gecko-dev/content/media/webaudio/WebAudioUtils.h
Ehsan Akhgari 2824b29025 Bug 895322 - Part 1: Replace the usages of MOZ_STATIC_ASSERT with C++11 static_assert; r=Waldo
This patch was mostly generated by running the following scripts on the codebase, with some
manual changes made afterwards:

# static_assert.sh
#!/bin/bash
# Command to convert an NSPR integer type to the equivalent standard integer type

function convert() {
echo "Converting $1 to $2..."
find . ! -wholename "*nsprpub*" \
       ! -wholename "*security/nss*" \
       ! -wholename "*/.hg*" \
       ! -wholename "obj-ff-dbg*" \
       ! -name nsXPCOMCID.h \
       ! -name prtypes.h \
         -type f \
      \( -iname "*.cpp" \
         -o -iname "*.h" \
         -o -iname "*.cc" \
         -o -iname "*.mm" \) | \
    xargs -n 1 `dirname $0`/assert_replacer.py #sed -i -e "s/\b$1\b/$2/g"
}

convert MOZ_STATIC_ASSERT static_assert
hg rev --no-backup mfbt/Assertions.h \
                   media/webrtc/signaling/src/sipcc/core/includes/ccapi.h \
                   modules/libmar/src/mar_private.h \
                   modules/libmar/src/mar.h


# assert_replacer.py
#!/usr/bin/python

import sys
import re

pattern = re.compile(r"\bMOZ_STATIC_ASSERT\b")

def replaceInPlace(fname):
  print fname
  f = open(fname, "rw+")
  lines = f.readlines()
  for i in range(0, len(lines)):
    while True:
      index = re.search(pattern, lines[i])
      if index != None:
        index = index.start()
        lines[i] = lines[i][0:index] + "static_assert" + lines[i][index+len("MOZ_STATIC_ASSERT"):]
        for j in range(i + 1, len(lines)):
          if lines[j].find("                 ", index) == index:
            lines[j] = lines[j][0:index] + lines[j][index+4:]
          else:
            break
      else:
        break
  f.seek(0, 0)
  f.truncate()
  f.write("".join(lines))
  f.close()

argc = len(sys.argv)
for i in range(1, argc):
  replaceInPlace(sys.argv[i])

--HG--
extra : rebase_source : 4b4a4047d82f2c205b9fad8d56dfc3f1afc0b045
2013-07-18 13:59:53 -04:00

