FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/dv.c
Date: 2024-04-17 23:49:55
Exec Total Coverage
Lines: 270 362 74.6%
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 "demux.h"
37 #include "internal.h"
38 #include "libavcodec/dv_profile.h"
39 #include "libavcodec/dv.h"
40 #include "libavutil/channel_layout.h"
41 #include "libavutil/intreadwrite.h"
42 #include "libavutil/mathematics.h"
43 #include "libavutil/mem.h"
44 #include "libavutil/timecode.h"
45 #include "dv.h"
46 #include "libavutil/avassert.h"
47
48 #if CONFIG_DV_DEMUXER
49
50 // Must be kept in sync with AVPacket
51 typedef struct DVPacket {
52 int64_t pts;
53 uint8_t *data;
54 int size;
55 int stream_index;
56 int flags;
57 int64_t pos;
58 int64_t duration;
59
60 int sample_rate;
61 int last_sample_rate;
62 } DVPacket;
63
64 struct DVDemuxContext {
65 const AVDVProfile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
66 AVFormatContext* fctx;
67 AVStream* vst;
68 AVStream* ast[4];
69 struct DVPacket audio_pkt[4];
70 uint8_t audio_buf[4][8192];
71 int ach;
72 int frames;
73
74 int64_t next_pts_video;
75 int64_t next_pts_audio;
76 };
77
78 ✗ static inline uint16_t dv_audio_12to16(uint16_t sample)
79 {
80 uint16_t shift, result;
81
82 ✗ sample = (sample < 0x800) ? sample : sample | 0xf000;
83 ✗ shift = (sample & 0xf00) >> 8;
84
85 ✗ if (shift < 0x2 || shift > 0xd) {
86 ✗ result = sample;
87 ✗ } else if (shift < 0x8) {
88 ✗ shift--;
89 ✗ result = (sample - (256 * shift)) << shift;
90 } else {
91 ✗ shift = 0xe - shift;
92 ✗ result = ((sample + ((256 * shift) + 1)) << shift) - 1;
93 }
94
95 ✗ return result;
96 }
97
98 2450 static const uint8_t *dv_extract_pack(const uint8_t *frame, enum DVPackType t)
99 {
100 int offs;
101 int c;
102
103
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104
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 11594 switch (t) {
105 10422 case DV_AUDIO_SOURCE:
106
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 10422 if (c&1) offs = (80 * 6 + 80 * 16 * 0 + 3 + c*12000);
107 5342 else offs = (80 * 6 + 80 * 16 * 3 + 3 + c*12000);
108 10422 break;
109 ✗ case DV_AUDIO_CONTROL:
110 ✗ if (c&1) offs = (80 * 6 + 80 * 16 * 1 + 3 + c*12000);
111 ✗ else offs = (80 * 6 + 80 * 16 * 4 + 3 + c*12000);
112 ✗ break;
113 1147 case DV_VIDEO_CONTROL:
114
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 1147 if (c&1) offs = (80 * 3 + 8 + c*12000);
115 1147 else offs = (80 * 5 + 48 + 5 + c*12000);
116 1147 break;
117 25 case DV_TIMECODE:
118 25 offs = (80*1 + 3 + 3);
119 25 break;
120 ✗ default:
121 ✗ return NULL;
122 }
123
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 11594 if (frame[offs] == t)
124 1434 break;
125 }
126
127
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 2450 return frame[offs] == t ? &frame[offs] : NULL;
128 }
129
130 static const int dv_audio_frequency[3] = {
131 48000, 44100, 32000,
132 };
133
134 /*
135 * There's a couple of assumptions being made here:
136 * 1. By default we silence erroneous (0x8000/16-bit 0x800/12-bit) audio samples.
137 * We can pass them upwards when libavcodec will be ready to deal with them.
138 * 2. We don't do software emphasis.
139 * 3. Audio is always returned as 16-bit linear samples: 12-bit nonlinear samples
140 * are converted into 16-bit linear ones.
