gecko-dev/dom/media/fmp4/SharedDecoderManager.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "SharedDecoderManager.h"
#include "mp4_demuxer/DecoderData.h"

namespace mozilla {

class SharedDecoderCallback : public MediaDataDecoderCallback
{
public:
  explicit SharedDecoderCallback(SharedDecoderManager* aManager) : mManager(aManager) {}

  virtual void Output(MediaData* aData) MOZ_OVERRIDE
  {
    if (mManager->mActiveCallback) {
      mManager->mActiveCallback->Output(aData);
    }
  }
  virtual void Error() MOZ_OVERRIDE
  {
    if (mManager->mActiveCallback) {
      mManager->mActiveCallback->Error();
    }
  }
  virtual void InputExhausted() MOZ_OVERRIDE
  {
    if (mManager->mActiveCallback) {
      mManager->mActiveCallback->InputExhausted();
    }
  }
  virtual void DrainComplete() MOZ_OVERRIDE
  {
    if (mManager->mActiveCallback) {
      mManager->DrainComplete();
    }
  }
  virtual void NotifyResourcesStatusChanged() MOZ_OVERRIDE
  {
    if (mManager->mActiveCallback) {
      mManager->mActiveCallback->NotifyResourcesStatusChanged();
    }
  }
  virtual void ReleaseMediaResources() MOZ_OVERRIDE
  {
    if (mManager->mActiveCallback) {
      mManager->mActiveCallback->ReleaseMediaResources();
    }
  }

  SharedDecoderManager* mManager;
};

SharedDecoderManager::SharedDecoderManager()
  : mActiveProxy(nullptr)
  , mActiveCallback(nullptr)
  , mWaitForInternalDrain(false)
  , mMonitor("SharedDecoderProxy")
{
  mCallback = new SharedDecoderCallback(this);
}

SharedDecoderManager::~SharedDecoderManager() {}

already_AddRefed<MediaDataDecoder>
SharedDecoderManager::CreateVideoDecoder(
  const mp4_demuxer::VideoDecoderConfig& aConfig,
  layers::LayersBackend aLayersBackend, layers::ImageContainer* aImageContainer,
  MediaTaskQueue* aVideoTaskQueue, MediaDataDecoderCallback* aCallback)
{
  if (!mDecoder) {
    nsRefPtr<PlatformDecoderModule> platform(PlatformDecoderModule::Create());
    mDecoder = platform->CreateVideoDecoder(
      aConfig, aLayersBackend, aImageContainer, aVideoTaskQueue, mCallback);
    if (!mDecoder) {
      return nullptr;
    }
    nsresult rv = mDecoder->Init();
    NS_ENSURE_SUCCESS(rv, nullptr);
  }

  nsRefPtr<SharedDecoderProxy> proxy(new SharedDecoderProxy(this, aCallback));
  return proxy.forget();
}

void
SharedDecoderManager::Select(SharedDecoderProxy* aProxy)
{
  if (mActiveProxy == aProxy) {
    return;
  }
  SetIdle(mActiveProxy);

  mActiveProxy = aProxy;
  mActiveCallback = aProxy->mCallback;
}

void
SharedDecoderManager::SetIdle(MediaDataDecoder* aProxy)
{
  if (aProxy && mActiveProxy == aProxy) {
    mWaitForInternalDrain = true;
    mActiveProxy->Drain();
    MonitorAutoLock mon(mMonitor);
    while (mWaitForInternalDrain) {
      mon.Wait();
    }
    mActiveProxy->Flush();
    mActiveProxy = nullptr;
  }
}

void
SharedDecoderManager::DrainComplete()
{
  if (mWaitForInternalDrain) {
    MonitorAutoLock mon(mMonitor);
    mWaitForInternalDrain = false;
    mon.NotifyAll();
  } else {
    mActiveCallback->DrainComplete();
  }
}

SharedDecoderProxy::SharedDecoderProxy(
  SharedDecoderManager* aManager, MediaDataDecoderCallback* aCallback)
  : mManager(aManager), mCallback(aCallback)
{
}

SharedDecoderProxy::~SharedDecoderProxy() { Shutdown(); }

nsresult
SharedDecoderProxy::Init()
{
  return NS_OK;
}

nsresult
SharedDecoderProxy::Input(mp4_demuxer::MP4Sample* aSample)
{
  if (mManager->mActiveProxy != this) {
    mManager->Select(this);
  }
  return mManager->mDecoder->Input(aSample);
  return NS_OK;
}

nsresult
SharedDecoderProxy::Flush()
{
  if (mManager->mActiveProxy == this) {
    return mManager->mDecoder->Flush();
  }
  return NS_OK;
}

nsresult
SharedDecoderProxy::Drain()
{
  if (mManager->mActiveProxy == this) {
    return mManager->mDecoder->Drain();
  }
  return NS_OK;
}

nsresult
SharedDecoderProxy::Shutdown()
{
  mManager->SetIdle(this);
  return NS_OK;
}

bool
SharedDecoderProxy::IsWaitingMediaResources()
{
  if (mManager->mActiveProxy == this) {
    return mManager->mDecoder->IsWaitingMediaResources();
  }
  return mManager->mActiveProxy != nullptr;
}

bool
SharedDecoderProxy::IsDormantNeeded()
{
  return mManager->mDecoder->IsDormantNeeded();
}

void
SharedDecoderProxy::ReleaseMediaResources()
{
  if (mManager->mActiveProxy == this) {
    mManager->mDecoder->ReleaseMediaResources();
  }
}

void
SharedDecoderProxy::ReleaseDecoder()
{
  if (mManager->mActiveProxy == this) {
    mManager->mDecoder->ReleaseMediaResources();
  }
}
}