media/blink/webmediaplayer_impl.cc

// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "media/blink/webmediaplayer_impl.h"

#include <algorithm>
#include <cmath>
#include <limits>
#include <string>
#include <utility>

#include "base/bind.h"
#include "base/callback.h"
#include "base/callback_helpers.h"
#include "base/command_line.h"
#include "base/debug/alias.h"
#include "base/debug/crash_logging.h"
#include "base/metrics/histogram.h"
#include "base/single_thread_task_runner.h"
#include "base/synchronization/waitable_event.h"
#include "base/task_runner_util.h"
#include "base/thread_task_runner_handle.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "cc/blink/web_layer_impl.h"
#include "cc/layers/video_layer.h"
#include "gpu/blink/webgraphicscontext3d_impl.h"
#include "media/audio/null_audio_sink.h"
#include "media/base/bind_to_current_loop.h"
#include "media/base/cdm_context.h"
#include "media/base/limits.h"
#include "media/base/media_log.h"
#include "media/base/media_switches.h"
#include "media/base/text_renderer.h"
#include "media/base/timestamp_constants.h"
#include "media/base/video_frame.h"
#include "media/blink/texttrack_impl.h"
#include "media/blink/webaudiosourceprovider_impl.h"
#include "media/blink/webcontentdecryptionmodule_impl.h"
#include "media/blink/webinbandtexttrack_impl.h"
#include "media/blink/webmediaplayer_delegate.h"
#include "media/blink/webmediaplayer_util.h"
#include "media/blink/webmediasource_impl.h"
#include "media/filters/chunk_demuxer.h"
#include "media/filters/ffmpeg_demuxer.h"
#include "third_party/WebKit/public/platform/WebEncryptedMediaTypes.h"
#include "third_party/WebKit/public/platform/WebMediaPlayerClient.h"
#include "third_party/WebKit/public/platform/WebMediaPlayerEncryptedMediaClient.h"
#include "third_party/WebKit/public/platform/WebMediaSource.h"
#include "third_party/WebKit/public/platform/WebRect.h"
#include "third_party/WebKit/public/platform/WebSize.h"
#include "third_party/WebKit/public/platform/WebString.h"
#include "third_party/WebKit/public/platform/WebURL.h"
#include "third_party/WebKit/public/web/WebDocument.h"
#include "third_party/WebKit/public/web/WebFrame.h"
#include "third_party/WebKit/public/web/WebLocalFrame.h"
#include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
#include "third_party/WebKit/public/web/WebSecurityOrigin.h"
#include "third_party/WebKit/public/web/WebView.h"

using blink::WebCanvas;
using blink::WebMediaPlayer;
using blink::WebRect;
using blink::WebSize;
using blink::WebString;

namespace {

// Limits the range of playback rate.
//
// TODO(kylep): Revisit these.
//
// Vista has substantially lower performance than XP or Windows7.  If you speed
// up a video too much, it can't keep up, and rendering stops updating except on
// the time bar. For really high speeds, audio becomes a bottleneck and we just
// use up the data we have, which may not achieve the speed requested, but will
// not crash the tab.
//
// A very slow speed, ie 0.00000001x, causes the machine to lock up. (It seems
// like a busy loop). It gets unresponsive, although its not completely dead.
//
// Also our timers are not very accurate (especially for ogg), which becomes
// evident at low speeds and on Vista. Since other speeds are risky and outside
// the norms, we think 1/16x to 16x is a safe and useful range for now.
const double kMinRate = 0.0625;
const double kMaxRate = 16.0;

void SetSinkIdOnMediaThread(
    scoped_refptr<media::WebAudioSourceProviderImpl> sink,
    const std::string& device_id,
    const url::Origin& security_origin,
    const media::SwitchOutputDeviceCB& callback) {
  if (sink->GetOutputDevice()) {
    sink->GetOutputDevice()->SwitchOutputDevice(device_id, security_origin,
                                                callback);
  } else {
    callback.Run(media::OUTPUT_DEVICE_STATUS_ERROR_INTERNAL);
  }
}

}  // namespace

namespace media {

class BufferedDataSourceHostImpl;

#define STATIC_ASSERT_MATCHING_ENUM(name, name2)                    \
  static_assert(static_cast<int>(WebMediaPlayer::CORSMode##name) == \
                    static_cast<int>(UrlData::name2),               \
                "mismatching enum values: " #name)
STATIC_ASSERT_MATCHING_ENUM(Unspecified, CORS_UNSPECIFIED);
STATIC_ASSERT_MATCHING_ENUM(Anonymous, CORS_ANONYMOUS);
STATIC_ASSERT_MATCHING_ENUM(UseCredentials, CORS_USE_CREDENTIALS);
#undef STATIC_ASSERT_MATCHING_ENUM

#define BIND_TO_RENDER_LOOP(function) \
  (DCHECK(main_task_runner_->BelongsToCurrentThread()), \
  BindToCurrentLoop(base::Bind(function, AsWeakPtr())))

#define BIND_TO_RENDER_LOOP1(function, arg1) \
  (DCHECK(main_task_runner_->BelongsToCurrentThread()), \
  BindToCurrentLoop(base::Bind(function, AsWeakPtr(), arg1)))

