ATSParser.cpp revision 94a483bf2bd699275673d9cd57cb125d48572f30
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 "ATSParser" 19#include <utils/Log.h> 20 21#include "ATSParser.h" 22 23#include "AnotherPacketSource.h" 24#include "ESQueue.h" 25#include "include/avc_utils.h" 26 27#include <media/stagefright/foundation/ABitReader.h> 28#include <media/stagefright/foundation/ABuffer.h> 29#include <media/stagefright/foundation/ADebug.h> 30#include <media/stagefright/foundation/AMessage.h> 31#include <media/stagefright/foundation/hexdump.h> 32#include <media/stagefright/MediaDefs.h> 33#include <media/stagefright/MediaErrors.h> 34#include <media/stagefright/MetaData.h> 35#include <media/stagefright/Utils.h> 36#include <media/IStreamSource.h> 37#include <utils/KeyedVector.h> 38 39namespace android { 40 41// I want the expression "y" evaluated even if verbose logging is off. 42#define MY_LOGV(x, y) \ 43 do { unsigned tmp = y; ALOGV(x, tmp); } while (0) 44 45static const size_t kTSPacketSize = 188; 46 47struct ATSParser::Program : public RefBase { 48 Program(ATSParser *parser, unsigned programNumber, unsigned programMapPID); 49 50 bool parsePSISection( 51 unsigned pid, ABitReader *br, status_t *err); 52 53 bool parsePID( 54 unsigned pid, unsigned continuity_counter, 55 unsigned payload_unit_start_indicator, 56 ABitReader *br, status_t *err); 57 58 void signalDiscontinuity( 59 DiscontinuityType type, const sp<AMessage> &extra); 60 61 void signalEOS(status_t finalResult); 62 63 sp<MediaSource> getSource(SourceType type); 64 65 int64_t convertPTSToTimestamp(uint64_t PTS); 66 67 bool PTSTimeDeltaEstablished() const { 68 return mFirstPTSValid; 69 } 70 71 unsigned number() const { return mProgramNumber; } 72 73 void updateProgramMapPID(unsigned programMapPID) { 74 mProgramMapPID = programMapPID; 75 } 76 77 unsigned programMapPID() const { 78 return mProgramMapPID; 79 } 80 81 uint32_t parserFlags() const { 82 return mParser->mFlags; 83 } 84 85private: 86 ATSParser *mParser; 87 unsigned mProgramNumber; 88 unsigned mProgramMapPID; 89 KeyedVector<unsigned, sp<Stream> > mStreams; 90 bool mFirstPTSValid; 91 uint64_t mFirstPTS; 92 93 status_t parseProgramMap(ABitReader *br); 94 95 DISALLOW_EVIL_CONSTRUCTORS(Program); 96}; 97 98struct ATSParser::Stream : public RefBase { 99 Stream(Program *program, 100 unsigned elementaryPID, 101 unsigned streamType, 102 unsigned PCR_PID); 103 104 unsigned type() const { return mStreamType; } 105 unsigned pid() const { return mElementaryPID; } 106 void setPID(unsigned pid) { mElementaryPID = pid; } 107 108 status_t parse( 109 unsigned continuity_counter, 110 unsigned payload_unit_start_indicator, 111 ABitReader *br); 112 113 void signalDiscontinuity( 114 DiscontinuityType type, const sp<AMessage> &extra); 115 116 void signalEOS(status_t finalResult); 117 118 sp<MediaSource> getSource(SourceType type); 119 120protected: 121 virtual ~Stream(); 122 123private: 124 Program *mProgram; 125 unsigned mElementaryPID; 126 unsigned mStreamType; 127 unsigned mPCR_PID; 128 int32_t mExpectedContinuityCounter; 129 130 sp<ABuffer> mBuffer; 131 sp<AnotherPacketSource> mSource; 132 bool mPayloadStarted; 133 134 uint64_t mPrevPTS; 135 136 ElementaryStreamQueue *mQueue; 137 138 status_t flush(); 139 status_t parsePES(ABitReader *br); 140 141 void onPayloadData( 142 unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS, 143 const uint8_t *data, size_t size); 144 145 void extractAACFrames(const sp<ABuffer> &buffer); 146 147 bool isAudio() const; 148 bool isVideo() const; 149 150 DISALLOW_EVIL_CONSTRUCTORS(Stream); 151}; 152 153struct ATSParser::PSISection : public RefBase { 154 PSISection(); 155 156 status_t append(const void *data, size_t size); 157 void clear(); 158 159 bool isComplete() const; 160 bool isEmpty() const; 161 162 const uint8_t *data() const; 163 size_t size() const; 164 165protected: 166 virtual ~PSISection(); 167 168private: 169 sp<ABuffer> mBuffer; 170 171 DISALLOW_EVIL_CONSTRUCTORS(PSISection); 172}; 173 174//////////////////////////////////////////////////////////////////////////////// 175 176ATSParser::Program::Program( 177 ATSParser *parser, unsigned programNumber, unsigned programMapPID) 178 : mParser(parser), 179 mProgramNumber(programNumber), 180 mProgramMapPID(programMapPID), 181 mFirstPTSValid(false), 182 mFirstPTS(0) { 183 ALOGV("new program number %u", programNumber); 184} 185 186bool