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Added method AudioData::Pointer::findMinAndMax

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This commit is contained in:
jules 2013-02-18 16:47:15 +00:00
parent f5175b3c2d
commit a802f5d081
1 changed files with 50 additions and 2 deletions
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52
modules/juce_audio_basics/buffers/juce_AudioDataConverters.h
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@ -422,8 +422,7 @@ public:
{
static_jassert (Constness::isConst == 0); // trying to write to a const pointer! For a writeable one, use AudioData::NonConst instead!
Pointer dest (*this);
while (--numSamples >= 0)
for (Pointer dest (*this); --numSamples >= 0;)
{
dest.data.copyFromSameType (source.data);
dest.advance();
@ -467,6 +466,55 @@ public:
dest.clear (dest.data, numSamples);
}
/** Scans a block of data, returning the lowest and highest levels as floats */
void findMinAndMax (size_t numSamples, float& minValue, float& maxValue) const noexcept
{
if (numSamples == 0)
{
minValue = maxValue = 0;
return;
}
Pointer dest (*this);
if (isFloatingPoint())
{
float mn = dest.getAsFloat();
dest.advance();
float mx = mn;
while (--numSamples > 0)
{
const float v = dest.getAsFloat();
dest.advance();
if (mx < v) mx = v;
if (v < mn) mn = v;
}
minValue = mn;
maxValue = mx;
}
else
{
int32 mn = dest.getAsInt32();
dest.advance();
int32 mx = mn;
while (--numSamples > 0)
{
const int v = dest.getAsInt32();
dest.advance();
if (mx < v) mx = v;
if (v < mn) mn = v;
}
minValue = mn * (float) (1.0 / (1.0 + Int32::maxValue));
maxValue = mx * (float) (1.0 / (1.0 + Int32::maxValue));
}
}
/** Returns true if the pointer is using a floating-point format. */
static bool isFloatingPoint() noexcept { return (bool) SampleFormat::isFloat; }