FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/ncdec.c
Date: 2022-12-05 20:26:17
Exec Total Coverage
Lines: 30 35 85.7%
Functions: 3 3 100.0%
Branches: 12 16 75.0%

Line Branch Exec Source
1 /*
2 * NC camera feed demuxer
3 * Copyright (c) 2009 Nicolas Martin (martinic at iro dot umontreal dot ca)
4 * Edouard Auvinet
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 #include "libavutil/intreadwrite.h"
24 #include "avformat.h"
25 #include "internal.h"
26
27 #define NC_VIDEO_FLAG 0x1A5
28
29 6782 static int nc_probe(const AVProbeData *probe_packet)
30 {
31 int size;
32
33
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6782 if (AV_RB32(probe_packet->buf) != NC_VIDEO_FLAG)
34 6781 return 0;
35
36 1 size = AV_RL16(probe_packet->buf + 5);
37
38
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1 if (size + 20 > probe_packet->buf_size)
39 return AVPROBE_SCORE_MAX/4;
40
41
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1 if (AV_RB32(probe_packet->buf+16+size) == NC_VIDEO_FLAG)
42 1 return AVPROBE_SCORE_MAX;
43
44 return 0;
45 }
46
47 1 static int nc_read_header(AVFormatContext *s)
48 {
49 1 AVStream *st = avformat_new_stream(s, NULL);
50
51
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1 if (!st)
52 return AVERROR(ENOMEM);
53
54 1 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
55 1 st->codecpar->codec_id = AV_CODEC_ID_MPEG4;
56 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL;
57
58 1 avpriv_set_pts_info(st, 64, 1, 100);
59
60 1 return 0;
61 }
62
63 1057 static int nc_read_packet(AVFormatContext *s, AVPacket *pkt)
64 {
65 int size;
66 int ret;
67
68 1057 uint32_t state=-1;
69
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5281 while (state != NC_VIDEO_FLAG) {
70
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4225 if (avio_feof(s->pb))
71 1 return AVERROR(EIO);
72 4224 state = (state<<8) + avio_r8(s->pb);
73 }
74
75 1056 avio_r8(s->pb);
76 1056 size = avio_rl16(s->pb);
77 1056 avio_skip(s->pb, 9);
78
79
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1056 if (size == 0) {
80 av_log(s, AV_LOG_DEBUG, "Next packet size is zero\n");
81 return AVERROR(EAGAIN);
82 }
83
84 1056 ret = av_get_packet(s->pb, pkt, size);
85
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1056 if (ret != size) {
86 1 return AVERROR(EIO);
87 }
88
89 1055 pkt->stream_index = 0;
90 1055 return size;
91 }
92
93 const AVInputFormat ff_nc_demuxer = {
94 .name = "nc",
95 .long_name = NULL_IF_CONFIG_SMALL("NC camera feed"),
96 .read_probe = nc_probe,
97 .read_header = nc_read_header,
98 .read_packet = nc_read_packet,
99 .extensions = "v",
100 };
101