ATSParser.cpp revision 51b9eb1c330d23b98ddb629200cd177bc9c39def
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 39#include <inttypes.h> 40 41namespace android { 42 43// I want the expression "y" evaluated even if verbose logging is off. 44#define MY_LOGV(x, y) \ 45 do { unsigned tmp = y; ALOGV(x, tmp); } while (0) 46 47static const size_t kTSPacketSize = 188; 48 49struct ATSParser::Program : public RefBase { 50 Program(ATSParser *parser, unsigned programNumber, unsigned programMapPID); 51 52 bool parsePSISection( 53 unsigned pid, ABitReader *br, status_t *err); 54 55 bool parsePID( 56 unsigned pid, unsigned continuity_counter, 57 unsigned payload_unit_start_indicator, 58 ABitReader *br, status_t *err); 59 60 void signalDiscontinuity( 61 DiscontinuityType type, const sp<AMessage> &extra); 62 63 void signalEOS(status_t finalResult); 64 65 sp<MediaSource> getSource(SourceType type); 66 67 int64_t convertPTSToTimestamp(uint64_t PTS); 68 69 bool PTSTimeDeltaEstablished() const { 70 return mFirstPTSValid; 71 } 72 73 unsigned number() const { return mProgramNumber; } 74 75 void updateProgramMapPID(unsigned programMapPID) { 76 mProgramMapPID = programMapPID; 77 } 78 79 unsigned programMapPID() const { 80 return mProgramMapPID; 81 } 82 83 uint32_t parserFlags() const { 84 return mParser->mFlags; 85 } 86 87private: 88 ATSParser *mParser; 89 unsigned mProgramNumber; 90 unsigned mProgramMapPID; 91 KeyedVector<unsigned, sp<Stream> > mStreams; 92 bool mFirstPTSValid; 93 uint64_t mFirstPTS; 94 95 status_t parseProgramMap(ABitReader *br); 96 97 DISALLOW_EVIL_CONSTRUCTORS(Program); 98}; 99 100struct ATSParser::Stream : public RefBase { 101 Stream(Program *program, 102 unsigned elementaryPID, 103 unsigned streamType, 104 unsigned PCR_PID); 105 106 unsigned type() const { return mStreamType; } 107 unsigned pid() const { return mElementaryPID; } 108 void setPID(unsigned pid) { mElementaryPID = pid; } 109 110 status_t parse( 111 unsigned continuity_counter, 112 unsigned payload_unit_start_indicator, 113 ABitReader *br); 114 115 void signalDiscontinuity( 116 DiscontinuityType type, const sp<AMessage> &extra); 117 118 void signalEOS(status_t finalResult); 119 120 sp<MediaSource> getSource(SourceType type); 121 122protected: 123 virtual ~Stream(); 124 125private: 126 Program *mProgram; 127 unsigned mElementaryPID; 128 unsigned mStreamType; 129 unsigned mPCR_PID; 130 int32_t mExpectedContinuityCounter; 131 132 sp<ABuffer> mBuffer; 133 sp<AnotherPacketSource> mSource; 134 bool mPayloadStarted; 135 136 uint64_t mPrevPTS; 137 138 ElementaryStreamQueue *mQueue; 139 140 status_t flush(); 141 status_t parsePES(ABitReader *br); 142 143 void onPayloadData( 144 unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS, 145 const uint8_t *data, size_t size); 146 147 void extractAACFrames(const sp<ABuffer> &buffer); 148 149 bool isAudio() const; 150 bool isVideo() const; 151 152 DISALLOW_EVIL_CONSTRUCTORS(Stream); 153}; 154 155struct ATSParser::PSISection : public RefBase { 156 PSISection(); 157 158 status_t append(const void *data, size_t size); 159 void clear(); 160 161 bool isComplete() const; 162 bool isEmpty() const; 163 164 const uint8_t *data() const; 165 size_t size() const; 166 167protected: 168 virtual ~PSISection(); 169 170private: 171 sp<ABuffer> mBuffer; 172 173 DISALLOW_EVIL_CONSTRUCTORS(PSISection); 174}; 175 176//////////////////////////////////////////////////////////////////////////////// 177 178ATSParser::Program::Program( 179 ATSParser *parser, unsigned programNumber, unsigned programMapPID) 180 : mParser(parser), 181 mProgramNumber(programNumber), 182 mProgramMapPID(programMapPID), 183 mFirstPTSValid(false), 184 mFirstPTS(0) { 185 ALOGV("new program number %u", programNumber); 186} 187 188bool ATSParser::Program::parsePSISection( 189 unsigned pid, ABitReader *br, status_t *err) { 190 *err = OK; 191 192 if (pid != mProgramMapPID) { 193 return false; 194 } 195 196 *err = parseProgramMap(br); 197 198 return true; 199} 200 201bool ATSParser::Program::parsePID( 202 unsigned pid, unsigned continuity_counter, 203 unsigned payload_unit_start_indicator, 204 ABitReader *br, status_t *err) { 205 *err = OK; 206 207 ssize_t index = mStreams.indexOfKey(pid); 208 if (index < 0) { 209 return false; 210 } 211 212 *err = mStreams.editValueAt(index)->parse( 213 continuity_counter, payload_unit_start_indicator, br); 