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  1. /*
  2.  * Alias PIX image demuxer
  3.  * Copyright (c) 2014 Michael Niedermayer
  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. #include "img2.h"
  23. #include "libavcodec/bytestream.h"
  24.  
  25. static int alias_pix_read_probe(AVProbeData *p)
  26. {
  27.     const uint8_t *b = p->buf;
  28.     const uint8_t *end = b + p->buf_size;
  29.     int width  = bytestream_get_be16(&b);
  30.     int height = bytestream_get_be16(&b);
  31.     av_unused int ox = bytestream_get_be16(&b);
  32.     av_unused int oy = bytestream_get_be16(&b);
  33.     int bpp    = bytestream_get_be16(&b);
  34.     int x, y;
  35.  
  36.     if (!width || !height)
  37.         return 0;
  38.  
  39.     if (bpp != 24 && bpp != 8)
  40.         return 0;
  41.  
  42.     for (y=0; y<2 && y<height; y++) {
  43.         for (x=0; x<width; ) {
  44.             int count = *b++;
  45.             if (count == 0 || x + count > width)
  46.                 return 0;
  47.             if (b > end)
  48.                 return AVPROBE_SCORE_MAX / 8;
  49.             b += bpp / 8;
  50.             x += count;
  51.         }
  52.     }
  53.  
  54.     return AVPROBE_SCORE_EXTENSION + 1;
  55. }
  56.  
  57. static const AVClass image2_alias_pix_class = {
  58.     .class_name = "alias_pix demuxer",
  59.     .item_name  = av_default_item_name,
  60.     .option     = ff_img_options,
  61.     .version    = LIBAVUTIL_VERSION_INT,
  62. };
  63.  
  64. AVInputFormat ff_image2_alias_pix_demuxer = {
  65.     .name           = "alias_pix",
  66.     .long_name      = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
  67.     .priv_data_size = sizeof(VideoDemuxData),
  68.     .read_probe     = alias_pix_read_probe,
  69.     .read_header    = ff_img_read_header,
  70.     .read_packet    = ff_img_read_packet,
  71.     .raw_codec_id   = AV_CODEC_ID_ALIAS_PIX,
  72.     .priv_class     = &image2_alias_pix_class,
  73. };
  74.