FFmpeg
ifv.c
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1 /*
2  * IFV demuxer
3  *
4  * Copyright (c) 2019 Swaraj Hota
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
24 #include "avformat.h"
25 #include "internal.h"
26 #include "avio_internal.h"
27 
28 typedef struct IFVContext {
29  uint32_t next_video_index;
30  uint32_t next_audio_index;
31  uint32_t total_vframes;
32  uint32_t total_aframes;
33 
34  int width, height;
37 
40 } IFVContext;
41 
42 static int ifv_probe(const AVProbeData *p)
43 {
44  static const uint8_t ifv_magic[] = {0x11, 0xd2, 0xd3, 0xab, 0xba, 0xa9,
45  0xcf, 0x11, 0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65, 0x44};
46 
47  if (!memcmp(p->buf, ifv_magic, sizeof(ifv_magic)))
48  return AVPROBE_SCORE_MAX;
49 
50  return 0;
51 }
52 
55  uint32_t start_index)
56 {
57  IFVContext *ifv = s->priv_data;
58  AVStream *st;
59  int64_t pos, size, timestamp;
60  uint32_t end_index, i;
61  int ret;
62 
64  end_index = ifv->total_vframes;
65  st = s->streams[ifv->video_stream_index];
66  } else {
67  end_index = ifv->total_aframes;
68  st = s->streams[ifv->audio_stream_index];
69  }
70 
71  for (i = start_index; i < end_index; i++) {
72  if (avio_feof(s->pb))
73  return AVERROR_EOF;
74  pos = avio_rl32(s->pb);
75  size = avio_rl32(s->pb);
76 
77  avio_skip(s->pb, 8);
78  timestamp = avio_rl32(s->pb);
79 
80  ret = av_add_index_entry(st, pos, timestamp, size, 0, 0);
81  if (ret < 0)
82  return ret;
83 
84  avio_skip(s->pb, frame_type == AVMEDIA_TYPE_VIDEO ? 8: 4);
85  }
86 
87  return 0;
88 }
89 
91 {
92  IFVContext *ifv = s->priv_data;
93  uint32_t aud_magic;
94  uint32_t vid_magic;
95 
96  avio_skip(s->pb, 0x34);
97  avpriv_dict_set_timestamp(&s->metadata, "creation_time", avio_rl32(s->pb) * 1000000LL);
98  avio_skip(s->pb, 0x24);
99 
100  ifv->width = avio_rl16(s->pb);
101  ifv->height = avio_rl16(s->pb);
102 
103  avio_skip(s->pb, 0x8);
104  vid_magic = avio_rl32(s->pb);
105 
106  if (vid_magic != MKTAG('H','2','6','4'))
107  avpriv_request_sample(s, "Unknown video codec %x", vid_magic);
108 
109  avio_skip(s->pb, 0x2c);
110  ifv->sample_rate = avio_rl32(s->pb);
111  aud_magic = avio_rl32(s->pb);
112 
113  if (aud_magic == MKTAG('G','R','A','W')) {
114  ifv->is_audio_present = 1;
115  } else if (aud_magic == MKTAG('P','C','M','U')) {
116  ifv->is_audio_present = 0;
117  } else {
118  avpriv_request_sample(s, "Unknown audio codec %x", aud_magic);
119  }
120 
121  avio_skip(s->pb, 0x44);
122  ifv->total_vframes = avio_rl32(s->pb);
123  ifv->total_aframes = avio_rl32(s->pb);
124 
125  return 0;
126 }
127 
129 {
130  IFVContext *ifv = s->priv_data;
131  AVStream *st;
132  int ret;
133 
134  ret = parse_header(s);
135  if (ret < 0)
136  return ret;
137 
138  st = avformat_new_stream(s, NULL);
139  if (!st)
140  return AVERROR(ENOMEM);
141 
144  st->codecpar->width = ifv->width;
145  st->codecpar->height = ifv->height;
146  st->start_time = 0;
147  ifv->video_stream_index = st->index;
148 
149  avpriv_set_pts_info(st, 32, 1, 1000);
150 
151  if (ifv->is_audio_present) {
152  st = avformat_new_stream(s, NULL);
153  if (!st)
154  return AVERROR(ENOMEM);
155 
159  st->codecpar->sample_rate = ifv->sample_rate;
160  ifv->audio_stream_index = st->index;
161 
162  avpriv_set_pts_info(st, 32, 1, 1000);
163  }
164 
165  /*read video index*/
166  avio_seek(s->pb, 0xf8, SEEK_SET);
167 
169  if (ret < 0)
170  return ret;
171 
172  if (ifv->is_audio_present) {
173  /*read audio index*/
174  avio_seek(s->pb, 0x14918, SEEK_SET);
175 
177  if (ret < 0)
178  return ret;
179  }
180 
181  ifv->next_video_index = 0;
182  ifv->next_audio_index = 0;
183 
184  return 0;
185 }
186 
188 {
189  IFVContext *ifv = s->priv_data;
190  AVIndexEntry *ev, *ea, *e_next;
191  int ret;
192 
193  ev = ea = e_next = NULL;
194 
195  if (ifv->next_video_index < ifv->total_vframes) {
196  AVStream *const st = s->streams[ifv->video_stream_index];
197  FFStream *const sti = ffstream(st);
198 
199  if (ifv->next_video_index < sti->nb_index_entries)
200  e_next = ev = &sti->index_entries[ifv->next_video_index];
201  }
202 
203  if (ifv->is_audio_present &&
204  ifv->next_audio_index < ifv->total_aframes) {
205  AVStream *const st = s->streams[ifv->audio_stream_index];
206  FFStream *const sti = ffstream(st);
207 
208  if (ifv->next_audio_index < sti->nb_index_entries) {
209  ea = &sti->index_entries[ifv->next_audio_index];
210  if (!ev || ea->timestamp < ev->timestamp)
211  e_next = ea;
212  }
213  }
214 
215  if (!ev) {
216  uint64_t vframes, aframes;
217  if (ifv->is_audio_present && !ea) {
218  /*read new video and audio indexes*/
219 
220  ifv->next_video_index = ifv->total_vframes;
221  ifv->next_audio_index = ifv->total_aframes;
222 
223  avio_skip(s->pb, 0x1c);
224  vframes = ifv->total_vframes + (uint64_t)avio_rl32(s->pb);
225  aframes = ifv->total_aframes + (uint64_t)avio_rl32(s->pb);
226  if (vframes > INT_MAX || aframes > INT_MAX)
227  return AVERROR_INVALIDDATA;
228  ifv->total_vframes = vframes;
229  ifv->total_aframes = aframes;
230  avio_skip(s->pb, 0xc);
231 
232  if (avio_feof(s->pb))
233  return AVERROR_EOF;
234 
236  if (ret < 0)
237  return ret;
238 
240  if (ret < 0)
241  return ret;
242 
243  return 0;
244 
245  } else if (!ifv->is_audio_present) {
246  /*read new video index*/
247 
248  ifv->next_video_index = ifv->total_vframes;
249 
250  avio_skip(s->pb, 0x1c);
251  vframes = ifv->total_vframes + (uint64_t)avio_rl32(s->pb);
252  if (vframes > INT_MAX)
253  return AVERROR_INVALIDDATA;
254  ifv->total_vframes = vframes;
255  avio_skip(s->pb, 0x10);
256 
257  if (avio_feof(s->pb))
258  return AVERROR_EOF;
259 
261  if (ret < 0)
262  return ret;
263 
264  return 0;
265  }
266  }
267 
268  if (!e_next) return AVERROR_EOF;
269 
270  avio_seek(s->pb, e_next->pos, SEEK_SET);
271  ret = av_get_packet(s->pb, pkt, e_next->size);
272  if (ret < 0)
273  return ret;
274 
275  if (e_next == ev) {
276  ifv->next_video_index++;
278  } else {
279  ifv->next_audio_index++;
281  }
282 
283  pkt->pts = e_next->timestamp;
284  pkt->pos = e_next->pos;
285 
286  return 0;
287 }
288 
289 static int ifv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
290 {
291  IFVContext *ifv = s->priv_data;
292 
293  for (unsigned i = 0; i < s->nb_streams; i++) {
294  int index = av_index_search_timestamp(s->streams[i], ts, AVSEEK_FLAG_ANY);
295  if (index < 0) {
296  ifv->next_video_index = ifv->total_vframes - 1;
297  ifv->next_audio_index = ifv->total_aframes - 1;
298  return 0;
299  }
300 
301  if (i == ifv->video_stream_index) {
302  ifv->next_video_index = index;
303  } else {
304  ifv->next_audio_index = index;
305  }
306  }
307 
308  return 0;
309 }
310 
312  .name = "ifv",
313  .long_name = NULL_IF_CONFIG_SMALL("IFV CCTV DVR"),
314  .priv_data_size = sizeof(IFVContext),
315  .extensions = "ifv",
320 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:320
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: options.c:237
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:57
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
read_index
static int read_index(AVFormatContext *s, enum AVMediaType frame_type, uint32_t start_index)
Definition: ifv.c:53
IFVContext::video_stream_index
int video_stream_index
Definition: ifv.c:38
IFVContext::audio_stream_index
int audio_stream_index
Definition: ifv.c:39
AV_CHANNEL_LAYOUT_MONO
#define AV_CHANNEL_LAYOUT_MONO
Definition: channel_layout.h:353
IFVContext::next_audio_index
uint32_t next_audio_index
Definition: ifv.c:30
IFVContext::total_vframes
uint32_t total_vframes
Definition: ifv.c:31
AVIndexEntry
Definition: avformat.h:807
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:465
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: avformat.c:763
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:407
IFVContext::next_video_index
uint32_t next_video_index
Definition: ifv.c:29
AVSEEK_FLAG_ANY
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2291
read_seek
