ATSParser.cpp revision 06528d7f18ad01377357d337eaa3e875a242bd2d
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/IStreamSource.h> 36#include <utils/KeyedVector.h> 37 38namespace android { 39 40// I want the expression "y" evaluated even if verbose logging is off. 41#define MY_LOGV(x, y) \ 42 do { unsigned tmp = y; LOGV(x, tmp); } while (0) 43 44static const size_t kTSPacketSize = 188; 45 46struct ATSParser::Program : public RefBase { 47 Program(ATSParser *parser, unsigned programNumber, unsigned programMapPID); 48 49 bool parsePID( 50 unsigned pid, unsigned payload_unit_start_indicator, 51 ABitReader *br, status_t *err); 52 53 void signalDiscontinuity( 54 DiscontinuityType type, const sp<AMessage> &extra); 55 56 void signalEOS(status_t finalResult); 57 58 sp<MediaSource> getSource(SourceType type); 59 60 int64_t convertPTSToTimestamp(uint64_t PTS); 61 62 bool PTSTimeDeltaEstablished() const { 63 return mFirstPTSValid; 64 } 65 66 unsigned number() const { return mProgramNumber; } 67 68 void updateProgramMapPID(unsigned programMapPID) { 69 mProgramMapPID = programMapPID; 70 } 71 72private: 73 ATSParser *mParser; 74 unsigned mProgramNumber; 75 unsigned mProgramMapPID; 76 KeyedVector<unsigned, sp<Stream> > mStreams; 77 bool mFirstPTSValid; 78 uint64_t mFirstPTS; 79 80 status_t parseProgramMap(ABitReader *br); 81 82 DISALLOW_EVIL_CONSTRUCTORS(Program); 83}; 84 85struct ATSParser::Stream : public RefBase { 86 Stream(Program *program, unsigned elementaryPID, unsigned streamType); 87 88 unsigned type() const { return mStreamType; } 89 unsigned pid() const { return mElementaryPID; } 90 void setPID(unsigned pid) { mElementaryPID = pid; } 91 92 void parse( 93 unsigned payload_unit_start_indicator, 94 ABitReader *br); 95 96 void signalDiscontinuity( 97 DiscontinuityType type, const sp<AMessage> &extra); 98 99 void signalEOS(status_t finalResult); 100 101 sp<MediaSource> getSource(SourceType type); 102 103protected: 104 virtual ~Stream(); 105 106private: 107 Program *mProgram; 108 unsigned mElementaryPID; 109 unsigned mStreamType; 110 111 sp<ABuffer> mBuffer; 112 sp<AnotherPacketSource> mSource; 113 bool mPayloadStarted; 114 115 ElementaryStreamQueue *mQueue; 116 117 void flush(); 118 void parsePES(ABitReader *br); 119 120 void onPayloadData( 121 unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS, 122 const uint8_t *data, size_t size); 123 124 void extractAACFrames(const sp<ABuffer> &buffer); 125 126 DISALLOW_EVIL_CONSTRUCTORS(Stream); 127}; 128 129//////////////////////////////////////////////////////////////////////////////// 130 131ATSParser::Program::Program( 132 ATSParser *parser, unsigned programNumber, unsigned programMapPID) 133 : mParser(parser), 134 mProgramNumber(programNumber), 135 mProgramMapPID(programMapPID), 136 mFirstPTSValid(false), 137 mFirstPTS(0) { 138 LOGV("new program number %u", programNumber); 139} 140 141bool ATSParser::Program::parsePID( 142 unsigned pid, unsigned payload_unit_start_indicator, 143 ABitReader *br, status_t *err) { 144 *err = OK; 145 146 if (pid == mProgramMapPID) { 147 if (payload_unit_start_indicator) { 148 unsigned skip = br->getBits(8); 149 br->skipBits(skip * 8); 150 } 151 152 *err = parseProgramMap(br); 153 154 return true; 155 } 156 157 ssize_t index = mStreams.indexOfKey(pid); 158 if (index < 0) { 159 return false; 160 } 161 162 mStreams.editValueAt(index)->parse( 163 payload_unit_start_indicator, br); 164 165 return true; 166} 167 168void ATSParser::Program::signalDiscontinuity( 169 DiscontinuityType type, const sp<AMessage> &extra) { 170 for (size_t i = 0; i < mStreams.size(); ++i) { 171 mStreams.editValueAt(i)->signalDiscontinuity(type, extra); 172 } 173} 174 175void ATSParser::Program::signalEOS(status_t finalResult) { 176 for (size_t i = 0; i < mStreams.size(); ++i) { 177 mStreams.editValueAt(i)->signalEOS(finalResult); 178 } 179} 180 181struct StreamInfo { 182 unsigned mType; 183 unsigned mPID; 184}; 185 186status_t ATSParser::Program::parseProgramMap(ABitReader *br) { 187 unsigned table_id = br->getBits(8); 188 LOGV(" table_id = %u", table_id); 189 CHECK_EQ(table_id, 0x02u); 190 191 unsigned section_syntax_indicator = br->getBits(1); 192 LOGV(" section_syntax_indicator = %u", section_syntax_indicator); 193 CHECK_EQ(section_syntax_indicator, 1u); 194 195 CHECK_EQ(br->getBits(1), 0u); 196 MY_LOGV(" reserved = %u", br->getBits(2)); 197 198 unsigned section_length = br->getBits(12); 199 LOGV(" section_length = %u", section_length); 200 CHECK_EQ(section_length & 0xc00, 0u); 201 CHECK_LE(section_length, 1021u); 202 203 MY_LOGV(" program_number = %u", br->getBits(16)); 204 MY_LOGV(" reserved = %u", br->getBits(2)); 205 MY_LOGV(" version_number = %u", br->getBits(5)); 206 MY_LOGV(" current_next_indicator = %u", br->getBits(1)); 207 MY_LOGV(" section_number = %u", br->getBits(8)); 208 MY_LOGV(" last_section_number = %u", br->getBits(8)); 209 MY_LOGV(" reserved = %u", br->getBits(3)); 210 MY_LOGV(" PCR_PID = 0x%04x", br->getBits(13)); 211 MY_LOGV(" reserved = %u", br->getBits(4)); 212 213 unsigned program_info_length = br->getBits(12); 214 LOGV(" program_info_length = %u", program_info_length); 215 CHECK_EQ(program_info_length & 0xc00, 0u); 216 217 br->skipBits(program_info_length * 8); // skip descriptors 218 219 Vector<StreamInfo> infos; 220 221 // infoBytesRemaining is the number of bytes that make up the 222 // variable length section of ES_infos. It does not include the 223 // final CRC. 224 size_t infoBytesRemaining = section_length - 9 - program_info_length - 4; 225 226 while (infoBytesRemaining > 0) { 227 CHECK_GE(infoBytesRemaining, 5u); 228 229 unsigned streamType = br->getBits(8); 230 LOGV(" stream_type = 0x%02x", streamType); 231 232 MY_LOGV(" reserved = %u", br->getBits(3)); 233 234 unsigned elementaryPID = br->getBits(13); 235 LOGV(" elementary_PID = 0x%04x", elementaryPID); 236 237 MY_LOGV(" reserved = %u", br->getBits(4)); 238 239 unsigned ES_info_length = br->getBits(12); 240 LOGV(" ES_info_length = %u", ES_info_length); 241 CHECK_EQ(ES_info_length & 0xc00, 0u); 242 243 CHECK_GE(infoBytesRemaining - 5, ES_info_length); 244 245#if 0 246 br->skipBits(ES_info_length * 8); // skip descriptors 247#else 248 unsigned info_bytes_remaining = ES_info_length; 249 while (info_bytes_remaining >= 2) { 250 MY_LOGV(" tag = 0x%02x", br->getBits(8)); 251 252 unsigned descLength = br->getBits(8); 253 