OLD | NEW |
1 // Copyright (c) 2012 The WebM project authors. All Rights Reserved. | 1 // Copyright (c) 2012 The WebM project authors. All Rights Reserved. |
2 // | 2 // |
3 // Use of this source code is governed by a BSD-style license | 3 // Use of this source code is governed by a BSD-style license |
4 // that can be found in the LICENSE file in the root of the source | 4 // that can be found in the LICENSE file in the root of the source |
5 // tree. An additional intellectual property rights grant can be found | 5 // tree. An additional intellectual property rights grant can be found |
6 // in the file PATENTS. All contributing project authors may | 6 // in the file PATENTS. All contributing project authors may |
7 // be found in the AUTHORS file in the root of the source tree. | 7 // be found in the AUTHORS file in the root of the source tree. |
8 | 8 |
9 #include "mkvmuxerutil.hpp" | 9 #include "mkvmuxerutil.hpp" |
10 | 10 |
11 #ifdef __ANDROID__ | 11 #ifdef __ANDROID__ |
12 #include <fcntl.h> | 12 #include <fcntl.h> |
13 #endif | 13 #endif |
14 | 14 |
15 #include <cassert> | 15 #include <cassert> |
16 #include <cmath> | 16 #include <cmath> |
17 #include <cstdio> | 17 #include <cstdio> |
18 #ifdef _MSC_VER | |
19 #define _CRT_RAND_S | |
20 #endif | |
21 #include <cstdlib> | 18 #include <cstdlib> |
22 #include <cstring> | 19 #include <cstring> |
23 #include <ctime> | 20 #include <ctime> |
24 | |
25 #include <new> | 21 #include <new> |
26 | 22 |
27 #include "mkvwriter.hpp" | 23 #include "mkvwriter.hpp" |
28 #include "webmids.hpp" | 24 #include "webmids.hpp" |
29 | 25 |
| 26 #ifdef _MSC_VER |
| 27 // Disable MSVC warnings that suggest making code non-portable. |
| 28 #pragma warning(disable : 4996) |
| 29 #endif |
| 30 |
30 namespace mkvmuxer { | 31 namespace mkvmuxer { |
31 | 32 |
32 namespace { | 33 namespace { |
33 | 34 |
34 // Date elements are always 8 octets in size. | 35 // Date elements are always 8 octets in size. |
35 const int kDateElementSize = 8; | 36 const int kDateElementSize = 8; |
36 | 37 |
| 38 uint64 WriteBlock(IMkvWriter* writer, const Frame* const frame, int64 timecode, |
| 39 uint64 timecode_scale) { |
| 40 uint64 block_additional_elem_size = 0; |
| 41 uint64 block_addid_elem_size = 0; |
| 42 uint64 block_more_payload_size = 0; |
| 43 uint64 block_more_elem_size = 0; |
| 44 uint64 block_additions_payload_size = 0; |
| 45 uint64 block_additions_elem_size = 0; |
| 46 if (frame->additional()) { |
| 47 block_additional_elem_size = EbmlElementSize( |
| 48 kMkvBlockAdditional, frame->additional(), frame->additional_length()); |
| 49 block_addid_elem_size = EbmlElementSize(kMkvBlockAddID, frame->add_id()); |
| 50 |
| 51 block_more_payload_size = |
| 52 block_addid_elem_size + block_additional_elem_size; |
| 53 block_more_elem_size = |
| 54 EbmlMasterElementSize(kMkvBlockMore, block_more_payload_size) + |
| 55 block_more_payload_size; |
| 56 block_additions_payload_size = block_more_elem_size; |
| 57 block_additions_elem_size = |
| 58 EbmlMasterElementSize(kMkvBlockAdditions, |
| 59 block_additions_payload_size) + |
| 60 block_additions_payload_size; |
| 61 } |
| 62 |
| 63 uint64 discard_padding_elem_size = 0; |
| 64 if (frame->discard_padding() != 0) { |
