media/blink/webmediaplayer_impl.cc

   1 // Copyright 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/blink/webmediaplayer_impl.h"
   6
   7 #include <algorithm>
   8 #include <cmath>
   9 #include <limits>
  10
  11 #include "base/bind.h"
  12 #include "base/callback.h"
  13 #include "base/callback_helpers.h"
  14 #include "base/debug/alias.h"
  15 #include "base/debug/crash_logging.h"
  16 #include "base/metrics/histogram.h"
  17 #include "base/single_thread_task_runner.h"
  18 #include "base/synchronization/waitable_event.h"
  19 #include "base/thread_task_runner_handle.h"
  20 #include "base/trace_event/trace_event.h"
  21 #include "cc/blink/web_layer_impl.h"
  22 #include "cc/layers/video_layer.h"
  23 #include "gpu/blink/webgraphicscontext3d_impl.h"
  24 #include "media/audio/null_audio_sink.h"
  25 #include "media/base/bind_to_current_loop.h"
  26 #include "media/base/cdm_context.h"
  27 #include "media/base/limits.h"
  28 #include "media/base/media_log.h"
  29 #include "media/base/text_renderer.h"
  30 #include "media/base/video_frame.h"
  31 #include "media/blink/texttrack_impl.h"
  32 #include "media/blink/webaudiosourceprovider_impl.h"
  33 #include "media/blink/webcontentdecryptionmodule_impl.h"
  34 #include "media/blink/webinbandtexttrack_impl.h"
  35 #include "media/blink/webmediaplayer_delegate.h"
  36 #include "media/blink/webmediaplayer_util.h"
  37 #include "media/blink/webmediasource_impl.h"
  38 #include "media/filters/chunk_demuxer.h"
  39 #include "media/filters/ffmpeg_demuxer.h"
  40 #include "third_party/WebKit/public/platform/WebEncryptedMediaTypes.h"
  41 #include "third_party/WebKit/public/platform/WebMediaPlayerClient.h"
  42 #include "third_party/WebKit/public/platform/WebMediaPlayerEncryptedMediaClient.h"
  43 #include "third_party/WebKit/public/platform/WebMediaSource.h"
  44 #include "third_party/WebKit/public/platform/WebRect.h"
  45 #include "third_party/WebKit/public/platform/WebSize.h"
  46 #include "third_party/WebKit/public/platform/WebString.h"
  47 #include "third_party/WebKit/public/platform/WebURL.h"
  48 #include "third_party/WebKit/public/web/WebDocument.h"
  49 #include "third_party/WebKit/public/web/WebFrame.h"
  50 #include "third_party/WebKit/public/web/WebLocalFrame.h"
  51 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
  52 #include "third_party/WebKit/public/web/WebSecurityOrigin.h"
  53 #include "third_party/WebKit/public/web/WebView.h"
  54
  55 using blink::WebCanvas;
  56 using blink::WebMediaPlayer;
  57 using blink::WebRect;
  58 using blink::WebSize;
  59 using blink::WebString;
  60
  61 namespace {
  62
  63 // Limits the range of playback rate.
  64 //
  65 // TODO(kylep): Revisit these.
  66 //
  67 // Vista has substantially lower performance than XP or Windows7.  If you speed
  68 // up a video too much, it can't keep up, and rendering stops updating except on
  69 // the time bar. For really high speeds, audio becomes a bottleneck and we just
  70 // use up the data we have, which may not achieve the speed requested, but will
  71 // not crash the tab.
  72 //
  73 // A very slow speed, ie 0.00000001x, causes the machine to lock up. (It seems
  74 // like a busy loop). It gets unresponsive, although its not completely dead.
  75 //
  76 // Also our timers are not very accurate (especially for ogg), which becomes
  77 // evident at low speeds and on Vista. Since other speeds are risky and outside
  78 // the norms, we think 1/16x to 16x is a safe and useful range for now.
  79 const double kMinRate = 0.0625;
  80 const double kMaxRate = 16.0;
  81
  82 }  // namespace
  83
  84 namespace media {
  85
  86 class BufferedDataSourceHostImpl;
  87
  88 #define STATIC_ASSERT_MATCHING_ENUM(name) \
  89   static_assert(static_cast<int>(WebMediaPlayer::CORSMode ## name) == \
  90                 static_cast<int>(BufferedResourceLoader::k ## name), \
  91                 "mismatching enum values: " #name)
  92 STATIC_ASSERT_MATCHING_ENUM(Unspecified);
  93 STATIC_ASSERT_MATCHING_ENUM(Anonymous);
  94 STATIC_ASSERT_MATCHING_ENUM(UseCredentials);
  95 #undef STATIC_ASSERT_MATCHING_ENUM
  96
  97 #define BIND_TO_RENDER_LOOP(function) \
  98   (DCHECK(main_task_runner_->BelongsToCurrentThread()), \
  99   BindToCurrentLoop(base::Bind(function, AsWeakPtr())))
 100
 101 #define BIND_TO_RENDER_LOOP1(function, arg1) \
 102   (DCHECK(main_task_runner_->BelongsToCurrentThread()), \
 103   BindToCurrentLoop(base::Bind(function, AsWeakPtr(), arg1)))
 104
 105 WebMediaPlayerImpl::WebMediaPlayerImpl(
 106     blink::WebLocalFrame* frame,
 107     blink::WebMediaPlayerClient* client,
 108     blink::WebMediaPlayerEncryptedMediaClient* encrypted_client,
 109     base::WeakPtr<WebMediaPlayerDelegate> delegate,
 110     scoped_ptr<RendererFactory> renderer_factory,
 111     CdmFactory* cdm_factory,
 112     const WebMediaPlayerParams& params)
 113     : frame_(frame),
 114       network_state_(WebMediaPlayer::NetworkStateEmpty),
 115       ready_state_(WebMediaPlayer::ReadyStateHaveNothing),
 116       preload_(BufferedDataSource::AUTO),
 117       main_task_runner_(base::ThreadTaskRunnerHandle::Get()),
 118       media_task_runner_(params.media_task_runner()),
 119       media_log_(params.media_log()),
 120       pipeline_(media_task_runner_, media_log_.get()),
 121       load_type_(LoadTypeURL),
 122       opaque_(false),
 123       playback_rate_(0.0),
 124       paused_(true),
 125       seeking_(false),
 126       ended_(false),
 127       pending_seek_(false),
 128       should_notify_time_changed_(false),
 129       client_(client),
 130       encrypted_client_(encrypted_client),
 131       delegate_(delegate),
 132       defer_load_cb_(params.defer_load_cb()),
 133       context_3d_cb_(params.context_3d_cb()),
 134       supports_save_(true),
 135       chunk_demuxer_(NULL),
 136       // Threaded compositing isn't enabled universally yet.
