jamie@141: /*
jamie@141:  * Copyright (C) 2012 Jamie Bullock
jamie@140:  *
jamie@141:  * Permission is hereby granted, free of charge, to any person obtaining a copy
jamie@141:  * of this software and associated documentation files (the "Software"), to
jamie@141:  * deal in the Software without restriction, including without limitation the
jamie@141:  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
jamie@141:  * sell copies of the Software, and to permit persons to whom the Software is
jamie@141:  * furnished to do so, subject to the following conditions:
jamie@1:  *
jamie@141:  * The above copyright notice and this permission notice shall be included in
jamie@141:  * all copies or substantial portions of the Software.
jamie@1:  *
jamie@141:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
jamie@141:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
jamie@141:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
jamie@141:  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
jamie@141:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
jamie@141:  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
jamie@141:  * IN THE SOFTWARE.
jamie@1:  *
jamie@1:  */
jamie@1: 
jamie@107: /* scalar.c: defines functions that extract a feature as a single value from an input vector */
jamie@1: 
jamie@113: #include <config.h>
jamie@113: 
jamie@5: #include <stdlib.h>
jamie@43: #include <string.h>
jamie@78: #include <stdio.h>
jamie@113: #include <math.h>
jamie@113: 
jamie@113: #include "xtract/libxtract.h"
jamie@113: #include "xtract/xtract_helper.h"
jamie@113: #include "xtract_macros_private.h"
jamie@1: 
jamie@85: #ifndef powf
jamie@140: #define powf pow
jamie@85: #endif
jamie@85: 
jamie@85: #ifndef expf
jamie@140: #define expf exp
jamie@85: #endif
jamie@85: 
jamie@113: #ifndef sqrtf
jamie@140: #define sqrtf sqrt
jamie@113: #endif
jamie@113: 
jamie@113: #ifndef fabsf
jamie@140: #define fabsf fabs
jamie@113: #endif
jamie@113: 
jamie@113: 
jamie@140: void test(void)
jamie@140: {
jamie@113:     printf("Hello world\n");
jamie@113: #ifdef WORDS_BIGENDIAN
jamie@113:     printf("Big endian!\n");
jamie@113: #endif
jamie@88: }
jamie@88: 
jamie@140: int xtract_mean(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@1:     int n = N;
jamie@1: 
jamie@122:     *result = 0.f;
jamie@113: 
jamie@1:     while(n--)
jamie@140:         *result += data[n];
jamie@140: 
jamie@140:     *result /= N;
jamie@140: 
jamie@140:     return XTRACT_SUCCESS;
jamie@140: }
jamie@140: 
jamie@140: int xtract_variance(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@140: 
jamie@140:     int n = N;
jamie@140: 
jamie@140:     *result = 0.f;
jamie@140: 
jamie@140:     while(n--)
jamie@140:         *result += powf(data[n] - *(float *)argv, 2);
jamie@25: 
jamie@43:     *result = *result / (N - 1);
jamie@44: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_standard_deviation(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@113:     *result = sqrtf(*(float *)argv);
jamie@25: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_average_deviation(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@1:     int n = N;
jamie@44: 
jamie@122:     *result = 0.f;
jamie@113: 
jamie@1:     while(n--)
jamie@140:         *result += fabsf(data[n] - *(float *)argv);
jamie@25: 
jamie@1:     *result /= N;
jamie@1: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_skewness(const float *data, const int N, const void *argv,  float *result)
jamie@140: {
jamie@25: 
jamie@1:     int n = N;
jamie@1: 
jamie@59:     float temp = 0.f;