| 65 discard_padding_elem_size = |
| 66 EbmlElementSize(kMkvDiscardPadding, frame->discard_padding()); |
| 67 } |
| 68 |
| 69 const uint64 reference_block_timestamp = |
| 70 frame->reference_block_timestamp() / timecode_scale; |
| 71 uint64 reference_block_elem_size = 0; |
| 72 if (!frame->is_key()) { |
| 73 reference_block_elem_size = |
| 74 EbmlElementSize(kMkvReferenceBlock, reference_block_timestamp); |
| 75 } |
| 76 |
| 77 const uint64 duration = frame->duration() / timecode_scale; |
| 78 uint64 block_duration_elem_size = 0; |
| 79 if (duration > 0) |
| 80 block_duration_elem_size = EbmlElementSize(kMkvBlockDuration, duration); |
| 81 |
| 82 const uint64 block_payload_size = 4 + frame->length(); |
| 83 const uint64 block_elem_size = |
| 84 EbmlMasterElementSize(kMkvBlock, block_payload_size) + block_payload_size; |
| 85 |
| 86 const uint64 block_group_payload_size = |
| 87 block_elem_size + block_additions_elem_size + block_duration_elem_size + |
| 88 discard_padding_elem_size + reference_block_elem_size; |
| 89 |
| 90 if (!WriteEbmlMasterElement(writer, kMkvBlockGroup, |
| 91 block_group_payload_size)) { |
| 92 return 0; |
| 93 } |
| 94 |
| 95 if (!WriteEbmlMasterElement(writer, kMkvBlock, block_payload_size)) |
| 96 return 0; |
| 97 |
| 98 if (WriteUInt(writer, frame->track_number())) |
| 99 return 0; |
| 100 |
| 101 if (SerializeInt(writer, timecode, 2)) |
| 102 return 0; |
| 103 |
| 104 // For a Block, flags is always 0. |
| 105 if (SerializeInt(writer, 0, 1)) |
| 106 return 0; |
| 107 |
| 108 if (writer->Write(frame->frame(), static_cast<uint32>(frame->length()))) |
| 109 return 0; |
| 110 |
| 111 if (frame->additional()) { |
| 112 if (!WriteEbmlMasterElement(writer, kMkvBlockAdditions, |
| 113 block_additions_payload_size)) { |
| 114 return 0; |
| 115 } |
| 116 |
| 117 if (!WriteEbmlMasterElement(writer, kMkvBlockMore, block_more_payload_size)) |
| 118 return 0; |
| 119 |
| 120 if (!WriteEbmlElement(writer, kMkvBlockAddID, frame->add_id())) |
| 121 return 0; |
| 122 |
| 123 if (!WriteEbmlElement(writer, kMkvBlockAdditional, frame->additional(), |
| 124 frame->additional_length())) { |
| 125 return 0; |
| 126 } |
| 127 } |
| 128 |
| 129 if (frame->discard_padding() != 0 && |
| 130 !WriteEbmlElement(writer, kMkvDiscardPadding, frame->discard_padding())) { |
| 131 return false; |
| 132 } |
| 133 |
| 134 if (!frame->is_key() && |
| 135 !WriteEbmlElement(writer, kMkvReferenceBlock, |
| 136 reference_block_timestamp)) { |
| 137 return false; |
| 138 } |
| 139 |
| 140 if (duration > 0 && !WriteEbmlElement(writer, kMkvBlockDuration, duration)) { |
| 141 return false; |
| 142 } |
| 143 return EbmlMasterElementSize(kMkvBlockGroup, block_group_payload_size) + |
| 144 block_group_payload_size; |
| 145 } |
| 146 |
| 147 uint64 WriteSimpleBlock(IMkvWriter* writer, const Frame* const frame, |
| 148 int64 timecode) { |
| 149 if (WriteID(writer, kMkvSimpleBlock)) |
| 150 return 0; |
| 151 |
| 152 const int32 size = static_cast<int32>(frame->length()) + 4; |
| 153 if (WriteUInt(writer, size)) |
| 154 return 0; |
| 155 |
| 156 if (WriteUInt(writer, static_cast<uint64>(frame->track_number()))) |
| 157 return 0; |
| 158 |
| 159 if (SerializeInt(writer, timecode, 2)) |
