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Qm shift key detection chroma #2137

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Sep 1, 2019
Merged

Qm shift key detection chroma #2137

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d94c702
shift chroma one bin, to have always three bins per note
daschuer Jun 7, 2019
7e94827
fix typo
daschuer Aug 18, 2019
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19 changes: 9 additions & 10 deletions lib/qm-dsp/dsp/keydetection/GetKeyMode.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -76,10 +76,11 @@ GetKeyMode::GetKeyMode(Config config) :

// Set C3 (= MIDI #48) as our base:
// This implies that key = 1 => Cmaj, key = 12 => Bmaj, key = 13 => Cmin, etc.
const float centsOffset = -12.0f / kBinsPerOctave * 100; // 3 bins per note, start with the first
chromaConfig.min =
Pitch::getFrequencyForPitch( 48, 0, config.tuningFrequency );
Pitch::getFrequencyForPitch( 48, centsOffset, config.tuningFrequency );
chromaConfig.max =
Pitch::getFrequencyForPitch( 96, 0, config.tuningFrequency );
Pitch::getFrequencyForPitch( 96, centsOffset, config.tuningFrequency );

chromaConfig.BPO = kBinsPerOctave;
chromaConfig.CQThresh = 0.0054;
Expand Down Expand Up @@ -232,14 +233,11 @@ int GetKeyMode::process(double *pcmData)
}

for (k = 0; k < kBinsPerOctave; k++) {
// The Chromagram has the center of C at bin 0, while the major
// and minor profiles have the center of C at 1. We want to have
// the correlation for C result also at 1.
// To achieve this we have to shift two times:
m_majCorr[k] = krumCorr
(m_meanHPCP, m_majProfileNorm, k - 2, kBinsPerOctave);
m_minCorr[k] = krumCorr
(m_meanHPCP, m_minProfileNorm, k - 2, kBinsPerOctave);
// The cromagram and the major and minor profiles have the has the
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// center of C at bin 1. We want to have the correlation for C result
// also at 1. To achieve this we have to shift by one:
m_majCorr[k] = krumCorr(m_meanHPCP, m_majProfileNorm, (int)k - 1, kBinsPerOctave);
m_minCorr[k] = krumCorr(m_meanHPCP, m_minProfileNorm, (int)k - 1, kBinsPerOctave);
}

// m_MajCorr[1] is C center 1 / 3 + 1 = 1
Expand Down Expand Up @@ -314,3 +312,4 @@ double* GetKeyMode::getKeyStrengths() {

return m_keyStrengths;
}

44 changes: 44 additions & 0 deletions lib/qm-dsp/mixxx-changes.patch
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Expand Up @@ -64,3 +64,47 @@ index 72e5a57..81d8a8e 100644
extern "C" {
#endif

diff --git a/lib/qm-dsp/dsp/keydetection/GetKeyMode.cpp b/lib/qm-dsp/dsp/keydetection/GetKeyMode.cpp
index 879f8a8..7d62253 100644
--- a/lib/qm-dsp/dsp/keydetection/GetKeyMode.cpp
+++ b/lib/qm-dsp/dsp/keydetection/GetKeyMode.cpp
@@ -76,10 +76,11 @@ GetKeyMode::GetKeyMode(Config config) :

// Set C3 (= MIDI #48) as our base:
// This implies that key = 1 => Cmaj, key = 12 => Bmaj, key = 13 => Cmin, etc.
+ const float centsOffset = -12.0f / kBinsPerOctave * 100; // 3 bins per note, start with the first
chromaConfig.min =
- Pitch::getFrequencyForPitch( 48, 0, config.tuningFrequency );
+ Pitch::getFrequencyForPitch( 48, centsOffset, config.tuningFrequency );
chromaConfig.max =
- Pitch::getFrequencyForPitch( 96, 0, config.tuningFrequency );
+ Pitch::getFrequencyForPitch( 96, centsOffset, config.tuningFrequency );

chromaConfig.BPO = kBinsPerOctave;
chromaConfig.CQThresh = 0.0054;
@@ -232,14 +233,11 @@ int GetKeyMode::process(double *pcmData)
}

for (k = 0; k < kBinsPerOctave; k++) {
- // The Chromagram has the center of C at bin 0, while the major
- // and minor profiles have the center of C at 1. We want to have
- // the correlation for C result also at 1.
- // To achieve this we have to shift two times:
- m_majCorr[k] = krumCorr
- (m_meanHPCP, m_majProfileNorm, k - 2, kBinsPerOctave);
- m_minCorr[k] = krumCorr
- (m_meanHPCP, m_minProfileNorm, k - 2, kBinsPerOctave);
+ // The cromagram and the major and minor profiles have the has the
+ // center of C at bin 1. We want to have the correlation for C result
+ // also at 1. To achieve this we have to shift by one:
+ m_majCorr[k] = krumCorr(m_meanHPCP, m_majProfileNorm, (int)k - 1, kBinsPerOctave);
+ m_minCorr[k] = krumCorr(m_meanHPCP, m_minProfileNorm, (int)k - 1, kBinsPerOctave);
}

// m_MajCorr[1] is C center 1 / 3 + 1 = 1
@@ -314,3 +312,4 @@ double* GetKeyMode::getKeyStrengths() {

return m_keyStrengths;
}
+