src/media/base/android/media_source_player.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/base/android/media_source_player.h"
   6
   7 #include <limits>
   8
   9 #include "base/android/jni_android.h"
  10 #include "base/android/jni_string.h"
  11 #include "base/barrier_closure.h"
  12 #include "base/basictypes.h"
  13 #include "base/bind.h"
  14 #include "base/callback_helpers.h"
  15 #include "base/debug/trace_event.h"
  16 #include "base/logging.h"
  17 #include "base/strings/string_number_conversions.h"
  18 #include "media/base/android/audio_decoder_job.h"
  19 #include "media/base/android/media_drm_bridge.h"
  20 #include "media/base/android/media_player_manager.h"
  21 #include "media/base/android/video_decoder_job.h"
  22
  23
  24 namespace media {
  25
  26 MediaSourcePlayer::MediaSourcePlayer(
  27     int player_id,
  28     MediaPlayerManager* manager,
  29     const RequestMediaResourcesCB& request_media_resources_cb,
  30     const ReleaseMediaResourcesCB& release_media_resources_cb,
  31     scoped_ptr<DemuxerAndroid> demuxer,
  32     const GURL& frame_url)
  33     : MediaPlayerAndroid(player_id,
  34                          manager,
  35                          request_media_resources_cb,
  36                          release_media_resources_cb,
  37                          frame_url),
  38       demuxer_(demuxer.Pass()),
  39       pending_event_(NO_EVENT_PENDING),
  40       playing_(false),
  41       clock_(&default_tick_clock_),
  42       doing_browser_seek_(false),
  43       pending_seek_(false),
  44       drm_bridge_(NULL),
  45       cdm_registration_id_(0),
  46       is_waiting_for_key_(false),
  47       is_waiting_for_audio_decoder_(false),
  48       is_waiting_for_video_decoder_(false),
  49       weak_factory_(this) {
  50   audio_decoder_job_.reset(new AudioDecoderJob(
  51       base::Bind(&DemuxerAndroid::RequestDemuxerData,
  52                  base::Unretained(demuxer_.get()),
  53                  DemuxerStream::AUDIO),
  54       base::Bind(&MediaSourcePlayer::OnDemuxerConfigsChanged,
  55                  weak_factory_.GetWeakPtr())));
  56   video_decoder_job_.reset(new VideoDecoderJob(
  57       base::Bind(&DemuxerAndroid::RequestDemuxerData,
  58                  base::Unretained(demuxer_.get()),
  59                  DemuxerStream::VIDEO),
  60       base::Bind(request_media_resources_cb_, player_id),
  61       base::Bind(release_media_resources_cb_, player_id),
  62       base::Bind(&MediaSourcePlayer::OnDemuxerConfigsChanged,
  63                  weak_factory_.GetWeakPtr())));
  64   demuxer_->Initialize(this);
  65   clock_.SetMaxTime(base::TimeDelta());
  66   weak_this_ = weak_factory_.GetWeakPtr();
  67 }
  68
  69 MediaSourcePlayer::~MediaSourcePlayer() {
  70   Release();
  71   DCHECK_EQ(!drm_bridge_, !cdm_registration_id_);
  72   if (drm_bridge_) {
  73     drm_bridge_->UnregisterPlayer(cdm_registration_id_);
  74     cdm_registration_id_ = 0;
  75   }
  76 }
  77
  78 void MediaSourcePlayer::SetVideoSurface(gfx::ScopedJavaSurface surface) {
  79   DVLOG(1) << __FUNCTION__;
  80   if (!video_decoder_job_->SetVideoSurface(surface.Pass()))
  81     return;
  82   // Retry video decoder creation.
