PlaylistFetcher.cpp revision fef808d42a9c94b0b5ef3c3d5fb0a090edbc42da
1/* 2 * Copyright (C) 2012 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 "PlaylistFetcher" 19#include <utils/Log.h> 20 21#include "PlaylistFetcher.h" 22 23#include "LiveDataSource.h" 24#include "LiveSession.h" 25#include "M3UParser.h" 26 27#include "include/avc_utils.h" 28#include "include/HTTPBase.h" 29#include "include/ID3.h" 30#include "mpeg2ts/AnotherPacketSource.h" 31 32#include <media/IStreamSource.h> 33#include <media/stagefright/foundation/ABitReader.h> 34#include <media/stagefright/foundation/ABuffer.h> 35#include <media/stagefright/foundation/ADebug.h> 36#include <media/stagefright/foundation/hexdump.h> 37#include <media/stagefright/FileSource.h> 38#include <media/stagefright/MediaDefs.h> 39#include <media/stagefright/MetaData.h> 40#include <media/stagefright/Utils.h> 41 42#include <ctype.h> 43#include <inttypes.h> 44#include <openssl/aes.h> 45#include <openssl/md5.h> 46 47namespace android { 48 49// static 50const int64_t PlaylistFetcher::kMinBufferedDurationUs = 10000000ll; 51const int64_t PlaylistFetcher::kMaxMonitorDelayUs = 3000000ll; 52const int32_t PlaylistFetcher::kDownloadBlockSize = 2048; 53const int32_t PlaylistFetcher::kNumSkipFrames = 10; 54 55PlaylistFetcher::PlaylistFetcher( 56 const sp<AMessage> ¬ify, 57 const sp<LiveSession> &session, 58 const char *uri, 59 int32_t subtitleGeneration) 60 : mNotify(notify), 61 mStartTimeUsNotify(notify->dup()), 62 mSession(session), 63 mURI(uri), 64 mStreamTypeMask(0), 65 mStartTimeUs(-1ll), 66 mSegmentStartTimeUs(-1ll), 67 mDiscontinuitySeq(-1ll), 68 mStartTimeUsRelative(false), 69 mLastPlaylistFetchTimeUs(-1ll), 70 mSeqNumber(-1), 71 mNumRetries(0), 72 mStartup(true), 73 mAdaptive(false), 74 mPrepared(false), 75 mNextPTSTimeUs(-1ll), 76 mMonitorQueueGeneration(0), 77 mSubtitleGeneration(subtitleGeneration), 78 mRefreshState(INITIAL_MINIMUM_RELOAD_DELAY), 79 mFirstPTSValid(false), 80 mAbsoluteTimeAnchorUs(0ll), 81 mVideoBuffer(new AnotherPacketSource(NULL)) { 82 memset(mPlaylistHash, 0, sizeof(mPlaylistHash)); 83 mStartTimeUsNotify->setInt32("what", kWhatStartedAt); 84 mStartTimeUsNotify->setInt32("streamMask", 0); 85} 86 87PlaylistFetcher::~PlaylistFetcher() { 88} 89 90int64_t PlaylistFetcher::getSegmentStartTimeUs(int32_t seqNumber) const { 91 CHECK(mPlaylist != NULL); 92 93 int32_t firstSeqNumberInPlaylist; 94 if (mPlaylist->meta() == NULL || !mPlaylist->meta()->findInt32( 95 "media-sequence", &firstSeqNumberInPlaylist)) { 96 firstSeqNumberInPlaylist = 0; 97 } 98 99 int32_t lastSeqNumberInPlaylist = 100 firstSeqNumberInPlaylist + (int32_t)mPlaylist->size() - 1; 101 102 CHECK_GE(seqNumber, firstSeqNumberInPlaylist); 103 CHECK_LE(seqNumber, lastSeqNumberInPlaylist); 104 105 int64_t segmentStartUs = 0ll; 106 for (int32_t index = 0; 107 index < seqNumber - firstSeqNumberInPlaylist; ++index) { 108 sp<AMessage> itemMeta; 109 CHECK(mPlaylist->itemAt( 110 index, NULL /* uri */, &itemMeta)); 111 112 int64_t itemDurationUs; 113 CHECK(itemMeta->findInt64("durationUs", &itemDurationUs)); 114 115 segmentStartUs += itemDurationUs; 116 } 117 118 return segmentStartUs; 119} 120 121int64_t PlaylistFetcher::delayUsToRefreshPlaylist() const { 122 int64_t nowUs = ALooper::GetNowUs(); 123 124 if (mPlaylist == NULL || mLastPlaylistFetchTimeUs < 0ll) { 125 CHECK_EQ((int)mRefreshState, (int)INITIAL_MINIMUM_RELOAD_DELAY); 126 return 0ll; 127 } 128 129 if (mPlaylist->isComplete()) { 130 return (~0llu >> 1); 131 } 132 133 int32_t targetDurationSecs; 134 CHECK(mPlaylist->meta()->findInt32("target-duration", &targetDurationSecs)); 135 136 int64_t targetDurationUs = targetDurationSecs * 1000000ll; 137 138 int64_t minPlaylistAgeUs; 139 140 switch (mRefreshState) { 141 case INITIAL_MINIMUM_RELOAD_DELAY: 142 { 143 size_t n = mPlaylist->size(); 144 if (n > 0) { 145 sp<AMessage> itemMeta; 146 CHECK(mPlaylist->itemAt(n - 1, NULL /* uri */, &itemMeta)); 147 148 int64_t itemDurationUs; 149 CHECK(itemMeta->findInt64("durationUs", &itemDurationUs)); 150 151 minPlaylistAgeUs = itemDurationUs; 152 break; 153 } 154 155 // fall through 156 } 157 158 case FIRST_UNCHANGED_RELOAD_ATTEMPT: 159 { 160 minPlaylistAgeUs = targetDurationUs / 2; 161 break; 162 } 163 164 case SECOND_UNCHANGED_RELOAD_ATTEMPT: 165 { 166 minPlaylistAgeUs = (targetDurationUs * 3) / 2; 167 break; 168 } 169 170 case THIRD_UNCHANGED_RELOAD_ATTEMPT: 171 { 172 minPlaylistAgeUs = targetDurationUs * 3; 173 break; 174 } 175 176 default: 177 TRESPASS(); 178 break; 179 } 180 181 int64_t delayUs = mLastPlaylistFetchTimeUs + minPlaylistAgeUs - nowUs; 182 return delayUs > 0ll ? delayUs : 0ll; 183} 184 185status_t PlaylistFetcher::decryptBuffer( 186 size_t playlistIndex, const sp<ABuffer> &buffer, 187 bool first) { 188 sp<AMessage> itemMeta; 189 bool found = false; 190 AString method; 191 192 for (ssize_t i = playlistIndex; i >= 0; --i) { 193 AString uri; 194 CHECK(mPlaylist->itemAt(i, &uri, &itemMeta)); 195 196 if (itemMeta->findString("cipher-method", &method)) { 197 found = true; 198 break; 199 } 200 } 201 202 if (!found) { 203 method = "NONE"; 204 } 205 buffer->meta()->setString("cipher-method", method.c_str()); 206 207 if (method == "NONE") { 208 return OK; 209 } else if (!(method == "AES-128")) { 210 ALOGE("Unsupported cipher method '%s'", method.c_str()); 211 return ERROR_UNSUPPORTED; 212 } 213 214 AString keyURI; 215 if (!itemMeta->findString("cipher-uri", &keyURI)) { 216 ALOGE("Missing key uri"); 217 return ERROR_MALFORMED; 218 } 219 220 ssize_t index = mAESKeyForURI.indexOfKey(keyURI); 221 222 sp<ABuffer> key; 223 if (index >= 0) { 224 key = mAESKeyForURI.valueAt(index); 225 } else { 226 ssize_t err = mSession->fetchFile(keyURI.c_str(), &key); 227 228 if (err < 0) { 229 ALOGE("failed to fetch cipher key from '%s'.", keyURI.c_str()); 230 return ERROR_IO; 231 } else if (key->size() != 16) { 232 ALOGE("key file '%s' wasn't 16 bytes in size.", keyURI.c_str()); 233 return ERROR_MALFORMED; 234 } 235 236 mAESKeyForURI.add(keyURI, key); 237 } 238 239 AES_KEY aes_key; 240 if (AES_set_decrypt_key(key->data(), 128, &aes_key) != 0) { 241 ALOGE("failed to set AES decryption key."); 242 return UNKNOWN_ERROR; 243 } 244 245 size_t n = buffer->size(); 246 if (!n) { 247 return OK; 248 } 249 CHECK(n % 16 == 0); 250 251 if (first) { 252 // If decrypting the first block in a file, read the iv from the manifest 253 // or derive the iv from the file's sequence number. 