MPEG2TSWriter.cpp revision d4e5af6bc0a012e8d43975ca8b5627631333920d
1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17//#define LOG_NDEBUG 0 18#define LOG_TAG "MPEG2TSWriter" 19#include <media/stagefright/foundation/ADebug.h> 20 21#include <media/stagefright/foundation/hexdump.h> 22#include <media/stagefright/foundation/ABuffer.h> 23#include <media/stagefright/foundation/AMessage.h> 24#include <media/stagefright/MPEG2TSWriter.h> 25#include <media/stagefright/MediaBuffer.h> 26#include <media/stagefright/MediaDefs.h> 27#include <media/stagefright/MediaErrors.h> 28#include <media/stagefright/MediaSource.h> 29#include <media/stagefright/MetaData.h> 30#include <media/stagefright/Utils.h> 31 32#include "include/ESDS.h" 33 34namespace android { 35 36struct MPEG2TSWriter::SourceInfo : public AHandler { 37 SourceInfo(const sp<MediaSource> &source); 38 39 void start(const sp<AMessage> ¬ify); 40 void stop(); 41 42 unsigned streamType() const; 43 unsigned incrementContinuityCounter(); 44 45 void readMore(); 46 47 enum { 48 kNotifyStartFailed, 49 kNotifyBuffer, 50 kNotifyReachedEOS, 51 }; 52 53 sp<ABuffer> lastAccessUnit(); 54 int64_t lastAccessUnitTimeUs(); 55 void setLastAccessUnit(const sp<ABuffer> &accessUnit); 56 57 void setEOSReceived(); 58 bool eosReceived() const; 59 60protected: 61 virtual void onMessageReceived(const sp<AMessage> &msg); 62 63 virtual ~SourceInfo(); 64 65private: 66 enum { 67 kWhatStart = 'strt', 68 kWhatRead = 'read', 69 }; 70 71 sp<MediaSource> mSource; 72 sp<ALooper> mLooper; 73 sp<AMessage> mNotify; 74 75 sp<ABuffer> mAACCodecSpecificData; 76 77 sp<ABuffer> mAACBuffer; 78 79 sp<ABuffer> mLastAccessUnit; 80 bool mEOSReceived; 81 82 unsigned mStreamType; 83 unsigned mContinuityCounter; 84 85 void extractCodecSpecificData(); 86 87 bool appendAACFrames(MediaBuffer *buffer); 88 bool flushAACFrames(); 89 90 void postAVCFrame(MediaBuffer *buffer); 91 92 DISALLOW_EVIL_CONSTRUCTORS(SourceInfo); 93}; 94 95MPEG2TSWriter::SourceInfo::SourceInfo(const sp<MediaSource> &source) 96 : mSource(source), 97 mLooper(new ALooper), 98 mEOSReceived(false), 99 mStreamType(0), 100 mContinuityCounter(0) { 101 mLooper->setName("MPEG2TSWriter source"); 102 103 sp<MetaData> meta = mSource->getFormat(); 104 const char *mime; 105 CHECK(meta->findCString(kKeyMIMEType, &mime)); 106 107 if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC)) { 108 mStreamType = 0x0f; 109 } else if (!strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC)) { 110 mStreamType = 0x1b; 111 } else { 112 TRESPASS(); 113 } 114} 115 116MPEG2TSWriter::SourceInfo::~SourceInfo() { 117} 118 119unsigned MPEG2TSWriter::SourceInfo::streamType() const { 120 return mStreamType; 121} 122 123unsigned MPEG2TSWriter::SourceInfo::incrementContinuityCounter() { 124 if (++mContinuityCounter == 16) { 125 mContinuityCounter = 0; 126 } 127 128 return mContinuityCounter; 129} 130 131void MPEG2TSWriter::SourceInfo::start(const sp<AMessage> ¬ify) { 132 mLooper->registerHandler(this); 133 mLooper->start(); 134 135 mNotify = notify; 136 137 (new AMessage(kWhatStart, id()))->post(); 138} 139 140void MPEG2TSWriter::SourceInfo::stop() { 141 mLooper->unregisterHandler(id()); 142 mLooper->stop(); 143 144 mSource->stop(); 145} 146 147void MPEG2TSWriter::SourceInfo::extractCodecSpecificData() { 148 sp<MetaData> meta = mSource->getFormat(); 149 150 const char *mime; 151 CHECK(meta->findCString(kKeyMIMEType, &mime)); 152 153 if (!strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC)) { 154 uint32_t type; 155 const void *data; 156 size_t size; 157 if (!meta->findData(kKeyESDS, &type, &data, &size)) { 158 // Codec specific data better be in the first data buffer. 