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  1. /*
  2.  * Sunplus JPEG decoder (SP5X)
  3.  * Copyright (c) 2003 Alex Beregszaszi
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. /**
  23.  * @file
  24.  * Sunplus JPEG decoder (SP5X).
  25.  */
  26.  
  27. #include "avcodec.h"
  28. #include "mjpeg.h"
  29. #include "mjpegdec.h"
  30. #include "sp5x.h"
  31.  
  32.  
  33. static int sp5x_decode_frame(AVCodecContext *avctx,
  34.                               void *data, int *got_frame,
  35.                               AVPacket *avpkt)
  36. {
  37.     const uint8_t *buf = avpkt->data;
  38.     int buf_size = avpkt->size;
  39.     AVPacket avpkt_recoded;
  40.     const int qscale = 5;
  41.     uint8_t *recoded;
  42.     int i = 0, j = 0;
  43.  
  44.     if (!avctx->width || !avctx->height)
  45.         return -1;
  46.  
  47.     recoded = av_mallocz(buf_size + 1024);
  48.     if (!recoded)
  49.         return -1;
  50.  
  51.     /* SOI */
  52.     recoded[j++] = 0xFF;
  53.     recoded[j++] = 0xD8;
  54.  
  55.     memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
  56.     memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
  57.     memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
  58.     j += sizeof(sp5x_data_dqt);
  59.  
  60.     memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
  61.     j += sizeof(sp5x_data_dht);
  62.  
  63.     memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
  64.     AV_WB16(recoded+j+5, avctx->coded_height);
  65.     AV_WB16(recoded+j+7, avctx->coded_width);
  66.     j += sizeof(sp5x_data_sof);
  67.  
  68.     memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
  69.     j += sizeof(sp5x_data_sos);
  70.  
  71.     if(avctx->codec_id==AV_CODEC_ID_AMV)
  72.         for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++)
  73.             recoded[j++] = buf[i];
  74.     else
  75.     for (i = 14; i < buf_size && j < buf_size+1024-3; i++)
  76.     {
  77.         recoded[j++] = buf[i];
  78.         if (buf[i] == 0xff)
  79.             recoded[j++] = 0;
  80.     }
  81.  
  82.     /* EOI */
  83.     recoded[j++] = 0xFF;
  84.     recoded[j++] = 0xD9;
  85.  
  86.     av_init_packet(&avpkt_recoded);
  87.     avpkt_recoded.data = recoded;
  88.     avpkt_recoded.size = j;
  89.     i = ff_mjpeg_decode_frame(avctx, data, got_frame, &avpkt_recoded);
  90.  
  91.     av_free(recoded);
  92.  
  93.     return i < 0 ? i : avpkt->size;
  94. }
  95.  
  96. #if CONFIG_SP5X_DECODER
  97. AVCodec ff_sp5x_decoder = {
  98.     .name           = "sp5x",
  99.     .long_name      = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
  100.     .type           = AVMEDIA_TYPE_VIDEO,
  101.     .id             = AV_CODEC_ID_SP5X,
  102.     .priv_data_size = sizeof(MJpegDecodeContext),
  103.     .init           = ff_mjpeg_decode_init,
  104.     .close          = ff_mjpeg_decode_end,
  105.     .decode         = sp5x_decode_frame,
  106.     .capabilities   = CODEC_CAP_DR1,
  107.     .max_lowres     = 3,
  108. };
  109. #endif
  110. #if CONFIG_AMV_DECODER
  111. AVCodec ff_amv_decoder = {
  112.     .name           = "amv",
  113.     .long_name      = NULL_IF_CONFIG_SMALL("AMV Video"),
  114.     .type           = AVMEDIA_TYPE_VIDEO,
  115.     .id             = AV_CODEC_ID_AMV,
  116.     .priv_data_size = sizeof(MJpegDecodeContext),
  117.     .init           = ff_mjpeg_decode_init,
  118.     .close          = ff_mjpeg_decode_end,
  119.     .decode         = sp5x_decode_frame,
  120. };
  121. #endif
  122.