| 160 return 0; |
| 161 |
| 162 uint64 flags = 0; |
| 163 if (frame->is_key()) |
| 164 flags |= 0x80; |
| 165 |
| 166 if (SerializeInt(writer, flags, 1)) |
| 167 return 0; |
| 168 |
| 169 if (writer->Write(frame->frame(), static_cast<uint32>(frame->length()))) |
| 170 return 0; |
| 171 |
| 172 return GetUIntSize(kMkvSimpleBlock) + GetCodedUIntSize(size) + 4 + |
| 173 frame->length(); |
| 174 } |
| 175 |
37 } // namespace | 176 } // namespace |
38 | 177 |
39 int32 GetCodedUIntSize(uint64 value) { | 178 int32 GetCodedUIntSize(uint64 value) { |
40 if (value < 0x000000000000007FULL) | 179 if (value < 0x000000000000007FULL) |
41 return 1; | 180 return 1; |
42 else if (value < 0x0000000000003FFFULL) | 181 else if (value < 0x0000000000003FFFULL) |
43 return 2; | 182 return 2; |
44 else if (value < 0x00000000001FFFFFULL) | 183 else if (value < 0x00000000001FFFFFULL) |
45 return 3; | 184 return 3; |
46 else if (value < 0x000000000FFFFFFFULL) | 185 else if (value < 0x000000000FFFFFFFULL) |
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65 return 4; | 204 return 4; |
66 else if (value < 0x0000010000000000ULL) | 205 else if (value < 0x0000010000000000ULL) |
67 return 5; | 206 return 5; |
68 else if (value < 0x0001000000000000ULL) | 207 else if (value < 0x0001000000000000ULL) |
69 return 6; | 208 return 6; |
70 else if (value < 0x0100000000000000ULL) | 209 else if (value < 0x0100000000000000ULL) |
71 return 7; | 210 return 7; |
72 return 8; | 211 return 8; |
73 } | 212 } |
74 | 213 |
| 214 int32 GetIntSize(int64 value) { |
| 215 // Doubling the requested value ensures positive values with their high bit |
| 216 // set are written with 0-padding to avoid flipping the signedness. |
| 217 const uint64 v = (value < 0) ? value ^ -1LL : value; |
| 218 return GetUIntSize(2 * v); |
| 219 } |
| 220 |
75 uint64 EbmlMasterElementSize(uint64 type, uint64 value) { | 221 uint64 EbmlMasterElementSize(uint64 type, uint64 value) { |
76 // Size of EBML ID | 222 // Size of EBML ID |
77 int32 ebml_size = GetUIntSize(type); | 223 int32 ebml_size = GetUIntSize(type); |
78 | 224 |
79 // Datasize | 225 // Datasize |
80 ebml_size += GetCodedUIntSize(value); | 226 ebml_size += GetCodedUIntSize(value); |
81 | 227 |
82 return ebml_size; | 228 return ebml_size; |
83 } | 229 } |
84 | 230 |
85 uint64 EbmlElementSize(uint64 type, int64 value) { | 231 uint64 EbmlElementSize(uint64 type, int64 value) { |
86 return EbmlElementSize(type, static_cast<uint64>(value)); | 232 // Size of EBML ID |
| 233 int32 ebml_size = GetUIntSize(type); |
| 234 |
| 235 // Datasize |
| 236 ebml_size += GetIntSize(value); |
| 237 |
| 238 // Size of Datasize |
| 239 ebml_size++; |
| 240 |
| 241 return ebml_size; |
87 } | 242 } |
88 | 243 |
89 uint64 EbmlElementSize(uint64 type, uint64 value) { | 244 uint64 EbmlElementSize(uint64 type, uint64 value) { |
90 // Size of EBML ID | 245 // Size of EBML ID |
91 int32 ebml_size = GetUIntSize(type); | 246 int32 ebml_size = GetUIntSize(type); |
92 | 247 |
93 // Datasize | 248 // Datasize |
94 ebml_size += GetUIntSize(value); | 249 ebml_size += GetUIntSize(value); |
95 | 250 |
96 // Size of Datasize | 251 // Size of Datasize |
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137 | 292 |