jamie@25: 
jamie@122:     *result = 0.f;
jamie@113: 
jamie@140:     while(n--)
jamie@140:     {
jamie@140:         temp = (data[n] - ((float *)argv)[0]) / ((float *)argv)[1];
jamie@140:         *result += powf(temp, 3);
jamie@42:     }
jamie@1: 
jamie@42:     *result /= N;
jamie@44: 
jamie@59: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_kurtosis(const float *data, const int N, const void *argv,  float *result)
jamie@140: {
jamie@25: 
jamie@1:     int n = N;
jamie@1: 
jamie@113:     float temp = 0.f;
jamie@113: 
jamie@122:     *result = 0.f;
jamie@25: 
jamie@140:     while(n--)
jamie@140:     {
jamie@140:         temp = (data[n] - ((float *)argv)[0]) / ((float *)argv)[1];
jamie@140:         *result += powf(temp, 4);
jamie@42:     }
jamie@25: 
jamie@42:     *result /= N;
jamie@42:     *result -= 3.0f;
jamie@44: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_spectral_centroid(const float *data, const int N, const void *argv,  float *result)
jamie@140: {
jamie@25: 
jamie@37:     int n = (N >> 1);
jamie@11: 
jamie@43:     const float *freqs, *amps;
jamie@43:     float FA = 0.f, A = 0.f;
jamie@11: 
jamie@52:     amps = data;
jamie@52:     freqs = data + n;
jamie@25: 
jamie@140:     while(n--)
jamie@140:     {
jamie@140:         FA += freqs[n] * amps[n];
jamie@140:         A += amps[n];
jamie@25:     }
jamie@25: 
jamie@113:     if(A == 0.f)
jamie@113:         *result = 0.f;
jamie@113:     else
jamie@113:         *result = FA / A;
jamie@11: 
jamie@56:     return XTRACT_SUCCESS;
jamie@11: }
jamie@11: 
jamie@140: int xtract_spectral_mean(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@52: 
jamie@52:     return xtract_spectral_centroid(data, N, argv, result);
jamie@52: 
jamie@52: }
jamie@52: 
jamie@140: int xtract_spectral_variance(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@52: 
jamie@53:     int m;
jamie@53:     float A = 0.f;
jamie@53:     const float *freqs, *amps;
jamie@52: 
jamie@53:     m = N >> 1;
jamie@52: 
jamie@53:     amps = data;
jamie@53:     freqs = data + m;
jamie@52: 
jamie@122:     *result = 0.f;
jamie@113: 
jamie@140:     while(m--)
jamie@140:     {
jamie@123:         A += amps[m];
jamie@123:         *result += powf(freqs[m] - ((float *)argv)[0], 2) * amps[m];
jamie@53:     }
jamie@53: 
jamie@123:     *result = *result / A;
jamie@52: 
jamie@56:     return XTRACT_SUCCESS;
jamie@52: }
jamie@52: 
jamie@140: int xtract_spectral_standard_deviation(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@52: 
jamie@140:     *result = sqrtf(*(float *)argv);
jamie@52: 
jamie@56:     return XTRACT_SUCCESS;
jamie@52: }
jamie@52: 
jamie@123: /*int xtract_spectral_average_deviation(const float *data, const int N, const void *argv, float *result){
jamie@52: 
jamie@53:     int m;
jamie@53:     float A = 0.f;
jamie@53:     const float *freqs, *amps;
jamie@52: 
jamie@53:     m = N >> 1;
jamie@52: 
jamie@53:     amps = data;
jamie@53:     freqs = data + m;
jamie@52: 
jamie@122:     *result = 0.f;
jamie@113: 
jamie@53:     while(m--){
jamie@123:         A += amps[m];
jamie@123:         *result += fabsf((amps[m] * freqs[m]) - *(float *)argv);
jamie@53:     }
jamie@53: 
jamie@53:     *result /= A;
jamie@52: 
jamie@56:     return XTRACT_SUCCESS;
jamie@123: }*/
jamie@52: 
jamie@140: int xtract_spectral_skewness(const float *data, const int N, const void *argv,  float *result)
jamie@140: {
jamie@52: 
jamie@53:     int m;
jamie@53:     const float *freqs, *amps;
jamie@52: 
jamie@53:     m = N >> 1;
jamie@53: 
jamie@53:     amps = data;
