From 6d00829a8ccef20c0ce7eeecc54cd3bb5f94b3bd Mon Sep 17 00:00:00 2001 From: Jamie Bullock Date: Mon, 2 Oct 2006 14:18:15 +0000 Subject: Initial import --- AUTHORS | 0 COPYING | 340 ++++++++++++++++++++++++++++++++++++++++ ChangeLog | 0 HEADER | 20 +++ Makefile.am | 2 + NEWS | 0 README | 0 autogen.sh | 54 +++++++ config.h.in | 61 ++++++++ configure.in | 41 +++++ src/Makefile.am | 15 ++ src/delta.c | 49 ++++++ src/init.c | 124 +++++++++++++++ src/libxtract.c | 87 +++++++++++ src/scalar.c | 414 +++++++++++++++++++++++++++++++++++++++++++++++++ src/vector.c | 228 +++++++++++++++++++++++++++ xtract/Makefile.am | 5 + xtract/libxtract.h | 182 ++++++++++++++++++++++ xtract/xtract_delta.h | 61 ++++++++ xtract/xtract_macros.h | 41 +++++ xtract/xtract_scalar.h | 144 +++++++++++++++++ xtract/xtract_types.h | 46 ++++++ xtract/xtract_vector.h | 65 ++++++++ 23 files changed, 1979 insertions(+) create mode 100644 AUTHORS create mode 100644 COPYING create mode 100644 ChangeLog create mode 100644 HEADER create mode 100644 Makefile.am create mode 100644 NEWS create mode 100644 README create mode 100755 autogen.sh create mode 100644 config.h.in create mode 100644 configure.in create mode 100644 src/Makefile.am create mode 100644 src/delta.c create mode 100644 src/init.c create mode 100644 src/libxtract.c create mode 100644 src/scalar.c create mode 100644 src/vector.c create mode 100644 xtract/Makefile.am create mode 100644 xtract/libxtract.h create mode 100644 xtract/xtract_delta.h create mode 100644 xtract/xtract_macros.h create mode 100644 xtract/xtract_scalar.h create mode 100644 xtract/xtract_types.h create mode 100644 xtract/xtract_vector.h diff --git a/AUTHORS b/AUTHORS new file mode 100644 index 0000000..e69de29 diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..3912109 --- /dev/null +++ b/COPYING @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. 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See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/ChangeLog b/ChangeLog new file mode 100644 index 0000000..e69de29 diff --git a/HEADER b/HEADER new file mode 100644 index 0000000..81a0d30 --- /dev/null +++ b/HEADER @@ -0,0 +1,20 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + diff --git a/Makefile.am b/Makefile.am new file mode 100644 index 0000000..b9bce3f --- /dev/null +++ b/Makefile.am @@ -0,0 +1,2 @@ +SUBDIRS = src xtract + diff --git a/NEWS b/NEWS new file mode 100644 index 0000000..e69de29 diff --git a/README b/README new file mode 100644 index 0000000..e69de29 diff --git a/autogen.sh b/autogen.sh new file mode 100755 index 0000000..8afd398 --- /dev/null +++ b/autogen.sh @@ -0,0 +1,54 @@ +#!/bin/sh + +# This works on Gentoo, whose automake wrapper is based on Mandrake: +WANT_AUTOMAKE=1.7 +export WANT_AUTOMAKE + + +case `uname -s` in + Linux) + LIBTOOLIZE=libtoolize + ACLOCALARGS='' + ;; + Darwin) + LIBTOOLIZE=glibtoolize + ACLOCALARGS='-I /usr/local/share/aclocal' + ;; + *) echo error: unrecognized OS + exit 1 + ;; +esac + +AUTOMAKE_REQ=1.7 + +# Automake version check from MusE +lessthan () { + ver1="$1" + ver2="$2" + + major1=$( echo $ver1 | sed "s/^\([0-9]*\)\..*/\1/"); + minor1=$( echo $ver1 | sed "s/^[^\.]*\.\([0-9]*\).*/\1/" ); + major2=$( echo $ver2 | sed "s/^\([0-9]*\)\..*/\1/"); + minor2=$( echo $ver2 | sed "s/^[^\.]*\.\([0-9]*\).*/\1/" ); + test "$major1" -lt "$major2" || test "$minor1" -lt "$minor2"; +} + +amver=$( automake --version | head -n 1 | sed "s/.* //" ); +if lessthan $amver $AUTOMAKE_REQ ; then + echo "you must have automake version >= $AUTOMAKE_REQ to proper plugin support" + exit 1 +fi + + +echo "=============== running libtoolize --force --copy" && + $LIBTOOLIZE --force --copy && + echo "=============== running aclocal" && + aclocal $ACLOCALARGS && + echo "=============== running autoheader" && + autoheader && + echo "=============== running automake --add-missing --foreign" && + automake --add-missing --foreign && + echo "=============== running autoconf" && + autoconf && + echo "=============== done" + diff --git a/config.h.in b/config.h.in new file mode 100644 index 0000000..01dc576 --- /dev/null +++ b/config.h.in @@ -0,0 +1,61 @@ +/* config.h.in. Generated from configure.in by autoheader. */ + +/* Build the vector functions */ +#undef BUILD_VECTOR + +/* Define to 1 if you have the header file. */ +#undef HAVE_DLFCN_H + +/* Define to 1 if you have the header file. */ +#undef HAVE_INTTYPES_H + +/* Define to 1 if you have the header file. */ +#undef HAVE_MATH_H + +/* Define to 1 if you