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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_PEPPER_PLATFORM_AUDIO_OUTPUT_IMPL_H_
      6 #define CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_IMPL_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/memory/ref_counted.h"
     10 #include "base/memory/scoped_ptr.h"
     11 #include "media/audio/audio_output_ipc.h"
     12 
     13 namespace media {
     14 class AudioParameters;
     15 }
     16 
     17 namespace base {
     18 class MessageLoopProxy;
     19 }
     20 
     21 namespace content {
     22 class AudioHelper;
     23 
     24 class PepperPlatformAudioOutput
     25     : public media::AudioOutputIPCDelegate,
     26       public base::RefCountedThreadSafe<PepperPlatformAudioOutput> {
     27  public:
     28   // Factory function, returns NULL on failure. StreamCreated() will be called
     29   // when the stream is created.
     30   static PepperPlatformAudioOutput* Create(int sample_rate,
     31                                            int frames_per_buffer,
     32                                            int source_render_view_id,
     33                                            int source_render_frame_id,
     34                                            AudioHelper* client);
     35 
     36   // The following three methods are all called on main thread.
     37 
     38   // Starts the playback. Returns false on error or if called before the
     39   // stream is created or after the stream is closed.
     40   bool StartPlayback();
     41 
     42   // Stops the playback. Returns false on error or if called before the stream
     43   // is created or after the stream is closed.
     44   bool StopPlayback();
     45 
     46   // Closes the stream. Make sure to call this before the object is
     47   // destructed.
     48   void ShutDown();
     49 
     50   // media::AudioOutputIPCDelegate implementation.
     51   virtual void OnStateChanged(media::AudioOutputIPCDelegate::State state)
     52       OVERRIDE;
     53   virtual void OnStreamCreated(base::SharedMemoryHandle handle,
     54                                base::SyncSocket::Handle socket_handle,
     55                                int length) OVERRIDE;
     56   virtual void OnIPCClosed() OVERRIDE;
     57 
     58  protected:
     59   virtual ~PepperPlatformAudioOutput();
     60 
     61  private:
     62   friend class base::RefCountedThreadSafe<PepperPlatformAudioOutput>;
     63 
     64   PepperPlatformAudioOutput();
     65 
     66   bool Initialize(int sample_rate,
     67                   int frames_per_buffer,
     68                   int source_render_view_id,
     69                   int source_render_frame_id,
     70                   AudioHelper* client);
     71 
     72   // I/O thread backends to above functions.
     73   void InitializeOnIOThread(const media::AudioParameters& params);
     74   void StartPlaybackOnIOThread();
     75   void StopPlaybackOnIOThread();
     76   void ShutDownOnIOThread();
     77 
     78   // The client to notify when the stream is created. THIS MUST ONLY BE
     79   // ACCESSED ON THE MAIN THREAD.
     80   AudioHelper* client_;
     81 
     82   // Used to send/receive IPC. THIS MUST ONLY BE ACCESSED ON THE
     83   // I/O thread except to send messages and get the message loop.
     84   scoped_ptr<media::AudioOutputIPC> ipc_;
     85 
     86   scoped_refptr<base::MessageLoopProxy> main_message_loop_proxy_;
     87   scoped_refptr<base::MessageLoopProxy> io_message_loop_proxy_;
     88 
     89   DISALLOW_COPY_AND_ASSIGN(PepperPlatformAudioOutput);
     90 };
     91 
     92 }  // namespace content
     93 
     94 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_PLATFORM_AUDIO_OUTPUT_IMPL_H_
     95