159 return; 160 } 161 162 ESDS esds((const char *)data, size); 163 CHECK_EQ(esds.InitCheck(), (status_t)OK); 164 165 const uint8_t *codec_specific_data; 166 size_t codec_specific_data_size; 167 esds.getCodecSpecificInfo( 168 (const void **)&codec_specific_data, &codec_specific_data_size); 169 170 CHECK_GE(codec_specific_data_size, 2u); 171 172 mAACCodecSpecificData = new ABuffer(codec_specific_data_size); 173 174 memcpy(mAACCodecSpecificData->data(), codec_specific_data, 175 codec_specific_data_size); 176 177 return; 178 } 179 180 if (strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC)) { 181 return; 182 } 183 184 uint32_t type; 185 const void *data; 186 size_t size; 187 if (!meta->findData(kKeyAVCC, &type, &data, &size)) { 188 // Codec specific data better be part of the data stream then. 189 return; 190 } 191 192 sp<ABuffer> out = new ABuffer(1024); 193 out->setRange(0, 0); 194 195 const uint8_t *ptr = (const uint8_t *)data; 196 197 size_t numSeqParameterSets = ptr[5] & 31; 198 199 ptr += 6; 200 size -= 6; 201 202 for (size_t i = 0; i < numSeqParameterSets; ++i) { 203 CHECK(size >= 2); 204 size_t length = U16_AT(ptr); 205 206 ptr += 2; 207 size -= 2; 208 209 CHECK(size >= length); 210 211 CHECK_LE(out->size() + 4 + length, out->capacity()); 212 memcpy(out->data() + out->size(), "\x00\x00\x00\x01", 4); 213 memcpy(out->data() + out->size() + 4, ptr, length); 214 out->setRange(0, out->size() + length + 4); 215 216 ptr += length; 217 size -= length; 218 } 219 220 CHECK(size >= 1); 221 size_t numPictureParameterSets = *ptr; 222 ++ptr; 223 --size; 224 225 for (size_t i = 0; i < numPictureParameterSets; ++i) { 226 CHECK(size >= 2); 227 size_t length = U16_AT(ptr); 228 229 ptr += 2; 230 size -= 2; 231 232 CHECK(size >= length); 233 234 CHECK_LE(out->size() + 4 + length, out->capacity()); 235 memcpy(out->data() + out->size(), "\x00\x00\x00\x01", 4); 236 memcpy(out->data() + out->size() + 4, ptr, length); 237 out->setRange(0, out->size() + length + 4); 238 239 ptr += length; 240 size -= length; 241 } 242 243 out->meta()->setInt64("timeUs", 0ll); 244 245 sp<AMessage> notify = mNotify->dup(); 246 notify->setInt32("what", kNotifyBuffer); 247 notify->setBuffer("buffer", out); 248 notify->setInt32("oob", true); 249 notify->post(); 250} 251 252void MPEG2TSWriter::SourceInfo::postAVCFrame(MediaBuffer *buffer) { 253 sp<AMessage> notify = mNotify->dup(); 254 notify->setInt32("what", kNotifyBuffer); 255 256 sp<ABuffer> copy = 257 new ABuffer(buffer->range_length()); 258 memcpy(copy->data(), 259 (const uint8_t *)buffer->data() 260 + buffer->range_offset(), 261 buffer->range_length()); 262 263 int64_t timeUs; 264 CHECK(buffer->meta_data()->findInt64(kKeyTime, &timeUs)); 265 copy->meta()->setInt64("timeUs", timeUs); 266 267 int32_t isSync; 268 if (buffer->meta_data()->findInt32(kKeyIsSyncFrame, &isSync) 269 && isSync != 0) { 270 copy->meta()->setInt32("isSync", true); 271 } 272 273 notify->setBuffer("buffer", copy); 274 notify->post(); 275} 276 277bool MPEG2TSWriter::SourceInfo::appendAACFrames(MediaBuffer *buffer) { 278 bool accessUnitPosted = false; 279 280 if (mAACBuffer != NULL 281 && mAACBuffer->size() + 7 + buffer->range_length() 282 > mAACBuffer->capacity()) { 283 accessUnitPosted = flushAACFrames(); 284 } 285 286 if (mAACBuffer == NULL) { 287 size_t alloc = 4096; 288 if (buffer->range_length() + 7 > alloc) { 289 alloc = 7 + buffer->range_length(); 290 } 291 292 mAACBuffer = new ABuffer(alloc); 293 294 int64_t timeUs; 295 CHECK(buffer->meta_data()->findInt64(kKeyTime, &timeUs)); 296 297 mAACBuffer->meta()->setInt64("timeUs", timeUs); 298 mAACBuffer->meta()->setInt32("isSync", true); 299 300 mAACBuffer->setRange(0, 0); 301 } 302 303 const uint8_t *codec_specific_data = mAACCodecSpecificData->data(); 304 305 unsigned profile = (codec_specific_data[0] >> 3) - 1; 306 307 unsigned sampling_freq_index = 308 ((codec_specific_data[0] & 7) << 1) 309 | (codec_specific_data[1] >> 7); 310 311 unsigned channel_configuration = 312 (codec_specific_data[1] >> 3) & 0x0f; 313 314 uint8_t *ptr = mAACBuffer->data() + mAACBuffer->size(); 315 316 const uint32_t aac_frame_length = buffer->range_length() + 7; 317 318 *ptr++ = 0xff; 319 *ptr++ = 0xf1; // b11110001, ID=0, layer=0, protection_absent=1 320 321 *ptr++ = 322 profile << 6 323 | sampling_freq_index << 2 324 | ((channel_configuration >> 2) & 1); // private_bit=0 325 326 // original_copy=0, home=0, copyright_id_bit=0, copyright_id_start=0 327 *ptr++ = 328 (channel_configuration & 3) << 6 329 | aac_frame_length >> 11; 330 *ptr++ = (aac_frame_length >> 3) & 0xff; 331 *ptr++ = (aac_frame_length & 7) << 5; 332 333 // adts_buffer_fullness=0, number_of_raw_data_blocks_in_frame=0 334 *ptr++ = 0; 335 336 memcpy(ptr, 337 (const uint8_t *)buffer->data() + buffer->range_offset(), 338 buffer->range_length()); 339 340 ptr += buffer->range_length(); 341 342 mAACBuffer->setRange(0, ptr - mAACBuffer->data()); 343 344 return accessUnitPosted; 345} 346 347bool MPEG2TSWriter::SourceInfo::flushAACFrames() { 348 if (mAACBuffer == NULL) { 349 return false; 350 } 351 352 sp<AMessage> notify = mNotify->dup(); 353 notify->setInt32("what", kNotifyBuffer); 354 notify->setBuffer("buffer", mAACBuffer); 355 notify->post(); 356 357 mAACBuffer.clear(); 358 359 return true; 360} 361 362void MPEG2TSWriter::SourceInfo::readMore() { 363 (new AMessage(kWhatRead, id()))->post(); 364} 365 366void MPEG2TSWriter::SourceInfo::onMessageReceived(const sp<AMessage> &msg) { 367 switch (msg->what()) { 368 case kWhatStart: 369 { 370 status_t err = mSource->start(); 371 if (err != OK) { 372 sp<AMessage> notify = mNotify->dup(); 373 notify->setInt32("what", kNotifyStartFailed); 374 notify->post(); 375 break; 376 } 377 378 extractCodecSpecificData(); 379 380 readMore(); 381 break; 382 } 383 384 case kWhatRead: 385 { 386 MediaBuffer *buffer; 387 status_t err = mSource->read(&buffer); 388 389 if (err != OK && err != INFO_FORMAT_CHANGED) { 390 if (mStreamType == 0x0f) { 391 flushAACFrames(); 392 } 393 394 sp<AMessage> notify = mNotify->dup(); 395 