jamie@53:     freqs = data + m;
jamie@52: 
jamie@122:     *result = 0.f;
jamie@113: 
jamie@123:     while(m--)
jamie@123:         *result += powf(freqs[m] - ((float *)argv)[0], 3) * amps[m];
jamie@52: 
jamie@123:     *result /= powf(((float *)argv)[1], 3);
jamie@52: 
jamie@56:     return XTRACT_SUCCESS;
jamie@52: }
jamie@52: 
jamie@140: int xtract_spectral_kurtosis(const float *data, const int N, const void *argv,  float *result)
jamie@140: {
jamie@52: 
jamie@53:     int m;
jamie@53:     const float *freqs, *amps;
jamie@52: 
jamie@53:     m = N >> 1;
jamie@53: 
jamie@53:     amps = data;
jamie@53:     freqs = data + m;
jamie@52: 
jamie@122:     *result = 0.f;
jamie@113: 
jamie@123:     while(m--)
jamie@123:         *result += powf(freqs[m] - ((float *)argv)[0], 4) * amps[m];
jamie@52: 
jamie@123:     *result /= powf(((float *)argv)[1], 4);
jamie@52:     *result -= 3.0f;
jamie@52: 
jamie@56:     return XTRACT_SUCCESS;
jamie@52: }
jamie@52: 
jamie@140: int xtract_irregularity_k(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@1:     int n,
jamie@140:         M = N - 1;
jamie@140: 
jamie@113:     *result = 0.f;
jamie@140: 
jamie@1:     for(n = 1; n < M; n++)
jamie@140:         *result += fabsf(data[n] - (data[n-1] + data[n] + data[n+1]) / 3.f);
jamie@1: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_irregularity_j(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@1:     int n = N;
jamie@1: 
jamie@59:     double num = 0.f, den = 0.f;
jamie@1: 
jamie@140:     while(n--)
jamie@140:     {
jamie@140:         num += powf(data[n] - data[n+1], 2);
jamie@140:         den += powf(data[n], 2);
jamie@1:     }
jamie@25: 
jamie@59:     *result = (float)(num / den);
jamie@1: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_tristimulus_1(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@1:     int n = N;
jamie@1: 
jamie@42:     float den, p1, temp;
jamie@1: 
jamie@42:     den = p1 = temp = 0.f;
jamie@1: 
jamie@140:     for(n = 0; n < N; n++)
jamie@140:     {
jamie@140:         if((temp = data[n]))
jamie@140:         {
jamie@140:             den += temp;
jamie@140:             if(!p1)
jamie@140:                 p1 = temp;
jamie@140:         }
jamie@42:     }
jamie@42: 
jamie@140:     if(den == 0.f || p1 == 0.f)
jamie@140:     {
jamie@113:         *result = 0.f;
jamie@113:         return XTRACT_NO_RESULT;
jamie@113:     }
jamie@140:     else
jamie@140:     {
jamie@113:         *result = p1 / den;
jamie@113:         return XTRACT_SUCCESS;
jamie@113:     }
jamie@1: }
jamie@1: 
jamie@140: int xtract_tristimulus_2(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@1:     int n = N;
jamie@1: 
jamie@113:     float den, p2, p3, p4, ps, temp;
jamie@1: 
jamie@113:     den = p2 = p3 = p4 = ps = temp = 0.f;
jamie@1: 
jamie@140:     for(n = 0; n < N; n++)
jamie@140:     {
jamie@140:         if((temp = data[n]))
jamie@140:         {
jamie@140:             den += temp;
jamie@140:             if(!p2)
jamie@140:                 p2 = temp;
jamie@140:             else if(!p3)
jamie@140:                 p3 = temp;
jamie@140:             else if(!p4)
jamie@140:                 p4 = temp;
jamie@140:         }
jamie@42:     }
jamie@42: 
jamie@113:     ps = p2 + p3 + p4;
jamie@25: 
jamie@140:     if(den == 0.f || ps == 0.f)
jamie@140:     {
jamie@113:         *result = 0.f;
jamie@113:         return XTRACT_NO_RESULT;
jamie@113:     }
jamie@140:     else
jamie@140:     {
jamie@113:         *result = ps / den;
jamie@113:         return XTRACT_SUCCESS;
jamie@113:     }
jamie@113: 
jamie@1: }