 137       compositor_task_runner_(
 138           params.compositor_task_runner()
 139               ? params.compositor_task_runner()
 140               : base::MessageLoop::current()->task_runner()),
 141       compositor_(new VideoFrameCompositor(
 142           compositor_task_runner_,
 143           BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnNaturalSizeChanged),
 144           BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnOpacityChanged))),
 145       encrypted_media_support_(cdm_factory,
 146                                encrypted_client,
 147                                params.media_permission(),
 148                                base::Bind(&WebMediaPlayerImpl::SetCdm,
 149                                           AsWeakPtr(),
 150                                           base::Bind(&IgnoreCdmAttached))),
 151       renderer_factory_(renderer_factory.Pass()) {
 152   media_log_->AddEvent(
 153       media_log_->CreateEvent(MediaLogEvent::WEBMEDIAPLAYER_CREATED));
 154
 155   if (params.initial_cdm()) {
 156     SetCdm(base::Bind(&IgnoreCdmAttached),
 157            ToWebContentDecryptionModuleImpl(params.initial_cdm())
 158                ->GetCdmContext());
 159   }
 160
 161   // TODO(xhwang): When we use an external Renderer, many methods won't work,
 162   // e.g. GetCurrentFrameFromCompositor(). See http://crbug.com/434861
 163
 164   // Use the null sink if no sink was provided.
 165   audio_source_provider_ = new WebAudioSourceProviderImpl(
 166       params.audio_renderer_sink().get()
 167           ? params.audio_renderer_sink()
 168           : new NullAudioSink(media_task_runner_));
 169 }
 170
 171 WebMediaPlayerImpl::~WebMediaPlayerImpl() {
 172   client_->setWebLayer(NULL);
 173
 174   DCHECK(main_task_runner_->BelongsToCurrentThread());
 175
 176   if (delegate_)
 177     delegate_->PlayerGone(this);
 178
 179   // Abort any pending IO so stopping the pipeline doesn't get blocked.
 180   if (data_source_)
 181     data_source_->Abort();
 182   if (chunk_demuxer_) {
 183     chunk_demuxer_->Shutdown();
 184     chunk_demuxer_ = NULL;
 185   }
 186
 187   renderer_factory_.reset();
 188
 189   // Make sure to kill the pipeline so there's no more media threads running.
 190   // Note: stopping the pipeline might block for a long time.
 191   base::WaitableEvent waiter(false, false);
 192   pipeline_.Stop(
 193       base::Bind(&base::WaitableEvent::Signal, base::Unretained(&waiter)));
 194   waiter.Wait();
 195
 196   compositor_task_runner_->DeleteSoon(FROM_HERE, compositor_);
 197
 198   media_log_->AddEvent(
 199       media_log_->CreateEvent(MediaLogEvent::WEBMEDIAPLAYER_DESTROYED));
 200 }
 201
 202 void WebMediaPlayerImpl::load(LoadType load_type, const blink::WebURL& url,
 203                               CORSMode cors_mode) {
 204   DVLOG(1) << __FUNCTION__ << "(" << load_type << ", " << url << ", "
 205            << cors_mode << ")";
 206   if (!defer_load_cb_.is_null()) {
 207     defer_load_cb_.Run(base::Bind(
 208         &WebMediaPlayerImpl::DoLoad, AsWeakPtr(), load_type, url, cors_mode));
 209     return;
 210   }
 211   DoLoad(load_type, url, cors_mode);
 212 }
 213
 214 void WebMediaPlayerImpl::DoLoad(LoadType load_type,
 215                                 const blink::WebURL& url,
 216                                 CORSMode cors_mode) {
 217   DCHECK(main_task_runner_->BelongsToCurrentThread());
 218
 219   GURL gurl(url);
 220   ReportMetrics(load_type, gurl,
 221                 GURL(frame_->document().securityOrigin().toString()));
 222
 223   // Set subresource URL for crash reporting.
 224   base::debug::SetCrashKeyValue("subresource_url", gurl.spec());
 225
 226   load_type_ = load_type;
 227
 228   SetNetworkState(WebMediaPlayer::NetworkStateLoading);
 229   SetReadyState(WebMediaPlayer::ReadyStateHaveNothing);
 230   media_log_->AddEvent(media_log_->CreateLoadEvent(url.spec()));
 231
 232   // Media source pipelines can start immediately.
 233   if (load_type == LoadTypeMediaSource) {
 234     supports_save_ = false;
 235     StartPipeline();
 236     return;
 237   }
 238
 239   // Otherwise it's a regular request which requires resolving the URL first.