141 */
142 131 static int dv_extract_audio(const uint8_t *frame, uint8_t **ppcm,
143 const AVDVProfile *sys)
144 {
145 int size, chan, i, j, d, of, smpls, freq, quant, half_ch;
146 uint16_t lc, rc;
147 const uint8_t *as_pack;
148 uint8_t *pcm, ipcm;
149
150 131 as_pack = dv_extract_pack(frame, DV_AUDIO_SOURCE);
151
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 131 if (!as_pack) /* No audio ? */
152 ✗ return 0;
153
154 131 smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
155 131 freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */
156 131 quant = as_pack[4] & 0x07; /* 0 - 16-bit linear, 1 - 12-bit nonlinear */
157
158
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 131 if (quant > 1)
159 ✗ return -1; /* unsupported quantization */
160
161
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 131 if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency))
162 ✗ return AVERROR_INVALIDDATA;
163
164 131 size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
165 131 half_ch = sys->difseg_size / 2;
166
167 /* We work with 720p frames split in half, thus even frames have
168 * channels 0,1 and odd 2,3. */
169
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 131 ipcm = (sys->height == 720 && !(frame[1] & 0x0C)) ? 2 : 0;
170
171
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 131 if (ipcm + sys->n_difchan > (quant == 1 ? 2 : 4)) {
172 ✗ av_log(NULL, AV_LOG_ERROR, "too many dv pcm frames\n");
173 ✗ return AVERROR_INVALIDDATA;
174 }
175
176 /* for each DIF channel */
177
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 262 for (chan = 0; chan < sys->n_difchan; chan++) {
178
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 131 av_assert0(ipcm<4);
179 131 pcm = ppcm[ipcm++];
180
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 131 if (!pcm)
181 ✗ break;
182
183 /* for each DIF segment */
184
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 1643 for (i = 0; i < sys->difseg_size; i++) {
185 1512 frame += 6 * 80; /* skip DIF segment header */
186
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 1512 if (quant == 1 && i == half_ch) {
187 /* next stereo channel (12-bit mode only) */
188 ✗ av_assert0(ipcm<4);
189 ✗ pcm = ppcm[ipcm++];
190 ✗ if (!pcm)
191 ✗ break;
192 }
193
194 /* for each AV sequence */
195
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 15120 for (j = 0; j < 9; j++) {
196
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 503496 for (d = 8; d < 80; d += 2) {
197
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 489888 if (quant == 0) { /* 16-bit quantization */
198 489888 of = sys->audio_shuffle[i][j] +
199 489888 (d - 8) / 2 * sys->audio_stride;
200
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 489888 if (of * 2 >= size)
201 5956 continue;
202
203 /* FIXME: maybe we have to admit that DV is a
204 * big-endian PCM */
205 483932 pcm[of * 2] = frame[d + 1];
206 483932 pcm[of * 2 + 1] = frame[d];
207
208
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 483932 if (pcm[of * 2 + 1] == 0x80 && pcm[of * 2] == 0x00)
209 ✗ pcm[of * 2 + 1] = 0;
210 } else { /* 12-bit quantization */
211 ✗ lc = ((uint16_t)frame[d] << 4) |
212 ✗ ((uint16_t)frame[d + 2] >> 4);
213 ✗ rc = ((uint16_t)frame[d + 1] << 4) |
214 ✗ ((uint16_t)frame[d + 2] & 0x0f);
215 ✗ lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
216 ✗ rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
217
218 ✗ of = sys->audio_shuffle[i % half_ch][j] +
219 ✗ (d - 8) / 3 * sys->audio_stride;
220 ✗ if (of * 2 >= size)
221 ✗ continue;
222
223 /* FIXME: maybe we have to admit that DV is a
224 * big-endian PCM */
225 ✗ pcm[of * 2] = lc & 0xff;
226 ✗ pcm[of * 2 + 1] = lc >> 8;
227 ✗ of = sys->audio_shuffle[i % half_ch + half_ch][j] +
228 ✗ (d - 8) / 3 * sys->audio_stride;
229 /* FIXME: maybe we have to admit that DV is a
230 * big-endian PCM */
231 ✗ pcm[of * 2] = rc & 0xff;
232 ✗ pcm[of * 2 + 1] = rc >> 8;
233 ✗ ++d;
234 }
235 }
236