LOGV(" len = %u", descLength); 254 255 CHECK_GE(info_bytes_remaining, 2 + descLength); 256 257 br->skipBits(descLength * 8); 258 259 info_bytes_remaining -= descLength + 2; 260 } 261 CHECK_EQ(info_bytes_remaining, 0u); 262#endif 263 264 StreamInfo info; 265 info.mType = streamType; 266 info.mPID = elementaryPID; 267 infos.push(info); 268 269 infoBytesRemaining -= 5 + ES_info_length; 270 } 271 272 CHECK_EQ(infoBytesRemaining, 0u); 273 MY_LOGV(" CRC = 0x%08x", br->getBits(32)); 274 275 bool PIDsChanged = false; 276 for (size_t i = 0; i < infos.size(); ++i) { 277 StreamInfo &info = infos.editItemAt(i); 278 279 ssize_t index = mStreams.indexOfKey(info.mPID); 280 281 if (index >= 0 && mStreams.editValueAt(index)->type() != info.mType) { 282 LOGI("uh oh. stream PIDs have changed."); 283 PIDsChanged = true; 284 break; 285 } 286 } 287 288 if (PIDsChanged) { 289#if 0 290 LOGI("before:"); 291 for (size_t i = 0; i < mStreams.size(); ++i) { 292 sp<Stream> stream = mStreams.editValueAt(i); 293 294 LOGI("PID 0x%08x => type 0x%02x", stream->pid(), stream->type()); 295 } 296 297 LOGI("after:"); 298 for (size_t i = 0; i < infos.size(); ++i) { 299 StreamInfo &info = infos.editItemAt(i); 300 301 LOGI("PID 0x%08x => type 0x%02x", info.mPID, info.mType); 302 } 303#endif 304 305 // The only case we can recover from is if we have two streams 306 // and they switched PIDs. 307 308 bool success = false; 309 310 if (mStreams.size() == 2 && infos.size() == 2) { 311 const StreamInfo &info1 = infos.itemAt(0); 312 const StreamInfo &info2 = infos.itemAt(1); 313 314 sp<Stream> s1 = mStreams.editValueAt(0); 315 sp<Stream> s2 = mStreams.editValueAt(1); 316 317 bool caseA = 318 info1.mPID == s1->pid() && info1.mType == s2->type() 319 && info2.mPID == s2->pid() && info2.mType == s1->type(); 320 321 bool caseB = 322 info1.mPID == s2->pid() && info1.mType == s1->type() 323 && info2.mPID == s1->pid() && info2.mType == s2->type(); 324 325 if (caseA || caseB) { 326 unsigned pid1 = s1->pid(); 327 unsigned pid2 = s2->pid(); 328 s1->setPID(pid2); 329 s2->setPID(pid1); 330 331 mStreams.clear(); 332 mStreams.add(s1->pid(), s1); 333 mStreams.add(s2->pid(), s2); 334 335 success = true; 336 } 337 } 338 339 if (!success) { 340 LOGI("Stream PIDs changed and we cannot recover."); 341 return ERROR_MALFORMED; 342 } 343 } 344 345 for (size_t i = 0; i < infos.size(); ++i) { 346 StreamInfo &info = infos.editItemAt(i); 347 348 ssize_t index = mStreams.indexOfKey(info.mPID); 349 350 if (index < 0) { 351 sp<Stream> stream = new Stream(this, info.mPID, info.mType); 352 mStreams.add(info.mPID, stream); 353 } 354 } 355 356 return OK; 357} 358 359sp<MediaSource> ATSParser::Program::getSource(SourceType type) { 360 size_t index = (type == AUDIO) ? 0 : 0; 361 362 for (size_t i = 0; i < mStreams.size(); ++i) { 363 sp<MediaSource> source = mStreams.editValueAt(i)->getSource(type); 364 if (source != NULL) { 365 if (index == 0) { 366 return source; 367 } 368 --index; 369 } 370 } 371 372 return NULL; 373} 374 375int64_t ATSParser::Program::convertPTSToTimestamp(uint64_t PTS) { 376 if (!