 240   data_source_.reset(new BufferedDataSource(
 241       url,
 242       static_cast<BufferedResourceLoader::CORSMode>(cors_mode),
 243       main_task_runner_,
 244       frame_,
 245       media_log_.get(),
 246       &buffered_data_source_host_,
 247       base::Bind(&WebMediaPlayerImpl::NotifyDownloading, AsWeakPtr())));
 248   data_source_->SetPreload(preload_);
 249   data_source_->Initialize(
 250       base::Bind(&WebMediaPlayerImpl::DataSourceInitialized, AsWeakPtr()));
 251 }
 252
 253 void WebMediaPlayerImpl::play() {
 254   DVLOG(1) << __FUNCTION__;
 255   DCHECK(main_task_runner_->BelongsToCurrentThread());
 256
 257   paused_ = false;
 258   pipeline_.SetPlaybackRate(playback_rate_);
 259   if (data_source_)
 260     data_source_->MediaIsPlaying();
 261
 262   media_log_->AddEvent(media_log_->CreateEvent(MediaLogEvent::PLAY));
 263
 264   if (delegate_ && playback_rate_ > 0)
 265     delegate_->DidPlay(this);
 266 }
 267
 268 void WebMediaPlayerImpl::pause() {
 269   DVLOG(1) << __FUNCTION__;
 270   DCHECK(main_task_runner_->BelongsToCurrentThread());
 271
 272   const bool was_already_paused = paused_ || playback_rate_ == 0;
 273   paused_ = true;
 274   pipeline_.SetPlaybackRate(0.0);
 275   if (data_source_)
 276     data_source_->MediaIsPaused();
 277   UpdatePausedTime();
 278
 279   media_log_->AddEvent(media_log_->CreateEvent(MediaLogEvent::PAUSE));
 280
 281   if (!was_already_paused && delegate_)
 282     delegate_->DidPause(this);
 283 }
 284
 285 bool WebMediaPlayerImpl::supportsSave() const {
 286   DCHECK(main_task_runner_->BelongsToCurrentThread());
 287   return supports_save_;
 288 }
 289
 290 void WebMediaPlayerImpl::seek(double seconds) {
 291   DVLOG(1) << __FUNCTION__ << "(" << seconds << "s)";
 292   DCHECK(main_task_runner_->BelongsToCurrentThread());
 293
 294   ended_ = false;
 295
 296   ReadyState old_state = ready_state_;
 297   if (ready_state_ > WebMediaPlayer::ReadyStateHaveMetadata)
 298     SetReadyState(WebMediaPlayer::ReadyStateHaveMetadata);
 299
 300   base::TimeDelta new_seek_time = ConvertSecondsToTimestamp(seconds);
 301
 302   if (seeking_) {
 303     if (new_seek_time == seek_time_) {
 304       if (chunk_demuxer_) {
 305         if (!pending_seek_) {
 306           // If using media source demuxer, only suppress redundant seeks if
 307           // there is no pending seek. This enforces that any pending seek that
 308           // results in a demuxer seek is preceded by matching
 309           // CancelPendingSeek() and StartWaitingForSeek() calls.
 310           return;
 311         }
 312       } else {
 313         // Suppress all redundant seeks if unrestricted by media source demuxer
 314         // API.
 315         pending_seek_ = false;
 316         pending_seek_time_ = base::TimeDelta();
 317         return;
 318       }
 319     }
 320
 321     pending_seek_ = true;
 322     pending_seek_time_ = new_seek_time;
 323     if (chunk_demuxer_)
 324       chunk_demuxer_->CancelPendingSeek(pending_seek_time_);
 325     return;
 326   }
 327
 328   media_log_->AddEvent(media_log_->CreateSeekEvent(seconds));
 329
 330   // Update our paused time.
 331   // In paused state ignore the seek operations to current time if the loading
 332   // is completed and generate OnPipelineBufferingStateChanged event to
 333   // eventually fire seeking and seeked events
 334   if (paused_) {
 335     if (paused_time_ != new_seek_time) {
 336       paused_time_ = new_seek_time;
 337     } else if (old_state == ReadyStateHaveEnoughData) {
 338       main_task_runner_->PostTask(
 339           FROM_HERE,
 340           base::Bind(&WebMediaPlayerImpl::OnPipelineBufferingStateChanged,
 341                      AsWeakPtr(), BUFFERING_HAVE_ENOUGH));
 342       return;
 343     }
 344   }
 345
 346   seeking_ = true;
 347   seek_time_ = new_seek_time;
 348
 349   if (chunk_demuxer_)
 350     chunk_demuxer_->StartWaitingForSeek(seek_time_);
 351
 352   // Kick off the asynchronous seek!
 353   pipeline_.Seek(seek_time_, BIND_TO_RENDER_LOOP1(
 354                                  &WebMediaPlayerImpl::OnPipelineSeeked, true));
 355 }
 356
 357 void WebMediaPlayerImpl::setRate(double rate) {
 358   DVLOG(1) << __FUNCTION__ << "(" << rate << ")";
 359   DCHECK(main_task_runner_->BelongsToCurrentThread());
 360
 361   // TODO(kylep): Remove when support for negatives is added. Also, modify the
 362   // following checks so rewind uses reasonable values also.
 363   if (rate < 0.0)
 364     return;
 365
 366   // Limit rates to reasonable values by clamping.
