ppapi: add helper methods to MediaStreamBufferManager

ppapi/shared_impl/media_stream_buffer_manager.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_BUFFER_MANAGER_H_
 #define PPAPI_SHARED_IMPL_MEDIA_STREAM_BUFFER_MANAGER_H_
 
 #include <deque>
 #include <vector>
 
@@ skipping 35 matching lines @@
   // MediaStreamBufferManager doesn't own |delegate|, the caller should keep
   // it alive during the MediaStreamBufferManager's lifecycle.
   explicit MediaStreamBufferManager(Delegate* delegate);
 
   ~MediaStreamBufferManager();
 
   int32_t number_of_buffers() const { return number_of_buffers_; }
 
   int32_t buffer_size() const { return buffer_size_; }
 
+  base::SharedMemory* shm() { return shm_.get(); }
+
   // Initializes shared memory for buffers transmission.
   bool SetBuffers(int32_t number_of_buffers,
                   int32_t buffer_size,
                   scoped_ptr<base::SharedMemory> shm,
                   bool enqueue_all_buffers);
 
+  // Number of buffers available.
+  int32 BuffersAvailable();
+
   // Dequeues a buffer from |buffer_queue_|.
   int32_t DequeueBuffer();
 
   // Dequeues all the buffers from |buffer_queue_|.
   std::vector<int32_t> DequeueBuffers();
 
   // Puts a buffer into |buffer_queue_|.
   void EnqueueBuffer(int32_t index);
 
   // Gets the buffer address for the given buffer index.
   MediaStreamBuffer* GetBufferPointer(int32_t index);
 
+  // Checks whether |buffer| is contains in the buffer manager.
+  bool ContainsBuffer(MediaStreamBuffer* buffer);
+
  private:
   Delegate* delegate_;
 
   // A queue of buffer indices.
   std::deque<int32_t> buffer_queue_;
 
   // A vector of buffer pointers. It is used for index to pointer converting.
   std::vector<MediaStreamBuffer*> buffers_;
 
   // The buffer size in bytes.
   int32_t buffer_size_;
 
   // The number of buffers in the shared memory.
   int32_t number_of_buffers_;
 
   // A memory block shared between renderer process and plugin process.
   scoped_ptr<base::SharedMemory> shm_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamBufferManager);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHAERD_IMPL_MEDIA_STREAM_BUFFER_MANAGER_H_