+#include "get_bits.h"
+
+typedef struct {
+ ParseContext pc;
+ VC1Context v;
+} VC1ParseContext;
+
+static void vc1_extract_headers(AVCodecParserContext *s, AVCodecContext *avctx,
+ const uint8_t *buf, int buf_size)
+{
+ VC1ParseContext *vpc = s->priv_data;
+ GetBitContext gb;
+ const uint8_t *start, *end, *next;
+ uint8_t *buf2 = av_mallocz(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+
+ vpc->v.s.avctx = avctx;
+ vpc->v.parse_only = 1;
+ next = buf;
+ s->repeat_pict = 0;
+
+ for(start = buf, end = buf + buf_size; next < end; start = next){
+ int buf2_size, size;
+
+ next = find_next_marker(start + 4, end);
+ size = next - start - 4;
+ buf2_size = vc1_unescape_buffer(start + 4, size, buf2);
+ init_get_bits(&gb, buf2, buf2_size * 8);
+ if(size <= 0) continue;
+ switch(AV_RB32(start)){
+ case VC1_CODE_SEQHDR:
+ ff_vc1_decode_sequence_header(avctx, &vpc->v, &gb);
+ break;
+ case VC1_CODE_ENTRYPOINT:
+ ff_vc1_decode_entry_point(avctx, &vpc->v, &gb);
+ break;
+ case VC1_CODE_FRAME:
+ if(vpc->v.profile < PROFILE_ADVANCED)
+ ff_vc1_parse_frame_header (&vpc->v, &gb);
+ else
+ ff_vc1_parse_frame_header_adv(&vpc->v, &gb);
+
+ /* keep AV_PICTURE_TYPE_BI internal to VC1 */
+ if (vpc->v.s.pict_type == AV_PICTURE_TYPE_BI)
+ s->pict_type = AV_PICTURE_TYPE_B;
+ else
+ s->pict_type = vpc->v.s.pict_type;
+
+ if (avctx->ticks_per_frame > 1){
+ // process pulldown flags
+ s->repeat_pict = 1;
+ // Pulldown flags are only valid when 'broadcast' has been set.
+ // So ticks_per_frame will be 2
+ if (vpc->v.rff){
+ // repeat field
+ s->repeat_pict = 2;
+ }else if (vpc->v.rptfrm){
+ // repeat frames
+ s->repeat_pict = vpc->v.rptfrm * 2 + 1;
+ }
+ }
+
+ break;
+ }
+ }
+
+ av_free(buf2);
+}