notify->setInt32("what", kNotifyReachedEOS); 396 notify->setInt32("status", err); 397 notify->post(); 398 break; 399 } 400 401 if (err == OK) { 402 if (mStreamType == 0x0f && mAACCodecSpecificData == NULL) { 403 // The first buffer contains codec specific data. 404 405 CHECK_GE(buffer->range_length(), 2u); 406 407 mAACCodecSpecificData = new ABuffer(buffer->range_length()); 408 409 memcpy(mAACCodecSpecificData->data(), 410 (const uint8_t *)buffer->data() 411 + buffer->range_offset(), 412 buffer->range_length()); 413 } else if (buffer->range_length() > 0) { 414 if (mStreamType == 0x0f) { 415 if (!appendAACFrames(buffer)) { 416 msg->post(); 417 } 418 } else { 419 postAVCFrame(buffer); 420 } 421 } 422 423 buffer->release(); 424 buffer = NULL; 425 } 426 427 // Do not read more data until told to. 428 break; 429 } 430 431 default: 432 TRESPASS(); 433 } 434} 435 436sp<ABuffer> MPEG2TSWriter::SourceInfo::lastAccessUnit() { 437 return mLastAccessUnit; 438} 439 440void MPEG2TSWriter::SourceInfo::setLastAccessUnit( 441 const sp<ABuffer> &accessUnit) { 442 mLastAccessUnit = accessUnit; 443} 444 445int64_t MPEG2TSWriter::SourceInfo::lastAccessUnitTimeUs() { 446 if (mLastAccessUnit == NULL) { 447 return -1; 448 } 449 450 int64_t timeUs; 451 CHECK(mLastAccessUnit->meta()->findInt64("timeUs", &timeUs)); 452 453 return timeUs; 454} 455 456void MPEG2TSWriter::SourceInfo::setEOSReceived() { 457 CHECK(!mEOSReceived); 458 mEOSReceived = true; 459} 460 461bool MPEG2TSWriter::SourceInfo::eosReceived() const { 462 return mEOSReceived; 463} 464 465//////////////////////////////////////////////////////////////////////////////// 466 467MPEG2TSWriter::MPEG2TSWriter(int fd) 468 : mFile(fdopen(dup(fd), "wb")), 469 mWriteCookie(NULL), 470 mWriteFunc(NULL), 471 mStarted(false), 472 mNumSourcesDone(0), 473 mNumTSPacketsWritten(0), 474 mNumTSPacketsBeforeMeta(0), 475 mPATContinuityCounter(0), 476 mPMTContinuityCounter(0) { 477 init(); 478} 479 480MPEG2TSWriter::MPEG2TSWriter(const char *filename) 481 : mFile(fopen(filename, "wb")), 482 mWriteCookie(NULL), 483 mWriteFunc(NULL), 484 mStarted(false), 485 mNumSourcesDone(0), 486 mNumTSPacketsWritten(0), 487 mNumTSPacketsBeforeMeta(0), 488 mPATContinuityCounter(0), 489 mPMTContinuityCounter(0) { 490 init(); 491} 492 493MPEG2TSWriter::MPEG2TSWriter( 494 void *cookie, 495 ssize_t (*write)(void *cookie, const void *data, size_t size)) 496 : mFile(NULL), 497 mWriteCookie(cookie), 498 mWriteFunc(write), 499 mStarted(false), 500 mNumSourcesDone(0), 501 mNumTSPacketsWritten(0), 502 mNumTSPacketsBeforeMeta(0), 503 mPATContinuityCounter(0), 504 mPMTContinuityCounter(0) { 505 init(); 506} 507 508void MPEG2TSWriter::init() { 509 CHECK(mFile != NULL || mWriteFunc != NULL); 510 511 mLooper = new ALooper; 512 mLooper->setName("MPEG2TSWriter"); 513 514 mReflector = new AHandlerReflector<MPEG2TSWriter>(this); 515 516 mLooper->registerHandler(mReflector); 517 mLooper->start(); 518} 519 520MPEG2TSWriter::~MPEG2TSWriter() { 521 if (mStarted) { 522 reset(); 523 } 524 525 mLooper->unregisterHandler(mReflector->id()); 526 mLooper->stop(); 527 528 if (mFile != NULL) { 529 fclose(mFile); 530 mFile = NULL; 531 } 532} 533 534status_t MPEG2TSWriter::addSource(const sp<MediaSource> &source) { 