jamie@1: 
jamie@140: int xtract_tristimulus_3(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@42:     int n = N, count = 0;
jamie@1: 
jamie@42:     float den, num, temp;
jamie@1: 
jamie@42:     den = num = temp = 0.f;
jamie@1: 
jamie@140:     for(n = 0; n < N; n++)
jamie@140:     {
jamie@140:         if((temp = data[n]))
jamie@140:         {
jamie@140:             den += temp;
jamie@140:             if(count >= 5)
jamie@140:                 num += temp;
jamie@140:             count++;
jamie@140:         }
jamie@42:     }
jamie@25: 
jamie@140:     if(den == 0.f || num == 0.f)
jamie@140:     {
jamie@113:         *result = 0.f;
jamie@113:         return XTRACT_NO_RESULT;
jamie@113:     }
jamie@140:     else
jamie@140:     {
jamie@113:         *result = num / den;
jamie@113:         return XTRACT_SUCCESS;
jamie@113:     }
jamie@1: }
jamie@1: 
jamie@140: int xtract_smoothness(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@59:     int n, M;
jamie@1: 
jamie@43:     float *input;
jamie@43: 
jamie@43:     input = (float *)malloc(N * sizeof(float));
jamie@59:     memcpy(input, data, N * sizeof(float));
jamie@43: 
jamie@140:     if (input[0] <= 0)
jamie@113:         input[0] = XTRACT_LOG_LIMIT;
jamie@140:     if (input[1] <= 0)
jamie@113:         input[1] = XTRACT_LOG_LIMIT;
jamie@25: 
jamie@59:     M = N - 1;
jamie@59: 
jamie@140:     for(n = 1; n < M; n++)
jamie@140:     {
jamie@140:         if(input[n+1] <= 0)
jamie@113:             input[n+1] = XTRACT_LOG_LIMIT;
jamie@140:         *result += fabsf(20.f * logf(input[n]) - (20.f * logf(input[n-1]) +
jamie@140:                          20.f * logf(input[n]) + 20.f * logf(input[n+1])) / 3.f);
jamie@25:     }
jamie@43: 
jamie@43:     free(input);
jamie@44: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_spread(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@140:     return xtract_spectral_variance(data, N, argv, result);
jamie@1: }
jamie@1: 
jamie@140: int xtract_zcr(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@1:     int n = N;
jamie@25: 
jamie@1:     for(n = 1; n < N; n++)
jamie@140:         if(data[n] * data[n-1] < 0) (*result)++;
jamie@25: 
jamie@113:     *result /= (float)N;
jamie@25: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_rolloff(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@1:     int n = N;
jamie@55:     float pivot, temp, percentile;
jamie@42: 
jamie@42:     pivot = temp = 0.f;
jamie@55:     percentile = ((float *)argv)[1];
jamie@25: 
jamie@140:     while(n--) pivot += data[n];
jamie@25: 
jamie@55:     pivot *= percentile / 100.f;
jamie@25: 
jamie@42:     for(n = 0; temp < pivot; n++)
jamie@140:         temp += data[n];
jamie@1: 
jamie@55:     *result = n * ((float *)argv)[0];
jamie@55:     /* *result = (n / (float)N) * (((float *)argv)[1] * .5); */
jamie@25: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_loudness(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@47:     int n = N, rv;
jamie@25: 
jamie@113:     *result = 0.f;
jamie@113: 
jamie@140:     if(n > XTRACT_BARK_BANDS)
jamie@140:     {
jamie@140:         n = XTRACT_BARK_BANDS;
jamie@140:         rv = XTRACT_BAD_VECTOR_SIZE;
jamie@93:     }
jamie@47:     else
jamie@140:         rv = XTRACT_SUCCESS;
jamie@1: 
jamie@1:     while(n--)
jamie@140:         *result += powf(data[n], 0.23);
jamie@38: 
jamie@47:     return rv;
jamie@1: }
jamie@1: 
jamie@140: int xtract_flatness(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@113:     int n, count, denormal_found;
jamie@1: 
jamie@140:     double num, den, temp;
