static int svq3_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; MpegEncContext *const s = avctx->priv_data; H264Context *const h = avctx->priv_data; int m, mb_type; /* special case for last picture */ if (buf_size == 0) { if (s->next_picture_ptr && !s->low_delay) { *(AVFrame *) data = *(AVFrame *) &s->next_picture; s->next_picture_ptr = NULL; *data_size = sizeof(AVFrame); } return 0; } init_get_bits (&s->gb, buf, 8*buf_size); s->mb_x = s->mb_y = h->mb_xy = 0; if (svq3_decode_slice_header(h)) return -1; s->pict_type = h->slice_type; s->picture_number = h->slice_num; if (avctx->debug&FF_DEBUG_PICT_INFO){ av_log(h->s.avctx, AV_LOG_DEBUG, "%c hpel:%d, tpel:%d aqp:%d qp:%d, slice_num:%02X\n", av_get_pict_type_char(s->pict_type), h->halfpel_flag, h->thirdpel_flag, s->adaptive_quant, s->qscale, h->slice_num); } /* for hurry_up == 5 */ s->current_picture.pict_type = s->pict_type; s->current_picture.key_frame = (s->pict_type == FF_I_TYPE); /* Skip B-frames if we do not have reference frames. */ if (s->last_picture_ptr == NULL && s->pict_type == FF_B_TYPE) return 0; /* Skip B-frames if we are in a hurry. */ if (avctx->hurry_up && s->pict_type == FF_B_TYPE) return 0; /* Skip everything if we are in a hurry >= 5. */ if (avctx->hurry_up >= 5) return 0; if ( (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type == FF_B_TYPE) ||(avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type != FF_I_TYPE) || avctx->skip_frame >= AVDISCARD_ALL) return 0; if (s->next_p_frame_damaged) { if (s->pict_type == FF_B_TYPE) return 0; else s->next_p_frame_damaged = 0; } if (frame_start(h) < 0) return -1; if (s->pict_type == FF_B_TYPE) { h->frame_num_offset = (h->slice_num - h->prev_frame_num); if (h->frame_num_offset < 0) { h->frame_num_offset += 256; } if (h->frame_num_offset == 0 || h->frame_num_offset >= h->prev_frame_num_offset) { av_log(h->s.avctx, AV_LOG_ERROR, "error in B-frame picture id\n"); return -1; } } else { h->prev_frame_num = h->frame_num; h->frame_num = h->slice_num; h->prev_frame_num_offset = (h->frame_num - h->prev_frame_num); if (h->prev_frame_num_offset < 0) { h->prev_frame_num_offset += 256; } } for (m = 0; m < 2; m++){ int i; for (i = 0; i < 4; i++){ int j; for (j = -1; j < 4; j++) h->ref_cache[m][scan8[0] + 8*i + j]= 1; if (i < 3) h->ref_cache[m][scan8[0] + 8*i + j]= PART_NOT_AVAILABLE; } } for (s->mb_y = 0; s->mb_y < s->mb_height; s->mb_y++) { for (s->mb_x = 0; s->mb_x < s->mb_width; s->mb_x++) { h->mb_xy = s->mb_x + s->mb_y*s->mb_stride; if ( (get_bits_count(&s->gb) + 7) >= s->gb.size_in_bits && ((get_bits_count(&s->gb) & 7) == 0 || show_bits(&s->gb, (-get_bits_count(&s->gb) & 7)) == 0)) { skip_bits(&s->gb, h->next_slice_index - get_bits_count(&s->gb)); s->gb.size_in_bits = 8*buf_size; if (svq3_decode_slice_header(h)) return -1; /* TODO: support s->mb_skip_run */ } mb_type = svq3_get_ue_golomb(&s->gb); if (s->pict_type == FF_I_TYPE) { mb_type += 8; } else if (s->pict_type == FF_B_TYPE && mb_type >= 4) { mb_type += 4; } if (mb_type > 33 || svq3_decode_mb(h, mb_type)) { av_log(h->s.avctx, AV_LOG_ERROR, "error while decoding MB %d %d\n", s->mb_x, s->mb_y); return -1; } if (mb_type != 0) { hl_decode_mb (h); } if (s->pict_type != FF_B_TYPE && !s->low_delay) { s->current_picture.mb_type[s->mb_x + s->mb_y*s->mb_stride] = (s->pict_type == FF_P_TYPE && mb_type < 8) ? (mb_type - 1) : -1; } } ff_draw_horiz_band(s, 16*s->mb_y, 16); } MPV_frame_end(s); if (s->pict_type == FF_B_TYPE || s->low_delay) { *(AVFrame *) data = *(AVFrame *) &s->current_picture; } else { *(AVFrame *) data = *(AVFrame *) &s->last_picture; } avctx->frame_number = s->picture_number - 1; /* Do not output the last pic after seeking. */ if (s->last_picture_ptr || s->low_delay) { *data_size = sizeof(AVFrame); } return buf_size; }