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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 PPAPI_PROXY_PPB_AUDIO_PROXY_H_
      6 #define PPAPI_PROXY_PPB_AUDIO_PROXY_H_
      7 
      8 #include <utility>
      9 
     10 #include "base/basictypes.h"
     11 #include "base/memory/shared_memory.h"
     12 #include "base/sync_socket.h"
     13 #include "ipc/ipc_platform_file.h"
     14 #include "ppapi/c/pp_instance.h"
     15 #include "ppapi/c/pp_resource.h"
     16 #include "ppapi/c/ppb_audio.h"
     17 #include "ppapi/c/ppb_audio_config.h"
     18 #include "ppapi/proxy/interface_proxy.h"
     19 #include "ppapi/proxy/proxy_completion_callback_factory.h"
     20 #include "ppapi/utility/completion_callback_factory.h"
     21 
     22 namespace ppapi {
     23 
     24 class AudioCallbackCombined;
     25 class HostResource;
     26 
     27 namespace proxy {
     28 
     29 class SerializedHandle;
     30 
     31 class PPB_Audio_Proxy : public InterfaceProxy {
     32  public:
     33   PPB_Audio_Proxy(Dispatcher* dispatcher);
     34   virtual ~PPB_Audio_Proxy();
     35 
     36   // Creates an Audio object in the plugin process.
     37   static PP_Resource CreateProxyResource(
     38       PP_Instance instance_id,
     39       PP_Resource config_id,
     40       const AudioCallbackCombined& audio_callback,
     41       void* user_data);
     42 
     43   // InterfaceProxy implementation.
     44   virtual bool OnMessageReceived(const IPC::Message& msg);
     45 
     46   static const ApiID kApiID = API_ID_PPB_AUDIO;
     47 
     48  private:
     49   // Plugin->renderer message handlers.
     50   void OnMsgCreate(PP_Instance instance_id,
     51                    int32_t sample_rate,
     52                    uint32_t sample_frame_count,
     53                    ppapi::HostResource* result);
     54   void OnMsgStartOrStop(const ppapi::HostResource& audio_id, bool play);
     55 
     56   // Renderer->plugin message handlers.
     57   void OnMsgNotifyAudioStreamCreated(
     58       const ppapi::HostResource& audio_id,
     59       int32_t result_code,
     60       ppapi::proxy::SerializedHandle socket_handle,
     61       ppapi::proxy::SerializedHandle handle);
     62 
     63   void AudioChannelConnected(int32_t result,
     64                              const ppapi::HostResource& resource);
     65 
     66   // In the renderer, this is called in response to a stream created message.
     67   // It will retrieve the shared memory and socket handles and place them into
     68   // the given out params. The return value is a PPAPI error code.
     69   //
     70   // The input arguments should be initialized to 0 or -1, depending on the
     71   // platform's default invalid handle values. On error, some of these
     72   // arguments may be written to, and others may be untouched, depending on
     73   // where the error occurred.
     74   int32_t GetAudioConnectedHandles(
     75       const ppapi::HostResource& resource,
     76       IPC::PlatformFileForTransit* foreign_socket_handle,
     77       base::SharedMemoryHandle* foreign_shared_memory_handle,
     78       uint32_t* shared_memory_length);
     79 
     80   ProxyCompletionCallbackFactory<PPB_Audio_Proxy> callback_factory_;
     81 
     82   DISALLOW_COPY_AND_ASSIGN(PPB_Audio_Proxy);
     83 };
     84 
     85 }  // namespace proxy
     86 }  // namespace ppapi
     87 
     88 #endif  // PPAPI_PROXY_PPB_AUDIO_PROXY_H_
     89