237 13608 frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
238 }
239 }
240 }
241
242 131 return size;
243 }
244
245 1147 static int dv_extract_audio_info(DVDemuxContext *c, const uint8_t *frame)
246 {
247 const uint8_t *as_pack;
248 int freq, stype, smpls, quant, i, ach, sr;
249
250 1147 as_pack = dv_extract_pack(frame, DV_AUDIO_SOURCE);
251
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 1147 if (!as_pack || !c->sys) { /* No audio ? */
252 1016 c->ach = 0;
253 1016 return 0;
254 }
255
256 131 smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
257 131 freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */
258 131 stype = as_pack[3] & 0x1f; /* 0 - 2CH, 2 - 4CH, 3 - 8CH */
259 131 quant = as_pack[4] & 0x07; /* 0 - 16-bit linear, 1 - 12-bit nonlinear */
260
261
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 131 if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency)) {
262 ✗ av_log(c->fctx, AV_LOG_ERROR,
263 "Unrecognized audio sample rate index (%d)\n", freq);
264 ✗ return 0;
265 }
266 131 sr = dv_audio_frequency[freq];
267
268
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 131 if (stype > 3) {
269 ✗ av_log(c->fctx, AV_LOG_ERROR, "stype %d is invalid\n", stype);
270 ✗ c->ach = 0;
271 ✗ return 0;
272 }
273
274 /* note: ach counts PAIRS of channels (i.e. stereo channels) */
275 131 ach = ((int[4]) { 1, 0, 2, 4 })[stype];
276
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 131 if (ach == 1 && quant && freq == 2)
277 ✗ ach = 2;
278
279 /* Dynamic handling of the audio streams in DV */
280 131 c->ach = 0;
281
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 262 for (i = 0; i < ach; i++) {
282
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 131 if (!c->ast[i]) {
283 5 c->ast[i] = avformat_new_stream(c->fctx, NULL);
284
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 5 if (!c->ast[i])
285 ✗ return AVERROR(ENOMEM);
286
287 5 avpriv_set_pts_info(c->ast[i], 64, 1, DV_TIMESCALE_AUDIO);
288 5 c->ast[i]->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
289 5 c->ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
290 5 c->ast[i]->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
291 5 c->ast[i]->start_time = 0;
292 5 c->ast[i]->codecpar->bit_rate = 2 * sr * 16;
293
294 5 c->ast[i]->codecpar->sample_rate = sr;
295 5 c->audio_pkt[i].last_sample_rate = sr;
296
297 5 c->audio_pkt[i].size = 0;
298 5 c->audio_pkt[i].data = c->audio_buf[i];
299 5 c->audio_pkt[i].stream_index = c->ast[i]->index;
300 5 c->audio_pkt[i].flags |= AV_PKT_FLAG_KEY;
301 5 c->audio_pkt[i].pts = AV_NOPTS_VALUE;
302 5 c->audio_pkt[i].duration = 0;
303 5 c->audio_pkt[i].pos = -1;
304 }
305
306 131 c->audio_pkt[i].sample_rate = sr;
307 }
308 131 c->ach = ach;
309
310 131 return (c->sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
311 }
312
313 1147 static int dv_extract_video_info(DVDemuxContext *c, const uint8_t *frame)
314 {
315 const uint8_t *vsc_pack;
316 AVCodecParameters *par;
317 int apt, is16_9;
318
319 1147 par = c->vst->codecpar;
320
321 1147 c->vst->avg_frame_rate = av_inv_q(c->vst->time_base);
322
323 /* finding out SAR is a little bit messy */
324 1147 vsc_pack = dv_extract_pack(frame, DV_VIDEO_CONTROL);
325 1147 apt = frame[4] & 0x07;
326
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 1460 is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||
327
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 313 (!apt && (vsc_pack[2] & 0x07) == 0x07)));
328 1147 c->vst->sample_aspect_ratio = c->sys->sar[is16_9];
329 1147 par->bit_rate = av_rescale_q(c->sys->frame_size,
330 1147 (AVRational) { 8, 1 },
331 1147 c->sys->time_base);
332 1147 return c->sys->frame_size;
333 }
334
335 25 static int dv_extract_timecode(DVDemuxContext* c, const uint8_t* frame, char *tc)
336 {
337 const uint8_t *tc_pack;
338
339 // For PAL systems, drop frame bit is replaced by an arbitrary
340 // bit so its value should not be considered. Drop frame timecode
341 // is only relevant for NTSC systems.