214 215 return true; 216} 217 218void ATSParser::Program::signalDiscontinuity( 219 DiscontinuityType type, const sp<AMessage> &extra) { 220 int64_t mediaTimeUs; 221 if ((type & DISCONTINUITY_TIME) 222 && extra != NULL 223 && extra->findInt64( 224 IStreamListener::kKeyMediaTimeUs, &mediaTimeUs)) { 225 mFirstPTSValid = false; 226 } 227 228 for (size_t i = 0; i < mStreams.size(); ++i) { 229 mStreams.editValueAt(i)->signalDiscontinuity(type, extra); 230 } 231} 232 233void ATSParser::Program::signalEOS(status_t finalResult) { 234 for (size_t i = 0; i < mStreams.size(); ++i) { 235 mStreams.editValueAt(i)->signalEOS(finalResult); 236 } 237} 238 239struct StreamInfo { 240 unsigned mType; 241 unsigned mPID; 242}; 243 244status_t ATSParser::Program::parseProgramMap(ABitReader *br) { 245 unsigned table_id = br->getBits(8); 246 ALOGV(" table_id = %u", table_id); 247 CHECK_EQ(table_id, 0x02u); 248 249 unsigned section_syntax_indicator = br->getBits(1); 250 ALOGV(" section_syntax_indicator = %u", section_syntax_indicator); 251 CHECK_EQ(section_syntax_indicator, 1u); 252 253 CHECK_EQ(br->getBits(1), 0u); 254 MY_LOGV(" reserved = %u", br->getBits(2)); 255 256 unsigned section_length = br->getBits(12); 257 ALOGV(" section_length = %u", section_length); 258 CHECK_EQ(section_length & 0xc00, 0u); 259 CHECK_LE(section_length, 1021u); 260 261 MY_LOGV(" program_number = %u", br->getBits(16)); 262 MY_LOGV(" reserved = %u", br->getBits(2)); 263 MY_LOGV(" version_number = %u", br->getBits(5)); 264 MY_LOGV(" current_next_indicator = %u", br->getBits(1)); 265 MY_LOGV(" section_number = %u", br->getBits(8)); 266 MY_LOGV(" last_section_number = %u", br->getBits(8)); 267 MY_LOGV(" reserved = %u", br->getBits(3)); 268 269 unsigned PCR_PID = br->getBits(13); 270 ALOGV(" PCR_PID = 0x%04x", PCR_PID); 271 272 MY_LOGV(" reserved = %u", br->getBits(4)); 273 274 unsigned program_info_length = br->getBits(12); 275 ALOGV(" program_info_length = %u", program_info_length); 276 CHECK_EQ(program_info_length & 0xc00, 0u); 277 278 br->skipBits(program_info_length * 8); // skip descriptors 279 280 Vector<StreamInfo> infos; 281 282 // infoBytesRemaining is the number of bytes that make up the 283 // variable length section of ES_infos. It does not include the 284 // final CRC. 285 size_t infoBytesRemaining = section_length - 9 - program_info_length - 4; 286 287 while (infoBytesRemaining > 0) { 288 CHECK_GE(infoBytesRemaining, 5u); 289 290 unsigned streamType = br->getBits(8); 291 ALOGV(" stream_type = 0x%02x", streamType); 292 293 MY_LOGV(" reserved = %u", br->getBits(3)); 294 295 unsigned elementaryPID = br->getBits(13); 296 ALOGV(" elementary_PID = 0x%04x", elementaryPID); 297 298 MY_LOGV(" reserved = %u", br->getBits(4)); 299 300 unsigned ES_info_length = br->getBits(12); 301 ALOGV(" ES_info_length = %u", ES_info_length); 302 CHECK_EQ(ES_info_length & 0xc00, 0u); 303 304 CHECK_GE(infoBytesRemaining - 5, ES_info_length); 305 306#if 0 307 br->skipBits(ES_info_length * 8); // skip descriptors 308#else 309 unsigned info_bytes_remaining = ES_info_length; 310 while (info_bytes_remaining >= 2) { 311 MY_LOGV(" tag = 0x%02x", br->getBits(8)); 312 313 unsigned descLength = br->getBits(8); 314 ALOGV(" len = %u", descLength); 315 316 CHECK_GE(info_bytes_remaining, 2 + descLength); 317 318 br->skipBits(descLength * 8); 319 320 info_bytes_remaining -= descLength + 2; 321 } 322 CHECK_EQ(info_bytes_remaining, 0u); 323#endif 324 325 StreamInfo info; 326 info.mType = streamType; 327 info.mPID = elementaryPID; 328 infos.push(info); 329 330 infoBytesRemaining -= 5 + ES_info_length; 331 } 332 333 CHECK_EQ(infoBytesRemaining, 0u); 334 MY_LOGV(" CRC = 0x%08x", br->getBits(32)); 335 336 bool PIDsChanged = false; 337 for (size_t i = 0; i < infos.size(); ++i) { 338 StreamInfo &info = infos.editItemAt(i); 339 340 ssize_t index = mStreams.indexOfKey(info.mPID); 341 342 if (index >= 0 && mStreams.editValueAt(index)->type() != info.mType) { 343 ALOGI("uh oh. stream PIDs have changed."); 344 PIDsChanged = true; 345 break; 346 } 347 } 348 349 if (PIDsChanged) { 350#if 0 351 ALOGI("before:"); 352 for (size_t i = 0; i < mStreams.size(); ++i) { 353 sp<Stream> stream = mStreams.editValueAt(i); 354 355 ALOGI("PID 0x%08x => type 0x%02x", stream->pid(), stream->type()); 356 } 357 358 ALOGI("after:"); 359 for (size_t i = 0; i < infos.size(); ++i) { 360 StreamInfo &info = infos.editItemAt(i); 361 362 ALOGI("PID 0x%08x => type 0x%02x", info.mPID, info.mType); 363 } 364#endif 365 366 // The only case we can recover from is if we have two streams 367 // and they switched PIDs. 368 369 bool success = false; 370 371 if (mStreams.size() == 2 && infos.size() == 2) { 372 const StreamInfo &info1 = infos.itemAt(0); 373 const StreamInfo &info2 = infos.itemAt(1); 374 375 sp<Stream> s1 = mStreams.editValueAt(0); 376 sp<Stream> s2 = mStreams.editValueAt(1); 377 378 bool caseA = 379 info1.mPID == s1->pid() && info1.mType == s2->type() 380 && info2.mPID == s2->pid() && info2.mType == s1->type(); 381 382 bool caseB = 383 info1.mPID == s2->pid() && info1.mType == s1->type() 384 && info2.mPID == s1->pid() && info2.mType == s2->type(); 385 386 if (caseA || caseB) { 387 unsigned pid1 = s1->pid(); 388 unsigned pid2 = s2->pid(); 389 s1->setPID(pid2); 390 s2->setPID(pid1); 391 392 mStreams.clear(); 393 mStreams.add(s1->pid(), s1); 394 mStreams.add(s2->pid(), s2); 395 396 success = true; 397 } 398 } 399 400 if (!success) { 401 ALOGI("Stream PIDs changed and we cannot recover."); 402 return ERROR_MALFORMED; 403 } 404 } 405 406 for (size_t i = 0; i < infos.size(); ++i) { 407 StreamInfo &info = infos.editItemAt(i); 408 409 ssize_t index = mStreams.indexOfKey(info.mPID); 410 411 if (index < 0) { 412 sp<Stream> stream = new Stream( 413 this, info.mPID, info.mType, PCR_PID); 414 415 mStreams.add(info.mPID, stream); 416 } 417 } 418 419 return OK; 420} 421 422sp<MediaSource> ATSParser::Program::getSource(SourceType type) { 423 size_t index = (type == AUDIO) ? 0 : 0; 424 425 for (size_t i = 0; i < mStreams.size(); ++i) { 426 sp<MediaSource> source = mStreams.editValueAt(i)->getSource(type); 427 if (source != NULL) { 428 if (index == 0) { 429 return source; 430 } 431 --index; 432 } 433 } 434 435 return NULL; 436} 437 438int64_t ATSParser::Program::convertPTSToTimestamp(uint64_t PTS) { 439 if (!(mParser->mFlags & TS_TIMESTAMPS_ARE_ABSOLUTE)) { 440 if (!mFirstPTSValid) { 441 mFirstPTSValid = true; 442 mFirstPTS = PTS; 443 PTS = 0; 444 } else if (PTS < mFirstPTS) { 445 PTS = 0; 446 } else { 447 PTS -= mFirstPTS; 448 } 449 } 450 451 int64_t timeUs = (PTS * 100) / 9; 452 453 if (mParser->mAbsoluteTimeAnchorUs >= 0ll) { 454 timeUs += mParser->mAbsoluteTimeAnchorUs; 455 } 456 457 if (mParser->mTimeOffsetValid) { 458 timeUs += mParser->mTimeOffsetUs; 459 } 460 461 return timeUs; 462} 463 464//////////////////////////////////////////////////////////////////////////////// 465 466ATSParser::Stream::Stream( 467 Program *program, 468 unsigned elementaryPID, 469 unsigned streamType, 470 unsigned PCR_PID) 471 : mProgram(program), 472 mElementaryPID(elementaryPID), 473 mStreamType(streamType), 474 mPCR_PID(PCR_PID), 475 mExpectedContinuityCounter(-1), 476 mPayloadStarted(false), 477 mPrevPTS(0), 478 mQueue(NULL) { 479 switch (mStreamType) { 480 case STREAMTYPE_H264: 481 mQueue = new ElementaryStreamQueue( 482 ElementaryStreamQueue::H264, 483 (mProgram->parserFlags() & ALIGNED_VIDEO_DATA) 484 ? ElementaryStreamQueue::kFlag_AlignedData : 0); 485 break; 486 case STREAMTYPE_MPEG2_AUDIO_ADTS: 487 mQueue = new ElementaryStreamQueue(ElementaryStreamQueue::AAC); 488 break; 489 case STREAMTYPE_MPEG1_AUDIO: 490 case STREAMTYPE_MPEG2_AUDIO: 491 mQueue = new ElementaryStreamQueue( 492 ElementaryStreamQueue::MPEG_AUDIO); 493 break; 494 495 case STREAMTYPE_MPEG1_VIDEO: 496 case STREAMTYPE_MPEG2_VIDEO: 497 mQueue = new ElementaryStreamQueue( 498 ElementaryStreamQueue::MPEG_VIDEO); 499 break; 500 501 case STREAMTYPE_MPEG4_VIDEO: 502 mQueue = new ElementaryStreamQueue( 503 ElementaryStreamQueue::MPEG4_VIDEO); 504 break; 505 506 case STREAMTYPE_PCM_AUDIO: 507 mQueue = new ElementaryStreamQueue( 508 ElementaryStreamQueue::PCM_AUDIO); 509 break; 510 511 default: 512 break; 513 } 514 515 ALOGV("new stream PID 0x%02x, type 0x%02x", elementaryPID, streamType); 516 517 if (mQueue != NULL) { 518 mBuffer = new ABuffer(192 * 1024); 519 mBuffer->setRange(0, 0); 520 } 521} 522 523ATSParser::Stream::~Stream() { 524 delete mQueue; 525 mQueue = NULL; 526} 527 528status_t ATSParser::Stream::parse( 529 unsigned continuity_counter, 530 unsigned payload_unit_start_indicator, ABitReader *br) { 531 if (mQueue == NULL) { 532 return OK; 533 } 534 535 if (mExpectedContinuityCounter >= 0 536 && (unsigned)mExpectedContinuityCounter != continuity_counter) { 537 ALOGI("discontinuity on stream pid 0x%04x", mElementaryPID); 538 539 mPayloadStarted = false; 540 mBuffer->setRange(0, 0); 541 mExpectedContinuityCounter = -1; 542 543#if 0 544 // Uncomment this if you'd rather see no corruption whatsoever on 545 // screen and suspend updates until we come across another IDR frame. 