(mParser->mFlags & TS_TIMESTAMPS_ARE_ABSOLUTE)) { 377 if (!mFirstPTSValid) { 378 mFirstPTSValid = true; 379 mFirstPTS = PTS; 380 PTS = 0; 381 } else if (PTS < mFirstPTS) { 382 PTS = 0; 383 } else { 384 PTS -= mFirstPTS; 385 } 386 } 387 388 return (PTS * 100) / 9; 389} 390 391//////////////////////////////////////////////////////////////////////////////// 392 393ATSParser::Stream::Stream( 394 Program *program, unsigned elementaryPID, unsigned streamType) 395 : mProgram(program), 396 mElementaryPID(elementaryPID), 397 mStreamType(streamType), 398 mPayloadStarted(false), 399 mQueue(NULL) { 400 switch (mStreamType) { 401 case STREAMTYPE_H264: 402 mQueue = new ElementaryStreamQueue(ElementaryStreamQueue::H264); 403 break; 404 case STREAMTYPE_MPEG2_AUDIO_ATDS: 405 mQueue = new ElementaryStreamQueue(ElementaryStreamQueue::AAC); 406 break; 407 case STREAMTYPE_MPEG1_AUDIO: 408 case STREAMTYPE_MPEG2_AUDIO: 409 mQueue = new ElementaryStreamQueue( 410 ElementaryStreamQueue::MPEG_AUDIO); 411 break; 412 413 case STREAMTYPE_MPEG1_VIDEO: 414 case STREAMTYPE_MPEG2_VIDEO: 415 mQueue = new ElementaryStreamQueue( 416 ElementaryStreamQueue::MPEG_VIDEO); 417 break; 418 419 case STREAMTYPE_MPEG4_VIDEO: 420 mQueue = new ElementaryStreamQueue( 421 ElementaryStreamQueue::MPEG4_VIDEO); 422 break; 423 424 default: 425 break; 426 } 427 428 LOGV("new stream PID 0x%02x, type 0x%02x", elementaryPID, streamType); 429 430 if (mQueue != NULL) { 431 mBuffer = new ABuffer(192 * 1024); 432 mBuffer->setRange(0, 0); 433 } 434} 435 436ATSParser::Stream::~Stream() { 437 delete mQueue; 438 mQueue = NULL; 439} 440 441void ATSParser::Stream::parse( 442 unsigned payload_unit_start_indicator, ABitReader *br) { 443 if (mQueue == NULL) { 444 return; 445 } 446 447 if (payload_unit_start_indicator) { 448 if (mPayloadStarted) { 449 // Otherwise we run the danger of receiving the trailing bytes 450 // of a PES packet that we never saw the start of and assuming 451 // we have a a complete PES packet. 452 453 flush(); 454 } 455 456 mPayloadStarted = true; 457 } 458 459 if (!mPayloadStarted) { 460 return; 461 } 462 463 size_t payloadSizeBits = br->numBitsLeft(); 464 CHECK_EQ(payloadSizeBits % 8, 0u); 465 466 size_t neededSize = mBuffer->size() + payloadSizeBits / 8; 467 if (mBuffer->capacity() < neededSize) { 468 // Increment in multiples of 64K. 469 neededSize = (neededSize + 65535) & ~65535; 470 471 LOGI("resizing buffer to %d bytes", neededSize); 472 473 sp<ABuffer> newBuffer = new ABuffer(neededSize); 474 memcpy(newBuffer->data(), mBuffer->data(), mBuffer->size()); 475 newBuffer->setRange(0, mBuffer->size()); 476 mBuffer = newBuffer; 477 } 478 479 memcpy(mBuffer->data() + mBuffer->size(), br->data(), payloadSizeBits / 8); 480 mBuffer->setRange(0, mBuffer->size() + payloadSizeBits / 8); 481} 482 483void ATSParser::Stream::signalDiscontinuity( 484 DiscontinuityType type, const sp<AMessage> &extra) { 485 if (mQueue == NULL) { 486 return; 487 } 488 489 mPayloadStarted = false; 490 mBuffer->setRange(0, 0); 491 492 switch (type) { 493 case DISCONTINUITY_SEEK: 494 case DISCONTINUITY_FORMATCHANGE: 495 { 496 bool isASeek = (type == DISCONTINUITY_SEEK); 497 498 mQueue->clear(!isASeek); 499 500 uint64_t resumeAtPTS; 501 if (extra != NULL 502 && extra->findInt64( 503 IStreamListener::kKeyResumeAtPTS, 