FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/lmlm4.c
Date: 2024-04-25 15:36:26
Exec Total Coverage
Lines: 42 52 80.8%
Functions: 3 3 100.0%
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 "demux.h"
29 #include "internal.h"
30
31 #define LMLM4_I_FRAME 0x00
32 #define LMLM4_P_FRAME 0x01
33 #define LMLM4_B_FRAME 0x02
34 #define LMLM4_INVALID 0x03
35 #define LMLM4_MPEG1L2 0x04
36
37 #define LMLM4_MAX_PACKET_SIZE 1024 * 1024
38
39 7128 static int lmlm4_probe(const AVProbeData *pd)
40 {
41 7128 const unsigned char *buf = pd->buf;
42 unsigned int frame_type, packet_size;
43
44 7128 frame_type = AV_RB16(buf + 2);
45 7128 packet_size = AV_RB32(buf + 4);
46
47
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 7128 if (!AV_RB16(buf) && frame_type <= LMLM4_MPEG1L2 && packet_size &&
48
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 485 frame_type != LMLM4_INVALID && packet_size <= LMLM4_MAX_PACKET_SIZE) {
49
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 1 if (frame_type == LMLM4_MPEG1L2) {
50
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 1 if ((AV_RB16(buf + 8) & 0xfffe) != 0xfffc)
51 ✗ return 0;
52 /* I could calculate the audio framesize and compare with
53 * packet_size-8, but that seems overkill */
54 1 return AVPROBE_SCORE_MAX / 3;
55 ✗ } else if (AV_RB24(buf + 8) == 0x000001) { /* PES Signal */
56 ✗ return AVPROBE_SCORE_MAX / 5;
57 }
58 }
59
60 7127 return 0;
61 }
62
63 1 static int lmlm4_read_header(AVFormatContext *s)
64 {
65 AVStream *st;
66
67
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 1 if (!(st = avformat_new_stream(s, NULL)))
68 ✗ return AVERROR(ENOMEM);
69 1 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
70 1 st->codecpar->codec_id = AV_CODEC_ID_MPEG4;
71 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
72 1 avpriv_set_pts_info(st, 64, 1001, 30000);
73
74
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 1 if (!(st = avformat_new_stream(s, NULL)))
75 ✗ return AVERROR(ENOMEM);
76 1 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
77 1 st->codecpar->codec_id = AV_CODEC_ID_MP2;
78 1 ffstream(st)->need_parsing = AVSTREAM_PARSE_HEADERS;
79
80 /* the parameters will be extracted from the compressed bitstream */
81 1 return 0;
82 }
83
84 243 static int lmlm4_read_packet(AVFormatContext *s, AVPacket *pkt)
85 {
86 243 AVIOContext *pb = s->pb;
87 int ret;
88 unsigned int frame_type, packet_size, padding, frame_size;
89
90 243 avio_rb16(pb); /* channel number */
91 243 frame_type = avio_rb16(pb);
92 243 packet_size = avio_rb32(pb);
93 243 padding = -packet_size & 511;
94 243 frame_size = packet_size - 8;
95
96
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 243 if (frame_type > LMLM4_MPEG1L2 || frame_type == LMLM4_INVALID) {
97 ✗ av_log(s, AV_LOG_ERROR, "invalid or unsupported frame_type\n");
98 ✗ return AVERROR(EIO);
99 }
100
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 243 if (packet_size > LMLM4_MAX_PACKET_SIZE || packet_size<=8) {
101 ✗ av_log(s, AV_LOG_ERROR, "packet size %d is invalid\n", packet_size);
102 ✗ return AVERROR(EIO);
103 }
104
105
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 243 if ((ret = av_get_packet(pb, pkt, frame_size)) <= 0)
106 ✗ return AVERROR(EIO);
107
108 243 avio_skip(pb, padding);
109
110
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 243 switch (frame_type) {
111 6 case LMLM4_I_FRAME:
112 6 pkt->flags = AV_PKT_FLAG_KEY;
113 93 case LMLM4_P_FRAME:
114 case LMLM4_B_FRAME:
115 93 pkt->stream_index = 0;
116 93 break;
117 150 case LMLM4_MPEG1L2:
118 150 pkt->stream_index = 1;
119 150 break;
120 }
121
122 243 return ret;
123 }
124
125 const FFInputFormat ff_lmlm4_demuxer = {
126 .p.name = "lmlm4",
127 .p.long_name = NULL_IF_CONFIG_SMALL("raw lmlm4"),
128 .read_probe = lmlm4_probe,
129 .read_header = lmlm4_read_header,
130 .read_packet = lmlm4_read_packet,
131 };
132