ATSParser::Program::parsePSISection( 187 unsigned pid, ABitReader *br, status_t *err) { 188 *err = OK; 189 190 if (pid != mProgramMapPID) { 191 return false; 192 } 193 194 *err = parseProgramMap(br); 195 196 return true; 197} 198 199bool ATSParser::Program::parsePID( 200 unsigned pid, unsigned continuity_counter, 201 unsigned payload_unit_start_indicator, 202 ABitReader *br, status_t *err) { 203 *err = OK; 204 205 ssize_t index = mStreams.indexOfKey(pid); 206 if (index < 0) { 207 return false; 208 } 209 210 *err = mStreams.editValueAt(index)->parse( 211 continuity_counter, payload_unit_start_indicator, br); 212 213 return true; 214} 215 216void ATSParser::Program::signalDiscontinuity( 217 DiscontinuityType type, const sp<AMessage> &extra) { 218 int64_t mediaTimeUs; 219 if ((type & DISCONTINUITY_TIME) 220 && extra != NULL 221 && extra->findInt64( 222 IStreamListener::kKeyMediaTimeUs, &mediaTimeUs)) { 223 mFirstPTSValid = false; 224 } 225 226 for (size_t i = 0; i < mStreams.size(); ++i) { 227 mStreams.editValueAt(i)->signalDiscontinuity(type, extra); 228 } 229} 230 231void ATSParser::Program::signalEOS(status_t finalResult) { 232 for (size_t i = 0; i < mStreams.size(); ++i) { 233 mStreams.editValueAt(i)->signalEOS(finalResult); 234 } 235} 236 237struct StreamInfo { 238 unsigned mType; 239 unsigned mPID; 240}; 241 242status_t ATSParser::Program::parseProgramMap(ABitReader *br) { 243 unsigned table_id = br->getBits(8); 244 ALOGV(" table_id = %u", table_id); 245 CHECK_EQ(table_id, 0x02u); 246 247 unsigned section_syntax_indicator = br->getBits(1); 248 ALOGV(" section_syntax_indicator = %u", section_syntax_indicator); 249 CHECK_EQ(section_syntax_indicator, 1u); 250 251 CHECK_EQ(br->getBits(1), 0u); 252 MY_LOGV(" reserved = %u", br->getBits(2)); 253 254 unsigned section_length = br->getBits(12); 255 ALOGV(" section_length = %u", section_length); 256 CHECK_EQ(section_length & 0xc00, 0u); 257 CHECK_LE(section_length, 1021u); 258 259 MY_LOGV(" program_number = %u", br->getBits(16)); 260 MY_LOGV(" reserved = %u", br->getBits(2)); 261 MY_LOGV(" version_number = %u", br->getBits(5)); 262 MY_LOGV(" current_next_indicator = %u", br->getBits(1)); 263 MY_LOGV(" section_number = %u", br->getBits(8)); 264 MY_LOGV(" last_section_number = %u", br->getBits(8)); 265 MY_LOGV(" reserved = %u", br->getBits(3)); 266 267 unsigned PCR_PID = br->getBits(13); 268 ALOGV(" PCR_PID = 0x%04x", PCR_PID); 269 270 MY_LOGV(" reserved = %u", br->getBits(4)); 271 272 unsigned program_info_length = br->getBits(12); 273 ALOGV(" program_info_length = %u", program_info_length); 274 CHECK_EQ(program_info_length & 0xc00, 0u); 275 276 br->skipBits(program_info_length * 8); // skip descriptors 277 278 Vector<StreamInfo> infos; 279 280 // infoBytesRemaining is the number of bytes that make up the 281 // variable length section of ES_infos. It does not include the 282 // final CRC. 283 size_t infoBytesRemaining = section_length - 9 - program_info_length - 4; 284 285 while (infoBytesRemaining > 0) { 286 CHECK_GE(infoBytesRemaining, 5u); 287 288 unsigned streamType = br->getBits(8); 289 ALOGV(" stream_type = 0x%02x", streamType); 290 291 MY_LOGV(" reserved = %u", br->getBits(3)); 292 293 unsigned elementaryPID = br->getBits(13); 294 ALOGV(" elementary_PID = 0x%04x", elementaryPID); 295 296 MY_LOGV(" reserved = %u", br->getBits(4)); 297 298 unsigned ES_info_length = br->getBits(12); 299 ALOGV(" ES_info_length = %u", ES_info_length); 300 CHECK_EQ(ES_info_length & 0xc00, 0u); 301 302 CHECK_GE(infoBytesRemaining - 5, ES_info_length); 303 304#if 0 305 br->skipBits(ES_info_length * 8); // skip descriptors 306#else 307 unsigned info_bytes_remaining = ES_info_length; 308 while (info_bytes_remaining >= 2) { 309 MY_LOGV(" tag = 0x%02x", br->getBits(8)); 310 311 unsigned descLength = br->getBits(8); 312 ALOGV(" len = %u", descLength); 313 314 CHECK_GE(info_bytes_remaining, 2 + descLength); 315 316 br->skipBits(descLength * 8); 317 318 info_bytes_remaining -= descLength + 2; 319 } 320 CHECK_EQ(info_bytes_remaining, 0u); 321#endif 322 323 StreamInfo info; 324 info.mType = streamType; 325 info.mPID = elementaryPID; 326 infos.push(info); 327 328 infoBytesRemaining -= 5 + ES_info_length; 329 } 330 331 CHECK_EQ(infoBytesRemaining, 0u); 332 MY_LOGV(" CRC = 0x%08x", br->getBits(32)); 333 334 bool PIDsChanged = false; 335 for (size_t i = 0; i < infos.size(); ++i) { 336 StreamInfo &info = infos.editItemAt(i); 337 338 ssize_t index = mStreams.indexOfKey(info.mPID); 339 340 if (index >= 0 && mStreams.editValueAt(index)->type() != info.mType) { 341 ALOGI("uh oh. stream PIDs have changed."); 342 PIDsChanged = true; 343 break; 344 } 345 } 346 347 if (PIDsChanged) { 348#if 0 349 ALOGI("before:"); 350 for (size_t i = 0; i < mStreams.size(); ++i) { 351 sp<Stream> stream = mStreams.editValueAt(i); 352 353 ALOGI("PID 0x%08x => type 0x%02x", stream->pid(), stream->type()); 354 } 355 356 ALOGI("after:"); 357 for (size_t i = 0; i < infos.size(); ++i) { 358 StreamInfo &info = infos.editItemAt(i); 359 360 ALOGI("PID 0x%08x => type 0x%02x", info.mPID, info.mType); 361 } 362#endif 363 364 // The only case we can recover from is if we have two streams 365 // and they switched PIDs. 366 367 bool success = false; 368 369 if (mStreams.size() == 2 && infos.size() == 2) { 370 const StreamInfo &info1 = infos.itemAt(0); 371 const StreamInfo &info2 = infos.itemAt(1); 372 373 sp<Stream> s1 = mStreams.editValueAt(0); 374 sp<Stream> s2 = mStreams.editValueAt(1); 375 376 bool caseA = 377 info1.mPID == s1->pid() && info1.mType == s2->type() 378 && info2.mPID == s2->pid() && info2.mType == s1->type(); 379 380 bool caseB = 381 info1.mPID == s2->pid() && info1.mType == s1->type() 382 && info2.mPID == s1->pid() && info2.mType == s2->type(); 383 384 if (caseA || caseB) { 385 unsigned pid1 = s1->pid(); 386 unsigned pid2 = s2->pid(); 387 s1->setPID(pid2); 388 s2->setPID(pid1); 389 390 mStreams.clear(); 391 mStreams.add(s1->pid(), s1); 392 mStreams.add(s2->pid(), s2); 393 394 success = true; 395 } 396 } 397 398 if (!success) { 399 ALOGI("Stream PIDs changed and we cannot recover."); 400 return ERROR_MALFORMED; 401 } 402 } 403 404 for (size_t i = 0; i < infos.size(); ++i) { 405 StreamInfo &info = infos.editItemAt(i); 406 407 ssize_t index = mStreams.indexOfKey(info.mPID); 408 409 if (index < 0) { 410 sp<Stream> stream = new Stream( 411 this, info.mPID, info.mType, PCR_PID); 412 413 mStreams.add(info.mPID, stream); 414 } 415 } 416 417 return OK; 418} 419 420sp<MediaSource> ATSParser::Program::getSource(SourceType type) { 421 size_t index = (type == AUDIO) ? 0 : 0; 422 423 for (size_t i = 0; i < mStreams.size(); ++i) { 424 sp<MediaSource> source = mStreams.editValueAt(i)->getSource(type); 425 if (source != NULL) { 426 if (index == 0) { 427 return source; 428 } 429 --index; 430 } 431 } 432 433 return NULL; 434} 435 436int64_t ATSParser::Program::convertPTSToTimestamp(uint64_t PTS) { 437 if (!(mParser->mFlags & TS_TIMESTAMPS_ARE_ABSOLUTE)) { 438 if (!mFirstPTSValid) { 439 mFirstPTSValid = true; 440 mFirstPTS = PTS; 441 PTS = 0; 442 } else if (PTS < mFirstPTS) { 443 PTS = 0; 444 } else { 445 PTS -= mFirstPTS; 446 } 447 } 448 449 int64_t timeUs = (PTS * 100) / 9; 450 451 if (mParser->mAbsoluteTimeAnchorUs >= 0ll) { 452 timeUs += mParser->mAbsoluteTimeAnchorUs; 453 } 454 455 return timeUs; 456} 457 458//////////////////////////////////////////////////////////////////////////////// 459 460ATSParser::Stream::Stream( 461 Program *program, 462 unsigned elementaryPID, 463 unsigned streamType, 464 unsigned PCR_PID) 465 : mProgram(program), 466 mElementaryPID(elementaryPID), 467 mStreamType(streamType), 468 mPCR_PID(PCR_PID), 469 mExpectedContinuityCounter(-1), 470 mPayloadStarted(false), 471 mPrevPTS(0), 472 mQueue(NULL) { 473 switch (mStreamType) { 474 case STREAMTYPE_H264: 475 mQueue = new ElementaryStreamQueue( 476 ElementaryStreamQueue::H264, 477 (mProgram->parserFlags() & ALIGNED_VIDEO_DATA) 478 ? ElementaryStreamQueue::kFlag_AlignedData : 0); 479 break; 480 case STREAMTYPE_MPEG2_AUDIO_ADTS: 481 mQueue = new ElementaryStreamQueue(ElementaryStreamQueue::AAC); 482 break; 483 case STREAMTYPE_MPEG1_AUDIO: 484 case STREAMTYPE_MPEG2_AUDIO: 485 mQueue = new ElementaryStreamQueue( 486 ElementaryStreamQueue::MPEG_AUDIO); 487 break; 488 489 case STREAMTYPE_MPEG1_VIDEO: 490 case STREAMTYPE_MPEG2_VIDEO: 491 mQueue = new ElementaryStreamQueue( 492 ElementaryStreamQueue::MPEG_VIDEO); 493 break; 494 495 case STREAMTYPE_MPEG4_VIDEO: 496 mQueue = new ElementaryStreamQueue( 497 ElementaryStreamQueue::MPEG4_VIDEO); 498 break; 499 500 case STREAMTYPE_PCM_AUDIO: 501 mQueue = new ElementaryStreamQueue( 502 ElementaryStreamQueue::PCM_AUDIO); 503 break; 504 505 default: 506 break; 507 } 508 509 ALOGV("new stream PID 0x%02x, type 0x%02x", elementaryPID, streamType); 