static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al){ int i, mb_x, mb_y; uint8_t* data[MAX_COMPONENTS]; int linesize[MAX_COMPONENTS]; for(i=0; i < nb_components; i++) { int c = s->comp_index[i]; data[c] = s->picture.data[c]; linesize[c]=s->linesize[c]; s->coefs_finished[c] |= 1; if(s->flipped) { //picture should be flipped upside-down for this codec assert(!(s->avctx->flags & CODEC_FLAG_EMU_EDGE)); data[c] += (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 )); linesize[c] *= -1; } } for(mb_y = 0; mb_y < s->mb_height; mb_y++) { for(mb_x = 0; mb_x < s->mb_width; mb_x++) { if (s->restart_interval && !s->restart_count) s->restart_count = s->restart_interval; for(i=0;i<nb_components;i++) { uint8_t *ptr; int n, h, v, x, y, c, j; 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++) { ptr = data[c] + (((linesize[c] * (v * mb_y + y) * 8) + (h * mb_x + x) * 8) >> s->avctx->lowres); if(s->interlaced && s->bottom_field) ptr += linesize[c] >> 1; if(!s->progressive) { s->dsp.clear_block(s->block); if(decode_block(s, s->block, i, s->dc_index[i], s->ac_index[i], s->quant_matrixes[ s->quant_index[c] ]) < 0) { av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x); return -1; } s->dsp.idct_put(ptr, linesize[c], s->block); } else { int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x); DCTELEM *block = s->blocks[c][block_idx]; if(Ah) block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al; else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) { av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x); return -1; } } // av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x); //av_log(NULL, AV_LOG_DEBUG, "%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++; } } } if (s->restart_interval && !--s->restart_count) { align_get_bits(&s->gb); skip_bits(&s->gb, 16); /* skip RSTn */ for (i=0; i<nb_components; i++) /* reset dc */ s->last_dc[i] = 1024; } } } return 0; }