535 CHECK(!mStarted); 536 537 sp<MetaData> meta = source->getFormat(); 538 const char *mime; 539 CHECK(meta->findCString(kKeyMIMEType, &mime)); 540 541 if (strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC) 542 && strcasecmp(mime, MEDIA_MIMETYPE_AUDIO_AAC)) { 543 return ERROR_UNSUPPORTED; 544 } 545 546 sp<SourceInfo> info = new SourceInfo(source); 547 548 mSources.push(info); 549 550 return OK; 551} 552 553status_t MPEG2TSWriter::start(MetaData *param) { 554 CHECK(!mStarted); 555 556 mStarted = true; 557 mNumSourcesDone = 0; 558 mNumTSPacketsWritten = 0; 559 mNumTSPacketsBeforeMeta = 0; 560 561 for (size_t i = 0; i < mSources.size(); ++i) { 562 sp<AMessage> notify = 563 new AMessage(kWhatSourceNotify, mReflector->id()); 564 565 notify->setInt32("source-index", i); 566 567 mSources.editItemAt(i)->start(notify); 568 } 569 570 return OK; 571} 572 573status_t MPEG2TSWriter::reset() { 574 CHECK(mStarted); 575 576 for (size_t i = 0; i < mSources.size(); ++i) { 577 mSources.editItemAt(i)->stop(); 578 } 579 mStarted = false; 580 581 return OK; 582} 583 584status_t MPEG2TSWriter::pause() { 585 CHECK(mStarted); 586 587 return OK; 588} 589 590bool MPEG2TSWriter::reachedEOS() { 591 return !mStarted || (mNumSourcesDone == mSources.size() ? true : false); 592} 593 594status_t MPEG2TSWriter::dump(int fd, const Vector<String16> &args) { 595 return OK; 596} 597 598void MPEG2TSWriter::onMessageReceived(const sp<AMessage> &msg) { 599 switch (msg->what()) { 600 case kWhatSourceNotify: 601 { 602 int32_t sourceIndex; 603 CHECK(msg->findInt32("source-index", &sourceIndex)); 604 605 int32_t what; 606 CHECK(msg->findInt32("what", &what)); 607 608 if (what == SourceInfo::kNotifyReachedEOS 609 || what == SourceInfo::kNotifyStartFailed) { 610 sp<SourceInfo> source = mSources.editItemAt(sourceIndex); 611 source->setEOSReceived(); 612 613 sp<ABuffer> buffer = source->lastAccessUnit(); 614 source->setLastAccessUnit(NULL); 615 616 if (buffer != NULL) { 617 writeTS(); 618 writeAccessUnit(sourceIndex, buffer); 619 } 620 621 ++mNumSourcesDone; 622 } else if (what == SourceInfo::kNotifyBuffer) { 623 sp<ABuffer> buffer; 624 CHECK(msg->findBuffer("buffer", &buffer)); 625 626 int32_t oob; 627 if (msg->findInt32("oob", &oob) && oob) { 628 // This is codec specific data delivered out of band. 629 // It can be written out immediately. 630 writeTS(); 631 writeAccessUnit(sourceIndex, buffer); 632 break; 633 } 634 635 // We don't just write out data as we receive it from 636 // the various sources. That would essentially write them 637 // out in random order (as the thread scheduler determines 638 // how the messages are dispatched). 639 // Instead we gather an access unit for all tracks and 640 // write out the one with the smallest timestamp, then 641 // request more data for the written out track. 642 // Rinse, repeat. 