jamie@25: 
jamie@113:     num = 1.f;
jamie@113:     den = temp = 0.f;
jamie@43: 
jamie@113:     denormal_found = 0;
jamie@113:     count = 0;
jamie@113: 
jamie@140:     for(n = 0; n < N; n++)
jamie@140:     {
jamie@140:         if((temp = data[n]) != 0.f)
jamie@140:         {
jamie@140:             if (xtract_is_denormal(num))
jamie@140:             {
jamie@113:                 denormal_found = 1;
jamie@113:                 break;
jamie@113:             }
jamie@113:             num *= temp;
jamie@113:             den += temp;
jamie@113:             count++;
jamie@113:         }
jamie@1:     }
jamie@44: 
jamie@140:     if(!count)
jamie@140:     {
jamie@113:         *result = 0.f;
jamie@113:         return XTRACT_NO_RESULT;
jamie@113:     }
jamie@25: 
jamie@113:     num = powf(num, 1.f / (float)N);
jamie@113:     den /= (float)N;
jamie@44: 
jamie@44: 
jamie@113:     *result = (float) (num / den);
jamie@113: 
jamie@113:     if(denormal_found)
jamie@113:         return XTRACT_DENORMAL_FOUND;
jamie@113:     else
jamie@113:         return XTRACT_SUCCESS;
jamie@140: 
jamie@113: }
jamie@113: 
jamie@140: int xtract_flatness_db(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@113: 
jamie@115:     float flatness;
jamie@113: 
jamie@115:     flatness = *(float *)argv;
jamie@113: 
jamie@140:     if (flatness <= 0)
jamie@115:         flatness = XTRACT_LOG_LIMIT;
jamie@113: 
jamie@115:     *result = 10 * log10f(flatness);
jamie@25: 
jamie@56:     return XTRACT_SUCCESS;
jamie@44: 
jamie@1: }
jamie@1: 
jamie@140: int xtract_tonality(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@113:     float sfmdb;
jamie@25: 
jamie@113:     sfmdb = *(float *)argv;
jamie@1: 
jamie@113:     *result = XTRACT_MIN(sfmdb / -60.f, 1);
jamie@25: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_crest(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@140:     float max, mean;
jamie@45: 
jamie@45:     max = mean = 0.f;
jamie@45: 
jamie@45:     max = *(float *)argv;
jamie@45:     mean = *((float *)argv+1);
jamie@45: 
jamie@45:     *result = max / mean;
jamie@45: 
jamie@56:     return XTRACT_SUCCESS;
jamie@25: 
jamie@1: }
jamie@1: 
jamie@140: int xtract_noisiness(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@45:     float h, i, p; /*harmonics, inharmonics, partials */
jamie@45: 
jamie@45:     i = p = h = 0.f;
jamie@45: 
jamie@45:     h = *(float *)argv;
jamie@45:     p = *((float *)argv+1);
jamie@45: 
jamie@45:     i = p - h;
jamie@45: 
jamie@45:     *result = i / p;
jamie@45: 
jamie@56:     return XTRACT_SUCCESS;
jamie@25: 
jamie@1: }
jamie@2: 
jamie@140: int xtract_rms_amplitude(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@1:     int n = N;
jamie@1: 
jamie@113:     *result = 0.f;
jamie@113: 
jamie@56:     while(n--) *result += XTRACT_SQ(data[n]);
jamie@1: 
jamie@113:     *result = sqrtf(*result / (float)N);
jamie@25: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@140: int xtract_spectral_inharmonicity(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@41:     int n = N >> 1;
jamie@140:     float num = 0.f, den = 0.f, fund;
jamie@43:     const float *freqs, *amps;
jamie@1: 
jamie@41:     fund = *(float *)argv;
jamie@52:     amps = data;
jamie@52:     freqs = data + n;
jamie@25: 
jamie@140:     while(n--)
jamie@140:     {
jamie@140:         if(amps[n])
jamie@140:         {
jamie@140:             num += fabsf(freqs[n] - n * fund) * XTRACT_SQ(amps[n]);
jamie@140:             den += XTRACT_SQ(amps[n]);
jamie@140:         }
jamie@1:     }
jamie@1: 
