[FFmpeg-devel] [PATCH 5/5] avcodec/aacdec_template: add support for 22.2 / channel_config 13

[Jan Ekström]

---
 libavcodec/aacdec_template.c | 53 +++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/libavcodec/aacdec_template.c b/libavcodec/aacdec_template.c
index 0590e77d75..0be0ad6566 100644
--- a/libavcodec/aacdec_template.c
+++ b/libavcodec/aacdec_template.c
@@ -378,6 +378,50 @@ static uint64_t sniff_channel_order(uint8_t (*layout_map)[3], int tags)
         i++;
     }
 
+    // The previous checks would end up at 8 at this point for 22.2
+    if (tags == 16 && i == 8) {
+        e2c_vec[i] = (struct elem_to_channel) {
+            .av_position  = AV_CH_TOP_FRONT_CENTER,
+            .syn_ele      = layout_map[i][0],
+            .elem_id      = layout_map[i][1],
+            .aac_position = layout_map[i][2]
+        }; i++;
+        i += assign_pair(e2c_vec, layout_map, i,
+                         AV_CH_TOP_FRONT_LEFT,
+                         AV_CH_TOP_FRONT_RIGHT,
+                         AAC_CHANNEL_FRONT);
+        i += assign_pair(e2c_vec, layout_map, i,
+                         AV_CH_TOP_SIDE_LEFT,
+                         AV_CH_TOP_SIDE_RIGHT,
+                         AAC_CHANNEL_SIDE);
+        e2c_vec[i] = (struct elem_to_channel) {
+            .av_position  = AV_CH_TOP_CENTER,
+            .syn_ele      = layout_map[i][0],
+            .elem_id      = layout_map[i][1],
+            .aac_position = layout_map[i][2]
+        }; i++;
+        i += assign_pair(e2c_vec, layout_map, i,
+                         AV_CH_TOP_BACK_LEFT,
+                         AV_CH_TOP_BACK_RIGHT,
+                         AAC_CHANNEL_BACK);
+        e2c_vec[i] = (struct elem_to_channel) {
+            .av_position  = AV_CH_TOP_BACK_CENTER,
+            .syn_ele      = layout_map[i][0],
+            .elem_id      = layout_map[i][1],
+            .aac_position = layout_map[i][2]
+        }; i++;
+        e2c_vec[i] = (struct elem_to_channel) {
+            .av_position  = AV_CH_BOTTOM_FRONT_CENTER,
+            .syn_ele      = layout_map[i][0],
+            .elem_id      = layout_map[i][1],
+            .aac_position = layout_map[i][2]
+        }; i++;
+        i += assign_pair(e2c_vec, layout_map, i,
+                         AV_CH_BOTTOM_FRONT_LEFT,
+                         AV_CH_BOTTOM_FRONT_RIGHT,
+                         AAC_CHANNEL_FRONT);
+    }
+
     // Must choose a stable sort
     total_non_cc_elements = n = i;
     do {
@@ -526,7 +570,7 @@ 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 > 12) {
+        channel_config > 13) {
         av_log(avctx, AV_LOG_ERROR,
                "invalid default channel configuration (%d)\n",
                channel_config);
@@ -606,6 +650,13 @@ 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 13:
+        if (ac->tags_mapped > 3 && ((type == TYPE_CPE && elem_id < 8) ||
+                                    (type == TYPE_SCE && elem_id < 6) ||
+                                    (type == TYPE_LFE && elem_id < 2))) {
+            ac->tags_mapped++;
+            return ac->tag_che_map[type][elem_id] = ac->che[type][elem_id];
+        }
     case 12:
     case 7:
         if (ac->tags_mapped == 3 && type == TYPE_CPE) {
-- 
2.26.2