blob: c2650ad1b34645dc1f039a6e06b72f5259392724
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 |