HACK: avcodec: export progressive_sequence information

libavcodec/avcodec.h

@@ -2029,6 +2029,13 @@ typedef struct AVCodecContext {
      */
     int64_t frame_num;
 
+    /**
+     * Is the stream completely progressive?
+     * - decoding: set by avcodec
+     * - encoding: unused
+     */
+    int progressive_sequence;
+
     /**
      * Decoding only. May be set by the caller before avcodec_open2() to an
      * av_malloc()'ed array (or via AVOptions). Owned and freed by the decoder

libavcodec/h264_slice.c

@@ -1091,6 +1091,7 @@ static int h264_init_ps(H264Context *h, const H264SliceContext *sl, int first_sl
         h->avctx->profile = ff_h264_get_profile(sps);
         h->avctx->level   = sps->level_idc;
         h->avctx->refs    = sps->ref_frame_count;
+        h->avctx->progressive_sequence = sps->frame_mbs_only_flag;
 
         h->mb_width  = sps->mb_width;
         h->mb_height = sps->mb_height;

libavcodec/mpeg12dec.c

@@ -1091,6 +1091,7 @@ static void mpeg_decode_sequence_extension(Mpeg1Context *s1)
     skip_bits(&s->gb, 1); /* profile and level esc*/
     s->avctx->profile       = get_bits(&s->gb, 3);
     s->avctx->level         = get_bits(&s->gb, 4);
+    s->avctx->progressive_sequence =
     s->progressive_sequence = get_bits1(&s->gb);   /* progressive_sequence */
     s->chroma_format        = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */
 
@@ -1841,6 +1842,7 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
     s->height = height;
 
     /* We set MPEG-2 parameters so that it emulates MPEG-1. */
+    s->avctx->progressive_sequence =
     s->progressive_sequence = 1;
     s->progressive_frame    = 1;
     s->picture_structure    = PICT_FRAME;
@@ -1894,6 +1896,7 @@ static int vcr2_init_sequence(AVCodecContext *avctx)
         s->chroma_inter_matrix[j] = v;
     }
 
+    s->avctx->progressive_sequence =
     s->progressive_sequence  = 1;
     s->progressive_frame     = 1;
     s->picture_structure     = PICT_FRAME;

libavcodec/pthread_frame.c

@@ -315,6 +315,8 @@ FF_ENABLE_DEPRECATION_WARNINGS
         if (err < 0)
             return err;
 
+        dst->progressive_sequence = src->progressive_sequence;
+
         if (!!dst->hw_frames_ctx != !!src->hw_frames_ctx ||
             (dst->hw_frames_ctx && dst->hw_frames_ctx->data != src->hw_frames_ctx->data)) {
             av_buffer_unref(&dst->hw_frames_ctx);