WebMediaPlayerImpl::WebMediaPlayerImpl(
    blink::WebLocalFrame* frame,
    blink::WebMediaPlayerClient* client,
    blink::WebMediaPlayerEncryptedMediaClient* encrypted_client,
    base::WeakPtr<WebMediaPlayerDelegate> delegate,
    scoped_ptr<RendererFactory> renderer_factory,
    CdmFactory* cdm_factory,
    linked_ptr<UrlIndex> url_index,
    const WebMediaPlayerParams& params)
    : frame_(frame),
      network_state_(WebMediaPlayer::NetworkStateEmpty),
      ready_state_(WebMediaPlayer::ReadyStateHaveNothing),
      preload_(BufferedDataSource::AUTO),
      buffering_strategy_(
          BufferedDataSourceInterface::BUFFERING_STRATEGY_NORMAL),
      main_task_runner_(base::ThreadTaskRunnerHandle::Get()),
      media_task_runner_(params.media_task_runner()),
      worker_task_runner_(params.worker_task_runner()),
      media_log_(params.media_log()),
      pipeline_(media_task_runner_, media_log_.get()),
      load_type_(LoadTypeURL),
      opaque_(false),
      playback_rate_(0.0),
      paused_(true),
      seeking_(false),
      pending_suspend_(false),
      pending_time_change_(false),
      pending_resume_(false),
      suspending_(false),
      suspended_(false),
      resuming_(false),
      ended_(false),
      pending_seek_(false),
      should_notify_time_changed_(false),
      client_(client),
      encrypted_client_(encrypted_client),
      delegate_(delegate),
      defer_load_cb_(params.defer_load_cb()),
      context_3d_cb_(params.context_3d_cb()),
      adjust_allocated_memory_cb_(params.adjust_allocated_memory_cb()),
      last_reported_memory_usage_(0),
      supports_save_(true),
      chunk_demuxer_(NULL),
      url_index_(url_index),
      // Threaded compositing isn't enabled universally yet.
      compositor_task_runner_(
          params.compositor_task_runner()
              ? params.compositor_task_runner()
              : base::MessageLoop::current()->task_runner()),
      compositor_(new VideoFrameCompositor(
          compositor_task_runner_,
          BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnNaturalSizeChanged),
          BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnOpacityChanged))),
      encrypted_media_support_(cdm_factory,
                               encrypted_client,
                               params.media_permission(),
                               base::Bind(&WebMediaPlayerImpl::SetCdm,
                                          AsWeakPtr(),
                                          base::Bind(&IgnoreCdmAttached))),
      renderer_factory_(std::move(renderer_factory)) {
  DCHECK(!adjust_allocated_memory_cb_.is_null());

  if (delegate)
    delegate->AddObserver(this);

  media_log_->AddEvent(
      media_log_->CreateEvent(MediaLogEvent::WEBMEDIAPLAYER_CREATED));

  if (params.initial_cdm()) {
    SetCdm(base::Bind(&IgnoreCdmAttached),
           ToWebContentDecryptionModuleImpl(params.initial_cdm())
               ->GetCdmContext());
  }

  // TODO(xhwang): When we use an external Renderer, many methods won't work,
  // e.g. GetCurrentFrameFromCompositor(). See http://crbug.com/434861

  // Use the null sink if no sink was provided.
  audio_source_provider_ = new WebAudioSourceProviderImpl(
      params.audio_renderer_sink().get()
          ? params.audio_renderer_sink()
          : new NullAudioSink(media_task_runner_));
}

WebMediaPlayerImpl::~WebMediaPlayerImpl() {
  client_->setWebLayer(NULL);

  DCHECK(main_task_runner_->BelongsToCurrentThread());

  if (delegate_) {
    delegate_->RemoveObserver(this);
    delegate_->PlayerGone(this);
  }

  // Abort any pending IO so stopping the pipeline doesn't get blocked.
  if (data_source_)
    data_source_->Abort();
  if (chunk_demuxer_) {
    chunk_demuxer_->Shutdown();
    chunk_demuxer_ = NULL;
  }

  renderer_factory_.reset();

  // Make sure to kill the pipeline so there's no more media threads running.
  // Note: stopping the pipeline might block for a long time.
  base::WaitableEvent waiter(false, false);
  pipeline_.Stop(
      base::Bind(&base::WaitableEvent::Signal, base::Unretained(&waiter)));
  waiter.Wait();

  if (last_reported_memory_usage_)
    adjust_allocated_memory_cb_.Run(-last_reported_memory_usage_);

  compositor_task_runner_->DeleteSoon(FROM_HERE, compositor_);

  media_log_->AddEvent(
      media_log_->CreateEvent(MediaLogEvent::WEBMEDIAPLAYER_DESTROYED));
}

void WebMediaPlayerImpl::load(LoadType load_type, const blink::WebURL& url,
                              CORSMode cors_mode) {
  DVLOG(1) << __FUNCTION__ << "(" << load_type << ", " << url << ", "
           << cors_mode << ")";
  if (!defer_load_cb_.is_null()) {
    defer_load_cb_.Run(base::Bind(
        &WebMediaPlayerImpl::DoLoad, AsWeakPtr(), load_type, url, cors_mode));
    return;
  }
  DoLoad(load_type, url, cors_mode);
}

void WebMediaPlayerImpl::DoLoad(LoadType load_type,
                                const blink::WebURL& url,
                                CORSMode cors_mode) {
  DVLOG(1) << __FUNCTION__;
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  GURL gurl(url);
  ReportMetrics(load_type, gurl,
                GURL(frame_->document().securityOrigin().toString()));

  // Set subresource URL for crash reporting.
  base::debug::SetCrashKeyValue("subresource_url", gurl.spec());

  load_type_ = load_type;

  SetNetworkState(WebMediaPlayer::NetworkStateLoading);
  SetReadyState(WebMediaPlayer::ReadyStateHaveNothing);
  media_log_->AddEvent(media_log_->CreateLoadEvent(url.string().utf8()));

  // Media source pipelines can start immediately.
  if (load_type == LoadTypeMediaSource) {
    supports_save_ = false;
    StartPipeline();
    return;
  }

  // Otherwise it's a regular request which requires resolving the URL first.
  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kUseNewMediaCache)) {
    // Remove this when MultiBufferDataSource becomes default.
    LOG(WARNING) << "Using MultibufferDataSource";
    data_source_.reset(new MultibufferDataSource(
        url, static_cast<UrlData::CORSMode>(cors_mode), main_task_runner_,
        url_index_, frame_, media_log_.get(), &buffered_data_source_host_,
        base::Bind(&WebMediaPlayerImpl::NotifyDownloading, AsWeakPtr())));
  } else {
    data_source_.reset(new BufferedDataSource(
        url, static_cast<BufferedResourceLoader::CORSMode>(cors_mode),
        main_task_runner_, frame_, media_log_.get(),
        &buffered_data_source_host_,
        base::Bind(&WebMediaPlayerImpl::NotifyDownloading, AsWeakPtr())));
  }
  data_source_->SetPreload(preload_);
  data_source_->SetBufferingStrategy(buffering_strategy_);
  data_source_->Initialize(
      base::Bind(&WebMediaPlayerImpl::DataSourceInitialized, AsWeakPtr()));
}

