FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/dv.c
Date: 2022-11-26 13:19:19
Exec Total Coverage
Lines: 251 343 73.2%
Branches: 123 219 56.2%

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/timecode.h"
44 #include "dv.h"
45 #include "libavutil/avassert.h"
46
47 #if CONFIG_DV_DEMUXER
48
49 // Must be kept in sync with AVPacket
50 typedef struct DVPacket {
51 int64_t pts;
52 uint8_t *data;
53 int size;
54 int stream_index;
55 int flags;
56 int64_t pos;
57 int64_t duration;
58
59 int sample_rate;
60 int last_sample_rate;
61 } DVPacket;
62
63 struct DVDemuxContext {
64 const AVDVProfile* sys; /* Current DV profile. E.g.: 525/60, 625/50 */
65 AVFormatContext* fctx;
66 AVStream* vst;
67 AVStream* ast[4];
68 struct DVPacket audio_pkt[4];
69 uint8_t audio_buf[4][8192];
70 int ach;
71 int frames;
72 };
73
74 static inline uint16_t dv_audio_12to16(uint16_t sample)
75 {
76 uint16_t shift, result;
77
78 sample = (sample < 0x800) ? sample : sample | 0xf000;
79 shift = (sample & 0xf00) >> 8;
80
81 if (shift < 0x2 || shift > 0xd) {
82 result = sample;
83 } else if (shift < 0x8) {
84 shift--;
85 result = (sample - (256 * shift)) << shift;
86 } else {
87 shift = 0xe - shift;
88 result = ((sample + ((256 * shift) + 1)) << shift) - 1;
89 }
90
91 return result;
92 }
93
94 2450 static const uint8_t *dv_extract_pack(const uint8_t *frame, enum DVPackType t)
95 {
96 int offs;
97 int c;
98
99
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100
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11594 switch (t) {
101 10422 case DV_AUDIO_SOURCE:
102
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10422 if (c&1) offs = (80 * 6 + 80 * 16 * 0 + 3 + c*12000);
103 5342 else offs = (80 * 6 + 80 * 16 * 3 + 3 + c*12000);
104 10422 break;
105 case DV_AUDIO_CONTROL:
106 if (c&1) offs = (80 * 6 + 80 * 16 * 1 + 3 + c*12000);
107 else offs = (80 * 6 + 80 * 16 * 4 + 3 + c*12000);
108 break;
109 1147 case DV_VIDEO_CONTROL:
110
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1147 if (c&1) offs = (80 * 3 + 8 + c*12000);
111 1147 else offs = (80 * 5 + 48 + 5 + c*12000);
112 1147 break;
113 25 case DV_TIMECODE:
114 25 offs = (80*1 + 3 + 3);
115 25 break;
116 default:
117 return NULL;
118 }
119
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11594 if (frame[offs] == t)
120 1434 break;
121 }
122
123
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2450 return frame[offs] == t ? &frame[offs] : NULL;
124 }
125
126 static const int dv_audio_frequency[3] = {
127 48000, 44100, 32000,
128 };
129
130 /*
131 * There's a couple of assumptions being made here:
132 * 1. By default we silence erroneous (0x8000/16-bit 0x800/12-bit) audio samples.
133 * We can pass them upwards when libavcodec will be ready to deal with them.
134 * 2. We don't do software emphasis.
135 * 3. Audio is always returned as 16-bit linear samples: 12-bit nonlinear samples
136 * are converted into 16-bit linear ones.
