Use webrtc::DesktopCapturer for screen capturer implementation.

media/video/capture/screen/shared_buffer.h

-// Copyright (c) 2012 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_VIDEO_CAPTURE_SCREEN_SHARED_BUFFER_H_
-#define MEDIA_VIDEO_CAPTURE_SCREEN_SHARED_BUFFER_H_
-
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "base/process.h"
-#include "base/shared_memory.h"
-#include "media/base/media_export.h"
-
-namespace media {
-
-// Represents a memory buffer that can be shared between multiple processes.
-// It is more or less a convenience wrapper around base::SharedMemory providing
-// ref-counted lifetime management and unique buffer identifiers.
-class MEDIA_EXPORT SharedBuffer
-    : public base::RefCountedThreadSafe<SharedBuffer> {
- public:
-  // Creates a new shared memory buffer of the given size and maps it to
-  // the memory of the calling process. If the operation fails for any reason,
-  // ptr() method will return NULL. This constructor set the identifier of this
-  // buffer to 0.
-  explicit SharedBuffer(uint32 size);
-
-  // Opens an existing shared memory buffer and maps it to the memory of
-  // the calling process (in read only mode). If the operation fails for any
-  // reason, ptr() method will return NULL.
-  SharedBuffer(int id, base::SharedMemoryHandle handle, uint32 size);
-
-  // Opens an existing shared memory buffer created by a different process and
-  // maps it to the memory of the calling process (in read only mode). If
-  // the operation fails for any reason, ptr() method will return NULL.
-  SharedBuffer(int id, base::SharedMemoryHandle handle,
-               base::ProcessHandle process, uint32 size);
-
-  // Returns pointer to the beginning of the allocated data buffer. Returns NULL
-  // if the object initialization failed for any reason.
-  void* ptr() const { return shared_memory_.memory(); }
-
-  // Returns handle of the shared memory section containing the allocated
-  // data buffer.
-  base::SharedMemoryHandle handle() const { return shared_memory_.handle(); }
-
-  // Calls SharedMemory::ShareToProcess to share the handle with a different
-  // process.
-  bool ShareToProcess(base::ProcessHandle process,
-                      base::SharedMemoryHandle* new_handle);
-
-  int id() const { return id_; }
-  uint32 size() const { return size_; }
-
-  void set_id(int id) { id_ = id; }
-
- private:
-  friend class base::RefCountedThreadSafe<SharedBuffer>;
-  virtual ~SharedBuffer();
-
-  // Unique identifier of the buffer or 0 if ID hasn't been set.
-  int id_;
-
-  // Shared memory section backing up the buffer.
-  base::SharedMemory shared_memory_;
-
-  // Size of the buffer in bytes.
-  uint32 size_;
-
-  DISALLOW_COPY_AND_ASSIGN(SharedBuffer);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_VIDEO_CAPTURE_SCREEN_SHARED_BUFFER_H_