  83   RetryDecoderCreation(false, true);
  84 }
  85
  86 void MediaSourcePlayer::ScheduleSeekEventAndStopDecoding(
  87     base::TimeDelta seek_time) {
  88   DVLOG(1) << __FUNCTION__ << "(" << seek_time.InSecondsF() << ")";
  89   DCHECK(!IsEventPending(SEEK_EVENT_PENDING));
  90
  91   pending_seek_ = false;
  92
  93   clock_.SetTime(seek_time, seek_time);
  94
  95   if (audio_decoder_job_->is_decoding())
  96     audio_decoder_job_->StopDecode();
  97   if (video_decoder_job_->is_decoding())
  98     video_decoder_job_->StopDecode();
  99
 100   SetPendingEvent(SEEK_EVENT_PENDING);
 101   ProcessPendingEvents();
 102 }
 103
 104 void MediaSourcePlayer::BrowserSeekToCurrentTime() {
 105   DVLOG(1) << __FUNCTION__;
 106
 107   DCHECK(!IsEventPending(SEEK_EVENT_PENDING));
 108   doing_browser_seek_ = true;
 109   ScheduleSeekEventAndStopDecoding(GetCurrentTime());
 110 }
 111
 112 bool MediaSourcePlayer::Seekable() {
 113   // If the duration TimeDelta, converted to milliseconds from microseconds,
 114   // is >= 2^31, then the media is assumed to be unbounded and unseekable.
 115   // 2^31 is the bound due to java player using 32-bit integer for time
 116   // values at millisecond resolution.
 117   return duration_ <
 118          base::TimeDelta::FromMilliseconds(std::numeric_limits<int32>::max());
 119 }
 120
 121 void MediaSourcePlayer::Start() {
 122   DVLOG(1) << __FUNCTION__;
 123
 124   playing_ = true;
 125
 126   bool request_fullscreen = IsProtectedSurfaceRequired();
 127 #if defined(VIDEO_HOLE)
 128   // Skip to request fullscreen when hole-punching is used.
 129   request_fullscreen = request_fullscreen &&
 130       !manager()->ShouldUseVideoOverlayForEmbeddedEncryptedVideo();
 131 #endif  // defined(VIDEO_HOLE)
 132   if (request_fullscreen)
 133     manager()->RequestFullScreen(player_id());
 134
 135   StartInternal();
 136 }
 137
 138 void MediaSourcePlayer::Pause(bool is_media_related_action) {
 139   DVLOG(1) << __FUNCTION__;
 140
 141   // Since decoder jobs have their own thread, decoding is not fully paused
 142   // until all the decoder jobs call MediaDecoderCallback(). It is possible
 143   // that Start() is called while the player is waiting for
 144   // MediaDecoderCallback(). In that case, decoding will continue when
 145   // MediaDecoderCallback() is called.
 146   playing_ = false;
 147   start_time_ticks_ = base::TimeTicks();
 148 }
 149
 150 bool MediaSourcePlayer::IsPlaying() {
 151   return playing_;
 152 }
 153
 154 int MediaSourcePlayer::GetVideoWidth() {
 155   return video_decoder_job_->width();
 156 }
 157
 158 int MediaSourcePlayer::GetVideoHeight() {
 159   return video_decoder_job_->height();
 160 }
 161
 162 void MediaSourcePlayer::SeekTo(base::TimeDelta timestamp) {
 163   DVLOG(1) << __FUNCTION__ << "(" << timestamp.InSecondsF() << ")";
 164
 165   if (IsEventPending(SEEK_EVENT_PENDING)) {
 166     DCHECK(doing_browser_seek_) << "SeekTo while SeekTo in progress";
 167     DCHECK(!pending_seek_) << "SeekTo while SeekTo pending browser seek";
 168
 169     // There is a browser seek currently in progress to obtain I-frame to feed
 170     // a newly constructed video decoder. Remember this real seek request so
 171     // it can be initiated once OnDemuxerSeekDone() occurs for the browser seek.
 172     pending_seek_ = true;
 173     pending_seek_time_ = timestamp;
 174     return;
 175   }
 176
 177   doing_browser_seek_ = false;
 178   ScheduleSeekEventAndStopDecoding(timestamp);
 179 }
 180
 181 base::TimeDelta MediaSourcePlayer::GetCurrentTime() {
 182   return clock_.Elapsed();
 183 }
 184
 185 base::TimeDelta MediaSourcePlayer::GetDuration() {
 186   return duration_;
 187 }
 188
 189 void MediaSourcePlayer::Release() {
 190   DVLOG(1) << __FUNCTION__;
 191
 192   is_surface_in_use_ = false;
 193   audio_decoder_job_->ReleaseDecoderResources();
 194   video_decoder_job_->ReleaseDecoderResources();
 195
 196   // Prevent player restart, including job re-creation attempts.