504 (int64_t *)&resumeAtPTS)) { 505 int64_t resumeAtMediaTimeUs = 506 mProgram->convertPTSToTimestamp(resumeAtPTS); 507 508 extra->setInt64("resume-at-mediatimeUs", resumeAtMediaTimeUs); 509 } 510 511 if (mSource != NULL) { 512 mSource->queueDiscontinuity(type, extra); 513 } 514 break; 515 } 516 517 default: 518 TRESPASS(); 519 break; 520 } 521} 522 523void ATSParser::Stream::signalEOS(status_t finalResult) { 524 if (mSource != NULL) { 525 mSource->signalEOS(finalResult); 526 } 527} 528 529void ATSParser::Stream::parsePES(ABitReader *br) { 530 unsigned packet_startcode_prefix = br->getBits(24); 531 532 LOGV("packet_startcode_prefix = 0x%08x", packet_startcode_prefix); 533 534 if (packet_startcode_prefix != 1) { 535 LOGV("Supposedly payload_unit_start=1 unit does not start " 536 "with startcode."); 537 return; 538 } 539 540 CHECK_EQ(packet_startcode_prefix, 0x000001u); 541 542 unsigned stream_id = br->getBits(8); 543 LOGV("stream_id = 0x%02x", stream_id); 544 545 unsigned PES_packet_length = br->getBits(16); 546 LOGV("PES_packet_length = %u", PES_packet_length); 547 548 if (stream_id != 0xbc // program_stream_map 549 && stream_id != 0xbe // padding_stream 550 && stream_id != 0xbf // private_stream_2 551 && stream_id != 0xf0 // ECM 552 && stream_id != 0xf1 // EMM 553 && stream_id != 0xff // program_stream_directory 554 && stream_id != 0xf2 // DSMCC 555 && stream_id != 0xf8) { // H.222.1 type E 556 CHECK_EQ(br->getBits(2), 2u); 557 558 MY_LOGV("PES_scrambling_control = %u", br->getBits(2)); 559 MY_LOGV("PES_priority = %u", br->getBits(1)); 560 MY_LOGV("data_alignment_indicator = %u", br->getBits(1)); 561 MY_LOGV("copyright = %u", br->getBits(1)); 562 MY_LOGV("original_or_copy = %u", br->getBits(1)); 563 564 unsigned PTS_DTS_flags = br->getBits(2); 565 LOGV("PTS_DTS_flags = %u", PTS_DTS_flags); 566 567 unsigned ESCR_flag = br->getBits(1); 568 LOGV("ESCR_flag = %u", ESCR_flag); 569 570 unsigned ES_rate_flag = br->getBits(1); 571 LOGV("ES_rate_flag = %u", ES_rate_flag); 572 573 unsigned DSM_trick_mode_flag = br->getBits(1); 574 LOGV("DSM_trick_mode_flag = %u", DSM_trick_mode_flag); 575 576 unsigned additional_copy_info_flag = br->getBits(1); 577 LOGV("additional_copy_info_flag = %u", additional_copy_info_flag); 578 579 MY_LOGV("PES_CRC_flag = %u", br->getBits(1)); 580 MY_LOGV("PES_extension_flag = %u", br->getBits(1)); 581 582 unsigned PES_header_data_length = br->getBits(8); 583 LOGV("PES_header_data_length = %u", PES_header_data_length); 584 585 unsigned optional_bytes_remaining = PES_header_data_length; 586 587 uint64_t PTS = 0, DTS = 0; 588 589 if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) { 590 CHECK_GE(optional_bytes_remaining, 5u); 591 592 CHECK_EQ(br->getBits(4), PTS_DTS_flags); 593 594 PTS = ((uint64_t)br->getBits(3)) << 30; 595 CHECK_EQ(br->getBits(1), 1u); 596 PTS |= ((uint64_t)br->getBits(15)) << 15; 597 CHECK_EQ(br->getBits(1), 1u); 598 PTS |= br->getBits(15); 599 CHECK_EQ(br->getBits(1), 1u); 600 601 LOGV("PTS = %llu", PTS); 602 // LOGI("PTS = %.2f secs", PTS / 90000.0f); 603 604 optional_bytes_remaining -= 5; 605 606 if (PTS_DTS_flags == 3) { 607 CHECK_GE(optional_bytes_remaining, 5u); 608 609 