 367   if (rate != 0.0) {
 368     if (rate < kMinRate)
 369       rate = kMinRate;
 370     else if (rate > kMaxRate)
 371       rate = kMaxRate;
 372     if (playback_rate_ == 0 && !paused_ && delegate_)
 373       delegate_->DidPlay(this);
 374   } else if (playback_rate_ != 0 && !paused_ && delegate_) {
 375     delegate_->DidPause(this);
 376   }
 377
 378   playback_rate_ = rate;
 379   if (!paused_) {
 380     pipeline_.SetPlaybackRate(rate);
 381     if (data_source_)
 382       data_source_->MediaPlaybackRateChanged(rate);
 383   }
 384 }
 385
 386 void WebMediaPlayerImpl::setVolume(double volume) {
 387   DVLOG(1) << __FUNCTION__ << "(" << volume << ")";
 388   DCHECK(main_task_runner_->BelongsToCurrentThread());
 389
 390   pipeline_.SetVolume(volume);
 391 }
 392
 393 void WebMediaPlayerImpl::setSinkId(const blink::WebString& device_id,
 394                                    WebSetSinkIdCB* web_callbacks) {
 395   DCHECK(main_task_runner_->BelongsToCurrentThread());
 396   std::string device_id_str(device_id.utf8());
 397   GURL security_origin(frame_->securityOrigin().toString().utf8());
 398   DVLOG(1) << __FUNCTION__
 399            << "(" << device_id_str << ", " << security_origin << ")";
 400   audio_source_provider_->SwitchOutputDevice(
 401       device_id_str, security_origin,
 402       ConvertToSwitchOutputDeviceCB(web_callbacks));
 403 }
 404
 405 #define STATIC_ASSERT_MATCHING_ENUM(webkit_name, chromium_name) \
 406     static_assert(static_cast<int>(WebMediaPlayer::webkit_name) == \
 407                   static_cast<int>(BufferedDataSource::chromium_name), \
 408                   "mismatching enum values: " #webkit_name)
 409 STATIC_ASSERT_MATCHING_ENUM(PreloadNone, NONE);
 410 STATIC_ASSERT_MATCHING_ENUM(PreloadMetaData, METADATA);
 411 STATIC_ASSERT_MATCHING_ENUM(PreloadAuto, AUTO);
 412 #undef STATIC_ASSERT_MATCHING_ENUM
 413
 414 void WebMediaPlayerImpl::setPreload(WebMediaPlayer::Preload preload) {
 415   DVLOG(1) << __FUNCTION__ << "(" << preload << ")";
 416   DCHECK(main_task_runner_->BelongsToCurrentThread());
 417
 418   preload_ = static_cast<BufferedDataSource::Preload>(preload);
 419   if (data_source_)
 420     data_source_->SetPreload(preload_);
 421 }
 422
 423 bool WebMediaPlayerImpl::hasVideo() const {
 424   DCHECK(main_task_runner_->BelongsToCurrentThread());
 425
 426   return pipeline_metadata_.has_video;
 427 }
 428
 429 bool WebMediaPlayerImpl::hasAudio() const {
 430   DCHECK(main_task_runner_->BelongsToCurrentThread());
 431
 432   return pipeline_metadata_.has_audio;
 433 }
 434
 435 blink::WebSize WebMediaPlayerImpl::naturalSize() const {
 436   DCHECK(main_task_runner_->BelongsToCurrentThread());
 437
 438   return blink::WebSize(pipeline_metadata_.natural_size);
 439 }
 440
 441 bool WebMediaPlayerImpl::paused() const {
 442   DCHECK(main_task_runner_->BelongsToCurrentThread());
 443
 444   return pipeline_.GetPlaybackRate() == 0.0f;
 445 }
 446
 447 bool WebMediaPlayerImpl::seeking() const {
 448   DCHECK(main_task_runner_->BelongsToCurrentThread());
 449
 450   if (ready_state_ == WebMediaPlayer::ReadyStateHaveNothing)
 451     return false;
 452
 453   return seeking_;
 454 }
 455
 456 double WebMediaPlayerImpl::duration() const {
 457   DCHECK(main_task_runner_->BelongsToCurrentThread());
 458
 459   if (ready_state_ == WebMediaPlayer::ReadyStateHaveNothing)
 460     return std::numeric_limits<double>::quiet_NaN();
 461
 462   return GetPipelineDuration();
 463 }
 464
 465 double WebMediaPlayerImpl::timelineOffset() const {
 466   DCHECK(main_task_runner_->BelongsToCurrentThread());
 467
 468   if (pipeline_metadata_.timeline_offset.is_null())
 469     return std::numeric_limits<double>::quiet_NaN();
 470
 471   return pipeline_metadata_.timeline_offset.ToJsTime();
 472 }
 473
 474 double WebMediaPlayerImpl::currentTime() const {
 475   DCHECK(main_task_runner_->BelongsToCurrentThread());
 476   DCHECK_NE(ready_state_, WebMediaPlayer::ReadyStateHaveNothing);
 477
 478   // TODO(scherkus): Replace with an explicit ended signal to HTMLMediaElement,
 479   // see http://crbug.com/409280
 480   if (ended_)
 481     return duration();
 482
 483   // We know the current seek time better than pipeline: pipeline may processing
 484   // an earlier seek before a pending seek has been started, or it might not yet
 485   // have the current seek time returnable via GetMediaTime().
 486   if (seeking()) {
 487     return pending_seek_ ? pending_seek_time_.InSecondsF()
 488                          : seek_time_.InSecondsF();
 489   }
 490
 491   return (paused_ ? paused_time_ : pipeline_.GetMediaTime()).InSecondsF();
 492 }
 493
 494 WebMediaPlayer::NetworkState WebMediaPlayerImpl::networkState() const {
 495   DCHECK(main_task_runner_->BelongsToCurrentThread());
 496   return network_state_;
 497 }
 498
 499 WebMediaPlayer::ReadyState WebMediaPlayerImpl::readyState() const {
 500   DCHECK(main_task_runner_->BelongsToCurrentThread());
 501   return ready_state_;
 502 }
 503
 504 blink::WebTimeRanges WebMediaPlayerImpl::buffered() const {
 505   DCHECK(main_task_runner_->BelongsToCurrentThread());
 506
 507   Ranges<base::TimeDelta> buffered_time_ranges =
 508       pipeline_.GetBufferedTimeRanges();
 509
 510   const base::TimeDelta duration = pipeline_.GetMediaDuration();
 511   if (duration != kInfiniteDuration()) {
 512     buffered_data_source_host_.AddBufferedTimeRanges(
 513         &buffered_time_ranges, duration);
 514   }
 515   return ConvertToWebTimeRanges(buffered_time_ranges);
 516 }
 517
 518 blink::WebTimeRanges WebMediaPlayerImpl::seekable() const {
 519   DCHECK(main_task_runner_->BelongsToCurrentThread());
 520
 521   if (ready_state_ < WebMediaPlayer::ReadyStateHaveMetadata)
 522     return blink::WebTimeRanges();
 523
 524   const double seekable_end = duration();
 525
 526   // Allow a special exception for seeks to zero for streaming sources with a
 527   // finite duration; this allows looping to work.