254 255 AString iv; 256 if (itemMeta->findString("cipher-iv", &iv)) { 257 if ((!iv.startsWith("0x") && !iv.startsWith("0X")) 258 || iv.size() != 16 * 2 + 2) { 259 ALOGE("malformed cipher IV '%s'.", iv.c_str()); 260 return ERROR_MALFORMED; 261 } 262 263 memset(mAESInitVec, 0, sizeof(mAESInitVec)); 264 for (size_t i = 0; i < 16; ++i) { 265 char c1 = tolower(iv.c_str()[2 + 2 * i]); 266 char c2 = tolower(iv.c_str()[3 + 2 * i]); 267 if (!isxdigit(c1) || !isxdigit(c2)) { 268 ALOGE("malformed cipher IV '%s'.", iv.c_str()); 269 return ERROR_MALFORMED; 270 } 271 uint8_t nibble1 = isdigit(c1) ? c1 - '0' : c1 - 'a' + 10; 272 uint8_t nibble2 = isdigit(c2) ? c2 - '0' : c2 - 'a' + 10; 273 274 mAESInitVec[i] = nibble1 << 4 | nibble2; 275 } 276 } else { 277 memset(mAESInitVec, 0, sizeof(mAESInitVec)); 278 mAESInitVec[15] = mSeqNumber & 0xff; 279 mAESInitVec[14] = (mSeqNumber >> 8) & 0xff; 280 mAESInitVec[13] = (mSeqNumber >> 16) & 0xff; 281 mAESInitVec[12] = (mSeqNumber >> 24) & 0xff; 282 } 283 } 284 285 AES_cbc_encrypt( 286 buffer->data(), buffer->data(), buffer->size(), 287 &aes_key, mAESInitVec, AES_DECRYPT); 288 289 return OK; 290} 291 292status_t PlaylistFetcher::checkDecryptPadding(const sp<ABuffer> &buffer) { 293 status_t err; 294 AString method; 295 CHECK(buffer->meta()->findString("cipher-method", &method)); 296 if (method == "NONE") { 297 return OK; 298 } 299 300 uint8_t padding = 0; 301 if (buffer->size() > 0) { 302 padding = buffer->data()[buffer->size() - 1]; 303 } 304 305 if (padding > 16) { 306 return ERROR_MALFORMED; 307 } 308 309 for (size_t i = buffer->size() - padding; i < padding; i++) { 310 if (buffer->data()[i] != padding) { 311 return ERROR_MALFORMED; 312 } 313 } 314 315 buffer->setRange(buffer->offset(), buffer->size() - padding); 316 return OK; 317} 318 319void PlaylistFetcher::postMonitorQueue(int64_t delayUs, int64_t minDelayUs) { 320 int64_t maxDelayUs = delayUsToRefreshPlaylist(); 321 if (maxDelayUs < minDelayUs) { 322 maxDelayUs = minDelayUs; 323 } 324 if (delayUs > maxDelayUs) { 325 ALOGV("Need to refresh playlist in %" PRId64 , maxDelayUs); 326 delayUs = maxDelayUs; 327 } 328 sp<AMessage> msg = new AMessage(kWhatMonitorQueue, id()); 329 msg->setInt32("generation", mMonitorQueueGeneration); 330 msg->post(delayUs); 331} 332 333void PlaylistFetcher::cancelMonitorQueue() { 334 ++mMonitorQueueGeneration; 335} 336 337void PlaylistFetcher::startAsync( 338 const sp<AnotherPacketSource> &audioSource, 339 const sp<AnotherPacketSource> &videoSource, 340 const sp<AnotherPacketSource> &subtitleSource, 341 int64_t startTimeUs, 342 int64_t segmentStartTimeUs, 343 int32_t startDiscontinuitySeq, 344 bool adaptive) { 345 sp<AMessage> msg = new AMessage(kWhatStart, id()); 346 347 uint32_t streamTypeMask = 0ul; 348 349 if (audioSource != NULL) { 350 msg->setPointer("audioSource", audioSource.get()); 351 streamTypeMask |= LiveSession::STREAMTYPE_AUDIO; 352 } 353 354 if (videoSource != NULL) { 355 msg->setPointer("videoSource", videoSource.get()); 356 streamTypeMask |= LiveSession::STREAMTYPE_VIDEO; 357 } 358 359 if (subtitleSource != NULL) { 360 msg->setPointer("subtitleSource", subtitleSource.get()); 361 streamTypeMask |= LiveSession::STREAMTYPE_SUBTITLES; 362 } 363 364 msg->setInt32("streamTypeMask", streamTypeMask); 365 msg->setInt64("startTimeUs", startTimeUs); 366 msg->setInt64("segmentStartTimeUs", segmentStartTimeUs); 367 msg->setInt32("startDiscontinuitySeq", startDiscontinuitySeq); 368 msg->setInt32("adaptive", adaptive); 369 msg->post(); 370} 371 372void PlaylistFetcher::pauseAsync() { 373 (new AMessage(kWhatPause, id()))->post(); 374} 375 376void PlaylistFetcher::stopAsync(bool clear) { 377 sp<AMessage> msg = new AMessage(kWhatStop, id()); 378 msg->setInt32("clear", clear); 379 msg->post(); 380} 381 382void PlaylistFetcher::resumeUntilAsync(const sp<AMessage> ¶ms) { 383 AMessage* msg = new AMessage(kWhatResumeUntil, id()); 384 msg->setMessage("params", params); 385 msg->post(); 386} 387 388void PlaylistFetcher::onMessageReceived(const sp<AMessage> &msg) { 389 switch (msg->what()) { 390 case kWhatStart: 391 { 392 status_t err = onStart(msg); 393 394 sp<AMessage> notify = mNotify->dup(); 395 notify->setInt32("what", kWhatStarted); 396 notify->setInt32("err", err); 397 notify->post(); 398 break; 399 } 400 401 case kWhatPause: 402 { 403 onPause(); 404 405 sp<AMessage> notify = mNotify->dup(); 406 notify->setInt32("what", kWhatPaused); 407 notify->post(); 408 break; 409 } 410 411 case kWhatStop: 412 { 413 onStop(msg); 414 415 sp<AMessage> notify = mNotify->dup(); 416 notify->setInt32("what", kWhatStopped); 417 notify->post(); 418 break; 419 } 420 421 case kWhatMonitorQueue: 422 case kWhatDownloadNext: 423 { 424 int32_t generation; 425 CHECK(msg->findInt32("generation", &generation)); 426 427 if (generation != mMonitorQueueGeneration) { 428 // Stale event 429 break; 430 } 431 432 if (msg->what() == kWhatMonitorQueue) { 433 onMonitorQueue(); 434 } else { 435 onDownloadNext(); 436 } 437 break; 438 } 439 440 case kWhatResumeUntil: 441 { 442 onResumeUntil(msg); 443 break; 444 } 445 446 default: 447 TRESPASS(); 448 } 449} 450 451status_t PlaylistFetcher::onStart(const sp<AMessage> &msg) { 452 mPacketSources.clear(); 453 454 uint32_t streamTypeMask; 455 CHECK(msg->findInt32("streamTypeMask", (int32_t *)&streamTypeMask)); 456 457 int64_t startTimeUs; 458 int64_t segmentStartTimeUs; 459 int32_t startDiscontinuitySeq; 460 int32_t adaptive; 461 CHECK(msg->findInt64("startTimeUs", &startTimeUs)); 462 CHECK(msg->findInt64("segmentStartTimeUs", &segmentStartTimeUs)); 463 CHECK(msg->findInt32("startDiscontinuitySeq", &startDiscontinuitySeq)); 464 CHECK(msg->findInt32("adaptive", &adaptive)); 465 466 if (streamTypeMask & LiveSession::STREAMTYPE_AUDIO) { 467 void *ptr; 468 CHECK(msg->findPointer("audioSource", &ptr)); 469 470 mPacketSources.add( 471 LiveSession::STREAMTYPE_AUDIO, 472 