342
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 25 int prevent_df = c->sys->ltc_divisor == 25 || c->sys->ltc_divisor == 50;
343
344 25 tc_pack = dv_extract_pack(frame, DV_TIMECODE);
345
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 25 if (!tc_pack)
346 ✗ return 0;
347 25 av_timecode_make_smpte_tc_string2(tc, av_inv_q(c->sys->time_base), AV_RB32(tc_pack + 1), prevent_df, 1);
348 25 return 1;
349 }
350
351 /* The following 3 functions constitute our interface to the world */
352
353 25 static int dv_init_demux(AVFormatContext *s, DVDemuxContext *c)
354 {
355 25 c->vst = avformat_new_stream(s, NULL);
356
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 25 if (!c->vst)
357 ✗ return AVERROR(ENOMEM);
358
359 25 c->fctx = s;
360 25 c->vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
361 25 c->vst->codecpar->codec_id = AV_CODEC_ID_DVVIDEO;
362 25 c->vst->start_time = 0;
363
364 25 avpriv_set_pts_info(c->vst, 64, 1, DV_TIMESCALE_VIDEO);
365
366 /* Audio streams are added later as they are encountered. */
367 25 s->ctx_flags |= AVFMTCTX_NOHEADER;
368
369 25 return 0;
370 }
371
372 ✗ DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s)
373 {
374 DVDemuxContext *c;
375
376 ✗ c = av_mallocz(sizeof(DVDemuxContext));
377 ✗ if (!c)
378 ✗ return NULL;
379
380 ✗ if (dv_init_demux(s, c)) {
381 ✗ av_free(c);
382 ✗ return NULL;
383 }
384
385 ✗ return c;
386 }
387
388 1277 int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
389 {
390 1277 int size = -1;
391 int i;
392
393
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 1411 for (i = 0; i < c->ach; i++) {
394
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 239 if (c->ast[i] && c->audio_pkt[i].size) {
395 105 DVPacket *dpkt = &c->audio_pkt[i];
396
397 105 pkt->size = dpkt->size;
398 105 pkt->data = dpkt->data;
399 105 pkt->stream_index = dpkt->stream_index;
400 105 pkt->flags = dpkt->flags;
401 105 pkt->pts = dpkt->pts;
402 105 pkt->duration = dpkt->duration;
403 105 pkt->pos = dpkt->pos;
404
405 105 dpkt->size = 0;
406 105 size = pkt->size;
407
408
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 105 if (dpkt->last_sample_rate != dpkt->sample_rate) {
409 ✗ int ret = ff_add_param_change(pkt, 0, 0, dpkt->sample_rate, 0, 0);
410 ✗ if (ret < 0)
411 ✗ return ret;
412 ✗ dpkt->last_sample_rate = dpkt->sample_rate;
413 }
414
415 105 break;
416 }
417 }
418
419 1277 return size;
420 }
421
422 1147 int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
423 uint8_t *buf, int buf_size, int64_t pos)
424 {
425 int64_t pts, duration;
426 int size, i;
427 1147 uint8_t *ppcm[5] = { 0 };
428
429
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 1147 if (buf_size < DV_PROFILE_BYTES ||
430
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 1147 !(c->sys = av_dv_frame_profile(c->sys, buf, buf_size)) ||
431
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 1147 buf_size < c->sys->frame_size) {
432 ✗ return AVERROR_INVALIDDATA;
433 }
434
435 /* Queueing audio packet */
436 /* FIXME: in case of no audio/bad audio we have to do something */
437 1147 size = dv_extract_audio_info(c, buf);
438
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 1147 if (size < 0)
439 ✗ return size;
440
441
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 1147 if (c->ach) {
442 131 int64_t next_pts_video = av_rescale_q(c->next_pts_video, c->vst->time_base,
443 131 c->ast[0]->time_base);
444
445 131 duration = av_rescale_q(size / 4,
446 131 (AVRational){ 1, c->audio_pkt[0].sample_rate },
447 131 c->ast[0]->time_base);
448
449 // if audio timestamps are more than one frame away from video,
450 // assume desync happened (e.g. due to dropped audio frames) and
451 // resynchronize
452 262 pts = (FFABS(next_pts_video - c->next_pts_audio) >= duration) ?
