FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/smjpegdec.c
Date: 2025-10-30 16:00:47
Exec Total Coverage
Lines: 96 117 82.1%
Functions: 3 3 100.0%
Branches: 25 41 61.0%
Line Branch Exec Source
1 /*
2 * SMJPEG demuxer
3 * Copyright (c) 2011 Paul B Mahol
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 /**
23 * @file
24 * This is a demuxer for Loki SDL Motion JPEG files
25 */
26
27 #include <inttypes.h>
28
29 #include "libavutil/mem.h"
30 #include "avformat.h"
31 #include "demux.h"
32 #include "internal.h"
33 #include "smjpeg.h"
34
35 typedef struct SMJPEGContext {
36 int audio_stream_index;
37 int video_stream_index;
38 } SMJPEGContext;
39
40 7282 static int smjpeg_probe(const AVProbeData *p)
41 {
42
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 7282 if (!memcmp(p->buf, SMJPEG_MAGIC, 8))
43 5 return AVPROBE_SCORE_MAX;
44 7277 return 0;
45 }
46
47 5 static int smjpeg_read_header(AVFormatContext *s)
48 {
49 5 SMJPEGContext *sc = s->priv_data;
50 5 AVStream *ast = NULL, *vst = NULL;
51 5 AVIOContext *pb = s->pb;
52 uint32_t version, htype, hlength, duration;
53 char *comment;
54
55 5 sc->audio_stream_index =
56 5 sc->video_stream_index = -1;
57
58 5 avio_skip(pb, 8); // magic
59 5 version = avio_rb32(pb);
60
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 5 if (version)
61 ✗ avpriv_request_sample(s, "Unknown version %"PRIu32, version);
62
63 5 duration = avio_rb32(pb); // in msec
64
65
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 16 while (!avio_feof(pb)) {
66 16 htype = avio_rl32(pb);
67
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 16 switch (htype) {
68 1 case SMJPEG_TXT:
69 1 hlength = avio_rb32(pb);
70
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 1 if (!hlength || hlength > 512)
71 ✗ return AVERROR_INVALIDDATA;
72 1 comment = av_malloc(hlength + 1);
73
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 1 if (!comment)
74 ✗ return AVERROR(ENOMEM);
75
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 1 if (avio_read(pb, comment, hlength) != hlength) {
76 ✗ av_freep(&comment);
77 ✗ av_log(s, AV_LOG_ERROR, "error when reading comment\n");
78 ✗ return AVERROR_INVALIDDATA;
79 }
80 1 comment[hlength] = 0;
81 1 av_dict_set(&s->metadata, "comment", comment,
82 AV_DICT_DONT_STRDUP_VAL);
83 1 break;
84 5 case SMJPEG_SND:
85
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 5 if (ast) {
86 ✗ avpriv_request_sample(s, "Multiple audio streams");
87 ✗ return AVERROR_PATCHWELCOME;
88 }
89 5 hlength = avio_rb32(pb);
90
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 5 if (hlength < 8)
91 ✗ return AVERROR_INVALIDDATA;
92 5 ast = avformat_new_stream(s, 0);
93
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 5 if (!ast)
94 ✗ return AVERROR(ENOMEM);
95 5 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
96 5 ast->codecpar->sample_rate = avio_rb16(pb);
97 5 ast->codecpar->bits_per_coded_sample = avio_r8(pb);
98 5 ast->codecpar->ch_layout.nb_channels = avio_r8(pb);
99 5 ast->codecpar->codec_tag = avio_rl32(pb);
100 10 ast->codecpar->codec_id = ff_codec_get_id(ff_codec_smjpeg_audio_tags,
101 5 ast->codecpar->codec_tag);
102 5 ast->duration = duration;