138 // Datasize | 293 // Datasize |
139 ebml_size += size; | 294 ebml_size += size; |
140 | 295 |
141 // Size of Datasize | 296 // Size of Datasize |
142 ebml_size += GetCodedUIntSize(size); | 297 ebml_size += GetCodedUIntSize(size); |
143 | 298 |
144 return ebml_size; | 299 return ebml_size; |
145 } | 300 } |
146 | 301 |
147 uint64 EbmlDateElementSize(uint64 type, int64 value) { | 302 uint64 EbmlDateElementSize(uint64 type) { |
148 // Size of EBML ID | 303 // Size of EBML ID |
149 uint64 ebml_size = GetUIntSize(type); | 304 uint64 ebml_size = GetUIntSize(type); |
150 | 305 |
151 // Datasize | 306 // Datasize |
152 ebml_size += kDateElementSize; | 307 ebml_size += kDateElementSize; |
153 | 308 |
154 // Size of Datasize | 309 // Size of Datasize |
155 ebml_size++; | 310 ebml_size++; |
156 | 311 |
157 return ebml_size; | 312 return ebml_size; |
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282 const uint64 size = GetUIntSize(value); | 437 const uint64 size = GetUIntSize(value); |
283 if (WriteUInt(writer, size)) | 438 if (WriteUInt(writer, size)) |
284 return false; | 439 return false; |
285 | 440 |
286 if (SerializeInt(writer, value, static_cast<int32>(size))) | 441 if (SerializeInt(writer, value, static_cast<int32>(size))) |
287 return false; | 442 return false; |
288 | 443 |
289 return true; | 444 return true; |
290 } | 445 } |
291 | 446 |
| 447 bool WriteEbmlElement(IMkvWriter* writer, uint64 type, int64 value) { |
| 448 if (!writer) |
| 449 return false; |
| 450 |
| 451 if (WriteID(writer, type)) |
| 452 return 0; |
| 453 |
| 454 const uint64 size = GetIntSize(value); |
| 455 if (WriteUInt(writer, size)) |
| 456 return false; |
| 457 |
| 458 if (SerializeInt(writer, value, static_cast<int32>(size))) |
| 459 return false; |
| 460 |
| 461 return true; |
| 462 } |
| 463 |
292 bool WriteEbmlElement(IMkvWriter* writer, uint64 type, float value) { | 464 bool WriteEbmlElement(IMkvWriter* writer, uint64 type, float value) { |
293 if (!writer) | 465 if (!writer) |
294 return false; | 466 return false; |
295 | 467 |
296 if (WriteID(writer, type)) | 468 if (WriteID(writer, type)) |
297 return false; | 469 return false; |
298 | 470 |
299 if (WriteUInt(writer, 4)) | 471 if (WriteUInt(writer, 4)) |
300 return false; | 472 return false; |
301 | 473 |
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348 | 520 |
349 if (WriteUInt(writer, kDateElementSize)) | 521 if (WriteUInt(writer, kDateElementSize)) |
350 return false; | 522 return false; |
351 | 523 |
352 if (SerializeInt(writer, value, kDateElementSize)) | 524 if (SerializeInt(writer, value, kDateElementSize)) |
353 return false; | 525 return false; |
354 | 526 |
355 return true; | 527 return true; |
356 } | 528 } |
357 | 529 |
358 uint64 WriteSimpleBlock(IMkvWriter* writer, const uint8* data, uint64 length, | 530 uint64 WriteFrame(IMkvWriter* writer, const Frame* const frame, |
359 uint64 track_number, int64 timecode, uint64 is_key) { | 531 Cluster* cluster) { |
360 if (!writer) | 532 if (!writer || !frame || !frame->IsValid() || !cluster || |
361 return false; | 533 !cluster->timecode_scale()) |
362 | |
363 if (!data || length < 1) | |
364 return false; | |
365 | |
366 // Here we only permit track number values to be no greater than | |
