GMPDecoderModule.h

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/* -*- 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(GMPDecoderModule_h_)

#  define GMPDecoderModule_h_

#  include "PlatformDecoderModule.h"

#  include "mozilla/Maybe.h"

// The special NodeId we use when doing unencrypted decoding using the GMP's

// decoder. This ensures that each GMP MediaDataDecoder we create doesn't

// require spinning up a new process, but instead we run all instances of

// GMP decoders in the one process, to reduce overhead.

//

// Note: GMP storage is isolated by NodeId, and non persistent for this

// special NodeId, and the only way a GMP can communicate with the outside

// world is through the EME GMP APIs, and we never run EME with this NodeID

// (because NodeIds are random strings which can't contain the '-' character),

// so there's no way a malicious GMP can harvest, store, and then report any

// privacy sensitive data about what users are watching.

#  define SHARED_GMP_DECODING_NODE_ID "gmp-shared-decoding"_ns

namespace mozilla {

class GMPDecoderModule : public PlatformDecoderModule {

  template <typename T, typename... Args>

  friend already_AddRefed<T> MakeAndAddRef(Args&&...);

 public:

  static already_AddRefed<PlatformDecoderModule> Create();

  // Decode thread.

  already_AddRefed<MediaDataDecoder> CreateVideoDecoder(

      const CreateDecoderParams& aParams) override;

  // Decode thread.

  already_AddRefed<MediaDataDecoder> CreateAudioDecoder(

      const CreateDecoderParams& aParams) override;

  media::DecodeSupportSet SupportsMimeType(

      const nsACString& aMimeType,

      DecoderDoctorDiagnostics* aDiagnostics) const override;

  static media::DecodeSupportSet SupportsMimeType(

      const nsACString& aMimeType, const nsACString& aApi,

      const Maybe<nsCString>& aKeySystem);

 private:

  GMPDecoderModule() = default;

  virtual ~GMPDecoderModule() = default;

};

}  // namespace mozilla

#endif  // GMPDecoderModule_h_