453
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 131 next_pts_video : c->next_pts_audio;
454
455 131 c->next_pts_audio = pts + duration;
456 }
457
458
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 1278 for (i = 0; i < c->ach; i++) {
459 131 DVPacket *dpkt = &c->audio_pkt[i];
460
461 131 dpkt->pos = pos;
462 131 dpkt->size = size;
463 131 dpkt->pts = pts;
464 131 dpkt->duration = duration;
465
466 131 ppcm[i] = c->audio_buf[i];
467 }
468
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 1147 if (c->ach)
469 131 dv_extract_audio(buf, ppcm, c->sys);
470
471 /* We work with 720p frames split in half, thus even frames have
472 * channels 0,1 and odd 2,3. */
473
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 1147 if (c->sys->height == 720) {
474
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 200 if (buf[1] & 0x0C) {
475 100 c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
476 } else {
477 100 c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
478 }
479 }
480
481 /* return the video packet, if the caller wants it */
482
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 1147 if (pkt) {
483 1147 size = dv_extract_video_info(c, buf);
484
485 1147 pkt->data = buf;
486 1147 pkt->pos = pos;
487 1147 pkt->size = size;
488 1147 pkt->flags |= AV_PKT_FLAG_KEY;
489 1147 pkt->stream_index = c->vst->index;
490 1147 pkt->pts = c->next_pts_video;
491 1147 pkt->duration = av_rescale_q(1, c->sys->time_base, c->vst->time_base);
492
493 1147 c->next_pts_video += pkt->duration;
494 }
495
496 1147 c->frames++;
497
498 1147 return size;
499 }
500
501 104 static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
502 int64_t *timestamp)
503 {
504 // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
505 104 FFFormatContext *const si = ffformatcontext(s);
506 104 const int frame_size = c->sys->frame_size;
507 104 int64_t frame_count = av_rescale_q(*timestamp, c->vst->time_base, c->sys->time_base);
508 int64_t offset;
509 104 int64_t size = avio_size(s->pb) - si->data_offset;
510 104 int64_t max_offset = ((size - 1) / frame_size) * frame_size;
511
512 104 offset = frame_size * frame_count;
513
514
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 104 if (size >= 0 && offset > max_offset)
515 30 offset = max_offset;
516
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 74 else if (offset < 0)
517 32 offset = 0;
518
519 104 *timestamp = av_rescale_q(offset / frame_size, c->sys->time_base, c->vst->time_base);
520
521 104 return offset + si->data_offset;
522 }
523
524 104 void ff_dv_ts_reset(DVDemuxContext *c, int64_t ts)
525 {
526
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 104 c->frames = !c->sys ? 0 :
527 104 av_rescale_q(ts, c->vst->time_base, c->sys->time_base);
528 104 c->next_pts_video = ts;
529
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 104 c->next_pts_audio = (!c->sys || !c->ast[0]) ? AV_NOPTS_VALUE :
530 26 av_rescale_q(ts, c->vst->time_base, c->ast[0]->time_base);
531
532 104 c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
533 104 c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
534 104 }
535
536 /************************************************************
537 * Implementation of the easiest DV storage of all -- raw DV.