367 // 126, which the largest value we can store having a Matroska | |
368 // integer representation of only 1 byte. | |
369 | |
370 if (track_number < 1 || track_number > 126) | |
371 return false; | |
372 | |
373 // Technically the timestamp for a block can be less than the | |
374 // timestamp for the cluster itself (remember that block timestamp | |
375 // is a signed, 16-bit integer). However, as a simplification we | |
376 // only permit non-negative cluster-relative timestamps for blocks. | |
377 | |
378 if (timecode < 0 || timecode > kMaxBlockTimecode) | |
379 return false; | |
380 | |
381 if (WriteID(writer, kMkvSimpleBlock)) | |
382 return 0; | 534 return 0; |
383 | 535 |
384 const int32 size = static_cast<int32>(length) + 4; | 536 // Technically the timecode for a block can be less than the |
385 if (WriteUInt(writer, size)) | 537 // timecode for the cluster itself (remember that block timecode |
| 538 // is a signed, 16-bit integer). However, as a simplification we |
| 539 // only permit non-negative cluster-relative timecodes for blocks. |
| 540 const int64 relative_timecode = cluster->GetRelativeTimecode( |
| 541 frame->timestamp() / cluster->timecode_scale()); |
| 542 if (relative_timecode < 0 || relative_timecode > kMaxBlockTimecode) |
386 return 0; | 543 return 0; |
387 | 544 |
388 if (WriteUInt(writer, static_cast<uint64>(track_number))) | 545 return frame->CanBeSimpleBlock() ? |
389 return 0; | 546 WriteSimpleBlock(writer, frame, relative_timecode) : |
390 | 547 WriteBlock(writer, frame, relative_timecode, |
391 if (SerializeInt(writer, timecode, 2)) | 548 cluster->timecode_scale()); |
392 return 0; | |
393 | |
394 uint64 flags = 0; | |
395 if (is_key) | |
396 flags |= 0x80; | |
397 | |
398 if (SerializeInt(writer, flags, 1)) | |
399 return 0; | |
400 | |
401 if (writer->Write(data, static_cast<uint32>(length))) | |
402 return 0; | |
403 | |
404 const uint64 element_size = | |
405 GetUIntSize(kMkvSimpleBlock) + GetCodedUIntSize(size) + 4 + length; | |
406 | |
407 return element_size; | |
408 } | |
409 | |
410 // We must write the metadata (key)frame as a BlockGroup element, | |
411 // because we need to specify a duration for the frame. The | |
412 // BlockGroup element comprises the frame itself and its duration, | |
413 // and is laid out as follows: | |
414 // | |
415 // BlockGroup tag | |
416 // BlockGroup size | |
417 // Block tag | |
418 // Block size | |
419 // (the frame is the block payload) | |
420 // Duration tag | |
421 // Duration size | |
422 // (duration payload) | |
423 // | |
424 uint64 WriteMetadataBlock(IMkvWriter* writer, const uint8* data, uint64 length, | |
425 uint64 track_number, int64 timecode, | |
426 uint64 duration) { | |
427 // We don't backtrack when writing to the stream, so we must | |
428 // pre-compute the BlockGroup size, by summing the sizes of each | |
429 // sub-element (the block and the duration). | |
430 | |
431 // We use a single byte for the track number of the block, which | |
432 // means the block header is exactly 4 bytes. | |
433 | |
434 // TODO(matthewjheaney): use EbmlMasterElementSize and WriteEbmlMasterElement | |
435 | |
436 const uint64 block_payload_size = 4 + length; | |
