FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/lmlm4.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 42 52 80.8%
Branches: 21 34 61.8%

Line Branch Exec Source
1 /*
2 * Linux Media Labs MPEG-4 demuxer
3 * Copyright (c) 2008 Ivo van Poorten
4 *
5 * Due to a lack of sample files, only files with one channel are supported.
6 * u-law and ADPCM audio are unsupported for the same reason.
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include "libavutil/intreadwrite.h"
26
27 #include "avformat.h"
28 #include "internal.h"
29
30 #define LMLM4_I_FRAME 0x00
31 #define LMLM4_P_FRAME 0x01
32 #define LMLM4_B_FRAME 0x02
33 #define LMLM4_INVALID 0x03
34 #define LMLM4_MPEG1L2 0x04
35
36 #define LMLM4_MAX_PACKET_SIZE 1024 * 1024
37
38 6780 static int lmlm4_probe(const AVProbeData *pd)
39 {
40 6780 const unsigned char *buf = pd->buf;
41 unsigned int frame_type, packet_size;
42
43 6780 frame_type = AV_RB16(buf + 2);
44 6780 packet_size = AV_RB32(buf + 4);
45
46
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6780 if (!AV_RB16(buf) && frame_type <= LMLM4_MPEG1L2 && packet_size &&
47
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423 frame_type != LMLM4_INVALID && packet_size <= LMLM4_MAX_PACKET_SIZE) {
48
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1 if (frame_type == LMLM4_MPEG1L2) {
49
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1 if ((AV_RB16(buf + 8) & 0xfffe) != 0xfffc)
50 return 0;
51 /* I could calculate the audio framesize and compare with
52 * packet_size-8, but that seems overkill */
53 1 return AVPROBE_SCORE_MAX / 3;
54 } else if (AV_RB24(buf + 8) == 0x000001) { /* PES Signal */
55 return AVPROBE_SCORE_MAX / 5;
56 }
57 }
58
59 6779 return 0;
60 }
61
62 1 static int lmlm4_read_header(AVFormatContext *s)
63 {
64 AVStream *st;
65
66
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1 if (!(st = avformat_new_stream(s, NULL)))
67 return AVERROR(ENOMEM);
68 1 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
69 1 st->codecpar->codec_id = AV_CODEC_ID_MPEG4;
70 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
71 1 avpriv_set_pts_info(st, 64, 1001, 30000);
72
73
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1 if (!(st = avformat_new_stream(s, NULL)))
74 return AVERROR(ENOMEM);
75 1 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
76 1 st->codecpar->codec_id = AV_CODEC_ID_MP2;
77 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
78
79 /* the parameters will be extracted from the compressed bitstream */
80 1 return 0;
81 }
82
83 240 static int lmlm4_read_packet(AVFormatContext *s, AVPacket *pkt)
84 {
85 240 AVIOContext *pb = s->pb;
86 int ret;
87 unsigned int frame_type, packet_size, padding, frame_size;
88
89 240 avio_rb16(pb); /* channel number */
90 240 frame_type = avio_rb16(pb);
91 240 packet_size = avio_rb32(pb);
92 240 padding = -packet_size & 511;
93 240 frame_size = packet_size - 8;
94
95
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240 if (frame_type > LMLM4_MPEG1L2 || frame_type == LMLM4_INVALID) {
96 av_log(s, AV_LOG_ERROR, "invalid or unsupported frame_type\n");
97 return AVERROR(EIO);
98 }
99
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240 if (packet_size > LMLM4_MAX_PACKET_SIZE || packet_size<=8) {
100 av_log(s, AV_LOG_ERROR, "packet size %d is invalid\n", packet_size);
101 return AVERROR(EIO);
102 }
103
104
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240 if ((ret = av_get_packet(pb, pkt, frame_size)) <= 0)
105 return AVERROR(EIO);
106
107 240 avio_skip(pb, padding);
108
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240 switch (frame_type) {
110 6 case LMLM4_I_FRAME:
111 6 pkt->flags = AV_PKT_FLAG_KEY;
112 92 case LMLM4_P_FRAME:
113 case LMLM4_B_FRAME:
114 92 pkt->stream_index = 0;
115 92 break;
116 148 case LMLM4_MPEG1L2:
117 148 pkt->stream_index = 1;
118 148 break;
119 }
120
121 240 return ret;
122 }
123
124 const AVInputFormat ff_lmlm4_demuxer = {
125 .name = "lmlm4",
126 .long_name = NULL_IF_CONFIG_SMALL("raw lmlm4"),
127 .read_probe = lmlm4_probe,
128 .read_header = lmlm4_read_header,
129 .read_packet = lmlm4_read_packet,
130 };
131