LAYOUT_5POINT1_BACK,
     AV_CHANNEL_LAYOUT_7POINT1_WIDE_BACK,
-    AV_CHANNEL_LAYOUT_6POINT1,
+    AV_CHANNEL_LAYOUT_6POINT1_BACK,
     AV_CHANNEL_LAYOUT_7POINT1,
     AV_CHANNEL_LAYOUT_22POINT2,
     { 0 },