FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/jvdec.c
Date: 2026-04-27 20:45:03
Exec Total Coverage
Lines: 101 136 74.3%
Functions: 4 5 80.0%
Branches: 35 67 52.2%
Line Branch Exec Source
1 /*
2 * Bitmap Brothers JV demuxer
3 * Copyright (c) 2005, 2011 Peter Ross <pross@xvid.org>
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 * Bitmap Brothers JV demuxer
25 * @author Peter Ross <pross@xvid.org>
26 */
27
28 #include "libavutil/channel_layout.h"
29 #include "libavutil/intreadwrite.h"
30 #include "libavutil/mem.h"
31
32 #include "avformat.h"
33 #include "demux.h"
34 #include "internal.h"
35
36 #define JV_PREAMBLE_SIZE 5
37
38 typedef struct JVFrame {
39 int audio_size; /**< audio packet size (bytes) */
40 int video_size; /**< video packet size (bytes) */
41 uint16_t palette_size; /**< palette size (bytes) */
42 uint8_t video_type; /**< per-frame video compression type */
43 } JVFrame;
44
45 typedef struct JVDemuxContext {
46 JVFrame *frames;
47 enum {
48 JV_AUDIO = 0,
49 JV_VIDEO,
50 JV_PADDING
51 } state;
52 int64_t pts;
53 } JVDemuxContext;
54
55 #define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd."
56
57 7480 static int read_probe(const AVProbeData *pd)
58 {
59
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 7480 if (pd->buf[0] == 'J' && pd->buf[1] == 'V' && strlen(MAGIC) + 4 <= pd->buf_size &&
60
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 2 !memcmp(pd->buf + 4, MAGIC, strlen(MAGIC)))
61 2 return AVPROBE_SCORE_MAX;
62 7478 return 0;
63 }
64
65 2 static int read_close(AVFormatContext *s)
66 {
67 2 JVDemuxContext *jv = s->priv_data;
68
69 2 av_freep(&jv->frames);
70
71 2 return 0;
72 }
73
74 2 static int read_header(AVFormatContext *s)
75 {
76 2 JVDemuxContext *jv = s->priv_data;
77 2 AVIOContext *pb = s->pb;
78 AVStream *vst, *ast;
79 FFStream *asti;
80 2 int64_t audio_pts = 0;
81 int64_t offset;
82
83 2 avio_skip(pb, 80);
84
85 2 ast = avformat_new_stream(s, NULL);
86 2 vst = avformat_new_stream(s, NULL);
87
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 2 if (!ast || !vst)
88 ✗ return AVERROR(ENOMEM);
89 2 asti = ffstream(ast);
90
91 2 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
92 2 vst->codecpar->codec_id = AV_CODEC_ID_JV;
93 2 vst->codecpar->codec_tag = 0; /* no fourcc */
94 2 vst->codecpar->width = avio_rl16(pb);
95 2 vst->codecpar->height = avio_rl16(pb);
96 2 vst->duration =
97 2 vst->nb_frames =
98 2 asti->nb_index_entries = avio_rl16(pb);
99 2 avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000);
100
101 2 avio_skip(pb, 4);
102
103 2 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
104 2 ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
105 2 ast->codecpar->codec_tag = 0; /* no fourcc */
106 2 ast->codecpar->sample_rate = avio_rl16(pb);
107 2 ast->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
108 2 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
109
110 2 avio_skip(pb, 10);
111
112 2 asti->index_entries = av_malloc(asti->nb_index_entries *
113 sizeof(*asti->index_entries));
114
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 2 if (!asti->index_entries)
115 ✗ return AVERROR(ENOMEM);
116
117 2 jv->frames = av_malloc(asti->nb_index_entries * sizeof(*jv->frames));
118
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 2 if (!jv->frames)
119 ✗ return AVERROR(ENOMEM);
120 2 offset = 0x68 + asti->nb_index_entries * 16;
121
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 4022 for (int i = 0; i < asti->nb_index_entries; i++) {
122 4020 AVIndexEntry *e = asti->index_entries + i;
123 4020 JVFrame *jvf = jv->frames + i;
124
125 /* total frame size including audio, video, palette data and padding */
126 4020 e->size = avio_rl32(pb);
127 4020 e->timestamp = i;
128 4020 e->pos = offset;
129 4020 offset += e->size;
130
131 4020 jvf->audio_size = avio_rl32(pb);
132 4020 jvf->video_size = avio_rl32(pb);
133
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 4020 jvf->palette_size = avio_r8(pb) ? 768 : 0;
134
135
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 4020 if ((jvf->video_size | jvf->audio_size) & ~0xFFFFFF ||
136 4020 e->size - jvf->audio_size
137 4020 - jvf->video_size
138
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 4020 - jvf->palette_size < 0) {
