FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/dv.c
Date: 2026-05-02 03:33:10
Exec Total Coverage
Lines: 270 363 74.4%
Functions: 15 17 88.2%
Branches: 131 229 57.2%
Line Branch Exec Source
1 /*
2 * General DV demuxer
3 * Copyright (c) 2003 Roman Shaposhnik
4 *
5 * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
6 * of DV technical info.
7 *
8 * Raw DV format
9 * Copyright (c) 2002 Fabrice Bellard
10 *
11 * 50 Mbps (DVCPRO50) and 100 Mbps (DVCPRO HD) support
12 * Copyright (c) 2006 Daniel Maas <dmaas@maasdigital.com>
13 * Funded by BBC Research & Development
14 *
15 * This file is part of FFmpeg.
16 *
17 * FFmpeg is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU Lesser General Public
19 * License as published by the Free Software Foundation; either
20 * version 2.1 of the License, or (at your option) any later version.
21 *
22 * FFmpeg is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * Lesser General Public License for more details.
26 *
27 * You should have received a copy of the GNU Lesser General Public
28 * License along with FFmpeg; if not, write to the Free Software
29 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 */
31
32 #include "config_components.h"
33
34 #include <time.h>
35 #include "avformat.h"
36 #include "avio_internal.h"
37 #include "demux.h"
38 #include "internal.h"
39 #include "libavcodec/dv_profile.h"
40 #include "libavcodec/dv.h"
41 #include "libavutil/channel_layout.h"
42 #include "libavutil/intreadwrite.h"
43 #include "libavutil/mathematics.h"
44 #include "libavutil/mem.h"
45 #include "libavutil/timecode.h"
46 #include "dv.h"
47 #include "libavutil/avassert.h"
48
49 #if CONFIG_DV_DEMUXER
50
51 // Must be kept in sync with AVPacket
52 typedef struct DVPacket {
53 int64_t pts;
54 uint8_t *data;
55 int size;
56 int stream_index;
57 int flags;
58 int64_t pos;
59 int64_t duration;
60
61 int sample_rate;
62 int last_sample_rate;
63 } DVPacket;
64
65 struct DVDemuxContext {
66 const AVDVProfile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
67 AVFormatContext* fctx;
68 AVStream* vst;
69 AVStream* ast[4];
70 struct DVPacket audio_pkt[4];
71 uint8_t audio_buf[4][8192];
72 int ach;
73 int frames;
74
75 int64_t next_pts_video;
76 int64_t next_pts_audio;
77 };
78
79 ✗ static inline uint16_t dv_audio_12to16(uint16_t sample)
80 {
81 uint16_t shift, result;
82
83 ✗ sample = (sample < 0x800) ? sample : sample | 0xf000;
84 ✗ shift = (sample & 0xf00) >> 8;
85
86 ✗ if (shift < 0x2 || shift > 0xd) {
87 ✗ result = sample;
88 ✗ } else if (shift < 0x8) {
89 ✗ shift--;
90 ✗ result = (sample - (256 * shift)) << shift;
91 } else {
92 ✗ shift = 0xe - shift;
93 ✗ result = ((sample + ((256 * shift) + 1)) << shift) - 1;
94 }
95
96 ✗ return result;
97 }
98
99 2450 static const uint8_t *dv_extract_pack(const uint8_t *frame, enum DVPackType t)
100 {
101 int offs;
102 int c;
103
104
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 12610 for (c = 0; c < 10; c++) {
105
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 11594 switch (t) {
106 10422 case DV_AUDIO_SOURCE:
107
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 10422 if (c&1) offs = (80 * 6 + 80 * 16 * 0 + 3 + c*12000);
108 5342 else offs = (80 * 6 + 80 * 16 * 3 + 3 + c*12000);
109 10422 break;
110 ✗ case DV_AUDIO_CONTROL:
111 ✗ if (c&1) offs = (80 * 6 + 80 * 16 * 1 + 3 + c*12000);
112 ✗ else offs = (80 * 6 + 80 * 16 * 4 + 3 + c*12000);
113 ✗ break;
114 1147 case DV_VIDEO_CONTROL:
115
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 1147 if (c&1) offs = (80 * 3 + 8 + c*12000);
116 1147 else offs = (80 * 5 + 48 + 5 + c*12000);
117 1147 break;
118 25 case DV_TIMECODE:
119 25 offs = (80*1 + 3 + 3);
120 25 break;
121 ✗ default:
122 ✗ return NULL;
123 }
124
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 11594 if (frame[offs] == t)
125 1434 break;
126 }
127
128
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 2450 return frame[offs] == t ? &frame[offs] : NULL;
129 }
130
131 static const int dv_audio_frequency[3] = {
132 48000, 44100, 32000,
133 };
134
135 /*
136 * There's a couple of assumptions being made here:
137 * 1. By default we silence erroneous (0x8000/16-bit 0x800/12-bit) audio samples.