jamie@140:     *result = (2 * num) / (fund * den);
jamie@25: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@1: 
jamie@140: int xtract_power(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@56:     return XTRACT_FEATURE_NOT_IMPLEMENTED;
jamie@25: 
jamie@1: }
jamie@1: 
jamie@140: int xtract_odd_even_ratio(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@43:     int M = (N >> 1), n;
jamie@1: 
jamie@113:     float odd = 0.f, even = 0.f,  temp;
jamie@44: 
jamie@140:     for(n = 0; n < M; n++)
jamie@140:     {
jamie@140:         if((temp = data[n]))
jamie@140:         {
jamie@140:             if(XTRACT_IS_ODD(n))
jamie@140:             {
jamie@140:                 odd += temp;
jamie@140:             }
jamie@140:             else
jamie@140:             {
jamie@140:                 even += temp;
jamie@140:             }
jamie@140:         }
jamie@1:     }
jamie@1: 
jamie@140:     if(odd == 0.f || even == 0.f)
jamie@140:     {
jamie@113:         *result = 0.f;
jamie@113:         return XTRACT_NO_RESULT;
jamie@113:     }
jamie@140:     else
jamie@140:     {
jamie@113:         *result = odd / even;
jamie@113:         return XTRACT_SUCCESS;
jamie@113:     }
jamie@1: }
jamie@1: 
jamie@140: int xtract_sharpness(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@48:     int n = N, rv;
jamie@113:     float sl, g; /* sl = specific loudness */
jamie@140:     double temp;
jamie@48: 
jamie@113:     sl = g = 0.f;
jamie@113:     temp = 0.f;
jamie@48: 
jamie@140:     if(n > XTRACT_BARK_BANDS)
jamie@140:         rv = XTRACT_BAD_VECTOR_SIZE;
jamie@48:     else
jamie@140:         rv = XTRACT_SUCCESS;
jamie@48: 
jamie@48: 
jamie@140:     while(n--)
jamie@140:     {
jamie@140:         sl = powf(data[n], 0.23);
jamie@140:         g = (n < 15 ? 1.f : 0.066 * expf(0.171 * n));
jamie@140:         temp += n * g * sl;
jamie@48:     }
jamie@48: 
jamie@113:     temp = 0.11 * temp / (float)N;
jamie@113:     *result = (float)temp;
jamie@48: 
jamie@48:     return rv;
jamie@25: 
jamie@1: }
jamie@1: 
jamie@140: int xtract_spectral_slope(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@140:     const float *freqs, *amps;
jamie@48:     float f, a,
jamie@140:           F, A, FA, FXTRACT_SQ; /* sums of freqs, amps, freq * amps, freq squared */
jamie@140:     int n, M;
jamie@140: 
jamie@56:     F = A = FA = FXTRACT_SQ = 0.f;
jamie@48:     n = M = N >> 1;
jamie@48: 
jamie@52:     amps = data;
jamie@52:     freqs = data + n;
jamie@48: 
jamie@140:     while(n--)
jamie@140:     {
jamie@140:         f = freqs[n];
jamie@140:         a = amps[n];
jamie@140:         F += f;
jamie@140:         A += a;
jamie@140:         FA += f * a;
jamie@140:         FXTRACT_SQ += f * f;
jamie@48:     }
jamie@48: 
jamie@140:     *result = (1.f / A) * (M * FA - F * A) / (M * FXTRACT_SQ - F * F);
jamie@48: 
jamie@56:     return XTRACT_SUCCESS;
jamie@25: 
jamie@1: }
jamie@1: 
jamie@140: int xtract_lowest_value(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@25: 
jamie@45:     int n = N;
jamie@45:     float temp;
jamie@45: 
jamie@46:     *result = data[--n];
jamie@45: 
jamie@140:     while(n--)
jamie@140:     {
jamie@140:         if((temp = data[n]) > *(float *)argv)
jamie@140:             *result = XTRACT_MIN(*result, data[n]);
jamie@45:     }
jamie@45: 
jamie@56:     return XTRACT_SUCCESS;
jamie@45: }
jamie@45: 
jamie@140: int xtract_highest_value(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@45: 
jamie@1:     int n = N;
jamie@1: 
jamie@46:     *result = data[--n];
jamie@44: 
jamie@140:     while(n--)