220 lines
6.1 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef WebAudioUtils_h_
#define WebAudioUtils_h_
#include <cmath>
#include <limits>
#include "mozilla/TypeTraits.h"
#include "mozilla/Assertions.h"
#include "AudioParamTimeline.h"
#include "MediaSegment.h"
namespace mozilla {
class AudioNodeStream;
namespace dom {
struct WebAudioUtils {
// This is an arbitrary large number used to protect against OOMs.
// We can adjust it later if needed.
static const uint32_t MaxChannelCount = 32;
static bool FuzzyEqual(float v1, float v2)
{
using namespace std;
return fabsf(v1 - v2) < 1e-7f;
}
static bool FuzzyEqual(double v1, double v2)
{
using namespace std;
return fabs(v1 - v2) < 1e-7;
}
/**
* Computes an exponential smoothing rate for a time based variable
* over aDuration seconds.
*/
static double ComputeSmoothingRate(double aDuration, double aSampleRate)
{
return 1.0 - std::exp(-1.0 / (aDuration * aSampleRate));
}
/**
* Convert a time in second relative to the destination stream to
* TrackTicks relative to the source stream.
*/
static TrackTicks
ConvertDestinationStreamTimeToSourceStreamTime(double aTime,
AudioNodeStream* aSource,
MediaStream* aDestination);
/**
* Converts AudioParamTimeline floating point time values to tick values
* with respect to a source and a destination AudioNodeStream.
*
* This needs to be called for each AudioParamTimeline that gets sent to an
* AudioNodeEngine on the engine side where the AudioParamTimeline is
* received. This means that such engines need to be aware of their source
* and destination streams as well.
*/
static void ConvertAudioParamToTicks(AudioParamTimeline& aParam,
AudioNodeStream* aSource,
AudioNodeStream* aDest);
/**
* Converts a linear value to decibels. Returns aMinDecibels if the linear
* value is 0.
*/
static float ConvertLinearToDecibels(float aLinearValue, float aMinDecibels)
{
return aLinearValue ? 20.0f * std::log10(aLinearValue) : aMinDecibels;
}
/**
* Converts a decibel value to a linear value.
*/
static float ConvertDecibelsToLinear(float aDecibels)
{
return std::pow(10.0f, 0.05f * aDecibels);
}
/**
* Converts a decibel to a linear value.
*/
static float ConvertDecibelToLinear(float aDecibel)
{
return std::pow(10.0f, 0.05f * aDecibel);
}
static void FixNaN(double& aDouble)
{
if (IsNaN(aDouble) || IsInfinite(aDouble)) {
aDouble = 0.0;
}
}
static double DiscreteTimeConstantForSampleRate(double timeConstant, double sampleRate)
{
return 1.0 - std::exp(-1.0 / (sampleRate * timeConstant));
}
static bool IsTimeValid(double aTime)
{
return aTime >= 0 && aTime <= (MEDIA_TIME_MAX >> MEDIA_TIME_FRAC_BITS);
}
/**
* Convert a stream position into the time coordinate of the destination
* stream.
*/
static double StreamPositionToDestinationTime(TrackTicks aSourcePosition,
AudioNodeStream* aSource,
AudioNodeStream* aDestination);
/**
* Converts a floating point value to an integral type in a safe and
* platform agnostic way. The following program demonstrates the kinds
* of ways things can go wrong depending on the CPU architecture you're
* compiling for:
*
* #include <stdio.h>
* volatile float r;
* int main()
* {
* unsigned int q;
* r = 1e100;
* q = r;
* printf("%f %d\n", r, q);
* r = -1e100;
* q = r;
* printf("%f %d\n", r, q);
* r = 1e15;
* q = r;
* printf("%f %x\n", r, q);
* r = 0/0.;
* q = r;
* printf("%f %d\n", r, q);
* }
*
* This program, when compiled for unsigned int, generates the following
* results depending on the architecture:
*
* x86 and x86-64
* ---
* inf 0
* -inf 0
* 999999995904.000000 -727384064 d4a50000
* nan 0
*
* ARM
* ---
* inf -1
* -inf 0
* 999999995904.000000 -1
* nan 0
*
* When compiled for int, this program generates the following results:
*
* x86 and x86-64
* ---
* inf -2147483648
* -inf -2147483648
* 999999995904.000000 -2147483648
* nan -2147483648
*
* ARM
* ---
* inf 2147483647
* -inf -2147483648
* 999999995904.000000 2147483647
* nan 0
*
* Note that the caller is responsible to make sure that the value
* passed to this function is not a NaN. This function will abort if
* it sees a NaN.
*/
template <typename IntType, typename FloatType>
static IntType TruncateFloatToInt(FloatType f)
{
using namespace std;
static_assert(mozilla::IsIntegral<IntType>::value == true,
"IntType must be an integral type");
static_assert(mozilla::IsFloatingPoint<FloatType>::value == true,
"FloatType must be a floating point type");
if (f != f) {
// It is the responsibility of the caller to deal with NaN values.
// If we ever get to this point, we have a serious bug to fix.
NS_RUNTIMEABORT("We should never see a NaN here");
}
if (f > FloatType(numeric_limits<IntType>::max())) {
// If the floating point value is outside of the range of maximum
// integral value for this type, just clamp to the maximum value.
return numeric_limits<IntType>::max();
}
if (f < FloatType(numeric_limits<IntType>::min())) {
// If the floating point value is outside of the range of minimum
// integral value for this type, just clamp to the minimum value.
return numeric_limits<IntType>::min();
}
// Otherwise, this conversion must be well defined.
return IntType(f);
}
};
}
}
#endif