avcodec/aacdec: add support for channel configuration 14

It corresponds to the 7.1(top) layout.
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/aacdec_template.c

@@ -404,6 +404,21 @@ static uint64_t sniff_channel_order(uint8_t (*layout_map)[3], int tags)
         i++;
     }
 
+    // The previous checks would end up at 4 at this point for chan_config 14
+    if (layout == AV_CH_LAYOUT_5POINT1_BACK && tags == 5 && i == 4) {
+        const uint8_t (*reference_layout_map)[3] = aac_channel_layout_map[13];
+        for (int j = 0; j < tags; j++) {
+            if (layout_map[j][0] != reference_layout_map[j][0] ||
+                layout_map[j][2] != reference_layout_map[j][2])
+                goto end_of_layout_definition;
+        }
+
+        i += assign_pair(e2c_vec, layout_map, i,
+                         AV_CH_TOP_FRONT_LEFT,
+                         AV_CH_TOP_FRONT_RIGHT,
+                         AAC_CHANNEL_FRONT,
+                         &layout);
+    }
     // The previous checks would end up at 8 at this point for 22.2
     if (layout == PREFIX_FOR_22POINT2 && tags == 16 && i == 8) {
         const uint8_t (*reference_layout_map)[3] = aac_channel_layout_map[12];
@@ -633,7 +648,7 @@ static int set_default_channel_config(AACContext *ac, AVCodecContext *avctx,
                                       int channel_config)
 {
     if (channel_config < 1 || (channel_config > 7 && channel_config < 11) ||
-        channel_config > 13) {
+        channel_config > 14) {
         av_log(avctx, AV_LOG_ERROR,
                "invalid default channel configuration (%d)\n",
                channel_config);
@@ -717,6 +732,12 @@ static ChannelElement *get_che(AACContext *ac, int type, int elem_id)
     /* For indexed channel configurations map the channels solely based
      * on position. */
     switch (ac->oc[1].m4ac.chan_config) {
+    case 14:
+        if (ac->tags_mapped > 2 && ((type == TYPE_CPE && elem_id < 3) ||
+                                    (type == TYPE_LFE && elem_id < 1))) {
+            ac->tags_mapped++;
+            return ac->tag_che_map[type][elem_id] = ac->che[type][elem_id];
+        }
     case 13:
         if (ac->tags_mapped > 3 && ((type == TYPE_CPE && elem_id < 8) ||
                                     (type == TYPE_SCE && elem_id < 6) ||

libavcodec/aacdectab.h

@@ -68,8 +68,8 @@ static const uint8_t aac_channel_layout_map[16][16][3] = {
       { TYPE_SCE, 5, AAC_CHANNEL_FRONT }, // SCE6 = BtFC,
       { TYPE_CPE, 7, AAC_CHANNEL_FRONT }, // CPE8 = BtFL and BtFR
     },
+    { { TYPE_SCE, 0, AAC_CHANNEL_FRONT }, { TYPE_CPE, 0, AAC_CHANNEL_FRONT }, { TYPE_CPE, 1, AAC_CHANNEL_BACK }, { TYPE_LFE, 0, AAC_CHANNEL_LFE }, { TYPE_CPE, 2, AAC_CHANNEL_FRONT  }, },
     { { 0, } },
-    /* TODO: Add 7+1 TOP configuration */
 };
 
 #if FF_API_OLD_CHANNEL_LAYOUT
@@ -84,8 +84,8 @@ static const uint64_t aac_channel_layout[] = {
     AV_CH_LAYOUT_6POINT1_BACK,
     AV_CH_LAYOUT_7POINT1,
     AV_CH_LAYOUT_22POINT2,
+    AV_CH_LAYOUT_7POINT1_TOP_BACK,
     0,
-    /* AV_CH_LAYOUT_7POINT1_TOP, */
 };
 #endif
 
@@ -100,8 +100,8 @@ static const AVChannelLayout aac_ch_layout[] = {
     AV_CHANNEL_LAYOUT_6POINT1_BACK,
     AV_CHANNEL_LAYOUT_7POINT1,
     AV_CHANNEL_LAYOUT_22POINT2,
+    AV_CHANNEL_LAYOUT_7POINT1_TOP_BACK,
     { 0 },
-    /* AV_CHANNEL_LAYOUT_7POINT1_TOP, */
 };
 
 #endif /* AVCODEC_AACDECTAB_H */

libavcodec/mpeg4audio.c

@@ -56,7 +56,7 @@ static int parse_config_ALS(GetBitContext *gb, MPEG4AudioConfig *c, void *logctx
     return 0;
 }
 
-const uint8_t ff_mpeg4audio_channels[14] = {
+const uint8_t ff_mpeg4audio_channels[15] = {
     0,
     1, // mono (1/0)
     2, // stereo (2/0)
@@ -70,7 +70,8 @@ const uint8_t ff_mpeg4audio_channels[14] = {
     0,
     7, // 3/3.1
     8, // 3/2/2.1
-    24 // 3/3/3 - 5/2/3 - 3/0/0.2
+    24, // 3/3/3 - 5/2/3 - 3/0/0.2
+    8, // 3/2.1 - 2/0
 };
 
 static inline int get_object_type(GetBitContext *gb)

libavcodec/mpeg4audio.h

@@ -42,7 +42,7 @@ typedef struct MPEG4AudioConfig {
 } MPEG4AudioConfig;
 
 extern const int     ff_mpeg4audio_sample_rates[16];
-extern const uint8_t ff_mpeg4audio_channels[14];
+extern const uint8_t ff_mpeg4audio_channels[15];
 
 /**
  * Parse MPEG-4 systems extradata from a potentially unaligned GetBitContext to retrieve audio configuration.