538 ************************************************************/
539
540 typedef struct RawDVContext {
541 DVDemuxContext dv_demux;
542 uint8_t buf[DV_MAX_FRAME_SIZE];
543 } RawDVContext;
544
545 25 static int dv_read_timecode(AVFormatContext *s) {
546 int ret;
547 char timecode[AV_TIMECODE_STR_SIZE];
548 25 int64_t pos = avio_tell(s->pb);
549
550 // Read 3 DIF blocks: Header block and 2 Subcode blocks.
551 #define PARTIAL_FRAME_SIZE (3 * 80)
552 uint8_t partial_frame[PARTIAL_FRAME_SIZE];
553 25 RawDVContext *c = s->priv_data;
554
555 25 ret = avio_read(s->pb, partial_frame, PARTIAL_FRAME_SIZE);
556
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 25 if (ret < 0)
557 ✗ goto finish;
558
559
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 25 if (ret < PARTIAL_FRAME_SIZE) {
560 ✗ ret = -1;
561 ✗ goto finish;
562 }
563
564 25 ret = dv_extract_timecode(&c->dv_demux, partial_frame, timecode);
565
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 25 if (ret)
566 25 av_dict_set(&s->metadata, "timecode", timecode, 0);
567 else
568 ✗ av_log(s, AV_LOG_ERROR, "Detected timecode is invalid\n");
569
570 25 finish:
571 25 avio_seek(s->pb, pos, SEEK_SET);
572 25 return ret;
573 }
574
575 25 static int dv_read_header(AVFormatContext *s)
576 {
577 25 unsigned state, marker_pos = 0;
578 25 RawDVContext *c = s->priv_data;
579 int ret;
580
581
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 25 if ((ret = dv_init_demux(s, &c->dv_demux)) < 0)
582 ✗ return ret;
583
584 25 state = avio_rb32(s->pb);
585
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 25 while ((state & 0xffffff7f) != 0x1f07003f) {
586 ✗ if (avio_feof(s->pb)) {
587 ✗ av_log(s, AV_LOG_ERROR, "Cannot find DV header.\n");
588 ✗ return AVERROR_INVALIDDATA;
589 }
590 ✗ if (state == 0x003f0700 || state == 0xff3f0700)
591 ✗ marker_pos = avio_tell(s->pb);
592 ✗ if (state == 0xff3f0701 && avio_tell(s->pb) - marker_pos == 80) {
593 ✗ avio_seek(s->pb, -163, SEEK_CUR);
594 ✗ state = avio_rb32(s->pb);
595 ✗ break;
596 }
597 ✗ state = (state << 8) | avio_r8(s->pb);
598 }
599 25 AV_WB32(c->buf, state);
600
601
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 50 if (avio_read(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4) != DV_PROFILE_BYTES - 4 ||
602 25 avio_seek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0) {
603 ✗ return AVERROR(EIO);
604 }
605
606 50 c->dv_demux.sys = av_dv_frame_profile(c->dv_demux.sys,
607 25 c->buf,
608 DV_PROFILE_BYTES);
609
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 25 if (!c->dv_demux.sys) {
610 ✗ av_log(s, AV_LOG_ERROR,
611 "Can't determine profile of DV input stream.\n");
612 ✗ return AVERROR_INVALIDDATA;
613 }
614
615 25 s->bit_rate = av_rescale_q(c->dv_demux.sys->frame_size,
616 25 (AVRational) { 8, 1 },
617 25 c->dv_demux.sys->time_base);
618
619
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 25 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
620 25 dv_read_timecode(s);
621
622 25 return 0;
623 }
624
625 1277 static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
626 {
627 int size;
628 1277 RawDVContext *c = s->priv_data;
629
630 1277 size = avpriv_dv_get_packet(&c->dv_demux, pkt);
631
632
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 1277 if (size < 0) {
633 int ret;
634 1172 int64_t pos = avio_tell(s->pb);
635
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 1172 if (!c->dv_demux.sys)
636 ✗ return AVERROR(EIO);
637 1172 size = c->dv_demux.sys->frame_size;
638 1172 ret = avio_read(s->pb, c->buf, size);
639
