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 
25 #include "avformat.h"
26 #include "demux.h"
27 #include "internal.h"
28 #include "avio_internal.h"
29 
30 typedef struct IFVContext {
31  uint32_t next_video_index;
32  uint32_t next_audio_index;
33  uint32_t total_vframes;
34  uint32_t total_aframes;
35 
36  int width, height;
39 
42 } IFVContext;
43 
44 static int ifv_probe(const AVProbeData *p)
45 {
46  static const uint8_t ifv_magic[] = {0x11, 0xd2, 0xd3, 0xab, 0xba, 0xa9,
47  0xcf, 0x11, 0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65, 0x44};
48 
49  if (!memcmp(p->buf, ifv_magic, sizeof(ifv_magic)))
50  return AVPROBE_SCORE_MAX;
51 
52  return 0;
53 }
54 
57  uint32_t start_index)
58 {
59  IFVContext *ifv = s->priv_data;
60  AVStream *st;
61  int64_t pos, size, timestamp;
62  uint32_t end_index, i;
63  int ret;
64 
66  end_index = ifv->total_vframes;
67  st = s->streams[ifv->video_stream_index];
68  } else {
69  end_index = ifv->total_aframes;
70  st = s->streams[ifv->audio_stream_index];
71  }
72 
73  for (i = start_index; i < end_index; i++) {
74  if (avio_feof(s->pb))
75  return AVERROR_EOF;
76  pos = avio_rl32(s->pb);
77  size = avio_rl32(s->pb);
78 
79  avio_skip(s->pb, 8);
80  timestamp = avio_rl32(s->pb);
81 
82  ret = av_add_index_entry(st, pos, timestamp, size, 0, 0);
83  if (ret < 0)
84  return ret;
85 
86  avio_skip(s->pb, frame_type == AVMEDIA_TYPE_VIDEO ? 8: 4);
87  }
88 
89  return 0;
90 }
91 
93 {
94  IFVContext *ifv = s->priv_data;
95  uint32_t aud_magic;
96  uint32_t vid_magic;
97 
98  avio_skip(s->pb, 0x34);
99  avpriv_dict_set_timestamp(&s->metadata, "creation_time", avio_rl32(s->pb) * 1000000LL);
100  avio_skip(s->pb, 0x24);
101 
102  ifv->width = avio_rl16(s->pb);
103  ifv->height = avio_rl16(s->pb);
104 
105  avio_skip(s->pb, 0x8);
106  vid_magic = avio_rl32(s->pb);
107 
108  if (vid_magic != MKTAG('H','2','6','4'))
109  avpriv_request_sample(s, "Unknown video codec %x", vid_magic);
110 
111  avio_skip(s->pb, 0x2c);
112  ifv->sample_rate = avio_rl32(s->pb);
113  aud_magic = avio_rl32(s->pb);
114 
115  if (aud_magic == MKTAG('G','R','A','W')) {
116  ifv->is_audio_present = 1;
117  } else if (aud_magic == MKTAG('P','C','M','U')) {
118  ifv->is_audio_present = 0;
119  } else {
120  avpriv_request_sample(s, "Unknown audio codec %x", aud_magic);
121  }
122 
123  avio_skip(s->pb, 0x44);
124  ifv->total_vframes = avio_rl32(s->pb);
125  ifv->total_aframes = avio_rl32(s->pb);
126 
127  return 0;
128 }
129 
131 {
132  IFVContext *ifv = s->priv_data;
133  AVStream *st;
134  int ret;
135 
136  ret = parse_header(s);
137  if (ret < 0)
138  return ret;
139 
140  st = avformat_new_stream(s, NULL);
141  if (!st)
142  return AVERROR(ENOMEM);
143 
146  st->codecpar->width = ifv->width;
147  st->codecpar->height = ifv->height;
148  st->start_time = 0;
149  ifv->video_stream_index = st->index;
150 
151  avpriv_set_pts_info(st, 32, 1, 1000);
152 
153  if (ifv->is_audio_present) {
154  st = avformat_new_stream(s, NULL);
155  if (!st)
156  return AVERROR(ENOMEM);
157 
161  st->codecpar->sample_rate = ifv->sample_rate;
162  ifv->audio_stream_index = st->index;
163 
164  avpriv_set_pts_info(st, 32, 1, 1000);
165  }
166 
167  /*read video index*/
168  avio_seek(s->pb, 0xf8, SEEK_SET);
169 
171  if (ret < 0)
172  return ret;
173 
174  if (ifv->is_audio_present) {
175  /*read audio index*/
176  avio_seek(s->pb, 0x14918, SEEK_SET);
177 
179  if (ret < 0)
180  return ret;
181  }
182 
183  ifv->next_video_index = 0;
184  ifv->next_audio_index = 0;
185 
186  return 0;
187 }
188 
190 {
191  IFVContext *ifv = s->priv_data;
192  AVIndexEntry *ev, *ea, *e_next;
193  int ret;
194 
195  ev = ea = e_next = NULL;
196 
197  if (ifv->next_video_index < ifv->total_vframes) {
198  AVStream *const st = s->streams[ifv->video_stream_index];
199  FFStream *const sti = ffstream(st);
200 
201  if (ifv->next_video_index < sti->nb_index_entries)
