FFmpeg
jvdec.c
Go to the documentation of this file.
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  FFStream *asti;
78  int64_t audio_pts = 0;
79  int64_t offset;
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  asti = ffstream(ast);
88 
91  vst->codecpar->codec_tag = 0; /* no fourcc */
92  vst->codecpar->width = avio_rl16(pb);
93  vst->codecpar->height = avio_rl16(pb);
94  vst->duration =
95  vst->nb_frames =
96  asti->nb_index_entries = avio_rl16(pb);
97  avpriv_set_pts_info(vst, 64, avio_rl16(pb), 1000);
98 
99  avio_skip(pb, 4);
100 
103  ast->codecpar->codec_tag = 0; /* no fourcc */
104  ast->codecpar->sample_rate = avio_rl16(pb);
105  ast->codecpar->channels = 1;
107  avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
108 
109  avio_skip(pb, 10);
110 
112  sizeof(*asti->index_entries));
113  if (!asti->index_entries)
114  return AVERROR(ENOMEM);
115 
116  jv->frames = av_malloc(asti->nb_index_entries * sizeof(*jv->frames));
117  if (!jv->frames)
118  return AVERROR(ENOMEM);
119  offset = 0x68 + asti->nb_index_entries * 16;
120  for (int i = 0; i < asti->nb_index_entries; i++) {
121  AVIndexEntry *e = asti->index_entries + i;
122  JVFrame *jvf = jv->frames + i;
123 
124  /* total frame size including audio, video, palette data and padding */
125  e->size = avio_rl32(pb);
126  e->timestamp = i;
127  e->pos = offset;
128  offset += e->size;
129 
130  jvf->audio_size = avio_rl32(pb);
131  jvf->video_size = avio_rl32(pb);
132  jvf->palette_size = avio_r8(pb) ? 768 : 0;
133 
134  if ((jvf->video_size | jvf->audio_size) & ~0xFFFFFF ||
135  e->size - jvf->audio_size
136  - jvf->video_size
137  - jvf->palette_size < 0) {
138  if (s->error_recognition & AV_EF_EXPLODE)
139  return AVERROR_INVALIDDATA;
140  jvf->audio_size =
141  jvf->video_size =
142  jvf->palette_size = 0;
143  }
144 
145  if (avio_r8(pb))
146  av_log(s, AV_LOG_WARNING, "unsupported audio codec\n");
147 
148  jvf->video_type = avio_r8(pb);
149  avio_skip(pb, 1);
150 
151  e->timestamp = jvf->audio_size ? audio_pts : AV_NOPTS_VALUE;
152  audio_pts += jvf->audio_size;
153 
154  e->flags = jvf->video_type != 1 ? AVINDEX_KEYFRAME : 0;
155  }
156 
157  jv->state = JV_AUDIO;
158  return 0;
159 }
160 
162 {
163  JVDemuxContext *jv = s->priv_data;
164  AVIOContext *pb = s->pb;
165  AVStream *ast = s->streams[0];
166  FFStream *const asti = ffstream(ast);
167  int ret;
168 
169  while (!avio_feof(s->pb) && jv->pts < asti->nb_index_entries) {
170  const AVIndexEntry *const e = asti->index_entries + jv->pts;
171  const JVFrame *jvf = jv->frames + jv->pts;
172 
173  switch (jv->state) {
174  case JV_AUDIO:
175  jv->state++;
176  if (jvf->audio_size) {
177  if ((ret = av_get_packet(s->pb, pkt, jvf->audio_size)) < 0)
178  return ret;
179  pkt->stream_index = 0;
180  pkt->pts = e->timestamp;
182  return 0;
183  }
184  case JV_VIDEO:
185  jv->state++;
186  if (jvf->video_size || jvf->palette_size) {
187  int size = jvf->video_size + jvf->palette_size;
188  if ((ret = av_new_packet(pkt, size + JV_PREAMBLE_SIZE)) < 0)
189  return ret;
190 
191  AV_WL32(pkt->data, jvf->video_size);
192  pkt->data[4] = jvf->video_type;
194  if (ret < 0)
195  return ret;
196  if (ret < size) {
197  memset(pkt->data + JV_PREAMBLE_SIZE + ret, 0,
200  }
202  pkt->stream_index = 1;
203  pkt->pts = jv->pts;
204  if (jvf->video_type != 1)
206  return 0;
207  }
208  case JV_PADDING:
209  avio_skip(pb, FFMAX(e->size - jvf->audio_size - jvf->video_size
210  - jvf->palette_size, 0));
211  jv->state = JV_AUDIO;
212  jv->pts++;
213  }
214  }
215 
216  if (s->pb->eof_reached)
217  return AVERROR_EOF;
218 
219  return AVERROR(EIO);
220 }
221 
222 static int read_seek(AVFormatContext *s, int stream_index,
223  int64_t ts, int flags)
224 {
225  JVDemuxContext *jv = s->priv_data;
226  AVStream *ast = s->streams[0];
227  FFStream *const asti = ffstream(ast);
228  int i;
229 
231  return AVERROR(ENOSYS);
232 
233  switch (stream_index) {
234  case 0:
235  i = av_index_search_timestamp(ast, ts, flags);
236  break;
237  case 1:
238  i = ts;
239  break;
240  default:
241  return 0;
242  }
243 
244  if (i < 0 || i >= asti->nb_index_entries)
245  return 0;
246  if (avio_seek(s->pb, asti->index_entries[i].pos, SEEK_SET) < 0)
247  return -1;
248 
249  jv->state = JV_AUDIO;
250  jv->pts = i;
251  return 0;
252 }
253 
255  .name = "jv",
256  .long_name = NULL_IF_CONFIG_SMALL("Bitmap Brothers JV"),
257  .priv_data_size = sizeof(JVDemuxContext),
258  .flags_internal = FF_FMT_INIT_CLEANUP,
262  .read_seek = read_seek,