510 511 if (mQueue != NULL) { 512 mBuffer = new ABuffer(192 * 1024); 513 mBuffer->setRange(0, 0); 514 } 515} 516 517ATSParser::Stream::~Stream() { 518 delete mQueue; 519 mQueue = NULL; 520} 521 522status_t ATSParser::Stream::parse( 523 unsigned continuity_counter, 524 unsigned payload_unit_start_indicator, ABitReader *br) { 525 if (mQueue == NULL) { 526 return OK; 527 } 528 529 if (mExpectedContinuityCounter >= 0 530 && (unsigned)mExpectedContinuityCounter != continuity_counter) { 531 ALOGI("discontinuity on stream pid 0x%04x", mElementaryPID); 532 533 mPayloadStarted = false; 534 mBuffer->setRange(0, 0); 535 mExpectedContinuityCounter = -1; 536 537#if 0 538 // Uncomment this if you'd rather see no corruption whatsoever on 539 // screen and suspend updates until we come across another IDR frame. 540 541 if (mStreamType == STREAMTYPE_H264) { 542 ALOGI("clearing video queue"); 543 mQueue->clear(true /* clearFormat */); 544 } 545#endif 546 547 return OK; 548 } 549 550 mExpectedContinuityCounter = (continuity_counter + 1) & 0x0f; 551 552 if (payload_unit_start_indicator) { 553 if (mPayloadStarted) { 554 // Otherwise we run the danger of receiving the trailing bytes 555 // of a PES packet that we never saw the start of and assuming 556 // we have a a complete PES packet. 557 558 status_t err = flush(); 559 560 if (err != OK) { 561 return err; 562 } 563 } 564 565 mPayloadStarted = true; 566 } 567 568 if (!mPayloadStarted) { 569 return OK; 570 } 571 572 size_t payloadSizeBits = br->numBitsLeft(); 573 CHECK_EQ(payloadSizeBits % 8, 0u); 574 575 size_t neededSize = mBuffer->size() + payloadSizeBits / 8; 576 if (mBuffer->capacity() < neededSize) { 577 // Increment in multiples of 64K. 578 neededSize = (neededSize + 65535) & ~65535; 579 580 ALOGI("resizing buffer to %d bytes", neededSize); 581 582 sp<ABuffer> newBuffer = new ABuffer(neededSize); 583 memcpy(newBuffer->data(), mBuffer->data(), mBuffer->size()); 584 newBuffer->setRange(0, mBuffer->size()); 585 mBuffer = newBuffer; 586 } 587 588 memcpy(mBuffer->data() + mBuffer->size(), br->data(), payloadSizeBits / 8); 589 mBuffer->setRange(0, mBuffer->size() + payloadSizeBits / 8); 590 591 return OK; 592} 593 594bool ATSParser::Stream::isVideo() const { 595 switch (mStreamType) { 596 case STREAMTYPE_H264: 597 case STREAMTYPE_MPEG1_VIDEO: 598 case STREAMTYPE_MPEG2_VIDEO: 599 case STREAMTYPE_MPEG4_VIDEO: 600 return true; 601 602 default: 603 return false; 604 } 605} 606 607bool ATSParser::Stream::isAudio() const { 608 switch (mStreamType) { 609 case STREAMTYPE_MPEG1_AUDIO: 610 case STREAMTYPE_MPEG2_AUDIO: 611 case STREAMTYPE_MPEG2_AUDIO_ADTS: 612 case STREAMTYPE_PCM_AUDIO: 613 return true; 614 615 default: 616 return false; 617 } 618} 619 620void ATSParser::Stream::signalDiscontinuity( 621 DiscontinuityType type, const sp<AMessage> &extra) { 622 mExpectedContinuityCounter = -1; 623 624 if (mQueue == NULL) { 625 return; 626 } 627 628 mPayloadStarted = false; 629 mBuffer->setRange(0, 0); 630 631 bool clearFormat = false; 632 if (isAudio()) { 633 if (type & DISCONTINUITY_AUDIO_FORMAT) { 634 clearFormat = true; 635 } 636 } else { 637 if (type & DISCONTINUITY_VIDEO_FORMAT) { 638 clearFormat = true; 639 } 640 } 641 642 mQueue->clear(clearFormat); 643 644 if (type & DISCONTINUITY_TIME) { 645 uint64_t resumeAtPTS; 646 if (extra != NULL 647 && extra->findInt64( 648 IStreamListener::kKeyResumeAtPTS, 649 (int64_t *)&resumeAtPTS)) { 650 int64_t resumeAtMediaTimeUs = 651 mProgram->convertPTSToTimestamp(resumeAtPTS); 652 653 extra->setInt64("resume-at-mediatimeUs", resumeAtMediaTimeUs); 654 } 655 } 656 657 if (mSource != NULL) { 658 mSource->queueDiscontinuity(type, extra); 659 } 660} 661 662void ATSParser::Stream::signalEOS(status_t finalResult) { 663 if (mSource != NULL) { 664 mSource->signalEOS(finalResult); 665 } 666} 667 668status_t ATSParser::Stream::parsePES(ABitReader *br) { 669 unsigned packet_startcode_prefix = br->getBits(24); 670 671 ALOGV("packet_startcode_prefix = 0x%08x", packet_startcode_prefix); 672 673 if (packet_startcode_prefix != 1) { 674 ALOGV("Supposedly payload_unit_start=1 unit does not start " 675 "with startcode."); 676 677 return ERROR_MALFORMED; 678 } 679 680 CHECK_EQ(packet_startcode_prefix, 0x000001u); 681 682 unsigned stream_id = br->getBits(8); 683 ALOGV("stream_id = 0x%02x", stream_id); 684 685 unsigned PES_packet_length = br->getBits(16); 