static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al, const uint8_t *mb_bitmask, int mb_bitmask_size, const AVFrame *reference) { int i, mb_x, mb_y; uint8_t *data[MAX_COMPONENTS]; const uint8_t *reference_data[MAX_COMPONENTS]; int linesize[MAX_COMPONENTS]; GetBitContext mb_bitmask_gb = {0}; // initialize to silence gcc warning int bytes_per_pixel = 1 + (s->bits > 8); if (mb_bitmask) { if (mb_bitmask_size != (s->mb_width * s->mb_height + 7)>>3) { av_log(s->avctx, AV_LOG_ERROR, "mb_bitmask_size mismatches\n"); return AVERROR_INVALIDDATA; } init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width * s->mb_height); } s->restart_count = 0; for (i = 0; i < nb_components; i++) { int c = s->comp_index[i]; data[c] = s->picture_ptr->data[c]; reference_data[c] = reference ? reference->data[c] : NULL; linesize[c] = s->linesize[c]; s->coefs_finished[c] |= 1; } for (mb_y = 0; mb_y < s->mb_height; mb_y++) { for (mb_x = 0; mb_x < s->mb_width; mb_x++) { const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb); if (s->restart_interval && !s->restart_count) s->restart_count = s->restart_interval; if (get_bits_left(&s->gb) < 0) { av_log(s->avctx, AV_LOG_ERROR, "overread %d\n", -get_bits_left(&s->gb)); return AVERROR_INVALIDDATA; } for (i = 0; i < nb_components; i++) { uint8_t *ptr; int n, h, v, x, y, c, j; int block_offset; n = s->nb_blocks[i]; c = s->comp_index[i]; h = s->h_scount[i]; v = s->v_scount[i]; x = 0; y = 0; for (j = 0; j < n; j++) { block_offset = (((linesize[c] * (v * mb_y + y) * 8) + (h * mb_x + x) * 8 * bytes_per_pixel) >> s->avctx->lowres); if (s->interlaced && s->bottom_field) block_offset += linesize[c] >> 1; ptr = data[c] + block_offset; if (!s->progressive) { if (copy_mb) mjpeg_copy_block(s, ptr, reference_data[c] + block_offset, linesize[c], s->avctx->lowres); else { s->bdsp.clear_block(s->block); if (decode_block(s, s->block, i, s->dc_index[i], s->ac_index[i], s->quant_matrixes[s->quant_sindex[i]]) < 0) { av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x); return AVERROR_INVALIDDATA; } s->idsp.idct_put(ptr, linesize[c], s->block); if (s->bits & 7) shift_output(s, ptr, linesize[c]); } } else { int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x); int16_t *block = s->blocks[c][block_idx]; if (Ah) block[0] += get_bits1(&s->gb) * s->quant_matrixes[s->quant_sindex[i]][0] << Al; else if (decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[s->quant_sindex[i]], Al) < 0) { av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x); return AVERROR_INVALIDDATA; } } av_dlog(s->avctx, "mb: %d %d processed\n", mb_y, mb_x); av_dlog(s->avctx, "%d %d %d %d %d %d %d %d \n", mb_x, mb_y, x, y, c, s->bottom_field, (v * mb_y + y) * 8, (h * mb_x + x) * 8); if (++x == h) { x = 0; y++; } } } handle_rstn(s, nb_components); } } return 0; }