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use a trailing average for a quieter loudness

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Stephen Birarda 2014-03-21 15:53:00 -07:00
parent dc2d050187
commit bad209bf09
1 changed files with 9 additions and 1 deletions
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10
libraries/audio/src/AudioRingBuffer.cpp
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@ -67,7 +67,15 @@ void AudioRingBuffer::updateAverageLoudnessForBoundarySamples(int numSamples) {
nextLoudness /= numSamples;
nextLoudness /= MAX_SAMPLE_VALUE;
_averageLoudness = nextLoudness;
const int TRAILING_AVERAGE_FRAMES = 100;
const float CURRENT_FRAME_RATIO = 1 / TRAILING_AVERAGE_FRAMES;
const float PREVIOUS_FRAMES_RATIO = 1 - CURRENT_FRAME_RATIO;
if (nextLoudness >= _averageLoudness) {
_averageLoudness = nextLoudness;
} else {
_averageLoudness = (_averageLoudness * PREVIOUS_FRAMES_RATIO) + (CURRENT_FRAME_RATIO * nextLoudness);
}
}
qint64 AudioRingBuffer::readSamples(int16_t* destination, qint64 maxSamples) {