FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/dhav.c
Date: 2026-09-27 22:20:00
Exec Total Coverage
Lines: 4 296 1.4%
Functions: 1 9 11.1%
Branches: 2 147 1.4%
Line Branch Exec Source
1 /*
2 * DHAV demuxer
3 *
4 * Copyright (c) 2018 Paul B Mahol
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 <time.h>
24
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/mem.h"
27 #include "libavutil/parseutils.h"
28 #include "avio_internal.h"
29 #include "avformat.h"
30 #include "demux.h"
31 #include "internal.h"
32
33 typedef struct DHAVContext {
34 unsigned type;
35 unsigned subtype;
36 unsigned channel;
37 unsigned frame_subnumber;
38 unsigned frame_number;
39 unsigned date;
40 unsigned timestamp;
41 int width, height;
42 int video_codec;
43 int frame_rate;
44 int audio_channels;
45 int audio_codec;
46 int sample_rate;
47 int64_t last_good_pos;
48 int64_t duration;
49
50 int video_stream_index;
51 int audio_stream_index;
52 } DHAVContext;
53
54 typedef struct DHAVStream {
55 int64_t last_frame_number;
56 int64_t last_timestamp;
57 int64_t last_time;
58 int64_t pts;
59 } DHAVStream;
60
61 8071 static int dhav_probe(const AVProbeData *p)
62 {
63
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 8071 if (!memcmp(p->buf, "DAHUA", 5))
64 ✗ return AVPROBE_SCORE_MAX;
65
66
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 8071 if (memcmp(p->buf, "DHAV", 4))
67 8071 return 0;
68
69 ✗ if (p->buf[4] == 0xf0 ||
70 ✗ p->buf[4] == 0xf1 ||
71 ✗ p->buf[4] == 0xfc ||
72 ✗ p->buf[4] == 0xfd)
73 ✗ return AVPROBE_SCORE_MAX;
74 ✗ return 0;
75 }
76
77 static const uint32_t sample_rates[] = {
78 8000, 4000, 8000, 11025, 16000,
79 20000, 22050, 32000, 44100, 48000,
80 96000, 192000, 64000,
81 };
82
83 ✗ static int parse_ext(AVFormatContext *s, int length)
84 {
85 ✗ DHAVContext *dhav = s->priv_data;
86 ✗ int64_t ret = 0;
87
88 ✗ while (length > 0) {
89 ✗ int type = avio_r8(s->pb);
90 int index;
91
92 ✗ switch (type) {
93 ✗ case 0x80:
94 ✗ ret = avio_skip(s->pb, 1);
95 ✗ dhav->width = 8 * avio_r8(s->pb);
96 ✗ dhav->height = 8 * avio_r8(s->pb);
97 ✗ length -= 4;
98 ✗ break;
99 ✗ case 0x81:
100 ✗ ret = avio_skip(s->pb, 1);
101 ✗ dhav->video_codec = avio_r8(s->pb);
102 ✗ dhav->frame_rate = avio_r8(s->pb);
103 ✗ length -= 4;
104 ✗ break;
105 ✗ case 0x82:
106 ✗ ret = avio_skip(s->pb, 3);
107 ✗ dhav->width = avio_rl16(s->pb);
108 ✗ dhav->height = avio_rl16(s->pb);
109 ✗ length -= 8;
110 ✗ break;
111 ✗ case 0x83:
112 ✗ dhav->audio_channels = avio_r8(s->pb);
113 ✗ dhav->audio_codec = avio_r8(s->pb);
114 ✗ index = avio_r8(s->pb);
115 ✗ if (index < FF_ARRAY_ELEMS(sample_rates)) {
116 ✗ dhav->sample_rate = sample_rates[index];
117 } else {
118 ✗ dhav->sample_rate = 8000;
119 }
120 ✗ length -= 4;
121 ✗ break;
122 ✗ case 0x88:
123 ✗ ret = avio_skip(s->pb, 7);
124 ✗ length -= 8;
125 ✗ break;
126 ✗ case 0x8c:
127 ✗ ret = avio_skip(s->pb, 1);
128 ✗ dhav->audio_channels = avio_r8(s->pb);
129 ✗ dhav->audio_codec = avio_r8(s->pb);
130 ✗ index = avio_r8(s->pb);
131 ✗ if (index < FF_ARRAY_ELEMS(sample_rates)) {
132 ✗ dhav->sample_rate = sample_rates[index];
133 } else {
134 ✗ dhav->sample_rate = 8000;
135 }
136 ✗ ret = avio_skip(s->pb, 3);
137 ✗ length -= 8;
138 ✗ break;
139 ✗ case 0x91:
140 case 0x92:
141 case 0x93:
142 case 0x95:
143 case 0x9a:
144 case 0x9b: // sample aspect ratio
145 case 0xb3:
146 ✗ ret = avio_skip(s->pb, 7);
147 ✗ length -= 8;
148 ✗ break;
149 ✗ case 0x84:
150 case 0x85:
151 case 0x8b:
152 case 0x94:
153 case 0x96:
154 case 0xa0:
155 case 0xb2:
156 case 0xb4:
157 ✗ ret = avio_skip(s->pb, 3);
158 ✗ length -= 4;
159 ✗ break;
160 ✗ default:
161 ✗ av_log(s, AV_LOG_INFO, "Unknown type: %X, skipping rest of header.\n", type);
162 ✗ ret = avio_skip(s->pb, length - 1);
163 ✗ length = 0;
164 }
165
166 ✗ if (ret < 0)
167 ✗ return ret;
168 }
169
170 ✗ return 0;
171 }
172
173 ✗ static int read_chunk(AVFormatContext *s)
174 {
175 ✗ DHAVContext *dhav = s->priv_data;
176 int frame_length, ext_length;
177 int64_t start, end, ret;
178
179 ✗ if (avio_feof(s->pb))
180 ✗ return AVERROR_EOF;
181
182 ✗ while (avio_r8(s->pb) != 'D' || avio_r8(s->pb) != 'H' || avio_r8(s->pb) != 'A' || avio_r8(s->pb) != 'V') {
183 ✗ if (avio_feof(s->pb))
184 ✗ return AVERROR_EOF;
185 }
186
187 ✗ start = avio_tell(s->pb) - 4;
188 ✗ dhav->last_good_pos = start;
189 ✗ dhav->type = avio_r8(s->pb);
190 ✗ dhav->subtype = avio_r8(s->pb);
191 ✗ dhav->channel = avio_r8(s->pb);
192 ✗ dhav->frame_subnumber = avio_r8(s->pb);
193 ✗ dhav->frame_number = avio_rl32(s->pb);
194 ✗ frame_length = avio_rl32(s->pb);
195 ✗ dhav->date = avio_rl32(s->pb);
196
197 ✗ if (frame_length < 24)
198 ✗ return AVERROR_INVALIDDATA;
199 ✗ if (dhav->type == 0xf1) {
200 ✗ ret = avio_skip(s->pb, frame_length - 20);
201 ✗ return ret < 0 ? ret : 0;
202 }
203
204 ✗ dhav->timestamp = avio_rl16(s->pb);
205 ✗ ext_length = avio_r8(s->pb);
206 ✗ avio_skip(s->pb, 1); // checksum
207
208 ✗ ret = parse_ext(s, ext_length);
209 ✗ if (ret < 0)
210 ✗ return ret;
211
212 ✗ end = avio_tell(s->pb);
213
214 ✗ return frame_length - 8 - (end - start);
215 }
216
217 ✗ static void get_timeinfo(unsigned date, struct tm *timeinfo)
218 {
219 int year, month, day, hour, min, sec;
220
221 ✗ sec = date & 0x3F;
222 ✗ min = (date >> 6) & 0x3F;
223 ✗ hour = (date >> 12) & 0x1F;
224 ✗ day = (date >> 17) & 0x1F;
225 ✗ month = (date >> 22) & 0x0F;
226 ✗ year = ((date >> 26) & 0x3F) + 2000;
227
228 ✗ timeinfo->tm_year = year - 1900;
229 ✗ timeinfo->tm_mon = month - 1;
230 ✗ timeinfo->tm_mday = day;
231 ✗ timeinfo->tm_hour = hour;
232 ✗ timeinfo->tm_min = min;
233 ✗ timeinfo->tm_sec = sec;
234 ✗ }
235
236 #define MAX_DURATION_BUFFER_SIZE (1024*1024)
237
238 ✗ static int64_t get_duration(AVFormatContext *s)