static_cast<AnotherPacketSource *>(ptr)); 473 } 474 475 if (streamTypeMask & LiveSession::STREAMTYPE_VIDEO) { 476 void *ptr; 477 CHECK(msg->findPointer("videoSource", &ptr)); 478 479 mPacketSources.add( 480 LiveSession::STREAMTYPE_VIDEO, 481 static_cast<AnotherPacketSource *>(ptr)); 482 } 483 484 if (streamTypeMask & LiveSession::STREAMTYPE_SUBTITLES) { 485 void *ptr; 486 CHECK(msg->findPointer("subtitleSource", &ptr)); 487 488 mPacketSources.add( 489 LiveSession::STREAMTYPE_SUBTITLES, 490 static_cast<AnotherPacketSource *>(ptr)); 491 } 492 493 mStreamTypeMask = streamTypeMask; 494 495 mSegmentStartTimeUs = segmentStartTimeUs; 496 mDiscontinuitySeq = startDiscontinuitySeq; 497 498 if (startTimeUs >= 0) { 499 mStartTimeUs = startTimeUs; 500 mSeqNumber = -1; 501 mStartup = true; 502 mPrepared = false; 503 mAdaptive = adaptive; 504 } 505 506 postMonitorQueue(); 507 508 return OK; 509} 510 511void PlaylistFetcher::onPause() { 512 cancelMonitorQueue(); 513} 514 515void PlaylistFetcher::onStop(const sp<AMessage> &msg) { 516 cancelMonitorQueue(); 517 518 int32_t clear; 519 CHECK(msg->findInt32("clear", &clear)); 520 if (clear) { 521 for (size_t i = 0; i < mPacketSources.size(); i++) { 522 sp<AnotherPacketSource> packetSource = mPacketSources.valueAt(i); 523 packetSource->clear(); 524 } 525 } 526 527 mPacketSources.clear(); 528 mStreamTypeMask = 0; 529} 530 531// Resume until we have reached the boundary timestamps listed in `msg`; when 532// the remaining time is too short (within a resume threshold) stop immediately 533// instead. 534status_t PlaylistFetcher::onResumeUntil(const sp<AMessage> &msg) { 535 sp<AMessage> params; 536 CHECK(msg->findMessage("params", ¶ms)); 537 538 bool stop = false; 539 for (size_t i = 0; i < mPacketSources.size(); i++) { 540 sp<AnotherPacketSource> packetSource = mPacketSources.valueAt(i); 541 542 const char *stopKey; 543 int streamType = mPacketSources.keyAt(i); 544 switch (streamType) { 545 case LiveSession::STREAMTYPE_VIDEO: 546 stopKey = "timeUsVideo"; 547 break; 548 549 case LiveSession::STREAMTYPE_AUDIO: 550 stopKey = "timeUsAudio"; 551 break; 552 553 case LiveSession::STREAMTYPE_SUBTITLES: 554 stopKey = "timeUsSubtitle"; 555 break; 556 557 default: 558 TRESPASS(); 559 } 560 561 // Don't resume if we would stop within a resume threshold. 562 int32_t discontinuitySeq; 563 int64_t latestTimeUs = 0, stopTimeUs = 0; 564 sp<AMessage> latestMeta = packetSource->getLatestDequeuedMeta(); 565 if (latestMeta != NULL 566 && latestMeta->findInt32("discontinuitySeq", &discontinuitySeq) 567 && discontinuitySeq == mDiscontinuitySeq 568 && latestMeta->findInt64("timeUs", &latestTimeUs) 569 && params->findInt64(stopKey, &stopTimeUs) 570 && stopTimeUs - latestTimeUs < resumeThreshold(latestMeta)) { 571 stop = true; 572 } 573 } 574 575 if (stop) { 576 for (size_t i = 0; i < mPacketSources.size(); i++) { 577 mPacketSources.valueAt(i)->queueAccessUnit(mSession->createFormatChangeBuffer()); 578 } 579 stopAsync(/* clear = */ false); 580 return OK; 581 } 582 583 mStopParams = params; 584 postMonitorQueue(); 585 586 return OK; 587} 588 589void PlaylistFetcher::notifyError(status_t err) { 590 sp<AMessage> notify = mNotify->dup(); 591 notify->setInt32("what", kWhatError); 592 notify->setInt32("err", err); 593 notify->post(); 594} 595 596void PlaylistFetcher::queueDiscontinuity( 597 ATSParser::DiscontinuityType type, const sp<AMessage> &extra) { 598 for (size_t i = 0; i < mPacketSources.size(); ++i) { 599 // do not discard buffer upon #EXT-X-DISCONTINUITY tag 600 // (seek will discard buffer by abandoning old fetchers) 601 mPacketSources.valueAt(i)->queueDiscontinuity( 602 type, extra, false /* discard */); 603 } 604} 605 606void PlaylistFetcher::onMonitorQueue() { 607 bool downloadMore = false; 608 refreshPlaylist(); 609 610 int32_t targetDurationSecs; 611 int64_t targetDurationUs = kMinBufferedDurationUs; 612 if (mPlaylist != NULL) { 613 CHECK(mPlaylist->meta()->findInt32("target-duration", &targetDurationSecs)); 614 targetDurationUs = targetDurationSecs * 1000000ll; 615 } 616 617 // buffer at least 3 times the target duration, or up to 10 seconds 618 int64_t durationToBufferUs = targetDurationUs * 3; 619 if (durationToBufferUs > kMinBufferedDurationUs) { 620 durationToBufferUs = kMinBufferedDurationUs; 621 } 622 623 int64_t bufferedDurationUs = 0ll; 624 status_t finalResult = NOT_ENOUGH_DATA; 625 if (mStreamTypeMask == LiveSession::STREAMTYPE_SUBTITLES) { 626 sp<AnotherPacketSource> packetSource = 627 mPacketSources.valueFor(LiveSession::STREAMTYPE_SUBTITLES); 628 629 bufferedDurationUs = 630 packetSource->getBufferedDurationUs(&finalResult); 631 finalResult = OK; 632 } else { 633 // Use max stream duration to prevent us from waiting on a non-existent stream; 634 // when we cannot make out from the manifest what streams are included in a playlist 635 // we might assume extra streams. 636 for (size_t i = 0; i < mPacketSources.size(); ++i) { 637 if ((mStreamTypeMask & mPacketSources.keyAt(i)) == 0) { 638 continue; 639 } 640 641 int64_t bufferedStreamDurationUs = 642 mPacketSources.valueAt(i)->getBufferedDurationUs(&finalResult); 643 ALOGV("buffered %" PRId64 " for stream %d", 644 bufferedStreamDurationUs, mPacketSources.keyAt(i)); 645 if (bufferedStreamDurationUs > bufferedDurationUs) { 646 bufferedDurationUs = bufferedStreamDurationUs; 647 } 648 } 649 } 650 downloadMore = (bufferedDurationUs < durationToBufferUs); 651 652 // signal start if buffered up at least the target size 653 if (!mPrepared && bufferedDurationUs > targetDurationUs && downloadMore) { 654 mPrepared = true; 655 656 ALOGV("prepared, buffered=%" PRId64 " > %" PRId64 "", 657 bufferedDurationUs, targetDurationUs); 658 sp<AMessage> msg = mNotify->dup(); 659 msg->setInt32("what", kWhatTemporarilyDoneFetching); 660 msg->post(); 661 } 662 663 if (finalResult == OK && downloadMore) { 664 ALOGV("monitoring, buffered=%" PRId64 " < %" PRId64 "", 665 bufferedDurationUs, durationToBufferUs); 666 // delay the next download slightly; hopefully this gives other concurrent fetchers 667 // a better chance to run. 668 // onDownloadNext(); 669 sp<AMessage> msg = new AMessage(kWhatDownloadNext, id()); 670 msg->setInt32("generation", mMonitorQueueGeneration); 671 msg->post(1000l); 672 } else { 673 // Nothing to do yet, try again in a second. 