 197   playing_ = false;
 198
 199   decoder_starvation_callback_.Cancel();
 200 }
 201
 202 void MediaSourcePlayer::SetVolume(double volume) {
 203   audio_decoder_job_->SetVolume(volume);
 204 }
 205
 206 bool MediaSourcePlayer::IsSurfaceInUse() const {
 207   return is_surface_in_use_;
 208 }
 209
 210 bool MediaSourcePlayer::CanPause() {
 211   return Seekable();
 212 }
 213
 214 bool MediaSourcePlayer::CanSeekForward() {
 215   return Seekable();
 216 }
 217
 218 bool MediaSourcePlayer::CanSeekBackward() {
 219   return Seekable();
 220 }
 221
 222 bool MediaSourcePlayer::IsPlayerReady() {
 223   return audio_decoder_job_ || video_decoder_job_;
 224 }
 225
 226 void MediaSourcePlayer::StartInternal() {
 227   DVLOG(1) << __FUNCTION__;
 228   // If there are pending events, wait for them finish.
 229   if (pending_event_ != NO_EVENT_PENDING)
 230     return;
 231
 232   // When we start, we'll have new demuxed data coming in. This new data could
 233   // be clear (not encrypted) or encrypted with different keys. So
 234   // |is_waiting_for_key_| condition may not be true anymore.
 235   is_waiting_for_key_ = false;
 236
 237   SetPendingEvent(PREFETCH_REQUEST_EVENT_PENDING);
 238   ProcessPendingEvents();
 239 }
 240
 241 void MediaSourcePlayer::OnDemuxerConfigsAvailable(
 242     const DemuxerConfigs& configs) {
 243   DVLOG(1) << __FUNCTION__;
 244   DCHECK(!HasAudio() && !HasVideo());
 245   duration_ = configs.duration;
 246   clock_.SetDuration(duration_);
 247
 248   audio_decoder_job_->SetDemuxerConfigs(configs);
 249   video_decoder_job_->SetDemuxerConfigs(configs);
 250   OnDemuxerConfigsChanged();
 251 }
 252
 253 void MediaSourcePlayer::OnDemuxerDataAvailable(const DemuxerData& data) {
 254   DVLOG(1) << __FUNCTION__ << "(" << data.type << ")";
 255   DCHECK_LT(0u, data.access_units.size());
 256   CHECK_GE(1u, data.demuxer_configs.size());
 257
 258   if (data.type == DemuxerStream::AUDIO)
 259     audio_decoder_job_->OnDataReceived(data);
 260   else if (data.type == DemuxerStream::VIDEO)
 261     video_decoder_job_->OnDataReceived(data);
 262 }
 263
 264 void MediaSourcePlayer::OnDemuxerDurationChanged(base::TimeDelta duration) {
 265   duration_ = duration;
 266   clock_.SetDuration(duration_);
 267 }
 268
 269 void MediaSourcePlayer::OnMediaCryptoReady() {
 270   DCHECK(!drm_bridge_->GetMediaCrypto().is_null());
 271   drm_bridge_->SetMediaCryptoReadyCB(base::Closure());
 272
 273   // Retry decoder creation if the decoders are waiting for MediaCrypto.
 274   RetryDecoderCreation(true, true);
 275 }
 276
 277 void MediaSourcePlayer::SetCdm(BrowserCdm* cdm) {
 278   // Currently we don't support DRM change during the middle of playback, even
 279   // if the player is paused.
 280   // TODO(qinmin): support DRM change after playback has started.
 281   // http://crbug.com/253792.
 282   if (GetCurrentTime() > base::TimeDelta()) {
 283     VLOG(0) << "Setting DRM bridge after playback has started. "
 284             << "This is not well supported!";
 285   }
 286
 287   if (drm_bridge_) {
 288     NOTREACHED() << "Currently we do not support resetting CDM.";
 289     return;
 290   }
 291
 292   // Only MediaDrmBridge will be set on MediaSourcePlayer.
