Added editor for automated chopping up of audiofiles into samples.

1 files changed, 153 insertions, 0 deletions

diff --git a/dgedit/audioextractor.cc b/dgedit/audioextractor.cc
new file mode 100644
index 0000000..bde661a
--- /dev/null
+++ b/dgedit/audioextractor.cc
@@ -0,0 +1,153 @@
+/* -*- 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(QString p)
+{
+  prefix = p;
+}
+
+void AudioExtractor::setExportPath(QString path)
+{
+  exportpath = path;
+}
+