Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 | }; |