674 675 sp<AMessage> msg = mNotify->dup(); 676 msg->setInt32("what", kWhatTemporarilyDoneFetching); 677 msg->post(); 678 679 int64_t delayUs = mPrepared ? kMaxMonitorDelayUs : targetDurationUs / 2; 680 ALOGV("pausing for %" PRId64 ", buffered=%" PRId64 " > %" PRId64 "", 681 delayUs, bufferedDurationUs, durationToBufferUs); 682 // :TRICKY: need to enforce minimum delay because the delay to 683 // refresh the playlist will become 0 684 postMonitorQueue(delayUs, mPrepared ? targetDurationUs * 2 : 0); 685 } 686} 687 688status_t PlaylistFetcher::refreshPlaylist() { 689 if (delayUsToRefreshPlaylist() <= 0) { 690 bool unchanged; 691 sp<M3UParser> playlist = mSession->fetchPlaylist( 692 mURI.c_str(), mPlaylistHash, &unchanged); 693 694 if (playlist == NULL) { 695 if (unchanged) { 696 // We succeeded in fetching the playlist, but it was 697 // unchanged from the last time we tried. 698 699 if (mRefreshState != THIRD_UNCHANGED_RELOAD_ATTEMPT) { 700 mRefreshState = (RefreshState)(mRefreshState + 1); 701 } 702 } else { 703 ALOGE("failed to load playlist at url '%s'", mURI.c_str()); 704 notifyError(ERROR_IO); 705 return ERROR_IO; 706 } 707 } else { 708 mRefreshState = INITIAL_MINIMUM_RELOAD_DELAY; 709 mPlaylist = playlist; 710 711 if (mPlaylist->isComplete() || mPlaylist->isEvent()) { 712 updateDuration(); 713 } 714 } 715 716 mLastPlaylistFetchTimeUs = ALooper::GetNowUs(); 717 } 718 return OK; 719} 720 721// static 722bool PlaylistFetcher::bufferStartsWithTsSyncByte(const sp<ABuffer>& buffer) { 723 return buffer->size() > 0 && buffer->data()[0] == 0x47; 724} 725 726void PlaylistFetcher::onDownloadNext() { 727 if (refreshPlaylist() != OK) { 728 return; 729 } 730 731 int32_t firstSeqNumberInPlaylist; 732 if (mPlaylist->meta() == NULL || !mPlaylist->meta()->findInt32( 733 "media-sequence", &firstSeqNumberInPlaylist)) { 734 firstSeqNumberInPlaylist = 0; 735 } 736 737 bool discontinuity = false; 738 739 const int32_t lastSeqNumberInPlaylist = 740 firstSeqNumberInPlaylist + (int32_t)mPlaylist->size() - 1; 741 742 if (mDiscontinuitySeq < 0) { 743 mDiscontinuitySeq = mPlaylist->getDiscontinuitySeq(); 744 } 745 746 if (mSeqNumber < 0) { 747 CHECK_GE(mStartTimeUs, 0ll); 748 749 if (mSegmentStartTimeUs < 0) { 750 if (!mPlaylist->isComplete() && !mPlaylist->isEvent()) { 751 // If this is a live session, start 3 segments from the end on connect 752 mSeqNumber = lastSeqNumberInPlaylist - 3; 753 if (mSeqNumber < firstSeqNumberInPlaylist) { 754 mSeqNumber = firstSeqNumberInPlaylist; 755 } 756 } else { 757 mSeqNumber = getSeqNumberForTime(mStartTimeUs); 758 mStartTimeUs -= getSegmentStartTimeUs(mSeqNumber); 759 } 760 mStartTimeUsRelative = true; 761 ALOGV("Initial sequence number for time %" PRId64 " is %d from (%d .. %d)", 762 mStartTimeUs, mSeqNumber, firstSeqNumberInPlaylist, 763 lastSeqNumberInPlaylist); 764 } else { 765 mSeqNumber = getSeqNumberForTime(mSegmentStartTimeUs); 766 if (mAdaptive) { 767 // avoid double fetch/decode 768 mSeqNumber += 1; 769 } 770 ssize_t minSeq = getSeqNumberForDiscontinuity(mDiscontinuitySeq); 771 if (mSeqNumber < minSeq) { 772 mSeqNumber = minSeq; 773 } 774 775 if (mSeqNumber < firstSeqNumberInPlaylist) { 776 mSeqNumber = firstSeqNumberInPlaylist; 777 } 778 779 if (mSeqNumber > lastSeqNumberInPlaylist) { 780 mSeqNumber = lastSeqNumberInPlaylist; 781 } 782 ALOGV("Initial sequence number for live event %d from (%d .. %d)", 783 mSeqNumber, firstSeqNumberInPlaylist, 784 lastSeqNumberInPlaylist); 785 } 786 } 787 788 if (mSeqNumber < firstSeqNumberInPlaylist 789 || mSeqNumber > lastSeqNumberInPlaylist) { 790 if (!mPlaylist->isComplete() && mNumRetries < kMaxNumRetries) { 791 ++mNumRetries; 792 793 if (mSeqNumber > lastSeqNumberInPlaylist) { 794 // refresh in increasing fraction (1/2, 1/3, ...) of the 795 // playlist's target duration or 3 seconds, whichever is less 796 int32_t targetDurationSecs; 797 CHECK(mPlaylist->meta()->findInt32( 798 "target-duration", &targetDurationSecs)); 799 int64_t delayUs = mPlaylist->size() * targetDurationSecs * 800 1000000ll / (1 + mNumRetries); 801 if (delayUs > kMaxMonitorDelayUs) { 802 delayUs = kMaxMonitorDelayUs; 803 } 804 ALOGV("sequence number high: %d from (%d .. %d), " 805 "monitor in %" PRId64 " (retry=%d)", 806 mSeqNumber, firstSeqNumberInPlaylist, 807 lastSeqNumberInPlaylist, delayUs, mNumRetries); 808 postMonitorQueue(delayUs); 809 return; 810 } 811 812 // we've missed the boat, let's start from the lowest sequence 813 // number available and signal a discontinuity. 814 815 ALOGI("We've missed the boat, restarting playback." 816 " mStartup=%d, was looking for %d in %d-%d", 817 mStartup, mSeqNumber, firstSeqNumberInPlaylist, 818 lastSeqNumberInPlaylist); 819 mSeqNumber = lastSeqNumberInPlaylist - 3; 820 if (mSeqNumber < firstSeqNumberInPlaylist) { 821 mSeqNumber = firstSeqNumberInPlaylist; 822 } 823 discontinuity = true; 824 825 // fall through 826 } else { 827 ALOGE("Cannot find sequence number %d in playlist " 828 "(contains %d - %d)", 829 mSeqNumber, firstSeqNumberInPlaylist, 830 firstSeqNumberInPlaylist + (int32_t)mPlaylist->size() - 1); 831 832 notifyError(ERROR_END_OF_STREAM); 833 return; 834 } 835 } 836 837 mNumRetries = 0; 838 839 AString uri; 840 sp<AMessage> itemMeta; 841 CHECK(mPlaylist->itemAt( 842 mSeqNumber - firstSeqNumberInPlaylist, 843 &uri, 844 &itemMeta)); 845 846 int32_t val; 847 if (itemMeta->findInt32("discontinuity", &val) && val != 0) { 848 mDiscontinuitySeq++; 849 discontinuity = true; 850 } 851 852 int64_t range_offset, range_length; 853 if (!itemMeta->findInt64("range-offset", &range_offset) 854 || !itemMeta->findInt64("range-length", &range_length)) { 855 range_offset = 0; 856 range_length = -1; 857 } 858 859 ALOGV("fetching segment %d from (%d .. %d)", 860 mSeqNumber, firstSeqNumberInPlaylist, lastSeqNumberInPlaylist); 861 862 ALOGV("fetching '%s'", uri.c_str()); 863 864 sp<DataSource> source; 865 sp<ABuffer> buffer, tsBuffer; 866 // decrypt a junk buffer to prefetch key; since a session uses only one http connection, 867 // this avoids interleaved connections to the key and segment file. 868 { 869 sp<ABuffer> junk = new ABuffer(16); 870 junk->setRange(0, 16); 871 status_t err = decryptBuffer(mSeqNumber - firstSeqNumberInPlaylist, junk, 872 true /* first */); 873 if (err != OK) { 874 notifyError(err); 875 return; 876 } 877 } 878 879 // block-wise download 880 bool startup = mStartup; 881 ssize_t bytesRead; 882 do { 883 bytesRead = mSession->fetchFile( 884 uri.c_str(), &buffer, range_offset, range_length, kDownloadBlockSize, &source); 885 886 if (bytesRead < 0) { 887 status_t err = bytesRead; 888 ALOGE("failed to fetch .ts segment at url '%s'", uri.c_str()); 889 notifyError(err); 890 return; 891 } 892 893 CHECK(buffer != NULL); 894 895 size_t size = buffer->size(); 896 // Set decryption range. 