/*
  * Sunplus JPEG decoder (SP5X)
  * Copyright (c) 2003 Alex Beregszaszi
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**

  * @file

  * Sunplus JPEG decoder (SP5X).
  */
 
 #include "avcodec.h"
 #include "mjpeg.h"
 #include "mjpegdec.h"
 #include "sp5x.h"
 
 
 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;

     uint8_t *recoded;

     int i = 0, j = 0;
 
     if (!avctx->width || !avctx->height)
         return -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));

     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;
 

     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;
 }
 

 AVCodec ff_sp5x_decoder = {

     "sp5x",

     AVMEDIA_TYPE_VIDEO,

     CODEC_ID_SP5X,
     sizeof(MJpegDecodeContext),
     ff_mjpeg_decode_init,
     NULL,
     ff_mjpeg_decode_end,
     sp5x_decode_frame,
     CODEC_CAP_DR1,

     NULL,

     .max_lowres = 3,

     .long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),

 };

 AVCodec ff_amv_decoder = {

     "amv",

     AVMEDIA_TYPE_VIDEO,

     CODEC_ID_AMV,
     sizeof(MJpegDecodeContext),
     ff_mjpeg_decode_init,
     NULL,
     ff_mjpeg_decode_end,

     sp5x_decode_frame,

     0,

     .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),

 };