 528   const bool allow_seek_to_zero = data_source_ && data_source_->IsStreaming() &&
 529                                   std::isfinite(seekable_end);
 530
 531   // TODO(dalecurtis): Technically this allows seeking on media which return an
 532   // infinite duration so long as DataSource::IsStreaming() is false.  While not
 533   // expected, disabling this breaks semi-live players, http://crbug.com/427412.
 534   const blink::WebTimeRange seekable_range(
 535       0.0, allow_seek_to_zero ? 0.0 : seekable_end);
 536   return blink::WebTimeRanges(&seekable_range, 1);
 537 }
 538
 539 bool WebMediaPlayerImpl::didLoadingProgress() {
 540   DCHECK(main_task_runner_->BelongsToCurrentThread());
 541   bool pipeline_progress = pipeline_.DidLoadingProgress();
 542   bool data_progress = buffered_data_source_host_.DidLoadingProgress();
 543   return pipeline_progress || data_progress;
 544 }
 545
 546 void WebMediaPlayerImpl::paint(blink::WebCanvas* canvas,
 547                                const blink::WebRect& rect,
 548                                unsigned char alpha,
 549                                SkXfermode::Mode mode) {
 550   DCHECK(main_task_runner_->BelongsToCurrentThread());
 551   TRACE_EVENT0("media", "WebMediaPlayerImpl:paint");
 552
 553   // TODO(scherkus): Clarify paint() API contract to better understand when and
 554   // why it's being called. For example, today paint() is called when:
 555   //   - We haven't reached HAVE_CURRENT_DATA and need to paint black
 556   //   - We're painting to a canvas
 557   // See http://crbug.com/341225 http://crbug.com/342621 for details.
 558   scoped_refptr<VideoFrame> video_frame = GetCurrentFrameFromCompositor();
 559
 560   gfx::Rect gfx_rect(rect);
 561   Context3D context_3d;
 562   if (video_frame.get() && video_frame->HasTextures()) {
 563     if (!context_3d_cb_.is_null())
 564       context_3d = context_3d_cb_.Run();
 565     // GPU Process crashed.
 566     if (!context_3d.gl)
 567       return;
 568   }
 569   skcanvas_video_renderer_.Paint(video_frame, canvas, gfx_rect, alpha, mode,
 570                                  pipeline_metadata_.video_rotation, context_3d);
 571 }
 572
 573 bool WebMediaPlayerImpl::hasSingleSecurityOrigin() const {
 574   if (data_source_)
 575     return data_source_->HasSingleOrigin();
 576   return true;
 577 }
 578
 579 bool WebMediaPlayerImpl::didPassCORSAccessCheck() const {
 580   if (data_source_)
 581     return data_source_->DidPassCORSAccessCheck();
 582   return false;
 583 }
 584
 585 double WebMediaPlayerImpl::mediaTimeForTimeValue(double timeValue) const {
 586   return ConvertSecondsToTimestamp(timeValue).InSecondsF();
 587 }
 588
 589 unsigned WebMediaPlayerImpl::decodedFrameCount() const {
 590   DCHECK(main_task_runner_->BelongsToCurrentThread());
 591
 592   PipelineStatistics stats = pipeline_.GetStatistics();
 593   return stats.video_frames_decoded;
 594 }
 595
 596 unsigned WebMediaPlayerImpl::droppedFrameCount() const {
 597   DCHECK(main_task_runner_->BelongsToCurrentThread());
 598
 599   PipelineStatistics stats = pipeline_.GetStatistics();
 600   return stats.video_frames_dropped;
 601 }
 602
 603 unsigned WebMediaPlayerImpl::audioDecodedByteCount() const {
 604   DCHECK(main_task_runner_->BelongsToCurrentThread());
 605
 606   PipelineStatistics stats = pipeline_.GetStatistics();
 607   return stats.audio_bytes_decoded;
 608 }
 609
 610 unsigned WebMediaPlayerImpl::videoDecodedByteCount() const {
 611   DCHECK(main_task_runner_->BelongsToCurrentThread());
 612
 613   PipelineStatistics stats = pipeline_.GetStatistics();
 614   return stats.video_bytes_decoded;
 615 }
 616
 617 bool WebMediaPlayerImpl::copyVideoTextureToPlatformTexture(
 618     blink::WebGraphicsContext3D* web_graphics_context,
 619     unsigned int texture,
 620     unsigned int internal_format,
 621     unsigned int type,
 622     bool premultiply_alpha,
 623     bool flip_y) {
 624   TRACE_EVENT0("media", "WebMediaPlayerImpl:copyVideoTextureToPlatformTexture");
 625
 626   scoped_refptr<VideoFrame> video_frame = GetCurrentFrameFromCompositor();
 627
 628   if (!video_frame.get() || !video_frame->HasTextures() ||
 629       media::VideoFrame::NumPlanes(video_frame->format()) != 1) {
 630     return false;
 631   }
 632
 633   // TODO(dshwang): need more elegant way to convert WebGraphicsContext3D to
 634   // GLES2Interface.