264 };
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:186
FF_FMT_INIT_CLEANUP
#define FF_FMT_INIT_CLEANUP
For an AVInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: internal.h:48
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:724
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:2154
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AV_CH_LAYOUT_MONO
#define AV_CH_LAYOUT_MONO
Definition: channel_layout.h:90
AVPacket::data
uint8_t * data
Definition: packet.h:373
AVSEEK_FLAG_BYTE
#define AVSEEK_FLAG_BYTE
seeking based on position in bytes
Definition: avformat.h:2152
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:449
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
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:425
AVIndexEntry
Definition: avformat.h:777
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
AVINDEX_KEYFRAME
#define AVINDEX_KEYFRAME
Definition: avformat.h:785
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
ff_jv_demuxer
const AVInputFormat ff_jv_demuxer
Definition: jvdec.c:254
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:426
JVDemuxContext::JV_PADDING
@ JV_PADDING
Definition: jvdec.c:48
AVStream::duration
int64_t duration
Decoding: duration of the stream, in stream time base.
Definition: avformat.h:888
JVDemuxContext::pts
int64_t pts
Definition: jvdec.c:50
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:726
read_close
static int read_close(AVFormatContext *s)
Definition: jvdec.c:63
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:626
AV_PKT_FLAG_CORRUPT
#define AV_PKT_FLAG_CORRUPT
The packet content is corrupted.
Definition: packet.h:426
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:99
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:631
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
JVDemuxContext::JV_VIDEO
@ JV_VIDEO
Definition: jvdec.c:47
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:788
AVIndexEntry::timestamp
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:779
AVFormatContext
Format I/O context.
Definition: avformat.h:1097
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:992
read_packet
static int read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: jvdec.c:161
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:787
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:273
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
JVDemuxContext::state
enum JVDemuxContext::@259 state
AV_EF_EXPLODE
#define AV_EF_EXPLODE
abort decoding on minor error detection
Definition: avcodec.h:1331
JVDemuxContext::JV_AUDIO
@ JV_AUDIO
Definition: jvdec.c:46
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:890
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:742
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
AVPacket::size
int size
Definition: packet.h:374
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
FFStream
Definition: internal.h:188
size
int size
Definition: twinvq_data.h:10344
AV_NOPTS_VALUE
#define AV_NOPTS_VALUE
Undefined timestamp value.
Definition: avutil.h:248
JVFrame::palette_size
int palette_size
palette size (bytes)
Definition: jvdec.c:39
avio_r8
int avio_r8(AVIOContext *s)
Definition: aviobuf.c:616
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:379
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:222
i
int i
Definition: input.c:406
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:366
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:196
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:845
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
avformat.h
AV_CODEC_ID_JV
@ AV_CODEC_ID_JV
Definition: codec_id.h:199
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
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:625
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:778
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, 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:1146
AVPacket::stream_index
int stream_index
Definition: packet.h:375
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:333
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:271
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
AV_CODEC_ID_PCM_U8
@ AV_CODEC_ID_PCM_U8
Definition: codec_id.h:318
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:350
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:61
av_index_search_timestamp
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: seek.c:237
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:360