/*
  * 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 libavcodec/sp5xdec.c

  * 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,

                               const uint8_t *buf, int buf_size)

 {
 #if 0
     MJpegDecodeContext *s = avctx->priv_data;
 #endif
     const int qscale = 5;

     const uint8_t *buf_ptr, *buf_end;
     uint8_t *recoded;

     int i = 0, j = 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));

     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;
 
     i = ff_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)
     {
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }
 

     s->picture.pict_type = FF_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;
 }
 
 AVCodec sp5x_decoder = {
     "sp5x",
     CODEC_TYPE_VIDEO,
     CODEC_ID_SP5X,
     sizeof(MJpegDecodeContext),
     ff_mjpeg_decode_init,
     NULL,
     ff_mjpeg_decode_end,
     sp5x_decode_frame,
     CODEC_CAP_DR1,

     NULL,

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

 };

 
 AVCodec amv_decoder = {
     "amv",
     CODEC_TYPE_VIDEO,
     CODEC_ID_AMV,
     sizeof(MJpegDecodeContext),
     ff_mjpeg_decode_init,
     NULL,
     ff_mjpeg_decode_end,

     sp5x_decode_frame,

     .long_name = NULL_IF_CONFIG_SMALL("AMV Video"),

 };