jamie@140:         *result = XTRACT_MAX(*result, data[n]);
jamie@44: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@1: 
jamie@45: 
jamie@140: int xtract_sum(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@45: 
jamie@45:     int n = N;
jamie@45: 
jamie@113:     *result = 0.f;
jamie@113: 
jamie@45:     while(n--)
jamie@140:         *result += *data++;
jamie@45: 
jamie@56:     return XTRACT_SUCCESS;
jamie@45: 
jamie@45: }
jamie@45: 
jamie@140: int xtract_nonzero_count(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@59: 
jamie@59:     int n = N;
jamie@140: 
jamie@122:     *result = 0.f;
jamie@59: 
jamie@59:     while(n--)
jamie@140:         *result += (*data++ ? 1 : 0);
jamie@59: 
jamie@59:     return XTRACT_SUCCESS;
jamie@59: 
jamie@59: }
jamie@59: 
jamie@140: int xtract_hps(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@1: 
jamie@1:     int n = N, M, m, l, peak_index, position1_lwr;
jamie@140:     float *coeffs2, *coeffs3, *product, L,
jamie@140:           largest1_lwr, peak, ratio1, sr;
jamie@1: 
jamie@25:     sr = *(float*)argv;
jamie@78:     if(sr == 0)
jamie@140:         sr = 44100.f;
jamie@25: 
jamie@1:     coeffs2 = (float *)malloc(N * sizeof(float));
jamie@1:     coeffs3 = (float *)malloc(N * sizeof(float));
jamie@1:     product = (float *)malloc(N * sizeof(float));
jamie@25: 
jamie@1:     while(n--) coeffs2[n] = coeffs3[n] = 1;
jamie@1: 
jamie@1:     M = N >> 1;
jamie@113:     L = N / 3.f;
jamie@1: 
jamie@140:     while(M--)
jamie@140:     {
jamie@140:         m = M << 1;
jamie@140:         coeffs2[M] = (data[m] + data[m+1]) * 0.5f;
jamie@1: 
jamie@140:         if(M < L)
jamie@140:         {
jamie@140:             l = M * 3;
jamie@140:             coeffs3[M] = (data[l] + data[l+1] + data[l+2]) / 3.f;
jamie@140:         }
jamie@1:     }
jamie@25: 
jamie@1:     peak_index = peak = 0;
jamie@25: 
jamie@140:     for(n = 1; n < N; n++)
jamie@140:     {
jamie@140:         product[n] = data[n] * coeffs2[n] * coeffs3[n];
jamie@140:         if(product[n] > peak)
jamie@140:         {
jamie@140:             peak_index = n;
jamie@140:             peak = product[n];
jamie@140:         }
jamie@1:     }
jamie@1: 
jamie@1:     largest1_lwr = position1_lwr = 0;
jamie@1: 
jamie@140:     for(n = 0; n < N; n++)
jamie@140:     {
jamie@140:         if(data[n] > largest1_lwr && n != peak_index)
jamie@140:         {
jamie@140:             largest1_lwr = data[n];
jamie@140:             position1_lwr = n;
jamie@140:         }
jamie@1:     }
jamie@1: 
jamie@1:     ratio1 = data[position1_lwr] / data[peak_index];
jamie@1: 
jamie@140:     if(position1_lwr > peak_index * 0.4 && position1_lwr <
jamie@140:             peak_index * 0.6 && ratio1 > 0.1)
jamie@140:         peak_index = position1_lwr;
jamie@1: 
jamie@140:     *result = sr / (float)peak_index;
jamie@25: 
jamie@1:     free(coeffs2);
jamie@1:     free(coeffs3);
jamie@1:     free(product);
jamie@25: 
jamie@56:     return XTRACT_SUCCESS;
jamie@1: }
jamie@5: 
jamie@5: 
jamie@140: int xtract_f0(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@5: 
jamie@78:     int M, tau, n;
jamie@78:     float sr;
jamie@43:     size_t bytes;
jamie@140:     float f0, err_tau_1, err_tau_x, array_max,
jamie@140:           threshold_peak, threshold_centre,
jamie@140:           *input;
jamie@22: 
jamie@25:     sr = *(float *)argv;
jamie@78:     if(sr == 0)
jamie@140:         sr = 44100.f;
jamie@43: 
jamie@43:     input = (float *)malloc(bytes = N * sizeof(float));
jamie@43:     input = memcpy(input, data, bytes);
jamie@25:     /*  threshold_peak = *((float *)argv+1);
