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 
23 #include "avformat.h"
24 #include "internal.h"
25 #include "avio_internal.h"
26 
27 typedef struct IFVContext {
28  uint32_t next_video_index;
29  uint32_t next_audio_index;
30  uint32_t total_vframes;
31  uint32_t total_aframes;
32 
33  int width, height;
36 
39 } IFVContext;
40 
41 static int ifv_probe(const AVProbeData *p)
42 {
43  static const uint8_t ifv_magic[] = {0x11, 0xd2, 0xd3, 0xab, 0xba, 0xa9,
44  0xcf, 0x11, 0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65, 0x44};
45 
46  if (!memcmp(p->buf, ifv_magic, sizeof(ifv_magic)))
47  return AVPROBE_SCORE_MAX;
48 
49  return 0;
50 }
51 
53  enum AVMediaType frame_type,
54  uint32_t start_index)
55 {
56  IFVContext *ifv = s->priv_data;
57  AVStream *st;
58  int64_t pos, size, timestamp;
59  uint32_t end_index, i;
60  int ret;
61 
62  if (frame_type == AVMEDIA_TYPE_VIDEO) {
63  end_index = ifv->total_vframes;
64  st = s->streams[ifv->video_stream_index];
65  } else {
66  end_index = ifv->total_aframes;
67  st = s->streams[ifv->audio_stream_index];
68  }
69 
70  for (i = start_index; i < end_index; i++) {
71  if (avio_feof(s->pb))
72  return AVERROR_EOF;
73  pos = avio_rl32(s->pb);
74  size = avio_rl32(s->pb);
75 
76  avio_skip(s->pb, 8);
77  timestamp = avio_rl32(s->pb);
78 
79  ret = av_add_index_entry(st, pos, timestamp, size, 0, 0);
80  if (ret < 0)
81  return ret;
82 
83  avio_skip(s->pb, frame_type == AVMEDIA_TYPE_VIDEO ? 8: 4);
84  }
85 
86  return 0;
87 }
88 
90 {
91  IFVContext *ifv = s->priv_data;
92  uint32_t aud_magic;
93  uint32_t vid_magic;
94 
95  avio_skip(s->pb, 0x34);
96  avpriv_dict_set_timestamp(&s->metadata, "creation_time", avio_rl32(s->pb) * 1000000LL);
97  avio_skip(s->pb, 0x24);
98 
99  ifv->width = avio_rl16(s->pb);
100  ifv->height = avio_rl16(s->pb);
101 
102  avio_skip(s->pb, 0x8);
103  vid_magic = avio_rl32(s->pb);
104 
105  if (vid_magic != MKTAG('H','2','6','4'))
106  avpriv_request_sample(s, "Unknown video codec %x", vid_magic);
107 
108  avio_skip(s->pb, 0x2c);
109  ifv->sample_rate = avio_rl32(s->pb);
110  aud_magic = avio_rl32(s->pb);
111 
112  if (aud_magic == MKTAG('G','R','A','W')) {
113  ifv->is_audio_present = 1;
114  } else if (aud_magic == MKTAG('P','C','M','U')) {
115  ifv->is_audio_present = 0;
116  } else {
117  avpriv_request_sample(s, "Unknown audio codec %x", aud_magic);
118  }
119 
120  avio_skip(s->pb, 0x44);
121  ifv->total_vframes = avio_rl32(s->pb);
122  ifv->total_aframes = avio_rl32(s->pb);
123 
124  return 0;
125 }
126 
128 {
129  IFVContext *ifv = s->priv_data;
130  AVStream *st;
131  int ret;
132 
133  ret = parse_header(s);
134  if (ret < 0)
135  return ret;
136 
137  st = avformat_new_stream(s, NULL);
138  if (!st)
139  return AVERROR(ENOMEM);
140 
143  st->codecpar->width = ifv->width;
144  st->codecpar->height = ifv->height;
145  st->start_time = 0;
146  ifv->video_stream_index = st->index;
147 
148  avpriv_set_pts_info(st, 32, 1, 1000);
149 
150  if (ifv->is_audio_present) {
151  st = avformat_new_stream(s, NULL);
152  if (!st)
153  return AVERROR(ENOMEM);
154 
157  st->codecpar->channels = 1;
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 
168  ret = read_index(s, AVMEDIA_TYPE_VIDEO, 0);
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 
