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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_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_
      6 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_
      7 
      8 #include "base/file_descriptor_posix.h"
      9 #include "base/process/process.h"
     10 #include "base/sync_socket.h"
     11 #include "media/audio/audio_input_controller.h"
     12 
     13 namespace base {
     14 class SharedMemory;
     15 }
     16 
     17 namespace content {
     18 // A AudioInputController::SyncWriter implementation using SyncSocket. This
     19 // is used by AudioInputController to provide a low latency data source for
     20 // transmitting audio packets between the browser process and the renderer
     21 // process.
     22 class AudioInputSyncWriter : public media::AudioInputController::SyncWriter {
     23  public:
     24   explicit AudioInputSyncWriter(base::SharedMemory* shared_memory,
     25                                 int shared_memory_segment_count);
     26 
     27   virtual ~AudioInputSyncWriter();
     28 
     29   // media::AudioOutputController::SyncWriter implementation.
     30   virtual void UpdateRecordedBytes(uint32 bytes) OVERRIDE;
     31   virtual uint32 Write(const void* data, uint32 size, double volume) OVERRIDE;
     32   virtual void Close() OVERRIDE;
     33 
     34   bool Init();
     35   bool PrepareForeignSocketHandle(base::ProcessHandle process_handle,
     36 #if defined(OS_WIN)
     37                                   base::SyncSocket::Handle* foreign_handle);
     38 #else
     39                                   base::FileDescriptor* foreign_handle);
     40 #endif
     41 
     42  private:
     43   base::SharedMemory* shared_memory_;
     44   uint32 shared_memory_segment_size_;
     45   uint32 shared_memory_segment_count_;
     46   uint32 current_segment_id_;
     47 
     48   // Socket for transmitting audio data.
     49   scoped_ptr<base::CancelableSyncSocket> socket_;
     50 
     51   // Socket to be used by the renderer. The reference is released after
     52   // PrepareForeignSocketHandle() is called and ran successfully.
     53   scoped_ptr<base::CancelableSyncSocket> foreign_socket_;
     54 
     55   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputSyncWriter);
     56 };
     57 
     58 }  // namespace content
     59 
     60 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_
     61