FFmpeg
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;
50  int64_t pts;
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;
78  int64_t offset;
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 =
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->internal->index_entries));
112  if (!ast->internal->index_entries)
113  return AVERROR(ENOMEM);
114 
115  jv->frames = av_malloc(ast->internal->nb_index_entries * sizeof(JVFrame));
116  if (!jv->frames) {
118  return AVERROR(ENOMEM);
119  }
120  offset = 0x68 + ast->internal->nb_index_entries * 16;
121  for (i = 0; i < ast->internal->nb_index_entries; i++) {
122  AVIndexEntry *e = ast->internal->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);
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->internal->nb_index_entries) {
174  const AVIndexEntry *e = ast->internal->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;
198  if (ret < 0)
199  return ret;
200  if (ret < size) {
201  memset(pkt->data + JV_PREAMBLE_SIZE + ret, 0,
204  }
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->internal->nb_index_entries)
248  return 0;
249  if (avio_seek(s->pb, ast->internal->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 };
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:187
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4372
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
AV_WL32
#define AV_WL32(p, v)
Definition: intreadwrite.h:426
AVSEEK_FLAG_FRAME
#define AVSEEK_FLAG_FRAME
seeking based on frame number
Definition: avformat.h:2159
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
AVPacket::data
uint8_t * data
Definition: packet.h:365
AVStream::internal
AVStreamInternal * internal
An opaque field for libavformat internal usage.
Definition: avformat.h:1008
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2157
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
AVProbeData::buf_size
int buf_size
Size of buf except extra allocated bytes.
Definition: avformat.h:444
JVFrame
Definition: jvdec.c:36
JVFrame::video_size
int video_size
video packet size (bytes)
Definition: jvdec.c:38
JVFrame::video_type
int video_type
per-frame video compression type
Definition: jvdec.c:40
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:396
AVIndexEntry
Definition: avformat.h:762
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:770
JVDemuxContext::JV_PADDING
@ JV_PADDING
Definition: jvdec.c:48
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:453
ff_jv_demuxer
const AVInputFormat ff_jv_demuxer
Definition: jvdec.c:257
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
JVDemuxContext::JV_VIDEO
@ JV_VIDEO
Definition: jvdec.c:47
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:875
JVDemuxContext::pts
int64_t pts
Definition: jvdec.c:50
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:717
read_close
static int read_close(AVFormatContext *s)
Definition: jvdec.c:63
JVDemuxContext::JV_AUDIO
@ JV_AUDIO
Definition: jvdec.c:46
pkt
AVPacket * pkt
Definition: movenc.c:59
JVFrame::audio_size
int audio_size
audio packet size (bytes)
Definition: jvdec.c:37
AVInputFormat
Definition: avformat.h:616
AV_PKT_FLAG_CORRUPT
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: packet.h:397
intreadwrite.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:94
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:621
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:443
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
AVIndexEntry::size
int size
Definition: avformat.h:773
AVIndexEntry::timestamp
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:764
JVDemuxContext::state
enum JVDemuxContext::@262 state
AVFormatContext
Format I/O context.
Definition: avformat.h:1106
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:979
read_packet
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: jvdec.c:166
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
AVIndexEntry::flags
int flags
Definition: avformat.h:772
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:441
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1441
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
AVStream::nb_frames
int64_t nb_frames
number of frames in this stream if known or 0
Definition: avformat.h:877
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:733
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
AVPacket::size
int size
Definition: packet.h:366
MAGIC
#define MAGIC
Definition: jvdec.c:53
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
FFMAX
#define FFMAX(a, b)
Definition: common.h:103
avpriv_set_pts_info
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:4797
size
int size
Definition: twinvq_data.h:10344
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
AVStreamInternal::nb_index_entries
int nb_index_entries
Definition: internal.h:252
JVFrame::palette_size
int palette_size
palette size (bytes)
Definition: jvdec.c:39
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:607
AVStreamInternal::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:250
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:371
JV_PREAMBLE_SIZE
#define JV_PREAMBLE_SIZE
Definition: jvdec.c:34
read_header
static int read_header(AVFormatContext *s)
Definition: jvdec.c:72
read_seek
static int read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
Definition: jvdec.c:226
i
int i
Definition: input.c:407
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:358
AVCodecParameters::height
int height
Definition: codec_par.h:127
av_get_packet
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:280
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:832
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:243
avformat.h
AV_CODEC_ID_JV
@ AV_CODEC_ID_JV
Definition: codec_id.h:198
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: avcodec.h:192
channel_layout.h
avio_read
int avio_read(AVIOContext *s, unsigned char *buf, int size)
Read size bytes from AVIOContext into buf.
Definition: aviobuf.c:616
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:763
AVPacket::stream_index
int stream_index
Definition: packet.h:367
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:327
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_CODEC_ID_PCM_U8
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:317
JVDemuxContext::frames
JVFrame * frames
Definition: jvdec.c:44
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:342
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
JVDemuxContext
Definition: jvdec.c:43
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
av_index_search_timestamp
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2054
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:354