ATSParser.cpp revision 5bc087c573c70c84c6a39946457590b42d392a33
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 <utils/KeyedVector.h> 36 37namespace android { 38 39// I want the expression "y" evaluated even if verbose logging is off. 40#define MY_LOGV(x, y) \ 41 do { unsigned tmp = y; LOGV(x, tmp); } while (0) 42 43static const size_t kTSPacketSize = 188; 44 45struct ATSParser::Program : public RefBase { 46 Program(ATSParser *parser, unsigned programMapPID); 47 48 bool parsePID( 49 unsigned pid, unsigned payload_unit_start_indicator, 50 ABitReader *br); 51 52 void signalDiscontinuity(DiscontinuityType type); 53 void signalEOS(status_t finalResult); 54 55 sp<MediaSource> getSource(SourceType type); 56 57 int64_t convertPTSToTimestamp(uint64_t PTS); 58 59private: 60 ATSParser *mParser; 61 unsigned mProgramMapPID; 62 KeyedVector<unsigned, sp<Stream> > mStreams; 63 bool mFirstPTSValid; 64 uint64_t mFirstPTS; 65 66 void parseProgramMap(ABitReader *br); 67 68 DISALLOW_EVIL_CONSTRUCTORS(Program); 69}; 70 71struct ATSParser::Stream : public RefBase { 72 Stream(Program *program, unsigned elementaryPID, unsigned streamType); 73 74 void parse( 75 unsigned payload_unit_start_indicator, 76 ABitReader *br); 77 78 void signalDiscontinuity(DiscontinuityType type); 79 void signalEOS(status_t finalResult); 80 81 sp<MediaSource> getSource(SourceType type); 82 83protected: 84 virtual ~Stream(); 85 86private: 87 Program *mProgram; 88 unsigned mElementaryPID; 89 unsigned mStreamType; 90 91 sp<ABuffer> mBuffer; 92 sp<AnotherPacketSource> mSource; 93 bool mPayloadStarted; 94 95 ElementaryStreamQueue mQueue; 96 97 void flush(); 98 void parsePES(ABitReader *br); 99 100 void onPayloadData( 101 unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS, 102 const uint8_t *data, size_t size); 103 104 void extractAACFrames(const sp<ABuffer> &buffer); 105 106 DISALLOW_EVIL_CONSTRUCTORS(Stream); 107}; 108 109//////////////////////////////////////////////////////////////////////////////// 110 111ATSParser::Program::Program(ATSParser *parser, unsigned programMapPID) 112 : mParser(parser), 113 mProgramMapPID(programMapPID), 114 mFirstPTSValid(false), 115 mFirstPTS(0) { 116} 117 118bool ATSParser::Program::parsePID( 119 unsigned pid, unsigned payload_unit_start_indicator, 120 ABitReader *br) { 121 if (pid == mProgramMapPID) { 122 if (payload_unit_start_indicator) { 123 unsigned skip = br->getBits(8); 124 br->skipBits(skip * 8); 125 } 126 127 parseProgramMap(br); 128 return true; 129 } 130 131 ssize_t index = mStreams.indexOfKey(pid); 132 if (index < 0) { 133 return false; 134 } 135 136 mStreams.editValueAt(index)->parse( 137 payload_unit_start_indicator, br); 138 139 return true; 140} 141 142void ATSParser::Program::signalDiscontinuity(DiscontinuityType type) { 143 for (size_t i = 0; i < mStreams.size(); ++i) { 144 mStreams.editValueAt(i)->signalDiscontinuity(type); 145 } 146} 147 148void ATSParser::Program::signalEOS(status_t finalResult) { 149 for (size_t i = 0; i < mStreams.size(); ++i) { 150 mStreams.editValueAt(i)->signalEOS(finalResult); 151 } 152} 153 154void ATSParser::Program::parseProgramMap(ABitReader *br) { 155 unsigned table_id = br->getBits(8); 156 LOGV(" table_id = %u", table_id); 157 CHECK_EQ(table_id, 0x02u); 158 159 unsigned section_syntax_indicator = br->getBits(1); 160 LOGV(" section_syntax_indicator = %u", section_syntax_indicator); 161 CHECK_EQ(section_syntax_indicator, 1u); 162 163 CHECK_EQ(br->getBits(1), 0u); 164 MY_LOGV(" reserved = %u", br->getBits(2)); 165 166 unsigned section_length = br->getBits(12); 167 LOGV(" section_length = %u", section_length); 168 CHECK_EQ(section_length & 0xc00, 0u); 169 CHECK_LE(section_length, 1021u); 170 171 MY_LOGV(" program_number = %u", br->getBits(16)); 172 MY_LOGV(" reserved = %u", br->getBits(2)); 173 MY_LOGV(" version_number = %u", br->getBits(5)); 174 MY_LOGV(" current_next_indicator = %u", br->getBits(1)); 175 MY_LOGV(" section_number = %u", br->getBits(8)); 176 MY_LOGV(" last_section_number = %u", br->getBits(8)); 177 MY_LOGV(" reserved = %u", br->getBits(3)); 178 MY_LOGV(" PCR_PID = 0x%04x", br->getBits(13)); 179 MY_LOGV(" reserved = %u", br->getBits(4)); 180 181 unsigned program_info_length = br->getBits(12); 182 LOGV(" program_info_length = %u", program_info_length); 183 CHECK_EQ(program_info_length & 0xc00, 0u); 184 185 br->skipBits(program_info_length * 8); // skip descriptors 186 187 // infoBytesRemaining is the number of bytes that make up the 188 // variable length section of ES_infos. It does not include the 189 // final CRC. 190 size_t infoBytesRemaining = section_length - 9 - program_info_length - 4; 191 192 while (infoBytesRemaining > 0) { 193 CHECK_GE(infoBytesRemaining, 5u); 194 195 unsigned streamType = br->getBits(8); 196 LOGV(" stream_type = 0x%02x", streamType); 197 198 MY_LOGV(" reserved = %u", br->getBits(3)); 199 200 unsigned elementaryPID = br->getBits(13); 201 LOGV(" elementary_PID = 0x%04x", elementaryPID); 202 203 MY_LOGV(" reserved = %u", br->getBits(4)); 204 205 unsigned ES_info_length = br->getBits(12); 206 LOGV(" ES_info_length = %u", ES_info_length); 207 CHECK_EQ(ES_info_length & 0xc00, 0u); 208 209 CHECK_GE(infoBytesRemaining - 5, ES_info_length); 210 211#if 0 212 br->skipBits(ES_info_length * 8); // skip descriptors 213#else 214 unsigned info_bytes_remaining = ES_info_length; 215 while (info_bytes_remaining >= 2) { 216 MY_LOGV(" tag = 0x%02x", br->getBits(8)); 217 218 unsigned descLength = br->getBits(8); 219 LOGV(" len = %u", descLength); 220 221 CHECK_GE(info_bytes_remaining, 2 + descLength); 222 223 br->skipBits(descLength * 8); 224 225 info_bytes_remaining -= descLength + 2; 226 } 227 CHECK_EQ(info_bytes_remaining, 0u); 228#endif 229 230 ssize_t index = mStreams.indexOfKey(elementaryPID); 231#if 0 // XXX revisit 232 CHECK_LT(index, 0); 233 mStreams.add(elementaryPID, 234 new Stream(this, elementaryPID, streamType)); 235#else 236 if (index < 0) { 237 mStreams.add(elementaryPID, 238 new Stream(this, elementaryPID, streamType)); 239 } 240#endif 241 242 infoBytesRemaining -= 5 + ES_info_length; 243 } 244 245 CHECK_EQ(infoBytesRemaining, 0u); 246 247 MY_LOGV(" CRC = 0x%08x", br->getBits(32)); 248} 249 250sp<MediaSource> ATSParser::Program::getSource(SourceType type) { 251 size_t index = (type == MPEG2ADTS_AUDIO) ? 