138 * We can pass them upwards when libavcodec will be ready to deal with them.
139 * 2. We don't do software emphasis.
140 * 3. Audio is always returned as 16-bit linear samples: 12-bit nonlinear samples
141 * are converted into 16-bit linear ones.
142 */
143 131 static int dv_extract_audio(const uint8_t *frame, uint8_t **ppcm,
144 const AVDVProfile *sys)
145 {
146 int size, chan, i, j, d, of, smpls, freq, quant, half_ch;
147 uint16_t lc, rc;
148 const uint8_t *as_pack;
149 uint8_t *pcm, ipcm;
150
151 131 as_pack = dv_extract_pack(frame, DV_AUDIO_SOURCE);
152
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 131 if (!as_pack) /* No audio ? */
153 ✗ return 0;
154
155 131 smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
156 131 freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */
157 131 quant = as_pack[4] & 0x07; /* 0 - 16-bit linear, 1 - 12-bit nonlinear */
158
159
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 131 if (quant > 1)
160 ✗ return -1; /* unsupported quantization */
161
162
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 131 if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency))
163 ✗ return AVERROR_INVALIDDATA;
164
165 131 size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
166 131 half_ch = sys->difseg_size / 2;
167
168 /* We work with 720p frames split in half, thus even frames have
169 * channels 0,1 and odd 2,3. */
170
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 131 ipcm = (sys->height == 720 && !(frame[1] & 0x0C)) ? 2 : 0;
171
172
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 131 if (ipcm + sys->n_difchan > (quant == 1 ? 2 : 4)) {
173 ✗ av_log(NULL, AV_LOG_ERROR, "too many dv pcm frames\n");
174 ✗ return AVERROR_INVALIDDATA;
175 }
176
177 /* for each DIF channel */
178
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 262 for (chan = 0; chan < sys->n_difchan; chan++) {
179
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 131 av_assert0(ipcm<4);
180 131 pcm = ppcm[ipcm++];
181
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 131 if (!pcm)
182 ✗ break;
183
184 /* for each DIF segment */
185
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 1643 for (i = 0; i < sys->difseg_size; i++) {
186 1512 frame += 6 * 80; /* skip DIF segment header */
187
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 1512 if (quant == 1 && i == half_ch) {
188 /* next stereo channel (12-bit mode only) */
189 ✗ av_assert0(ipcm<4);
190 ✗ pcm = ppcm[ipcm++];
191 ✗ if (!pcm)
192 ✗ break;
193 }
194
195 /* for each AV sequence */
196
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 15120 for (j = 0; j < 9; j++) {
197
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 503496 for (d = 8; d < 80; d += 2) {
198
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 489888 if (quant == 0) { /* 16-bit quantization */
199 489888 of = sys->audio_shuffle[i][j] +
200 489888 (d - 8) / 2 * sys->audio_stride;
201
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 489888 if (of * 2 >= size)
202 5956 continue;
203
204 /* FIXME: maybe we have to admit that DV is a
205 * big-endian PCM */
206 483932 pcm[of * 2] = frame[d + 1];
207 483932 pcm[of * 2 + 1] = frame[d];
208
209
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 483932 if (pcm[of * 2 + 1] == 0x80 && pcm[of * 2] == 0x00)
210 ✗ pcm[of * 2 + 1] = 0;
211 } else { /* 12-bit quantization */
212 ✗ lc = ((uint16_t)frame[d] << 4) |
213 ✗ ((uint16_t)frame[d + 2] >> 4);
214 ✗ rc = ((uint16_t)frame[d + 1] << 4) |
215 ✗ ((uint16_t)frame[d + 2] & 0x0f);
216 ✗ lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
217 ✗ rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
218
219 ✗ of = sys->audio_shuffle[i % half_ch][j] +
220 ✗ (d - 8) / 3 * sys->audio_stride;
221 ✗ if (of * 2 >= size)
222 ✗ continue;
223
