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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* audioextractor.cc
*
* Sat Nov 21 13:09:35 CET 2009
* Copyright 2009 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo 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.
*
* DrumGizmo 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 DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "audioextractor.h"
#include <sndfile.h>
AudioExtractor::AudioExtractor(QObject *parent)
: QObject(parent)
{
}
float *AudioExtractor::load(QString file, size_t *size)
{
float *data;
SF_INFO sf_info;
SNDFILE *fh = sf_open(file.toStdString().c_str(), SFM_READ, &sf_info);
if(!fh) {
printf("Load error...\n");
*size = 0;
return NULL;
}
*size = sf_seek(fh, 0, SEEK_END);
data = new float[*size];
sf_seek(fh, 0, SEEK_SET);
sf_read_float(fh, data, *size);
sf_close(fh);
return data;
}
void AudioExtractor::exportSelection(QString name,
int index,
float *data, size_t size,
Selection sel)
{
QString file = exportpath + "/" + prefix + "-" + name + "-" + QString::number(index) + ".wav";
printf("Writing: %s (sz: %d, from %d to %d)\n",
file.toStdString().c_str(), size, sel.from, sel.to);
if(sel.from > (int)size || sel.to > (int)size || sel.to < 0 || sel.from < 0 || sel.to < sel.from) {
printf("Out of bounds\n");
return;
}
// Apply linear fadein
for(int i = 0; i < sel.fadein; i++) {
float val = ((float)i / (float)sel.fadein);
data[i + sel.from] *= val;
}
// Apply fadeout
for(int i = 0; i < sel.fadeout; i++) {
float val = ((float)i / (float)sel.fadeout);
data[sel.to - i] *= val;
}
SF_INFO sf_info;
sf_info.format = SF_FORMAT_WAV | SF_FORMAT_FLOAT;
sf_info.samplerate = 44100;
sf_info.channels = 1;
SNDFILE *fh = sf_open(file.toStdString().c_str(), SFM_WRITE, &sf_info);
if(!fh) {
printf("Open for write error...\n");
return;
}
sf_write_float(fh, data + sel.from, sel.to - sel.from);
sf_close(fh);
}
void AudioExtractor::exportSelections(Selections selections)
{
QVector< QPair<QString, QString> >::iterator j = audiofiles.begin();
while(j != audiofiles.end()) {
QString file = j->first;
QString name = j->second;
size_t size;
float *data = load(file, &size);
if(!data) continue;
int index = 0;
QMap<int, Selection>::iterator i = selections.begin();
while(i != selections.end()) {
exportSelection(name, ++index, data, size, i.value());
i++;
}
delete[] data;
j++;
}
}
void AudioExtractor::addFile(QString file, QString name)
{
QPair<QString, QString> pair;
pair.first = file;
pair.second = name;
audiofiles.push_back(pair);
}
void AudioExtractor::removeFile(QString file)
{
QVector< QPair<QString, QString> >::iterator j = audiofiles.begin();
while(j != audiofiles.end()) {
if(file == j->first) {
audiofiles.erase(j);
return;
}
j++;
}
}
void AudioExtractor::setOutputPrefix(const QString &p)
{
prefix = p;
}
void AudioExtractor::setExportPath(const QString &path)
{
exportpath = path;
}
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