src/audiofile.cc


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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
 *            audiofile.cc
 *
 *  Tue Jul 22 17:14:11 CEST 2008
 *  Copyright 2008 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 "audiofile.h"

#include <stdlib.h>
#include <unistd.h>

#include <sndfile.h>

AudioFile::AudioFile(std::string filename, bool preload, int min_velocity)
{
  this->filename = filename;
  data = NULL;
  size = 0;

  char *p = (char*)filename.c_str() + filename.length() - 6;
  int num = atoi(p);
  if(num < 0) num *= -1;

  //printf("%s", filename.c_str());
  if(preload && num  >= min_velocity) {
    //printf(" ... loading");
    load();
  }
  printf("."); fflush(stdout);
}

AudioFile::~AudioFile()
{
  unload();
}

void AudioFile::unload()
{
  if(!data) return;

  free(data);
  data = NULL;
  size = 0;
}

#define THRESHOLD 0.0001
void AudioFile::load()
{
  if(data) return;

	SF_INFO sf_info;
	SNDFILE *fh = sf_open(filename.c_str(), SFM_READ, &sf_info);

	size = sf_seek(fh, 0, SEEK_END);
	jack_default_audio_sample_t* tmp_data = (jack_default_audio_sample_t*)malloc(sizeof(jack_default_audio_sample_t)*size);

  //	printf("Loading %s, %d samples\n", filename.c_str(), size);

	sf_seek(fh, 0, SEEK_SET);
	sf_read_float(fh, tmp_data, size); 

  //  for(size_t i = 0; i < size; i++) data[i] *= 0.1;

	sf_close(fh);

  // Find real size (crop 'silence')
  while(size > 0 && tmp_data[size--] < THRESHOLD) {}
	data = (jack_default_audio_sample_t*)malloc(sizeof(jack_default_audio_sample_t)*size);
  for(size_t i = 0; i < size; i++) data[i] = tmp_data[i];
  // ramp down
  //  if(size > 1024) for(size_t i = 1024; i >= 0; i--) data[size - i] *= (float)i/1024.0;
  free(tmp_data);

}