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/process/process.h"
   9 #include "base/sync_socket.h"
  10 #include "base/time/time.h"
  11 #include "media/audio/audio_input_controller.h"
  12
  13 #if defined(OS_POSIX)
  14 #include "base/file_descriptor_posix.h"
  15 #endif
  16
  17 namespace base {
  18 class SharedMemory;
  19 }
  20
  21 namespace content {
  22 // A AudioInputController::SyncWriter implementation using SyncSocket. This
  23 // is used by AudioInputController to provide a low latency data source for
  24 // transmitting audio packets between the browser process and the renderer
  25 // process.
  26 class AudioInputSyncWriter : public media::AudioInputController::SyncWriter {
  27  public:
  28   explicit AudioInputSyncWriter(base::SharedMemory* shared_memory,
  29                                 int shared_memory_segment_count);
  30
  31   virtual ~AudioInputSyncWriter();
  32
  33   // media::AudioOutputController::SyncWriter implementation.
  34   virtual void UpdateRecordedBytes(uint32 bytes) OVERRIDE;
  35   virtual uint32 Write(const void* data,
  36                        uint32 size,
  37                        double volume,
  38                        bool key_pressed) OVERRIDE;
  39   virtual void Close() OVERRIDE;
  40
  41   bool Init();
  42   bool PrepareForeignSocketHandle(base::ProcessHandle process_handle,
  43 #if defined(OS_WIN)
  44                                   base::SyncSocket::Handle* foreign_handle);
  45 #else
  46                                   base::FileDescriptor* foreign_handle);
  47 #endif
  48
  49  private:
  50   base::SharedMemory* shared_memory_;
  51   uint32 shared_memory_segment_size_;
  52   uint32 shared_memory_segment_count_;
  53   uint32 current_segment_id_;
  54
  55   // Socket for transmitting audio data.
  56   scoped_ptr<base::CancelableSyncSocket> socket_;
  57
  58   // Socket to be used by the renderer. The reference is released after
  59   // PrepareForeignSocketHandle() is called and ran successfully.
  60   scoped_ptr<base::CancelableSyncSocket> foreign_socket_;
  61
  62   // The time of the creation of this object.
  63   base::Time creation_time_;
  64
  65   // The time of the last Write call.
  66   base::Time last_write_time_;
  67
  68   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputSyncWriter);
  69 };
  70
  71 }  // namespace content
  72
  73 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_