ref: e99242a33df6cf2194cf4411475a194597f8a439
dir: /src/spectral/phasevoc.c/
/* Copyright (C) 2003-2014 Paul Brossier <piem@aubio.org> This file is part of aubio. aubio 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 3 of the License, or (at your option) any later version. aubio 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 aubio. If not, see <http://www.gnu.org/licenses/>. */ #include "aubio_priv.h" #include "fvec.h" #include "cvec.h" #include "mathutils.h" #include "spectral/fft.h" #include "spectral/phasevoc.h" /** phasevocoder internal object */ struct _aubio_pvoc_t { uint_t win_s; /** grain length */ uint_t hop_s; /** overlap step */ aubio_fft_t * fft; /** fft object */ fvec_t * data; /** current input grain, [win_s] frames */ fvec_t * dataold; /** memory of past grain, [win_s-hop_s] frames */ fvec_t * synth; /** current output grain, [win_s] frames */ fvec_t * synthold; /** memory of past grain, [win_s-hop_s] frames */ fvec_t * w; /** grain window [win_s] */ uint_t start; /** where to start additive synthesis */ uint_t end; /** where to end it */ smpl_t scale; /** scaling factor for synthesis */ uint_t end_datasize; /** size of memory to end */ uint_t hop_datasize; /** size of memory to hop_s */ }; /** returns data and dataold slided by hop_s */ static void aubio_pvoc_swapbuffers(aubio_pvoc_t *pv, const fvec_t *new); /** do additive synthesis from 'old' and 'cur' */ static void aubio_pvoc_addsynth(aubio_pvoc_t *pv, fvec_t * synthnew); void aubio_pvoc_do(aubio_pvoc_t *pv, const fvec_t * datanew, cvec_t *fftgrain) { /* slide */ aubio_pvoc_swapbuffers(pv, datanew); /* windowing */ fvec_weight(pv->data, pv->w); /* shift */ fvec_shift(pv->data); /* calculate fft */ aubio_fft_do (pv->fft,pv->data,fftgrain); } void aubio_pvoc_rdo(aubio_pvoc_t *pv,cvec_t * fftgrain, fvec_t * synthnew) { /* calculate rfft */ aubio_fft_rdo(pv->fft,fftgrain,pv->synth); /* unshift */ fvec_ishift(pv->synth); /* windowing */ // if overlap = 50%, do not apply window (identity) if (pv->hop_s * 2 < pv->win_s) { fvec_weight(pv->synth, pv->w); } /* additive synthesis */ aubio_pvoc_addsynth(pv, synthnew); } aubio_pvoc_t * new_aubio_pvoc (uint_t win_s, uint_t hop_s) { aubio_pvoc_t * pv = AUBIO_NEW(aubio_pvoc_t); /* if (win_s < 2*hop_s) { AUBIO_WRN("Hop size bigger than half the window size!\n"); } */ if ((sint_t)hop_s < 1) { AUBIO_ERR("pvoc: got hop_size %d, but can not be < 1\n", hop_s); goto beach; } else if ((sint_t)win_s < 2) { AUBIO_ERR("pvoc: got buffer_size %d, but can not be < 2\n", win_s); goto beach; } else if (win_s < hop_s) { AUBIO_ERR("pvoc: hop size (%d) is larger than win size (%d)\n", win_s, hop_s); goto beach; } pv->fft = new_aubio_fft (win_s); /* remember old */ pv->data = new_fvec (win_s); pv->synth = new_fvec (win_s); /* new input output */ if (win_s > hop_s) { pv->dataold = new_fvec (win_s-hop_s); pv->synthold = new_fvec (win_s-hop_s); } else { pv->dataold = new_fvec (1); pv->synthold = new_fvec (1); } pv->w = new_aubio_window ("hanningz", win_s); pv->hop_s = hop_s; pv->win_s = win_s; /* more than 50% overlap, overlap anyway */ if (win_s < 2 * hop_s) pv->start = 0; /* less than 50% overlap, reset latest grain trail */ else pv->start = win_s - hop_s - hop_s; if (win_s > hop_s) pv->end = win_s - hop_s; else pv->end = 0; pv->end_datasize = pv->end * sizeof(smpl_t); pv->hop_datasize = pv->hop_s * sizeof(smpl_t); // for reconstruction with 75% overlap if (win_s == hop_s * 4) { pv->scale = 2./3.; } else if (win_s == hop_s * 8) { pv->scale = 1./3.; } else if (win_s == hop_s * 2) { pv->scale = 1.; } else { pv->scale = .5; } return pv; beach: AUBIO_FREE (pv); return NULL; } void del_aubio_pvoc(aubio_pvoc_t *pv) { del_fvec(pv->data); del_fvec(pv->synth); del_fvec(pv->dataold); del_fvec(pv->synthold); del_fvec(pv->w); del_aubio_fft(pv->fft); AUBIO_FREE(pv); } static void aubio_pvoc_swapbuffers(aubio_pvoc_t *pv, const fvec_t *new) { /* some convenience pointers */ smpl_t * data = pv->data->data; smpl_t * dataold = pv->dataold->data; smpl_t * datanew = new->data; #ifndef HAVE_MEMCPY_HACKS uint_t i; for (i = 0; i < pv->end; i++) data[i] = dataold[i]; for (i = 0; i < pv->hop_s; i++) data[pv->end + i] = datanew[i]; for (i = 0; i < pv->end; i++) dataold[i] = data[i + pv->hop_s]; #else memcpy(data, dataold, pv->end_datasize); data += pv->end; memcpy(data, datanew, pv->hop_datasize); data -= pv->end; data += pv->hop_s; memcpy(dataold, data, pv->end_datasize); #endif } static void aubio_pvoc_addsynth(aubio_pvoc_t *pv, fvec_t *synth_new) { uint_t i; /* some convenience pointers */ smpl_t * synth = pv->synth->data; smpl_t * synthold = pv->synthold->data; smpl_t * synthnew = synth_new->data; /* put new result in synthnew */ for (i = 0; i < pv->hop_s; i++) synthnew[i] = synth[i] * pv->scale; /* no overlap, nothing else to do */ if (pv->end == 0) return; /* add new synth to old one */ for (i = 0; i < pv->hop_s; i++) synthnew[i] += synthold[i]; /* shift synthold */ for (i = 0; i < pv->start; i++) synthold[i] = synthold[i + pv->hop_s]; /* erase last frame in synthold */ for (i = pv->start; i < pv->end; i++) synthold[i] = 0.; /* additive synth */ for (i = 0; i < pv->end; i++) synthold[i] += synth[i + pv->hop_s] * pv->scale; }