103 5 sc->audio_stream_index = ast->index;
104 5 avpriv_set_pts_info(ast, 32, 1, 1000);
105 5 avio_skip(pb, hlength - 8);
106 5 break;
107 5 case SMJPEG_VID:
108
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 5 if (vst) {
109 ✗ avpriv_request_sample(s, "Multiple video streams");
110 ✗ return AVERROR_INVALIDDATA;
111 }
112 5 hlength = avio_rb32(pb);
113
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 5 if (hlength < 12)
114 ✗ return AVERROR_INVALIDDATA;
115 5 vst = avformat_new_stream(s, 0);
116
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 5 if (!vst)
117 ✗ return AVERROR(ENOMEM);
118 5 vst->nb_frames = avio_rb32(pb);
119 5 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
120 5 vst->codecpar->width = avio_rb16(pb);
121 5 vst->codecpar->height = avio_rb16(pb);
122 5 vst->codecpar->codec_tag = avio_rl32(pb);
123 10 vst->codecpar->codec_id = ff_codec_get_id(ff_codec_smjpeg_video_tags,
124 5 vst->codecpar->codec_tag);
125 5 vst->duration = duration;
126 5 sc->video_stream_index = vst->index;
127 5 avpriv_set_pts_info(vst, 32, 1, 1000);
128 5 avio_skip(pb, hlength - 12);
129 5 break;
130 5 case SMJPEG_HEND:
131 5 return 0;
132 ✗ default:
133 ✗ av_log(s, AV_LOG_ERROR, "unknown header %"PRIx32"\n", htype);
134 ✗ return AVERROR_INVALIDDATA;
135 }
136 }
137
138 ✗ return AVERROR_EOF;
139 }
140
141 1552 static int smjpeg_read_packet(AVFormatContext *s, AVPacket *pkt)
142 {
143 1552 SMJPEGContext *sc = s->priv_data;
144 uint32_t dtype, size, timestamp;
145 int64_t pos;
146 int ret;
147
148
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 1552 if (avio_feof(s->pb))
149 ✗ return AVERROR_EOF;
150 1552 pos = avio_tell(s->pb);
151 1552 dtype = avio_rl32(s->pb);
152
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 1552 switch (dtype) {
153 1262 case SMJPEG_SNDD:
154
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 1262 if (sc->audio_stream_index < 0)
155 ✗ return AVERROR_INVALIDDATA;
156 1262 timestamp = avio_rb32(s->pb);
157 1262 size = avio_rb32(s->pb);
158 1262 ret = av_get_packet(s->pb, pkt, size);
159 1262 pkt->stream_index = sc->audio_stream_index;
160 1262 pkt->pts = timestamp;
161 1262 pkt->pos = pos;
162 1262 break;
163 285 case SMJPEG_VIDD:
164
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 285 if (sc->video_stream_index < 0)
165 ✗ return AVERROR_INVALIDDATA;
166 285 timestamp = avio_rb32(s->pb);
167 285 size = avio_rb32(s->pb);
168 285 ret = av_get_packet(s->pb, pkt, size);
169 285 pkt->stream_index = sc->video_stream_index;
170 285 pkt->pts = timestamp;
171 285 pkt->pos = pos;
172 285 break;
173 4 case SMJPEG_DONE:
174 4 ret = AVERROR_EOF;
175 4 break;
176 1 default:
177 1 av_log(s, AV_LOG_ERROR, "unknown chunk %"PRIx32"\n", dtype);
178 1 ret = AVERROR_INVALIDDATA;
179 1 break;
180 }
181 1552 return ret;
182 }
183
184 const FFInputFormat ff_smjpeg_demuxer = {
185 .p.name = "smjpeg",
186 .p.long_name = NULL_IF_CONFIG_SMALL("Loki SDL MJPEG"),
187 .p.extensions = "mjpg",
188 .p.flags = AVFMT_GENERIC_INDEX,
189 .priv_data_size = sizeof(SMJPEGContext),
190 .read_probe = smjpeg_probe,
191 .read_header = smjpeg_read_header,
192 .read_packet = smjpeg_read_packet,
193 };
194