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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef CONTENT_RENDERER_PEPPER_AUDIO_HELPER_H_
      6 #define CONTENT_RENDERER_PEPPER_AUDIO_HELPER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/memory/shared_memory.h"
     11 #include "base/sync_socket.h"
     12 #include "ppapi/c/pp_completion_callback.h"
     13 #include "ppapi/shared_impl/resource.h"
     14 #include "ppapi/shared_impl/scoped_pp_resource.h"
     15 #include "ppapi/shared_impl/tracked_callback.h"
     16 
     17 namespace content {
     18 
     19 class AudioHelper {
     20  public:
     21   AudioHelper();
     22   virtual ~AudioHelper();
     23 
     24   // Called when the stream is created.
     25   void StreamCreated(base::SharedMemoryHandle shared_memory_handle,
     26                      size_t shared_memory_size_,
     27                      base::SyncSocket::Handle socket);
     28 
     29   void SetCreateCallback(
     30       scoped_refptr<ppapi::TrackedCallback> create_callback);
     31 
     32  protected:
     33   // TODO(viettrungluu): This is all very poorly thought out. Refactor.
     34 
     35   // To be called by implementations of |PPB_Audio_API|/|PPB_AudioInput_API|.
     36   int32_t GetSyncSocketImpl(int* sync_socket);
     37   int32_t GetSharedMemoryImpl(int* shm_handle, uint32_t* shm_size);
     38 
     39   // To be implemented by subclasses to call their |SetStreamInfo()|.
     40   virtual void OnSetStreamInfo(base::SharedMemoryHandle shared_memory_handle,
     41                                size_t shared_memory_size,
     42                                base::SyncSocket::Handle socket_handle) = 0;
     43 
     44  private:
     45   scoped_refptr<ppapi::TrackedCallback> create_callback_;
     46 
     47   // When a create callback is being issued, these will save the info for
     48   // querying from the callback. The proxy uses this to get the handles to the
     49   // other process instead of mapping them in the renderer. These will be
     50   // invalid all other times.
     51   scoped_ptr<base::SharedMemory> shared_memory_for_create_callback_;
     52   size_t shared_memory_size_for_create_callback_;
     53   scoped_ptr<base::SyncSocket> socket_for_create_callback_;
     54 
     55   DISALLOW_COPY_AND_ASSIGN(AudioHelper);
     56 };
     57 
     58 }  // namespace content
     59 
     60 #endif  // CONTENT_RENDERER_PEPPER_AUDIO_HELPER_H_
     61