176  ret = read_index(s, AVMEDIA_TYPE_AUDIO, 0);
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  AVStream *st;
191  AVIndexEntry *ev, *ea, *e_next;
192  int ret;
193 
194  ev = ea = e_next = NULL;
195 
196  if (ifv->next_video_index < ifv->total_vframes) {
197  st = s->streams[ifv->video_stream_index];
198  if (ifv->next_video_index < st->nb_index_entries)
199  e_next = ev = &st->index_entries[ifv->next_video_index];
200  }
201 
202  if (ifv->is_audio_present &&
203  ifv->next_audio_index < ifv->total_aframes) {
204  st = s->streams[ifv->audio_stream_index];
205  if (ifv->next_audio_index < st->nb_index_entries) {
206  ea = &st->index_entries[ifv->next_audio_index];
207  if (!ev || ea->timestamp < ev->timestamp)
208  e_next = ea;
209  }
210  }
211 
212  if (!ev) {
213  if (ifv->is_audio_present && !ea) {
214  /*read new video and audio indexes*/
215 
216  ifv->next_video_index = ifv->total_vframes;
217  ifv->next_audio_index = ifv->total_aframes;
218 
219  avio_skip(s->pb, 0x1c);
220  ifv->total_vframes += avio_rl32(s->pb);
221  ifv->total_aframes += avio_rl32(s->pb);
222  avio_skip(s->pb, 0xc);
223 
224  if (avio_feof(s->pb))
225  return AVERROR_EOF;
226 
228  if (ret < 0)
229  return ret;
230 
232  if (ret < 0)
233  return ret;
234 
235  return 0;
236 
237  } else if (!ifv->is_audio_present) {
238  /*read new video index*/
239 
240  ifv->next_video_index = ifv->total_vframes;
241 
242  avio_skip(s->pb, 0x1c);
243  ifv->total_vframes += avio_rl32(s->pb);
244  avio_skip(s->pb, 0x10);
245 
246  if (avio_feof(s->pb))
247  return AVERROR_EOF;
248 
250  if (ret < 0)
251  return ret;
252 
253  return 0;
254  }
255  }
256 
257  if (!e_next) return AVERROR_EOF;
258 
259  avio_seek(s->pb, e_next->pos, SEEK_SET);
260  ret = av_get_packet(s->pb, pkt, e_next->size);
261  if (ret < 0)
262  return ret;
263 
264  if (e_next == ev) {
265  ifv->next_video_index++;
266  pkt->stream_index = ifv->video_stream_index;
267  } else {
268  ifv->next_audio_index++;
269  pkt->stream_index = ifv->audio_stream_index;
270  }
271 
272  pkt->pts = e_next->timestamp;
273  pkt->pos = e_next->pos;
274 
275  return 0;
276 }
277 
278 static int ifv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
279 {
280  IFVContext *ifv = s->priv_data;
281 
282  for (unsigned i = 0; i < s->nb_streams; i++) {
284  if (index < 0) {
285  ifv->next_video_index = ifv->total_vframes - 1;
286  ifv->next_audio_index = ifv->total_aframes - 1;
287  return 0;
288  }
289 
290  if (i == ifv->video_stream_index) {
291  ifv->next_video_index = index;
292  } else {
293  ifv->next_audio_index = index;
294  }
295  }
296 
297  return 0;
298 }
299 
301  .name = "ifv",
302  .long_name = NULL_IF_CONFIG_SMALL("IFV CCTV DVR"),
303  .priv_data_size = sizeof(IFVContext),
304  .extensions = "ifv",
309 };
#define NULL
Definition: coverity.c:32
static int ifv_read_header(AVFormatContext *s)
Definition: ifv.c:127
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: utils.c:2049
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1500
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:4926
int64_t pos
Definition: avformat.h:810
#define AVSEEK_FLAG_ANY
seek to any frame, even non-keyframes
Definition: avformat.h:2513
#define avpriv_request_sample(...)