void WebMediaPlayerImpl::play() {
  DVLOG(1) << __FUNCTION__;
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  paused_ = false;
  pipeline_.SetPlaybackRate(playback_rate_);
  if (data_source_)
    data_source_->MediaIsPlaying();

  media_log_->AddEvent(media_log_->CreateEvent(MediaLogEvent::PLAY));

  if (delegate_ && playback_rate_ > 0)
    NotifyPlaybackStarted();
}

void WebMediaPlayerImpl::pause() {
  DVLOG(1) << __FUNCTION__;
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  const bool was_already_paused = paused_ || playback_rate_ == 0;
  paused_ = true;
  pipeline_.SetPlaybackRate(0.0);
  UpdatePausedTime();

  media_log_->AddEvent(media_log_->CreateEvent(MediaLogEvent::PAUSE));

  if (!was_already_paused && delegate_)
    NotifyPlaybackPaused();
}

bool WebMediaPlayerImpl::supportsSave() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  return supports_save_;
}

void WebMediaPlayerImpl::seek(double seconds) {
  DVLOG(1) << __FUNCTION__ << "(" << seconds << "s)";
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  ended_ = false;

  ReadyState old_state = ready_state_;
  if (ready_state_ > WebMediaPlayer::ReadyStateHaveMetadata)
    SetReadyState(WebMediaPlayer::ReadyStateHaveMetadata);

  base::TimeDelta new_seek_time = base::TimeDelta::FromSecondsD(seconds);

  if (seeking_ || suspended_) {
    // Once resuming, it's too late to change the resume time and so the
    // implementation is a little different.
    bool is_suspended = suspended_ && !resuming_;

    // If we are currently seeking or resuming to |new_seek_time|, skip the
    // seek (except for MSE, which always seeks).
    if (!is_suspended && new_seek_time == seek_time_) {
      if (chunk_demuxer_) {
        // Don't suppress any redundant in-progress MSE seek. There could have
        // been changes to the underlying buffers after seeking the demuxer and
        // before receiving OnPipelineSeeked() for the currently in-progress
        // seek.
        MEDIA_LOG(DEBUG, media_log_)
            << "Detected MediaSource seek to same time as in-progress seek to "
            << seek_time_ << ".";
      } else {
        // Suppress all redundant seeks if unrestricted by media source demuxer
        // API.
        pending_seek_ = false;
        pending_seek_time_ = base::TimeDelta();
        return;
      }
    }

    // If |chunk_demuxer_| is already seeking, cancel that seek and schedule the
    // new one.
    if (!is_suspended && chunk_demuxer_)
      chunk_demuxer_->CancelPendingSeek(new_seek_time);

    // Schedule a seek once the current suspend or seek finishes.
    pending_seek_ = true;
    pending_seek_time_ = new_seek_time;

    // In the case of seeking while suspended, the seek is considered to have
    // started immediately (but won't complete until the pipeline is resumed).
    if (is_suspended) {
      seeking_ = true;
      seek_time_ = new_seek_time;
    }

    return;
  }

  media_log_->AddEvent(media_log_->CreateSeekEvent(seconds));

  // Update our paused time.
  // For non-MSE playbacks, in paused state ignore the seek operations to
  // current time if the loading is completed and generate
  // OnPipelineBufferingStateChanged event to eventually fire seeking and seeked
  // events. We don't short-circuit MSE seeks in this logic because the
  // underlying buffers around the seek time might have changed (or even been
  // removed) since previous seek/preroll/pause action, and the pipeline might
  // need to flush so the new buffers are decoded and rendered instead of the
  // old ones.
  if (paused_) {
    if (paused_time_ != new_seek_time || chunk_demuxer_) {
      paused_time_ = new_seek_time;
    } else if (old_state == ReadyStateHaveEnoughData) {
      main_task_runner_->PostTask(
          FROM_HERE,
          base::Bind(&WebMediaPlayerImpl::OnPipelineBufferingStateChanged,
                     AsWeakPtr(), BUFFERING_HAVE_ENOUGH));
      return;
    }
  }

  seeking_ = true;
  seek_time_ = new_seek_time;

  if (chunk_demuxer_)
    chunk_demuxer_->StartWaitingForSeek(seek_time_);

  // Kick off the asynchronous seek!
  pipeline_.Seek(seek_time_, BIND_TO_RENDER_LOOP1(
                                 &WebMediaPlayerImpl::OnPipelineSeeked, true));
}

void WebMediaPlayerImpl::setRate(double rate) {
  DVLOG(1) << __FUNCTION__ << "(" << rate << ")";
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  // TODO(kylep): Remove when support for negatives is added. Also, modify the
  // following checks so rewind uses reasonable values also.
  if (rate < 0.0)
    return;

  // Limit rates to reasonable values by clamping.
  if (rate != 0.0) {
    if (rate < kMinRate)
      rate = kMinRate;
    else if (rate > kMaxRate)
      rate = kMaxRate;
    if (playback_rate_ == 0 && !paused_ && delegate_)
      NotifyPlaybackStarted();
  } else if (playback_rate_ != 0 && !paused_ && delegate_) {
    NotifyPlaybackPaused();
  }

  playback_rate_ = rate;
  if (!paused_) {
    pipeline_.SetPlaybackRate(rate);
    if (data_source_)
      data_source_->MediaPlaybackRateChanged(rate);
  }
}

void WebMediaPlayerImpl::setVolume(double volume) {
  DVLOG(1) << __FUNCTION__ << "(" << volume << ")";
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  pipeline_.SetVolume(volume);
}

void WebMediaPlayerImpl::setSinkId(
    const blink::WebString& sink_id,
    const blink::WebSecurityOrigin& security_origin,
    blink::WebSetSinkIdCallbacks* web_callback) {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  DVLOG(1) << __FUNCTION__;

  media::SwitchOutputDeviceCB callback =
      media::ConvertToSwitchOutputDeviceCB(web_callback);
  media_task_runner_->PostTask(
      FROM_HERE,
      base::Bind(&SetSinkIdOnMediaThread, audio_source_provider_,
                 sink_id.utf8(), static_cast<url::Origin>(security_origin),
                 callback));
}

