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