Mojify demuxers and allow running {Chunk/FFmpeg}Demuxer in a Utility Process

media/mojo/clients/mojo_data_source_impl.h

+// Copyright 2017 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_DATA_SOURCE_IMPL_H_
+#define MEDIA_MOJO_CLIENTS_MOJO_DATA_SOURCE_IMPL_H_
+
+#include <memory>
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "media/base/data_source.h"
+#include "media/mojo/interfaces/data_source.mojom.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace media {
+
+class DataSource;
+class MojoDataBufferWriter;
+
+// This class wraps a media::DataSource and exposes it as a
+// mojom::DataSource for use as a proxy from remote applications.
+class MojoDataSourceImpl : public mojom::DataSource {
+ public:
+  // |data_source| is the underlying DataSource we are proxying for.
+  // Note: |this| does not take ownership of |data_source|.
+  MojoDataSourceImpl(media::DataSource* data_source,
+                     mojo::InterfaceRequest<mojom::DataSource> request);
+  ~MojoDataSourceImpl() override;
+
+  // mojom::DataSource implementation.
+  void Initialize(const InitializeCallback& callback) final;
+  void Read(int64_t position, int size, const ReadCallback& callback) final;
+  void Stop() final;
+  void Abort() final;
+  void GetSize(const GetSizeCallback& callback) final;
+  void IsStreaming(const IsStreamingCallback& callback) final;
+  void SetBitrate(int bitrate) final;
+
+  // Sets an error handler that will be called if a connection error occurs on
+  // the bound message pipe.
+  void set_connection_error_handler(const base::Closure& error_handler) {
+    binding_.set_connection_error_handler(error_handler);
+  }
+
+ private:
+  void OnRead(const ReadCallback& callback,
+              std::unique_ptr<uint8_t[]> data,
+              int size);
+
+  mojo::Binding<mojom::DataSource> binding_;
+
+  // See constructor.  We do not own |stream_|.
+  media::DataSource* data_source_;
+
+  std::unique_ptr<MojoDataBufferWriter> mojo_data_buffer_writer_;
+
+  base::WeakPtrFactory<MojoDataSourceImpl> weak_factory_;
+  DISALLOW_COPY_AND_ASSIGN(MojoDataSourceImpl);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MOJO_CLIENTS_MOJO_DATA_SOURCE_IMPL_H_