437 const int32 block_size = GetCodedUIntSize(block_payload_size); | |
438 const uint64 block_elem_size = 1 + block_size + block_payload_size; | |
439 | |
440 const int32 duration_payload_size = GetUIntSize(duration); | |
441 const int32 duration_size = GetCodedUIntSize(duration_payload_size); | |
442 const uint64 duration_elem_size = 1 + duration_size + duration_payload_size; | |
443 | |
444 const uint64 blockg_payload_size = block_elem_size + duration_elem_size; | |
445 const int32 blockg_size = GetCodedUIntSize(blockg_payload_size); | |
446 const uint64 blockg_elem_size = 1 + blockg_size + blockg_payload_size; | |
447 | |
448 if (WriteID(writer, kMkvBlockGroup)) // 1-byte ID size | |
449 return 0; | |
450 | |
451 if (WriteUInt(writer, blockg_payload_size)) | |
452 return 0; | |
453 | |
454 // Write Block element | |
455 | |
456 if (WriteID(writer, kMkvBlock)) // 1-byte ID size | |
457 return 0; | |
458 | |
459 if (WriteUInt(writer, block_payload_size)) | |
460 return 0; | |
461 | |
462 // Byte 1 of 4 | |
463 | |
464 if (WriteUInt(writer, track_number)) | |
465 return 0; | |
466 | |
467 // Bytes 2 & 3 of 4 | |
468 | |
469 if (SerializeInt(writer, timecode, 2)) | |
470 return 0; | |
471 | |
472 // Byte 4 of 4 | |
473 | |
474 const uint64 flags = 0; | |
475 | |
476 if (SerializeInt(writer, flags, 1)) | |
477 return 0; | |
478 | |
479 // Now write the actual frame (of metadata) | |
480 | |
481 if (writer->Write(data, static_cast<uint32>(length))) | |
482 return 0; | |
483 | |
484 // Write Duration element | |
485 | |
486 if (WriteID(writer, kMkvBlockDuration)) // 1-byte ID size | |
487 return 0; | |
488 | |
489 if (WriteUInt(writer, duration_payload_size)) | |
490 return 0; | |
491 | |
492 if (SerializeInt(writer, duration, duration_payload_size)) | |
493 return 0; | |
494 | |
495 // Note that we don't write a reference time as part of the block | |
496 // group; no reference time(s) indicates that this block is a | |
497 // keyframe. (Unlike the case for a SimpleBlock element, the header | |
498 // bits of the Block sub-element of a BlockGroup element do not | |
499 // indicate keyframe status. The keyframe status is inferred from | |
500 // the absence of reference time sub-elements.) | |
501 | |
502 return blockg_elem_size; | |
503 } | |
504 | |
505 // Writes a WebM BlockGroup with BlockAdditional data. The structure is as | |
506 // follows: | |
507 // Indentation shows sub-levels | |
508 // BlockGroup | |
509 // Block | |
510 // Data | |
511 // BlockAdditions | |
512 // BlockMore | |
513 // BlockAddID | |
514 // 1 (Denotes Alpha) | |
515 // BlockAdditional | |
516 // Data | |
517 uint64 WriteBlockWithAdditional(IMkvWriter* writer, const uint8* data, | |
518 uint64 length, const uint8* additional, | |
519 uint64 additional_length, uint64 add_id, | |
520 uint64 track_number, int64 timecode, | |
521 uint64 is_key) { | |
522 if (!data || !additional || length < 1 || additional_length < 1) | |
523 return 0; | |
524 | |
525 const uint64 block_payload_size = 4 + length; | |
526 const uint64 block_elem_size = | |
527 EbmlMasterElementSize(kMkvBlock, block_payload_size) + block_payload_size; | |
528 const uint64 block_additional_elem_size = | |