202  e_next = ev = &sti->index_entries[ifv->next_video_index];
203  }
204 
205  if (ifv->is_audio_present &&
206  ifv->next_audio_index < ifv->total_aframes) {
207  AVStream *const st = s->streams[ifv->audio_stream_index];
208  FFStream *const sti = ffstream(st);
209 
210  if (ifv->next_audio_index < sti->nb_index_entries) {
211  ea = &sti->index_entries[ifv->next_audio_index];
212  if (!ev || ea->timestamp < ev->timestamp)
213  e_next = ea;
214  }
215  }
216 
217  if (!ev) {
218  uint64_t vframes, aframes;
219  if (ifv->is_audio_present && !ea) {
220  /*read new video and audio indexes*/
221 
222  ifv->next_video_index = ifv->total_vframes;
223  ifv->next_audio_index = ifv->total_aframes;
224 
225  avio_skip(s->pb, 0x1c);
226  vframes = ifv->total_vframes + (uint64_t)avio_rl32(s->pb);
227  aframes = ifv->total_aframes + (uint64_t)avio_rl32(s->pb);
228  if (vframes > INT_MAX || aframes > INT_MAX)
229  return AVERROR_INVALIDDATA;
230  ifv->total_vframes = vframes;
231  ifv->total_aframes = aframes;
232  avio_skip(s->pb, 0xc);
233 
234  if (avio_feof(s->pb))
235  return AVERROR_EOF;
236 
238  if (ret < 0)
239  return ret;
240 
242  if (ret < 0)
243  return ret;
244 
245  return 0;
246 
247  } else if (!ifv->is_audio_present) {
248  /*read new video index*/
249 
250  ifv->next_video_index = ifv->total_vframes;
251 
252  avio_skip(s->pb, 0x1c);
253  vframes = ifv->total_vframes + (uint64_t)avio_rl32(s->pb);
254  if (vframes > INT_MAX)
255  return AVERROR_INVALIDDATA;
256  ifv->total_vframes = vframes;
257  avio_skip(s->pb, 0x10);
258 
259  if (avio_feof(s->pb))
260  return AVERROR_EOF;
261 
263  if (ret < 0)
264  return ret;
265 
266  return 0;
267  }
268  }
269 
270  if (!e_next) return AVERROR_EOF;
271 
272  avio_seek(s->pb, e_next->pos, SEEK_SET);
273  ret = av_get_packet(s->pb, pkt, e_next->size);
274  if (ret < 0)
275  return ret;
276 
277  if (e_next == ev) {
278  ifv->next_video_index++;
280  } else {
281  ifv->next_audio_index++;
283  }
284 
285  pkt->pts = e_next->timestamp;
286  pkt->pos = e_next->pos;
287 
288  return 0;
289 }
290 
291 static int ifv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
292 {
293  IFVContext *ifv = s->priv_data;
294 
295  for (unsigned i = 0; i < s->nb_streams; i++) {
296  int index = av_index_search_timestamp(s->streams[i], ts, AVSEEK_FLAG_ANY);
297  if (index < 0) {
298  ifv->next_video_index = ifv->total_vframes - 1;
299  ifv->next_audio_index = ifv->total_aframes - 1;
300  return 0;
301  }
302 
303  if (i == ifv->video_stream_index) {
304  ifv->next_video_index = index;
305  } else {
306  ifv->next_audio_index = index;
307  }
308  }
309 
310  return 0;
311 }
312 
314  .p.name = "ifv",
315  .p.long_name = NULL_IF_CONFIG_SMALL("IFV CCTV DVR"),
316  .p.extensions = "ifv",
317  .priv_data_size = sizeof(IFVContext),
322 };
AV_CODEC_ID_PCM_S16LE
@ AV_CODEC_ID_PCM_S16LE
Definition: codec_id.h:328
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
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
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:55
IFVContext::video_stream_index
int video_stream_index
Definition: ifv.c:40
dict_internal.h
IFVContext::audio_stream_index
int audio_stream_index
Definition: ifv.c:41
IFVContext::next_audio_index
uint32_t next_audio_index
Definition: ifv.c:32
IFVContext::total_vframes
uint32_t total_vframes
Definition: ifv.c:33
AVIndexEntry
Definition: avformat.h:602
AVPROBE_SCORE_MAX
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:463
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:853
ffstream
static av_always_inline FFStream * ffstream(AVStream *st)
Definition: internal.h:417
IFVContext::next_video_index
uint32_t next_video_index
Definition: ifv.c:31
AVSEEK_FLAG_ANY
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2447
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:121
IFVContext::is_audio_present