#define STATIC_ASSERT_MATCHING_ENUM(webkit_name, chromium_name) \
    static_assert(static_cast<int>(WebMediaPlayer::webkit_name) == \
                  static_cast<int>(BufferedDataSource::chromium_name), \
                  "mismatching enum values: " #webkit_name)
STATIC_ASSERT_MATCHING_ENUM(PreloadNone, NONE);
STATIC_ASSERT_MATCHING_ENUM(PreloadMetaData, METADATA);
STATIC_ASSERT_MATCHING_ENUM(PreloadAuto, AUTO);
#undef STATIC_ASSERT_MATCHING_ENUM

void WebMediaPlayerImpl::setPreload(WebMediaPlayer::Preload preload) {
  DVLOG(1) << __FUNCTION__ << "(" << preload << ")";
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  preload_ = static_cast<BufferedDataSource::Preload>(preload);
  if (data_source_)
    data_source_->SetPreload(preload_);
}

#define STATIC_ASSERT_MATCHING_ENUM(webkit_name, chromium_name)          \
  static_assert(static_cast<int>(WebMediaPlayer::webkit_name) ==         \
                    static_cast<int>(BufferedDataSource::chromium_name), \
                "mismatching enum values: " #webkit_name)
STATIC_ASSERT_MATCHING_ENUM(BufferingStrategy::Normal,
                            BUFFERING_STRATEGY_NORMAL);
STATIC_ASSERT_MATCHING_ENUM(BufferingStrategy::Aggressive,
                            BUFFERING_STRATEGY_AGGRESSIVE);
#undef STATIC_ASSERT_MATCHING_ENUM

void WebMediaPlayerImpl::setBufferingStrategy(
    WebMediaPlayer::BufferingStrategy buffering_strategy) {
  DVLOG(1) << __FUNCTION__;
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  buffering_strategy_ =
      static_cast<BufferedDataSource::BufferingStrategy>(buffering_strategy);
  if (data_source_)
    data_source_->SetBufferingStrategy(buffering_strategy_);
}

bool WebMediaPlayerImpl::hasVideo() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  return pipeline_metadata_.has_video;
}

bool WebMediaPlayerImpl::hasAudio() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  return pipeline_metadata_.has_audio;
}

blink::WebSize WebMediaPlayerImpl::naturalSize() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  return blink::WebSize(pipeline_metadata_.natural_size);
}

bool WebMediaPlayerImpl::paused() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  return pipeline_.GetPlaybackRate() == 0.0f;
}

bool WebMediaPlayerImpl::seeking() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  if (ready_state_ == WebMediaPlayer::ReadyStateHaveNothing)
    return false;

  return seeking_;
}

double WebMediaPlayerImpl::duration() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  if (ready_state_ == WebMediaPlayer::ReadyStateHaveNothing)
    return std::numeric_limits<double>::quiet_NaN();

  return GetPipelineDuration();
}

double WebMediaPlayerImpl::timelineOffset() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  if (pipeline_metadata_.timeline_offset.is_null())
    return std::numeric_limits<double>::quiet_NaN();

  return pipeline_metadata_.timeline_offset.ToJsTime();
}

double WebMediaPlayerImpl::currentTime() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  DCHECK_NE(ready_state_, WebMediaPlayer::ReadyStateHaveNothing);

  // TODO(scherkus): Replace with an explicit ended signal to HTMLMediaElement,
  // see http://crbug.com/409280
  if (ended_)
    return duration();

  // We know the current seek time better than pipeline: pipeline may processing
  // an earlier seek before a pending seek has been started, or it might not yet
  // have the current seek time returnable via GetMediaTime().
  if (seeking()) {
    return pending_seek_ ? pending_seek_time_.InSecondsF()
                         : seek_time_.InSecondsF();
  }

  return (paused_ ? paused_time_ : pipeline_.GetMediaTime()).InSecondsF();
}

WebMediaPlayer::NetworkState WebMediaPlayerImpl::networkState() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  return network_state_;
}

WebMediaPlayer::ReadyState WebMediaPlayerImpl::readyState() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  return ready_state_;
}

blink::WebTimeRanges WebMediaPlayerImpl::buffered() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  Ranges<base::TimeDelta> buffered_time_ranges =
      pipeline_.GetBufferedTimeRanges();

  const base::TimeDelta duration = pipeline_.GetMediaDuration();
  if (duration != kInfiniteDuration()) {
    buffered_data_source_host_.AddBufferedTimeRanges(
        &buffered_time_ranges, duration);
  }
  return ConvertToWebTimeRanges(buffered_time_ranges);
}

blink::WebTimeRanges WebMediaPlayerImpl::seekable() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  if (ready_state_ < WebMediaPlayer::ReadyStateHaveMetadata)
    return blink::WebTimeRanges();

  const double seekable_end = duration();

  // Allow a special exception for seeks to zero for streaming sources with a
  // finite duration; this allows looping to work.
  const bool allow_seek_to_zero = data_source_ && data_source_->IsStreaming() &&
                                  std::isfinite(seekable_end);

  // TODO(dalecurtis): Technically this allows seeking on media which return an
  // infinite duration so long as DataSource::IsStreaming() is false.  While not
  // expected, disabling this breaks semi-live players, http://crbug.com/427412.
  const blink::WebTimeRange seekable_range(
      0.0, allow_seek_to_zero ? 0.0 : seekable_end);
  return blink::WebTimeRanges(&seekable_range, 1);
}

bool WebMediaPlayerImpl::didLoadingProgress() {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  bool pipeline_progress = pipeline_.DidLoadingProgress();
  bool data_progress = buffered_data_source_host_.DidLoadingProgress();
  return pipeline_progress || data_progress;
}

void WebMediaPlayerImpl::paint(blink::WebCanvas* canvas,
                               const blink::WebRect& rect,
                               unsigned char alpha,
                               SkXfermode::Mode mode) {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  TRACE_EVENT0("media", "WebMediaPlayerImpl:paint");