643 // If we don't have data on any track we don't write 644 // anything just yet. 645 646 sp<SourceInfo> source = mSources.editItemAt(sourceIndex); 647 648 CHECK(source->lastAccessUnit() == NULL); 649 source->setLastAccessUnit(buffer); 650 651 ALOGV("lastAccessUnitTimeUs[%d] = %.2f secs", 652 sourceIndex, source->lastAccessUnitTimeUs() / 1E6); 653 654 int64_t minTimeUs = -1; 655 size_t minIndex = 0; 656 657 for (size_t i = 0; i < mSources.size(); ++i) { 658 const sp<SourceInfo> &source = mSources.editItemAt(i); 659 660 if (source->eosReceived()) { 661 continue; 662 } 663 664 int64_t timeUs = source->lastAccessUnitTimeUs(); 665 if (timeUs < 0) { 666 minTimeUs = -1; 667 break; 668 } else if (minTimeUs < 0 || timeUs < minTimeUs) { 669 minTimeUs = timeUs; 670 minIndex = i; 671 } 672 } 673 674 if (minTimeUs < 0) { 675 ALOGV("not a all tracks have valid data."); 676 break; 677 } 678 679 ALOGV("writing access unit at time %.2f secs (index %d)", 680 minTimeUs / 1E6, minIndex); 681 682 source = mSources.editItemAt(minIndex); 683 684 buffer = source->lastAccessUnit(); 685 source->setLastAccessUnit(NULL); 686 687 writeTS(); 688 writeAccessUnit(minIndex, buffer); 689 690 source->readMore(); 691 } 692 break; 693 } 694 695 default: 696 TRESPASS(); 697 } 698} 699 700void MPEG2TSWriter::writeProgramAssociationTable() { 701 // 0x47 702 // transport_error_indicator = b0 703 // payload_unit_start_indicator = b1 704 // transport_priority = b0 705 // PID = b0000000000000 (13 bits) 706 // transport_scrambling_control = b00 707 // adaptation_field_control = b01 (no adaptation field, payload only) 708 // continuity_counter = b???? 709 // skip = 0x00 710 // --- payload follows 711 // table_id = 0x00 712 // section_syntax_indicator = b1 713 // must_be_zero = b0 714 // reserved = b11 715 // section_length = 0x00d 716 // transport_stream_id = 0x0000 717 // reserved = b11 718 // version_number = b00001 719 // current_next_indicator = b1 720 // section_number = 0x00 721 // last_section_number = 0x00 722 // one program follows: 723 // program_number = 0x0001 724 // reserved = b111 725 // program_map_PID = 0x01e0 (13 bits!) 726 // CRC = 0x???????? 727 728 static const uint8_t kData[] = { 729 0x47, 730 0x40, 0x00, 0x10, 0x00, // b0100 0000 0000 0000 0001 ???? 0000 0000 731 0x00, 0xb0, 0x0d, 0x00, // b0000 0000 1011 0000 0000 1101 0000 0000 732 0x00, 0xc3, 0x00, 0x00, // b0000 0000 1100 0011 0000 0000 0000 0000 733 0x00, 0x01, 0xe1, 0xe0, // b0000 0000 0000 0001 1110 0001 1110 0000 734 0x00, 0x00, 0x00, 0x00 // b???? ???? ???? ???? ???? ???? ???? ???? 735 }; 736 737 sp<ABuffer> buffer = new ABuffer(188); 738 memset(buffer->data(), 0, buffer->size()); 739 memcpy(buffer->data(), kData, sizeof(kData)); 740 741 if (++mPATContinuityCounter == 16) { 742 mPATContinuityCounter = 0; 743 } 744 buffer->data()[3] |= mPATContinuityCounter; 745 746 CHECK_EQ(internalWrite(buffer->data(), buffer->size()), buffer->size()); 747} 748 749void MPEG2TSWriter::writeProgramMap() { 750 // 0x47 751 // transport_error_indicator = b0 752 // payload_unit_start_indicator = b1 753 // transport_priority = b0 754 // PID = b0 0001 1110 0000 (13 bits) [0x1e0] 755 // transport_scrambling_control = b00 756 // adaptation_field_control = b01 (no adaptation field, payload only) 757 // continuity_counter = b???? 758 // skip = 0x00 759 // -- payload follows 760 // table_id = 0x02 761 // section_syntax_indicator = b1 762 // must_be_zero = b0 763 // reserved = b11 764 // section_length = 0x??? 765 // program_number = 0x0001 766 // reserved = b11 767 // version_number = b00001 768 // current_next_indicator = b1 769 // section_number = 0x00 770 // last_section_number = 0x00 771 // reserved = b111 772 // PCR_PID = b? ???? ???? ???? (13 bits) 773 // reserved = b1111 774 // program_info_length = 0x000 775 // one or more elementary stream descriptions follow: 776 // stream_type = 0x?? 777 // reserved = b111 778 // elementary_PID = b? ???? ???? ???? (13 bits) 779 // reserved = b1111 780 // ES_info_length = 0x000 781 // CRC = 0x???????? 782 783 static const uint8_t kData[] = { 784 0x47, 785 0x41, 0xe0, 0x10, 0x00, // b0100 0001 1110 0000 0001 ???? 0000 0000 786 0x02, 0xb0, 0x00, 0x00, // b0000 0010 1011 ???? ???? ???? 0000 0000 787 0x01, 0xc3, 0x00, 0x00, // b0000 0001 1100 0011 0000 0000 0000 0000 788 0xe0, 0x00, 0xf0, 0x00 // b111? ???? ???? ???? 1111 0000 0000 0000 789 }; 790 791 sp<ABuffer> buffer = new ABuffer(188); 792 memset(buffer->data(), 0, buffer->size()); 793 memcpy(buffer->data(), kData, sizeof(kData)); 794 795 if (++mPMTContinuityCounter == 16) { 796 mPMTContinuityCounter = 0; 797 } 798 buffer->data()[3] |= mPMTContinuityCounter; 799 800 size_t section_length = 5 * mSources.size() + 4 + 9; 801 buffer->data()[6] |= section_length >> 8; 802 buffer->data()[7] = section_length & 0xff; 803 804 static const unsigned kPCR_PID = 0x1e1; 805 buffer->data()[13] |= (kPCR_PID >> 8) & 0x1f; 806 buffer->data()[14] = kPCR_PID & 0xff; 807 808 uint8_t *ptr = &buffer->data()[sizeof(kData)]; 809 for (size_t i = 0; i < mSources.size(); ++i) { 810 *ptr++ = mSources.editItemAt(i)->streamType(); 811 812 const unsigned ES_PID = 0x1e0 + i + 1; 813 *ptr++ = 0xe0 | (ES_PID >> 8); 814 *ptr++ = ES_PID & 0xff; 815 *ptr++ = 0xf0; 816 *ptr++ = 0x00; 817 } 818 819 *ptr++ = 0x00; 820 *ptr++ = 0x00; 821 *ptr++ = 0x00; 822 *ptr++ = 0x00; 823 824 CHECK_EQ(internalWrite(buffer->data(), buffer->size()), buffer->size()); 825} 826 827void MPEG2TSWriter::writeAccessUnit( 828 int32_t sourceIndex, const sp<ABuffer> &accessUnit) { 829 // 0x47 830 // transport_error_indicator = b0 831 // payload_unit_start_indicator = b1 832 // transport_priority = b0 833 // PID = b0 0001 1110 ???? (13 bits) [0x1e0 + 1 + sourceIndex] 834 // transport_scrambling_control = b00 835 // adaptation_field_control = b01 (no adaptation field, payload only) 836 // continuity_counter = b???? 837 // -- payload follows 838 // packet_startcode_prefix = 0x000001 839 // stream_id = 0x?? (0xe0 for avc video, 0xc0 for aac audio) 840 // PES_packet_length = 0x???? 841 // reserved = b10 842 // PES_scrambling_control = b00 843 // PES_priority = b0 844 // data_alignment_indicator = b1 845 // copyright = b0 846 // original_or_copy = b0 847 // PTS_DTS_flags = b10 (PTS only) 848 // ESCR_flag = b0 849 // ES_rate_flag = b0 850 // DSM_trick_mode_flag = b0 851 // additional_copy_info_flag = b0 852 // PES_CRC_flag = b0 853 // PES_extension_flag = b0 854 // PES_header_data_length = 0x05 855 // reserved = b0010 (PTS) 856 // PTS[32..30] = b??? 857 // reserved = b1 858 // PTS[29..15] = b??? ???? ???? ???? (15 bits) 859 // reserved = b1 860 // PTS[14..0] = b??? ???? ???? ???? (15 bits) 861 // reserved = b1 862 // the first fragment of "buffer" follows 863 864 sp<ABuffer> buffer = new ABuffer(188); 865 memset(buffer->data(), 0, buffer->size()); 866 867 const unsigned PID = 0x1e0 + sourceIndex + 1; 868 869 const unsigned continuity_counter = 870 mSources.editItemAt(sourceIndex)->incrementContinuityCounter(); 871 872 // XXX if there are multiple streams of a kind (more than 1 audio or 873 // more than 1 video) they need distinct stream_ids. 874 const unsigned stream_id = 875 mSources.editItemAt(sourceIndex)->streamType() == 0x0f ? 