[PPAPI][MediaStream] Rename AudioFrame to AudioBuffer

ppapi/shared_impl/media_stream_frame_buffer.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 PPAPI_SHARED_IMPL_MEDIA_STREAM_FRAME_BUFFER_H_
-#define PPAPI_SHARED_IMPL_MEDIA_STREAM_FRAME_BUFFER_H_
-
-#include <deque>
-#include <vector>
-
-#include "base/compiler_specific.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/memory/shared_memory.h"
-#include "ppapi/shared_impl/media_stream_frame.h"
-#include "ppapi/shared_impl/ppapi_shared_export.h"
-
-namespace ppapi {
-
-// This class is used by both read side and write side of a MediaStreamTrack to
-// maintain a queue of frames for reading or writing.
-//
-// An example:
-//  1. The writer calls the writer's |frame_buffer_.Dequeue()| to get a free
-//     frame.
-//  2. The writer fills data into the frame.
-//  3. The writer sends the frame index to the reader via an IPC message.
-//  4. The reader receives the frame index and calls the reader's
-//     |frame_buffer.Enqueue()| to put the frame into the read's queue.
-//  5. The reader calls reader's |frame_buffer_.Dequeue()| to get a received
-//     frame.
-//  6. When the frame from the step 5 is consumed, the reader sends the frame
-//     index back to writer via an IPC message.
-//  7. The writer receives the frame index and puts it back to the writer's free
-//     frame queue by calling the writer's |frame_buffer_.Enqueue()|.
-//  8. Go back to step 1.
-class PPAPI_SHARED_EXPORT MediaStreamFrameBuffer {
- public:
-  class PPAPI_SHARED_EXPORT Delegate {
-   public:
-    virtual ~Delegate();
-    // It is called when a new frame is enqueued.
-    virtual void OnNewFrameEnqueued();
-  };
-
-  // MediaStreamFrameBuffer doesn't own |delegate|, the caller should keep
-  // it alive during the MediaStreamFrameBuffer's lifecycle.
-  explicit MediaStreamFrameBuffer(Delegate* delegate);
-
-  ~MediaStreamFrameBuffer();
-
-  int32_t number_of_frames() const { return number_of_frames_; }
-
-  int32_t frame_size() const { return frame_size_; }
-
-  // Initializes shared memory for frames transmission.
-  bool SetFrames(int32_t number_of_frames,
-                 int32_t frame_size,
-                 scoped_ptr<base::SharedMemory> shm,
-                 bool enqueue_all_frames);
-
-  // Dequeues a frame from |frame_queue_|.
-  int32_t DequeueFrame();
-
-  // Puts a frame into |frame_queue_|.
-  void EnqueueFrame(int32_t index);
-
-  // Gets the frame address for the given frame index.
-  MediaStreamFrame* GetFramePointer(int32_t index);
-
- private:
-  Delegate* delegate_;
-
-  // A queue of frame indexes.
-  std::deque<int32_t> frame_queue_;
-
-  // A vector of frame pointers. It is used for index to pointer converting.
-  std::vector<MediaStreamFrame*> frames_;
-
-  // The frame size in bytes.
-  int32_t frame_size_;
-
-  // The number of frames in the shared memory.
-  int32_t number_of_frames_;
-
-  // A memory block shared between renderer process and plugin process.
-  scoped_ptr<base::SharedMemory> shm_;
-
-  DISALLOW_COPY_AND_ASSIGN(MediaStreamFrameBuffer);
-};
-
-}  // namespace ppapi
-
-#endif  // PPAPI_SHAERD_IMPL_MEDIA_STREAM_FRAME_BUFFER_H_