jamie@140:     threshold_centre = *((float *)argv+2);
jamie@140:     printf("peak: %.2f\tcentre: %.2f\n", threshold_peak, threshold_centre);*/
jamie@25:     /* add temporary dynamic control over thresholds to test clipping effects */
jamie@22: 
jamie@25:     /* FIX: tweak and  make into macros */
jamie@25:     threshold_peak = .8;
jamie@25:     threshold_centre = .3;
jamie@25:     M = N >> 1;
jamie@25:     err_tau_1 = 0;
jamie@25:     array_max = 0;
jamie@25: 
jamie@25:     /* Find the array max */
jamie@140:     for(n = 0; n < N; n++)
jamie@140:     {
jamie@140:         if (input[n] > array_max)
jamie@140:             array_max = input[n];
jamie@12:     }
jamie@25: 
jamie@25:     threshold_peak *= array_max;
jamie@25: 
jamie@25:     /* peak clip */
jamie@140:     for(n = 0; n < N; n++)
jamie@140:     {
jamie@140:         if(input[n] > threshold_peak)
jamie@140:             input[n] = threshold_peak;
jamie@140:         else if(input[n] < -threshold_peak)
jamie@140:             input[n] = -threshold_peak;
jamie@25:     }
jamie@25: 
jamie@25:     threshold_centre *= array_max;
jamie@25: 
jamie@25:     /* Centre clip */
jamie@140:     for(n = 0; n < N; n++)
jamie@140:     {
jamie@140:         if (input[n] < threshold_centre)
jamie@140:             input[n] = 0;
jamie@140:         else
jamie@140:             input[n] -= threshold_centre;
jamie@25:     }
jamie@25: 
jamie@25:     /* Estimate fundamental freq */
jamie@25:     for (n = 1; n < M; n++)
jamie@140:         err_tau_1 = err_tau_1 + fabsf(input[n] - input[n+1]);
jamie@140:     /* FIX: this doesn't pose too much load if it returns 'early', but if it can't find f0, load can be significant for larger block sizes M^2 iterations! */
jamie@140:     for (tau = 2; tau < M; tau++)
jamie@140:     {
jamie@140:         err_tau_x = 0;
jamie@140:         for (n = 1; n < M; n++)
jamie@140:         {
jamie@140:             err_tau_x = err_tau_x + fabsf(input[n] - input[n+tau]);
jamie@140:         }
jamie@140:         if (err_tau_x < err_tau_1)
jamie@140:         {
jamie@140:             f0 = sr / (tau + (err_tau_x / err_tau_1));
jamie@140:             *result = f0;
jamie@140:             free(input);
jamie@140:             return XTRACT_SUCCESS;
jamie@140:         }
jamie@25:     }
jamie@43:     *result = -0;
jamie@43:     free(input);
jamie@56:     return XTRACT_NO_RESULT;
jamie@5: }
jamie@43: 
jamie@140: int xtract_failsafe_f0(const float *data, const int N, const void *argv, float *result)
jamie@140: {
jamie@44: 
jamie@59:     float *spectrum = NULL, argf[2], *peaks = NULL, return_code, sr;
jamie@44: 
jamie@43:     return_code = xtract_f0(data, N, argv, result);
jamie@44: 
jamie@140:     if(return_code == XTRACT_NO_RESULT)
jamie@140:     {
jamie@44: 
jamie@140:         sr = *(float *)argv;
jamie@140:         if(sr == 0)
jamie@140:             sr = 44100.f;
jamie@140:         spectrum = (float *)malloc(N * sizeof(float));
jamie@140:         peaks = (float *)malloc(N * sizeof(float));
jamie@140:         argf[0] = sr;
jamie@140:         argf[1] = XTRACT_MAGNITUDE_SPECTRUM;
jamie@140:         xtract_spectrum(data, N, argf, spectrum);
jamie@140:         argf[1] = 10.f;
jamie@140:         xtract_peak_spectrum(spectrum, N >> 1, argf, peaks);
jamie@140:         argf[0] = 0.f;
jamie@140:         xtract_lowest_value(peaks+(N >> 1), N >> 1, argf, result);
jamie@44: 
jamie@140:         free(spectrum);
jamie@140:         free(peaks);
jamie@43:     }
jamie@43: 
jamie@56:     return XTRACT_SUCCESS;
jamie@43: 
jamie@43: }
jamie@44: