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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/. */
#ifndef include_dom_ipc_RemoteVideoDecoder_h
#define include_dom_ipc_RemoteVideoDecoder_h

#include "mozilla/RefPtr.h"
#include "mozilla/DebugOnly.h"
#include "MediaData.h"
#include "PlatformDecoderModule.h"

namespace mozilla {

namespace dom {
class RemoteVideoDecoder;
}
DDLoggedTypeCustomNameAndBase(dom::RemoteVideoDecoder, RemoteVideoDecoder,
                              MediaDataDecoder);

namespace dom {

class VideoDecoderChild;
class RemoteDecoderModule;

// A MediaDataDecoder implementation that proxies through IPDL
// to a 'real' decoder in the GPU process.
// All requests get forwarded to a VideoDecoderChild instance that
// operates solely on the VideoDecoderManagerChild thread.
class RemoteVideoDecoder : public MediaDataDecoder,
                           public DecoderDoctorLifeLogger<RemoteVideoDecoder> {
 public:
  friend class RemoteDecoderModule;

  // MediaDataDecoder
  RefPtr<InitPromise> Init() override;
  RefPtr<DecodePromise> Decode(MediaRawData* aSample) override;
  RefPtr<DecodePromise> Drain() override;
  RefPtr<FlushPromise> Flush() override;
  RefPtr<ShutdownPromise> Shutdown() override;
  bool IsHardwareAccelerated(nsACString& aFailureReason) const override;
  void SetSeekThreshold(const media::TimeUnit& aTime) override;
  nsCString GetDescriptionName() const override;
  ConversionRequired NeedsConversion() const override;

 private:
  RemoteVideoDecoder();
  ~RemoteVideoDecoder();

  // Only ever written to from the reader task queue (during the constructor and
  // destructor when we can guarantee no other threads are accessing it). Only
  // read from the manager thread.
  RefPtr<VideoDecoderChild> mActor;
  // Only ever written/modified during decoder initialisation.
  // As such can be accessed from any threads after that.
  nsCString mDescription;
  bool mIsHardwareAccelerated;
  nsCString mHardwareAcceleratedReason;
  MediaDataDecoder::ConversionRequired mConversion;
};

// A PDM implementation that creates RemoteVideoDecoders.
// We currently require a 'wrapped' PDM in order to be able to answer
// SupportsMimeType and DecoderNeedsConversion. Ideally we'd check these over
// IPDL using the manager protocol
class RemoteDecoderModule : public PlatformDecoderModule {
 public:
  explicit RemoteDecoderModule(PlatformDecoderModule* aWrapped)
      : mWrapped(aWrapped) {}

  nsresult Startup() override;

  bool SupportsMimeType(const nsACString& aMimeType,
                        DecoderDoctorDiagnostics* aDiagnostics) const override;
  bool Supports(const TrackInfo& aTrackInfo,
                DecoderDoctorDiagnostics* aDiagnostics) const override;

  already_AddRefed<MediaDataDecoder> CreateVideoDecoder(
      const CreateDecoderParams& aParams) override;

  already_AddRefed<MediaDataDecoder> CreateAudioDecoder(
      const CreateDecoderParams& aParams) override {
    return nullptr;
  }

 private:
  RefPtr<PlatformDecoderModule> mWrapped;
};

}  // namespace dom
}  // namespace mozilla

#endif  // include_dom_ipc_RemoteVideoDecoder_h