hevc: add partial support for interlaced(cherry picked from commit 44b592ae6d323445c076ef3ec966ebf9daa8bccf)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/hevc.c

@@ -2834,6 +2834,7 @@ static av_cold int hevc_decode_init(AVCodecContext *avctx)
         return ret;
 
     s->enable_parallel_tiles = 0;
+    s->picture_struct = 0;
 
     if(avctx->active_thread_type & FF_THREAD_SLICE)
         s->threads_number = avctx->thread_count;

libavcodec/hevc.h

@@ -869,9 +869,12 @@ typedef struct HEVCContext {
                           ///< as a format defined in 14496-15
     int strict_def_disp_win;
 
+    int active_seq_parameter_set_id;
+
     int nal_length_size;  ///< Number of bytes used for nal length (1, 2 or 4)
     int nuh_layer_id;
 
+    int picture_struct;
 } HEVCContext;
 
 int ff_hevc_decode_short_term_rps(HEVCContext *s, ShortTermRPS *rps,

libavcodec/hevc_parser.c

@@ -165,6 +165,8 @@ static inline int parse_nal_units(AVCodecParserContext *s,
         case NAL_IDR_N_LP:
         case NAL_CRA_NUT:
             sh->first_slice_in_pic_flag = get_bits1(gb);
+            s->picture_structure = h->picture_struct;
+            s->field_order = h->picture_struct;
 
             if (h->nal_unit_type >= 16 && h->nal_unit_type <= 23) {
                 s->key_frame = 1;

libavcodec/hevc_refs.c

@@ -106,6 +106,8 @@ static HEVCFrame *alloc_frame(HEVCContext *s)
         for (j = 0; j < frame->ctb_count; j++)
             frame->rpl_tab[j] = (RefPicListTab*)frame->rpl_buf->data;
 
+        frame->frame->top_field_first  = s->picture_struct == AV_PICTURE_STRUCTURE_TOP_FIELD;
+        frame->frame->interlaced_frame = (s->picture_struct == AV_PICTURE_STRUCTURE_TOP_FIELD) || (s->picture_struct == AV_PICTURE_STRUCTURE_BOTTOM_FIELD);
         return frame;
 fail:
         ff_hevc_unref_frame(s, frame, ~0);

libavcodec/hevc_sei.c

@@ -51,9 +51,9 @@ static void decode_nal_sei_decoded_picture_hash(HEVCContext *s, int payload_size
     }
 }
 
-static void decode_nal_sei_frame_packing_arrangement(HEVCLocalContext *lc)
+static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
 {
-    GetBitContext *gb = &lc->gb;
+    GetBitContext *gb = &s->HEVClc->gb;
     int cancel, type, quincunx;
 
     get_ue_golomb(gb);                      // frame_packing_arrangement_id
@@ -77,6 +77,46 @@ static void decode_nal_sei_frame_packing_arrangement(HEVCLocalContext *lc)
     skip_bits1(gb);                         // upsampled_aspect_ratio_flag
 }
 
+static int decode_pic_timing(HEVCContext *s)
+{
+    GetBitContext *gb = &s->HEVClc->gb;
+    HEVCSPS *sps = (HEVCSPS*)s->sps_list[s->active_seq_parameter_set_id]->data;
+
+    if (!sps)
+        return(AVERROR(ENOMEM));
+
+    if (sps->vui.frame_field_info_present_flag) {
+        int pic_struct = get_bits(gb, 4);
+        s->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN;
+        if (pic_struct == 2) {
+            av_log(s->avctx, AV_LOG_DEBUG, "BOTTOM Field\n");
+            s->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
+        } else if (pic_struct == 1) {
+            av_log(s->avctx, AV_LOG_DEBUG, "TOP Field\n");
+            s->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD;
+        }
+        get_bits(gb, 2);                   // source_scan_type
+        get_bits(gb, 1);                   // duplicate_flag
+    }
+    return 1;
+}
+
+static void active_parameter_sets(HEVCContext *s) {
+    GetBitContext *gb = &s->HEVClc->gb;
+    int num_sps_ids_minus1;
+    int i;
+
+    get_bits(gb, 4); // active_video_parameter_set_id
+    get_bits(gb, 1); // self_contained_cvs_flag
+    get_bits(gb, 1); // num_sps_ids_minus1
+    num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1
+
+    s->active_seq_parameter_set_id = get_ue_golomb_long(gb);
+
+    for (i = 1; i <= num_sps_ids_minus1; i++)
+        get_ue_golomb_long(gb); // active_seq_parameter_set_id[i]
+}
+
 static int decode_nal_sei_message(HEVCContext *s)
 {
     GetBitContext *gb = &s->HEVClc->gb;
@@ -96,13 +136,25 @@ static int decode_nal_sei_message(HEVCContext *s)
         payload_size += byte;
     }
     if (s->nal_unit_type == NAL_SEI_PREFIX) {
-        if (payload_type == 256 /*&& s->decode_checksum_sei*/)
+        if (payload_type == 256 /*&& s->decode_checksum_sei*/) {
             decode_nal_sei_decoded_picture_hash(s, payload_size);
-        else if (payload_type == 45)
-            decode_nal_sei_frame_packing_arrangement(s->HEVClc);
-        else {
+            return 1;
+        } else if (payload_type == 45) {
+            decode_nal_sei_frame_packing_arrangement(s);
+            return 1;
+        } else if (payload_type == 1){
+            int ret = decode_pic_timing(s);
             av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
             skip_bits(gb, 8*payload_size);
+            return ret;
+        } else if (payload_type == 129){
+            active_parameter_sets(s);
+            av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
+            return 1;
+        } else {
+            av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
+            skip_bits(gb, 8*payload_size);
+            return 1;
         }
     } else { /* nal_unit_type == NAL_SEI_SUFFIX */
         if (payload_type == 132 /* && s->decode_checksum_sei */)
@@ -111,8 +163,8 @@ static int decode_nal_sei_message(HEVCContext *s)
             av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
             skip_bits(gb, 8*payload_size);
         }
+        return 1;
     }
-    return 0;
 }
 
 static int more_rbsp_data(GetBitContext *gb)
@@ -122,8 +174,12 @@ static int more_rbsp_data(GetBitContext *gb)
 
 int ff_hevc_decode_nal_sei(HEVCContext *s)
 {
+    int ret;
+
     do {
-        decode_nal_sei_message(s);
+        ret = decode_nal_sei_message(s);
+        if (ret < 0)
+            return(AVERROR(ENOMEM));
     } while (more_rbsp_data(&s->HEVClc->gb));
-    return 0;
+    return 1;
 }