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_ 64