224 /* FIXME: maybe we have to admit that DV is a
225 * big-endian PCM */
226 ✗ pcm[of * 2] = lc & 0xff;
227 ✗ pcm[of * 2 + 1] = lc >> 8;
228 ✗ of = sys->audio_shuffle[i % half_ch + half_ch][j] +
229 ✗ (d - 8) / 3 * sys->audio_stride;
230 /* FIXME: maybe we have to admit that DV is a
231 * big-endian PCM */
232 ✗ pcm[of * 2] = rc & 0xff;
233 ✗ pcm[of * 2 + 1] = rc >> 8;
234 ✗ ++d;
235 }
236 }
237
238 13608 frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
239 }
240 }
241 }
242
243 131 return size;
244 }
245
246 1147 static int dv_extract_audio_info(DVDemuxContext *c, const uint8_t *frame)
247 {
248 const uint8_t *as_pack;
249 int freq, stype, smpls, quant, i, ach, sr;
250
251 1147 as_pack = dv_extract_pack(frame, DV_AUDIO_SOURCE);
252
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 1147 if (!as_pack || !c->sys) { /* No audio ? */
253 1016 c->ach = 0;
254 1016 return 0;
255 }
256
257 131 smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
258 131 freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */
259 131 stype = as_pack[3] & 0x1f; /* 0 - 2CH, 2 - 4CH, 3 - 8CH */
260 131 quant = as_pack[4] & 0x07; /* 0 - 16-bit linear, 1 - 12-bit nonlinear */
261
262
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 131 if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency)) {
263 ✗ av_log(c->fctx, AV_LOG_ERROR,
264 "Unrecognized audio sample rate index (%d)\n", freq);
265 ✗ return 0;
266 }
267 131 sr = dv_audio_frequency[freq];
268
269
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 131 if (stype > 3) {
270 ✗ av_log(c->fctx, AV_LOG_ERROR, "stype %d is invalid\n", stype);
271 ✗ c->ach = 0;
272 ✗ return 0;
273 }
274
275 /* note: ach counts PAIRS of channels (i.e. stereo channels) */
276 131 ach = ((int[4]) { 1, 0, 2, 4 })[stype];
277
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 131 if (ach == 1 && quant && freq == 2)
278 ✗ ach = 2;
279
280 /* Dynamic handling of the audio streams in DV */
281 131 c->ach = 0;
282
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 262 for (i = 0; i < ach; i++) {
283
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 131 if (!c->ast[i]) {
284 5 c->ast[i] = avformat_new_stream(c->fctx, NULL);
285
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 5 if (!c->ast[i])
286 ✗ return AVERROR(ENOMEM);
287
288 5 avpriv_set_pts_info(c->ast[i], 64, 1, DV_TIMESCALE_AUDIO);
289 5 c->ast[i]->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
290 5 c->ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
291 5 c->ast[i]->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
292 5 c->ast[i]->start_time = 0;
293 5 c->ast[i]->codecpar->bit_rate = 2 * sr * 16;
294
295 5 c->ast[i]->codecpar->sample_rate = sr;
296 5 c->audio_pkt[i].last_sample_rate = sr;
297
298 5 c->audio_pkt[i].size = 0;
299 5 c->audio_pkt[i].data = c->audio_buf[i];
300 5 c->audio_pkt[i].stream_index = c->ast[i]->index;
301 5 c->audio_pkt[i].flags |= AV_PKT_FLAG_KEY;
302 5 c->audio_pkt[i].pts = AV_NOPTS_VALUE;
303 5 c->audio_pkt[i].duration = 0;
304 5 c->audio_pkt[i].pos = -1;
305 }
306
307 131 c->audio_pkt[i].sample_rate = sr;
308 }
309 131 c->ach = ach;
310
311 131 return (c->sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
312 }
313
314 1147 static int dv_extract_video_info(DVDemuxContext *c, const uint8_t *frame)
315 {
316 const uint8_t *vsc_pack;
317 AVCodecParameters *par;
318 int apt, is16_9;
319
320 1147 par = c->vst->codecpar;
321
322 1147 c->vst->avg_frame_rate = av_inv_q(c->vst->time_base);
323
324 /* finding out SAR is a little bit messy */
325 1147 vsc_pack = dv_extract_pack(frame, DV_VIDEO_CONTROL);
326 1147 apt = frame[4] & 0x07;
327
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 1460 is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||
328
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 313 (!apt && (vsc_pack[2] & 0x07) == 0x07)));
329 1147 c->vst->sample_aspect_ratio = c->sys->sar[is16_9];
330 1147 par->bit_rate = av_rescale_q(c->sys->frame_size,
331 1147 (AVRational) { 8, 1 },
332 1147 c->sys->time_base);
333 1147 return c->sys->frame_size;
334 }
335
336 25 static int dv_extract_timecode(DVDemuxContext* c, const uint8_t* frame, char *tc)
337 {
338 const uint8_t *tc_pack;
339
340 // For PAL systems, drop frame bit is replaced by an arbitrary
341 // bit so its value should not be considered. Drop frame timecode
342 // is only relevant for NTSC systems.
343
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 25 int prevent_df = c->sys->ltc_divisor == 25 || c->sys->ltc_divisor == 50;
344
345 25 tc_pack = dv_extract_pack(frame, DV_TIMECODE);
346
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 25 if (!tc_pack)
347 ✗ return 0;
348 25 av_timecode_make_smpte_tc_string2(tc, av_inv_q(c->sys->time_base), AV_RB32(tc_pack + 1), prevent_df, 1);
349 25 return 1;
350 }
351
352 /* The following 3 functions constitute our interface to the world */
353
354 25 static int dv_init_demux(AVFormatContext *s, DVDemuxContext *c)
355 {
356 25 c->vst = avformat_new_stream(s, NULL);
357
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 25 if (!c->vst)
358 ✗ return AVERROR(ENOMEM);
359
360 25 c->fctx = s;
361 25 c->vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
362 25 c->vst->codecpar->codec_id = AV_CODEC_ID_DVVIDEO;
363 25 c->vst->start_time = 0;
364
365 25 avpriv_set_pts_info(c->vst, 64, 1, DV_TIMESCALE_VIDEO);
366
367 /* Audio streams are added later as they are encountered. */
368 25 s->ctx_flags |= AVFMTCTX_NOHEADER;
369
370 25 return 0;
371 }
372
373 ✗ DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s)
374 {
375 DVDemuxContext *c;
376
377 ✗ c = av_mallocz(sizeof(DVDemuxContext));
378 ✗ if (!c)
379 ✗ return NULL;
380
381 ✗ if (dv_init_demux(s, c)) {
382 ✗ av_free(c);
383 ✗ return NULL;
384 }
385
386 ✗ return c;
387 }
388
389 1277 int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
390 {
391 1277 int size = -1;
392 int i;
393
394
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 1411 for (i = 0; i < c->ach; i++) {
395
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 239 if (c->ast[i] && c->audio_pkt[i].size) {
396 105 DVPacket *dpkt = &c->audio_pkt[i];
397
398 105 pkt->size = dpkt->size;
399 105 pkt->data = dpkt->data;
400 105 pkt->stream_index = dpkt->stream_index;
401 105 pkt->flags = dpkt->flags;
402 105 pkt->pts = dpkt->pts;
403 105 pkt->duration = dpkt->duration;
404 105 pkt->pos = dpkt->pos;
405
406 105 dpkt->size = 0;
407 105 size = pkt->size;
408
409
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 105 if (dpkt->last_sample_rate != dpkt->sample_rate) {
410 ✗ int ret = ff_add_param_change(pkt, 0, 0, dpkt->sample_rate, 0, 0);
411 ✗ if (ret < 0)
412 ✗ return ret;
413 ✗ dpkt->last_sample_rate = dpkt->sample_rate;
414 }
415
416 105 break;
417 }
418 }
419
420 1277 return size;
421 }
422
423 1147 int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
424 uint8_t *buf, int buf_size, int64_t pos)
425 {
426 int64_t pts, duration;
427 int size, i;
428 1147 uint8_t *ppcm[5] = { 0 };
429
430
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 1147 if (buf_size < DV_PROFILE_BYTES ||
431
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 1147 !(c->sys = av_dv_frame_profile(c->sys, buf, buf_size)) ||
432
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 1147 buf_size < c->sys->frame_size) {
433 ✗ return AVERROR_INVALIDDATA;
434 }
435
436 /* Queueing audio packet */
437 /* FIXME: in case of no audio/bad audio we have to do something */
438 1147 size = dv_extract_audio_info(c, buf);
439
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 1147 if (size < 0)
440 ✗ return size;
441
442
