static int vc9_decode_init(AVCodecContext *avctx) { VC9Context *v = avctx->priv_data; MpegEncContext *s = &v->s; GetBitContext gb; if (!avctx->extradata_size || !avctx->extradata) return -1; avctx->pix_fmt = PIX_FMT_YUV420P; v->s.avctx = avctx; if(ff_h263_decode_init(avctx) < 0) return -1; if (vc9_init_common(v) < 0) return -1; avctx->coded_width = avctx->width; avctx->coded_height = avctx->height; if (avctx->codec_id == CODEC_ID_WMV3) { int count = 0; // looks like WMV3 has a sequence header stored in the extradata // advanced sequence header may be before the first frame // the last byte of the extradata is a version number, 1 for the // samples we can decode init_get_bits(&gb, avctx->extradata, avctx->extradata_size); decode_sequence_header(avctx, &gb); count = avctx->extradata_size*8 - get_bits_count(&gb); if (count>0) { av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n", count, get_bits(&gb, count)); } else { av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count); } } avctx->has_b_frames= !!(avctx->max_b_frames); s->mb_width = (avctx->coded_width+15)>>4; s->mb_height = (avctx->coded_height+15)>>4; /* Allocate mb bitplanes */ if (alloc_bitplane(&v->mv_type_mb_plane, s->mb_width, s->mb_height) < 0) return -1; if (alloc_bitplane(&v->mv_type_mb_plane, s->mb_width, s->mb_height) < 0) return -1; if (alloc_bitplane(&v->skip_mb_plane, s->mb_width, s->mb_height) < 0) return -1; if (alloc_bitplane(&v->direct_mb_plane, s->mb_width, s->mb_height) < 0) return -1; /* For predictors */ v->previous_line_cbpcy = (uint8_t *)av_malloc(s->mb_stride*4); if (!v->previous_line_cbpcy) return -1; #if HAS_ADVANCED_PROFILE if (v->profile > PROFILE_MAIN) { if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0) return -1; if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0) return -1; } #endif return 0; }