From 35c392463ec853fa0420fc9faeaf66abf76ecdd1 Mon Sep 17 00:00:00 2001
From: Karl Tomlinson <karlt+@karlt.net>
Date: Thu, 10 Aug 2023 11:18:39 +0000
Subject: [PATCH] Bug 1358149 switch inexact cmath function usage in Web Audio
 to math.h r=padenot

This will facilitate switching these functions to fdlibm, which maps to math.h.

Depends on D185781

Differential Revision: https://phabricator.services.mozilla.com/D185782
---
 dom/media/webaudio/BiquadFilterNode.cpp | 2 +-
 dom/media/webaudio/WebAudioUtils.h      | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/dom/media/webaudio/BiquadFilterNode.cpp b/dom/media/webaudio/BiquadFilterNode.cpp
index 772043a5f21e8..a950f85823946 100644
--- a/dom/media/webaudio/BiquadFilterNode.cpp
+++ b/dom/media/webaudio/BiquadFilterNode.cpp
@@ -35,7 +35,7 @@ static void SetParamsOnBiquad(WebCore::Biquad& aBiquad, float aSampleRate,
   double normalizedFrequency = aFrequency / nyquist;
 
   if (aDetune) {
-    normalizedFrequency *= std::exp2(aDetune / 1200);
+    normalizedFrequency *= exp2(aDetune / 1200);
   }
 
   switch (aType) {
diff --git a/dom/media/webaudio/WebAudioUtils.h b/dom/media/webaudio/WebAudioUtils.h
index 0b01efde69cac..c27b51787a50f 100644
--- a/dom/media/webaudio/WebAudioUtils.h
+++ b/dom/media/webaudio/WebAudioUtils.h
@@ -59,21 +59,21 @@ void ConvertAudioTimelineEventToTicks(AudioTimelineEvent& aEvent,
  * value is 0.
  */
 inline float ConvertLinearToDecibels(float aLinearValue, float aMinDecibels) {
-  return aLinearValue ? 20.0f * std::log10(aLinearValue) : aMinDecibels;
+  return aLinearValue ? 20.0f * log10f(aLinearValue) : aMinDecibels;
 }
 
 /**
  * Converts a decibel value to a linear value.
  */
 inline float ConvertDecibelsToLinear(float aDecibels) {
-  return std::pow(10.0f, 0.05f * aDecibels);
+  return powf(10.0f, 0.05f * aDecibels);
 }
 
 /**
  * Converts a decibel to a linear value.
  */
 inline float ConvertDecibelToLinear(float aDecibel) {
-  return std::pow(10.0f, 0.05f * aDecibel);
+  return powf(10.0f, 0.05f * aDecibel);
 }
 
 inline void FixNaN(double& aDouble) {
@@ -84,7 +84,7 @@ inline void FixNaN(double& aDouble) {
 
 inline double DiscreteTimeConstantForSampleRate(double timeConstant,
                                                 double sampleRate) {
-  return 1.0 - std::exp(-1.0 / (sampleRate * timeConstant));
+  return 1.0 - exp(-1.0 / (sampleRate * timeConstant));
 }
 
 inline bool IsTimeValid(double aTime) {