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 1147 if (c->ach) {
443 131 int64_t next_pts_video = av_rescale_q(c->next_pts_video, c->vst->time_base,
444 131 c->ast[0]->time_base);
445
446 131 duration = av_rescale_q(size / 4,
447 131 (AVRational){ 1, c->audio_pkt[0].sample_rate },
448 131 c->ast[0]->time_base);
449
450 // if audio timestamps are more than one frame away from video,
451 // assume desync happened (e.g. due to dropped audio frames) and
452 // resynchronize
453 262 pts = (FFABS(next_pts_video - c->next_pts_audio) >= duration) ?
454
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 131 next_pts_video : c->next_pts_audio;
455
456 131 c->next_pts_audio = pts + duration;
457 }
458
459
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 1278 for (i = 0; i < c->ach; i++) {
460 131 DVPacket *dpkt = &c->audio_pkt[i];
461
462 131 dpkt->pos = pos;
463 131 dpkt->size = size;
464 131 dpkt->pts = pts;
465 131 dpkt->duration = duration;
466
467 131 ppcm[i] = c->audio_buf[i];
468 }
469
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 1147 if (c->ach)
470 131 dv_extract_audio(buf, ppcm, c->sys);
471
472 /* We work with 720p frames split in half, thus even frames have
473 * channels 0,1 and odd 2,3. */
474
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 1147 if (c->sys->height == 720) {
475
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 200 if (buf[1] & 0x0C) {
476 100 c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
477 } else {
478 100 c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
479 }
480 }
481
482 /* return the video packet, if the caller wants it */
483
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 1147 if (pkt) {
484 1147 size = dv_extract_video_info(c, buf);
485
486 1147 pkt->data = buf;
487 1147 pkt->pos = pos;
488 1147 pkt->size = size;
489 1147 pkt->flags |= AV_PKT_FLAG_KEY;
490 1147 pkt->stream_index = c->vst->index;
491 1147 pkt->pts = c->next_pts_video;
492 1147 pkt->duration = av_rescale_q(1, c->sys->time_base, c->vst->time_base);
493
494 1147 c->next_pts_video += pkt->duration;
495 }
496
497 1147 c->frames++;
498
499 1147 return size;
500 }
501
502 104 static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
503 int64_t *timestamp)
504 {
505 // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
506 104 FFFormatContext *const si = ffformatcontext(s);
507 104 const int frame_size = c->sys->frame_size;
508 104 int64_t frame_count = av_rescale_q(*timestamp, c->vst->time_base, c->sys->time_base);
509 int64_t offset;
510 104 int64_t size = avio_size(s->pb) - si->data_offset;
511 104 int64_t max_offset = ((size - 1) / frame_size) * frame_size;
512
513 104 offset = frame_size * frame_count;
514
515
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 104 if (size >= 0 && offset > max_offset)
516 30 offset = max_offset;
517
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 74 else if (offset < 0)
518 32 offset = 0;
519
520 104 *timestamp = av_rescale_q(offset / frame_size, c->sys->time_base, c->vst->time_base);
521
522 104 return offset + si->data_offset;
523 }
524
525 104 void ff_dv_ts_reset(DVDemuxContext *c, int64_t ts)
526 {
527
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 104 c->frames = !c->sys ? 0 :
528 104 av_rescale_q(ts, c->vst->time_base, c->sys->time_base);
529 104 c->next_pts_video = ts;
530
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 104 c->next_pts_audio = (!c->sys || !c->ast[0]) ? AV_NOPTS_VALUE :
531 26 av_rescale_q(ts, c->vst->time_base, c->ast[0]->time_base);
532
533 104 c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
534 104 c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
535 104 }
536
537 /************************************************************
538 * Implementation of the easiest DV storage of all -- raw DV.