 293   drm_bridge_ = static_cast<MediaDrmBridge*>(cdm);
 294
 295   cdm_registration_id_ = drm_bridge_->RegisterPlayer(
 296       base::Bind(&MediaSourcePlayer::OnKeyAdded, weak_this_),
 297       base::Bind(&MediaSourcePlayer::OnCdmUnset, weak_this_));
 298
 299   audio_decoder_job_->SetDrmBridge(drm_bridge_);
 300   video_decoder_job_->SetDrmBridge(drm_bridge_);
 301
 302   if (drm_bridge_->GetMediaCrypto().is_null()) {
 303     drm_bridge_->SetMediaCryptoReadyCB(
 304         base::Bind(&MediaSourcePlayer::OnMediaCryptoReady, weak_this_));
 305     return;
 306   }
 307
 308   // If the player is previously waiting for CDM, retry decoder creation.
 309   RetryDecoderCreation(true, true);
 310 }
 311
 312 void MediaSourcePlayer::OnDemuxerSeekDone(
 313     base::TimeDelta actual_browser_seek_time) {
 314   DVLOG(1) << __FUNCTION__;
 315
 316   ClearPendingEvent(SEEK_EVENT_PENDING);
 317   if (IsEventPending(PREFETCH_REQUEST_EVENT_PENDING))
 318     ClearPendingEvent(PREFETCH_REQUEST_EVENT_PENDING);
 319
 320   if (pending_seek_) {
 321     DVLOG(1) << __FUNCTION__ << "processing pending seek";
 322     DCHECK(doing_browser_seek_);
 323     pending_seek_ = false;
 324     SeekTo(pending_seek_time_);
 325     return;
 326   }
 327
 328   // It is possible that a browser seek to I-frame had to seek to a buffered
 329   // I-frame later than the requested one due to data removal or GC. Update
 330   // player clock to the actual seek target.
 331   if (doing_browser_seek_) {
 332     DCHECK(actual_browser_seek_time != kNoTimestamp());
 333     base::TimeDelta seek_time = actual_browser_seek_time;
 334     // A browser seek must not jump into the past. Ideally, it seeks to the
 335     // requested time, but it might jump into the future.
 336     DCHECK(seek_time >= GetCurrentTime());
 337     DVLOG(1) << __FUNCTION__ << " : setting clock to actual browser seek time: "
 338              << seek_time.InSecondsF();
 339     clock_.SetTime(seek_time, seek_time);
 340     audio_decoder_job_->SetBaseTimestamp(seek_time);
 341   } else {
 342     DCHECK(actual_browser_seek_time == kNoTimestamp());
 343   }
 344
 345   base::TimeDelta current_time = GetCurrentTime();
 346   // TODO(qinmin): Simplify the logic by using |start_presentation_timestamp_|
 347   // to preroll media decoder jobs. Currently |start_presentation_timestamp_|
 348   // is calculated from decoder output, while preroll relies on the access
 349   // unit's timestamp. There are some differences between the two.
 350   preroll_timestamp_ = current_time;
 351   if (HasAudio())
 352     audio_decoder_job_->BeginPrerolling(preroll_timestamp_);
 353   if (HasVideo())
 354     video_decoder_job_->BeginPrerolling(preroll_timestamp_);
 355
 356   if (!doing_browser_seek_)
 357     manager()->OnSeekComplete(player_id(), current_time);
 358
 359   ProcessPendingEvents();
 360 }
 361
 362 void MediaSourcePlayer::UpdateTimestamps(
 363     base::TimeDelta current_presentation_timestamp,
 364     base::TimeDelta max_presentation_timestamp) {
 365   clock_.SetTime(current_presentation_timestamp, max_presentation_timestamp);
 366   manager()->OnTimeUpdate(player_id(), GetCurrentTime());
 367 }
 368
 369 void MediaSourcePlayer::ProcessPendingEvents() {
 370   DVLOG(1) << __FUNCTION__ << " : 0x" << std::hex << pending_event_;
 371   // Wait for all the decoding jobs to finish before processing pending tasks.