  // TODO(scherkus): Clarify paint() API contract to better understand when and
  // why it's being called. For example, today paint() is called when:
  //   - We haven't reached HAVE_CURRENT_DATA and need to paint black
  //   - We're painting to a canvas
  // See http://crbug.com/341225 http://crbug.com/342621 for details.
  scoped_refptr<VideoFrame> video_frame = GetCurrentFrameFromCompositor();

  gfx::Rect gfx_rect(rect);
  Context3D context_3d;
  if (video_frame.get() && video_frame->HasTextures()) {
    if (!context_3d_cb_.is_null())
      context_3d = context_3d_cb_.Run();
    // GPU Process crashed.
    if (!context_3d.gl)
      return;
  }
  skcanvas_video_renderer_.Paint(video_frame, canvas, gfx::RectF(gfx_rect),
                                 alpha, mode, pipeline_metadata_.video_rotation,
                                 context_3d);
}

bool WebMediaPlayerImpl::hasSingleSecurityOrigin() const {
  if (data_source_)
    return data_source_->HasSingleOrigin();
  return true;
}

bool WebMediaPlayerImpl::didPassCORSAccessCheck() const {
  if (data_source_)
    return data_source_->DidPassCORSAccessCheck();
  return false;
}

double WebMediaPlayerImpl::mediaTimeForTimeValue(double timeValue) const {
  return base::TimeDelta::FromSecondsD(timeValue).InSecondsF();
}

unsigned WebMediaPlayerImpl::decodedFrameCount() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  PipelineStatistics stats = pipeline_.GetStatistics();
  return stats.video_frames_decoded;
}

unsigned WebMediaPlayerImpl::droppedFrameCount() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  PipelineStatistics stats = pipeline_.GetStatistics();
  return stats.video_frames_dropped;
}

unsigned WebMediaPlayerImpl::audioDecodedByteCount() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  PipelineStatistics stats = pipeline_.GetStatistics();
  return stats.audio_bytes_decoded;
}

unsigned WebMediaPlayerImpl::videoDecodedByteCount() const {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  PipelineStatistics stats = pipeline_.GetStatistics();
  return stats.video_bytes_decoded;
}

bool WebMediaPlayerImpl::copyVideoTextureToPlatformTexture(
    blink::WebGraphicsContext3D* web_graphics_context,
    unsigned int texture,
    unsigned int internal_format,
    unsigned int type,
    bool premultiply_alpha,
    bool flip_y) {
  TRACE_EVENT0("media", "WebMediaPlayerImpl:copyVideoTextureToPlatformTexture");

  scoped_refptr<VideoFrame> video_frame = GetCurrentFrameFromCompositor();

  if (!video_frame.get() || !video_frame->HasTextures() ||
      media::VideoFrame::NumPlanes(video_frame->format()) != 1) {
    return false;
  }

  // TODO(dshwang): need more elegant way to convert WebGraphicsContext3D to
  // GLES2Interface.
  gpu::gles2::GLES2Interface* gl =
      static_cast<gpu_blink::WebGraphicsContext3DImpl*>(web_graphics_context)
          ->GetGLInterface();
  SkCanvasVideoRenderer::CopyVideoFrameSingleTextureToGLTexture(
      gl, video_frame.get(), texture, internal_format, type, premultiply_alpha,
      flip_y);
  return true;
}

WebMediaPlayer::MediaKeyException
WebMediaPlayerImpl::generateKeyRequest(const WebString& key_system,
                                       const unsigned char* init_data,
                                       unsigned init_data_length) {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  return encrypted_media_support_.GenerateKeyRequest(
      frame_, key_system, init_data, init_data_length);
}

WebMediaPlayer::MediaKeyException WebMediaPlayerImpl::addKey(
    const WebString& key_system,
    const unsigned char* key,
    unsigned key_length,
    const unsigned char* init_data,
    unsigned init_data_length,
    const WebString& session_id) {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  return encrypted_media_support_.AddKey(
      key_system, key, key_length, init_data, init_data_length, session_id);
}

WebMediaPlayer::MediaKeyException WebMediaPlayerImpl::cancelKeyRequest(
    const WebString& key_system,
    const WebString& session_id) {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  return encrypted_media_support_.CancelKeyRequest(key_system, session_id);
}

void WebMediaPlayerImpl::setContentDecryptionModule(
    blink::WebContentDecryptionModule* cdm,
    blink::WebContentDecryptionModuleResult result) {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  // Once the CDM is set it can't be cleared as there may be frames being
  // decrypted on other threads. So fail this request.
  // http://crbug.com/462365#c7.
  if (!cdm) {
    result.completeWithError(
        blink::WebContentDecryptionModuleExceptionInvalidStateError, 0,
        "The existing MediaKeys object cannot be removed at this time.");
    return;
  }

  // Although unlikely, it is possible that multiple calls happen
  // simultaneously, so fail this call if there is already one pending.
  if (set_cdm_result_) {
    result.completeWithError(
        blink::WebContentDecryptionModuleExceptionInvalidStateError, 0,
        "Unable to set MediaKeys object at this time.");
    return;
  }

  // Create a local copy of |result| to avoid problems with the callback
  // getting passed to the media thread and causing |result| to be destructed
  // on the wrong thread in some failure conditions.
  set_cdm_result_.reset(new blink::WebContentDecryptionModuleResult(result));

  SetCdm(BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnCdmAttached),
         ToWebContentDecryptionModuleImpl(cdm)->GetCdmContext());
}

void WebMediaPlayerImpl::OnEncryptedMediaInitData(
    EmeInitDataType init_data_type,
    const std::vector<uint8_t>& init_data) {
  DCHECK(init_data_type != EmeInitDataType::UNKNOWN);

  // Do not fire "encrypted" event if encrypted media is not enabled.
  // TODO(xhwang): Handle this in |client_|.
  if (!blink::WebRuntimeFeatures::isPrefixedEncryptedMediaEnabled() &&
      !blink::WebRuntimeFeatures::isEncryptedMediaEnabled()) {
    return;
  }

  // TODO(xhwang): Update this UMA name.
  UMA_HISTOGRAM_COUNTS("Media.EME.NeedKey", 1);

  encrypted_media_support_.SetInitDataType(init_data_type);

  encrypted_client_->encrypted(
      ConvertToWebInitDataType(init_data_type), init_data.data(),
      base::saturated_cast<unsigned int>(init_data.size()));
}

void WebMediaPlayerImpl::OnWaitingForDecryptionKey() {
  encrypted_client_->didBlockPlaybackWaitingForKey();