539 ************************************************************/
540
541 typedef struct RawDVContext {
542 DVDemuxContext dv_demux;
543 uint8_t buf[DV_MAX_FRAME_SIZE];
544 } RawDVContext;
545
546 25 static int dv_read_timecode(AVFormatContext *s) {
547 int ret;
548 char timecode[AV_TIMECODE_STR_SIZE];
549 25 int64_t pos = avio_tell(s->pb);
550
551 // Read 3 DIF blocks: Header block and 2 Subcode blocks.
552 #define PARTIAL_FRAME_SIZE (3 * 80)
553 uint8_t partial_frame[PARTIAL_FRAME_SIZE];
554 25 RawDVContext *c = s->priv_data;
555
556 25 ret = avio_read(s->pb, partial_frame, PARTIAL_FRAME_SIZE);
557
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 25 if (ret < 0)
558 ✗ goto finish;
559
560
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 25 if (ret < PARTIAL_FRAME_SIZE) {
561 ✗ ret = -1;
562 ✗ goto finish;
563 }
564
565 25 ret = dv_extract_timecode(&c->dv_demux, partial_frame, timecode);
566
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 25 if (ret)
567 25 av_dict_set(&s->metadata, "timecode", timecode, 0);
568 else
569 ✗ av_log(s, AV_LOG_ERROR, "Detected timecode is invalid\n");
570
571 25 finish:
572 25 avio_seek(s->pb, pos, SEEK_SET);
573 25 return ret;
574 }
575
576 25 static int dv_read_header(AVFormatContext *s)
577 {
578 25 unsigned state, marker_pos = 0;
579 25 RawDVContext *c = s->priv_data;
580 int64_t ret64;
581 int ret;
582
583
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 25 if ((ret = dv_init_demux(s, &c->dv_demux)) < 0)
584 ✗ return ret;
585
586 25 state = avio_rb32(s->pb);
587
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 25 while ((state & 0xffffff7f) != 0x1f07003f) {
588 ✗ if (avio_feof(s->pb)) {
589 ✗ av_log(s, AV_LOG_ERROR, "Cannot find DV header.\n");
590 ✗ return AVERROR_INVALIDDATA;
591 }
592 ✗ if (state == 0x003f0700 || state == 0xff3f0700)
593 ✗ marker_pos = avio_tell(s->pb);
594 ✗ if (state == 0xff3f0701 && avio_tell(s->pb) - marker_pos == 80) {
595 ✗ avio_seek(s->pb, -163, SEEK_CUR);
596 ✗ state = avio_rb32(s->pb);
597 ✗ break;
598 }
599 ✗ state = (state << 8) | avio_r8(s->pb);
600 }
601 25 AV_WB32(c->buf, state);
602
603
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 25 if ((ret = ffio_read_size(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4)) < 0)
604 ✗ return ret;
605
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 25 if ((ret64 = avio_seek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR)) < 0)
606 ✗ return (int)ret64;
607
608 50 c->dv_demux.sys = av_dv_frame_profile(c->dv_demux.sys,
609 25 c->buf,
610 DV_PROFILE_BYTES);
611
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 25 if (!c->dv_demux.sys) {
612 ✗ av_log(s, AV_LOG_ERROR,
613 "Can't determine profile of DV input stream.\n");
614 ✗ return AVERROR_INVALIDDATA;
615 }
616
617 25 s->bit_rate = av_rescale_q(c->dv_demux.sys->frame_size,
618 25 (AVRational) { 8, 1 },
619 25 c->dv_demux.sys->time_base);
620
621
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 25 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
622 25 dv_read_timecode(s);
623
624 25 return 0;
625 }
626
627 1277 static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
628 {
629 int size;
630 1277 RawDVContext *c = s->priv_data;
631
632 1277 size = avpriv_dv_get_packet(&c->dv_demux, pkt);
633
634
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 1277 if (size < 0) {
635 int ret;
636 1172 int64_t pos = avio_tell(s->pb);
637
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 1172 if (!c->dv_demux.sys)
638 ✗ return AVERROR_INVALIDDATA;
639 1172 size = c->dv_demux.sys->frame_size;
640 1172 ret = avio_read(s->pb, c->buf, size);
