FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/loasdec.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 32 35 91.4%
Branches: 15 18 83.3%

Line Branch Exec Source
1 /*
2 * LOAS AudioSyncStream demuxer
3 * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
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 "libavutil/intreadwrite.h"
23 #include "libavutil/internal.h"
24 #include "avformat.h"
25 #include "internal.h"
26 #include "rawdec.h"
27
28 #define LOAS_SYNC_WORD 0x2b7
29
30 6780 static int loas_probe(const AVProbeData *p)
31 {
32 6780 int max_frames = 0, first_frames = 0;
33 int fsize, frames;
34 6780 const uint8_t *buf0 = p->buf;
35 const uint8_t *buf2;
36 const uint8_t *buf;
37 6780 const uint8_t *end = buf0 + p->buf_size - 3;
38 6780 buf = buf0;
39
40
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68439699 for (; buf < end; buf = buf2 + 1) {
41 68432919 buf2 = buf;
42
43
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68452538 for (frames = 0; buf2 < end; frames++) {
44 68449887 uint32_t header = AV_RB24(buf2);
45
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68449887 if ((header >> 13) != LOAS_SYNC_WORD)
46 68430255 break;
47 19632 fsize = (header & 0x1FFF) + 3;
48
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19632 if (fsize < 7)
49 13 break;
50 19619 fsize = FFMIN(fsize, end - buf2);
51 19619 buf2 += fsize;
52 }
53 68432919 max_frames = FFMAX(max_frames, frames);
54
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68432919 if (buf == buf0)
55 6780 first_frames = frames;
56 }
57
58
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6780 if (first_frames >= 3)
59 5 return AVPROBE_SCORE_EXTENSION + 1;
60
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6775 else if (max_frames > 100)
61 return AVPROBE_SCORE_EXTENSION;
62
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6775 else if (max_frames >= 3)
63 return AVPROBE_SCORE_EXTENSION / 2;
64 else
65 6775 return 0;
66 }
67
68 1 static int loas_read_header(AVFormatContext *s)
69 {
70 AVStream *st;
71
72 1 st = avformat_new_stream(s, NULL);
73
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1 if (!st)
74 return AVERROR(ENOMEM);
75
76 1 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
77 1 st->codecpar->codec_id = s->iformat->raw_codec_id;
78 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
79
80 //LCM of all possible AAC sample rates
81 1 avpriv_set_pts_info(st, 64, 1, 28224000);
82
83 1 return 0;
84 }
85
86 const AVInputFormat ff_loas_demuxer = {
87 .name = "loas",
88 .long_name = NULL_IF_CONFIG_SMALL("LOAS AudioSyncStream"),
89 .read_probe = loas_probe,
90 .read_header = loas_read_header,
91 .read_packet = ff_raw_read_partial_packet,
92 .flags= AVFMT_GENERIC_INDEX,
93 .raw_codec_id = AV_CODEC_ID_AAC_LATM,
94 .priv_data_size = sizeof(FFRawDemuxerContext),
95 .priv_class = &ff_raw_demuxer_class,
96 };
97