FFmpeg  4.4.5
jvdec.c
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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 
29 #include "libavutil/intreadwrite.h"
30 
31 #include "avformat.h"
32 #include "internal.h"
33 
34 #define JV_PREAMBLE_SIZE 5
35 
36 typedef struct JVFrame {
37  int audio_size; /**< audio packet size (bytes) */
38  int video_size; /**< video packet size (bytes) */
39  int palette_size; /**< palette size (bytes) */
40  int video_type; /**< per-frame video compression type */
41 } JVFrame;
42 
43 typedef struct JVDemuxContext {
45  enum {
46  JV_AUDIO = 0,
49  } state;
52 
53 #define MAGIC " Compression by John M Phillips Copyright (C) 1995 The Bitmap Brothers Ltd."
54 
55 static int read_probe(const AVProbeData *pd)
56 {
57  if (pd->buf[0] == 'J' && pd->buf[1] == 'V' && strlen(MAGIC) + 4 <= pd->buf_size &&
58  !memcmp(pd->buf + 4, MAGIC, strlen(MAGIC)))
59  return AVPROBE_SCORE_MAX;
60  return 0;
61 }
62 
64 {
65  JVDemuxContext *jv = s->priv_data;
66 
67  av_freep(&jv->frames);
68 
69  return 0;
70 }
71 
73 {
74  JVDemuxContext *jv = s->priv_data;
75  AVIOContext *pb = s->pb;
76  AVStream *vst, *ast;
77  int64_t audio_pts = 0;
79  int i;
80 
81  avio_skip(pb, 80);
82 
83  ast = avformat_new_stream(s, NULL);
84  vst = avformat_new_stream(s, NULL);
85  if (!ast || !vst)
86  return AVERROR(ENOMEM);
87 
90  vst->codecpar->codec_tag = 0; /* no fourcc */
91  vst->codecpar->width = avio_rl16(pb);
92  vst->codecpar->height = avio_rl16(pb);
93  vst->duration =
94  vst->nb_frames =
95  ast->nb_index_entries = avio_rl16(pb);
96  avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000);
97 
98  avio_skip(pb, 4);
99 
102  ast->codecpar->codec_tag = 0; /* no fourcc */
103  ast->codecpar->sample_rate = avio_rl16(pb);
104  ast->codecpar->channels = 1;
106  avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
107 
108  avio_skip(pb, 10);
109 
111  sizeof(*ast->index_entries));
112  if (!ast->index_entries)
113  return AVERROR(ENOMEM);
114 
115  jv->frames = av_malloc(ast->nb_index_entries * sizeof(JVFrame));
116  if (!jv->frames) {
117  av_freep(&ast->index_entries);
118  return AVERROR(ENOMEM);
119  }
120  offset = 0x68 + ast->nb_index_entries * 16;
121  for (i = 0; i < ast->nb_index_entries; i++) {
122  AVIndexEntry *e = ast->index_entries + i;
123  JVFrame *jvf = jv->frames + i;
124 
125  /* total frame size including audio, video, palette data and padding */
126  e->size = avio_rl32(pb);
127  e->timestamp = i;
128  e->pos = offset;
129  offset += e->size;
130 
131  jvf->audio_size = avio_rl32(pb);
132  jvf->video_size = avio_rl32(pb);
133  jvf->palette_size = avio_r8(pb) ? 768 : 0;
134 
135  if ((jvf->video_size | jvf->audio_size) & ~0xFFFFFF ||
136  e->size - jvf->audio_size
137  - jvf->video_size
138  - jvf->palette_size < 0) {
139  if (s->error_recognition & AV_EF_EXPLODE) {
140  read_close(s);
141  av_freep(&jv->frames);
142  av_freep(&ast->index_entries);
143  return AVERROR_INVALIDDATA;
144  }
145  jvf->audio_size =
146  jvf->video_size =
147  jvf->palette_size = 0;
148  }
149 
150  if (avio_r8(pb))
151  av_log(s, AV_LOG_WARNING, "unsupported audio codec\n");
152 
153  jvf->video_type = avio_r8(pb);
154  avio_skip(pb, 1);
155 
156  e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE;
157  audio_pts += jvf->audio_size;
158 
159  e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0;
160  }
161 
162  jv->state = JV_AUDIO;
163  return 0;
164 }
165 
167 {
168  JVDemuxContext *jv = s->priv_data;
169  AVIOContext *pb = s->pb;
170  AVStream *ast = s->streams[0];
171  int ret;
172 
173  while (!avio_feof(s->pb) && jv->pts < ast->nb_index_entries) {
174  const AVIndexEntry *e = ast->index_entries + jv->pts;
175  const JVFrame *jvf = jv->frames + jv->pts;
176 
177  switch (jv->state) {
178  case JV_AUDIO:
179  jv->state++;
180  if (jvf->audio_size) {
181  if ((ret = av_get_packet(s->pb, pkt, jvf->audio_size)) < 0)
182  return ret;
183  pkt->stream_index = 0;
184  pkt->pts = e->timestamp;
186  return 0;
187  }
188  case JV_VIDEO:
189  jv->state++;
190  if (jvf->video_size || jvf->palette_size) {
191  int size = jvf->video_size + jvf->palette_size;
192  if ((ret = av_new_packet(pkt, size + JV_PREAMBLE_SIZE)) < 0)
193  return ret;
194 
195  AV_WL32(pkt->data, jvf->video_size);
196  pkt->data[4] = jvf->video_type;
197  ret = avio_read(pb, pkt->data + JV_PREAMBLE_SIZE, size);
198  if (ret < 0)
199  return ret;
200  if (ret < size) {
201  memset(pkt->data + JV_PREAMBLE_SIZE + ret, 0,
204  }
205  pkt->size = ret + JV_PREAMBLE_SIZE;
206  pkt->stream_index = 1;
207  pkt->pts = jv->pts;
208  if (jvf->video_type != 1)
210  return 0;
211  }
212  case JV_PADDING:
213  avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size
214  - jvf->palette_size, 0));
215  jv->state = JV_AUDIO;
216  jv->pts++;
217  }
218  }
219 
220  if (s->pb->eof_reached)
221  return AVERROR_EOF;
222 
223  return AVERROR(EIO);
224 }
225 