897 buffer->setRange(size - bytesRead, bytesRead); 898 status_t err = decryptBuffer(mSeqNumber - firstSeqNumberInPlaylist, buffer, 899 buffer->offset() == 0 /* first */); 900 // Unset decryption range. 901 buffer->setRange(0, size); 902 903 if (err != OK) { 904 ALOGE("decryptBuffer failed w/ error %d", err); 905 906 notifyError(err); 907 return; 908 } 909 910 if (startup || discontinuity) { 911 // Signal discontinuity. 912 913 if (mPlaylist->isComplete() || mPlaylist->isEvent()) { 914 // If this was a live event this made no sense since 915 // we don't have access to all the segment before the current 916 // one. 917 mNextPTSTimeUs = getSegmentStartTimeUs(mSeqNumber); 918 } 919 920 if (discontinuity) { 921 ALOGI("queueing discontinuity (explicit=%d)", discontinuity); 922 923 queueDiscontinuity( 924 ATSParser::DISCONTINUITY_FORMATCHANGE, 925 NULL /* extra */); 926 927 discontinuity = false; 928 } 929 930 startup = false; 931 } 932 933 err = OK; 934 if (bufferStartsWithTsSyncByte(buffer)) { 935 // Incremental extraction is only supported for MPEG2 transport streams. 936 if (tsBuffer == NULL) { 937 tsBuffer = new ABuffer(buffer->data(), buffer->capacity()); 938 tsBuffer->setRange(0, 0); 939 } else if (tsBuffer->capacity() != buffer->capacity()) { 940 size_t tsOff = tsBuffer->offset(), tsSize = tsBuffer->size(); 941 tsBuffer = new ABuffer(buffer->data(), buffer->capacity()); 942 tsBuffer->setRange(tsOff, tsSize); 943 } 944 tsBuffer->setRange(tsBuffer->offset(), tsBuffer->size() + bytesRead); 945 946 err = extractAndQueueAccessUnitsFromTs(tsBuffer); 947 } 948 949 if (err == -EAGAIN) { 950 // starting sequence number too low/high 951 mTSParser.clear(); 952 postMonitorQueue(); 953 return; 954 } else if (err == ERROR_OUT_OF_RANGE) { 955 // reached stopping point 956 stopAsync(/* clear = */ false); 957 return; 958 } else if (err != OK) { 959 notifyError(err); 960 return; 961 } 962 963 } while (bytesRead != 0); 964 965 if (bufferStartsWithTsSyncByte(buffer)) { 966 // If we still don't see a stream after fetching a full ts segment mark it as 967 // nonexistent. 968 const size_t kNumTypes = ATSParser::NUM_SOURCE_TYPES; 969 ATSParser::SourceType srcTypes[kNumTypes] = 970 { ATSParser::VIDEO, ATSParser::AUDIO }; 971 LiveSession::StreamType streamTypes[kNumTypes] = 972 { LiveSession::STREAMTYPE_VIDEO, LiveSession::STREAMTYPE_AUDIO }; 973 974 for (size_t i = 0; i < kNumTypes; i++) { 975 ATSParser::SourceType srcType = srcTypes[i]; 976 LiveSession::StreamType streamType = streamTypes[i]; 977 978 sp<AnotherPacketSource> source = 979 static_cast<AnotherPacketSource *>( 980 mTSParser->getSource(srcType).get()); 981 982 if (source == NULL) { 983 ALOGW("MPEG2 Transport stream does not contain %s data.", 984 srcType == ATSParser::VIDEO ? "video" : "audio"); 985 986 mStreamTypeMask &= ~streamType; 987 mPacketSources.removeItem(streamType); 988 } 989 } 990 991 } 992 993 if (checkDecryptPadding(buffer) != OK) { 994 ALOGE("Incorrect padding bytes after decryption."); 995 notifyError(ERROR_MALFORMED); 996 return; 997 } 998 999 status_t err = OK; 1000 if (tsBuffer != NULL) { 1001 AString method; 1002 CHECK(buffer->meta()->findString("cipher-method", &method)); 1003 if ((tsBuffer->size() > 0 && method == "NONE") 1004 || tsBuffer->size() > 16) { 1005 ALOGE("MPEG2 transport stream is not an even multiple of 188 " 1006 "bytes in length."); 1007 notifyError(ERROR_MALFORMED); 1008 return; 1009 } 1010 } 1011 1012 // bulk extract non-ts files 1013 if (tsBuffer == NULL) { 1014 err = extractAndQueueAccessUnits(buffer, itemMeta); 1015 if (err == -EAGAIN) { 1016 // starting sequence number too low/high 1017 postMonitorQueue(); 1018 return; 1019 } else if (err == ERROR_OUT_OF_RANGE) { 1020 // reached stopping point 1021 stopAsync(/* clear = */false); 1022 return; 1023 } 1024 } 1025 1026 if (err != OK) { 1027 notifyError(err); 1028 return; 1029 } 1030 1031 ++mSeqNumber; 1032 1033 postMonitorQueue(); 1034} 1035 1036int32_t PlaylistFetcher::getSeqNumberWithAnchorTime(int64_t anchorTimeUs) const { 1037 int32_t firstSeqNumberInPlaylist, lastSeqNumberInPlaylist; 1038 if (mPlaylist->meta() == NULL 1039 || !mPlaylist->meta()->findInt32("media-sequence", &firstSeqNumberInPlaylist)) { 1040 firstSeqNumberInPlaylist = 0; 1041 } 1042 lastSeqNumberInPlaylist = firstSeqNumberInPlaylist + mPlaylist->size() - 1; 1043 1044 int32_t index = mSeqNumber - firstSeqNumberInPlaylist - 1; 1045 while (index >= 0 && anchorTimeUs > mStartTimeUs) { 1046 sp<AMessage> itemMeta; 1047 CHECK(mPlaylist->itemAt(index, NULL /* uri */, &itemMeta)); 1048 1049 int64_t itemDurationUs; 1050 CHECK(itemMeta->findInt64("durationUs", &itemDurationUs)); 1051 1052 anchorTimeUs -= itemDurationUs; 1053 --index; 1054 } 1055 1056 int32_t newSeqNumber = firstSeqNumberInPlaylist + index + 1; 1057 if (newSeqNumber <= lastSeqNumberInPlaylist) { 1058 return newSeqNumber; 1059 } else { 1060 return lastSeqNumberInPlaylist; 1061 } 1062} 1063 1064int32_t PlaylistFetcher::getSeqNumberForDiscontinuity(size_t discontinuitySeq) const { 1065 int32_t firstSeqNumberInPlaylist; 1066 if (mPlaylist->meta() == NULL 1067 || !mPlaylist->meta()->findInt32("media-sequence", &firstSeqNumberInPlaylist)) { 1068 firstSeqNumberInPlaylist = 0; 1069 } 1070 1071 size_t curDiscontinuitySeq = mPlaylist->getDiscontinuitySeq(); 1072 if (discontinuitySeq < curDiscontinuitySeq) { 1073 return firstSeqNumberInPlaylist <= 0 ? 