src/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/memory/scoped_vector.h"
   9 #include "base/process/process.h"
  10 #include "base/sync_socket.h"
  11 #include "base/time/time.h"
  12 #include "media/audio/audio_input_controller.h"
  13 #include "media/audio/audio_parameters.h"
  14 #include "media/base/audio_bus.h"
  15
  16 #if defined(OS_POSIX)
  17 #include "base/file_descriptor_posix.h"
  18 #endif
  19
  20 namespace base {
  21 class SharedMemory;
  22 }
  23
  24 namespace content {
  25 // A AudioInputController::SyncWriter implementation using SyncSocket. This
  26 // is used by AudioInputController to provide a low latency data source for
  27 // transmitting audio packets between the browser process and the renderer
  28 // process.
  29 class AudioInputSyncWriter : public media::AudioInputController::SyncWriter {
  30  public:
  31   explicit AudioInputSyncWriter(base::SharedMemory* shared_memory,
  32                                 int shared_memory_segment_count,
  33                                 const media::AudioParameters& params);
  34
  35   virtual ~AudioInputSyncWriter();
  36
  37   // media::AudioInputController::SyncWriter implementation.
  38   virtual void UpdateRecordedBytes(uint32 bytes) OVERRIDE;
  39   virtual void Write(const media::AudioBus* data,
  40                      double volume,
  41                      bool key_pressed) OVERRIDE;
  42   virtual void Close() OVERRIDE;
  43
  44   bool Init();
  45   bool PrepareForeignSocket(base::ProcessHandle process_handle,
  46                             base::SyncSocket::TransitDescriptor* descriptor);
  47
  48  private:
  49   base::SharedMemory* shared_memory_;
  50   uint32 shared_memory_segment_size_;
  51   uint32 shared_memory_segment_count_;
  52   uint32 current_segment_id_;
  53
  54   // Socket for transmitting audio data.
  55   scoped_ptr<base::CancelableSyncSocket> socket_;
  56
  57   // Socket to be used by the renderer. The reference is released after
  58   // PrepareForeignSocketHandle() is called and ran successfully.
  59   scoped_ptr<base::CancelableSyncSocket> foreign_socket_;
  60
  61   // The time of the creation of this object.
  62   base::Time creation_time_;
  63
  64   // The time of the last Write call.
  65   base::Time last_write_time_;
  66
  67   // Size in bytes of each audio bus.
  68   const int audio_bus_memory_size_;
  69
  70   // Vector of audio buses allocated during construction and deleted in the
  71   // destructor.
  72   ScopedVector<media::AudioBus> audio_buses_;
  73
  74   DISALLOW_IMPLICIT_CONSTRUCTORS(AudioInputSyncWriter);
  75 };
  76
  77 }  // namespace content
  78
  79 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_SYNC_WRITER_H_