137 */
138 131 static int dv_extract_audio(const uint8_t *frame, uint8_t **ppcm,
139 const AVDVProfile *sys)
140 {
141 int size, chan, i, j, d, of, smpls, freq, quant, half_ch;
142 uint16_t lc, rc;
143 const uint8_t *as_pack;
144 uint8_t *pcm, ipcm;
145
146 131 as_pack = dv_extract_pack(frame, DV_AUDIO_SOURCE);
147
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131 if (!as_pack) /* No audio ? */
148 return 0;
149
150 131 smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
151 131 freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */
152 131 quant = as_pack[4] & 0x07; /* 0 - 16-bit linear, 1 - 12-bit nonlinear */
153
154
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131 if (quant > 1)
155 return -1; /* unsupported quantization */
156
157
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131 if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency))
158 return AVERROR_INVALIDDATA;
159
160 131 size = (sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
161 131 half_ch = sys->difseg_size / 2;
162
163 /* We work with 720p frames split in half, thus even frames have
164 * channels 0,1 and odd 2,3. */
165
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131 ipcm = (sys->height == 720 && !(frame[1] & 0x0C)) ? 2 : 0;
166
167
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131 if (ipcm + sys->n_difchan > (quant == 1 ? 2 : 4)) {
168 av_log(NULL, AV_LOG_ERROR, "too many dv pcm frames\n");
169 return AVERROR_INVALIDDATA;
170 }
171
172 /* for each DIF channel */
173
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262 for (chan = 0; chan < sys->n_difchan; chan++) {
174
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131 av_assert0(ipcm<4);
175 131 pcm = ppcm[ipcm++];
176
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131 if (!pcm)
177 break;
178
179 /* for each DIF segment */
180
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1643 for (i = 0; i < sys->difseg_size; i++) {
181 1512 frame += 6 * 80; /* skip DIF segment header */
182
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1512 if (quant == 1 && i == half_ch) {
183 /* next stereo channel (12-bit mode only) */
184 av_assert0(ipcm<4);
185 pcm = ppcm[ipcm++];
186 if (!pcm)
187 break;
188 }
189
190 /* for each AV sequence */
191
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15120 for (j = 0; j < 9; j++) {
192
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503496 for (d = 8; d < 80; d += 2) {
193
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489888 if (quant == 0) { /* 16-bit quantization */
194 489888 of = sys->audio_shuffle[i][j] +
195 489888 (d - 8) / 2 * sys->audio_stride;
196
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489888 if (of * 2 >= size)
197 5956 continue;
198
199 /* FIXME: maybe we have to admit that DV is a
200 * big-endian PCM */
201 483932 pcm[of * 2] = frame[d + 1];
202 483932 pcm[of * 2 + 1] = frame[d];
203
204
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483932 if (pcm[of * 2 + 1] == 0x80 && pcm[of * 2] == 0x00)
205 pcm[of * 2 + 1] = 0;
206 } else { /* 12-bit quantization */
207 lc = ((uint16_t)frame[d] << 4) |
208 ((uint16_t)frame[d + 2] >> 4);
209 rc = ((uint16_t)frame[d + 1] << 4) |
210 ((uint16_t)frame[d + 2] & 0x0f);
211 lc = (lc == 0x800 ? 0 : dv_audio_12to16(lc));
212 rc = (rc == 0x800 ? 0 : dv_audio_12to16(rc));
213
214 of = sys->audio_shuffle[i % half_ch][j] +
215 (d - 8) / 3 * sys->audio_stride;
216 if (of * 2 >= size)
217 continue;
218
219 /* FIXME: maybe we have to admit that DV is a
220 * big-endian PCM */
221 pcm[of * 2] = lc & 0xff;
222 pcm[of * 2 + 1] = lc >> 8;
223 of = sys->audio_shuffle[i % half_ch + half_ch][j] +
224 (d - 8) / 3 * sys->audio_stride;
225 /* FIXME: maybe we have to admit that DV is a
226 * big-endian PCM */
227 pcm[of * 2] = rc & 0xff;
228 pcm[of * 2 + 1] = rc >> 8;
229 ++d;
230 }
231 }
232
233 13608 frame += 16 * 80; /* 15 Video DIFs + 1 Audio DIF */
234 }
235 }
236 }
237
238 131 return size;
239 }
240