641
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 1172 if (ret < 0) {
642 25 return ret;
643
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 1147 } else if (ret == 0) {
644 ✗ return AVERROR_INVALIDDATA;
645 }
646
647 1147 size = avpriv_dv_produce_packet(&c->dv_demux, pkt, c->buf, size, pos);
648 }
649
650 1252 return size;
651 }
652
653 104 static int dv_read_seek(AVFormatContext *s, int stream_index,
654 int64_t timestamp, int flags)
655 {
656 104 RawDVContext *r = s->priv_data;
657 104 DVDemuxContext *c = &r->dv_demux;
658 int64_t offset;
659
660 // seek using the video stream
661
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 104 if (stream_index != c->vst->index)
662 8 timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base,
663 8 c->vst->time_base);
664
665 104 offset = dv_frame_offset(s, c, &timestamp);
666
667
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 104 if (avio_seek(s->pb, offset, SEEK_SET) < 0)
668 ✗ return -1;
669
670 104 ff_dv_ts_reset(c, timestamp);
671 104 return 0;
672 }
673
674 7480 static int dv_probe(const AVProbeData *p)
675 {
676 7480 unsigned marker_pos = 0;
677 int i;
678 7480 int matches = 0;
679 7480 int firstmatch = 0;
680 7480 int secondary_matches = 0;
681
682
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 7480 if (p->buf_size < 5)
683 ✗ return 0;
684
685
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 417582117 for (i = 0; i < p->buf_size-4; i++) {
686 417574637 unsigned state = AV_RB32(p->buf+i);
687
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 417574637 if ((state & 0x0007f840) == 0x00070000) {
688 // any section header, also with seq/chan num != 0,
689 // should appear around every 12000 bytes, at least 10 per frame
690
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 2280752 if ((state & 0xff07ff7f) == 0x1f07003f) {
691 31 secondary_matches++;
692
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 31 if ((state & 0xffffff7f) == 0x1f07003f) {
693 27 matches++;
694
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 27 if (!i)
695 25 firstmatch = 1;
696 }
697 }
698
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 2280752 if (state == 0x003f0700 || state == 0xff3f0700)
699 38 marker_pos = i;
700
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 2280752 if (state == 0xff3f0701 && i - marker_pos == 80)
701 27 matches++;
702 }
703 }
704
705
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 7480 if (matches && p->buf_size / matches < 1024 * 1024) {
706
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 27 if (matches > 4 || firstmatch ||
707 ✗ (secondary_matches >= 10 &&
708 ✗ p->buf_size / secondary_matches < 24000))
709 // not max to avoid dv in mov to match
710 25 return AVPROBE_SCORE_MAX * 3 / 4;
711 2 return AVPROBE_SCORE_MAX / 4;
712 }
713 7453 return 0;
714 }
715
716 const FFInputFormat ff_dv_demuxer = {
717 .p.name = "dv",
718 .p.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
719 .p.extensions = "dv,dif",
720 .priv_data_size = sizeof(RawDVContext),
721 .read_probe = dv_probe,
722 .read_header = dv_read_header,
723 .read_packet = dv_read_packet,
724 .read_seek = dv_read_seek,
725 };
726
727 #else // CONFIG_DV_DEMUXER
728 DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s)
729 {
730 return NULL;
731 }
732
733 int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
734 {
735 return AVERROR(ENOSYS);
736 }
737
738 int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
739 uint8_t *buf, int buf_size, int64_t pos)
740 {
741 return AVERROR(ENOSYS);
742 }
743 #endif // CONFIG_DV_DEMUXER
744