0 : 0; 252 253 for (size_t i = 0; i < mStreams.size(); ++i) { 254 sp<MediaSource> source = mStreams.editValueAt(i)->getSource(type); 255 if (source != NULL) { 256 if (index == 0) { 257 return source; 258 } 259 --index; 260 } 261 } 262 263 return NULL; 264} 265 266int64_t ATSParser::Program::convertPTSToTimestamp(uint64_t PTS) { 267 if (!mFirstPTSValid) { 268 mFirstPTSValid = true; 269 mFirstPTS = PTS; 270 PTS = 0; 271 } else if (PTS < mFirstPTS) { 272 PTS = 0; 273 } else { 274 PTS -= mFirstPTS; 275 } 276 277 return (PTS * 100) / 9; 278} 279 280//////////////////////////////////////////////////////////////////////////////// 281 282ATSParser::Stream::Stream( 283 Program *program, unsigned elementaryPID, unsigned streamType) 284 : mProgram(program), 285 mElementaryPID(elementaryPID), 286 mStreamType(streamType), 287 mBuffer(new ABuffer(192 * 1024)), 288 mPayloadStarted(false), 289 mQueue(streamType == 0x1b 290 ? ElementaryStreamQueue::H264 : ElementaryStreamQueue::AAC) { 291 mBuffer->setRange(0, 0); 292 293 LOGV("new stream PID 0x%02x, type 0x%02x", elementaryPID, streamType); 294} 295 296ATSParser::Stream::~Stream() { 297} 298 299void ATSParser::Stream::parse( 300 unsigned payload_unit_start_indicator, ABitReader *br) { 301 if (payload_unit_start_indicator) { 302 if (mPayloadStarted) { 303 // Otherwise we run the danger of receiving the trailing bytes 304 // of a PES packet that we never saw the start of and assuming 305 // we have a a complete PES packet. 306 307 flush(); 308 } 309 310 mPayloadStarted = true; 311 } 312 313 if (!mPayloadStarted) { 314 return; 315 } 316 317 size_t payloadSizeBits = br->numBitsLeft(); 318 CHECK_EQ(payloadSizeBits % 8, 0u); 319 320 CHECK_LE(mBuffer->size() + payloadSizeBits / 8, mBuffer->capacity()); 321 322 memcpy(mBuffer->data() + mBuffer->size(), br->data(), payloadSizeBits / 8); 323 mBuffer->setRange(0, mBuffer->size() + payloadSizeBits / 8); 324} 325 326void ATSParser::Stream::signalDiscontinuity(DiscontinuityType type) { 327 mPayloadStarted = false; 328 mBuffer->setRange(0, 0); 329 330 switch (type) { 331 case DISCONTINUITY_HTTPLIVE: 332 { 333 mQueue.clear(true); 334 335 if (mStreamType == 0x1b && mSource != NULL) { 336 // Don't signal discontinuities on audio streams. 337 mSource->queueDiscontinuity(type); 338 } 339 break; 340 } 341 342 case DISCONTINUITY_SEEK: 343 case DISCONTINUITY_FORMATCHANGE: 344 { 345 bool isASeek = (type == DISCONTINUITY_SEEK); 346 347 mQueue.clear(!isASeek); 348 349 if (mSource != NULL) { 350 mSource->clear(); 351 mSource->queueDiscontinuity(type); 352 } 353 break; 354 } 355 356 default: 357 TRESPASS(); 358 break; 359 } 360} 361 362void ATSParser::Stream::signalEOS(status_t finalResult) { 363 if (mSource != NULL) { 364 mSource->signalEOS(finalResult); 365 } 366} 367 368void ATSParser::Stream::parsePES(ABitReader *br) { 369 unsigned packet_startcode_prefix = br->getBits(24); 370 371 LOGV("packet_startcode_prefix = 0x%08x", packet_startcode_prefix); 372 373 CHECK_EQ(packet_startcode_prefix, 0x000001u); 374 375 unsigned stream_id = br->getBits(8); 376 LOGV("stream_id = 0x%02x", stream_id); 377 378 unsigned PES_packet_length = br->getBits(16); 379 LOGV("PES_packet_length = %u", PES_packet_length); 380 381 if (stream_id != 0xbc // program_stream_map 382 && stream_id != 0xbe // padding_stream 383 && stream_id != 0xbf // private_stream_2 384 && stream_id != 0xf0 // ECM 385 && stream_id != 0xf1 // EMM 386 && stream_id != 0xff // program_stream_directory 387 && stream_id != 0xf2 // DSMCC 388 && stream_id != 0xf8) { // H.222.1 type E 389 CHECK_EQ(br->getBits(2), 2u); 390 391 