gecko-dev/dom/media/platforms/PDMFactory.h

/* -*- 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/. */

#if !defined(PDMFactory_h_)
#define PDMFactory_h_

#include "PlatformDecoderModule.h"
#include "mozilla/StaticMutex.h"

class CDMProxy;

namespace mozilla {

class DecoderDoctorDiagnostics;
class PDMFactoryImpl;
template<class T> class StaticAutoPtr;

class PDMFactory final
{
public:
  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(PDMFactory)

  PDMFactory();

  // Factory method that creates the appropriate PlatformDecoderModule for
  // the platform we're running on. Caller is responsible for deleting this
  // instance. It's expected that there will be multiple
  // PlatformDecoderModules alive at the same time.
  // This is called on the decode task queue.
  already_AddRefed<MediaDataDecoder>
  CreateDecoder(const CreateDecoderParams& aParams);

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

  // Creates a PlatformDecoderModule that uses a CDMProxy to decrypt or
  // decrypt-and-decode EME encrypted content. If the CDM only decrypts and
  // does not decode, we create a PDM and use that to create MediaDataDecoders
  // that we use on on aTaskQueue to decode the decrypted stream.
  // This is called on the decode task queue.
  void SetCDMProxy(CDMProxy* aProxy);

  static constexpr int kYUV400 = 0;
  static constexpr int kYUV420 = 1;
  static constexpr int kYUV422 = 2;
  static constexpr int kYUV444 = 3;

private:
  virtual ~PDMFactory();
  void CreatePDMs();
  void CreateNullPDM();
  // Startup the provided PDM and add it to our list if successful.
  bool StartupPDM(PlatformDecoderModule* aPDM, bool aInsertAtBeginning = false);
  // Returns the first PDM in our list supporting the mimetype.
  already_AddRefed<PlatformDecoderModule>
  GetDecoder(const TrackInfo& aTrackInfo,
             DecoderDoctorDiagnostics* aDiagnostics) const;

  already_AddRefed<MediaDataDecoder>
  CreateDecoderWithPDM(PlatformDecoderModule* aPDM,
                       const CreateDecoderParams& aParams);

  nsTArray<RefPtr<PlatformDecoderModule>> mCurrentPDMs;
  RefPtr<PlatformDecoderModule> mEMEPDM;
  RefPtr<PlatformDecoderModule> mNullPDM;

  bool mWMFFailedToLoad = false;
  bool mFFmpegFailedToLoad = false;
  bool mGMPPDMFailedToStartup = false;

  void EnsureInit() const;
  template<class T> friend class StaticAutoPtr;
  static StaticAutoPtr<PDMFactoryImpl> sInstance;
  static StaticMutex sMonitor;
};

} // namespace mozilla

#endif /* PDMFactory_h_ */