int is_audio_present
Definition: ifv.c:37
avio_rl16
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:714
pkt
AVPacket * pkt
Definition: movenc.c:60
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:42
s
#define s(width, name)
Definition: cbs_vp9.c:198
parse_header
static int parse_header(AVFormatContext *s)
Definition: ifv.c:92
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:553
AVProbeData::buf
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:453
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:134
AVIndexEntry::size
int size
Definition: avformat.h:613
AVIndexEntry::timestamp
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:604
ifv_read_seek
static int ifv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
Definition: ifv.c:291
AV_CODEC_ID_H264
@ AV_CODEC_ID_H264
Definition: codec_id.h:79
ifv_read_packet
static int ifv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ifv.c:189
AVFormatContext
Format I/O context.
Definition: avformat.h:1255
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:766
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:550
NULL
#define NULL
Definition: coverity.c:32
ifv_probe
static int ifv_probe(const AVProbeData *p)
Definition: ifv.c:44
FFStream::nb_index_entries
int nb_index_entries
Definition: internal.h:251
AVProbeData
This structure contains the data a format has to probe a file.
Definition: avformat.h:451
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:180
index
int index
Definition: gxfenc.c:90
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:184
avio_rl32
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:730
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:94
AVChannelLayout
An AVChannelLayout holds information about the channel layout of audio data.
Definition: channel_layout.h:303
FFStream
Definition: internal.h:193
size
int size
Definition: twinvq_data.h:10344
FFInputFormat::p
AVInputFormat p
The public AVInputFormat.
Definition: demux.h:41
ifv_read_header
static int ifv_read_header(AVFormatContext *s)
Definition: ifv.c:130
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:517
frame_type
frame_type
Definition: jpeg2000_parser.c:31
avio_internal.h
AVCodecParameters::height
int height
Definition: codec_par.h:135
demux.h
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:91
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:743
IFVContext
Definition: ifv.c:30
avio_seek
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:231
pos
unsigned int pos
Definition: spdifenc.c:414
avformat.h
ff_ifv_demuxer
const FFInputFormat ff_ifv_demuxer
Definition: ifv.c:313
IFVContext::width
int width
Definition: ifv.c:36
AVStream::index
int index
stream index in AVFormatContext
Definition: avformat.h:749
channel_layout.h
IFVContext::total_aframes
uint32_t total_aframes
Definition: ifv.c:34
AVIndexEntry::pos
int64_t pos
Definition: avformat.h:603
AVPacket::stream_index
int stream_index
Definition: packet.h:526
avio_skip
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:318
FFStream::index_entries
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: internal.h:249
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
read_probe
static int read_probe(const AVProbeData *p)
Definition: cdg.c:30
IFVContext::sample_rate
int sample_rate
Definition: ifv.c:38
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
AV_CHANNEL_LAYOUT_MONO
#define AV_CHANNEL_LAYOUT_MONO
Definition: channel_layout.h:378
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:544
FFInputFormat
Definition: demux.h:37
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
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:792
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:278
IFVContext::height
int height
Definition: ifv.c:36
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:244
avio_feof
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:346