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 1172 if (ret < 0) {
640 25 return ret;
641
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 1147 } else if (ret == 0) {
642 ✗ return AVERROR(EIO);
643 }
644
645 1147 size = avpriv_dv_produce_packet(&c->dv_demux, pkt, c->buf, size, pos);
646 }
647
648 1252 return size;
649 }
650
651 104 static int dv_read_seek(AVFormatContext *s, int stream_index,
652 int64_t timestamp, int flags)
653 {
654 104 RawDVContext *r = s->priv_data;
655 104 DVDemuxContext *c = &r->dv_demux;
656 int64_t offset;
657
658 // seek using the video stream
659
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 104 if (stream_index != c->vst->index)
660 8 timestamp = av_rescale_q(timestamp, s->streams[stream_index]->time_base,
661 8 c->vst->time_base);
662
663 104 offset = dv_frame_offset(s, c, &timestamp);
664
665
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 104 if (avio_seek(s->pb, offset, SEEK_SET) < 0)
666 ✗ return -1;
667
668 104 ff_dv_ts_reset(c, timestamp);
669 104 return 0;
670 }
671
672 7125 static int dv_probe(const AVProbeData *p)
673 {
674 7125 unsigned marker_pos = 0;
675 int i;
676 7125 int matches = 0;
677 7125 int firstmatch = 0;
678 7125 int secondary_matches = 0;
679
680
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 7125 if (p->buf_size < 5)
681 ✗ return 0;
682
683
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 367557548 for (i = 0; i < p->buf_size-4; i++) {
684 367550423 unsigned state = AV_RB32(p->buf+i);
685
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 367550423 if ((state & 0x0007f840) == 0x00070000) {
686 // any section header, also with seq/chan num != 0,
687 // should appear around every 12000 bytes, at least 10 per frame
688
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 2086864 if ((state & 0xff07ff7f) == 0x1f07003f) {
689 29 secondary_matches++;
690
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 29 if ((state & 0xffffff7f) == 0x1f07003f) {
691 27 matches++;
692
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 27 if (!i)
693 25 firstmatch = 1;
694 }
695 }
696
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 2086864 if (state == 0x003f0700 || state == 0xff3f0700)
697 37 marker_pos = i;
698
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 2086864 if (state == 0xff3f0701 && i - marker_pos == 80)
699 27 matches++;
700 }
701 }
702
703
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 7125 if (matches && p->buf_size / matches < 1024 * 1024) {
704
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 27 if (matches > 4 || firstmatch ||
705 ✗ (secondary_matches >= 10 &&
706 ✗ p->buf_size / secondary_matches < 24000))
707 // not max to avoid dv in mov to match
708 25 return AVPROBE_SCORE_MAX * 3 / 4;
709 2 return AVPROBE_SCORE_MAX / 4;
710 }
711 7098 return 0;
712 }
713
714 const FFInputFormat ff_dv_demuxer = {
715 .p.name = "dv",
716 .p.long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
717 .p.extensions = "dv,dif",
718 .priv_data_size = sizeof(RawDVContext),
719 .read_probe = dv_probe,
720 .read_header = dv_read_header,
721 .read_packet = dv_read_packet,
722 .read_seek = dv_read_seek,
723 };
724
725 #else // CONFIG_DV_DEMUXER
726 DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s)
727 {
728 return NULL;
729 }
730
731 int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
732 {
733 return AVERROR(ENOSYS);
734 }
735
736 int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
737 uint8_t *buf, int buf_size, int64_t pos)
738 {
739 return AVERROR(ENOSYS);
740 }
741 #endif // CONFIG_DV_DEMUXER
742