241 1147 static int dv_extract_audio_info(DVDemuxContext *c, const uint8_t *frame)
242 {
243 const uint8_t *as_pack;
244 int freq, stype, smpls, quant, i, ach, sr;
245
246 1147 as_pack = dv_extract_pack(frame, DV_AUDIO_SOURCE);
247
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1147 if (!as_pack || !c->sys) { /* No audio ? */
248 1016 c->ach = 0;
249 1016 return 0;
250 }
251
252 131 smpls = as_pack[1] & 0x3f; /* samples in this frame - min. samples */
253 131 freq = as_pack[4] >> 3 & 0x07; /* 0 - 48kHz, 1 - 44,1kHz, 2 - 32kHz */
254 131 stype = as_pack[3] & 0x1f; /* 0 - 2CH, 2 - 4CH, 3 - 8CH */
255 131 quant = as_pack[4] & 0x07; /* 0 - 16-bit linear, 1 - 12-bit nonlinear */
256
257
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131 if (freq >= FF_ARRAY_ELEMS(dv_audio_frequency)) {
258 av_log(c->fctx, AV_LOG_ERROR,
259 "Unrecognized audio sample rate index (%d)\n", freq);
260 return 0;
261 }
262 131 sr = dv_audio_frequency[freq];
263
264
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131 if (stype > 3) {
265 av_log(c->fctx, AV_LOG_ERROR, "stype %d is invalid\n", stype);
266 c->ach = 0;
267 return 0;
268 }
269
270 /* note: ach counts PAIRS of channels (i.e. stereo channels) */
271 131 ach = ((int[4]) { 1, 0, 2, 4 })[stype];
272
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131 if (ach == 1 && quant && freq == 2)
273 ach = 2;
274
275 /* Dynamic handling of the audio streams in DV */
276 131 c->ach = 0;
277
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262 for (i = 0; i < ach; i++) {
278
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131 if (!c->ast[i]) {
279 5 c->ast[i] = avformat_new_stream(c->fctx, NULL);
280
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5 if (!c->ast[i])
281 return AVERROR(ENOMEM);
282
283 5 avpriv_set_pts_info(c->ast[i], 64, c->sys->time_base.num, c->sys->time_base.den);
284 5 c->ast[i]->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
285 5 c->ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
286 5 c->ast[i]->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
287 5 c->ast[i]->start_time = 0;
288 5 c->ast[i]->codecpar->bit_rate = 2 * sr * 16;
289
290 5 c->ast[i]->codecpar->sample_rate = sr;
291 5 c->audio_pkt[i].last_sample_rate = sr;
292
293 5 c->audio_pkt[i].size = 0;
294 5 c->audio_pkt[i].data = c->audio_buf[i];
295 5 c->audio_pkt[i].stream_index = c->ast[i]->index;
296 5 c->audio_pkt[i].flags |= AV_PKT_FLAG_KEY;
297 5 c->audio_pkt[i].pts = AV_NOPTS_VALUE;
298 5 c->audio_pkt[i].duration = 0;
299 5 c->audio_pkt[i].pos = -1;
300 }
301
302 131 c->audio_pkt[i].sample_rate = sr;
303 }
304 131 c->ach = ach;
305
306 131 return (c->sys->audio_min_samples[freq] + smpls) * 4; /* 2ch, 2bytes */
307 }
308
309 1147 static int dv_extract_video_info(DVDemuxContext *c, const uint8_t *frame)
310 {
311 const uint8_t *vsc_pack;
312 AVCodecParameters *par;
313 int apt, is16_9;
314
315 1147 par = c->vst->codecpar;
316
317 1147 avpriv_set_pts_info(c->vst, 64, c->sys->time_base.num,
318 1147 c->sys->time_base.den);
319 1147 c->vst->avg_frame_rate = av_inv_q(c->vst->time_base);
320
321 /* finding out SAR is a little bit messy */
322 1147 vsc_pack = dv_extract_pack(frame, DV_VIDEO_CONTROL);
323 1147 apt = frame[4] & 0x07;
324
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1460 is16_9 = (vsc_pack && ((vsc_pack[2] & 0x07) == 0x02 ||
325
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313 (!apt && (vsc_pack[2] & 0x07) == 0x07)));
326 1147 c->vst->sample_aspect_ratio = c->sys->sar[is16_9];
327 1147 par->bit_rate = av_rescale_q(c->sys->frame_size,
328 1147 (AVRational) { 8, 1 },
329 1147 c->sys->time_base);
330 1147 return c->sys->frame_size;
331 }
332
333 25 static int dv_extract_timecode(DVDemuxContext* c, const uint8_t* frame, char *tc)
334 {
335 const uint8_t *tc_pack;
336
337 // For PAL systems, drop frame bit is replaced by an arbitrary
338 // bit so its value should not be considered. Drop frame timecode
339 // is only relevant for NTSC systems.