239 {
240 ✗ if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
241 ✗ return 0;
242
243 ✗ int64_t start_pos = avio_tell(s->pb);
244 ✗ int64_t pos = -1;
245 ✗ int64_t start = 0;
246 struct tm timeinfo;
247 uint8_t *buffer;
248 int64_t buffer_size;
249 int64_t buffer_pos;
250 int64_t offset;
251 unsigned date;
252 ✗ int64_t size = avio_size(s->pb);
253 ✗ int64_t ret = 0;
254
255 ✗ if (start_pos < 0 || start_pos > size - 20)
256 ✗ return 0;
257
258 ✗ avio_skip(s->pb, 16);
259 ✗ date = avio_rl32(s->pb);
260 ✗ get_timeinfo(date, &timeinfo);
261 ✗ start = av_timegm(&timeinfo) * 1000LL;
262
263 ✗ buffer_size = FFMIN(MAX_DURATION_BUFFER_SIZE, size);
264 ✗ buffer = av_malloc(buffer_size);
265 ✗ if (!buffer)
266 ✗ goto fail;
267 ✗ buffer_pos = size - buffer_size;
268 ✗ avio_seek(s->pb, buffer_pos, SEEK_SET);
269 ✗ if (ffio_read_size(s->pb, buffer, buffer_size) < 0)
270 ✗ goto fail;
271
272 ✗ offset = buffer_size - 8;
273 ✗ while (offset > 0) {
274 ✗ if (AV_RL32(buffer + offset) == MKTAG('d','h','a','v')) {
275 ✗ int64_t seek_back = AV_RL32(buffer + offset + 4);
276 ✗ pos = buffer_pos + offset - seek_back + 8;
277 ✗ break;
278 } else {
279 ✗ offset -= 9;
280 }
281 }
282
283 ✗ if (pos < buffer_pos || pos - buffer_pos > buffer_size - 20)
284 ✗ goto fail;
285
286 ✗ date = AV_RL32(buffer + (pos - buffer_pos) + 16);
287 ✗ get_timeinfo(date, &timeinfo);
288
289 ✗ ret = av_timegm(&timeinfo) * 1000LL - start;
290 ✗ fail:
291 ✗ av_freep(&buffer);
292 ✗ avio_seek(s->pb, start_pos, SEEK_SET);
293 ✗ return ret;
294 }
295
296 ✗ static int dhav_read_header(AVFormatContext *s)
297 {
298 ✗ DHAVContext *dhav = s->priv_data;
299 uint8_t signature[5];
300 ✗ int ret = ffio_ensure_seekback(s->pb, 5);
301
302 ✗ if (ret < 0)
303 ✗ return ret;
304
305 ✗ ret = ffio_read_size(s->pb, signature, sizeof(signature));
306 ✗ if (ret < 0)
307 ✗ return ret;
308 ✗ if (!memcmp(signature, "DAHUA", 5)) {
309 ✗ avio_skip(s->pb, 0x400 - 5);
310 ✗ dhav->last_good_pos = avio_tell(s->pb);
311 } else {
312 ✗ if (!memcmp(signature, "DHAV", 4)) {
313 ✗ avio_seek(s->pb, -5, SEEK_CUR);
314 ✗ dhav->last_good_pos = avio_tell(s->pb);
315 ✗ } else if (s->pb->seekable) {
316 ✗ avio_seek(s->pb, avio_size(s->pb) - 8, SEEK_SET);
317 ✗ while (avio_rl32(s->pb) == MKTAG('d','h','a','v')) {
318 int seek_back;
319
320 ✗ seek_back = avio_rl32(s->pb) + 8;
321 ✗ if (seek_back < 9)
322 ✗ break;
323 ✗ dhav->last_good_pos = avio_tell(s->pb);
324 ✗ int64_t ret64 = avio_seek(s->pb, -seek_back, SEEK_CUR);
325 ✗ if (ret64 < 0)
326 ✗ return ret64;
327 }
328 ✗ avio_seek(s->pb, dhav->last_good_pos, SEEK_SET);
329 }
330 }
331
332 ✗ dhav->duration = get_duration(s);
333 ✗ dhav->last_good_pos = avio_tell(s->pb);
334 ✗ s->ctx_flags |= AVFMTCTX_NOHEADER;
335 ✗ dhav->video_stream_index = -1;
336 ✗ dhav->audio_stream_index = -1;
337
338 ✗ return 0;
339 }
340