static int read_seek(AVFormatContext *ctx, int stream_index, int64_t timestamp, int flags)
Definition: libcdio.c:153
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
int index
stream index in AVFormatContext
Definition: avformat.h:882
uint32_t total_vframes
Definition: ifv.c:30
int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
fseek() equivalent for AVIOContext.
Definition: aviobuf.c:246
AVIndexEntry * index_entries
Only used if the format does not support seeking natively.
Definition: avformat.h:1110
uint32_t next_audio_index
Definition: ifv.c:29
int64_t avio_skip(AVIOContext *s, int64_t offset)
Skip given number of bytes forward.
Definition: aviobuf.c:334
int audio_stream_index
Definition: ifv.c:38
AVInputFormat ff_ifv_demuxer
Definition: ifv.c:300
static AVPacket pkt
static int ifv_read_packet(AVFormatContext *s, AVPacket *pkt)
Definition: ifv.c:187
int is_audio_present
Definition: ifv.c:34
int height
Definition: ifv.c:33
Format I/O context.
Definition: avformat.h:1358
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
uint8_t
int width
Video only.
Definition: avcodec.h:4034
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4499
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
#define AVERROR_EOF
End of file.
Definition: error.h:55
int video_stream_index
Definition: ifv.c:37
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
ptrdiff_t size
Definition: opengl_enc.c:100
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4070
uint32_t total_aframes
Definition: ifv.c:31
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
AVDictionary * metadata
Metadata that applies to the whole file.
Definition: avformat.h:1598
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags)
Get the index for a specific timestamp.
Definition: utils.c:2164
static int ifv_probe(const AVProbeData *p)
Definition: ifv.c:41
unsigned int avio_rl32(AVIOContext *s)
Definition: aviobuf.c:772
int64_t timestamp
Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are...
Definition: avformat.h:811
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
unsigned char * buf
Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero.
Definition: avformat.h:448
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1414
uint32_t next_video_index
Definition: ifv.c:28
#define s(width, name)
Definition: cbs_vp9.c:257
static int parse_header(AVFormatContext *s)
Definition: ifv.c:89
Definition: ifv.c:27
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:881
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
static int ifv_read_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)
Definition: ifv.c:278
AVIOContext * pb
I/O context.
Definition: avformat.h:1400
int sample_rate
Definition: ifv.c:35
static int read_index(AVFormatContext *s, enum AVMediaType frame_type, uint32_t start_index)
Definition: ifv.c:52
int nb_index_entries
Definition: avformat.h:1112
int index
Definition: gxfenc.c:89
AVMediaType
Definition: avutil.h:199
This structure contains the data a format has to probe a file.
Definition: avformat.h:446
#define flags(name, subs,...)
Definition: cbs_av1.c:561
static int read_probe(const AVProbeData *pd)
Definition: jvdec.c:55
int sample_rate
Audio only.
Definition: avcodec.h:4078
#define AVPROBE_SCORE_MAX
maximum score
Definition: avformat.h:458
unsigned int avio_rl16(AVIOContext *s)
Definition: aviobuf.c:756
Main libavformat public API header.
int width
Definition: ifv.c:33
int64_t start_time
Decoding: pts of the first frame of the stream in presentation order, in stream time base...
Definition: avformat.h:920
void * priv_data
Format private data.
Definition: avformat.h:1386
int channels
Audio only.
Definition: avcodec.h:4074
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1028
int avio_feof(AVIOContext *s)
Similar to feof() but also returns nonzero on read errors.
Definition: aviobuf.c:361
int stream_index
Definition: avcodec.h:1482
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
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:366
This structure stores compressed data.
Definition: avcodec.h:1457
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473