 635   gpu::gles2::GLES2Interface* gl =
 636       static_cast<gpu_blink::WebGraphicsContext3DImpl*>(web_graphics_context)
 637           ->GetGLInterface();
 638   SkCanvasVideoRenderer::CopyVideoFrameSingleTextureToGLTexture(
 639       gl, video_frame.get(), texture, internal_format, type, premultiply_alpha,
 640       flip_y);
 641   return true;
 642 }
 643
 644 WebMediaPlayer::MediaKeyException
 645 WebMediaPlayerImpl::generateKeyRequest(const WebString& key_system,
 646                                        const unsigned char* init_data,
 647                                        unsigned init_data_length) {
 648   DCHECK(main_task_runner_->BelongsToCurrentThread());
 649
 650   return encrypted_media_support_.GenerateKeyRequest(
 651       frame_, key_system, init_data, init_data_length);
 652 }
 653
 654 WebMediaPlayer::MediaKeyException WebMediaPlayerImpl::addKey(
 655     const WebString& key_system,
 656     const unsigned char* key,
 657     unsigned key_length,
 658     const unsigned char* init_data,
 659     unsigned init_data_length,
 660     const WebString& session_id) {
 661   DCHECK(main_task_runner_->BelongsToCurrentThread());
 662
 663   return encrypted_media_support_.AddKey(
 664       key_system, key, key_length, init_data, init_data_length, session_id);
 665 }
 666
 667 WebMediaPlayer::MediaKeyException WebMediaPlayerImpl::cancelKeyRequest(
 668     const WebString& key_system,
 669     const WebString& session_id) {
 670   DCHECK(main_task_runner_->BelongsToCurrentThread());
 671
 672   return encrypted_media_support_.CancelKeyRequest(key_system, session_id);
 673 }
 674
 675 void WebMediaPlayerImpl::setContentDecryptionModule(
 676     blink::WebContentDecryptionModule* cdm,
 677     blink::WebContentDecryptionModuleResult result) {
 678   DCHECK(main_task_runner_->BelongsToCurrentThread());
 679
 680   // Once the CDM is set it can't be cleared as there may be frames being
 681   // decrypted on other threads. So fail this request.
 682   // http://crbug.com/462365#c7.
 683   if (!cdm) {
 684     result.completeWithError(
 685         blink::WebContentDecryptionModuleExceptionInvalidStateError, 0,
 686         "The existing MediaKeys object cannot be removed at this time.");
 687     return;
 688   }
 689
 690   SetCdm(BIND_TO_RENDER_LOOP1(&WebMediaPlayerImpl::OnCdmAttached, result),
 691          ToWebContentDecryptionModuleImpl(cdm)->GetCdmContext());
 692 }
 693
 694 void WebMediaPlayerImpl::OnEncryptedMediaInitData(
 695     EmeInitDataType init_data_type,
 696     const std::vector<uint8>& init_data) {
 697   DCHECK(init_data_type != EmeInitDataType::UNKNOWN);
 698
 699   // Do not fire "encrypted" event if encrypted media is not enabled.
 700   // TODO(xhwang): Handle this in |client_|.
 701   if (!blink::WebRuntimeFeatures::isPrefixedEncryptedMediaEnabled() &&
 702       !blink::WebRuntimeFeatures::isEncryptedMediaEnabled()) {
 703     return;
 704   }
 705
 706   // TODO(xhwang): Update this UMA name.
 707   UMA_HISTOGRAM_COUNTS("Media.EME.NeedKey", 1);
 708
 709   encrypted_media_support_.SetInitDataType(init_data_type);
 710
 711   encrypted_client_->encrypted(
 712       ConvertToWebInitDataType(init_data_type), vector_as_array(&init_data),
 713       base::saturated_cast<unsigned int>(init_data.size()));
 714 }
 715
 716 void WebMediaPlayerImpl::OnWaitingForDecryptionKey() {
 717   encrypted_client_->didBlockPlaybackWaitingForKey();
 718
 719   // TODO(jrummell): didResumePlaybackBlockedForKey() should only be called
 720   // when a key has been successfully added (e.g. OnSessionKeysChange() with
 721   // |has_additional_usable_key| = true). http://crbug.com/461903
 722   encrypted_client_->didResumePlaybackBlockedForKey();
 723 }
 724
 725 void WebMediaPlayerImpl::SetCdm(const CdmAttachedCB& cdm_attached_cb,
 726                                 CdmContext* cdm_context) {
 727   // If CDM initialization succeeded, tell the pipeline about it.
 728   if (cdm_context)
 729     pipeline_.SetCdm(cdm_context, cdm_attached_cb);
 730 }
 731
 732 void WebMediaPlayerImpl::OnCdmAttached(
 733     blink::WebContentDecryptionModuleResult result,
 734     bool success) {
 735   if (success) {
 736     result.complete();
 737     return;
 738   }
 739
 740   result.completeWithError(
 741       blink::WebContentDecryptionModuleExceptionNotSupportedError, 0,
 742       "Unable to set MediaKeys object");
 743 }
 744
 745 void WebMediaPlayerImpl::OnPipelineSeeked(bool time_changed,
 746                                           PipelineStatus status) {
 747   DVLOG(1) << __FUNCTION__ << "(" << time_changed << ", " << status << ")";
 748   DCHECK(main_task_runner_->BelongsToCurrentThread());
 749   seeking_ = false;
 750   seek_time_ = base::TimeDelta();
 751   if (pending_seek_) {
 752     double pending_seek_seconds = pending_seek_time_.InSecondsF();
 753     pending_seek_ = false;
 754     pending_seek_time_ = base::TimeDelta();
 755     seek(pending_seek_seconds);
 756     return;
 757   }
 758
 759   if (status != PIPELINE_OK) {
 760     OnPipelineError(status);
 761     return;
 762   }
 763
 764   // Update our paused time.
 765   if (paused_)
 766     UpdatePausedTime();
 767
 768   should_notify_time_changed_ = time_changed;
 769 }
 770
 771 void WebMediaPlayerImpl::OnPipelineEnded() {
 772   DVLOG(1) << __FUNCTION__;
 773   DCHECK(main_task_runner_->BelongsToCurrentThread());
 774
 775   // Ignore state changes until we've completed all outstanding seeks.
 776   if (seeking_ || pending_seek_)
 777     return;
 778
 779   ended_ = true;
 780   client_->timeChanged();
 781 }
 782
 783 void WebMediaPlayerImpl::OnPipelineError(PipelineStatus error) {
 784   DCHECK(main_task_runner_->BelongsToCurrentThread());
 785   DCHECK_NE(error, PIPELINE_OK);
 786
 787   if (ready_state_ == WebMediaPlayer::ReadyStateHaveNothing) {
 788     // Any error that occurs before reaching ReadyStateHaveMetadata should
 789     // be considered a format error.