341 ✗ static int64_t get_pts(AVFormatContext *s, int stream_index)
342 {
343 ✗ DHAVStream *dst = s->streams[stream_index]->priv_data;
344 ✗ DHAVContext *dhav = s->priv_data;
345 struct tm timeinfo;
346 time_t t;
347
348 ✗ get_timeinfo(dhav->date, &timeinfo);
349
350 ✗ t = av_timegm(&timeinfo);
351 ✗ if (dst->last_time == t) {
352 ✗ int64_t diff = dhav->timestamp - dst->last_timestamp;
353
354 ✗ if (diff < 0)
355 ✗ diff += 65535;
356 ✗ if (diff == 0 && dhav->frame_rate)
357 ✗ diff = av_rescale(dhav->frame_number - dst->last_frame_number, 1000, dhav->frame_rate);
358 ✗ dst->pts += diff;
359 } else {
360 ✗ dst->pts = t * 1000LL;
361 }
362
363 ✗ dst->last_time = t;
364 ✗ dst->last_timestamp = dhav->timestamp;
365 ✗ dst->last_frame_number = dhav->frame_number;
366
367 ✗ return dst->pts;
368 }
369
370 ✗ static int dhav_read_packet(AVFormatContext *s, AVPacket *pkt)
371 {
372 ✗ DHAVContext *dhav = s->priv_data;
373 int size, ret, stream_index;
374
375 ✗ retry:
376 ✗ while ((ret = read_chunk(s)) == 0)
377 ;
378
379 ✗ if (ret < 0)
380 ✗ return ret;
381
382 ✗ if (dhav->type == 0xfd && dhav->video_stream_index == -1) {
383 ✗ AVStream *st = avformat_new_stream(s, NULL);
384 DHAVStream *dst;
385
386 ✗ if (!st)
387 ✗ return AVERROR(ENOMEM);
388
389 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
390 ✗ switch (dhav->video_codec) {
391 ✗ case 0x1: st->codecpar->codec_id = AV_CODEC_ID_MPEG4; break;
392 ✗ case 0x3: st->codecpar->codec_id = AV_CODEC_ID_MJPEG; break;
393 ✗ case 0x2:
394 case 0x4:
395 ✗ case 0x8: st->codecpar->codec_id = AV_CODEC_ID_H264; break;
396 ✗ case 0xc: st->codecpar->codec_id = AV_CODEC_ID_HEVC; break;
397 ✗ default: avpriv_request_sample(s, "Unknown video codec %X", dhav->video_codec);
398 }
399 ✗ st->duration = dhav->duration;
400 ✗ st->codecpar->width = dhav->width;
401 ✗ st->codecpar->height = dhav->height;
402 ✗ st->avg_frame_rate.num = dhav->frame_rate;
403 ✗ st->avg_frame_rate.den = 1;
404 ✗ st->priv_data = dst = av_mallocz(sizeof(DHAVStream));
405 ✗ if (!st->priv_data)
406 ✗ return AVERROR(ENOMEM);
407 ✗ dst->last_time = AV_NOPTS_VALUE;
408 ✗ dhav->video_stream_index = st->index;
409
410 ✗ avpriv_set_pts_info(st, 64, 1, 1000);
411 ✗ } else if (dhav->type == 0xf0 && dhav->audio_stream_index == -1) {
412 ✗ AVStream *st = avformat_new_stream(s, NULL);
413 DHAVStream *dst;
414
415 ✗ if (!st)
416 ✗ return AVERROR(ENOMEM);
417
418 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
419 ✗ switch (dhav->audio_codec) {
420 ✗ case 0x07: st->codecpar->codec_id = AV_CODEC_ID_PCM_S8; break;
421 ✗ case 0x0c: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; break;
422 ✗ case 0x10: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; break;
423 ✗ case 0x0a: st->codecpar->codec_id = AV_CODEC_ID_PCM_MULAW; break;
424 ✗ case 0x16: st->codecpar->codec_id = AV_CODEC_ID_PCM_MULAW; break;
