[Cast] Refactor ExternalVideoEncoder for cleaner/simpler encapsulation.

media/cast/sender/fake_video_encode_accelerator_factory.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_CAST_SENDER_FAKE_VIDEO_ENCODE_ACCELERATOR_FACTORY_H_
+#define MEDIA_CAST_SENDER_FAKE_VIDEO_ENCODE_ACCELERATOR_FACTORY_H_
+
+#include "base/callback.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/shared_memory.h"
+#include "base/single_thread_task_runner.h"
+#include "media/cast/cast_config.h"
+#include "media/video/fake_video_encode_accelerator.h"
+
+namespace media {
+namespace cast {
+
+// Used by test code to create fake VideoEncodeAccelerators.  The test code
+// controls when the response callback is invoked.
+class FakeVideoEncodeAcceleratorFactory {
+ public:
+  explicit FakeVideoEncodeAcceleratorFactory(
+      const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
+  ~FakeVideoEncodeAcceleratorFactory();
+
+  int vea_response_count() const {
+    return vea_response_count_;
+  }
+  int shm_response_count() const {
+    return shm_response_count_;
+  }
+
+  // These return the instance last responded.  It is up to the caller to
+  // determine whether the pointer is still valid, since this factory does not
+  // own these objects anymore.
+  media::FakeVideoEncodeAccelerator* last_response_vea() const {
+    return static_cast<media::FakeVideoEncodeAccelerator*>(last_response_vea_);
+  }
+  base::SharedMemory* last_response_shm() const {
+    return last_response_shm_;
+  }
+
+  // Set whether the next created media::FakeVideoEncodeAccelerator will
+  // initialize successfully.
+  void SetInitializationWillSucceed(bool will_init_succeed);
+
+  // Enable/disable auto-respond mode.  Default is disabled.
+  void SetAutoRespond(bool auto_respond);
+
+  // Creates a media::FakeVideoEncodeAccelerator.  If in auto-respond mode,
+  // |callback| is run synchronously (i.e., before this method returns).
+  void CreateVideoEncodeAccelerator(
+      const ReceiveVideoEncodeAcceleratorCallback& callback);
+
+  // Creates shared memory of the requested |size|.  If in auto-respond mode,
+  // |callback| is run synchronously (i.e., before this method returns).
+  void CreateSharedMemory(
+      size_t size,
+      const ReceiveVideoEncodeMemoryCallback& callback);
+
+  // Runs the |callback| provided to the last call to
+  // CreateVideoEncodeAccelerator() with the new VideoEncodeAccelerator
+  // instance.
+  void RespondWithVideoEncodeAccelerator();
+
+  // Runs the |callback| provided to the last call to
+  // CreateSharedMemory() with the new base::SharedMemory instance.
+  void RespondWithSharedMemory();
+
+ private:
+  const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  bool will_init_succeed_;
+  bool auto_respond_;
+  scoped_ptr<media::VideoEncodeAccelerator> next_response_vea_;
+  ReceiveVideoEncodeAcceleratorCallback vea_response_callback_;
+  scoped_ptr<base::SharedMemory> next_response_shm_;
+  ReceiveVideoEncodeMemoryCallback shm_response_callback_;
+  int vea_response_count_;
+  int shm_response_count_;
+  media::VideoEncodeAccelerator* last_response_vea_;
+  base::SharedMemory* last_response_shm_;
+
+  DISALLOW_COPY_AND_ASSIGN(FakeVideoEncodeAcceleratorFactory);
+};
+
+}  // namespace cast
+}  // namespace media
+
+#endif  // MEDIA_CAST_SENDER_FAKE_VIDEO_ENCODE_ACCELERATOR_FACTORY_H_