686 ALOGV("PES_packet_length = %u", PES_packet_length); 687 688 if (stream_id != 0xbc // program_stream_map 689 && stream_id != 0xbe // padding_stream 690 && stream_id != 0xbf // private_stream_2 691 && stream_id != 0xf0 // ECM 692 && stream_id != 0xf1 // EMM 693 && stream_id != 0xff // program_stream_directory 694 && stream_id != 0xf2 // DSMCC 695 && stream_id != 0xf8) { // H.222.1 type E 696 CHECK_EQ(br->getBits(2), 2u); 697 698 MY_LOGV("PES_scrambling_control = %u", br->getBits(2)); 699 MY_LOGV("PES_priority = %u", br->getBits(1)); 700 MY_LOGV("data_alignment_indicator = %u", br->getBits(1)); 701 MY_LOGV("copyright = %u", br->getBits(1)); 702 MY_LOGV("original_or_copy = %u", br->getBits(1)); 703 704 unsigned PTS_DTS_flags = br->getBits(2); 705 ALOGV("PTS_DTS_flags = %u", PTS_DTS_flags); 706 707 unsigned ESCR_flag = br->getBits(1); 708 ALOGV("ESCR_flag = %u", ESCR_flag); 709 710 unsigned ES_rate_flag = br->getBits(1); 711 ALOGV("ES_rate_flag = %u", ES_rate_flag); 712 713 unsigned DSM_trick_mode_flag = br->getBits(1); 714 ALOGV("DSM_trick_mode_flag = %u", DSM_trick_mode_flag); 715 716 unsigned additional_copy_info_flag = br->getBits(1); 717 ALOGV("additional_copy_info_flag = %u", additional_copy_info_flag); 718 719 MY_LOGV("PES_CRC_flag = %u", br->getBits(1)); 720 MY_LOGV("PES_extension_flag = %u", br->getBits(1)); 721 722 unsigned PES_header_data_length = br->getBits(8); 723 ALOGV("PES_header_data_length = %u", PES_header_data_length); 724 725 unsigned optional_bytes_remaining = PES_header_data_length; 726 727 uint64_t PTS = 0, DTS = 0; 728 729 if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) { 730 CHECK_GE(optional_bytes_remaining, 5u); 731 732 CHECK_EQ(br->getBits(4), PTS_DTS_flags); 733 734 PTS = ((uint64_t)br->getBits(3)) << 30; 735 CHECK_EQ(br->getBits(1), 1u); 736 PTS |= ((uint64_t)br->getBits(15)) << 15; 737 CHECK_EQ(br->getBits(1), 1u); 738 PTS |= br->getBits(15); 739 CHECK_EQ(br->getBits(1), 1u); 740 741 ALOGV("PTS = 0x%016llx (%.2f)", PTS, PTS / 90000.0); 742 743 optional_bytes_remaining -= 5; 744 745 if (PTS_DTS_flags == 3) { 746 CHECK_GE(optional_bytes_remaining, 5u); 747 748 CHECK_EQ(br->getBits(4), 1u); 749 750 DTS = ((uint64_t)br->getBits(3)) << 30; 751 CHECK_EQ(br->getBits(1), 1u); 752 DTS |= ((uint64_t)br->getBits(15)) << 15; 753 CHECK_EQ(br->getBits(1), 1u); 754 DTS |= br->getBits(15); 755 CHECK_EQ(br->getBits(1), 1u); 756 757 ALOGV("DTS = %llu", DTS); 758 759 optional_bytes_remaining -= 5; 760 } 761 } 762 763 if (ESCR_flag) { 764 CHECK_GE(optional_bytes_remaining, 6u); 765 766 br->getBits(2); 767 768 uint64_t ESCR = ((uint64_t)br->getBits(3)) << 30; 769 CHECK_EQ(br->getBits(1), 1u); 770 ESCR |= ((uint64_t)br->getBits(15)) << 15; 771 CHECK_EQ(br->getBits(1), 1u); 772 ESCR |= br->getBits(15); 773 CHECK_EQ(br->getBits(1), 1u); 774 775 ALOGV("ESCR = %llu", ESCR); 776 MY_LOGV("ESCR_extension = %u", br->getBits(9)); 777 778 CHECK_EQ(br->getBits(1), 1u); 779 780 optional_bytes_remaining -= 6; 781 } 782 783 if (ES_rate_flag) { 784 CHECK_GE(optional_bytes_remaining, 3u); 785 786 CHECK_EQ(br->getBits(1), 1u); 787 MY_LOGV("ES_rate = %u", br->getBits(22)); 788 CHECK_EQ(br->getBits(1), 1u); 789 790 optional_bytes_remaining -= 3; 791 } 792 793 br->skipBits(optional_bytes_remaining * 8); 794 795 // ES data follows. 796 797 if (PES_packet_length != 0) { 798 CHECK_GE(PES_packet_length, PES_header_data_length + 3); 799 800 unsigned dataLength = 801 PES_packet_length - 3 - PES_header_data_length; 802 803 if (br->numBitsLeft() < dataLength * 8) { 804 ALOGE("PES packet does not carry enough data to contain " 805 "payload. (numBitsLeft = %d, required = %d)", 806 br->numBitsLeft(), dataLength * 8); 807 808 return ERROR_MALFORMED; 809 } 810 811 CHECK_GE(br->numBitsLeft(), dataLength * 8); 812 813 onPayloadData( 814 PTS_DTS_flags, PTS, DTS, br->data(), dataLength); 815 816 br->skipBits(dataLength * 8); 817 } else { 818 onPayloadData( 819 PTS_DTS_flags, PTS, DTS, 820 br->data(), br->numBitsLeft() / 8); 821 822 size_t payloadSizeBits = br->numBitsLeft(); 823 CHECK_EQ(payloadSizeBits % 8, 0u); 824 825 ALOGV("There's %d bytes of payload.", payloadSizeBits / 8); 826 } 827 } else if (stream_id == 0xbe) { // padding_stream 828 CHECK_NE(PES_packet_length, 0u); 829 br->skipBits(PES_packet_length * 8); 830 } else { 831 CHECK_NE(PES_packet_length, 0u); 832 br->skipBits(PES_packet_length * 8); 833 } 834 835 