Removing "using" declarations that import names in the C++ Standard library.(Source/platform/audio)

Source/platform/audio/EqualPowerPanner.cpp

 /*
  * Copyright (C) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 18 matching lines @@
 #include "platform/audio/EqualPowerPanner.h"
 
 #include <algorithm>
 #include "platform/audio/AudioBus.h"
 #include "platform/audio/AudioUtilities.h"
 #include "wtf/MathExtras.h"
 
 // Use a 50ms smoothing / de-zippering time-constant.
 const float SmoothingTimeConstant = 0.050f;
 
-using namespace std;
-
 namespace blink {
 
 EqualPowerPanner::EqualPowerPanner(float sampleRate)
     : Panner(PanningModelEqualPower)
     , m_isFirstRender(true)
     , m_gainL(0.0)
     , m_gainR(0.0)
 {
     m_smoothingConstant = AudioUtilities::discreteTimeConstantForSampleRate(SmoothingTimeConstant, sampleRate);
 }
@@ skipping 14 matching lines @@
 
     const float* sourceL = inputBus->channel(0)->data();
     const float* sourceR = numberOfInputChannels > 1 ? inputBus->channel(1)->data() : sourceL;
     float* destinationL = outputBus->channelByType(AudioBus::ChannelLeft)->mutableData();
     float* destinationR = outputBus->channelByType(AudioBus::ChannelRight)->mutableData();
 
     if (!sourceL || !sourceR || !destinationL || !destinationR)
         return;
 
     // Clamp azimuth to allowed range of -180 -> +180.
-    azimuth = max(-180.0, azimuth);
-    azimuth = min(180.0, azimuth);
+    azimuth = std::max(-180.0, azimuth);
+    azimuth = std::min(180.0, azimuth);
 
     // Alias the azimuth ranges behind us to in front of us:
     // -90 -> -180 to -90 -> 0 and 90 -> 180 to 90 -> 0
     if (azimuth < -90)
         azimuth = -180 - azimuth;
     else if (azimuth > 90)
         azimuth = 180 - azimuth;
 
     double desiredPanPosition;
     double desiredGainL;
     double desiredGainR;
 
     if (numberOfInputChannels == 1) { // For mono source case.
         // Pan smoothly from left to right with azimuth going from -90 -> +90 degrees.
         desiredPanPosition = (azimuth + 90) / 180;
     } else { // For stereo source case.
         if (azimuth <= 0) { // from -90 -> 0
             // sourceL -> destL and "equal-power pan" sourceR as in mono case
             // by transforming the "azimuth" value from -90 -> 0 degrees into the range -90 -> +90.
             desiredPanPosition = (azimuth + 90) / 90;
         } else { // from 0 -> +90
             // sourceR -> destR and "equal-power pan" sourceL as in mono case
             // by transforming the "azimuth" value from 0 -> +90 degrees into the range -90 -> +90.
             desiredPanPosition = azimuth / 90;
         }
     }
 
-    desiredGainL = cos(piOverTwoDouble * desiredPanPosition);
-    desiredGainR = sin(piOverTwoDouble * desiredPanPosition);
+    desiredGainL = std::cos(piOverTwoDouble * desiredPanPosition);
+    desiredGainR = std::sin(piOverTwoDouble * desiredPanPosition);
 
     // Don't de-zipper on first render call.
     if (m_isFirstRender) {
         m_isFirstRender = false;
         m_gainL = desiredGainL;
         m_gainR = desiredGainR;
     }
 
     // Cache in local variables.
     double gainL = m_gainL;
@@ skipping 34 matching lines @@
         }
     }
 
     m_gainL = gainL;
     m_gainR = gainR;
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)