CHECK_EQ(br->getBits(4), 1u); 610 611 DTS = ((uint64_t)br->getBits(3)) << 30; 612 CHECK_EQ(br->getBits(1), 1u); 613 DTS |= ((uint64_t)br->getBits(15)) << 15; 614 CHECK_EQ(br->getBits(1), 1u); 615 DTS |= br->getBits(15); 616 CHECK_EQ(br->getBits(1), 1u); 617 618 LOGV("DTS = %llu", DTS); 619 620 optional_bytes_remaining -= 5; 621 } 622 } 623 624 if (ESCR_flag) { 625 CHECK_GE(optional_bytes_remaining, 6u); 626 627 br->getBits(2); 628 629 uint64_t ESCR = ((uint64_t)br->getBits(3)) << 30; 630 CHECK_EQ(br->getBits(1), 1u); 631 ESCR |= ((uint64_t)br->getBits(15)) << 15; 632 CHECK_EQ(br->getBits(1), 1u); 633 ESCR |= br->getBits(15); 634 CHECK_EQ(br->getBits(1), 1u); 635 636 LOGV("ESCR = %llu", ESCR); 637 MY_LOGV("ESCR_extension = %u", br->getBits(9)); 638 639 CHECK_EQ(br->getBits(1), 1u); 640 641 optional_bytes_remaining -= 6; 642 } 643 644 if (ES_rate_flag) { 645 CHECK_GE(optional_bytes_remaining, 3u); 646 647 CHECK_EQ(br->getBits(1), 1u); 648 MY_LOGV("ES_rate = %u", br->getBits(22)); 649 CHECK_EQ(br->getBits(1), 1u); 650 651 optional_bytes_remaining -= 3; 652 } 653 654 br->skipBits(optional_bytes_remaining * 8); 655 656 // ES data follows. 657 658 if (PES_packet_length != 0) { 659 CHECK_GE(PES_packet_length, PES_header_data_length + 3); 660 661 unsigned dataLength = 662 PES_packet_length - 3 - PES_header_data_length; 663 664 CHECK_GE(br->numBitsLeft(), dataLength * 8); 665 666 onPayloadData( 667 PTS_DTS_flags, PTS, DTS, br->data(), dataLength); 668 669 br->skipBits(dataLength * 8); 670 } else { 671 onPayloadData( 672 PTS_DTS_flags, PTS, DTS, 673 br->data(), br->numBitsLeft() / 8); 674 675 size_t payloadSizeBits = br->numBitsLeft(); 676 CHECK_EQ(payloadSizeBits % 8, 0u); 677 678 LOGV("There's %d bytes of payload.", payloadSizeBits / 8); 679 } 680 } else if (stream_id == 0xbe) { // padding_stream 681 CHECK_NE(PES_packet_length, 0u); 682 br->skipBits(PES_packet_length * 8); 683 } else { 684 CHECK_NE(PES_packet_length, 0u); 685 br->skipBits(PES_packet_length * 8); 686 } 687} 688 689void ATSParser::Stream::flush() { 690 if (mBuffer->size() == 0) { 691 return; 692 } 693 694 LOGV("flushing stream 0x%04x size = %d", mElementaryPID, mBuffer->size()); 695 696 ABitReader br(mBuffer->data(), mBuffer->size()); 697 parsePES(&br); 698 699 mBuffer->setRange(0, 0); 700} 701 702void ATSParser::Stream::onPayloadData( 703 unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS, 704 const uint8_t *data, size_t size) { 705 LOGV("onPayloadData mStreamType=0x%02x", mStreamType); 706 707 CHECK(PTS_DTS_flags == 2 || PTS_DTS_flags == 3); 708 int64_t timeUs = mProgram->convertPTSToTimestamp(PTS); 709 710 status_t err = mQueue->appendData(data, size, timeUs); 711 712 if (err != OK) { 713 return; 714 } 715 716 sp<ABuffer> accessUnit; 717 while ((accessUnit = mQueue->dequeueAccessUnit()) != NULL) { 718 if (mSource == NULL) { 719 sp<MetaData> meta = mQueue->getFormat(); 720 721 if (meta != NULL) { 722 LOGV("Stream PID 0x%08x of type 0x%02x now has data.", 723 mElementaryPID, mStreamType); 724 725 mSource = new AnotherPacketSource(meta); 726 mSource->queueAccessUnit(accessUnit); 727 } 728 } else if (mQueue->getFormat() != NULL) { 729 // After a discontinuity we invalidate the queue's format 730 // and won't enqueue any access units to the source until 731 // the queue has reestablished the new format. 