MY_LOGV("PES_scrambling_control = %u", br->getBits(2)); 392 MY_LOGV("PES_priority = %u", br->getBits(1)); 393 MY_LOGV("data_alignment_indicator = %u", br->getBits(1)); 394 MY_LOGV("copyright = %u", br->getBits(1)); 395 MY_LOGV("original_or_copy = %u", br->getBits(1)); 396 397 unsigned PTS_DTS_flags = br->getBits(2); 398 LOGV("PTS_DTS_flags = %u", PTS_DTS_flags); 399 400 unsigned ESCR_flag = br->getBits(1); 401 LOGV("ESCR_flag = %u", ESCR_flag); 402 403 unsigned ES_rate_flag = br->getBits(1); 404 LOGV("ES_rate_flag = %u", ES_rate_flag); 405 406 unsigned DSM_trick_mode_flag = br->getBits(1); 407 LOGV("DSM_trick_mode_flag = %u", DSM_trick_mode_flag); 408 409 unsigned additional_copy_info_flag = br->getBits(1); 410 LOGV("additional_copy_info_flag = %u", additional_copy_info_flag); 411 412 MY_LOGV("PES_CRC_flag = %u", br->getBits(1)); 413 MY_LOGV("PES_extension_flag = %u", br->getBits(1)); 414 415 unsigned PES_header_data_length = br->getBits(8); 416 LOGV("PES_header_data_length = %u", PES_header_data_length); 417 418 unsigned optional_bytes_remaining = PES_header_data_length; 419 420 uint64_t PTS = 0, DTS = 0; 421 422 if (PTS_DTS_flags == 2 || PTS_DTS_flags == 3) { 423 CHECK_GE(optional_bytes_remaining, 5u); 424 425 CHECK_EQ(br->getBits(4), PTS_DTS_flags); 426 427 PTS = ((uint64_t)br->getBits(3)) << 30; 428 CHECK_EQ(br->getBits(1), 1u); 429 PTS |= ((uint64_t)br->getBits(15)) << 15; 430 CHECK_EQ(br->getBits(1), 1u); 431 PTS |= br->getBits(15); 432 CHECK_EQ(br->getBits(1), 1u); 433 434 LOGV("PTS = %llu", PTS); 435 // LOGI("PTS = %.2f secs", PTS / 90000.0f); 436 437 optional_bytes_remaining -= 5; 438 439 if (PTS_DTS_flags == 3) { 440 CHECK_GE(optional_bytes_remaining, 5u); 441 442 CHECK_EQ(br->getBits(4), 1u); 443 444 DTS = ((uint64_t)br->getBits(3)) << 30; 445 CHECK_EQ(br->getBits(1), 1u); 446 DTS |= ((uint64_t)br->getBits(15)) << 15; 447 CHECK_EQ(br->getBits(1), 1u); 448 DTS |= br->getBits(15); 449 CHECK_EQ(br->getBits(1), 1u); 450 451 LOGV("DTS = %llu", DTS); 452 453 optional_bytes_remaining -= 5; 454 } 455 } 456 457 if (ESCR_flag) { 458 CHECK_GE(optional_bytes_remaining, 6u); 459 460 br->getBits(2); 461 462 uint64_t ESCR = ((uint64_t)br->getBits(3)) << 30; 463 CHECK_EQ(br->getBits(1), 1u); 464 ESCR |= ((uint64_t)br->getBits(15)) << 15; 465 CHECK_EQ(br->getBits(1), 1u); 466 ESCR |= br->getBits(15); 467 CHECK_EQ(br->getBits(1), 1u); 468 469 LOGV("ESCR = %llu", ESCR); 470 MY_LOGV("ESCR_extension = %u", br->getBits(9)); 471 472 CHECK_EQ(br->getBits(1), 1u); 473 474 optional_bytes_remaining -= 6; 475 } 476 477 if (ES_rate_flag) { 478 CHECK_GE(optional_bytes_remaining, 3u); 479 480 CHECK_EQ(br->getBits(1), 1u); 481 MY_LOGV("ES_rate = %u", br->getBits(22)); 482 CHECK_EQ(br->getBits(1), 1u); 483 484 optional_bytes_remaining -= 3; 485 } 486 487 br->skipBits(optional_bytes_remaining * 8); 488 489 // ES data follows. 