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 CHROME_BROWSER_MEDIA_AUDIO_STREAM_INDICATOR_H_ 6 #define CHROME_BROWSER_MEDIA_AUDIO_STREAM_INDICATOR_H_ 7 8 #include <map> 9 #include <vector> 10 11 #include "base/memory/ref_counted.h" 12 13 namespace content { 14 class WebContents; 15 } 16 17 class AudioStreamIndicator 18 : public base::RefCountedThreadSafe<AudioStreamIndicator> { 19 public: 20 AudioStreamIndicator(); 21 22 // This method should be called on the IO thread. 23 void UpdateWebContentsStatus(int render_process_id, 24 int render_view_id, 25 int stream_id, 26 bool is_playing, 27 float power_dbfs, 28 bool clipped); 29 30 // This method should be called on the UI thread. 31 bool IsPlayingAudio(const content::WebContents* contents); 32 33 // Returns the audible |level| in the range [0.0,1.0], where 0.0 means the 34 // audio signal is imperceivably silent and 1.0 means it is at maximum 35 // volume. |signal_has_clipped| is set to true if any part of the audio 36 // signal has clipped since the last call to this method. 37 // 38 // This method should be called on the UI thread. 39 void CurrentAudibleLevel(const content::WebContents* contents, 40 float* level, bool* signal_has_clipped); 41 42 private: 43 // <render process ID, render view ID> 44 // Note: Using std::pair<> to reduce binary-size bloat. 45 typedef std::pair<int, int> RenderViewId; 46 struct StreamPowerLevel { 47 int stream_id; 48 float power_dbfs; 49 bool clipped; 50 }; 51 typedef std::vector<StreamPowerLevel> StreamPowerLevels; 52 // Container for the power levels of streams playing from each render view. 53 typedef std::map<RenderViewId, StreamPowerLevels> RenderViewStreamMap; 54 55 friend class base::RefCountedThreadSafe<AudioStreamIndicator>; 56 virtual ~AudioStreamIndicator(); 57 58 void UpdateWebContentsStatusOnUIThread(int render_process_id, 59 int render_view_id, 60 int stream_id, 61 bool is_playing, 62 float power_dbfs, 63 bool clipped); 64 65 RenderViewStreamMap audio_streams_; 66 }; 67 68 #endif // CHROME_BROWSER_MEDIA_AUDIO_STREAM_INDICATOR_H_ 69