139 ✗ if (s->error_recognition & AV_EF_EXPLODE)
140 ✗ return AVERROR_INVALIDDATA;
141 ✗ jvf->audio_size =
142 ✗ jvf->video_size =
143 ✗ jvf->palette_size = 0;
144 }
145
146
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 4020 if (avio_r8(pb))
147 ✗ av_log(s, AV_LOG_WARNING, "unsupported audio codec\n");
148
149 4020 jvf->video_type = avio_r8(pb);
150 4020 avio_skip(pb, 1);
151
152
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 4020 e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE;
153 4020 audio_pts += jvf->audio_size;
154
155 4020 e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0;
156 }
157
158 2 jv->state = JV_AUDIO;
159 2 return 0;
160 }
161
162 38 static int read_packet(AVFormatContext *s, AVPacket *pkt)
163 {
164 38 JVDemuxContext *jv = s->priv_data;
165 38 AVIOContext *pb = s->pb;
166 38 AVStream *ast = s->streams[0];
167 38 FFStream *const asti = ffstream(ast);
168 int ret;
169
170
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 92 while (!avio_feof(s->pb) && jv->pts < asti->nb_index_entries) {
171 52 const AVIndexEntry *const e = asti->index_entries + jv->pts;
172 52 const JVFrame *jvf = jv->frames + jv->pts;
173
174
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 52 switch (jv->state) {
175 18 case JV_AUDIO:
176 18 jv->state++;
177
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 18 if (jvf->audio_size) {
178
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 18 if ((ret = av_get_packet(s->pb, pkt, jvf->audio_size)) < 0)
179 ✗ return ret;
180 18 pkt->stream_index = 0;
181 18 pkt->pts = e->timestamp;
182 18 pkt->flags |= AV_PKT_FLAG_KEY;
183 18 return 0;
184 }
185 case JV_VIDEO:
186 18 jv->state++;
187
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 18 if (jvf->video_size || jvf->palette_size) {
188 18 int size = jvf->video_size + jvf->palette_size;
189
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 18 if ((ret = av_new_packet(pkt, size + JV_PREAMBLE_SIZE)) < 0)
190 ✗ return ret;
191
192 18 AV_WL32(pkt->data, jvf->video_size);
193 18 pkt->data[4] = jvf->video_type;
194 18 ret = avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size);
195
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 18 if (ret < 0)
196 ✗ return ret;
197
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 18 if (ret < size) {
198 2 memset(pkt->data + JV_PREAMBLE_SIZE + ret, 0,
199 AV_INPUT_BUFFER_PADDING_SIZE);
200 2 pkt->flags |= AV_PKT_FLAG_CORRUPT;
201 }
202 18 pkt->size = ret + JV_PREAMBLE_SIZE;
203 18 pkt->stream_index = 1;
204 18 pkt->pts = jv->pts;
205
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 18 if (jvf->video_type != 1)
206 4 pkt->flags |= AV_PKT_FLAG_KEY;
207 18 return 0;
208 }
209 case JV_PADDING:
210 16 avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size
211 - jvf->palette_size, 0));
212 16 jv->state = JV_AUDIO;
213 16 jv->pts++;
214 }
215 }
216
217
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 2 if (s->pb->eof_reached)
218 2 return AVERROR_EOF;
219
220 ✗ return AVERROR_INVALIDDATA;
221 }
222
223 ✗ static int read_seek(AVFormatContext *s, int stream_index,
224 int64_t ts, int flags)
225 {
226 ✗ JVDemuxContext *jv = s->priv_data;
227 ✗ AVStream *ast = s->streams[0];
228 ✗ FFStream *const asti = ffstream(ast);
229 int i;
230
231 ✗ if (flags & (AVSEEK_FLAG_BYTE | AVSEEK_FLAG_FRAME))
232 ✗ return AVERROR(ENOSYS);
233
234 ✗ switch (stream_index) {
235 ✗ case 0:
236 ✗ i = av_index_search_timestamp(ast, ts, flags);
237 ✗ break;
238 ✗ case 1:
239 ✗ i = ts;
240 ✗ break;
241 ✗ default:
242 ✗ return 0;
243 }
244
245 ✗ if (i < 0 || i >= asti->nb_index_entries)
246 ✗ return 0;
247 ✗ if (avio_seek(s->pb, asti->index_entries[i].pos, SEEK_SET) < 0)
248 ✗ return -1;
249
250 ✗ jv->state = JV_AUDIO;
251 ✗ jv->pts = i;
252 ✗ return 0;
253 }
254
255 const FFInputFormat ff_jv_demuxer = {
256 .p.name = "jv",
257 .p.long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"),
258 .priv_data_size = sizeof(JVDemuxContext),
259 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
260 .read_probe = read_probe,
261 .read_header = read_header,
262 .read_packet = read_packet,
263 .read_seek = read_seek,
264 .read_close = read_close,
265 };
266