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https://github.com/cookiengineer/audacity
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50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
/* comp_chroma.cpp -- compute chroma distance
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*
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* 2008 RBD
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*/
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#include <string.h>
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#include <math.h>
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#include <fstream>
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#include <algorithm>
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#include "allegro.h"
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#include "audioreader.h"
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#include "scorealign.h"
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#include "gen_chroma.h"
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#include "comp_chroma.h"
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using namespace std;
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#ifdef min
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#undef min
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#endif
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#define min(x,y) ((x)<(y)?(x):(y))
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#define SILENCE_DISTANCE 16.0
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/* GEN_DIST
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*
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* This function generates the Euclidean distance for points i
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* and j in two chroma vectors for use with dynamic time warping of
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* the chroma vectors.
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*/
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float Scorealign::gen_dist(int i, int j)
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{
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const float MAX = 12.0;
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assert(i < file0_frames);
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assert(j < file1_frames);
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float *cv0 = AREF1(chrom_energy0, i);
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float *cv1 = AREF1(chrom_energy1, j);
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if (cv0[CHROMA_BIN_COUNT] != cv1[CHROMA_BIN_COUNT]) {
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// silent frames are a (large) constant distance from non-silent frames
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return SILENCE_DISTANCE;
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}
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/* calculate the Euclidean distance between these vectors */
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float sum = 0;
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for (int k = 0; k < CHROMA_BIN_COUNT; k++) {
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float diff = cv0[k] - cv1[k];
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sum += diff * diff ;
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}
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// place a ceiling (MAX) on distance
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return min(sqrt(sum), MAX);
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}
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