have the header file. */ +#undef HAVE_MEMORY_H + +/* Define to 1 if you have the header file. */ +#undef HAVE_STDINT_H + +/* Define to 1 if you have the header file. */ +#undef HAVE_STDLIB_H + +/* Define to 1 if you have the header file. */ +#undef HAVE_STRINGS_H + +/* Define to 1 if you have the header file. */ +#undef HAVE_STRING_H + +/* Define to 1 if you have the header file. */ +#undef HAVE_SYS_STAT_H + +/* Define to 1 if you have the header file. */ +#undef HAVE_SYS_TYPES_H + +/* Define to 1 if you have the header file. */ +#undef HAVE_UNISTD_H + +/* Name of package */ +#undef PACKAGE + +/* Define to the address where bug reports for this package should be sent. */ +#undef PACKAGE_BUGREPORT + +/* Define to the full name of this package. */ +#undef PACKAGE_NAME + +/* Define to the full name and version of this package. */ +#undef PACKAGE_STRING + +/* Define to the one symbol short name of this package. */ +#undef PACKAGE_TARNAME + +/* Define to the version of this package. */ +#undef PACKAGE_VERSION + +/* Define to 1 if you have the ANSI C header files. */ +#undef STDC_HEADERS + +/* Version number of package */ +#undef VERSION diff --git a/configure.in b/configure.in new file mode 100644 index 0000000..4729c3f --- /dev/null +++ b/configure.in @@ -0,0 +1,41 @@ +AC_PREREQ(2.13) +AC_INIT(src/libxtract.c) + +PACKAGE=libxtract +VERSION=0.1.0 + +AM_INIT_AUTOMAKE($PACKAGE, $VERSION) +AM_CONFIG_HEADER(config.h) +AC_PROG_CC +AC_PROG_INSTALL +AC_ENABLE_STATIC(no) +AC_ENABLE_SHARED(yes) +AC_PROG_LIBTOOL +#AC_ARG_WITH(fftw, AC_HELP_STRING([--with-vector], [build vector features]), +# [ if test $withval = "yes"; then with_vector=yes ; +# else with_vector=no ; fi ], with_vector=no) + +AC_CHECK_HEADERS([math.h]) + +AC_ARG_ENABLE(vector, + [ --enable-vector Turn fft-based vector processing on], + [case "${enableval}" in + yes) vector=true ;; + no) vector=false ;; + *) AC_MSG_ERROR(bad value ${enableval} for --enable-vector) ;; + esac],[vector=false]) + +XTRACT_SO_VERSION=0:0:0 +CFLAGS="-pedantic -ansi" +LDFLAGS="-lm" + +dnl Are we building with fftw? +#if [[ "$with_vector" = "yes" ]] ; then +if [[ "$vector" = "true" ]] ; then + LDFLAGS="$LDFLAGS -lfftw3f" + AC_DEFINE([BUILD_VECTOR], [1], [Build the vector functions]) +fi + +AM_CONDITIONAL(BUILD_VECTOR, test "x${vector}" = 'xtrue') + +AC_OUTPUT(Makefile src/Makefile xtract/Makefile) diff --git a/src/Makefile.am b/src/Makefile.am new file mode 100644 index 0000000..cf4125c --- /dev/null +++ b/src/Makefile.am @@ -0,0 +1,15 @@ + + + +SOURCES = libxtract.c scalar.c delta.c init.c + +if BUILD_VECTOR +VECTOR = vector.c +else +VECTOR = +endif + +lib_LTLIBRARIES = libxtract.la +libxtract_la_CFLAGS = -pedantic -ansi -g -O0 -ggdb +libxtract_la_SOURCES = $(SOURCES) $(VECTOR) +libxtract_la_LDFLAGS = -shared diff --git a/src/delta.c b/src/delta.c new file mode 100644 index 0000000..c947c0a --- /dev/null +++ b/src/delta.c @@ -0,0 +1,49 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +/* xtract_delta.c: defines functions that extract a feature as a single value from more than one input vector */ + +#include "xtract/xtract_delta.h" +#include "xtract/xtract_macros.h" + +int xtract_flux(float *data, int N, void *argv , float *result){ + + NOT_IMPLEMENTED; + +} + +int xtract_attack_time(float *data, int N, void *argv , float *result){ + + NOT_IMPLEMENTED; + +} + +int xtract_decay_time(float *data, int N, void *argv, float *result){ + + NOT_IMPLEMENTED; + +} + +int xtract_delta_feature(float *data, int N, void *argv, float *result){ + + NOT_IMPLEMENTED; + +} + diff --git a/src/init.c b/src/init.c new file mode 100644 index 0000000..5b7bdf2 --- /dev/null +++ b/src/init.c @@ -0,0 +1,124 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +/* init.c: defines functions that extract a feature as a single value from an input vector */ + +#include "xtract/libxtract.h" +#include +#include + +int xtract_init_mfcc(int N, float nyquist, int style, float freq_max, float freq_min, int freq_bands, float **fft_tables){ + + int n,i, *fft_peak, M; + float norm, mel_freq_max, mel_freq_min, norm_fact, height, inc, val, + freq_bw_mel, *mel_peak, *height_norm, *lin_peak; + + + mel_peak = height_norm = lin_peak = NULL; + fft_peak = NULL; + norm = 1; + + mel_freq_max = 1127 * log(1 + freq_max / 700); + mel_freq_min = 1127 * log(1 + freq_min / 700); + freq_bw_mel = (mel_freq_max - mel_freq_min) / freq_bands; + + mel_peak = (float *)malloc((freq_bands + 2) * sizeof(float)); + /* +2 for zeros at start and end */ + lin_peak = (float *)malloc((freq_bands + 2) * sizeof(float)); + fft_peak = (int *)malloc((freq_bands + 2) * sizeof(int)); + height_norm = (float *)malloc(freq_bands * sizeof(float)); + + if(mel_peak == NULL || height_norm == NULL || + lin_peak == NULL || fft_peak == NULL) + return MALLOC_FAILED; + + M = N >> 1; + + mel_peak[0] = mel_freq_min; + lin_peak[0] = 700 * (exp(mel_peak[0] / 1127) - 1); + fft_peak[0] = lin_peak[0] / nyquist * M; + + + for (n = 1; n <= freq_bands; n++){ + /*roll out peak locations - mel, linear and linear on fft window scale */ + mel_peak[n] = mel_peak[n - 1] + freq_bw_mel; + lin_peak[n] = 700 * (exp(mel_peak[n] / 1127) -1); + fft_peak[n] = lin_peak[n] / nyquist * M; + } + + for (n = 0; n < freq_bands; n++){ + /*roll out normalised gain of each peak*/ + if (style == EQUAL_GAIN){ + height = 1; + norm_fact = norm; + } + else{ + height = 2 / (lin_peak[n + 2] - lin_peak[n]); + norm_fact = norm / (2 / (lin_peak[2] - lin_peak[0])); + } + height_norm[n] = height * norm_fact; + } + + i = 0; + + for(n = 0; n < freq_bands; n++){ + if(n > 0) + /*calculate the rise increment*/ + inc = height_norm[n] / (fft_peak[n] - fft_peak[n - 1]); + else + inc = height_norm[n] / fft_peak[n]; + val = 0; + for(; i <= fft_peak[n]; i++){ + /*fill in the 'rise' */ + fft_tables[n][i] = val; + val += inc; + } + inc = height_norm[n] / (fft_peak[n + 1] - fft_peak[n]); + /*calculate the fall increment */ + val = 0; + for(i = fft_peak[n + 1]; i > fft_peak[n]; i--){ + /*reverse fill the 'fall' */ + fft_tables[n][i] = val; + val += inc; + } + } + + + free(mel_peak); + free(lin_peak); + free(height_norm); + free(fft_peak); + + return SUCCESS; + +} + +int xtract_init_bark(int N, float nyquist, int *band_limits){ + + float bark_freq_max, bark_freq_min, freq_bw_bark, temp, edges[] = {0, 100, 200, 300, 400, 510, 630, 770, 920, 1080, 1270, 1480, 1720, 2000, 2320, 2700, 3150, 3700, 4400, 5300, 6400, 7700, 9500, 12000, 15500, 20500, 27000}; /* Takes us up to sr = 54kHz (CCRMA: JOS)*/ + + int M, bands = BARK_BANDS; + + M = N >> 1; + + while(bands--) + band_limits[bands] = edges[bands] / nyquist * M; + /*FIX shohuld use rounding, but couldn't get it to work */ +} diff --git a/src/libxtract.c b/src/libxtract.c new file mode 100644 index 0000000..afd2581 --- /dev/null +++ b/src/libxtract.c @@ -0,0 +1,87 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +/* libxtract - library for feature extraction from 1D vectors +Copyright (C) 2006 Jamie Bullock + +This program is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License +as published by the Free Software Foundation; either version 2 +of the License, or (at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. +*/ + + +#include "xtract/libxtract.h" + +int(*xtract[])(float *, int, void *, float *) = { + /* xtract_scalar.h */ + xtract_mean, + xtract_variance, + xtract_standard_deviation, + xtract_average_deviation, + xtract_skewness, + xtract_kurtosis, + xtract_irregularity_k, + xtract_irregularity_j, + xtract_tristimulus_1, + xtract_tristimulus_2, + xtract_tristimulus_3, + xtract_smoothness, + xtract_spread, + xtract_zcr, + xtract_rolloff, + xtract_loudness, + xtract_flatness, + xtract_tonality, + xtract_crest, + xtract_noisiness, + xtract_rms_amplitude, + xtract_inharmonicity, + xtract_power, + xtract_odd_even_ratio, + xtract_sharpness, + xtract_slope, + xtract_f0, + xtract_hps, + /* xtract_vector.h */ + xtract_magnitude_spectrum, + xtract_autocorrelation, + xtract_autocorrelation_fft, + xtract_amdf, + xtract_asdf, + xtract_mfcc, + xtract_dct, + xtract_bark_coefficients, + xtract_peaks, + /* xtract_delta.h */ + xtract_flux, + xtract_attack_time, + xtract_decay_time, + xtract_delta_feature +}; diff --git a/src/scalar.c b/src/scalar.c new file mode 100644 index 0000000..a7191ef --- /dev/null +++ b/src/scalar.c @@ -0,0 +1,414 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + + +/* xtract_scalar.c: defines functions that extract a feature as a single value from an input vector */ + +#include "xtract/libxtract.h" +#include "math.h" + +int xtract_mean(float *data, int N, void *argv, float *result){ + + int n = N; + + while(n--) + *result += *data++; + + *result /= N; +} + +int xtract_variance(float *data, int N, void *argv, float *result){ + + int n = N; + + while(n--) + *result += *data++ - *(float *)argv; + + *result = SQ(*result) / (N - 1); +} + +int xtract_standard_deviation(float *data, int N, void *argv, float *result){ + + *result = sqrt(*(float *)argv); + +} + +int xtract_average_deviation(float *data, int N, void *argv, float *result){ + + int n = N; + + while(n--) + *result += fabs(*data++ - *(float *)argv); + + *result /= N; + +} + +int xtract_skewness(float *data, int N, void *argv, float *result){ + + int n = N; + + while(n--) + *result += (*data++ - ((float *)argv)[0]) / ((float *)argv)[1]; + + *result = pow(*result, 3) / N; + +} + +int xtract_kurtosis(float *data, int N, void *argv, float *result){ + + int n = N; + + while(n--) + *result += (*data++ - ((float *)argv)[0]) / ((float *)argv)[1]; + + *result = pow(*result, 4) / N - 3; + +} + +int xtract_irregularity_k(float *data, int N, void *argv, float *result){ + + int n, + M = M - 1; + + for(n = 1; n < M; n++) + *result += abs(data[n] - (data[n-1] + data[n] + data[n+1]) / 3); + +} + +int xtract_irregularity_j(float *data, int N, void *argv, float *result){ + + int n = N; + + float num, den; + + while(n--){ + num += data[n] - data[n+1]; + den += data[n] * data[n]; + } + + *result = num / den; + +} + +int xtract_tristimulus_1(float *data, int N, void *argv, float *result){ + + int n = N; + + float den; + + while(n--) + den += data[n]; + + *result = data[0] / den; + +} + +int xtract_tristimulus_2(float *data, int N, void *argv, float *result){ + + int n = N; + + float den; + + while(n--) + den += data[n]; + + *result = (data[1] + data[2] + data[3]) / den; + +} + +int xtract_tristimulus_3(float *data, int N, void *argv, float *result){ + + int n = N; + + float den, num; + + while(n--) + den += data[n]; + + num = den - data[0] + data[1] + data[2] + data[3]; + + *result = num / den; + +} + +int xtract_smoothness(float *data, int N, void *argv, float *result){ + + int n = N; + + if (data[0] <= 0) data[0] = 1; + if (data[1] <= 0) data[1] = 1; + + for(n = 2; n < N; n++){ + if(data[n] <= 0) data[n] = 1; + *result += abs(20 * log(data[n-1]) - (20 * log(data[n-2]) + + 20 * log(data[n-1]) + 20 * log(data[n])) / 3); + } +} + +int xtract_spread(float *data, int N, void *argv, float *result){ + + int n = N; + + float num, den, tmp; + + while(n--){ + tmp = n - *(float *)argv; + num += SQ(tmp) * data[n]; + den += data[n]; + } + + *result = sqrt(num / den); + +} + +int xtract_zcr(float *data, int N, void *argv, float *result){ + + int n = N; + + for(n = 1; n < N; n++) + if(data[n] * data[n-1] < 0) (*result)++; + + *result /= N; + +} + +int xtract_rolloff(float *data, int N, void *argv, float *result){ + + int n = N; + float pivot, temp; + + while(n--) pivot += data[n]; + + pivot *= *(float *)argv; + + for(n = 0; temp < pivot; temp += data[n++]); + + *result = n; + +} + +int xtract_loudness(float *data, int N, void *argv, float *result){ + + int n = BARK_BANDS; + + /*if(n != N) return BAD_VECTOR_SIZE; */ + + while(n--) + *result += pow(data[n], 0.23); +} + + +int xtract_flatness(float *data, int N, void *argv, float *result){ + + int n = N; + + float num, den; + + while(n--){ + if(data[n] !=0){ + num *= data[n]; + den += data[n]; + } + } + + num = pow(num, 1 / N); + den /= N; + + *result = 10 * log10(num / den); + +} + +int xtract_tonality(float *data, int N, void *argv, float *result){ + + float sfmdb, sfm; + + sfm = *(float *)argv; + + sfmdb = (sfm > 0 ? (10 * log10(sfm)) / -60 : 0); + + *result = MIN(sfmdb, 1); + +} + +int xtract_crest(float *data, int N, void *argv, float *result){ + + NOT_IMPLEMENTED; + +} + +int xtract_noisiness(float *data, int N, void *argv, float *result){ + + NOT_IMPLEMENTED; + +} +int xtract_rms_amplitude(float *data, int N, void *argv, float *result){ + + int n = N; + + while(n--) *result += SQ(data[n]); + + *result = sqrt(*result / N); + +} + +int xtract_inharmonicity(float *data, int N, void *argv, float *result){ + + int n = N; + float num, den, + *fund, *freq; + + fund = *(float **)argv; + freq = fund+1; + + while(n--){ + num += abs(freq[n] - n * *fund) * SQ(data[n]); + den += SQ(data[n]); + } + + *result = (2 * num) / (*fund * den); + +} + + +int xtract_power(float *data, int N, void *argv, float *result){ + + NOT_IMPLEMENTED; + +} + +int xtract_odd_even_ratio(float *data, int N, void *argv, float *result){ + + int n = N >> 1, j, k; + + float num, den; + + while(n--){ + j = n * 2; + k = j - 1; + num += data[k]; + den += data[j]; + } + + *result = num / den; + +} + +int xtract_sharpness(float *data, int N, void *argv, float *result){ + + NOT_IMPLEMENTED; + +} + +int xtract_slope(float *data, int N, void *argv, float *result){ + + NOT_IMPLEMENTED; + +} + +int xtract_f0(float *data, int N, void *argv, float *result){ + +/* int n, M = N >> 1; + float guess, error, minimum_error = 1000000, f0, freq; + + guess = *(float *)argv; + + for(n = 0; n < M; n++){ + if(freq = data[n]){ + error = abs(guess - freq); + if(error < minimum_error){ + f0 = freq; + minimum_error = error; + } + } + } + *result = f0;*/ + + + float f0 = SR_LIMIT; + int n = N; + + while(n--) { + if(data[n] > 0) + f0 = MIN(f0, data[n]); + } + + *result = (f0 == SR_LIMIT ? 0 : f0); + +} + +int xtract_hps(float *data, int N, void *argv, float *result){ + + int n = N, M, m, l, peak_index, position1_lwr; + float *coeffs2, *coeffs3, *product, L, + largest1_lwr, peak, ratio1; + + coeffs2 = (float *)malloc(N * sizeof(float)); + coeffs3 = (float *)malloc(N * sizeof(float)); + product = (float *)malloc(N * sizeof(float)); + + while(n--) coeffs2[n] = coeffs3[n] = 1; + + M = N >> 1; + L = N / 3; + + while(M--){ + m = M << 1; + coeffs2[M] = (data[m] + data[m+1]) * 0.5f; + + if(M < L){ + l = M * 3; + coeffs3[M] = (data[l] + data[l+1] + data[l+2]) / 3; + } + } + + peak_index = peak = 0; + + for(n = 1; n < N; n++){ + product[n] = data[n] * coeffs2[n] * coeffs3[n]; + if(product[n] > peak){ + peak_index = n; + peak = product[n]; + } + } + + largest1_lwr = position1_lwr = 0; + + for(n = 0; n < N; n++){ + if(data[n] > largest1_lwr && n != peak_index){ + largest1_lwr = data[n]; + position1_lwr = n; + } + } + + ratio1 = data[position1_lwr] / data[peak_index]; + + if(position1_lwr > peak_index * 0.4 && position1_lwr < + peak_index * 0.6 && ratio1 > 0.1) + peak_index = position1_lwr; + + *result = 22050 * (float)peak_index / (float)N; + + free(coeffs2); + free(coeffs3); + free(product); + +} + diff --git a/src/vector.c b/src/vector.c new file mode 100644 index 0000000..cb64110 --- /dev/null +++ b/src/vector.c @@ -0,0 +1,228 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + + +/* xtract_vector.c: defines functions that extract a feature as a single value from an input vector */ + +#include "xtract/libxtract.h" +#include +#include + +int xtract_magnitude_spectrum(float *data, int N, void *argv, float *result){ + + float *temp; + int n , M = N >> 1; + fftwf_plan plan; + + temp = (float *)fftwf_malloc(N * sizeof(float)); + + plan = fftwf_plan_r2r_1d(N, data, temp, FFTW_R2HC, FFTW_ESTIMATE); + + fftwf_execute(plan); + + for(n = 1; n < M; n++){ + result[n] = sqrt(SQ(temp[n]) + SQ(temp[N - n])) / N; + result[N-n] = 0.0f; + } + + result[0] = fabs(temp[0]) / N; + result[M] = fabs(temp[M]) / N; + + fftwf_destroy_plan(plan); + fftwf_free(temp); + +} + +int xtract_autocorrelation(float *data, int N, void *argv, float *result){ + + /* Naive time domain implementation */ + + int n = N, i; + + float corr; + + while(n--){ + corr = 0; + for(i = 0; i < N - n; i++){ + corr += data[i] * data[i + n]; + } + result[n] = corr / N; + } +} + +int xtract_autocorrelation_fft(float *data, int N, void *argv, float *result){ + + float *temp; + int n; + fftwf_plan plan; + + temp = (float *)fftwf_malloc(N * sizeof(float)); + plan = fftwf_plan_r2r_1d(N, data, temp, FFTW_HC2R, FFTW_ESTIMATE); + + fftwf_execute(plan); + + for(n = 0; n < N - 1; n++) + result[n] = temp[n+1]; + + fftwf_destroy_plan(plan); + fftwf_free(temp); +} + +int xtract_amdf(float *data, int N, void *argv, float *result){ + + int n = N, i; + + float md; + + while(n--){ + md = 0; + for(i = 0; i < N - n; i++){ + md += abs(data[i] - data[i + n]); + } + result[n] = md / N; + } +} + +int xtract_asdf(float *data, int N, void *argv, float *result){ + + int n = N, i; + + float sd; + + while(n--){ + sd = 0; + for(i = 0; i < N - n; i++){ + sd = 1; + sd += SQ(data[i] - data[i + n]); + } + result[n] = sd / N; + } +} + +int xtract_mfcc(float *data, int N, void *argv, float *result){ + + xtract_mel_filter *f; + int n, filter; + fftwf_plan plan; + + f = (xtract_mel_filter *)argv; + + for(filter = 0; filter < f->n_filters; filter++){ + for(n = 0; n < N; n++){ + result[filter] += data[n] * f->filters[filter][n]; + } + if(result[filter] < LOG_LIMIT) result[filter] = LOG_LIMIT; + result[filter] = log(result[filter]); + } + + for(n = filter + 1; n < N; n++) result[n] = 0; + + xtract_dct(result, f->n_filters, NULL, result); + +} + +int xtract_dct(float *data, int N, void *argv, float *result){ + + fftwf_plan plan; + + plan = + fftwf_plan_r2r_1d(N, data, result, FFTW_REDFT00, FFTW_ESTIMATE); + + fftwf_execute(plan); + fftwf_destroy_plan(plan); +} + +int xtract_bark_coefficients(float *data, int N, void *argv, float *result){ + + int *limits, band, n; + + limits = (int *)argv; + + for(band = 0; band < BARK_BANDS; band++){ + for(n = limits[band]; n < limits[band + 1]; n++) + result[band] += data[n]; + } +} + +int xtract_peaks(float *data, int N, void *argv, float *result){ + + float thresh, max, y, y2, y3, p, width, sr; + int n = N, M, return_code; + + if(argv != NULL){ + thresh = ((float *)argv)[0]; + sr = ((float *)argv)[1]; + return_code = BAD_ARGV; + } + else{ + thresh = 0; + sr = 44100; + } + + M = N >> 1; + width = sr / N; + + y = y2 = y3 = p = max = 0; + + if(thresh < 0 || thresh > 100){ + thresh = 0; + return_code = BAD_ARGV; + } + + if(!sr){ + sr = 44100; + return_code = BAD_ARGV; + } + + while(n--){ + max = MAX(max, data[n]); + /* ensure we never take log10(0) */ + /*data[n] = (data[n] < LOG_LIMIT ? LOG_LIMIT : data[n]);*/ + if ((data[n] * 100000) <= 1) + /* We get a more stable peak this way */ + data[n] = 1; + + } + + thresh *= .01 * max; + + result[0] = 0; + result[M] = 0; + + for(n = 1; n < M; n++){ + if(data[n] >= thresh){ + if(data[n] > data[n - 1] && data[n] > data[n + 1]){ + result[n] = width * (n + (p = .5 * (y = 20 * log10(data[n-1]) - (y3 = 20 * log10(data[n+1]))) / (20 * log10(data[n - 1]) - 2 * (y2 = 20 * log10(data[n])) + 20 * log10(data[n + 1])))); + result[M + n] = y2 - .25 * (y - y3) * p; + } + else{ + result[n] = 0; + result[M + n] = 0; + } + } + else{ + result[n] = 0; + result[M + n] = 0; + } + } + + return (return_code ? return_code : SUCCESS); +} + diff --git a/xtract/Makefile.am b/xtract/Makefile.am new file mode 100644 index 0000000..b29e60d --- /dev/null +++ b/xtract/Makefile.am @@ -0,0 +1,5 @@ +libxtractdir = $(includedir)/xtract + +libxtract_HEADERS = libxtract.h xtract_macros.h xtract_types.h xtract_delta.h \ + xtract_scalar.h xtract_vector.h + diff --git a/xtract/libxtract.h b/xtract/libxtract.h new file mode 100644 index 0000000..960aa66 --- /dev/null +++ b/xtract/libxtract.h @@ -0,0 +1,182 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +#ifndef XTRACT_H +#define XTRACT_H + +#ifdef __cplusplus +extern "C" { +#endif + +/** + * \file libxtract.h: main header file and API definition + */ + +#define VERSION "0.1" + + +#include "xtract_scalar.h" +#include "xtract_vector.h" +#include "xtract_delta.h" +#include "xtract_types.h" +#include "xtract_macros.h" + +#define XTRACT_FEATURES 40 +#define LOG_LIMIT 10e-10 +#define SR_LIMIT 192000 +#define BARK_BANDS 26 + +/** \brief Enumeration of features, elements are used as indixes to an array of pointers to feature extracton functions */ + +enum features_ { + MEAN, + VARIANCE, + STANDARD_DEVIATION, + AVERAGE_DEVIATION, + SKEWNESS, + KURTOSIS, + IRREGULARITY_K, + IRREGULARITY_J, + TRISTIMULUS_1, + TRISTIMULUS_2, + TRISTIMULUS_3, + SMOOTHNESS, + SPREAD, + ZCR, + ROLLOFF, + LOUDNESS, + FLATNESS, + TONALITY, + CREST, + NOISINESS, + RMS_AMPLITUDE, + INHARMONICITY, + POWER, + ODD_EVEN_RATIO, + SHARPNESS, + SLOPE, + F0, + HPS, + MAGNITUDE_SPECTRUM, + AUTOCORRELATION, + AUTOCORRELATION_FFT, + AMDF, + ASDF, + MFCC, + DCT, + BARK_COEFFICIENTS, + PEAKS, + FLUX, + ATTACK_TIME, + DECAY_TIME, + DELTA_FEATURE +}; + +/** \brief Enumeration of feature types */ + +enum feature_types_ { + SCALAR, + VECTOR, + DELTA +}; + +/** \brief Enumeration of mfcc types */ + +enum mfcc_types_ { + EQUAL_GAIN, + EQUAL_AREA +}; + +/** \brief Enumeration of return codes */ + +enum return_codes_ { + SUCCESS, + MALLOC_FAILED, + BAD_ARGV, + BAD_VECTOR_SIZE +}; + +/** + * + * \brief Perform feature extraction + * + * \param + * + * In general functions in this library conform to the following prototpe: + * + * int xtract_featurename(float *data, int N, void *argv, float *result) + * + * + * float *data: a pointer to an array element + * + * int N: the number of elements to be processed by the function + * + * void *argv: an abitrary number of additional arguments + * + * float *result: a pointer to the result + * + * + * Each function will iterate over N array elements, the first of which is + * pointed to by *data. It is therefore up to the caller to ensure that an + * approriate range of data is provided. For example, if the function expects + * an array containing an harmonic spectrum, then they array pointed to by + * *data must contain the amplitudes of harmonic frequencies in adjacent + * elemets + * + * For scalar and delta features, *result will point to a single value. + * + * For vector features it will point to the first element in an array. + * + * Memory for this array must be allocated and freed by the calling + * function. + * + * All functions return an integer error code as descibed in the