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:151
av_add_index_entry
int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp, int size, int distance, int flags)
Add an index entry into a sorted list.
Definition: seek.c:118
IFVContext::is_audio_present
int is_audio_present
Definition: ifv.c:35
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:743
pkt
AVPacket * pkt
Definition: movenc.c:59
AVInputFormat
Definition: avformat.h:656
s
#define s(width, name)
Definition: cbs_vp9.c:256
parse_header
static int parse_header(AVFormatContext *s)
Definition: ifv.c:90
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:661
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:455
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:127
AVIndexEntry::size
int size
Definition: avformat.h:818
AVIndexEntry::timestamp
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:809
ifv_read_seek
static int ifv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
Definition: ifv.c:289
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:77
ifv_read_packet
static int ifv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ifv.c:187
AVFormatContext
Format I/O context.
Definition: avformat.h:1213
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1108
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:532
NULL
#define NULL
Definition: coverity.c:32
read_probe
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
ifv_probe
static int ifv_probe(const AVProbeData *p)
Definition: ifv.c:42
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:254
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:453
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:212
index
int index
Definition: gxfenc.c:89
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:177
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:759
AVMediaType
AVMediaType
Definition: avutil.h:199
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
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:290
FFStream
Definition: internal.h:197
size
int size
Definition: twinvq_data.h:10344
ifv_read_header
static int ifv_read_header(AVFormatContext *s)
Definition: ifv.c:128
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:367
frame_type
frame_type
Definition: jpeg2000_parser.c:31
avio_internal.h
AVCodecParameters::height
int height
Definition: codec_par.h:128
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:102
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:948
IFVContext
Definition: ifv.c:28
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:260
pos
unsigned int pos
Definition: spdifenc.c:412
avformat.h
IFVContext::width
int width
Definition: ifv.c:34
ff_ifv_demuxer
const AVInputFormat ff_ifv_demuxer
Definition: ifv.c:311
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:956
channel_layout.h
IFVContext::total_aframes
uint32_t total_aframes
Definition: ifv.c:32
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:808
AVPacket::stream_index
int stream_index
Definition: packet.h:376
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:347
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:252
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
IFVContext::sample_rate
int sample_rate
Definition: ifv.c:36
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:61
AVPacket
This structure stores compressed data.
Definition: packet.h:351
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:394
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
MKTAG
#define MKTAG(a, b, c, d)
Definition: macros.h:55
AVStream::start_time
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base.
Definition: avformat.h:988
avpriv_dict_set_timestamp
int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp)
Set a dictionary value to an ISO-8601 compliant timestamp string.
Definition: dict.c:258
IFVContext::height
int height
Definition: ifv.c:34
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:238
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:375