0xc0 : 0xe0; 876 877 int64_t timeUs; 878 CHECK(accessUnit->meta()->findInt64("timeUs", &timeUs)); 879 880 uint32_t PTS = (timeUs * 9ll) / 100ll; 881 882 size_t PES_packet_length = accessUnit->size() + 8; 883 884 if (PES_packet_length >= 65536) { 885 // This really should only happen for video. 886 CHECK_EQ(stream_id, 0xe0u); 887 888 // It's valid to set this to 0 for video according to the specs. 889 PES_packet_length = 0; 890 } 891 892 uint8_t *ptr = buffer->data(); 893 *ptr++ = 0x47; 894 *ptr++ = 0x40 | (PID >> 8); 895 *ptr++ = PID & 0xff; 896 *ptr++ = 0x10 | continuity_counter; 897 *ptr++ = 0x00; 898 *ptr++ = 0x00; 899 *ptr++ = 0x01; 900 *ptr++ = stream_id; 901 *ptr++ = PES_packet_length >> 8; 902 *ptr++ = PES_packet_length & 0xff; 903 *ptr++ = 0x84; 904 *ptr++ = 0x80; 905 *ptr++ = 0x05; 906 *ptr++ = 0x20 | (((PTS >> 30) & 7) << 1) | 1; 907 *ptr++ = (PTS >> 22) & 0xff; 908 *ptr++ = (((PTS >> 15) & 0x7f) << 1) | 1; 909 *ptr++ = (PTS >> 7) & 0xff; 910 *ptr++ = ((PTS & 0x7f) << 1) | 1; 911 912 size_t sizeLeft = buffer->data() + buffer->size() - ptr; 913 size_t copy = accessUnit->size(); 914 if (copy > sizeLeft) { 915 copy = sizeLeft; 916 } 917 918 memcpy(ptr, accessUnit->data(), copy); 919 920 CHECK_EQ(internalWrite(buffer->data(), buffer->size()), buffer->size()); 921 922 size_t offset = copy; 923 while (offset < accessUnit->size()) { 924 // for subsequent fragments of "buffer": 925 // 0x47 926 // transport_error_indicator = b0 927 // payload_unit_start_indicator = b0 928 // transport_priority = b0 929 // PID = b0 0001 1110 ???? (13 bits) [0x1e0 + 1 + sourceIndex] 930 // transport_scrambling_control = b00 931 // adaptation_field_control = b01 (no adaptation field, payload only) 932 // continuity_counter = b???? 933 // the fragment of "buffer" follows. 934 935 memset(buffer->data(), 0, buffer->size()); 936 937 const unsigned continuity_counter = 938 mSources.editItemAt(sourceIndex)->incrementContinuityCounter(); 939 940 ptr = buffer->data(); 941 *ptr++ = 0x47; 942 *ptr++ = 0x00 | (PID >> 8); 943 *ptr++ = PID & 0xff; 944 *ptr++ = 0x10 | continuity_counter; 945 946 size_t sizeLeft = buffer->data() + buffer->size() - ptr; 947 size_t copy = accessUnit->size() - offset; 948 if (copy > sizeLeft) { 949 copy = sizeLeft; 950 } 951 952 memcpy(ptr, accessUnit->data() + offset, copy); 953 CHECK_EQ(internalWrite(buffer->data(), buffer->size()), 954 buffer->size()); 955 956 offset += copy; 957 } 958} 959 960void MPEG2TSWriter::writeTS() { 961 if (mNumTSPacketsWritten >= mNumTSPacketsBeforeMeta) { 962 writeProgramAssociationTable(); 963 writeProgramMap(); 964 965 mNumTSPacketsBeforeMeta = mNumTSPacketsWritten + 2500; 966 } 967} 968 969ssize_t MPEG2TSWriter::internalWrite(const void *data, size_t size) { 970 if (mFile != NULL) { 971 return fwrite(data, 1, size, mFile); 972 } 973 974 return (*mWriteFunc)(mWriteCookie, data, size); 975} 976 977} // namespace android 978 979