 372   if (video_decoder_job_->is_decoding()) {
 373     DVLOG(1) << __FUNCTION__ << " : A video job is still decoding.";
 374     return;
 375   }
 376
 377   if (audio_decoder_job_->is_decoding()) {
 378     DVLOG(1) << __FUNCTION__ << " : An audio job is still decoding.";
 379     return;
 380   }
 381
 382   if (IsEventPending(PREFETCH_DONE_EVENT_PENDING)) {
 383     DVLOG(1) << __FUNCTION__ << " : PREFETCH_DONE still pending.";
 384     return;
 385   }
 386
 387   if (IsEventPending(SEEK_EVENT_PENDING)) {
 388     DVLOG(1) << __FUNCTION__ << " : Handling SEEK_EVENT";
 389     ClearDecodingData();
 390     audio_decoder_job_->SetBaseTimestamp(GetCurrentTime());
 391     demuxer_->RequestDemuxerSeek(GetCurrentTime(), doing_browser_seek_);
 392     return;
 393   }
 394
 395   if (IsEventPending(DECODER_CREATION_EVENT_PENDING)) {
 396     // Don't continue if one of the decoder is not created.
 397     if (is_waiting_for_audio_decoder_ || is_waiting_for_video_decoder_)
 398       return;
 399     ClearPendingEvent(DECODER_CREATION_EVENT_PENDING);
 400   }
 401
 402   if (IsEventPending(PREFETCH_REQUEST_EVENT_PENDING)) {
 403     DVLOG(1) << __FUNCTION__ << " : Handling PREFETCH_REQUEST_EVENT.";
 404     int count = (AudioFinished() ? 0 : 1) + (VideoFinished() ? 0 : 1);
 405
 406     // It is possible that all streams have finished decode, yet starvation
 407     // occurred during the last stream's EOS decode. In this case, prefetch is a
 408     // no-op.
 409     ClearPendingEvent(PREFETCH_REQUEST_EVENT_PENDING);
 410     if (count == 0)
 411       return;
 412
 413     SetPendingEvent(PREFETCH_DONE_EVENT_PENDING);
 414     base::Closure barrier = BarrierClosure(
 415         count, base::Bind(&MediaSourcePlayer::OnPrefetchDone, weak_this_));
 416
 417     if (!AudioFinished())
 418       audio_decoder_job_->Prefetch(barrier);
 419
 420     if (!VideoFinished())
 421       video_decoder_job_->Prefetch(barrier);
 422
 423     return;
 424   }
 425
 426   DCHECK_EQ(pending_event_, NO_EVENT_PENDING);
 427
 428   // Now that all pending events have been handled, resume decoding if we are
 429   // still playing.
 430   if (playing_)
 431     StartInternal();
 432 }
 433
 434 void MediaSourcePlayer::MediaDecoderCallback(
 435     bool is_audio, MediaCodecStatus status,
 436     base::TimeDelta current_presentation_timestamp,
 437     base::TimeDelta max_presentation_timestamp) {
 438   DVLOG(1) << __FUNCTION__ << ": " << is_audio << ", " << status;
 439
 440   // TODO(xhwang): Drop IntToString() when http://crbug.com/303899 is fixed.
 441   if (is_audio) {
 442     TRACE_EVENT_ASYNC_END1("media",
 443                            "MediaSourcePlayer::DecodeMoreAudio",
 444                            audio_decoder_job_.get(),
 445                            "MediaCodecStatus",
 446                            base::IntToString(status));
 447   } else {
 448     TRACE_EVENT_ASYNC_END1("media",
 449                            "MediaSourcePlayer::DecodeMoreVideo",
 450                            video_decoder_job_.get(),
 451                            "MediaCodecStatus",
 452                            base::IntToString(status));
 453   }
 454
 455   // Let tests hook the completion of this decode cycle.
 456   if (!decode_callback_for_testing_.is_null())
 457     base::ResetAndReturn(&decode_callback_for_testing_).Run();
 458
 459   bool is_clock_manager = is_audio || !HasAudio();
 460
 461   if (is_clock_manager)
 462     decoder_starvation_callback_.Cancel();
 463
 464   if (status == MEDIA_CODEC_ERROR) {
 465     DVLOG(1) << __FUNCTION__ << " : decode error";
 466     Release();
 467     manager()->OnError(player_id(), MEDIA_ERROR_DECODE);
 468     return;
 469   }
 470
 471   DCHECK(!IsEventPending(PREFETCH_DONE_EVENT_PENDING));
 472
 473   // Let |SEEK_EVENT_PENDING| (the highest priority event outside of
 474   // |PREFETCH_DONE_EVENT_PENDING|) preempt output EOS detection here. Process
 475   // any other pending events only after handling EOS detection.
