static int sp5x_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; AVPacket avpkt_recoded; const int qscale = 5; const uint8_t *buf_ptr; uint8_t *recoded; int i = 0, j = 0; if (!avctx->width || !avctx->height) return -1; buf_ptr = buf; 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)); AV_WB16(recoded+j+5, avctx->coded_height); AV_WB16(recoded+j+7, avctx->coded_width); j += sizeof(sp5x_data_sof); memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos)); j += sizeof(sp5x_data_sos); if(avctx->codec_id==CODEC_ID_AMV) for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++) recoded[j++] = buf[i]; else 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; avctx->flags &= ~CODEC_FLAG_EMU_EDGE; av_init_packet(&avpkt_recoded); avpkt_recoded.data = recoded; avpkt_recoded.size = j; i = ff_mjpeg_decode_frame(avctx, data, data_size, &avpkt_recoded); av_free(recoded); return i; }