546 547 if (mStreamType == STREAMTYPE_H264) { 548 ALOGI("clearing video queue"); 549 mQueue->clear(true /* clearFormat */); 550 } 551#endif 552 553 return OK; 554 } 555 556 mExpectedContinuityCounter = (continuity_counter + 1) & 0x0f; 557 558 if (payload_unit_start_indicator) { 559 if (mPayloadStarted) { 560 // Otherwise we run the danger of receiving the trailing bytes 561 // of a PES packet that we never saw the start of and assuming 562 // we have a a complete PES packet. 563 564 status_t err = flush(); 565 566 if (err != OK) { 567 return err; 568 } 569 } 570 571 mPayloadStarted = true; 572 } 573 574 if (!mPayloadStarted) { 575 return OK; 576 } 577 578 size_t payloadSizeBits = br->numBitsLeft(); 579 CHECK_EQ(payloadSizeBits % 8, 0u); 580 581 size_t neededSize = mBuffer->size() + payloadSizeBits / 8; 582 if (mBuffer->capacity() < neededSize) { 583 // Increment in multiples of 64K. 584 neededSize = (neededSize + 65535) & ~65535; 585 586 ALOGI("resizing buffer to %d bytes", neededSize); 587 588 sp<ABuffer> newBuffer = new ABuffer(neededSize); 589 memcpy(newBuffer->data(), mBuffer->data(), mBuffer->size()); 590 newBuffer->setRange(0, mBuffer->size()); 591 mBuffer = newBuffer; 592 } 593 594 memcpy(mBuffer->data() + mBuffer->size(), br->data(), payloadSizeBits / 8); 595 mBuffer->setRange(0, mBuffer->size() + payloadSizeBits / 8); 596 597 return OK; 598} 599 600bool ATSParser::Stream::isVideo() const { 601 switch (mStreamType) { 602 case STREAMTYPE_H264: 603 case STREAMTYPE_MPEG1_VIDEO: 604 case STREAMTYPE_MPEG2_VIDEO: 605 case STREAMTYPE_MPEG4_VIDEO: 606 return true; 607 608 default: 609 return false; 610 } 611} 612 613bool ATSParser::Stream::isAudio() const { 614 switch (mStreamType) { 615 case STREAMTYPE_MPEG1_AUDIO: 616 case STREAMTYPE_MPEG2_AUDIO: 617 case STREAMTYPE_MPEG2_AUDIO_ADTS: 618 case STREAMTYPE_PCM_AUDIO: 619 return true; 620 621 default: 622 return false; 623 } 624} 625 626void ATSParser::Stream::signalDiscontinuity( 627 DiscontinuityType type, const sp<AMessage> &extra) { 628 mExpectedContinuityCounter = -1; 629 630 if (mQueue == NULL) { 631 return; 632 } 633 634 mPayloadStarted = false; 635 mBuffer->setRange(0, 0); 636 637 bool clearFormat = false; 638 if (isAudio()) { 639 if (type & DISCONTINUITY_AUDIO_FORMAT) { 640 clearFormat = true; 641 } 642 } else { 643 if (type & DISCONTINUITY_VIDEO_FORMAT) { 644 clearFormat = true; 645 } 646 } 647 648 mQueue->clear(clearFormat); 649 650 if (type & DISCONTINUITY_TIME) { 651 uint64_t resumeAtPTS; 652 if (extra != NULL 653 && extra->findInt64( 654 IStreamListener::kKeyResumeAtPTS, 655 (int64_t *)&resumeAtPTS)) { 656 int64_t resumeAtMediaTimeUs = 657 mProgram->convertPTSToTimestamp(resumeAtPTS); 658 659 extra->setInt64("resume-at-mediatimeUs", resumeAtMediaTimeUs); 660 } 661 } 662 663 if (mSource != NULL) { 664 mSource->queueDiscontinuity(type, extra); 665 } 666} 667 668void ATSParser::Stream::signalEOS(status_t finalResult) { 669 if (mSource != NULL) { 670 mSource->signalEOS(finalResult); 671 } 672} 673 674status_t ATSParser::Stream::parsePES(ABitReader *br) { 675 unsigned packet_startcode_prefix = br->getBits(24); 676 677 ALOGV("packet_startcode_prefix = 0x%08x", packet_startcode_prefix); 678 679 if (packet_startcode_prefix != 1) { 680 ALOGV("Supposedly payload_unit_start=1 unit does not start " 681 "with startcode."); 682 683 return ERROR_MALFORMED; 684 } 685 686 CHECK_EQ(packet_startcode_prefix, 0x000001u); 687 688 unsigned stream_id = br->getBits(8); 689 ALOGV("stream_id = 0x%02x", stream_id); 690 691 unsigned PES_packet_length = br->getBits(16); 692 ALOGV("PES_packet_length = %u", PES_packet_length); 693 694 if (stream_id != 0xbc // program_stream_map 695 && stream_id != 0xbe // padding_stream 696 && stream_id != 0xbf // private_stream_2 697 && stream_id != 0xf0 // ECM 698 && stream_id != 0xf1 // EMM 699 && stream_id != 0xff // program_stream_directory 700 && stream_id != 0xf2 // DSMCC 701 && stream_id != 0xf8) { // H.222.1 type E 702 CHECK_EQ(br->getBits(2), 2u); 703 704 MY_LOGV("PES_scrambling_control = %u", br->getBits(2)); 705 MY_LOGV("PES_priority = %u", br->getBits(1)); 706 MY_LOGV("data_alignment_indicator = %u", br->getBits(1)); 707 MY_LOGV("copyright = %u", br->getBits(1)); 708 MY_LOGV("original_or_copy = %u", br->getBits(1)); 709 710 unsigned PTS_DTS_flags = br->getBits(2); 711 ALOGV("PTS_DTS_flags = %u", PTS_DTS_flags); 712 713 unsigned ESCR_flag = br->getBits(1); 714 ALOGV("ESCR_flag = %u", ESCR_flag); 715 716 unsigned ES_rate_flag = br->getBits(1); 717 ALOGV("ES_rate_flag = %u", ES_rate_flag); 718 719 unsigned DSM_trick_mode_flag = br->getBits(1); 720 ALOGV("DSM_trick_mode_flag = %u", DSM_trick_mode_flag); 721 722 unsigned additional_copy_info_flag = br->getBits(1); 723 ALOGV("additional_copy_info_flag = %u", additional_copy_info_flag); 724 725 MY_LOGV("PES_CRC_flag = %u", br->getBits(1)); 726 MY_LOGV("PES_extension_flag = %u", br->getBits(1)); 727 728 unsigned PES_header_data_length = br->getBits(8); 729 ALOGV("PES_header_data_length = %u", PES_header_data_length); 730 731 unsigned optional_bytes_remaining = PES_header_data_length; 732 733 uint64_t PTS = 0, DTS = 0; 734 735 if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) { 736 CHECK_GE(optional_bytes_remaining, 5u); 737 738 CHECK_EQ(br->getBits(4), PTS_DTS_flags); 739 740 PTS = ((uint64_t)br->getBits(3)) << 30; 741 CHECK_EQ(br->getBits(1), 1u); 742 PTS |= ((uint64_t)br->getBits(15)) << 15; 743 CHECK_EQ(br->getBits(1), 1u); 744 PTS |= br->getBits(15); 745 CHECK_EQ(br->getBits(1), 1u); 746 747 ALOGV("PTS = 0x%016llx (%.2f)", PTS, PTS / 90000.0); 748 749 optional_bytes_remaining -= 5; 750 751 if (PTS_DTS_flags == 3) { 752 CHECK_GE(optional_bytes_remaining, 5u); 753 754 CHECK_EQ(br->getBits(4), 1u); 755 756 DTS = ((uint64_t)br->getBits(3)) << 30; 757 CHECK_EQ(br->getBits(1), 1u); 758 DTS |= ((uint64_t)br->getBits(15)) << 15; 759 CHECK_EQ(br->getBits(1), 1u); 760 DTS |= br->getBits(15); 761 CHECK_EQ(br->getBits(1), 1u); 762 763 ALOGV("DTS = %llu", DTS); 764 765 optional_bytes_remaining -= 5; 766 } 767 } 768 769 if (ESCR_flag) { 770 CHECK_GE(optional_bytes_remaining, 6u); 771 772 br->getBits(2); 773 774 uint64_t ESCR = ((uint64_t)br->getBits(3)) << 30; 775 CHECK_EQ(br->getBits(1), 1u); 776 ESCR |= ((uint64_t)br->getBits(15)) << 15; 777 CHECK_EQ(br->getBits(1), 1u); 778 ESCR |= br->getBits(15); 779 CHECK_EQ(br->getBits(1), 1u); 780 781 ALOGV("ESCR = %llu", ESCR); 782 MY_LOGV("ESCR_extension = %u", br->getBits(9)); 783 784 CHECK_EQ(br->getBits(1), 1u); 785 786 optional_bytes_remaining -= 6; 787 } 788 789 if (ES_rate_flag) { 790 CHECK_GE(optional_bytes_remaining, 3u); 791 792 CHECK_EQ(br->getBits(1), 1u); 793 MY_LOGV("ES_rate = %u", br->getBits(22)); 794 CHECK_EQ(br->getBits(1), 1u); 795 796 optional_bytes_remaining -= 3; 797 } 798 799 br->skipBits(optional_bytes_remaining * 8); 800 801 // ES data follows. 802 803 if (PES_packet_length != 0) { 804 CHECK_GE(PES_packet_length, PES_header_data_length + 3); 805 806 unsigned dataLength = 807 PES_packet_length - 3 - PES_header_data_length; 808 809 if (br->numBitsLeft() < dataLength * 8) { 810 ALOGE("PES packet does not carry enough data to contain " 811 "payload. (numBitsLeft = %d, required = %d)", 812 br->numBitsLeft(), dataLength * 8); 813 814 return ERROR_MALFORMED; 815 } 816 817 CHECK_GE(br->numBitsLeft(), dataLength * 8); 818 819 onPayloadData( 820 PTS_DTS_flags, PTS, DTS, br->data(), dataLength); 821 822 br->skipBits(dataLength * 8); 823 } else { 824 onPayloadData( 825 PTS_DTS_flags, PTS, DTS, 826 br->data(), br->numBitsLeft() / 8); 827 828 size_t payloadSizeBits = br->numBitsLeft(); 829 CHECK_EQ(payloadSizeBits % 8, 0u); 830 831 ALOGV("There's %d bytes of payload.", payloadSizeBits / 8); 832 } 833 } else if (stream_id == 0xbe) { // padding_stream 834 CHECK_NE(PES_packet_length, 0u); 835 br->skipBits(PES_packet_length * 8); 836 } else { 837 CHECK_NE(PES_packet_length, 0u); 838 br->skipBits(PES_packet_length * 8); 839 } 840 841 return OK; 842} 843 844status_t ATSParser::Stream::flush() { 845 if (mBuffer->size() == 0) { 846 return OK; 847 } 848 849 ALOGV("flushing stream 0x%04x size = %d", mElementaryPID, mBuffer->size()); 850 851 ABitReader br(mBuffer->data(), mBuffer->size()); 852 853 status_t err = parsePES(&br); 854 855 mBuffer->setRange(0, 0); 856 857 return err; 858} 859 860void ATSParser::Stream::onPayloadData( 861 unsigned PTS_DTS_flags, uint64_t PTS, uint64_t /* DTS */, 862 const uint8_t *data, size_t size) { 863#if 0 864 ALOGI("payload streamType 0x%02x, PTS = 0x%016llx, dPTS = %lld", 865 mStreamType, 866 PTS, 867 (int64_t)PTS - mPrevPTS); 868 mPrevPTS = PTS; 869#endif 870 871 ALOGV("onPayloadData mStreamType=0x%02x", mStreamType); 872 873 int64_t timeUs = 0ll; // no presentation timestamp available. 