490 491 if (PES_packet_length != 0) { 492 CHECK_GE(PES_packet_length, PES_header_data_length + 3); 493 494 unsigned dataLength = 495 PES_packet_length - 3 - PES_header_data_length; 496 497 CHECK_GE(br->numBitsLeft(), dataLength * 8); 498 499 onPayloadData( 500 PTS_DTS_flags, PTS, DTS, br->data(), dataLength); 501 502 br->skipBits(dataLength * 8); 503 } else { 504 onPayloadData( 505 PTS_DTS_flags, PTS, DTS, 506 br->data(), br->numBitsLeft() / 8); 507 508 size_t payloadSizeBits = br->numBitsLeft(); 509 CHECK_EQ(payloadSizeBits % 8, 0u); 510 511 LOGV("There's %d bytes of payload.", payloadSizeBits / 8); 512 } 513 } else if (stream_id == 0xbe) { // padding_stream 514 CHECK_NE(PES_packet_length, 0u); 515 br->skipBits(PES_packet_length * 8); 516 } else { 517 CHECK_NE(PES_packet_length, 0u); 518 br->skipBits(PES_packet_length * 8); 519 } 520} 521 522void ATSParser::Stream::flush() { 523 if (mBuffer->size() == 0) { 524 return; 525 } 526 527 LOGV("flushing stream 0x%04x size = %d", mElementaryPID, mBuffer->size()); 528 529 ABitReader br(mBuffer->data(), mBuffer->size()); 530 parsePES(&br); 531 532 mBuffer->setRange(0, 0); 533} 534 535void ATSParser::Stream::onPayloadData( 536 unsigned PTS_DTS_flags, uint64_t PTS, uint64_t DTS, 537 const uint8_t *data, size_t size) { 538 LOGV("onPayloadData mStreamType=0x%02x", mStreamType); 539 540 CHECK(PTS_DTS_flags == 2 || PTS_DTS_flags == 3); 541 int64_t timeUs = mProgram->convertPTSToTimestamp(PTS); 542 543 status_t err = mQueue.appendData(data, size, timeUs); 544 545 if (err != OK) { 546 return; 547 } 548 549 sp<ABuffer> accessUnit; 550 while ((accessUnit = mQueue.dequeueAccessUnit()) != NULL) { 551 if (mSource == NULL) { 552 sp<MetaData> meta = mQueue.getFormat(); 553 554 if (meta != NULL) { 555 LOGV("created source!"); 556 mSource = new AnotherPacketSource(meta); 557 558 mSource->queueAccessUnit(accessUnit); 559 } 560 } else if (mQueue.getFormat() != NULL) { 561 // After a discontinuity we invalidate the queue's format 562 // and won't enqueue any access units to the source until 563 // the queue has reestablished the new format. 564 565 if (mSource->getFormat() == NULL) { 566 mSource->setFormat(mQueue.getFormat()); 567 } 568 mSource->queueAccessUnit(accessUnit); 569 } 570 } 571} 572 573sp<MediaSource> ATSParser::Stream::getSource(SourceType type) { 574 if ((type == AVC_VIDEO && mStreamType == 0x1b) 575 || (type == MPEG2ADTS_AUDIO && mStreamType == 0x0f)) { 576 return mSource; 577 } 578 579 return NULL; 580} 581 582//////////////////////////////////////////////////////////////////////////////// 583 584ATSParser::ATSParser() { 585} 586 587ATSParser::~ATSParser() { 588} 589 590void ATSParser::feedTSPacket(const void *data, size_t size) { 591 CHECK_EQ(size, kTSPacketSize); 592 593 ABitReader br((const uint8_t *)data, kTSPacketSize); 594 parseTS(&br); 595} 596 597void ATSParser::signalDiscontinuity(DiscontinuityType type) { 598 for (size_t i = 0; i < mPrograms.size(); ++i) { 599 mPrograms.editItemAt(i)->signalDiscontinuity(type); 600 } 601} 602 603void ATSParser::signalEOS(status_t finalResult) { 604 CHECK_NE(finalResult, (status_t)OK); 605 606 for (size_t i = 0; i < mPrograms.size(); ++i) { 607 mPrograms.editItemAt(i)->signalEOS(finalResult); 608 } 609} 610 611void ATSParser::parseProgramAssociationTable(ABitReader *br) { 612 unsigned table_id = br->getBits(8); 613 LOGV(" table_id = %u", table_id); 614 CHECK_EQ(table_id, 0x00u); 615 616 unsigned section_syntax_indictor = br->getBits(1); 617 LOGV(" section_syntax_indictor = %u", section_syntax_indictor); 618 CHECK_EQ(section_syntax_indictor, 1u); 619 620 CHECK_EQ(br->getBits(1), 0u); 621 MY_LOGV(" reserved = %u", br->getBits(2)); 622 623 unsigned section_length = br->getBits(12); 624 LOGV(" section_length = %u", section_length); 625 CHECK_EQ(section_length & 0xc00, 0u); 626 627 MY_LOGV(" transport_stream_id = %u", br->getBits(16)); 628 MY_LOGV(" reserved = %u", br->getBits(2)); 629 MY_LOGV(" version_number = %u", br->getBits(5)); 630 MY_LOGV(" current_next_indicator = %u", br->getBits(1)); 631 MY_LOGV(" section_number = %u", br->getBits(8)); 632 MY_LOGV(" last_section_number = %u", br->getBits(8)); 633 634 size_t numProgramBytes = (section_length - 5 /* header */ - 4 /* crc */); 635 CHECK_EQ((numProgramBytes % 4), 0u); 636 637 for (size_t i = 0; i < numProgramBytes / 4; ++i) { 638 unsigned program_number = br->getBits(16); 639 LOGV(" program_number = %u", program_number); 640 641 MY_LOGV(" reserved = %u", br->getBits(3)); 642 643 if (program_number == 0) { 644 MY_LOGV(" network_PID = 0x%04x", br->getBits(13)); 645 } else { 646 unsigned programMapPID = br->getBits(13); 647 648 LOGV(" program_map_PID = 0x%04x", programMapPID); 649 650 mPrograms.push(new Program(this, programMapPID)); 651 } 652 } 653 654 MY_LOGV(" CRC = 0x%08x", br->getBits(32)); 655} 656 657void ATSParser::parsePID( 658 ABitReader *br, unsigned PID, 659 unsigned payload_unit_start_indicator) { 660 if (PID == 0) { 661 if (payload_unit_start_indicator) { 662 unsigned skip = br->getBits(8); 663 br->skipBits(skip * 8); 664 } 665 parseProgramAssociationTable(br); 666 return; 667 } 668 669 bool handled = false; 670 for (size_t i = 0; i < mPrograms.size(); ++i) { 671 if (mPrograms.editItemAt(i)->parsePID( 672 PID, payload_unit_start_indicator, br)) { 673 handled = true; 674 break; 675 } 676 } 677 678 if (!handled) { 679 LOGV("PID 0x%04x not handled.", PID); 680 } 681} 682 683void ATSParser::parseAdaptationField(ABitReader *br) { 684 unsigned adaptation_field_length = br->getBits(8); 685 if (adaptation_field_length > 0) { 686 br->skipBits(adaptation_field_length * 8); // XXX 687 } 688} 689 690void ATSParser::parseTS(ABitReader *br) { 691 LOGV("---"); 692 693 unsigned sync_byte = br->getBits(8); 694 CHECK_EQ(sync_byte, 0x47u); 695 696 MY_LOGV("transport_error_indicator = %u", br->getBits(1)); 697 698 unsigned payload_unit_start_indicator = br->getBits(1); 699 LOGV("payload_unit_start_indicator = %u", payload_unit_start_indicator); 700 701 MY_LOGV("transport_priority = %u", br->getBits(1)); 702 703 unsigned PID = br->getBits(13); 704 LOGV("PID = 0x%04x", PID); 705 706 MY_LOGV("transport_scrambling_control = %u", br->getBits(2)); 707 708 unsigned adaptation_field_control = br->getBits(2); 709 LOGV("adaptation_field_control = %u", adaptation_field_control); 710 711 unsigned continuity_counter = br->getBits(4); 712 LOGV("continuity_counter = %u", continuity_counter); 713 714 // LOGI("PID = 0x%04x, continuity_counter = %u", PID, continuity_counter); 715 716 if (adaptation_field_control == 2 || adaptation_field_control == 3) { 717 parseAdaptationField(br); 718 } 719 720 if (adaptation_field_control == 1 || adaptation_field_control == 3) { 721 parsePID(br, PID, payload_unit_start_indicator); 722 } 723} 724 725sp<MediaSource> ATSParser::getSource(SourceType type) { 726 for (size_t i = 0; i < mPrograms.size(); ++i) { 727 sp<MediaSource> source = mPrograms.editItemAt(i)->getSource(type); 728 729 if (source != NULL) { 730 return source; 731 } 732 } 733 734 return NULL; 735} 736 737} // namespace android 738