 476   if (IsEventPending(SEEK_EVENT_PENDING)) {
 477     ProcessPendingEvents();
 478     return;
 479   }
 480
 481   if ((status == MEDIA_CODEC_OK || status == MEDIA_CODEC_INPUT_END_OF_STREAM) &&
 482       is_clock_manager && current_presentation_timestamp != kNoTimestamp()) {
 483     UpdateTimestamps(current_presentation_timestamp,
 484                      max_presentation_timestamp);
 485   }
 486
 487   if (status == MEDIA_CODEC_OUTPUT_END_OF_STREAM)
 488     PlaybackCompleted(is_audio);
 489
 490   if (pending_event_ != NO_EVENT_PENDING) {
 491     ProcessPendingEvents();
 492     return;
 493   }
 494
 495   if (status == MEDIA_CODEC_OUTPUT_END_OF_STREAM)
 496     return;
 497
 498   if (!playing_) {
 499     if (is_clock_manager)
 500       clock_.Pause();
 501     return;
 502   }
 503
 504   if (status == MEDIA_CODEC_NO_KEY) {
 505     is_waiting_for_key_ = true;
 506     return;
 507   }
 508
 509   // If the status is MEDIA_CODEC_STOPPED, stop decoding new data. The player is
 510   // in the middle of a seek or stop event and needs to wait for the IPCs to
 511   // come.
 512   if (status == MEDIA_CODEC_STOPPED)
 513     return;
 514
 515   if (is_clock_manager) {
 516     // If we have a valid timestamp, start the starvation callback. Otherwise,
 517     // reset the |start_time_ticks_| so that the next frame will not suffer
 518     // from the decoding delay caused by the current frame.
 519     if (current_presentation_timestamp != kNoTimestamp())
 520       StartStarvationCallback(current_presentation_timestamp,
 521                               max_presentation_timestamp);
 522     else
 523       start_time_ticks_ = base::TimeTicks::Now();
 524   }
 525
 526   if (is_audio)
 527     DecodeMoreAudio();
 528   else
 529     DecodeMoreVideo();
 530 }
 531
 532 void MediaSourcePlayer::DecodeMoreAudio() {
 533   DVLOG(1) << __FUNCTION__;
 534   DCHECK(!audio_decoder_job_->is_decoding());
 535   DCHECK(!AudioFinished());
 536
 537   if (audio_decoder_job_->Decode(
 538       start_time_ticks_,
 539       start_presentation_timestamp_,
 540       base::Bind(&MediaSourcePlayer::MediaDecoderCallback, weak_this_, true))) {
 541     TRACE_EVENT_ASYNC_BEGIN0("media", "MediaSourcePlayer::DecodeMoreAudio",
 542                              audio_decoder_job_.get());
 543     return;
 544   }
 545
 546   is_waiting_for_audio_decoder_ = true;
 547   if (!IsEventPending(DECODER_CREATION_EVENT_PENDING))
 548     SetPendingEvent(DECODER_CREATION_EVENT_PENDING);
 549 }
 550
 551 void MediaSourcePlayer::DecodeMoreVideo() {
 552   DVLOG(1) << __FUNCTION__;
 553   DCHECK(!video_decoder_job_->is_decoding());
 554   DCHECK(!VideoFinished());
 555
 556   if (video_decoder_job_->Decode(
 557       start_time_ticks_,
 558       start_presentation_timestamp_,
 559       base::Bind(&MediaSourcePlayer::MediaDecoderCallback, weak_this_,
 560                  false))) {
 561     TRACE_EVENT_ASYNC_BEGIN0("media", "MediaSourcePlayer::DecodeMoreVideo",
 562                              video_decoder_job_.get());
 563     return;
 564   }
 565
 566   // If the decoder is waiting for iframe, trigger a browser seek.