  // TODO(jrummell): didResumePlaybackBlockedForKey() should only be called
  // when a key has been successfully added (e.g. OnSessionKeysChange() with
  // |has_additional_usable_key| = true). http://crbug.com/461903
  encrypted_client_->didResumePlaybackBlockedForKey();
}

void WebMediaPlayerImpl::SetCdm(const CdmAttachedCB& cdm_attached_cb,
                                CdmContext* cdm_context) {
  // If CDM initialization succeeded, tell the pipeline about it.
  if (cdm_context)
    pipeline_.SetCdm(cdm_context, cdm_attached_cb);
}

void WebMediaPlayerImpl::OnCdmAttached(bool success) {
  if (success) {
    set_cdm_result_->complete();
    set_cdm_result_.reset();
    return;
  }

  set_cdm_result_->completeWithError(
      blink::WebContentDecryptionModuleExceptionNotSupportedError, 0,
      "Unable to set MediaKeys object");
  set_cdm_result_.reset();
}

void WebMediaPlayerImpl::OnPipelineSeeked(bool time_changed,
                                          PipelineStatus status) {
  DVLOG(1) << __FUNCTION__ << "(" << time_changed << ", " << status << ")";
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  if (status != PIPELINE_OK) {
    OnPipelineError(status);
    return;
  }

  // Whether or not the seek was caused by a resume, we're not suspended now.
  resuming_ = false;
  suspended_ = false;

  // If there is a pending suspend, the seek does not complete until after the
  // next resume.
  if (pending_suspend_) {
    pending_suspend_ = false;
    pending_time_change_ = time_changed;
    Suspend();
    return;
  }

  // Clear seek state. Note that if the seek was caused by a resume, then
  // |seek_time_| is always set but |seeking_| is only set if there was a
  // pending seek at the time.
  seeking_ = false;
  seek_time_ = base::TimeDelta();

  if (pending_seek_) {
    double pending_seek_seconds = pending_seek_time_.InSecondsF();
    pending_seek_ = false;
    pending_seek_time_ = base::TimeDelta();
    seek(pending_seek_seconds);
    return;
  }

  // Update our paused time.
  if (paused_)
    UpdatePausedTime();

  should_notify_time_changed_ = time_changed;
}

void WebMediaPlayerImpl::OnPipelineSuspended(PipelineStatus status) {
  DVLOG(1) << __FUNCTION__ << "(" << status << ")";
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  if (status != PIPELINE_OK) {
    OnPipelineError(status);
    return;
  }

  suspending_ = false;

  if (pending_resume_) {
    pending_resume_ = false;
    Resume();
    return;
  }
}

void WebMediaPlayerImpl::OnPipelineEnded() {
  DVLOG(1) << __FUNCTION__;
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  // Ignore state changes until we've completed all outstanding seeks.
  if (seeking_ || pending_seek_)
    return;

  ended_ = true;
  client_->timeChanged();
}

void WebMediaPlayerImpl::OnPipelineError(PipelineStatus error) {
  DVLOG(1) << __FUNCTION__;
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  DCHECK_NE(error, PIPELINE_OK);

  if (ready_state_ == WebMediaPlayer::ReadyStateHaveNothing) {
    // Any error that occurs before reaching ReadyStateHaveMetadata should
    // be considered a format error.
    SetNetworkState(WebMediaPlayer::NetworkStateFormatError);
    return;
  }

  SetNetworkState(PipelineErrorToNetworkState(error));
}

void WebMediaPlayerImpl::OnPipelineMetadata(
    PipelineMetadata metadata) {
  DVLOG(1) << __FUNCTION__;

  pipeline_metadata_ = metadata;

  UMA_HISTOGRAM_ENUMERATION("Media.VideoRotation", metadata.video_rotation,
                            VIDEO_ROTATION_MAX + 1);
  SetReadyState(WebMediaPlayer::ReadyStateHaveMetadata);

  if (hasVideo()) {
    DCHECK(!video_weblayer_);
    scoped_refptr<cc::VideoLayer> layer =
        cc::VideoLayer::Create(cc_blink::WebLayerImpl::LayerSettings(),
                               compositor_, pipeline_metadata_.video_rotation);

    if (pipeline_metadata_.video_rotation == VIDEO_ROTATION_90 ||
        pipeline_metadata_.video_rotation == VIDEO_ROTATION_270) {
      gfx::Size size = pipeline_metadata_.natural_size;
      pipeline_metadata_.natural_size = gfx::Size(size.height(), size.width());
    }

    video_weblayer_.reset(new cc_blink::WebLayerImpl(layer));
    video_weblayer_->layer()->SetContentsOpaque(opaque_);
    video_weblayer_->SetContentsOpaqueIsFixed(true);
    client_->setWebLayer(video_weblayer_.get());
  }
}

void WebMediaPlayerImpl::OnPipelineBufferingStateChanged(
    BufferingState buffering_state) {
  DVLOG(1) << __FUNCTION__ << "(" << buffering_state << ")";

  // Ignore buffering state changes until we've completed all outstanding seeks.
  if (seeking_ || pending_seek_)
    return;

  // TODO(scherkus): Handle other buffering states when Pipeline starts using
  // them and translate them ready state changes http://crbug.com/144683
  DCHECK_EQ(buffering_state, BUFFERING_HAVE_ENOUGH);
  SetReadyState(WebMediaPlayer::ReadyStateHaveEnoughData);

  // Let the DataSource know we have enough data. It may use this information to
  // release unused network connections.
  if (data_source_)
    data_source_->OnBufferingHaveEnough();

  // Blink expects a timeChanged() in response to a seek().
  if (should_notify_time_changed_)
    client_->timeChanged();

  // Once we have enough, start reporting the total memory usage. We'll also
  // report once playback starts.
  ReportMemoryUsage();
}

void WebMediaPlayerImpl::OnDemuxerOpened() {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  client_->mediaSourceOpened(
      new WebMediaSourceImpl(chunk_demuxer_, media_log_));
}

void WebMediaPlayerImpl::OnAddTextTrack(
    const TextTrackConfig& config,
    const AddTextTrackDoneCB& done_cb) {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  const WebInbandTextTrackImpl::Kind web_kind =
      static_cast<WebInbandTextTrackImpl::Kind>(config.kind());
  const blink::WebString web_label =
      blink::WebString::fromUTF8(config.label());
  const blink::WebString web_language =
      blink::WebString::fromUTF8(config.language());
  const blink::WebString web_id =
      blink::WebString::fromUTF8(config.id());

  scoped_ptr<WebInbandTextTrackImpl> web_inband_text_track(
      new WebInbandTextTrackImpl(web_kind, web_label, web_language, web_id));

  scoped_ptr<TextTrack> text_track(new TextTrackImpl(
      main_task_runner_, client_, std::move(web_inband_text_track)));

  done_cb.Run(std::move(text_track));
}

void WebMediaPlayerImpl::OnHidden() {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