529 EbmlElementSize(kMkvBlockAdditional, additional, additional_length); | |
530 const uint64 block_addid_elem_size = EbmlElementSize(kMkvBlockAddID, add_id); | |
531 | |
532 const uint64 block_more_payload_size = | |
533 block_addid_elem_size + block_additional_elem_size; | |
534 const uint64 block_more_elem_size = | |
535 EbmlMasterElementSize(kMkvBlockMore, block_more_payload_size) + | |
536 block_more_payload_size; | |
537 const uint64 block_additions_payload_size = block_more_elem_size; | |
538 const uint64 block_additions_elem_size = | |
539 EbmlMasterElementSize(kMkvBlockAdditions, block_additions_payload_size) + | |
540 block_additions_payload_size; | |
541 const uint64 block_group_payload_size = | |
542 block_elem_size + block_additions_elem_size; | |
543 const uint64 block_group_elem_size = | |
544 EbmlMasterElementSize(kMkvBlockGroup, block_group_payload_size) + | |
545 block_group_payload_size; | |
546 | |
547 if (!WriteEbmlMasterElement(writer, kMkvBlockGroup, block_group_payload_size)) | |
548 return 0; | |
549 | |
550 if (!WriteEbmlMasterElement(writer, kMkvBlock, block_payload_size)) | |
551 return 0; | |
552 | |
553 if (WriteUInt(writer, track_number)) | |
554 return 0; | |
555 | |
556 if (SerializeInt(writer, timecode, 2)) | |
557 return 0; | |
558 | |
559 uint64 flags = 0; | |
560 if (is_key) | |
561 flags |= 0x80; | |
562 if (SerializeInt(writer, flags, 1)) | |
563 return 0; | |
564 | |
565 if (writer->Write(data, static_cast<uint32>(length))) | |
566 return 0; | |
567 | |
568 if (!WriteEbmlMasterElement(writer, kMkvBlockAdditions, | |
569 block_additions_payload_size)) | |
570 return 0; | |
571 | |
572 if (!WriteEbmlMasterElement(writer, kMkvBlockMore, block_more_payload_size)) | |
573 return 0; | |
574 | |
575 if (!WriteEbmlElement(writer, kMkvBlockAddID, add_id)) | |
576 return 0; | |
577 | |
578 if (!WriteEbmlElement(writer, kMkvBlockAdditional, additional, | |
579 additional_length)) | |
580 return 0; | |
581 | |
582 return block_group_elem_size; | |
583 } | |
584 | |
585 // Writes a WebM BlockGroup with DiscardPadding. The structure is as follows: | |
586 // Indentation shows sub-levels | |
587 // BlockGroup | |
588 // Block | |
589 // Data | |
590 // DiscardPadding | |
591 uint64 WriteBlockWithDiscardPadding(IMkvWriter* writer, const uint8* data, | |
592 uint64 length, int64 discard_padding, | |
593 uint64 track_number, int64 timecode, | |
594 uint64 is_key) { | |
595 if (!data || length < 1 || discard_padding <= 0) | |
596 return 0; | |
597 | |
598 const uint64 block_payload_size = 4 + length; | |
599 const uint64 block_elem_size = | |
600 EbmlMasterElementSize(kMkvBlock, block_payload_size) + block_payload_size; | |
601 const uint64 discard_padding_elem_size = | |
602 EbmlElementSize(kMkvDiscardPadding, discard_padding); | |
603 const uint64 block_group_payload_size = | |
604 block_elem_size + discard_padding_elem_size; | |
605 const uint64 block_group_elem_size = | |
606 EbmlMasterElementSize(kMkvBlockGroup, block_group_payload_size) + | |
607 block_group_payload_size; | |
608 | |
609 if (!WriteEbmlMasterElement(writer, kMkvBlockGroup, block_group_payload_size)) | |
610 return 0; | |
611 | |
612 if (!WriteEbmlMasterElement(writer, kMkvBlock, block_payload_size)) | |
