content/browser/renderer_host/media/audio_input_sync_writer.h

   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,
  32                        uint32 size,
  33                        double volume,
  34                        bool key_pressed) OVERRIDE;
  35   virtual void Close() OVERRIDE;
  36
  37   bool Init();
  38   bool PrepareForeignSocketHandle(base::ProcessHandle process_handle,
  39 #if defined(OS_WIN)
  40                                   base::SyncSocket::Handle* foreign_handle);
  41 #else
  42                                   base::FileDescriptor* foreign_handle);
  43 #endif
  44
  45  private:
  46   base::SharedMemory* shared_memory_;
  47   uint32 shared_memory_segment_size_;
  48   uint32 shared_memory_segment_count_;
  49   uint32 current_segment_id_;
  50
  51   // Socket for transmitting audio data.
  52   scoped_ptr<base::CancelableSyncSocket> socket_;
  53
  54   // Socket to be used by the renderer. The reference is released after
  55   // PrepareForeignSocketHandle() is called and ran successfully.
  56   scoped_ptr<base::CancelableSyncSocket> foreign_socket_;
  57
  58   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputSyncWriter);
  59 };
  60
  61 }  // namespace content
  62
  63 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_