0 : (firstSeqNumberInPlaylist - 1); 1074 } 1075 1076 size_t index = 0; 1077 while (index < mPlaylist->size()) { 1078 sp<AMessage> itemMeta; 1079 CHECK(mPlaylist->itemAt( index, NULL /* uri */, &itemMeta)); 1080 1081 int64_t discontinuity; 1082 if (itemMeta->findInt64("discontinuity", &discontinuity)) { 1083 curDiscontinuitySeq++; 1084 } 1085 1086 if (curDiscontinuitySeq == discontinuitySeq) { 1087 return firstSeqNumberInPlaylist + index; 1088 } 1089 1090 ++index; 1091 } 1092 1093 return firstSeqNumberInPlaylist + mPlaylist->size(); 1094} 1095 1096int32_t PlaylistFetcher::getSeqNumberForTime(int64_t timeUs) const { 1097 int32_t firstSeqNumberInPlaylist; 1098 if (mPlaylist->meta() == NULL || !mPlaylist->meta()->findInt32( 1099 "media-sequence", &firstSeqNumberInPlaylist)) { 1100 firstSeqNumberInPlaylist = 0; 1101 } 1102 1103 size_t index = 0; 1104 int64_t segmentStartUs = 0; 1105 while (index < mPlaylist->size()) { 1106 sp<AMessage> itemMeta; 1107 CHECK(mPlaylist->itemAt( 1108 index, NULL /* uri */, &itemMeta)); 1109 1110 int64_t itemDurationUs; 1111 CHECK(itemMeta->findInt64("durationUs", &itemDurationUs)); 1112 1113 if (timeUs < segmentStartUs + itemDurationUs) { 1114 break; 1115 } 1116 1117 segmentStartUs += itemDurationUs; 1118 ++index; 1119 } 1120 1121 if (index >= mPlaylist->size()) { 1122 index = mPlaylist->size() - 1; 1123 } 1124 1125 return firstSeqNumberInPlaylist + index; 1126} 1127 1128const sp<ABuffer> &PlaylistFetcher::setAccessUnitProperties( 1129 const sp<ABuffer> &accessUnit, const sp<AnotherPacketSource> &source, bool discard) { 1130 sp<MetaData> format = source->getFormat(); 1131 if (format != NULL) { 1132 // for simplicity, store a reference to the format in each unit 1133 accessUnit->meta()->setObject("format", format); 1134 } 1135 1136 if (discard) { 1137 accessUnit->meta()->setInt32("discard", discard); 1138 } 1139 1140 accessUnit->meta()->setInt32("discontinuitySeq", mDiscontinuitySeq); 1141 accessUnit->meta()->setInt64("segmentStartTimeUs", getSegmentStartTimeUs(mSeqNumber)); 1142 return accessUnit; 1143} 1144 1145status_t PlaylistFetcher::extractAndQueueAccessUnitsFromTs(const sp<ABuffer> &buffer) { 1146 if (mTSParser == NULL) { 1147 // Use TS_TIMESTAMPS_ARE_ABSOLUTE so pts carry over between fetchers. 1148 mTSParser = new ATSParser(ATSParser::TS_TIMESTAMPS_ARE_ABSOLUTE); 1149 } 1150 1151 if (mNextPTSTimeUs >= 0ll) { 1152 sp<AMessage> extra = new AMessage; 1153 // Since we are using absolute timestamps, signal an offset of 0 to prevent 1154 // ATSParser from skewing the timestamps of access units. 1155 extra->setInt64(IStreamListener::kKeyMediaTimeUs, 0); 1156 1157 mTSParser->signalDiscontinuity( 1158 ATSParser::DISCONTINUITY_TIME, extra); 1159 1160 mAbsoluteTimeAnchorUs = mNextPTSTimeUs; 1161 mNextPTSTimeUs = -1ll; 1162 mFirstPTSValid = false; 1163 } 1164 1165 size_t offset = 0; 1166 while (offset + 188 <= buffer->size()) { 1167 status_t err = mTSParser->feedTSPacket(buffer->data() + offset, 188); 1168 1169 if (err != OK) { 1170 return err; 1171 } 1172 1173 offset += 188; 1174 } 1175 // setRange to indicate consumed bytes. 1176 buffer->setRange(buffer->offset() + offset, buffer->size() - offset); 1177 1178 status_t err = OK; 1179 for (size_t i = mPacketSources.size(); i-- > 0;) { 1180 sp<AnotherPacketSource> packetSource = mPacketSources.valueAt(i); 1181 1182 const char *key; 1183 ATSParser::SourceType type; 1184 const LiveSession::StreamType stream = mPacketSources.keyAt(i); 1185 switch (stream) { 1186 case LiveSession::STREAMTYPE_VIDEO: 1187 type = ATSParser::VIDEO; 1188 key = "timeUsVideo"; 1189 break; 1190 1191 case LiveSession::STREAMTYPE_AUDIO: 1192 type = ATSParser::AUDIO; 1193 key = "timeUsAudio"; 1194 break; 1195 1196 case LiveSession::STREAMTYPE_SUBTITLES: 1197 { 1198 ALOGE("MPEG2 Transport streams do not contain subtitles."); 1199 return ERROR_MALFORMED; 1200 break; 1201 } 1202 1203 default: 1204 TRESPASS(); 1205 } 1206 1207 sp<AnotherPacketSource> source = 1208 static_cast<AnotherPacketSource *>( 1209 mTSParser->getSource(type).get()); 1210 1211 if (source == NULL) { 1212 continue; 1213 } 1214 1215 int64_t timeUs; 1216 sp<ABuffer> accessUnit; 1217 status_t finalResult; 1218 while (source->hasBufferAvailable(&finalResult) 1219 && source->dequeueAccessUnit(&accessUnit) == OK) { 1220 1221 CHECK(accessUnit->meta()->findInt64("timeUs", &timeUs)); 1222 1223 if (mStartup) { 1224 if (!mFirstPTSValid) { 1225 mFirstTimeUs = timeUs; 1226 mFirstPTSValid = true; 1227 } 1228 if (mStartTimeUsRelative) { 1229 timeUs -= mFirstTimeUs; 1230 if (timeUs < 0) { 1231 timeUs = 0; 1232 } 1233 } 1234 1235 if (timeUs < mStartTimeUs) { 1236 // buffer up to the closest preceding IDR frame 1237 ALOGV("timeUs %" PRId64 " us < mStartTimeUs %" PRId64 " us", 1238 timeUs, mStartTimeUs); 1239 const char *mime; 1240 sp<MetaData> format = source->getFormat(); 1241 bool isAvc = false; 1242 if (format != NULL && format->findCString(kKeyMIMEType, &mime) 1243 && !strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AVC)) { 1244 isAvc = true; 1245 } 1246 if (isAvc && IsIDR(accessUnit)) { 1247 mVideoBuffer->clear(); 1248 } 1249 if (isAvc) { 1250 mVideoBuffer->queueAccessUnit(accessUnit); 1251 } 1252 1253 continue; 1254 } 1255 } 1256 1257 CHECK(accessUnit->meta()->findInt64("timeUs", &timeUs)); 1258 if (mStartTimeUsNotify != NULL && timeUs > mStartTimeUs) { 1259 1260 int32_t targetDurationSecs; 1261 CHECK(mPlaylist->meta()->findInt32("target-duration", &targetDurationSecs)); 1262 int64_t targetDurationUs = targetDurationSecs * 1000000ll; 1263 // mStartup 1264 // mStartup is true until we have queued a packet for all the streams 1265 // we are fetching. We queue packets whose timestamps are greater than 1266 // mStartTimeUs. 1267 // mSegmentStartTimeUs >= 0 1268 // mSegmentStartTimeUs is non-negative when adapting or switching tracks 1269 // timeUs - mStartTimeUs > targetDurationUs: 1270 // This and the 2 above conditions should only happen when adapting in a live 1271 // stream; the old fetcher has already fetched to mStartTimeUs; the new fetcher 1272 // would start fetching after timeUs, which should be greater than mStartTimeUs; 1273 // the old fetcher would then continue fetching data until timeUs. We don't want 1274 // timeUs to be too far ahead of mStartTimeUs because we want the old fetcher to 1275 // stop as early as possible. The definition of being "too far ahead" is 1276 // arbitrary; here we use targetDurationUs as threshold. 