1 // Copyright (c) 2013 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 // An AudioInputStream which provides a loop-back of all audio output generated 6 // by the entire RenderFrame tree associated with a WebContents instance. The 7 // single stream of data is produced by format-converting and mixing all audio 8 // output streams. As the RenderFrameHost tree mutates (e.g., due to page 9 // navigations, or crashes/reloads), the stream will continue without 10 // interruption. In other words, WebContentsAudioInputStream provides tab-level 11 // audio mirroring. 12 13 #ifndef CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_INPUT_STREAM_H_ 14 #define CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_INPUT_STREAM_H_ 15 16 #include <string> 17 18 #include "base/memory/ref_counted.h" 19 #include "content/common/content_export.h" 20 #include "media/audio/audio_io.h" 21 22 namespace base { 23 class SingleThreadTaskRunner; 24 } 25 26 namespace media { 27 class AudioParameters; 28 class VirtualAudioInputStream; 29 } 30 31 namespace content { 32 33 class AudioMirroringManager; 34 class WebContentsTracker; 35 36 class CONTENT_EXPORT WebContentsAudioInputStream 37 : NON_EXPORTED_BASE(public media::AudioInputStream) { 38 public: 39 // media::AudioInputStream implementation 40 virtual bool Open() OVERRIDE; 41 virtual void Start(AudioInputCallback* callback) OVERRIDE; 42 virtual void Stop() OVERRIDE; 43 virtual void Close() OVERRIDE; 44 virtual double GetMaxVolume() OVERRIDE; 45 virtual void SetVolume(double volume) OVERRIDE; 46 virtual double GetVolume() OVERRIDE; 47 virtual void SetAutomaticGainControl(bool enabled) OVERRIDE; 48 virtual bool GetAutomaticGainControl() OVERRIDE; 49 virtual bool IsMuted() OVERRIDE; 50 51 // Create a new audio mirroring session, or return NULL on error. |device_id| 52 // should be in the format accepted by 53 // WebContentsCaptureUtil::ExtractTabCaptureTarget(). The caller must 54 // guarantee Close() is called on the returned object so that it may 55 // self-destruct. 56 // |worker_task_runner| is the task runner on which AudioInputCallback methods 57 // are called and may or may not be the single thread that invokes the 58 // AudioInputStream methods. 59 static WebContentsAudioInputStream* Create( 60 const std::string& device_id, 61 const media::AudioParameters& params, 62 const scoped_refptr<base::SingleThreadTaskRunner>& worker_task_runner, 63 AudioMirroringManager* audio_mirroring_manager); 64 65 private: 66 friend class WebContentsAudioInputStreamTest; 67 68 // Maintain most state and functionality in an internal ref-counted 69 // implementation class. This object must outlive a call to Close(), until 70 // the shutdown tasks running on other threads complete: The 71 // AudioMirroringManager on the IO thread, the WebContentsTracker on the UI 72 // thread, and the VirtualAudioOuputStreams on the audio thread. 73 class Impl; 74 75 WebContentsAudioInputStream( 76 int render_process_id, int main_render_frame_id, 77 AudioMirroringManager* mirroring_manager, 78 const scoped_refptr<WebContentsTracker>& tracker, 79 media::VirtualAudioInputStream* mixer_stream); 80 81 virtual ~WebContentsAudioInputStream(); 82 83 scoped_refptr<Impl> impl_; 84 85 DISALLOW_COPY_AND_ASSIGN(WebContentsAudioInputStream); 86 }; 87 88 } // namespace content 89 90 #endif // CONTENT_BROWSER_MEDIA_CAPTURE_WEB_CONTENTS_AUDIO_INPUT_STREAM_H_ 91