return OK; 836} 837 838status_t ATSParser::Stream::flush() { 839 if (mBuffer->size() == 0) { 840 return OK; 841 } 842 843 ALOGV("flushing stream 0x%04x size = %d", mElementaryPID, mBuffer->size()); 844 845 ABitReader br(mBuffer->data(), mBuffer->size()); 846 847 status_t err = parsePES(&br); 848 849 mBuffer->setRange(0, 0); 850 851 return err; 852} 853 854void ATSParser::Stream::onPayloadData( 855 unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS, 856 const uint8_t *data, size_t size) { 857#if 0 858 ALOGI("payload streamType 0x%02x, PTS = 0x%016llx, dPTS = %lld", 859 mStreamType, 860 PTS, 861 (int64_t)PTS - mPrevPTS); 862 mPrevPTS = PTS; 863#endif 864 865 ALOGV("onPayloadData mStreamType=0x%02x", mStreamType); 866 867 int64_t timeUs = 0ll; // no presentation timestamp available. 868 if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) { 869 timeUs = mProgram->convertPTSToTimestamp(PTS); 870 } 871 872 status_t err = mQueue->appendData(data, size, timeUs); 873 874 if (err != OK) { 875 return; 876 } 877 878 sp<ABuffer> accessUnit; 879 while ((accessUnit = mQueue->dequeueAccessUnit()) != NULL) { 880 if (mSource == NULL) { 881 sp<MetaData> meta = mQueue->getFormat(); 882 883 if (meta != NULL) { 884 ALOGV("Stream PID 0x%08x of type 0x%02x now has data.", 885 mElementaryPID, mStreamType); 886 887 mSource = new AnotherPacketSource(meta); 888 mSource->queueAccessUnit(accessUnit); 889 } 890 } else if (mQueue->getFormat() != NULL) { 891 // After a discontinuity we invalidate the queue's format 892 // and won't enqueue any access units to the source until 893 // the queue has reestablished the new format. 894 895 if (mSource->getFormat() == NULL) { 896 mSource->setFormat(mQueue->getFormat()); 897 } 898 mSource->queueAccessUnit(accessUnit); 899 } 900 } 901} 902 903sp<MediaSource> ATSParser::Stream::getSource(SourceType type) { 904 switch (type) { 905 case VIDEO: 906 { 907 if (isVideo()) { 908 return mSource; 909 } 910 break; 911 } 912 913 case AUDIO: 914 { 915 if (isAudio()) { 916 return mSource; 917 } 918 break; 919 } 920 921 default: 922 break; 923 } 924 925 return NULL; 926} 927 928//////////////////////////////////////////////////////////////////////////////// 929 930ATSParser::ATSParser(uint32_t flags) 931 : mFlags(flags), 932 mAbsoluteTimeAnchorUs(-1ll), 933 mNumTSPacketsParsed(0), 934 mNumPCRs(0) { 935 mPSISections.add(0 /* PID */, new PSISection); 936} 937 938ATSParser::~ATSParser() { 939} 940 941status_t ATSParser::feedTSPacket(const void *data, size_t size) { 942 CHECK_EQ(size, kTSPacketSize); 943 944 ABitReader br((const uint8_t *)data, kTSPacketSize); 945 return parseTS(&br); 946} 947 948void ATSParser::signalDiscontinuity( 949 DiscontinuityType type, const sp<AMessage> &extra) { 950 int64_t mediaTimeUs; 951 if ((type & DISCONTINUITY_TIME) 952 && extra != NULL 953 && extra->findInt64( 954 IStreamListener::kKeyMediaTimeUs, &mediaTimeUs)) { 955 mAbsoluteTimeAnchorUs = mediaTimeUs; 956 } else if (type == DISCONTINUITY_ABSOLUTE_TIME) { 957 int64_t timeUs; 958 CHECK(extra->findInt64("timeUs", &timeUs)); 959 960 CHECK(mPrograms.empty()); 961 mAbsoluteTimeAnchorUs = timeUs; 962 return; 963 } 964 965 for (size_t i = 0; i < mPrograms.size(); ++i) { 966 mPrograms.editItemAt(i)->signalDiscontinuity(type, extra); 967 } 968} 969 970void ATSParser::signalEOS(status_t finalResult) { 971 CHECK_NE(finalResult, (status_t)OK); 972 973 for (size_t i = 0; i < mPrograms.size(); ++i) { 974 mPrograms.editItemAt(i)->signalEOS(finalResult); 975 } 976} 977 978void ATSParser::parseProgramAssociationTable(ABitReader *br) { 979 unsigned table_id = br->getBits(8); 980 ALOGV(" table_id = %u", table_id); 981 CHECK_EQ(table_id, 0x00u); 982 983 unsigned section_syntax_indictor = br->getBits(1); 984 ALOGV(" section_syntax_indictor = %u", section_syntax_indictor); 985 CHECK_EQ(section_syntax_indictor, 1u); 986 987 CHECK_EQ(br->getBits(1), 0u); 988 MY_LOGV(" reserved = %u", br->getBits(2)); 989 990 unsigned section_length = br->getBits(12); 991 ALOGV(" section_length = %u", section_length); 992 CHECK_EQ(section_length & 0xc00, 0u); 993 994 MY_LOGV(" transport_stream_id = %u", br->getBits(16)); 995 MY_LOGV(" reserved = %u", br->getBits(2)); 996 MY_LOGV(" version_number = %u", br->getBits(5)); 997 MY_LOGV(" current_next_indicator = %u", br->getBits(1)); 998 MY_LOGV(" section_number = %u", br->getBits(8)); 999 MY_LOGV(" last_section_number = %u", br->getBits(8)); 1000 1001 size_t numProgramBytes = (section_length - 5 /* header */ - 4 /* crc */); 1002 CHECK_EQ((numProgramBytes % 4), 0u); 1003 1004 for (size_t i = 0; i < numProgramBytes / 4; ++i) { 1005 unsigned program_number = br->getBits(16); 1006 ALOGV(" program_number = %u", program_number); 1007 1008 MY_LOGV(" reserved = %u", br->getBits(3)); 1009 1010 if (program_number == 0) { 1011 MY_LOGV(" network_PID = 0x%04x", br->getBits(13)); 1012 } else { 1013 unsigned programMapPID = br->getBits(13); 1014 1015 ALOGV(" program_map_PID = 0x%04x", programMapPID); 1016 1017 bool found = false; 1018 for (size_t index = 0; index < mPrograms.size(); ++index) { 1019 const sp<Program> &program = mPrograms.itemAt(index); 1020 1021 if (program->number() == program_number) { 1022 program->updateProgramMapPID(programMapPID); 1023 found = true; 1024 break; 1025 } 1026 } 1027 1028 if (!found) { 1029 mPrograms.push( 1030 new Program(this, program_number, programMapPID)); 1031 } 1032 1033 if (mPSISections.indexOfKey(programMapPID) < 0) { 1034 mPSISections.add(programMapPID, new PSISection); 1035 } 1036 } 1037 } 1038 1039 MY_LOGV(" CRC = 0x%08x", br->getBits(32)); 1040} 1041 1042status_t ATSParser::parsePID( 1043 ABitReader *br, unsigned PID, 1044 unsigned continuity_counter, 1045 unsigned payload_unit_start_indicator) { 1046 ssize_t sectionIndex = mPSISections.indexOfKey(PID); 1047 1048 if (sectionIndex >= 0) { 1049 const sp<PSISection> §ion = mPSISections.valueAt(sectionIndex); 1050 1051 if (payload_unit_start_indicator) { 1052 CHECK(section->isEmpty()); 1053 1054 unsigned skip = br->getBits(8); 1055 br->skipBits(skip * 8); 1056 } 1057 1058 1059 CHECK((br->numBitsLeft() % 8) == 0); 1060 status_t err = section->append(br->data(), br->numBitsLeft() / 8); 1061 1062 if (err != OK) { 1063 return err; 1064 } 1065 1066 if (!section->isComplete()) { 1067 return OK; 1068 } 1069 1070 ABitReader sectionBits(section->data(), section->size()); 1071 1072 if (PID == 0) { 1073 parseProgramAssociationTable(§ionBits); 1074 } else { 1075 bool handled = false; 1076 for (size_t i = 0; i < mPrograms.size(); ++i) { 1077 status_t err; 1078 if (!mPrograms.editItemAt(i)->parsePSISection( 1079 PID, §ionBits, &err)) { 1080 continue; 1081 } 1082 1083 if (err != OK) { 1084 return err; 1085 } 1086 1087 handled = true; 1088 break; 1089 } 1090 1091 if (!handled) { 1092 mPSISections.removeItem(PID); 1093 } 1094 } 1095 1096 section->clear(); 1097 1098 return OK; 1099 } 1100 1101 bool handled = false; 1102 for (size_t i = 0; i < mPrograms.size(); ++i) { 1103 status_t err; 1104 if (mPrograms.editItemAt(i)->parsePID( 1105 PID, continuity_counter, payload_unit_start_indicator, 1106 br, &err)) { 1107 if (err != OK) { 1108 return err; 1109 } 1110 1111 handled = true; 1112 break; 1113 } 1114 } 1115 1116 if (!handled) { 1117 ALOGV("PID 0x%04x not handled.", PID); 1118 } 1119 1120 return OK; 1121} 1122 1123void ATSParser::parseAdaptationField(ABitReader *br, unsigned PID) { 1124 unsigned adaptation_field_length = br->getBits(8); 1125 1126 if (adaptation_field_length > 0) { 1127 unsigned discontinuity_indicator = br->getBits(1); 1128 1129 if (discontinuity_indicator) { 1130 ALOGV("PID 0x%04x: discontinuity_indicator = 1 (!!!)", PID); 1131 } 1132 1133 br->skipBits(2); 1134 unsigned PCR_flag = br->getBits(1); 1135 1136 size_t numBitsRead = 4; 1137 1138 if (PCR_flag) { 1139 br->skipBits(4); 1140 uint64_t PCR_base = br->getBits(32); 1141 PCR_base = (PCR_base << 1) | br->getBits(1); 1142 1143 br->skipBits(6); 1144 unsigned PCR_ext = br->getBits(9); 1145 1146 // The number of bytes from the start of the current 1147 // MPEG2 transport stream packet up and including 1148 // the final byte of this PCR_ext field. 1149 size_t byteOffsetFromStartOfTSPacket = 1150 (188 - br->numBitsLeft() / 8); 1151 1152 uint64_t PCR = PCR_base * 300 + PCR_ext; 1153 1154 ALOGV("PID 0x%04x: PCR = 0x%016llx (%.2f)", 1155 PID, PCR, PCR / 27E6); 1156 1157 // The number of bytes received by this parser up to and 1158 // including the final byte of this PCR_ext field. 