#if !defined(OS_ANDROID)
  // Suspend/Resume is enabled by default on Android.
  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kEnableMediaSuspend)) {
    return;
  }
#endif  // !defined(OS_ANDROID)

  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kDisableMediaSuspend)) {
    return;
  }

  if (!pipeline_.IsRunning())
    return;

  if (resuming_ || seeking_) {
    pending_suspend_ = true;
    return;
  }

  if (pending_resume_) {
    pending_resume_ = false;
    return;
  }

  Suspend();
}

void WebMediaPlayerImpl::Suspend() {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  CHECK(!suspended_);
  suspended_ = true;
  suspending_ = true;
  pipeline_.Suspend(
      BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineSuspended));
}

void WebMediaPlayerImpl::OnShown() {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

#if !defined(OS_ANDROID)
  // Suspend/Resume is enabled by default on Android.
  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kEnableMediaSuspend)) {
    return;
  }
#endif  // !defined(OS_ANDROID)

  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
          switches::kDisableMediaSuspend)) {
    return;
  }

  if (!pipeline_.IsRunning())
    return;

  if (suspending_) {
    pending_resume_ = true;
    return;
  }

  if (pending_suspend_) {
    pending_suspend_ = false;
    return;
  }

  // We may not be suspended if we were not yet subscribed or the pipeline was
  // not yet started when OnHidden() fired.
  if (!suspended_)
    return;

  Resume();
}

void WebMediaPlayerImpl::Resume() {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  CHECK(suspended_);
  CHECK(!resuming_);

  // If there was a time change pending when we suspended (which can happen when
  // we suspend immediately after a seek), surface it after resuming.
  bool time_changed = pending_time_change_;
  pending_time_change_ = false;

  if (seeking_ || pending_seek_) {
    if (pending_seek_) {
      seek_time_ = pending_seek_time_;
      pending_seek_ = false;
      pending_seek_time_ = base::TimeDelta();
    }
    time_changed = true;
  } else {
    // It is safe to call GetCurrentFrameTimestamp() because VFC is stopped
    // during Suspend(). It won't be started again until after Resume() is
    // called.
    seek_time_ = compositor_->GetCurrentFrameTimestamp();
  }

  if (chunk_demuxer_)
    chunk_demuxer_->StartWaitingForSeek(seek_time_);

  resuming_ = true;
  pipeline_.Resume(CreateRenderer(), seek_time_,
                   BIND_TO_RENDER_LOOP1(&WebMediaPlayerImpl::OnPipelineSeeked,
                                        time_changed));
}

void WebMediaPlayerImpl::DataSourceInitialized(bool success) {
  DVLOG(1) << __FUNCTION__;
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  if (!success) {
    SetNetworkState(WebMediaPlayer::NetworkStateFormatError);
    return;
  }

  StartPipeline();
}

void WebMediaPlayerImpl::NotifyDownloading(bool is_downloading) {
  DVLOG(1) << __FUNCTION__;
  if (!is_downloading && network_state_ == WebMediaPlayer::NetworkStateLoading)
    SetNetworkState(WebMediaPlayer::NetworkStateIdle);
  else if (is_downloading && network_state_ == WebMediaPlayer::NetworkStateIdle)
    SetNetworkState(WebMediaPlayer::NetworkStateLoading);
  media_log_->AddEvent(
      media_log_->CreateBooleanEvent(
          MediaLogEvent::NETWORK_ACTIVITY_SET,
          "is_downloading_data", is_downloading));
}

scoped_ptr<Renderer> WebMediaPlayerImpl::CreateRenderer() {
  return renderer_factory_->CreateRenderer(
      media_task_runner_, worker_task_runner_, audio_source_provider_.get(),
      compositor_);
}

void WebMediaPlayerImpl::StartPipeline() {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  Demuxer::EncryptedMediaInitDataCB encrypted_media_init_data_cb =
      BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnEncryptedMediaInitData);

  // Figure out which demuxer to use.
  if (load_type_ != LoadTypeMediaSource) {
    DCHECK(!chunk_demuxer_);
    DCHECK(data_source_);

#if !defined(MEDIA_DISABLE_FFMPEG)
    demuxer_.reset(new FFmpegDemuxer(media_task_runner_, data_source_.get(),
                                     encrypted_media_init_data_cb, media_log_));
#else
    OnPipelineError(PipelineStatus::DEMUXER_ERROR_COULD_NOT_OPEN);
    return;
#endif
  } else {
    DCHECK(!chunk_demuxer_);
    DCHECK(!data_source_);

    chunk_demuxer_ = new ChunkDemuxer(
        BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnDemuxerOpened),
        encrypted_media_init_data_cb, media_log_, true);
    demuxer_.reset(chunk_demuxer_);
  }

  // ... and we're ready to go!
  seeking_ = true;

  // TODO(sandersd): On Android, defer Start() if the tab is not visible.
  pipeline_.Start(
      demuxer_.get(), CreateRenderer(),
      BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineEnded),
      BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineError),
      BIND_TO_RENDER_LOOP1(&WebMediaPlayerImpl::OnPipelineSeeked, false),
      BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineMetadata),
      BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineBufferingStateChanged),
      BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnDurationChanged),
      BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnAddTextTrack),
      BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnWaitingForDecryptionKey));
}

void WebMediaPlayerImpl::SetNetworkState(WebMediaPlayer::NetworkState state) {
  DVLOG(1) << __FUNCTION__ << "(" << state << ")";
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  network_state_ = state;
  // Always notify to ensure client has the latest value.
  client_->networkStateChanged();
}

void WebMediaPlayerImpl::SetReadyState(WebMediaPlayer::ReadyState state) {
  DVLOG(1) << __FUNCTION__ << "(" << state << ")";
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  if (state == WebMediaPlayer::ReadyStateHaveEnoughData && data_source_ &&
      data_source_->assume_fully_buffered() &&
      network_state_ == WebMediaPlayer::NetworkStateLoading)
    SetNetworkState(WebMediaPlayer::NetworkStateLoaded);

  ready_state_ = state;
  // Always notify to ensure client has the latest value.
  client_->readyStateChanged();
}

blink::WebAudioSourceProvider* WebMediaPlayerImpl::audioSourceProvider() {
  return audio_source_provider_.get();
}

double WebMediaPlayerImpl::GetPipelineDuration() const {
  base::TimeDelta duration = pipeline_.GetMediaDuration();