732 733 if (mSource->getFormat() == NULL) { 734 mSource->setFormat(mQueue->getFormat()); 735 } 736 mSource->queueAccessUnit(accessUnit); 737 } 738 } 739} 740 741sp<MediaSource> ATSParser::Stream::getSource(SourceType type) { 742 switch (type) { 743 case VIDEO: 744 { 745 if (mStreamType == STREAMTYPE_H264 746 || mStreamType == STREAMTYPE_MPEG1_VIDEO 747 || mStreamType == STREAMTYPE_MPEG2_VIDEO 748 || mStreamType == STREAMTYPE_MPEG4_VIDEO) { 749 return mSource; 750 } 751 break; 752 } 753 754 case AUDIO: 755 { 756 if (mStreamType == STREAMTYPE_MPEG1_AUDIO 757 || mStreamType == STREAMTYPE_MPEG2_AUDIO 758 || mStreamType == STREAMTYPE_MPEG2_AUDIO_ATDS) { 759 return mSource; 760 } 761 break; 762 } 763 764 default: 765 break; 766 } 767 768 return NULL; 769} 770 771//////////////////////////////////////////////////////////////////////////////// 772 773ATSParser::ATSParser(uint32_t flags) 774 : mFlags(flags) { 775} 776 777ATSParser::~ATSParser() { 778} 779 780status_t ATSParser::feedTSPacket(const void *data, size_t size) { 781 CHECK_EQ(size, kTSPacketSize); 782 783 ABitReader br((const uint8_t *)data, kTSPacketSize); 784 return parseTS(&br); 785} 786 787void ATSParser::signalDiscontinuity( 788 DiscontinuityType type, const sp<AMessage> &extra) { 789 for (size_t i = 0; i < mPrograms.size(); ++i) { 790 mPrograms.editItemAt(i)->signalDiscontinuity(type, extra); 791 } 792} 793 794void ATSParser::signalEOS(status_t finalResult) { 795 CHECK_NE(finalResult, (status_t)OK); 796 797 for (size_t i = 0; i < mPrograms.size(); ++i) { 798 mPrograms.editItemAt(i)->signalEOS(finalResult); 799 } 800} 801 802void ATSParser::parseProgramAssociationTable(ABitReader *br) { 803 unsigned table_id = br->getBits(8); 804 LOGV(" table_id = %u", table_id); 805 CHECK_EQ(table_id, 0x00u); 806 807 unsigned section_syntax_indictor = br->getBits(1); 808 LOGV(" section_syntax_indictor = %u", section_syntax_indictor); 809 CHECK_EQ(section_syntax_indictor, 1u); 810 811 CHECK_EQ(br->getBits(1), 0u); 812 MY_LOGV(" reserved = %u", br->getBits(2)); 813 814 unsigned section_length = br->getBits(12); 815 LOGV(" section_length = %u", section_length); 816 CHECK_EQ(section_length & 0xc00, 0u); 817 818 MY_LOGV(" transport_stream_id = %u", br->getBits(16)); 819 MY_LOGV(" reserved = %u", br->getBits(2)); 820 MY_LOGV(" version_number = %u", br->getBits(5)); 821 MY_LOGV(" current_next_indicator = %u", br->getBits(1)); 822 MY_LOGV(" section_number = %u", br->getBits(8)); 823 MY_LOGV(" last_section_number = %u", br->getBits(8)); 824 825 size_t numProgramBytes = (section_length - 5 /* header */ - 4 /* crc */); 826 CHECK_EQ((numProgramBytes % 4), 0u); 827 828 for (size_t i = 0; i < numProgramBytes / 4; ++i) { 829 unsigned program_number = br->getBits(16); 830 LOGV(" program_number = %u", program_number); 831 832 MY_LOGV(" reserved = %u", br->getBits(3)); 833 834 if (program_number == 0) { 835 MY_LOGV(" network_PID = 0x%04x", br->getBits(13)); 836 } else { 837 unsigned programMapPID = br->getBits(13); 838 839 LOGV(" program_map_PID = 0x%04x", programMapPID); 