874 if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) { 875 timeUs = mProgram->convertPTSToTimestamp(PTS); 876 } 877 878 status_t err = mQueue->appendData(data, size, timeUs); 879 880 if (err != OK) { 881 return; 882 } 883 884 sp<ABuffer> accessUnit; 885 while ((accessUnit = mQueue->dequeueAccessUnit()) != NULL) { 886 if (mSource == NULL) { 887 sp<MetaData> meta = mQueue->getFormat(); 888 889 if (meta != NULL) { 890 ALOGV("Stream PID 0x%08x of type 0x%02x now has data.", 891 mElementaryPID, mStreamType); 892 893 mSource = new AnotherPacketSource(meta); 894 mSource->queueAccessUnit(accessUnit); 895 } 896 } else if (mQueue->getFormat() != NULL) { 897 // After a discontinuity we invalidate the queue's format 898 // and won't enqueue any access units to the source until 899 // the queue has reestablished the new format. 900 901 if (mSource->getFormat() == NULL) { 902 mSource->setFormat(mQueue->getFormat()); 903 } 904 mSource->queueAccessUnit(accessUnit); 905 } 906 } 907} 908 909sp<MediaSource> ATSParser::Stream::getSource(SourceType type) { 910 switch (type) { 911 case VIDEO: 912 { 913 if (isVideo()) { 914 return mSource; 915 } 916 break; 917 } 918 919 case AUDIO: 920 { 921 if (isAudio()) { 922 return mSource; 923 } 924 break; 925 } 926 927 default: 928 break; 929 } 930 931 return NULL; 932} 933 934//////////////////////////////////////////////////////////////////////////////// 935 936ATSParser::ATSParser(uint32_t flags) 937 : mFlags(flags), 938 mAbsoluteTimeAnchorUs(-1ll), 939 mTimeOffsetValid(false), 940 mTimeOffsetUs(0ll), 941 mNumTSPacketsParsed(0), 942 mNumPCRs(0) { 943 mPSISections.add(0 /* PID */, new PSISection); 944} 945 946ATSParser::~ATSParser() { 947} 948 949status_t ATSParser::feedTSPacket(const void *data, size_t size) { 950 CHECK_EQ(size, kTSPacketSize); 951 952 ABitReader br((const uint8_t *)data, kTSPacketSize); 953 return parseTS(&br); 954} 955 956void ATSParser::signalDiscontinuity( 957 DiscontinuityType type, const sp<AMessage> &extra) { 958 int64_t mediaTimeUs; 959 if ((type & DISCONTINUITY_TIME) 960 && extra != NULL 961 && extra->findInt64( 962 IStreamListener::kKeyMediaTimeUs, &mediaTimeUs)) { 963 mAbsoluteTimeAnchorUs = mediaTimeUs; 964 } else if (type == DISCONTINUITY_ABSOLUTE_TIME) { 965 int64_t timeUs; 966 CHECK(extra->findInt64("timeUs", &timeUs)); 967 968 CHECK(mPrograms.empty()); 969 mAbsoluteTimeAnchorUs = timeUs; 970 return; 971 } else if (type == DISCONTINUITY_TIME_OFFSET) { 972 int64_t offset; 973 CHECK(extra->findInt64("offset", &offset)); 974 975 mTimeOffsetValid = true; 976 mTimeOffsetUs = offset; 977 return; 978 } 979 980 for (size_t i = 0; i < mPrograms.size(); ++i) { 981 mPrograms.editItemAt(i)->signalDiscontinuity(type, extra); 982 } 983} 984 985void ATSParser::signalEOS(status_t finalResult) { 986 CHECK_NE(finalResult, (status_t)OK); 987 988 for (size_t i = 0; i < mPrograms.size(); ++i) { 989 mPrograms.editItemAt(i)->signalEOS(finalResult); 990 } 991} 992 993void ATSParser::parseProgramAssociationTable(ABitReader *br) { 994 unsigned table_id = br->getBits(8); 995 ALOGV(" table_id = %u", table_id); 996 CHECK_EQ(table_id, 0x00u); 997 998 unsigned section_syntax_indictor = br->getBits(1); 999 ALOGV(" section_syntax_indictor = %u", section_syntax_indictor); 1000 CHECK_EQ(section_syntax_indictor, 1u); 1001 1002 CHECK_EQ(br->getBits(1), 0u); 1003 MY_LOGV(" reserved = %u", br->getBits(2)); 1004 1005 unsigned section_length = br->getBits(12); 1006 ALOGV(" section_length = %u", section_length); 1007 CHECK_EQ(section_length & 0xc00, 0u); 1008 1009 MY_LOGV(" transport_stream_id = %u", br->getBits(16)); 1010 MY_LOGV(" reserved = %u", br->getBits(2)); 1011 MY_LOGV(" version_number = %u", br->getBits(5)); 1012 MY_LOGV(" current_next_indicator = %u", br->getBits(1)); 1013 MY_LOGV(" section_number = %u", br->getBits(8)); 1014 MY_LOGV(" last_section_number = %u", br->getBits(8)); 1015 1016 size_t numProgramBytes = (section_length - 5 /* header */ - 4 /* crc */); 1017 CHECK_EQ((numProgramBytes % 4), 