340
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25 int prevent_df = c->sys->ltc_divisor == 25 || c->sys->ltc_divisor == 50;
341
342 25 tc_pack = dv_extract_pack(frame, DV_TIMECODE);
343
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25 if (!tc_pack)
344 return 0;
345 25 av_timecode_make_smpte_tc_string2(tc, av_inv_q(c->sys->time_base), AV_RB32(tc_pack + 1), prevent_df, 1);
346 25 return 1;
347 }
348
349 /* The following 3 functions constitute our interface to the world */
350
351 25 static int dv_init_demux(AVFormatContext *s, DVDemuxContext *c)
352 {
353 25 c->vst = avformat_new_stream(s, NULL);
354
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25 if (!c->vst)
355 return AVERROR(ENOMEM);
356
357 25 c->fctx = s;
358 25 c->vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
359 25 c->vst->codecpar->codec_id = AV_CODEC_ID_DVVIDEO;
360 25 c->vst->codecpar->bit_rate = 25000000;
361 25 c->vst->start_time = 0;
362
363 /* Audio streams are added later as they are encountered. */
364 25 s->ctx_flags |= AVFMTCTX_NOHEADER;
365
366 25 return 0;
367 }
368
369 DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s)
370 {
371 DVDemuxContext *c;
372
373 c = av_mallocz(sizeof(DVDemuxContext));
374 if (!c)
375 return NULL;
376
377 if (dv_init_demux(s, c)) {
378 av_free(c);
379 return NULL;
380 }
381
382 return c;
383 }
384
385 1277 int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
386 {
387 1277 int size = -1;
388 int i;
389
390
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1411 for (i = 0; i < c->ach; i++) {
391
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239 if (c->ast[i] && c->audio_pkt[i].size) {
392 105 DVPacket *dpkt = &c->audio_pkt[i];
393
394 105 pkt->size = dpkt->size;
395 105 pkt->data = dpkt->data;
396 105 pkt->stream_index = dpkt->stream_index;
397 105 pkt->flags = dpkt->flags;
398 105 pkt->pts = dpkt->pts;
399 105 pkt->duration = dpkt->duration;
400 105 pkt->pos = dpkt->pos;
401
402 105 dpkt->size = 0;
403 105 size = pkt->size;
404
405
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105 if (dpkt->last_sample_rate != dpkt->sample_rate) {
406 int ret = ff_add_param_change(pkt, 0, 0, dpkt->sample_rate, 0, 0);
407 if (ret < 0)
408 return ret;
409 dpkt->last_sample_rate = dpkt->sample_rate;
410 }
411
412 105 break;
413 }
414 }
415
416 1277 return size;
417 }
418
419 1147 int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
420 uint8_t *buf, int buf_size, int64_t pos)
421 {
422 int size, i;
423 1147 uint8_t *ppcm[5] = { 0 };
424
425
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1147 if (buf_size < DV_PROFILE_BYTES ||
426
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1147 !(c->sys = av_dv_frame_profile(c->sys, buf, buf_size)) ||
427
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1147 buf_size < c->sys->frame_size) {
428 return AVERROR_INVALIDDATA;
429 }
430
431 /* Queueing audio packet */
432 /* FIXME: in case of no audio/bad audio we have to do something */
433 1147 size = dv_extract_audio_info(c, buf);
434
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1147 if (size < 0)
435 return size;
436
437
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1278 for (i = 0; i < c->ach; i++) {
438 131 c->audio_pkt[i].pos = pos;
439 131 c->audio_pkt[i].size = size;
440
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131 c->audio_pkt[i].pts = (c->sys->height == 720) ? (c->frames & ~1) : c->frames;
441 131 c->audio_pkt[i].duration = 1;
442 131 ppcm[i] = c->audio_buf[i];
443 }
444
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1147 if (c->ach)
445 131 dv_extract_audio(buf, ppcm, c->sys);
446
447 /* We work with 720p frames split in half, thus even frames have
448 * channels 0,1 and odd 2,3. */
449
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1147 if (c->sys->height == 720) {
450
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200 if (buf[1] & 0x0C) {
451 100 c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
452 } else {
453 100 c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
454 }
455 }
456
457 /* return the video packet, if the caller wants it */
458
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1147 if (pkt) {
459 1147 size = dv_extract_video_info(c, buf);
460
461 1147 pkt->data = buf;
462 1147 pkt->pos = pos;
463 1147 pkt->size = size;
464 1147 pkt->flags |= AV_PKT_FLAG_KEY;
465 1147 pkt->stream_index = c->vst->index;
466 1147 pkt->pts = c->frames;
467 }
468
469 1147 c->frames++;
470
471 1147 return size;
472 }
473
474 104 static int64_t dv_frame_offset(AVFormatContext *s, DVDemuxContext *c,
475 int64_t timestamp, int flags)
476 {
477 // FIXME: sys may be wrong if last dv_read_packet() failed (buffer is junk)
478 104 FFFormatContext *const si = ffformatcontext(s);
479 104 const int frame_size = c->sys->frame_size;
480 int64_t offset;
481 104 int64_t size = avio_size(s->pb) - si->data_offset;
482 104 int64_t max_offset = ((size - 1) / frame_size) * frame_size;
483
484 104 offset = frame_size * timestamp;
485
486
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104 if (size >= 0 && offset > max_offset)
487 30 offset = max_offset;
488
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74 else if (offset < 0)
489 32 offset = 0;
490
491 104 return offset + si->data_offset;
492 }
493
494 104 void ff_dv_offset_reset(DVDemuxContext *c, int64_t frame_offset)
495 {
496 104 c->frames = frame_offset;
497 104 c->audio_pkt[0].size = c->audio_pkt[1].size = 0;
498 104 c->audio_pkt[2].size = c->audio_pkt[3].size = 0;
499 104 }
500
501 /************************************************************
502 * Implementation of the easiest DV storage of all -- raw DV.
503 ************************************************************/
504
505 typedef struct RawDVContext {
506 DVDemuxContext dv_demux;
507 uint8_t buf[DV_MAX_FRAME_SIZE];
508 } RawDVContext;
509
510 25 static int dv_read_timecode(AVFormatContext *s) {
511 int ret;
512 char timecode[AV_TIMECODE_STR_SIZE];
513 25 int64_t pos = avio_tell(s->pb);
514
515 // Read 3 DIF blocks: Header block and 2 Subcode blocks.
516 #define PARTIAL_FRAME_SIZE (3 * 80)
517 uint8_t partial_frame[PARTIAL_FRAME_SIZE];
518 25 RawDVContext *c = s->priv_data;
519
520 25 ret = avio_read(s->pb, partial_frame, PARTIAL_FRAME_SIZE);
521
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25 if (ret < 0)
522 goto finish;
523
524
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25 if (ret < PARTIAL_FRAME_SIZE) {
525 ret = -1;
526 goto finish;
527 }
528
529 25 ret = dv_extract_timecode(&c->dv_demux, partial_frame, timecode);
530
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25 if (ret)
531 25 av_dict_set(&s->metadata, "timecode", timecode, 0);
532 else
533 av_log(s, AV_LOG_ERROR, "Detected timecode is invalid\n");
534
535 25 finish:
536 25 avio_seek(s->pb, pos, SEEK_SET);
537 25 return ret;
538 }
539
540 25 static int dv_read_header(AVFormatContext *s)
541 {
542 25 unsigned state, marker_pos = 0;
543 25 RawDVContext *c = s->priv_data;
544 int ret;
545
546
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25 if ((ret = dv_init_demux(s, &c->dv_demux)) < 0)
547 return ret;
548
549 25 state = avio_rb32(s->pb);
550
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25 while ((state & 0xffffff7f) != 0x1f07003f) {
551 if (avio_feof(s->pb)) {
552 av_log(s, AV_LOG_ERROR, "Cannot find DV header.\n");
553 return AVERROR_INVALIDDATA;
554 }
555 if (state == 0x003f0700 || state == 0xff3f0700)
556 marker_pos = avio_tell(s->pb);
557 if (state == 0xff3f0701 && avio_tell(s->pb) - marker_pos == 80) {
558 avio_seek(s->pb, -163, SEEK_CUR);
559 state = avio_rb32(s->pb);
560 break;
561 }
562 state = (state << 8) | avio_r8(s->pb);
563 }
564 25 AV_WB32(c->buf, state);
565
566
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50 if (avio_read(s->pb, c->buf + 4, DV_PROFILE_BYTES - 4) != DV_PROFILE_BYTES - 4 ||
567 25 avio_seek(s->pb, -DV_PROFILE_BYTES, SEEK_CUR) < 0) {
568 return AVERROR(EIO);
569 }
570
571 50 c->dv_demux.sys = av_dv_frame_profile(c->dv_demux.sys,
572 25 c->buf,
573 DV_PROFILE_BYTES);
574
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25 if (!c->dv_demux.sys) {
575 av_log(s, AV_LOG_ERROR,
576 "Can't determine profile of DV input stream.\n");
577 return AVERROR_INVALIDDATA;
578 }
579
580 25 s->bit_rate = av_rescale_q(c->dv_demux.sys->frame_size,
581 25 (AVRational) { 8, 1 },
582 25 c->dv_demux.sys->time_base);
583
584
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25 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
585 25 dv_read_timecode(s);
586
587 25 return 0;
588 }
589
590 1277 static int dv_read_packet(AVFormatContext *s, AVPacket *pkt)
591 {
592 int size;
593 1277 RawDVContext *c = s->priv_data;
594
595 1277 size = avpriv_dv_get_packet(&c->dv_demux, pkt);
596
597
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1277 if (size < 0) {
598 int ret;
599 1172 int64_t pos = avio_tell(s->pb);
600
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1172 if (!c->dv_demux.sys)
601 return AVERROR(EIO);
602 1172 size = c->dv_demux.sys->frame_size;