226 static int read_seek(AVFormatContext *s, int stream_index,
227  int64_t ts, int flags)
228 {
229  JVDemuxContext *jv = s->priv_data;
230  AVStream *ast = s->streams[0];
231  int i;
232 
234  return AVERROR(ENOSYS);
235 
236  switch (stream_index) {
237  case 0:
238  i = av_index_search_timestamp(ast, ts, flags);
239  break;
240  case 1:
241  i = ts;
242  break;
243  default:
244  return 0;
245  }
246 
247  if (i < 0 || i >= ast->nb_index_entries)
248  return 0;
249  if (avio_seek(s->pb, ast->index_entries[i].pos, SEEK_SET) < 0)
250  return -1;
251 
252  jv->state = JV_AUDIO;
253  jv->pts = i;
254  return 0;
255 }
256 
258  .name = "jv",
259  .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"),
260  .priv_data_size = sizeof(JVDemuxContext),
264  .read_seek = read_seek,
266 };
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1656
Main libavformat public API header.
#define AVINDEX_KEYFRAME
Definition: avformat.h:811
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2416
int av_get_packet(AVIOContext *s, AVPacket *pkt, int size)
Allocate and read the payload of a packet and initialize its fields with default values.
Definition: utils.c:310
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2418
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:253
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:364
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:734
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:337
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:633
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:750
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:624
#define flags(name, subs,...)
Definition: cbs_av1.c:572
#define s(width, name)
Definition: cbs_vp9.c:257
audio channel layout utility functions
#define FFMAX(a, b)
Definition: common.h:103
#define NULL
Definition: coverity.c:32
long long int64_t
Definition: coverity.c:34
#define AV_CH_LAYOUT_MONO
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:318
@ AV_CODEC_ID_JV
Definition: codec_id.h:198
#define AV_INPUT_BUFFER_PADDING_SIZE
Required number of additionally allocated bytes at the end of the input bitstream for decoding.
Definition: avcodec.h:215
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: packet.h:411
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:410
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4509
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2130
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AVERROR_EOF
End of file.
Definition: error.h:55
#define AVERROR(e)
Definition: error.h:43
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
int i
Definition: input.c:407
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4945
#define JV_PREAMBLE_SIZE
Definition: jvdec.c:34
static int read_close(AVFormatContext *s)
Definition: jvdec.c:63
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: jvdec.c:166
static int read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
Definition: jvdec.c:226
AVInputFormat ff_jv_demuxer
Definition: jvdec.c:257
#define MAGIC
Definition: jvdec.c:53
static int read_header(AVFormatContext *s)
Definition: jvdec.c:72
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
int channels
Audio only.
Definition: codec_par.h:166
int width
Video only.
Definition: codec_par.h:126
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
int sample_rate
Audio only.
Definition: codec_par.h:170
Format I/O context.
Definition: avformat.h:1232
Bytestream IO Context.
Definition: avio.h:161
int64_t pos
Definition: avformat.h:804
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:805
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:645
This structure stores compressed data.
Definition: packet.h:346
int stream_index
Definition: packet.h:371
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:375
int size
Definition: packet.h:370
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:362
uint8_t * data
Definition: packet.h:369
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
Stream structure.
Definition: avformat.h:873
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1038
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:924
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:922
int nb_index_entries
Definition: avformat.h:1092
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1090
@ JV_PADDING
Definition: jvdec.c:48
int64_t pts
Definition: jvdec.c:50
JVFrame * frames
Definition: jvdec.c:44
enum JVDemuxContext::@262 state
Definition: jvdec.c:36
int palette_size
palette size (bytes)
Definition: jvdec.c:39
int audio_size
audio packet size (bytes)
Definition: jvdec.c:37
int video_size
video packet size (bytes)
Definition: jvdec.c:38
int video_type
per-frame video compression type
Definition: jvdec.c:40
#define av_freep(p)
#define av_malloc(s)
#define av_log(a,...)
AVPacket * pkt
Definition: movenc.c:59
int size
static const uint8_t offset[127][2]
Definition: vf_spp.c:107