1277 if (mStartup && mSegmentStartTimeUs >= 0 1278 && timeUs - mStartTimeUs > targetDurationUs) { 1279 // we just guessed a starting timestamp that is too high when adapting in a 1280 // live stream; re-adjust based on the actual timestamp extracted from the 1281 // media segment; if we didn't move backward after the re-adjustment 1282 // (newSeqNumber), start at least 1 segment prior. 1283 int32_t newSeqNumber = getSeqNumberWithAnchorTime(timeUs); 1284 if (newSeqNumber >= mSeqNumber) { 1285 --mSeqNumber; 1286 } else { 1287 mSeqNumber = newSeqNumber; 1288 } 1289 mStartTimeUsNotify = mNotify->dup(); 1290 mStartTimeUsNotify->setInt32("what", kWhatStartedAt); 1291 return -EAGAIN; 1292 } 1293 1294 int32_t seq; 1295 if (!mStartTimeUsNotify->findInt32("discontinuitySeq", &seq)) { 1296 mStartTimeUsNotify->setInt32("discontinuitySeq", mDiscontinuitySeq); 1297 } 1298 int64_t startTimeUs; 1299 if (!mStartTimeUsNotify->findInt64(key, &startTimeUs)) { 1300 mStartTimeUsNotify->setInt64(key, timeUs); 1301 1302 uint32_t streamMask = 0; 1303 mStartTimeUsNotify->findInt32("streamMask", (int32_t *) &streamMask); 1304 streamMask |= mPacketSources.keyAt(i); 1305 mStartTimeUsNotify->setInt32("streamMask", streamMask); 1306 1307 if (streamMask == mStreamTypeMask) { 1308 mStartup = false; 1309 mStartTimeUsNotify->post(); 1310 mStartTimeUsNotify.clear(); 1311 } 1312 } 1313 } 1314 1315 if (mStopParams != NULL) { 1316 // Queue discontinuity in original stream. 1317 int32_t discontinuitySeq; 1318 int64_t stopTimeUs; 1319 if (!mStopParams->findInt32("discontinuitySeq", &discontinuitySeq) 1320 || discontinuitySeq > mDiscontinuitySeq 1321 || !mStopParams->findInt64(key, &stopTimeUs) 1322 || (discontinuitySeq == mDiscontinuitySeq 1323 && timeUs >= stopTimeUs)) { 1324 packetSource->queueAccessUnit(mSession->createFormatChangeBuffer()); 1325 mStreamTypeMask &= ~stream; 1326 mPacketSources.removeItemsAt(i); 1327 break; 1328 } 1329 } 1330 1331 // Note that we do NOT dequeue any discontinuities except for format change. 1332 if (stream == LiveSession::STREAMTYPE_VIDEO) { 1333 const bool discard = true; 1334 status_t status; 1335 while (mVideoBuffer->hasBufferAvailable(&status)) { 1336 sp<ABuffer> videoBuffer; 1337 mVideoBuffer->dequeueAccessUnit(&videoBuffer); 1338 setAccessUnitProperties(videoBuffer, source, discard); 1339 packetSource->queueAccessUnit(videoBuffer); 1340 } 1341 } 1342 1343 setAccessUnitProperties(accessUnit, source); 1344 packetSource->queueAccessUnit(accessUnit); 1345 } 1346 1347 if (err != OK) { 1348 break; 1349 } 1350 } 1351 1352 if (err != OK) { 1353 for (size_t i = mPacketSources.size(); i-- > 0;) { 1354 sp<AnotherPacketSource> packetSource = mPacketSources.valueAt(i); 1355 packetSource->clear(); 1356 } 1357 return err; 1358 } 1359 1360 if (!mStreamTypeMask) { 1361 // Signal gap is filled between original and new stream. 1362 ALOGV("ERROR OUT OF RANGE"); 1363 return ERROR_OUT_OF_RANGE; 1364 } 1365 1366 return OK; 1367} 1368 1369/* static */ 1370bool PlaylistFetcher::bufferStartsWithWebVTTMagicSequence( 1371 const sp<ABuffer> &buffer) { 1372 size_t pos = 0; 1373 1374 // skip possible BOM 1375 if (buffer->size() >= pos + 3 && 1376 !memcmp("\xef\xbb\xbf", buffer->data() + pos, 3)) { 1377 pos += 3; 1378 } 1379 1380 // accept WEBVTT followed by SPACE, TAB or (CR) LF 1381 if (buffer->size() < pos + 6 || 1382 memcmp("WEBVTT", buffer->data() + pos, 6)) { 1383 return false; 1384 } 1385 pos += 6; 1386 1387 if (buffer->size() == pos) { 1388 return true; 1389 } 1390 1391 uint8_t sep = buffer->data()[pos]; 1392 return sep == ' ' || sep == '\t' || sep == '\n' || sep == '\r'; 1393} 1394 1395status_t PlaylistFetcher::extractAndQueueAccessUnits( 1396 const sp<ABuffer> &buffer, const sp<AMessage> &itemMeta) { 1397 if (bufferStartsWithWebVTTMagicSequence(buffer)) { 1398 if (mStreamTypeMask != LiveSession::STREAMTYPE_SUBTITLES) { 1399 ALOGE("This stream only contains subtitles."); 1400 return ERROR_MALFORMED; 1401 } 1402 1403 const sp<AnotherPacketSource> packetSource = 1404 mPacketSources.valueFor(LiveSession::STREAMTYPE_SUBTITLES); 1405 1406 int64_t durationUs; 1407 CHECK(itemMeta->findInt64("durationUs", &durationUs)); 1408 buffer->meta()->setInt64("timeUs", getSegmentStartTimeUs(mSeqNumber)); 1409 buffer->meta()->setInt64("durationUs", durationUs); 1410 buffer->meta()->setInt64("segmentStartTimeUs", getSegmentStartTimeUs(mSeqNumber)); 1411 buffer->meta()->setInt32("discontinuitySeq", mDiscontinuitySeq); 1412 buffer->meta()->setInt32("subtitleGeneration", mSubtitleGeneration); 1413 1414 packetSource->queueAccessUnit(buffer); 1415 return OK; 1416 } 1417 1418 if (mNextPTSTimeUs >= 0ll) { 1419 mFirstPTSValid = false; 1420 mAbsoluteTimeAnchorUs = mNextPTSTimeUs; 1421 mNextPTSTimeUs = -1ll; 1422 } 1423 1424 // This better be an ISO 13818-7 (AAC) or ISO 13818-1 (MPEG) audio 1425 // stream prefixed by an ID3 tag. 1426 1427 bool firstID3Tag = true; 1428 uint64_t PTS = 0; 1429 1430 for (;;) { 1431 // Make sure to skip all ID3 tags preceding the audio data. 1432 // At least one must be present to provide the PTS timestamp. 