Introduce media::RendererFactory interface.

media/filters/default_renderer_factory.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_FILTERS_DEFAULT_RENDERER_FACTORY_H_
+#define MEDIA_FILTERS_DEFAULT_RENDERER_FACTORY_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "media/base/media_export.h"
+#include "media/base/renderer_factory.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+}
+
+namespace media {
+
+class AudioHardwareConfig;
+class AudioRendererSink;
+class GpuVideoAcceleratorFactories;
+class MediaLog;
+
+// The default factory class for creating RendererImpl.
+class MEDIA_EXPORT DefaultRendererFactory : public RendererFactory {
+ public:
+  // Callback for media embedders to create an external Renderer.
+  // Note: Ideally we should do this in MediaClient. However,
+  // ContentRendererClient::CreateMediaRenderer() requires a RenderFrame.
+  // Even though RenderFrame can be obtained with a blink::WebLocalFrame, it
+  // seems bad to pollute MediaClient and DefaultRendererFactory with blink
+  // types only for this reason.
+  typedef base::Callback<scoped_ptr<Renderer>(
+      const scoped_refptr<base::SingleThreadTaskRunner>&)>

[DaleCurtis, 2014/12/08 22:12:09]

Does this need a parameter? It looks like you could just bind it in at creation
time.

[xhwang, 2014/12/08 23:44:09]

Done.

+      ExternalRendererCreationCB;
+
+  DefaultRendererFactory(
+      const ExternalRendererCreationCB& external_renderer_creation_cb,
+      const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
+      const scoped_refptr<MediaLog>& media_log,
+      const scoped_refptr<GpuVideoAcceleratorFactories>& gpu_factories,
+      const AudioHardwareConfig& audio_hardware_config);
+  ~DefaultRendererFactory() final;
+
+  scoped_ptr<Renderer> CreateRenderer(
+      AudioRendererSink* audio_renderer_sink) final;
+
+ private:
+  ExternalRendererCreationCB external_renderer_creation_cb_;
+
+  scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
+  scoped_refptr<MediaLog> media_log_;
+
+  // Factories for supporting video accelerators. May be null.
+  scoped_refptr<GpuVideoAcceleratorFactories> gpu_factories_;
+
+  const AudioHardwareConfig& audio_hardware_config_;
+
+  DISALLOW_COPY_AND_ASSIGN(DefaultRendererFactory);
+};
+
+}  // namespace media
+
+#endif  // MEDIA_FILTERS_DEFAULT_RENDERER_FACTORY_H_