1159 size_t byteOffsetFromStart = 1160 mNumTSPacketsParsed * 188 + byteOffsetFromStartOfTSPacket; 1161 1162 for (size_t i = 0; i < mPrograms.size(); ++i) { 1163 updatePCR(PID, PCR, byteOffsetFromStart); 1164 } 1165 1166 numBitsRead += 52; 1167 } 1168 1169 CHECK_GE(adaptation_field_length * 8, numBitsRead); 1170 1171 br->skipBits(adaptation_field_length * 8 - numBitsRead); 1172 } 1173} 1174 1175status_t ATSParser::parseTS(ABitReader *br) { 1176 ALOGV("---"); 1177 1178 unsigned sync_byte = br->getBits(8); 1179 CHECK_EQ(sync_byte, 0x47u); 1180 1181 MY_LOGV("transport_error_indicator = %u", br->getBits(1)); 1182 1183 unsigned payload_unit_start_indicator = br->getBits(1); 1184 ALOGV("payload_unit_start_indicator = %u", payload_unit_start_indicator); 1185 1186 MY_LOGV("transport_priority = %u", br->getBits(1)); 1187 1188 unsigned PID = br->getBits(13); 1189 ALOGV("PID = 0x%04x", PID); 1190 1191 MY_LOGV("transport_scrambling_control = %u", br->getBits(2)); 1192 1193 unsigned adaptation_field_control = br->getBits(2); 1194 ALOGV("adaptation_field_control = %u", adaptation_field_control); 1195 1196 unsigned continuity_counter = br->getBits(4); 1197 ALOGV("PID = 0x%04x, continuity_counter = %u", PID, continuity_counter); 1198 1199 // ALOGI("PID = 0x%04x, continuity_counter = %u", PID, continuity_counter); 1200 1201 if (adaptation_field_control == 2 || adaptation_field_control == 3) { 1202 parseAdaptationField(br, PID); 1203 } 1204 1205 status_t err = OK; 1206 1207 if (adaptation_field_control == 1 || adaptation_field_control == 3) { 1208 err = parsePID( 1209 br, PID, continuity_counter, payload_unit_start_indicator); 1210 } 1211 1212 ++mNumTSPacketsParsed; 1213 1214 return err; 1215} 1216 1217sp<MediaSource> ATSParser::getSource(SourceType type) { 1218 int which = -1; // any 1219 1220 for (size_t i = 0; i < mPrograms.size(); ++i) { 1221 const sp<Program> &program = mPrograms.editItemAt(i); 1222 1223 if (which >= 0 && (int)program->number() != which) { 1224 continue; 1225 } 1226 1227 sp<MediaSource> source = program->getSource(type); 1228 1229 if (source != NULL) { 1230 return source; 1231 } 1232 } 1233 1234 return NULL; 1235} 1236 1237bool ATSParser::PTSTimeDeltaEstablished() { 1238 if (mPrograms.isEmpty()) { 1239 return false; 1240 } 1241 1242 return mPrograms.editItemAt(0)->PTSTimeDeltaEstablished(); 1243} 1244 1245void ATSParser::updatePCR( 1246 unsigned PID, uint64_t PCR, size_t byteOffsetFromStart) { 1247 ALOGV("PCR 0x%016llx @ %d", PCR, byteOffsetFromStart); 1248 1249 if (mNumPCRs == 2) { 1250 mPCR[0] = mPCR[1]; 1251 mPCRBytes[0] = mPCRBytes[1]; 1252 mSystemTimeUs[0] = mSystemTimeUs[1]; 1253 mNumPCRs = 1; 1254 } 1255 1256 mPCR[mNumPCRs] = PCR; 1257 mPCRBytes[mNumPCRs] = byteOffsetFromStart; 1258 mSystemTimeUs[mNumPCRs] = ALooper::GetNowUs(); 1259 1260 ++mNumPCRs; 1261 1262 if (mNumPCRs == 2) { 1263 double transportRate = 1264 (mPCRBytes[1] - mPCRBytes[0]) * 27E6 / (mPCR[1] - mPCR[0]); 1265 1266 ALOGV("transportRate = %.2f bytes/sec", transportRate); 1267 } 1268} 1269 1270//////////////////////////////////////////////////////////////////////////////// 1271 1272ATSParser::PSISection::PSISection() { 1273} 1274 1275ATSParser::PSISection::~PSISection() { 1276} 1277 1278status_t ATSParser::PSISection::append(const void *data, size_t size) { 1279 if (mBuffer == NULL || mBuffer->size() + size > mBuffer->capacity()) { 1280 size_t newCapacity = 1281 (mBuffer == NULL) ? size : mBuffer->capacity() + size; 1282 1283 newCapacity = (newCapacity + 1023) & ~1023; 1284 1285 sp<ABuffer> newBuffer = new ABuffer(newCapacity); 1286 1287 if (mBuffer != NULL) { 1288 memcpy(newBuffer->data(), mBuffer->data(), mBuffer->size()); 1289 newBuffer->setRange(0, mBuffer->size()); 1290 } else { 1291 newBuffer->setRange(0, 0); 1292 } 1293 1294 mBuffer = newBuffer; 1295 } 1296 1297 memcpy(mBuffer->data() + mBuffer->size(), data, size); 1298 mBuffer->setRange(0, mBuffer->size() + size); 1299 1300 return OK; 1301} 1302 1303void ATSParser::PSISection::clear() { 1304 if (mBuffer != NULL) { 1305 mBuffer->setRange(0, 0); 1306 } 1307} 1308 1309bool ATSParser::PSISection::isComplete() const { 1310 if (mBuffer == NULL || mBuffer->size() < 3) { 1311 return false; 1312 } 1313 1314 unsigned sectionLength = U16_AT(mBuffer->data() + 1) & 0xfff; 1315 return mBuffer->size() >= sectionLength + 3; 1316} 1317 1318bool ATSParser::PSISection::isEmpty() const { 1319 return mBuffer == NULL || mBuffer->size() == 0; 1320} 1321 1322const uint8_t *ATSParser::PSISection::data() const { 1323 return mBuffer == NULL ? NULL : mBuffer->data(); 1324} 1325 1326size_t ATSParser::PSISection::size() const { 1327 return mBuffer == NULL ? 0 : mBuffer->size(); 1328} 1329 1330} // namespace android 1331