1433 1434 ID3 id3(buffer->data(), buffer->size(), true /* ignoreV1 */); 1435 if (!id3.isValid()) { 1436 if (firstID3Tag) { 1437 ALOGE("Unable to parse ID3 tag."); 1438 return ERROR_MALFORMED; 1439 } else { 1440 break; 1441 } 1442 } 1443 1444 if (firstID3Tag) { 1445 bool found = false; 1446 1447 ID3::Iterator it(id3, "PRIV"); 1448 while (!it.done()) { 1449 size_t length; 1450 const uint8_t *data = it.getData(&length); 1451 1452 static const char *kMatchName = 1453 "com.apple.streaming.transportStreamTimestamp"; 1454 static const size_t kMatchNameLen = strlen(kMatchName); 1455 1456 if (length == kMatchNameLen + 1 + 8 1457 && !strncmp((const char *)data, kMatchName, kMatchNameLen)) { 1458 found = true; 1459 PTS = U64_AT(&data[kMatchNameLen + 1]); 1460 } 1461 1462 it.next(); 1463 } 1464 1465 if (!found) { 1466 ALOGE("Unable to extract transportStreamTimestamp from ID3 tag."); 1467 return ERROR_MALFORMED; 1468 } 1469 } 1470 1471 // skip the ID3 tag 1472 buffer->setRange( 1473 buffer->offset() + id3.rawSize(), buffer->size() - id3.rawSize()); 1474 1475 firstID3Tag = false; 1476 } 1477 1478 if (mStreamTypeMask != LiveSession::STREAMTYPE_AUDIO) { 1479 ALOGW("This stream only contains audio data!"); 1480 1481 mStreamTypeMask &= LiveSession::STREAMTYPE_AUDIO; 1482 1483 if (mStreamTypeMask == 0) { 1484 return OK; 1485 } 1486 } 1487 1488 sp<AnotherPacketSource> packetSource = 1489 mPacketSources.valueFor(LiveSession::STREAMTYPE_AUDIO); 1490 1491 if (packetSource->getFormat() == NULL && buffer->size() >= 7) { 1492 ABitReader bits(buffer->data(), buffer->size()); 1493 1494 // adts_fixed_header 1495 1496 CHECK_EQ(bits.getBits(12), 0xfffu); 1497 bits.skipBits(3); // ID, layer 1498 bool protection_absent = bits.getBits(1) != 0; 1499 1500 unsigned profile = bits.getBits(2); 1501 CHECK_NE(profile, 3u); 1502 unsigned sampling_freq_index = bits.getBits(4); 1503 bits.getBits(1); // private_bit 1504 unsigned channel_configuration = bits.getBits(3); 1505 CHECK_NE(channel_configuration, 0u); 1506 bits.skipBits(2); // original_copy, home 1507 1508 sp<MetaData> meta = MakeAACCodecSpecificData( 1509 profile, sampling_freq_index, channel_configuration); 1510 1511 meta->setInt32(kKeyIsADTS, true); 1512 1513 packetSource->setFormat(meta); 1514 } 1515 1516 int64_t numSamples = 0ll; 1517 int32_t sampleRate; 1518 CHECK(packetSource->getFormat()->findInt32(kKeySampleRate, &sampleRate)); 1519 1520 int64_t timeUs = (PTS * 100ll) / 9ll; 1521 if (!mFirstPTSValid) { 1522 mFirstPTSValid = true; 1523 mFirstTimeUs = timeUs; 1524 } 1525 1526 size_t offset = 0; 1527 while (offset < buffer->size()) { 1528 const uint8_t *adtsHeader = buffer->data() + offset; 1529 CHECK_LT(offset + 5, buffer->size()); 1530 1531 unsigned aac_frame_length = 1532 ((adtsHeader[3] & 3) << 11) 1533 | (adtsHeader[4] << 3) 1534 | (adtsHeader[5] >> 5); 1535 1536 if (aac_frame_length == 0) { 1537 const uint8_t *id3Header = adtsHeader; 1538 if (!memcmp(id3Header, "ID3", 3)) { 1539 ID3 id3(id3Header, buffer->size() - offset, true); 1540 if (id3.isValid()) { 1541 offset += id3.rawSize(); 1542 continue; 1543 }; 1544 } 1545 return ERROR_MALFORMED; 1546 } 1547 1548 CHECK_LE(offset + aac_frame_length, buffer->size()); 1549 1550 int64_t unitTimeUs = timeUs + numSamples * 1000000ll / sampleRate; 1551 offset += aac_frame_length; 1552 1553 // Each AAC frame encodes 1024 samples. 1554 numSamples += 1024; 1555 1556 if (mStartup) { 1557 int64_t startTimeUs = unitTimeUs; 1558 if (mStartTimeUsRelative) { 1559 startTimeUs -= mFirstTimeUs; 1560 if (startTimeUs < 0) { 1561 startTimeUs = 0; 1562 } 1563 } 1564 if (startTimeUs < mStartTimeUs) { 1565 continue; 1566 } 1567 1568 if (mStartTimeUsNotify != NULL) { 1569 int32_t targetDurationSecs; 1570 CHECK(mPlaylist->meta()->findInt32("target-duration", &targetDurationSecs)); 1571 int64_t targetDurationUs = targetDurationSecs * 1000000ll; 1572 1573 // Duplicated logic from how we handle .ts playlists. 1574 if (mStartup && mSegmentStartTimeUs >= 0 1575 && timeUs - mStartTimeUs > targetDurationUs) { 1576 int32_t newSeqNumber = getSeqNumberWithAnchorTime(timeUs); 1577 if (newSeqNumber >= mSeqNumber) { 1578 --mSeqNumber; 1579 } else { 1580 mSeqNumber = newSeqNumber; 1581 } 1582 return -EAGAIN; 1583 } 1584 1585 mStartTimeUsNotify->setInt64("timeUsAudio", timeUs); 1586 mStartTimeUsNotify->setInt32("discontinuitySeq", mDiscontinuitySeq); 1587 mStartTimeUsNotify->setInt32("streamMask", LiveSession::STREAMTYPE_AUDIO); 1588 mStartTimeUsNotify->post(); 1589 mStartTimeUsNotify.clear(); 1590 } 1591 } 1592 1593 if (mStopParams != NULL) { 1594 // Queue discontinuity in original stream. 1595 int32_t discontinuitySeq; 1596 int64_t stopTimeUs; 1597 if (!mStopParams->findInt32("discontinuitySeq", &discontinuitySeq) 1598 || discontinuitySeq > mDiscontinuitySeq 1599 || !mStopParams->findInt64("timeUsAudio", &stopTimeUs) 1600 || (discontinuitySeq == mDiscontinuitySeq && unitTimeUs >= stopTimeUs)) { 1601 packetSource->queueAccessUnit(mSession->createFormatChangeBuffer()); 1602 mStreamTypeMask = 0; 1603 mPacketSources.clear(); 1604 return ERROR_OUT_OF_RANGE; 1605 } 1606 } 1607 1608 sp<ABuffer> unit = new ABuffer(aac_frame_length); 1609 memcpy(unit->data(), adtsHeader, aac_frame_length); 1610 1611 unit->meta()->setInt64("timeUs", unitTimeUs); 1612 setAccessUnitProperties(unit, packetSource); 1613 packetSource->queueAccessUnit(unit); 1614 } 1615 1616 return OK; 1617} 1618 1619void PlaylistFetcher::updateDuration() { 1620 int64_t durationUs = 0ll; 1621 for (size_t index = 0; index < mPlaylist->size(); ++index) { 1622 sp<AMessage> itemMeta; 1623 CHECK(mPlaylist->itemAt( 1624 index, NULL /* uri */, &itemMeta)); 1625 1626 int64_t itemDurationUs; 1627 CHECK(itemMeta->findInt64("durationUs", &itemDurationUs)); 1628 1629 durationUs += itemDurationUs; 1630 } 1631 1632 sp<AMessage> msg = mNotify->dup(); 1633 msg->setInt32("what", kWhatDurationUpdate); 1634 msg->setInt64("durationUs", durationUs); 1635 msg->post(); 1636} 1637 1638int64_t PlaylistFetcher::resumeThreshold(const sp<AMessage> &msg) { 1639 int64_t durationUs, threshold; 1640 if (msg->findInt64("durationUs", &durationUs)) { 1641 return kNumSkipFrames * durationUs; 1642 } 1643 1644 sp<RefBase> obj; 1645 msg->findObject("format", &obj); 1646 MetaData *format = static_cast<MetaData *>(obj.get()); 1647 1648 const char *mime; 1649 CHECK(format->findCString(kKeyMIMEType, &mime)); 1650 bool audio = !strncasecmp(mime, "audio/", 6); 1651 if (audio) { 1652 // Assumes 1000 samples per frame. 1653 int32_t sampleRate; 1654 CHECK(format->findInt32(kKeySampleRate, &sampleRate)); 1655 return kNumSkipFrames /* frames */ * 1000 /* samples */ 1656 * (1000000 / sampleRate) /* sample duration (us) */; 1657 } else { 1658 int32_t frameRate; 1659 if (format->findInt32(kKeyFrameRate, &frameRate) && frameRate > 0) { 1660 return kNumSkipFrames * (1000000 / frameRate); 1661 } 1662 } 1663 1664 return 500000ll; 1665} 1666 1667} // namespace android 1668