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Merge pull request #2429 from birarda/audio-scaling

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use epsilon value to drop average loudness to zero
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Philip Rosedale 2014-03-21 11:30:36 -07:00
commit 6e41d93e0a
1 changed files with 5 additions and 0 deletions
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5
libraries/audio/src/AudioRingBuffer.cpp
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@ -70,8 +70,13 @@ void AudioRingBuffer::updateAverageLoudnessForBoundarySamples(int numSamples) {
const int TRAILING_AVERAGE_FRAMES = 100; const int TRAILING_AVERAGE_FRAMES = 100;
const float CURRENT_FRAME_RATIO = 1.0f / TRAILING_AVERAGE_FRAMES; const float CURRENT_FRAME_RATIO = 1.0f / TRAILING_AVERAGE_FRAMES;
const float PREVIOUS_FRAMES_RATIO = 1 - CURRENT_FRAME_RATIO; const float PREVIOUS_FRAMES_RATIO = 1 - CURRENT_FRAME_RATIO;
const float LOUDNESS_EPSILON = 0.05;
_averageLoudness = (_averageLoudness * PREVIOUS_FRAMES_RATIO) + (CURRENT_FRAME_RATIO * nextLoudness); _averageLoudness = (_averageLoudness * PREVIOUS_FRAMES_RATIO) + (CURRENT_FRAME_RATIO * nextLoudness);
if (_averageLoudness < LOUDNESS_EPSILON) {
_averageLoudness = 0;
}
} }
qint64 AudioRingBuffer::readSamples(int16_t* destination, qint64 maxSamples) { qint64 AudioRingBuffer::readSamples(int16_t* destination, qint64 maxSamples) {