613 return 0; | |
614 | |
615 if (WriteUInt(writer, track_number)) | |
616 return 0; | |
617 | |
618 if (SerializeInt(writer, timecode, 2)) | |
619 return 0; | |
620 | |
621 uint64 flags = 0; | |
622 if (is_key) | |
623 flags |= 0x80; | |
624 if (SerializeInt(writer, flags, 1)) | |
625 return 0; | |
626 | |
627 if (writer->Write(data, static_cast<uint32>(length))) | |
628 return 0; | |
629 | |
630 if (WriteID(writer, kMkvDiscardPadding)) | |
631 return 0; | |
632 | |
633 const uint64 size = GetUIntSize(discard_padding); | |
634 if (WriteUInt(writer, size)) | |
635 return false; | |
636 | |
637 if (SerializeInt(writer, discard_padding, static_cast<int32>(size))) | |
638 return false; | |
639 | |
640 return block_group_elem_size; | |
641 } | 549 } |
642 | 550 |
643 uint64 WriteVoidElement(IMkvWriter* writer, uint64 size) { | 551 uint64 WriteVoidElement(IMkvWriter* writer, uint64 size) { |
644 if (!writer) | 552 if (!writer) |
645 return false; | 553 return false; |
646 | 554 |
647 // Subtract one for the void ID and the coded size. | 555 // Subtract one for the void ID and the coded size. |
648 uint64 void_entry_size = size - 1 - GetCodedUIntSize(size - 1); | 556 uint64 void_entry_size = size - 1 - GetCodedUIntSize(size - 1); |
649 uint64 void_size = | 557 uint64 void_size = |
650 EbmlMasterElementSize(kMkvVoid, void_entry_size) + void_entry_size; | 558 EbmlMasterElementSize(kMkvVoid, void_entry_size) + void_entry_size; |
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691 #ifdef __MINGW32__ | 599 #ifdef __MINGW32__ |
692 srand(*seed); | 600 srand(*seed); |
693 #endif | 601 #endif |
694 | 602 |
695 for (int i = 0; i < 7; ++i) { // avoid problems with 8-byte values | 603 for (int i = 0; i < 7; ++i) { // avoid problems with 8-byte values |
696 uid <<= 8; | 604 uid <<= 8; |
697 | 605 |
698 // TODO(fgalligan): Move random number generation to platform specific code. | 606 // TODO(fgalligan): Move random number generation to platform specific code. |
699 #ifdef _MSC_VER | 607 #ifdef _MSC_VER |
700 (void)seed; | 608 (void)seed; |
701 unsigned int random_value; | 609 const int32 nn = rand(); |
702 const errno_t e = rand_s(&random_value); | |
703 (void)e; | |
704 const int32 nn = random_value; | |
705 #elif __ANDROID__ | 610 #elif __ANDROID__ |
706 int32 temp_num = 1; | 611 int32 temp_num = 1; |
707 int fd = open("/dev/urandom", O_RDONLY); | 612 int fd = open("/dev/urandom", O_RDONLY); |
708 if (fd != -1) { | 613 if (fd != -1) { |
709 read(fd, &temp_num, sizeof(int32)); | 614 read(fd, &temp_num, sizeof(int32)); |
710 close(fd); | 615 close(fd); |
711 } | 616 } |
712 const int32 nn = temp_num; | 617 const int32 nn = temp_num; |
713 #elif defined __MINGW32__ | 618 #elif defined __MINGW32__ |
714 const int32 nn = rand(); | 619 const int32 nn = rand(); |
715 #else | 620 #else |
716 const int32 nn = rand_r(seed); | 621 const int32 nn = rand_r(seed); |
717 #endif | 622 #endif |
718 const int32 n = 0xFF & (nn >> 4); // throw away low-order bits | 623 const int32 n = 0xFF & (nn >> 4); // throw away low-order bits |
719 | 624 |
720 uid |= n; | 625 uid |= n; |
721 } | 626 } |
722 | 627 |
723 return uid; | 628 return uid; |
724 } | 629 } |
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