 567   if (!video_decoder_job_->next_video_data_is_iframe()) {
 568     BrowserSeekToCurrentTime();
 569     return;
 570   }
 571
 572   is_waiting_for_video_decoder_ = true;
 573   if (!IsEventPending(DECODER_CREATION_EVENT_PENDING))
 574     SetPendingEvent(DECODER_CREATION_EVENT_PENDING);
 575 }
 576
 577 void MediaSourcePlayer::PlaybackCompleted(bool is_audio) {
 578   DVLOG(1) << __FUNCTION__ << "(" << is_audio << ")";
 579
 580   if (AudioFinished() && VideoFinished()) {
 581     playing_ = false;
 582     clock_.Pause();
 583     start_time_ticks_ = base::TimeTicks();
 584     manager()->OnPlaybackComplete(player_id());
 585   }
 586 }
 587
 588 void MediaSourcePlayer::ClearDecodingData() {
 589   DVLOG(1) << __FUNCTION__;
 590   audio_decoder_job_->Flush();
 591   video_decoder_job_->Flush();
 592   start_time_ticks_ = base::TimeTicks();
 593 }
 594
 595 bool MediaSourcePlayer::HasVideo() {
 596   return video_decoder_job_->HasStream();
 597 }
 598
 599 bool MediaSourcePlayer::HasAudio() {
 600   return audio_decoder_job_->HasStream();
 601 }
 602
 603 bool MediaSourcePlayer::AudioFinished() {
 604   return audio_decoder_job_->OutputEOSReached() || !HasAudio();
 605 }
 606
 607 bool MediaSourcePlayer::VideoFinished() {
 608   return video_decoder_job_->OutputEOSReached() || !HasVideo();
 609 }
 610
 611 void MediaSourcePlayer::OnDecoderStarved() {
 612   DVLOG(1) << __FUNCTION__;
 613   SetPendingEvent(PREFETCH_REQUEST_EVENT_PENDING);
 614   ProcessPendingEvents();
 615 }
 616
 617 void MediaSourcePlayer::StartStarvationCallback(
 618     base::TimeDelta current_presentation_timestamp,
 619     base::TimeDelta max_presentation_timestamp) {
 620   // 20ms was chosen because it is the typical size of a compressed audio frame.
 621   // Anything smaller than this would likely cause unnecessary cycling in and
 622   // out of the prefetch state.
 623   const base::TimeDelta kMinStarvationTimeout =
 624       base::TimeDelta::FromMilliseconds(20);
 625
 626   base::TimeDelta current_timestamp = GetCurrentTime();
 627   base::TimeDelta timeout;
 628   if (HasAudio()) {
 629     timeout = max_presentation_timestamp - current_timestamp;
 630   } else {
 631     DCHECK(current_timestamp <= current_presentation_timestamp);
 632
 633     // For video only streams, fps can be estimated from the difference
 634     // between the previous and current presentation timestamps. The
 635     // previous presentation timestamp is equal to current_timestamp.
 636     // TODO(qinmin): determine whether 2 is a good coefficient for estimating
 637     // video frame timeout.
 638     timeout = 2 * (current_presentation_timestamp - current_timestamp);
 639   }
 640
 641   timeout = std::max(timeout, kMinStarvationTimeout);
 642
 643   decoder_starvation_callback_.Reset(
 644       base::Bind(&MediaSourcePlayer::OnDecoderStarved, weak_this_));
 645   base::MessageLoop::current()->PostDelayedTask(
 646       FROM_HERE, decoder_starvation_callback_.callback(), timeout);
 647 }
 648
 649 bool MediaSourcePlayer::IsProtectedSurfaceRequired() {
 650   return video_decoder_job_->is_content_encrypted() &&
 651       drm_bridge_ && drm_bridge_->IsProtectedSurfaceRequired();
 652 }
 653
 654 void MediaSourcePlayer::OnPrefetchDone() {
 655   DVLOG(1) << __FUNCTION__;
 656   DCHECK(!audio_decoder_job_->is_decoding());
 657   DCHECK(!video_decoder_job_->is_decoding());
 658
 659   // A previously posted OnPrefetchDone() could race against a Release(). If
 660   // Release() won the race, we should no longer have decoder jobs.
 661   // TODO(qinmin/wolenetz): Maintain channel state to not double-request data
 662   // or drop data received across Release()+Start(). See http://crbug.com/306314
 663   // and http://crbug.com/304234.