  // Return positive infinity if the resource is unbounded.
  // http://www.whatwg.org/specs/web-apps/current-work/multipage/video.html#dom-media-duration
  if (duration == kInfiniteDuration())
    return std::numeric_limits<double>::infinity();

  return duration.InSecondsF();
}

void WebMediaPlayerImpl::OnDurationChanged() {
  if (ready_state_ == WebMediaPlayer::ReadyStateHaveNothing)
    return;

  client_->durationChanged();
}

void WebMediaPlayerImpl::OnNaturalSizeChanged(gfx::Size size) {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  DCHECK_NE(ready_state_, WebMediaPlayer::ReadyStateHaveNothing);
  TRACE_EVENT0("media", "WebMediaPlayerImpl::OnNaturalSizeChanged");

  media_log_->AddEvent(
      media_log_->CreateVideoSizeSetEvent(size.width(), size.height()));
  pipeline_metadata_.natural_size = size;

  client_->sizeChanged();
}

void WebMediaPlayerImpl::OnOpacityChanged(bool opaque) {
  DCHECK(main_task_runner_->BelongsToCurrentThread());
  DCHECK_NE(ready_state_, WebMediaPlayer::ReadyStateHaveNothing);

  opaque_ = opaque;
  // Modify content opaqueness of cc::Layer directly so that
  // SetContentsOpaqueIsFixed is ignored.
  if (video_weblayer_)
    video_weblayer_->layer()->SetContentsOpaque(opaque_);
}

static void GetCurrentFrameAndSignal(
    VideoFrameCompositor* compositor,
    scoped_refptr<VideoFrame>* video_frame_out,
    base::WaitableEvent* event) {
  TRACE_EVENT0("media", "GetCurrentFrameAndSignal");
  *video_frame_out = compositor->GetCurrentFrameAndUpdateIfStale();
  event->Signal();
}

scoped_refptr<VideoFrame>
WebMediaPlayerImpl::GetCurrentFrameFromCompositor() {
  TRACE_EVENT0("media", "WebMediaPlayerImpl::GetCurrentFrameFromCompositor");
  if (compositor_task_runner_->BelongsToCurrentThread())
    return compositor_->GetCurrentFrameAndUpdateIfStale();

  // Use a posted task and waitable event instead of a lock otherwise
  // WebGL/Canvas can see different content than what the compositor is seeing.
  scoped_refptr<VideoFrame> video_frame;
  base::WaitableEvent event(false, false);
  compositor_task_runner_->PostTask(FROM_HERE,
                                    base::Bind(&GetCurrentFrameAndSignal,
                                               base::Unretained(compositor_),
                                               &video_frame,
                                               &event));
  event.Wait();
  return video_frame;
}

void WebMediaPlayerImpl::UpdatePausedTime() {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  // pause() may be called after playback has ended and the HTMLMediaElement
  // requires that currentTime() == duration() after ending.  We want to ensure
  // |paused_time_| matches currentTime() in this case or a future seek() may
  // incorrectly discard what it thinks is a seek to the existing time.
  paused_time_ =
      ended_ ? pipeline_.GetMediaDuration() : pipeline_.GetMediaTime();
}

void WebMediaPlayerImpl::NotifyPlaybackStarted() {
  if (delegate_)
    delegate_->DidPlay(this);
  if (!memory_usage_reporting_timer_.IsRunning()) {
    memory_usage_reporting_timer_.Start(FROM_HERE,
                                        base::TimeDelta::FromSeconds(2), this,
                                        &WebMediaPlayerImpl::ReportMemoryUsage);
  }
}

void WebMediaPlayerImpl::NotifyPlaybackPaused() {
  if (delegate_)
    delegate_->DidPause(this);
  memory_usage_reporting_timer_.Stop();
  ReportMemoryUsage();
}

void WebMediaPlayerImpl::ReportMemoryUsage() {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  // About base::Unretained() usage below: We destroy |demuxer_| on the main
  // thread.  Before that, however, ~WebMediaPlayerImpl() posts a task to the
  // media thread and waits for it to finish.  Hence, the GetMemoryUsage() task
  // posted here must finish earlier.

  if (demuxer_) {
    base::PostTaskAndReplyWithResult(
        media_task_runner_.get(), FROM_HERE,
        base::Bind(&Demuxer::GetMemoryUsage, base::Unretained(demuxer_.get())),
        base::Bind(&WebMediaPlayerImpl::FinishMemoryUsageReport, AsWeakPtr()));
  } else {
    FinishMemoryUsageReport(0);
  }
}

void WebMediaPlayerImpl::FinishMemoryUsageReport(int64_t demuxer_memory_usage) {
  DCHECK(main_task_runner_->BelongsToCurrentThread());

  const PipelineStatistics stats = pipeline_.GetStatistics();
  const int64_t current_memory_usage =
      stats.audio_memory_usage + stats.video_memory_usage +
      (data_source_ ? data_source_->GetMemoryUsage() : 0) +
      demuxer_memory_usage;

  DVLOG(2) << "Memory Usage -- Audio: " << stats.audio_memory_usage
           << ", Video: " << stats.video_memory_usage << ", DataSource: "
           << (data_source_ ? data_source_->GetMemoryUsage() : 0)
           << ", Demuxer: " << demuxer_memory_usage;

  const int64_t delta = current_memory_usage - last_reported_memory_usage_;
  last_reported_memory_usage_ = current_memory_usage;
  adjust_allocated_memory_cb_.Run(delta);
}

}  // namespace media