enumeration + * return_codes_ + * + * */ + + +int(*xtract[XTRACT_FEATURES])(float *, int, void *, float *); + +/* Data structures */ + +typedef struct xtract_mel_filter_ { + int n_filters; + float **filters; +} xtract_mel_filter; + + +/* Initialisation functions */ +/* xtract_init_mfcc */ +/* It is up to the caller to pass in a pointer to memory allocated for freq_bands arrays of length N. This function populates these arrays with magnitude coefficients representing the mel filterbank on a linear scale */ +int xtract_init_mfcc(int N, float nyquist, int style, float freq_max, float freq_min, int freq_bands, float **fft_tables); + +/* xtract_init_bark */ +/* A pointer to an array of BARK_BANDS ints most be passed in, and is populated with BARK_BANDS fft bin numbers representing the limits of each band */ +int xtract_init_bark(int N, float nyquist, int *band_limits); + + +/* Free functions */ + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/xtract/xtract_delta.h b/xtract/xtract_delta.h new file mode 100644 index 0000000..68f18a4 --- /dev/null +++ b/xtract/xtract_delta.h @@ -0,0 +1,61 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +/* xtract_delta.h: declares functions that extract a feature as a single value from more than one input vector */ + +#ifndef XTRACT_DELTA +#define XTRACT_DELTA + +#ifdef __cplusplus +extern "C" { +#endif + +#include "xtract_types.h" +/* Flux/temporal variation */ + +/* Gaël Richard (2006)*/ +int xtract_flux(float *data, int N, void *argv , float *result); +/*xtract_frame_tracker *xf */ + +/* Attack Time */ + +int xtract_attack_time(float *data, int N, void *argv , float *result); +/* xtract_amp_tracker *xa */ + +/* Temporal decrease */ + +int xtract_decay_time(float *data, int N, void *argv, float *result); +/* xtract_amp_tracker *xa */ + + +/* Delta vector */ +/* Generic function to calculate the delta of a feature over a given period (in frames */ + +int xtract_delta_feature(float *data, int N, void *argv, float *result); +/*xtract_frame_tracker *xf */ +/*float frames*/ + + + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/xtract/xtract_macros.h b/xtract/xtract_macros.h new file mode 100644 index 0000000..d225db2 --- /dev/null +++ b/xtract/xtract_macros.h @@ -0,0 +1,41 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + + + +/* xtract_delta.h: defines useful macros */ + +#ifndef XTRACT_MACROS +#define XTRACT_MACROS + +#ifdef __cplusplus +extern "C" { +#endif + +#define SQ(a) ((a) * (a)) +#define MIN(a, b) ((a) < (b) ? (a) : (b)) +#define MAX(a, b) ((a) > (b) ? (a) : (b)) +#define NOT_IMPLEMENTED printf("Feature not implemented yet.\n") + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/xtract/xtract_scalar.h b/xtract/xtract_scalar.h new file mode 100644 index 0000000..d0d780b --- /dev/null +++ b/xtract/xtract_scalar.h @@ -0,0 +1,144 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +/* xtract_scalar.h: declares functions that extract a feature as a single value from an input vector */ + +#ifndef XTRACT_SCALAR +#define XTRACT_SCALAR + +#ifdef __cplusplus +extern "C" { +#endif + + +/* Statistical features */ + +int xtract_mean(float *data, int N, void *argv, float *result); +/* mean is passed in as arg */ +int xtract_variance(float *data, int N, void *argv, float *result); +/* variance is passed in as arg */ +int xtract_standard_deviation(float *data, int N, void *argv, float *result); +/* mean is passed in as arg */ +int xtract_average_deviation(float *data, int N, void *argv, float *result); +/* mean and standard deviation are passed in as arg */ +int xtract_skewness(float *data, int N, void *argv, float *result); +/* mean and standard deviation are passed in as arg */ +int xtract_kurtosis(float *data, int N, void *argv, float *result); + +/* Irregularity */ + +/* Krimphoff (1994) */ +int xtract_irregularity_k(float *data, int N, void *argv, float *result); +/* Jensen (1999) */ +int xtract_irregularity_j(float *data, int N, void *argv, float *result); + +/* Tristimulus */ + +/* Pollard and Jansson (1982) */ +int xtract_tristimulus_1(float *data, int N, void *argv, float *result); +int xtract_tristimulus_2(float *data, int N, void *argv, float *result); +int xtract_tristimulus_3(float *data, int N, void *argv, float *result); + +/* Smoothness */ + +/*McAdams (1999)*/ +int xtract_smoothness(float *data, int N, void *argv, float *result); + +/* Spectral Spread */ + +/* Casagrande 2005 */ + +int xtract_spread(float *data, int N, void *argv, float *result); + +/* Zero crossing rate */ + +int xtract_zcr(float *data, int N, void *argv, float *result); + +/* Rolloff */ + +/* Bee Suan Ong (2005) */ +/* Threshold is the percentile at which the rolloff is determined */ + +int xtract_rolloff(float *data, int N, void *argv, float *result); + +/* Loudness */ +/* A set of BARK_BANDS bark coefficients must be passed in, the loudness is calculated approximately according to Moore, Glasberg et al, 1997 */ + +int xtract_loudness(float *data, int N, void *argv, float *result); + +/* Spectral Flatness Measure */ +/* Tristan Jehan (2005) */ + +int xtract_flatness(float *data, int N, void *argv, float *result); + +/* Tonality Factor */ +/* Tristan Jehan (2005) */ + +int xtract_tonality(float *data, int N, void *argv, float *result); + +/* Noisiness */ +/* Tae Hong Park (2000) */ + +int xtract_noisiness(float *data, int N, void *argv, float *result); + +/* RMS amplitude */ +/* Tae Hong Park (2000) */ + +int xtract_rms_amplitude(float *data, int N, void *argv, float *result); + +/* Inharmonicity */ + +int xtract_inharmonicity(float *data, int N, void *argv, float *result); + +/* Spectral Crest */ +/* Peeters (2003) */ +int xtract_crest(float *data, int N, void *argv, float *result); + +/* Spectral Power */ +/* Bee Suan Ong (2005) */ +int xtract_power(float *data, int N, void *argv, float *result); + +/* Odd to even harmonic ratio */ + +int xtract_odd_even_ratio(float *data, int N, void *argv, float *result); + +/* Sharpness */ + +int xtract_sharpness(float *data, int N, void *argv, float *result); + +/* Slope */ +int xtract_slope(float *data, int N, void *argv, float *result); + +/* F0 */ +/*This method takes a guess which can come from taking the ZCR of an autocorrelation function, and then finds the spectral peak that most closely matches the gess */ +int xtract_f0(float *data, int N, void *argv, float *result); + +/* Pitch */ +/* Pitch via HPS analysis */ +int xtract_hps(float *data, int N, void *argv, float *result); + +#ifdef __cplusplus +} +#endif + +#endif + + + diff --git a/xtract/xtract_types.h b/xtract/xtract_types.h new file mode 100644 index 0000000..39fce64 --- /dev/null +++ b/xtract/xtract_types.h @@ -0,0 +1,46 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +/* xtract_types.h: declares specialised variable types used by libxtract */ + +#ifndef XTRACT_TYPES +#define XTRACT_TYPES + +#ifdef __cplusplus +extern "C" { +#endif + +/* Data structure used to store amplitude data between calls to xtract_attack_time and other functions. */ + +typedef struct _xtract_amp_tracker { + int count; + float previous_amp; +} xtract_amp_tracker; + +typedef struct _xtract_frame_tracker { + int frame_count; + float *previous_frame; +} xtract_frame_tracker; + +#ifdef __cplusplus +} +#endif + +#endif diff --git a/xtract/xtract_vector.h b/xtract/xtract_vector.h new file mode 100644 index 0000000..16a6cc3 --- /dev/null +++ b/xtract/xtract_vector.h @@ -0,0 +1,65 @@ +/* libxtract feature extraction library + * + * Copyright (C) 2006 Jamie Bullock + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, + * USA. + */ + +/* xtract_scalar.h: declares functions that extract a feature as a vector from an input vector */ + +#ifndef XTRACT_VECTOR +#define XTRACT_VECTOR + +#ifdef __cplusplus +extern "C" { +#endif + +/* Extracts normalized (0-1) frequency domain magnitude spectrum from time domain signal */ +int xtract_magnitude_spectrum(float *data, int N, void *argv, float *result); + + +/* Autocorrelation */ +int xtract_autocorrelation(float *data, int N, void *argv, float *result); + + +int xtract_autocorrelation_fft(float *data, int N, void *argv, float *result); + +/* Average Magnitude Difference Function */ +int xtract_amdf(float *data, int N, void *argv, float *result); + +/* Average Squared Difference Function */ +int xtract_asdf(float *data, int N, void *argv, float *result); + +/* MFCC */ +/* Rabiner */ +int xtract_mfcc(float *data, int N, void *argv, float *result); + +/* Bark band */ + +int xtract_bark_coefficients(float *data, int N, void *argv, float *result); + +/* Discrete cosine transform */ +int xtract_dct(float *data, int N, void *argv, float *result); + +/* Frequency and amplitude of spectral peaks */ +/* Takes peak threshold as percentage below max peak, and sr as argv, returns a pointer to an array of size N, containing N/2 freqs and N/2 amplitudes, amplitudes are on a decibel scale with dbFS = 0 */ +int xtract_peaks(float *data, int N, void *argv, float *result); + +#ifdef __cplusplus +} +#endif + +#endif -- cgit v1.2.3