FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/shortendec.c
Date: 2024-03-29 01:21:52
Exec Total Coverage
Lines: 19 29 65.5%
Functions: 1 1 100.0%
Branches: 14 26 53.8%

Line Branch Exec Source
1 /*
2 * Shorten demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2005 Alex Beregszaszi
5 * Copyright (c) 2015 Carl Eugen Hoyos
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #include "avformat.h"
25 #include "demux.h"
26 #include "rawdec.h"
27 #include "libavcodec/golomb.h"
28
29 7124 static int shn_probe(const AVProbeData *p)
30 {
31 GetBitContext gb;
32 int version, internal_ftype, channels, blocksize;
33
34
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7124 if (AV_RB32(p->buf) != 0x616a6b67)
35 7123 return 0;
36 1 version = p->buf[4];
37
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1 if (init_get_bits8(&gb, p->buf + 5, p->buf_size - 5 - AV_INPUT_BUFFER_PADDING_SIZE) < 0)
38 return 0;
39
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1 if (!version) {
40 internal_ftype = get_ur_golomb_shorten(&gb, 4);
41 channels = get_ur_golomb_shorten(&gb, 0);
42 blocksize = 256;
43 } else {
44 unsigned k;
45 1 k = get_ur_golomb_shorten(&gb, 2);
46
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1 if (k > 31)
47 return 0;
48 1 internal_ftype = get_ur_golomb_shorten(&gb, k);
49 1 k = get_ur_golomb_shorten(&gb, 2);
50
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1 if (k > 31)
51 return 0;
52 1 channels = get_ur_golomb_shorten(&gb, k);
53 1 k = get_ur_golomb_shorten(&gb, 2);
54
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1 if (k > 31)
55 return 0;
56 1 blocksize = get_ur_golomb_shorten(&gb, k);
57 }
58
59
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1 if (internal_ftype != 2 && internal_ftype != 3 && internal_ftype != 5)
60 return 0;
61
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1 if (channels < 1 || channels > 8)
62 return 0;
63
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1 if (blocksize < 1 || blocksize > 65535)
64 return 0;
65
66 1 return AVPROBE_SCORE_EXTENSION + 1;
67 }
68
69 const FFInputFormat ff_shorten_demuxer = {
70 .p.name = "shn",
71 .p.long_name = NULL_IF_CONFIG_SMALL("raw Shorten"),
72 .p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
73 .p.extensions = "shn",
74 .p.priv_class = &ff_raw_demuxer_class,
75 .read_probe = shn_probe,
76 .read_header = ff_raw_audio_read_header,
77 .read_packet = ff_raw_read_partial_packet,
78 .raw_codec_id = AV_CODEC_ID_SHORTEN,
79 .priv_data_size = sizeof(FFRawDemuxerContext),
80 };
81