0u); 1018 1019 for (size_t i = 0; i < numProgramBytes / 4; ++i) { 1020 unsigned program_number = br->getBits(16); 1021 ALOGV(" program_number = %u", program_number); 1022 1023 MY_LOGV(" reserved = %u", br->getBits(3)); 1024 1025 if (program_number == 0) { 1026 MY_LOGV(" network_PID = 0x%04x", br->getBits(13)); 1027 } else { 1028 unsigned programMapPID = br->getBits(13); 1029 1030 ALOGV(" program_map_PID = 0x%04x", programMapPID); 1031 1032 bool found = false; 1033 for (size_t index = 0; index < mPrograms.size(); ++index) { 1034 const sp<Program> &program = mPrograms.itemAt(index); 1035 1036 if (program->number() == program_number) { 1037 program->updateProgramMapPID(programMapPID); 1038 found = true; 1039 break; 1040 } 1041 } 1042 1043 if (!found) { 1044 mPrograms.push( 1045 new Program(this, program_number, programMapPID)); 1046 } 1047 1048 if (mPSISections.indexOfKey(programMapPID) < 0) { 1049 mPSISections.add(programMapPID, new PSISection); 1050 } 1051 } 1052 } 1053 1054 MY_LOGV(" CRC = 0x%08x", br->getBits(32)); 1055} 1056 1057status_t ATSParser::parsePID( 1058 ABitReader *br, unsigned PID, 1059 unsigned continuity_counter, 1060 unsigned payload_unit_start_indicator) { 1061 ssize_t sectionIndex = mPSISections.indexOfKey(PID); 1062 1063 if (sectionIndex >= 0) { 1064 sp<PSISection> section = mPSISections.valueAt(sectionIndex); 1065 1066 if (payload_unit_start_indicator) { 1067 CHECK(section->isEmpty()); 1068 1069 unsigned skip = br->getBits(8); 1070 br->skipBits(skip * 8); 1071 } 1072 1073 CHECK((br->numBitsLeft() % 8) == 0); 1074 status_t err = section->append(br->data(), br->numBitsLeft() / 8); 1075 1076 if (err != OK) { 1077 return err; 1078 } 1079 1080 if (!section->isComplete()) { 1081 return OK; 1082 } 1083 1084 ABitReader sectionBits(section->data(), section->size()); 1085 1086 if (PID == 0) { 1087 parseProgramAssociationTable(§ionBits); 1088 } else { 1089 bool handled = false; 1090 for (size_t i = 0; i < mPrograms.size(); ++i) { 1091 status_t err; 1092 if (!mPrograms.editItemAt(i)->parsePSISection( 1093 PID, §ionBits, &err)) { 1094 continue; 1095 } 1096 1097 if (err != OK) { 1098 return err; 1099 } 1100 1101 handled = true; 1102 break; 1103 } 1104 1105 if (!handled) { 1106 mPSISections.removeItem(PID); 1107 section.clear(); 1108 } 1109 } 1110 1111 if (section != NULL) { 1112 section->clear(); 1113 } 1114 1115 return OK; 1116 } 1117 1118 bool handled = false; 1119 for (size_t i = 0; i < mPrograms.size(); ++i) { 1120 status_t err; 1121 if (mPrograms.editItemAt(i)->parsePID( 1122 PID, continuity_counter, payload_unit_start_indicator, 1123 br, &err)) { 1124 if (err != OK) { 1125 return err; 1126 } 1127 1128 handled = true; 1129 break; 1130 } 1131 } 1132 1133 if (!handled) { 1134 ALOGV("PID 0x%04x not handled.", PID); 1135 } 1136 1137 return OK; 1138} 1139 1140void ATSParser::parseAdaptationField(ABitReader *br, unsigned PID) { 1141 unsigned adaptation_field_length = br->getBits(8); 1142 1143 if (adaptation_field_length > 0) { 1144 unsigned discontinuity_indicator = br->getBits(1); 1145 1146 if (discontinuity_indicator) { 1147 ALOGV("PID 0x%04x: discontinuity_indicator = 1 (!!!)", PID); 1148 } 1149 1150 br->skipBits(2); 1151 unsigned PCR_flag = br->getBits(1); 1152 1153 size_t numBitsRead = 4; 1154 1155 if (PCR_flag) { 1156 br->skipBits(4); 1157 uint64_t PCR_base = br->getBits(32); 1158 PCR_base = (PCR_base << 1) | br->getBits(1); 1159 1160 br->skipBits(6); 1161 unsigned PCR_ext = br->getBits(9); 1162 1163 // The number of bytes from the start of the current 1164 // MPEG2 transport stream packet up and including 1165 // the final byte of this PCR_ext field. 1166 size_t byteOffsetFromStartOfTSPacket = 1167 (188 - br->numBitsLeft() / 8); 1168 1169 uint64_t PCR = PCR_base * 300 + PCR_ext; 1170 1171 ALOGV("PID 0x%04x: PCR = 0x%016llx (%.2f)", 1172 PID, PCR, PCR / 27E6); 1173 1174 // The number of bytes received by this parser up to and 1175 // including the final byte of this PCR_ext field. 1176 size_t byteOffsetFromStart = 1177 mNumTSPacketsParsed * 188 + byteOffsetFromStartOfTSPacket; 1178 1179 for (size_t i = 0; i < mPrograms.size(); ++i) { 1180 updatePCR(PID, PCR, byteOffsetFromStart); 1181 } 1182 1183 numBitsRead += 52; 1184 } 1185 1186 CHECK_GE(adaptation_field_length * 8, numBitsRead); 1187 1188 br->skipBits(adaptation_field_length * 8 - numBitsRead); 1189 } 1190} 1191 1192status_t ATSParser::parseTS(ABitReader *br) { 1193 ALOGV("---"); 1194 1195 unsigned sync_byte = br->getBits(8); 1196 CHECK_EQ(sync_byte, 0x47u); 1197 1198 if (br->getBits(1)) { // transport_error_indicator 1199 // silently ignore. 