media: Add MojoDecoderBuffer{Reader|Writer}

media/mojo/clients/mojo_decryptor.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_MOJO_CLIENTS_MOJO_DECRYPTOR_H_
 #define MEDIA_MOJO_CLIENTS_MOJO_DECRYPTOR_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/thread_checker.h"
 #include "media/base/decryptor.h"
 #include "media/mojo/interfaces/decryptor.mojom.h"
 #include "mojo/public/cpp/bindings/binding.h"
-#include "mojo/public/cpp/system/data_pipe.h"
 
 namespace media {
 
+class MojoDecoderBufferReader;
+class MojoDecoderBufferWriter;
+
 // A Decryptor implementation based on mojom::DecryptorPtr.
 // This class is single threaded. The |remote_decryptor| is connected before
 // being passed to MojoDecryptor, but it is bound to the thread MojoDecryptor
 // lives on the first time it is used in this class.
 class MojoDecryptor : public Decryptor {
  public:
   explicit MojoDecryptor(mojom::DecryptorPtr remote_decryptor);
   ~MojoDecryptor() final;
 
   // Decryptor implementation.
@@ skipping 26 matching lines @@
                       mojom::Decryptor::Status status,
                       mojo::Array<mojom::AudioBufferPtr> audio_buffers);
   void OnVideoDecoded(const VideoDecodeCB& video_decode_cb,
                       mojom::Decryptor::Status status,
                       mojom::VideoFramePtr video_frame);
 
   // Called when done with a VideoFrame in order to reuse the shared memory.
   void ReleaseSharedBuffer(mojo::ScopedSharedBufferHandle buffer,
                            size_t buffer_size);
 
-  // To pass DecoderBuffers to and from the MojoDecryptorService, 2 data pipes
-  // are required (one each way). At initialization both pipes are created,
-  // and then the handles are passed to the MojoDecryptorService.
-  void CreateDataPipes();
-
-  // Helper functions to write and read a DecoderBuffer.
-  mojom::DecoderBufferPtr TransferDecoderBuffer(
-      const scoped_refptr<DecoderBuffer>& buffer);
-  scoped_refptr<DecoderBuffer> ReadDecoderBuffer(
-      mojom::DecoderBufferPtr buffer);
-
   base::ThreadChecker thread_checker_;
 
   mojom::DecryptorPtr remote_decryptor_;
 
-  // DataPipes for serializing the data section of DecoderBuffer into/from.
-  mojo::ScopedDataPipeProducerHandle producer_handle_;
-  mojo::ScopedDataPipeConsumerHandle consumer_handle_;
+  // Helper class to send DecoderBuffer to the |remote_decryptor_| for decrypt
+  // or decrypt-and-decode.
+  std::unique_ptr<MojoDecoderBufferWriter> mojo_decoder_buffer_writer_;
+
+  // Helper class to receive decrypted DecoderBuffer from the
+  // |remote_decryptor_|.
+  std::unique_ptr<MojoDecoderBufferReader> mojo_decoder_buffer_reader_;
 
   NewKeyCB new_audio_key_cb_;
   NewKeyCB new_video_key_cb_;
 
   base::WeakPtrFactory<MojoDecryptor> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MojoDecryptor);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_MOJO_CLIENTS_MOJO_DECRYPTOR_H_