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img2_alias_pix.c
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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 
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 
58  .name = "alias_pix",
59  .long_name = NULL_IF_CONFIG_SMALL("Alias/Wavefront PIX image"),
60  .priv_data_size = sizeof(VideoDemuxData),
64  .raw_codec_id = AV_CODEC_ID_ALIAS_PIX,
65 };