840 841 bool found = false; 842 for (size_t index = 0; index < mPrograms.size(); ++index) { 843 const sp<Program> &program = mPrograms.itemAt(index); 844 845 if (program->number() == program_number) { 846 program->updateProgramMapPID(programMapPID); 847 found = true; 848 break; 849 } 850 } 851 852 if (!found) { 853 mPrograms.push( 854 new Program(this, program_number, programMapPID)); 855 } 856 } 857 } 858 859 MY_LOGV(" CRC = 0x%08x", br->getBits(32)); 860} 861 862status_t ATSParser::parsePID( 863 ABitReader *br, unsigned PID, 864 unsigned payload_unit_start_indicator) { 865 if (PID == 0) { 866 if (payload_unit_start_indicator) { 867 unsigned skip = br->getBits(8); 868 br->skipBits(skip * 8); 869 } 870 parseProgramAssociationTable(br); 871 return OK; 872 } 873 874 bool handled = false; 875 for (size_t i = 0; i < mPrograms.size(); ++i) { 876 status_t err; 877 if (mPrograms.editItemAt(i)->parsePID( 878 PID, payload_unit_start_indicator, br, &err)) { 879 if (err != OK) { 880 return err; 881 } 882 883 handled = true; 884 break; 885 } 886 } 887 888 if (!handled) { 889 LOGV("PID 0x%04x not handled.", PID); 890 } 891 892 return OK; 893} 894 895void ATSParser::parseAdaptationField(ABitReader *br) { 896 unsigned adaptation_field_length = br->getBits(8); 897 if (adaptation_field_length > 0) { 898 br->skipBits(adaptation_field_length * 8); // XXX 899 } 900} 901 902status_t ATSParser::parseTS(ABitReader *br) { 903 LOGV("---"); 904 905 unsigned sync_byte = br->getBits(8); 906 CHECK_EQ(sync_byte, 0x47u); 907 908 MY_LOGV("transport_error_indicator = %u", br->getBits(1)); 909 910 unsigned payload_unit_start_indicator = br->getBits(1); 911 LOGV("payload_unit_start_indicator = %u", payload_unit_start_indicator); 912 913 MY_LOGV("transport_priority = %u", br->getBits(1)); 914 915 unsigned PID = br->getBits(13); 916 LOGV("PID = 0x%04x", PID); 917 918 MY_LOGV("transport_scrambling_control = %u", br->getBits(2)); 919 920 unsigned adaptation_field_control = br->getBits(2); 921 LOGV("adaptation_field_control = %u", adaptation_field_control); 922 923 unsigned continuity_counter = br->getBits(4); 924 LOGV("continuity_counter = %u", continuity_counter); 925 926 // LOGI("PID = 0x%04x, continuity_counter = %u", PID, continuity_counter); 927 928 if (adaptation_field_control == 2 || adaptation_field_control == 3) { 929 parseAdaptationField(br); 930 } 931 932 if (adaptation_field_control == 1 || adaptation_field_control == 3) { 933 return parsePID(br, PID, payload_unit_start_indicator); 934 } 935 936 return OK; 937} 938 939sp<MediaSource> ATSParser::getSource(SourceType type) { 940 int which = -1; // any 941 942 for (size_t i = 0; i < mPrograms.size(); ++i) { 943 const sp<Program> &program = mPrograms.editItemAt(i); 944 945 if (which >= 0 && (int)program->number() != which) { 946 continue; 947 } 948 949 sp<MediaSource> source = program->getSource(type); 950 951 if (source != NULL) { 952 return source; 953 } 954 } 955 956 return NULL; 957} 958 959bool ATSParser::PTSTimeDeltaEstablished() { 960 if (mPrograms.isEmpty()) { 961 return false; 962 } 963 964 return mPrograms.editItemAt(0)->PTSTimeDeltaEstablished(); 965} 966 967} // namespace android 968