 790     SetNetworkState(WebMediaPlayer::NetworkStateFormatError);
 791     return;
 792   }
 793
 794   SetNetworkState(PipelineErrorToNetworkState(error));
 795 }
 796
 797 void WebMediaPlayerImpl::OnPipelineMetadata(
 798     PipelineMetadata metadata) {
 799   DVLOG(1) << __FUNCTION__;
 800
 801   pipeline_metadata_ = metadata;
 802
 803   UMA_HISTOGRAM_ENUMERATION("Media.VideoRotation", metadata.video_rotation,
 804                             VIDEO_ROTATION_MAX + 1);
 805   SetReadyState(WebMediaPlayer::ReadyStateHaveMetadata);
 806
 807   if (hasVideo()) {
 808     DCHECK(!video_weblayer_);
 809     scoped_refptr<cc::VideoLayer> layer =
 810         cc::VideoLayer::Create(cc_blink::WebLayerImpl::LayerSettings(),
 811                                compositor_, pipeline_metadata_.video_rotation);
 812
 813     if (pipeline_metadata_.video_rotation == VIDEO_ROTATION_90 ||
 814         pipeline_metadata_.video_rotation == VIDEO_ROTATION_270) {
 815       gfx::Size size = pipeline_metadata_.natural_size;
 816       pipeline_metadata_.natural_size = gfx::Size(size.height(), size.width());
 817     }
 818
 819     video_weblayer_.reset(new cc_blink::WebLayerImpl(layer));
 820     video_weblayer_->setOpaque(opaque_);
 821     client_->setWebLayer(video_weblayer_.get());
 822   }
 823 }
 824
 825 void WebMediaPlayerImpl::OnPipelineBufferingStateChanged(
 826     BufferingState buffering_state) {
 827   DVLOG(1) << __FUNCTION__ << "(" << buffering_state << ")";
 828
 829   // Ignore buffering state changes until we've completed all outstanding seeks.
 830   if (seeking_ || pending_seek_)
 831     return;
 832
 833   // TODO(scherkus): Handle other buffering states when Pipeline starts using
 834   // them and translate them ready state changes http://crbug.com/144683
 835   DCHECK_EQ(buffering_state, BUFFERING_HAVE_ENOUGH);
 836   SetReadyState(WebMediaPlayer::ReadyStateHaveEnoughData);
 837
 838   // Let the DataSource know we have enough data. It may use this information to
 839   // release unused network connections.
 840   if (data_source_)
 841     data_source_->OnBufferingHaveEnough();
 842
 843   // Blink expects a timeChanged() in response to a seek().
 844   if (should_notify_time_changed_)
 845     client_->timeChanged();
 846 }
 847
 848 void WebMediaPlayerImpl::OnDemuxerOpened() {
 849   DCHECK(main_task_runner_->BelongsToCurrentThread());
 850   client_->mediaSourceOpened(
 851       new WebMediaSourceImpl(chunk_demuxer_, media_log_));
 852 }
 853
 854 void WebMediaPlayerImpl::OnAddTextTrack(
 855     const TextTrackConfig& config,
 856     const AddTextTrackDoneCB& done_cb) {
 857   DCHECK(main_task_runner_->BelongsToCurrentThread());
 858
 859   const WebInbandTextTrackImpl::Kind web_kind =
 860       static_cast<WebInbandTextTrackImpl::Kind>(config.kind());
 861   const blink::WebString web_label =
 862       blink::WebString::fromUTF8(config.label());
 863   const blink::WebString web_language =
 864       blink::WebString::fromUTF8(config.language());
 865   const blink::WebString web_id =
 866       blink::WebString::fromUTF8(config.id());
 867
 868   scoped_ptr<WebInbandTextTrackImpl> web_inband_text_track(
 869       new WebInbandTextTrackImpl(web_kind, web_label, web_language, web_id));
 870
 871   scoped_ptr<TextTrack> text_track(new TextTrackImpl(
 872       main_task_runner_, client_, web_inband_text_track.Pass()));
 873
 874   done_cb.Run(text_track.Pass());
 875 }
 876
 877 void WebMediaPlayerImpl::DataSourceInitialized(bool success) {
 878   DCHECK(main_task_runner_->BelongsToCurrentThread());
 879
 880   if (!success) {
 881     SetNetworkState(WebMediaPlayer::NetworkStateFormatError);
 882     return;
 883   }
 884
 885   StartPipeline();
 886 }
 887
 888 void WebMediaPlayerImpl::NotifyDownloading(bool is_downloading) {
 889   if (!is_downloading && network_state_ == WebMediaPlayer::NetworkStateLoading)
 890     SetNetworkState(WebMediaPlayer::NetworkStateIdle);
 891   else if (is_downloading && network_state_ == WebMediaPlayer::NetworkStateIdle)
 892     SetNetworkState(WebMediaPlayer::NetworkStateLoading);
 893   media_log_->AddEvent(
 894       media_log_->CreateBooleanEvent(
 895           MediaLogEvent::NETWORK_ACTIVITY_SET,
 896           "is_downloading_data", is_downloading));
 897 }
 898
 899 void WebMediaPlayerImpl::StartPipeline() {
 900   DCHECK(main_task_runner_->BelongsToCurrentThread());
 901
 902   Demuxer::EncryptedMediaInitDataCB encrypted_media_init_data_cb =
 903       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnEncryptedMediaInitData);
 904
 905   // Figure out which demuxer to use.
 906   if (load_type_ != LoadTypeMediaSource) {
 907     DCHECK(!chunk_demuxer_);
 908     DCHECK(data_source_);
 909
 910     demuxer_.reset(new FFmpegDemuxer(media_task_runner_, data_source_.get(),
 911                                      encrypted_media_init_data_cb, media_log_));
 912   } else {
 913     DCHECK(!chunk_demuxer_);
 914     DCHECK(!data_source_);
 915
 916     chunk_demuxer_ = new ChunkDemuxer(
 917         BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnDemuxerOpened),
 918         encrypted_media_init_data_cb, media_log_, true);
 919     demuxer_.reset(chunk_demuxer_);
 920   }
 921
 922   // ... and we're ready to go!
