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 // AudioInputRendererHost serves audio related requests from audio capturer 6 // which lives inside the render process and provide access to audio hardware. 7 // 8 // Create stream sequence (AudioInputController = AIC): 9 // 10 // AudioInputHostMsg_CreateStream -> OnCreateStream -> AIC::CreateLowLatency -> 11 // <- AudioInputMsg_NotifyStreamCreated <- DoCompleteCreation <- OnCreated <- 12 // 13 // Close stream sequence: 14 // 15 // AudioInputHostMsg_CloseStream -> OnCloseStream -> AIC::Close -> 16 // 17 // This class is owned by BrowserRenderProcessHost and instantiated on UI 18 // thread. All other operations and method calls happen on IO thread, so we 19 // need to be extra careful about the lifetime of this object. 20 // 21 // To ensure low latency audio, a SyncSocket pair is used to signal buffer 22 // readiness without having to route messages using the IO thread. 23 24 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_RENDERER_HOST_H_ 25 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_RENDERER_HOST_H_ 26 27 #include <map> 28 #include <string> 29 30 #include "base/compiler_specific.h" 31 #include "base/gtest_prod_util.h" 32 #include "base/memory/ref_counted.h" 33 #include "base/memory/scoped_ptr.h" 34 #include "base/memory/shared_memory.h" 35 #include "base/process/process.h" 36 #include "base/sequenced_task_runner_helpers.h" 37 #include "content/common/media/audio_messages.h" 38 #include "content/public/browser/browser_message_filter.h" 39 #include "content/public/browser/browser_thread.h" 40 #include "media/audio/audio_input_controller.h" 41 #include "media/audio/audio_io.h" 42 #include "media/audio/simple_sources.h" 43 44 namespace media { 45 class AudioManager; 46 class AudioParameters; 47 } 48 49 namespace content { 50 class AudioMirroringManager; 51 class MediaStreamManager; 52 53 class CONTENT_EXPORT AudioInputRendererHost 54 : public BrowserMessageFilter, 55 public media::AudioInputController::EventHandler { 56 public: 57 // Called from UI thread from the owner of this object. 58 AudioInputRendererHost( 59 media::AudioManager* audio_manager, 60 MediaStreamManager* media_stream_manager, 61 AudioMirroringManager* audio_mirroring_manager); 62 63 // BrowserMessageFilter implementation. 64 virtual void OnChannelClosing() OVERRIDE; 65 virtual void OnDestruct() const OVERRIDE; 66 virtual bool OnMessageReceived(const IPC::Message& message, 67 bool* message_was_ok) OVERRIDE; 68 69 // AudioInputController::EventHandler implementation. 70 virtual void OnCreated(media::AudioInputController* controller) OVERRIDE; 71 virtual void OnRecording(media::AudioInputController* controller) OVERRIDE; 72 virtual void OnError(media::AudioInputController* controller) OVERRIDE; 73 virtual void OnData(media::AudioInputController* controller, 74 const uint8* data, 75 uint32 size) OVERRIDE; 76 77 private: 78 // TODO(henrika): extend test suite (compare AudioRenderHost) 79 friend class BrowserThread; 80 friend class base::DeleteHelper<AudioInputRendererHost>; 81 82 struct AudioEntry; 83 typedef std::map<int, AudioEntry*> AudioEntryMap; 84 85 virtual ~AudioInputRendererHost(); 86 87 // Methods called on IO thread ---------------------------------------------- 88 89 // Audio related IPC message handlers. 90 91 // Creates an audio input stream with the specified format whose data is 92 // consumed by an entity in the render view referenced by |render_view_id|. 93 // |session_id| is used to find out which device to be used for the stream. 94 // Upon success/failure, the peer is notified via the 95 // NotifyStreamCreated message. 96 void OnCreateStream(int stream_id, 97 int render_view_id, 98 int session_id, 99 const AudioInputHostMsg_CreateStream_Config& config); 100 101 // Record the audio input stream referenced by |stream_id|. 102 void OnRecordStream(int stream_id); 103 104 // Close the audio stream referenced by |stream_id|. 105 void OnCloseStream(int stream_id); 106 107 // Set the volume of the audio stream referenced by |stream_id|. 108 void OnSetVolume(int stream_id, double volume); 109 110 // Complete the process of creating an audio input stream. This will set up 111 // the shared memory or shared socket in low latency mode and send the 112 // NotifyStreamCreated message to the peer. 113 void DoCompleteCreation(media::AudioInputController* controller); 114 115 // Send a state change message to the renderer. 116 void DoSendRecordingMessage(media::AudioInputController* controller); 117 118 // Handle error coming from audio stream. 119 void DoHandleError(media::AudioInputController* controller); 120 121 // Send an error message to the renderer. 122 void SendErrorMessage(int stream_id); 123 124 // Delete all audio entry and all audio streams 125 void DeleteEntries(); 126 127 // Closes the stream. The stream is then deleted in DeleteEntry() after it 128 // is closed. 129 void CloseAndDeleteStream(AudioEntry* entry); 130 131 // Delete an audio entry and close the related audio stream. 132 void DeleteEntry(AudioEntry* entry); 133 134 // Delete audio entry and close the related audio input stream. 135 void DeleteEntryOnError(AudioEntry* entry); 136 137 // A helper method to look up a AudioEntry identified by |stream_id|. 138 // Returns NULL if not found. 139 AudioEntry* LookupById(int stream_id); 140 141 // Search for a AudioEntry having the reference to |controller|. 142 // This method is used to look up an AudioEntry after a controller 143 // event is received. 144 AudioEntry* LookupByController(media::AudioInputController* controller); 145 146 // Used to create an AudioInputController. 147 media::AudioManager* audio_manager_; 148 149 // Used to access to AudioInputDeviceManager. 150 MediaStreamManager* media_stream_manager_; 151 152 AudioMirroringManager* audio_mirroring_manager_; 153 154 // A map of stream IDs to audio sources. 155 AudioEntryMap audio_entries_; 156 157 DISALLOW_COPY_AND_ASSIGN(AudioInputRendererHost); 158 }; 159 160 } // namespace content 161 162 #endif // CONTENT_BROWSER_RENDERER_HOST_MEDIA_AUDIO_INPUT_RENDERER_HOST_H_ 163