425 ✗ case 0x0e: st->codecpar->codec_id = AV_CODEC_ID_PCM_ALAW; break;
426 ✗ case 0x1a: st->codecpar->codec_id = AV_CODEC_ID_AAC; break;
427 ✗ case 0x1f: st->codecpar->codec_id = AV_CODEC_ID_MP2; break;
428 ✗ case 0x21: st->codecpar->codec_id = AV_CODEC_ID_MP3; break;
429 ✗ case 0x0d: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_MS; break;
430 ✗ default: avpriv_request_sample(s, "Unknown audio codec %X", dhav->audio_codec);
431 }
432 ✗ st->duration = dhav->duration;
433 ✗ st->codecpar->ch_layout.nb_channels = dhav->audio_channels;
434 ✗ st->codecpar->sample_rate = dhav->sample_rate;
435 ✗ st->priv_data = dst = av_mallocz(sizeof(DHAVStream));
436 ✗ if (!st->priv_data)
437 ✗ return AVERROR(ENOMEM);
438 ✗ dst->last_time = AV_NOPTS_VALUE;
439 ✗ dhav->audio_stream_index = st->index;
440
441 ✗ avpriv_set_pts_info(st, 64, 1, 1000);
442 }
443
444 ✗ stream_index = dhav->type == 0xf0 ? dhav->audio_stream_index : dhav->video_stream_index;
445 ✗ if (stream_index < 0) {
446 ✗ avio_skip(s->pb, ret);
447 ✗ if (avio_rl32(s->pb) == MKTAG('d','h','a','v'))
448 ✗ avio_skip(s->pb, 4);
449 ✗ goto retry;
450 }
451
452 ✗ size = ret;
453 ✗ ret = av_get_packet(s->pb, pkt, size);
454 ✗ if (ret < 0)
455 ✗ return ret;
456 ✗ pkt->stream_index = stream_index;
457 ✗ if (dhav->type != 0xfc)
458 ✗ pkt->flags |= AV_PKT_FLAG_KEY;
459 ✗ pkt->duration = 1;
460 ✗ if (pkt->stream_index >= 0)
461 ✗ pkt->pts = get_pts(s, pkt->stream_index);
462 ✗ pkt->pos = dhav->last_good_pos;
463 ✗ if (avio_rl32(s->pb) == MKTAG('d','h','a','v'))
464 ✗ avio_skip(s->pb, 4);
465
466 ✗ return ret;
467 }
468
469 ✗ static int dhav_read_seek(AVFormatContext *s, int stream_index,
470 int64_t timestamp, int flags)
471 {
472 ✗ DHAVContext *dhav = s->priv_data;
473 ✗ AVStream *st = s->streams[stream_index];
474 ✗ FFStream *const sti = ffstream(st);
475 ✗ int index = av_index_search_timestamp(st, timestamp, flags);
476 int64_t pts;
477
478 ✗ if (index < 0)
479 ✗ return -1;
480 ✗ pts = sti->index_entries[index].timestamp;
481 ✗ if (pts < timestamp)
482 ✗ return AVERROR(EAGAIN);
483 ✗ if (avio_seek(s->pb, sti->index_entries[index].pos, SEEK_SET) < 0)
484 ✗ return -1;
485
486 ✗ for (int n = 0; n < s->nb_streams; n++) {
487 ✗ DHAVStream *const dst = s->streams[n]->priv_data;
488
489 ✗ dst->pts = pts;
490 ✗ dst->last_time = AV_NOPTS_VALUE;
491 }
492 ✗ dhav->last_good_pos = avio_tell(s->pb);
493
494 ✗ return 0;
495 }
496
497 const FFInputFormat ff_dhav_demuxer = {
498 .p.name = "dhav",
499 .p.long_name = NULL_IF_CONFIG_SMALL("Video DAV"),
500 .p.extensions = "dav",
501 .p.flags = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK | AVFMT_TS_DISCONT | AVFMT_TS_NONSTRICT | AVFMT_SEEK_TO_PTS,
502 .priv_data_size = sizeof(DHAVContext),
503 .read_probe = dhav_probe,
504 .read_header = dhav_read_header,
505 .read_packet = dhav_read_packet,
506 .read_seek = dhav_read_seek,
507 };
508