static int sp5x_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { #if 0 MJpegDecodeContext *s = avctx->priv_data; #endif const int qscale = 5; uint8_t *buf_ptr, *buf_end, *recoded; int i = 0, j = 0; /* no supplementary picture */ if (buf_size == 0) return 0; if (!avctx->width || !avctx->height) return -1; buf_ptr = buf; buf_end = buf + buf_size; #if 1 recoded = av_mallocz(buf_size + 1024); if (!recoded) return -1; /* SOI */ recoded[j++] = 0xFF; recoded[j++] = 0xD8; memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt)); memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64); memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64); j += sizeof(sp5x_data_dqt); memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht)); j += sizeof(sp5x_data_dht); memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof)); recoded[j+5] = (avctx->coded_height >> 8) & 0xFF; recoded[j+6] = avctx->coded_height & 0xFF; recoded[j+7] = (avctx->coded_width >> 8) & 0xFF; recoded[j+8] = avctx->coded_width & 0xFF; j += sizeof(sp5x_data_sof); memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos)); j += sizeof(sp5x_data_sos); for (i = 14; i < buf_size && j < buf_size+1024-2; i++) { recoded[j++] = buf[i]; if (buf[i] == 0xff) recoded[j++] = 0; } /* EOI */ recoded[j++] = 0xFF; recoded[j++] = 0xD9; i = mjpeg_decode_frame(avctx, data, data_size, recoded, j); av_free(recoded); #else /* SOF */ s->bits = 8; s->width = avctx->coded_width; s->height = avctx->coded_height; s->nb_components = 3; s->component_id[0] = 0; s->h_count[0] = 2; s->v_count[0] = 2; s->quant_index[0] = 0; s->component_id[1] = 1; s->h_count[1] = 1; s->v_count[1] = 1; s->quant_index[1] = 1; s->component_id[2] = 2; s->h_count[2] = 1; s->v_count[2] = 1; s->quant_index[2] = 1; s->h_max = 2; s->v_max = 2; s->qscale_table = av_mallocz((s->width+15)/16); avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420; s->interlaced = 0; s->picture.reference = 0; if (avctx->get_buffer(avctx, &s->picture) < 0) { fprintf(stderr, "get_buffer() failed\n"); return -1; } s->picture.pict_type = I_TYPE; s->picture.key_frame = 1; for (i = 0; i < 3; i++) s->linesize[i] = s->picture.linesize[i] << s->interlaced; /* DQT */ for (i = 0; i < 64; i++) { j = s->scantable.permutated[i]; s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i]; } s->qscale[0] = FFMAX( s->quant_matrixes[0][s->scantable.permutated[1]], s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1; for (i = 0; i < 64; i++) { j = s->scantable.permutated[i]; s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i]; } s->qscale[1] = FFMAX( s->quant_matrixes[1][s->scantable.permutated[1]], s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1; /* DHT */ /* SOS */ s->comp_index[0] = 0; s->nb_blocks[0] = s->h_count[0] * s->v_count[0]; s->h_scount[0] = s->h_count[0]; s->v_scount[0] = s->v_count[0]; s->dc_index[0] = 0; s->ac_index[0] = 0; s->comp_index[1] = 1; s->nb_blocks[1] = s->h_count[1] * s->v_count[1]; s->h_scount[1] = s->h_count[1]; s->v_scount[1] = s->v_count[1]; s->dc_index[1] = 1; s->ac_index[1] = 1; s->comp_index[2] = 2; s->nb_blocks[2] = s->h_count[2] * s->v_count[2]; s->h_scount[2] = s->h_count[2]; s->v_scount[2] = s->v_count[2]; s->dc_index[2] = 1; s->ac_index[2] = 1; for (i = 0; i < 3; i++) s->last_dc[i] = 1024; s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8); s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8); init_get_bits(&s->gb, buf+14, (buf_size-14)*8); return mjpeg_decode_scan(s); #endif return i; }