Use data pipe to pass DecoderBuffer contents

media/mojo/services/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_SERVICES_MOJO_DECRYPTOR_H_
 #define MEDIA_MOJO_SERVICES_MOJO_DECRYPTOR_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.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 MojoDecryptor : public Decryptor {
  public:
   explicit MojoDecryptor(interfaces::DecryptorPtr remote_decryptor);
   ~MojoDecryptor() final;
 
   // Decryptor implementation.
   void RegisterNewKeyCB(StreamType stream_type,
@@ skipping 21 matching lines @@
   void OnBufferDecrypted(const DecryptCB& decrypt_cb,
                          interfaces::Decryptor::Status status,
                          interfaces::DecoderBufferPtr buffer);
   void OnAudioDecoded(const AudioDecodeCB& audio_decode_cb,
                       interfaces::Decryptor::Status status,
                       mojo::Array<interfaces::AudioBufferPtr> audio_buffers);
   void OnVideoDecoded(const VideoDecodeCB& video_decode_cb,
                       interfaces::Decryptor::Status status,
                       interfaces::VideoFramePtr video_frame);
 
+  // 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.
+  interfaces::DecoderBufferPtr TransferDecoderBuffer(
+      const scoped_refptr<DecoderBuffer>& buffer);
+  scoped_refptr<DecoderBuffer> ReadDecoderBuffer(
+      interfaces::DecoderBufferPtr buffer);
+
   interfaces::DecryptorPtr remote_decryptor_;
 
+  // DataPipes for serializing the data section of DecoderBuffer into/from.
+  mojo::ScopedDataPipeProducerHandle producer_handle_;
+  mojo::ScopedDataPipeConsumerHandle consumer_handle_;
+
   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_SERVICES_MOJO_DECRYPTOR_H_