1200 return OK; 1201 } 1202 1203 unsigned payload_unit_start_indicator = br->getBits(1); 1204 ALOGV("payload_unit_start_indicator = %u", payload_unit_start_indicator); 1205 1206 MY_LOGV("transport_priority = %u", br->getBits(1)); 1207 1208 unsigned PID = br->getBits(13); 1209 ALOGV("PID = 0x%04x", PID); 1210 1211 MY_LOGV("transport_scrambling_control = %u", br->getBits(2)); 1212 1213 unsigned adaptation_field_control = br->getBits(2); 1214 ALOGV("adaptation_field_control = %u", adaptation_field_control); 1215 1216 unsigned continuity_counter = br->getBits(4); 1217 ALOGV("PID = 0x%04x, continuity_counter = %u", PID, continuity_counter); 1218 1219 // ALOGI("PID = 0x%04x, continuity_counter = %u", PID, continuity_counter); 1220 1221 if (adaptation_field_control == 2 || adaptation_field_control == 3) { 1222 parseAdaptationField(br, PID); 1223 } 1224 1225 status_t err = OK; 1226 1227 if (adaptation_field_control == 1 || adaptation_field_control == 3) { 1228 err = parsePID( 1229 br, PID, continuity_counter, payload_unit_start_indicator); 1230 } 1231 1232 ++mNumTSPacketsParsed; 1233 1234 return err; 1235} 1236 1237sp<MediaSource> ATSParser::getSource(SourceType type) { 1238 int which = -1; // any 1239 1240 for (size_t i = 0; i < mPrograms.size(); ++i) { 1241 const sp<Program> &program = mPrograms.editItemAt(i); 1242 1243 if (which >= 0 && (int)program->number() != which) { 1244 continue; 1245 } 1246 1247 sp<MediaSource> source = program->getSource(type); 1248 1249 if (source != NULL) { 1250 return source; 1251 } 1252 } 1253 1254 return NULL; 1255} 1256 1257bool ATSParser::PTSTimeDeltaEstablished() { 1258 if (mPrograms.isEmpty()) { 1259 return false; 1260 } 1261 1262 return mPrograms.editItemAt(0)->PTSTimeDeltaEstablished(); 1263} 1264 1265void ATSParser::updatePCR( 1266 unsigned /* PID */, uint64_t PCR, size_t byteOffsetFromStart) { 1267 ALOGV("PCR 0x%016" PRIx64 " @ %zu", PCR, byteOffsetFromStart); 1268 1269 if (mNumPCRs == 2) { 1270 mPCR[0] = mPCR[1]; 1271 mPCRBytes[0] = mPCRBytes[1]; 1272 mSystemTimeUs[0] = mSystemTimeUs[1]; 1273 mNumPCRs = 1; 1274 } 1275 1276 mPCR[mNumPCRs] = PCR; 1277 mPCRBytes[mNumPCRs] = byteOffsetFromStart; 1278 mSystemTimeUs[mNumPCRs] = ALooper::GetNowUs(); 1279 1280 ++mNumPCRs; 1281 1282 if (mNumPCRs == 2) { 1283 double transportRate = 1284 (mPCRBytes[1] - mPCRBytes[0]) * 27E6 / (mPCR[1] - mPCR[0]); 1285 1286 ALOGV("transportRate = %.2f bytes/sec", transportRate); 1287 } 1288} 1289 1290//////////////////////////////////////////////////////////////////////////////// 1291 1292ATSParser::PSISection::PSISection() { 1293} 1294 1295ATSParser::PSISection::~PSISection() { 1296} 1297 1298status_t ATSParser::PSISection::append(const void *data, size_t size) { 1299 if (mBuffer == NULL || mBuffer->size() + size > mBuffer->capacity()) { 1300 size_t newCapacity = 1301 (mBuffer == NULL) ? size : mBuffer->capacity() + size; 1302 1303 newCapacity = (newCapacity + 1023) & ~1023; 1304 1305 sp<ABuffer> newBuffer = new ABuffer(newCapacity); 1306 1307 if (mBuffer != NULL) { 1308 memcpy(newBuffer->data(), mBuffer->data(), mBuffer->size()); 1309 newBuffer->setRange(0, mBuffer->size()); 1310 } else { 1311 newBuffer->setRange(0, 0); 1312 } 1313 1314 mBuffer = newBuffer; 1315 } 1316 1317 memcpy(mBuffer->data() + mBuffer->size(), data, size); 1318 mBuffer->setRange(0, mBuffer->size() + size); 1319 1320 return OK; 1321} 1322 1323void ATSParser::PSISection::clear() { 1324 if (mBuffer != NULL) { 1325 mBuffer->setRange(0, 0); 1326 } 1327} 1328 1329bool ATSParser::PSISection::isComplete() const { 1330 if (mBuffer == NULL || mBuffer->size() < 3) { 1331 return false; 1332 } 1333 1334 unsigned sectionLength = U16_AT(mBuffer->data() + 1) & 0xfff; 1335 return mBuffer->size() >= sectionLength + 3; 1336} 1337 1338bool ATSParser::PSISection::isEmpty() const { 1339 return mBuffer == NULL || mBuffer->size() == 0; 1340} 1341 1342const uint8_t *ATSParser::PSISection::data() const { 1343 return mBuffer == NULL ? NULL : mBuffer->data(); 1344} 1345 1346size_t ATSParser::PSISection::size() const { 1347 return mBuffer == NULL ? 0 : mBuffer->size(); 1348} 1349 1350} // namespace android 1351