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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=99: */
/* 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 "RemoteVideoDecoder.h"
#include "VideoDecoderChild.h"
#include "VideoDecoderManagerChild.h"
#include "mozilla/layers/TextureClient.h"
#include "base/thread.h"
#include "MediaInfo.h"
#include "MediaPrefs.h"
#include "ImageContainer.h"
#include "mozilla/layers/SynchronousTask.h"

namespace mozilla {
namespace dom {

using base::Thread;
using namespace ipc;
using namespace layers;
using namespace gfx;

RemoteVideoDecoder::RemoteVideoDecoder()
    : mActor(new VideoDecoderChild()), mDescription("RemoteVideoDecoder") {}

RemoteVideoDecoder::~RemoteVideoDecoder() {
  // We're about to be destroyed and drop our ref to
  // VideoDecoderChild. Make sure we put a ref into the
  // task queue for the VideoDecoderChild thread to keep
  // it alive until we send the delete message.
  RefPtr<VideoDecoderChild> actor = mActor;

  RefPtr<Runnable> task = NS_NewRunnableFunction(
      "dom::RemoteVideoDecoder::~RemoteVideoDecoder", [actor]() {
        MOZ_ASSERT(actor);
        actor->DestroyIPDL();
      });

  // Drop out references to the actor so that the last ref
  // always gets released on the manager thread.
  actor = nullptr;
  mActor = nullptr;

  VideoDecoderManagerChild::GetManagerThread()->Dispatch(task.forget(),
                                                         NS_DISPATCH_NORMAL);
}

RefPtr<MediaDataDecoder::InitPromise> RemoteVideoDecoder::Init() {
  RefPtr<RemoteVideoDecoder> self = this;
  return InvokeAsync(VideoDecoderManagerChild::GetManagerAbstractThread(),
                     __func__, [self]() { return self->mActor->Init(); })
      ->Then(VideoDecoderManagerChild::GetManagerAbstractThread(), __func__,
             [self, this](TrackType aTrack) {
               mDescription = mActor->GetDescriptionName() +
                              NS_LITERAL_CSTRING(" (remote)");
               mIsHardwareAccelerated =
                   mActor->IsHardwareAccelerated(mHardwareAcceleratedReason);
               mConversion = mActor->NeedsConversion();
               return InitPromise::CreateAndResolve(aTrack, __func__);
             },
             [self](const MediaResult& aError) {
               return InitPromise::CreateAndReject(aError, __func__);
             });
}

RefPtr<MediaDataDecoder::DecodePromise> RemoteVideoDecoder::Decode(
    MediaRawData* aSample) {
  RefPtr<RemoteVideoDecoder> self = this;
  RefPtr<MediaRawData> sample = aSample;
  return InvokeAsync(VideoDecoderManagerChild::GetManagerAbstractThread(),
                     __func__,
                     [self, sample]() { return self->mActor->Decode(sample); });
}

RefPtr<MediaDataDecoder::FlushPromise> RemoteVideoDecoder::Flush() {
  RefPtr<RemoteVideoDecoder> self = this;
  return InvokeAsync(VideoDecoderManagerChild::GetManagerAbstractThread(),
                     __func__, [self]() { return self->mActor->Flush(); });
}

RefPtr<MediaDataDecoder::DecodePromise> RemoteVideoDecoder::Drain() {
  RefPtr<RemoteVideoDecoder> self = this;
  return InvokeAsync(VideoDecoderManagerChild::GetManagerAbstractThread(),
                     __func__, [self]() { return self->mActor->Drain(); });
}

RefPtr<ShutdownPromise> RemoteVideoDecoder::Shutdown() {
  RefPtr<RemoteVideoDecoder> self = this;
  return InvokeAsync(VideoDecoderManagerChild::GetManagerAbstractThread(),
                     __func__, [self]() {
                       self->mActor->Shutdown();
                       return ShutdownPromise::CreateAndResolve(true, __func__);
                     });
}

bool RemoteVideoDecoder::IsHardwareAccelerated(
    nsACString& aFailureReason) const {
  aFailureReason = mHardwareAcceleratedReason;
  return mIsHardwareAccelerated;
}

void RemoteVideoDecoder::SetSeekThreshold(const media::TimeUnit& aTime) {
  RefPtr<RemoteVideoDecoder> self = this;
  media::TimeUnit time = aTime;
  VideoDecoderManagerChild::GetManagerThread()->Dispatch(
      NS_NewRunnableFunction("dom::RemoteVideoDecoder::SetSeekThreshold",
                             [=]() {
                               MOZ_ASSERT(self->mActor);
                               self->mActor->SetSeekThreshold(time);
                             }),
      NS_DISPATCH_NORMAL);
}

MediaDataDecoder::ConversionRequired RemoteVideoDecoder::NeedsConversion()
    const {
  return mConversion;
}

nsresult RemoteDecoderModule::Startup() {
  if (!VideoDecoderManagerChild::GetManagerThread()) {
    return NS_ERROR_FAILURE;
  }
  return mWrapped->Startup();
}

bool RemoteDecoderModule::SupportsMimeType(
    const nsACString& aMimeType, DecoderDoctorDiagnostics* aDiagnostics) const {
  return mWrapped->SupportsMimeType(aMimeType, aDiagnostics);
}

bool RemoteDecoderModule::Supports(
    const TrackInfo& aTrackInfo, DecoderDoctorDiagnostics* aDiagnostics) const {
  return mWrapped->Supports(aTrackInfo, aDiagnostics);
}

static inline bool IsRemoteAcceleratedCompositor(KnowsCompositor* aKnows) {
  TextureFactoryIdentifier ident = aKnows->GetTextureFactoryIdentifier();
  return ident.mParentBackend != LayersBackend::LAYERS_BASIC &&
         ident.mParentProcessType == GeckoProcessType_GPU;
}

already_AddRefed<MediaDataDecoder> RemoteDecoderModule::CreateVideoDecoder(
    const CreateDecoderParams& aParams) {
  if (!MediaPrefs::PDMUseGPUDecoder() || !aParams.mKnowsCompositor ||
      !IsRemoteAcceleratedCompositor(aParams.mKnowsCompositor)) {
    return mWrapped->CreateVideoDecoder(aParams);
  }

  RefPtr<RemoteVideoDecoder> object = new RemoteVideoDecoder();

  SynchronousTask task("InitIPDL");
  MediaResult result(NS_OK);
  VideoDecoderManagerChild::GetManagerThread()->Dispatch(
      NS_NewRunnableFunction(
          "dom::RemoteDecoderModule::CreateVideoDecoder",
          [&]() {
            AutoCompleteTask complete(&task);
            result = object->mActor->InitIPDL(
                aParams.VideoConfig(), aParams.mRate.mValue,
                aParams.mKnowsCompositor->GetTextureFactoryIdentifier());
          }),
      NS_DISPATCH_NORMAL);
  task.Wait();

  if (NS_FAILED(result)) {
    if (aParams.mError) {
      *aParams.mError = result;
    }
    return nullptr;
  }

  return object.forget();
}

nsCString RemoteVideoDecoder::GetDescriptionName() const {
  return mDescription;
}

}  // namespace dom
}  // namespace mozilla