media: scaffolding and plumbing for MojoRenderer{Impl, Service}

media/mojo/services/mojo_demuxer_stream_impl.h

+// Copyright 2014 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_DEMUXER_STREAM_IMPL_H_
+#define MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_IMPL_H_
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "media/base/demuxer_stream.h"
+#include "media/mojo/interfaces/demuxer_stream.mojom.h"
+#include "mojo/public/cpp/bindings/interface_impl.h"
+
+namespace media {
+class DemuxerStream;
+
+// This class wraps a media::DemuxerStream and exposes it as a
+// mojo::DemuxerStream for use as a proxy from remote applications.
+class MojoDemuxerStreamImpl : public mojo::InterfaceImpl<mojo::DemuxerStream> {
+ public:
+  // |stream| is the underlying DemuxerStream we are proxying for.
+  // Note: |this| does not take ownership of |stream|.
+  explicit MojoDemuxerStreamImpl(media::DemuxerStream* stream);
+  virtual ~MojoDemuxerStreamImpl();
+
+  // mojo::DemuxerStream implementation.
+  virtual void Read(const mojo::Callback<
+      void(mojo::DemuxerStream::Status, mojo::MediaDecoderBufferPtr)>& callback)
+      OVERRIDE;
+
+  // mojo::InterfaceImpl overrides.
+  virtual void OnConnectionEstablished() OVERRIDE;
+
+ private:
+  // |callback| is the callback that was passed to the initiating Read()
+  //     call by our client.
+  // |status| and |buffer| are the standard media::ReadCB parameters.
+  typedef mojo::Callback<void(mojo::DemuxerStream::Status,
+                              mojo::MediaDecoderBufferPtr)> BufferReadyCB;
+  void OnBufferReady(const BufferReadyCB& callback,
+                     media::DemuxerStream::Status status,
+                     const scoped_refptr<media::DecoderBuffer>& buffer);
+
+  // See constructor.  We do not own |stream_|.
+  media::DemuxerStream* stream_;
+
+  base::WeakPtrFactory<MojoDemuxerStreamImpl> weak_factory_;
+  DISALLOW_COPY_AND_ASSIGN(MojoDemuxerStreamImpl);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MOJO_SERVICES_MOJO_DEMUXER_STREAM_IMPL_H_