603 1172 ret = avio_read(s->pb, c->buf, size);
604
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1172 if (ret < 0) {
605 25 return ret;
606
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1147 } else if (ret == 0) {
607 return AVERROR(EIO);
608 }
609
610 1147 size = avpriv_dv_produce_packet(&c->dv_demux, pkt, c->buf, size, pos);
611 }
612
613 1252 return size;
614 }
615
616 104 static int dv_read_seek(AVFormatContext *s, int stream_index,
617 int64_t timestamp, int flags)
618 {
619 104 RawDVContext *r = s->priv_data;
620 104 DVDemuxContext *c = &r->dv_demux;
621 104 int64_t offset = dv_frame_offset(s, c, timestamp, flags);
622
623
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104 if (avio_seek(s->pb, offset, SEEK_SET) < 0)
624 return -1;
625
626 104 ff_dv_offset_reset(c, offset / c->sys->frame_size);
627 104 return 0;
628 }
629
630 6780 static int dv_probe(const AVProbeData *p)
631 {
632 6780 unsigned marker_pos = 0;
633 int i;
634 6780 int matches = 0;
635 6780 int firstmatch = 0;
636 6780 int secondary_matches = 0;
637
638
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6780 if (p->buf_size < 5)
639 return 0;
640
641
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139362773 for (i = 0; i < p->buf_size-4; i++) {
642 139355993 unsigned state = AV_RB32(p->buf+i);
643
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139355993 if ((state & 0x0007f840) == 0x00070000) {
644 // any section header, also with seq/chan num != 0,
645 // should appear around every 12000 bytes, at least 10 per frame
646
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820349 if ((state & 0xff07ff7f) == 0x1f07003f) {
647 29 secondary_matches++;
648
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29 if ((state & 0xffffff7f) == 0x1f07003f) {
649 27 matches++;
650
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27 if (!i)
651 25 firstmatch = 1;
652 }
653 }
654
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820349 if (state == 0x003f0700 || state == 0xff3f0700)
655 33 marker_pos = i;
656
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820349 if (state == 0xff3f0701 && i - marker_pos == 80)
657 27 matches++;
658 }
659 }
660
661
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6780 if (matches && p->buf_size / matches < 1024 * 1024) {
662
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27 if (matches > 4 || firstmatch ||
663 (secondary_matches >= 10 &&
664 p->buf_size / secondary_matches < 24000))
665 // not max to avoid dv in mov to match
666 25 return AVPROBE_SCORE_MAX * 3 / 4;
667 2 return AVPROBE_SCORE_MAX / 4;
668 }
669 6753 return 0;
670 }
671
672 const AVInputFormat ff_dv_demuxer = {
673 .name = "dv",
674 .long_name = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
675 .priv_data_size = sizeof(RawDVContext),
676 .read_probe = dv_probe,
677 .read_header = dv_read_header,
678 .read_packet = dv_read_packet,
679 .read_seek = dv_read_seek,
680 .extensions = "dv,dif",
681 };
682
683 #else // CONFIG_DV_DEMUXER
684 DVDemuxContext *avpriv_dv_init_demux(AVFormatContext *s)
685 {
686 return NULL;
687 }
688
689 int avpriv_dv_get_packet(DVDemuxContext *c, AVPacket *pkt)
690 {
691 return AVERROR(ENOSYS);
692 }
693
694 int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
695 uint8_t *buf, int buf_size, int64_t pos)
696 {
697 return AVERROR(ENOSYS);
698 }
699 #endif // CONFIG_DV_DEMUXER
700