 664   if (!IsEventPending(PREFETCH_DONE_EVENT_PENDING)) {
 665     DVLOG(1) << __FUNCTION__ << " : aborting";
 666     return;
 667   }
 668
 669   ClearPendingEvent(PREFETCH_DONE_EVENT_PENDING);
 670
 671   if (pending_event_ != NO_EVENT_PENDING) {
 672     ProcessPendingEvents();
 673     return;
 674   }
 675
 676   if (!playing_)
 677     return;
 678
 679   start_time_ticks_ = base::TimeTicks::Now();
 680   start_presentation_timestamp_ = GetCurrentTime();
 681   if (!clock_.IsPlaying())
 682     clock_.Play();
 683
 684   if (!AudioFinished())
 685     DecodeMoreAudio();
 686
 687   if (!VideoFinished())
 688     DecodeMoreVideo();
 689 }
 690
 691 void MediaSourcePlayer::OnDemuxerConfigsChanged() {
 692   manager()->OnMediaMetadataChanged(
 693       player_id(), duration_, GetVideoWidth(), GetVideoHeight(), true);
 694 }
 695
 696 const char* MediaSourcePlayer::GetEventName(PendingEventFlags event) {
 697   // Please keep this in sync with PendingEventFlags.
 698   static const char* kPendingEventNames[] = {
 699     "PREFETCH_DONE",
 700     "SEEK",
 701     "DECODER_CREATION",
 702     "PREFETCH_REQUEST",
 703   };
 704
 705   int mask = 1;
 706   for (size_t i = 0; i < arraysize(kPendingEventNames); ++i, mask <<= 1) {
 707     if (event & mask)
 708       return kPendingEventNames[i];
 709   }
 710
 711   return "UNKNOWN";
 712 }
 713
 714 bool MediaSourcePlayer::IsEventPending(PendingEventFlags event) const {
 715   return pending_event_ & event;
 716 }
 717
 718 void MediaSourcePlayer::SetPendingEvent(PendingEventFlags event) {
 719   DVLOG(1) << __FUNCTION__ << "(" << GetEventName(event) << ")";
 720   DCHECK_NE(event, NO_EVENT_PENDING);
 721   DCHECK(!IsEventPending(event));
 722
 723   pending_event_ |= event;
 724 }
 725
 726 void MediaSourcePlayer::ClearPendingEvent(PendingEventFlags event) {
 727   DVLOG(1) << __FUNCTION__ << "(" << GetEventName(event) << ")";
 728   DCHECK_NE(event, NO_EVENT_PENDING);
 729   DCHECK(IsEventPending(event)) << GetEventName(event);
 730
 731   pending_event_ &= ~event;
 732 }
 733
 734 void MediaSourcePlayer::RetryDecoderCreation(bool audio, bool video) {
 735   if (audio)
 736     is_waiting_for_audio_decoder_ = false;
 737   if (video)
 738     is_waiting_for_video_decoder_ = false;
 739   if (IsEventPending(DECODER_CREATION_EVENT_PENDING))
 740     ProcessPendingEvents();
 741 }
 742
 743 void MediaSourcePlayer::OnKeyAdded() {
 744   DVLOG(1) << __FUNCTION__;
 745   if (!is_waiting_for_key_)
 746     return;
 747
 748   is_waiting_for_key_ = false;
 749   if (playing_)
 750     StartInternal();
 751 }
 752
 753 void MediaSourcePlayer::OnCdmUnset() {
 754   DVLOG(1) << __FUNCTION__;
 755   // TODO(xhwang): Support detachment of CDM. This will be needed when we start
 756   // to support setMediaKeys(0) (see http://crbug.com/330324), or when we
 757   // release MediaDrm when the video is paused, or when the device goes to
 758   // sleep (see http://crbug.com/272421).
 759   NOTREACHED() << "CDM detachment not supported.";
 760   DCHECK(drm_bridge_);
 761   audio_decoder_job_->SetDrmBridge(NULL);
 762   video_decoder_job_->SetDrmBridge(NULL);
 763   drm_bridge_ = NULL;
 764 }
 765
 766 }  // namespace media