Merge commit 'b0017579b6e8de3d0d13dcfe0a4dd848dc6baa37'

* commit 'b0017579b6e8de3d0d13dcfe0a4dd848dc6baa37':
  h264: Add support for Closed Caption export

Conflicts:
	libavcodec/h264.c
	libavcodec/h264_sei.c

See: 8234f0e3b4
Merged-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/h264.c

@@ -880,8 +880,9 @@ static void decode_postinit(H264Context *h, int setup_finished)
     }
 
     if (h->a53_caption) {
-        AVFrameSideData *sd =
-            av_frame_new_side_data(cur->f, AV_FRAME_DATA_A53_CC, h->a53_caption_size);
+        AVFrameSideData *sd = av_frame_new_side_data(cur->f,
+                                                     AV_FRAME_DATA_A53_CC,
+                                                     h->a53_caption_size);
         if (sd)
             memcpy(sd->data, h->a53_caption, h->a53_caption_size);
         av_freep(&h->a53_caption);

libavcodec/h264.h

@@ -746,6 +746,8 @@ typedef struct H264Context {
      */
     int sei_reguserdata_afd_present;
     uint8_t active_format_description;
+    int a53_caption_size;
+    uint8_t *a53_caption;
 
     /**
      * Bit set of clock types for fields/frames in picture timing SEI message.
@@ -805,9 +807,6 @@ typedef struct H264Context {
 
     int missing_fields;
 
-    int a53_caption_size;
-    uint8_t *a53_caption;
-
 /* for frame threading, this is set to 1
      * after finish_setup() has been called, so we cannot modify
      * some context properties (which are supposed to stay constant between

libavcodec/h264_sei.c

@@ -43,9 +43,9 @@ void ff_h264_reset_sei(H264Context *h)
     h->sei_frame_packing_present    =  0;
     h->sei_display_orientation_present = 0;
     h->sei_reguserdata_afd_present  =  0;
-    if (h->a53_caption)
-        av_freep(&h->a53_caption);
+
     h->a53_caption_size = 0;
+    av_freep(&h->a53_caption);
 }
 
 static int decode_picture_timing(H264Context *h)
@@ -159,13 +159,16 @@ FF_ENABLE_DEPRECATION_WARNINGS
                 return AVERROR(EINVAL);
             user_data_type_code = get_bits(&h->gb, 8);
             if (user_data_type_code == 0x3) {
-                skip_bits(&h->gb, 1);
-                if (get_bits(&h->gb, 1)) {
-                    skip_bits(&h->gb, 1);
+                skip_bits(&h->gb, 1);           // reserved
+
+                flag = get_bits(&h->gb, 1);     // process_cc_data_flag
+                if (flag) {
+                    skip_bits(&h->gb, 1);       // zero bit
                     cc_count = get_bits(&h->gb, 5);
-                    skip_bits(&h->gb, 8);
+                    skip_bits(&h->gb, 8);       // reserved
                     size -= 2;
-                    if (cc_count && size >= cc_count*3) {
+
+                    if (cc_count && size >= cc_count * 3) {
                         int i;
                         uint8_t *tmp;
                         if ((int64_t)h->a53_caption_size + (int64_t)cc_count*3 > INT_MAX)
@@ -176,13 +179,14 @@ FF_ENABLE_DEPRECATION_WARNINGS
                         if (!tmp)
                             return AVERROR(ENOMEM);
                         h->a53_caption = tmp;
+
                         for (i = 0; i < cc_count; i++) {
                             h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
                             h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
                             h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
                         }
 
-                        skip_bits(&h->gb, 8);
+                        skip_bits(&h->gb, 8);   // marker_bits
                     }
                 }
             }