 923   seeking_ = true;
 924
 925   pipeline_.Start(
 926       demuxer_.get(),
 927       renderer_factory_->CreateRenderer(
 928           media_task_runner_, audio_source_provider_.get(), compositor_),
 929       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineEnded),
 930       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineError),
 931       BIND_TO_RENDER_LOOP1(&WebMediaPlayerImpl::OnPipelineSeeked, false),
 932       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineMetadata),
 933       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineBufferingStateChanged),
 934       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnDurationChanged),
 935       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnAddTextTrack),
 936       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnWaitingForDecryptionKey));
 937 }
 938
 939 void WebMediaPlayerImpl::SetNetworkState(WebMediaPlayer::NetworkState state) {
 940   DVLOG(1) << __FUNCTION__ << "(" << state << ")";
 941   DCHECK(main_task_runner_->BelongsToCurrentThread());
 942   network_state_ = state;
 943   // Always notify to ensure client has the latest value.
 944   client_->networkStateChanged();
 945 }
 946
 947 void WebMediaPlayerImpl::SetReadyState(WebMediaPlayer::ReadyState state) {
 948   DVLOG(1) << __FUNCTION__ << "(" << state << ")";
 949   DCHECK(main_task_runner_->BelongsToCurrentThread());
 950
 951   if (state == WebMediaPlayer::ReadyStateHaveEnoughData && data_source_ &&
 952       data_source_->assume_fully_buffered() &&
 953       network_state_ == WebMediaPlayer::NetworkStateLoading)
 954     SetNetworkState(WebMediaPlayer::NetworkStateLoaded);
 955
 956   ready_state_ = state;
 957   // Always notify to ensure client has the latest value.
 958   client_->readyStateChanged();
 959 }
 960
 961 blink::WebAudioSourceProvider* WebMediaPlayerImpl::audioSourceProvider() {
 962   return audio_source_provider_.get();
 963 }
 964
 965 double WebMediaPlayerImpl::GetPipelineDuration() const {
 966   base::TimeDelta duration = pipeline_.GetMediaDuration();
 967
 968   // Return positive infinity if the resource is unbounded.
 969   // http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#dom-media-duration
 970   if (duration == kInfiniteDuration())
 971     return std::numeric_limits<double>::infinity();
 972
 973   return duration.InSecondsF();
 974 }
 975
 976 void WebMediaPlayerImpl::OnDurationChanged() {
 977   if (ready_state_ == WebMediaPlayer::ReadyStateHaveNothing)
 978     return;
 979
 980   client_->durationChanged();
 981 }
 982
 983 void WebMediaPlayerImpl::OnNaturalSizeChanged(gfx::Size size) {
 984   DCHECK(main_task_runner_->BelongsToCurrentThread());
 985   DCHECK_NE(ready_state_, WebMediaPlayer::ReadyStateHaveNothing);
 986   TRACE_EVENT0("media", "WebMediaPlayerImpl::OnNaturalSizeChanged");
 987
 988   media_log_->AddEvent(
 989       media_log_->CreateVideoSizeSetEvent(size.width(), size.height()));
 990   pipeline_metadata_.natural_size = size;
 991
 992   client_->sizeChanged();
 993 }
 994
 995 void WebMediaPlayerImpl::OnOpacityChanged(bool opaque) {
 996   DCHECK(main_task_runner_->BelongsToCurrentThread());
 997   DCHECK_NE(ready_state_, WebMediaPlayer::ReadyStateHaveNothing);
 998
 999   opaque_ = opaque;
1000   if (video_weblayer_)
1001     video_weblayer_->setOpaque(opaque_);
1002 }
1003
1004 static void GetCurrentFrameAndSignal(
1005     VideoFrameCompositor* compositor,
1006     scoped_refptr<VideoFrame>* video_frame_out,
1007     base::WaitableEvent* event) {
1008   TRACE_EVENT0("media", "GetCurrentFrameAndSignal");
1009   *video_frame_out = compositor->GetCurrentFrameAndUpdateIfStale();
1010   event->Signal();
1011 }
1012
1013 scoped_refptr<VideoFrame>
1014 WebMediaPlayerImpl::GetCurrentFrameFromCompositor() {
1015   TRACE_EVENT0("media", "WebMediaPlayerImpl::GetCurrentFrameFromCompositor");
1016   if (compositor_task_runner_->BelongsToCurrentThread())
1017     return compositor_->GetCurrentFrameAndUpdateIfStale();
1018
1019   // Use a posted task and waitable event instead of a lock otherwise
1020   // WebGL/Canvas can see different content than what the compositor is seeing.
1021   scoped_refptr<VideoFrame> video_frame;
1022   base::WaitableEvent event(false, false);
1023   compositor_task_runner_->PostTask(FROM_HERE,
1024                                     base::Bind(&GetCurrentFrameAndSignal,
1025                                                base::Unretained(compositor_),
1026                                                &video_frame,
1027                                                &event));
1028   event.Wait();
1029   return video_frame;
1030 }
1031
1032 void WebMediaPlayerImpl::UpdatePausedTime() {
1033   DCHECK(main_task_runner_->BelongsToCurrentThread());
1034
1035   // pause() may be called after playback has ended and the HTMLMediaElement
1036   // requires that currentTime() == duration() after ending.  We want to ensure
1037   // |paused_time_| matches currentTime() in this case or a future seek() may
1038   // incorrectly discard what it thinks is a seek to the existing time.
1039   paused_time_ =
1040       ended_ ? pipeline_.GetMediaDuration() : pipeline_.GetMediaTime();
1041 }
1042
1043 }  // namespace media