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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* powerlist.cc
*
* Sun Jul 28 19:45:48 CEST 2013
* Copyright 2013 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 "powerlist.h"
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <hugin.hpp>
// Enable to calculate power on old samples without power attribute
//#define AUTO_CALCULATE_POWER
#define SIZE 500
// Box–Muller transform.
// See: http://en.wikipedia.org/wiki/Box%E2%80%93Muller_transform
static float box_muller_transform(float mean, float stddev)
{
float U1 = (float)rand() / (float)RAND_MAX;
float U2 = (float)rand() / (float)RAND_MAX;
float x = sqrt(-2.0 * log(U1)) * cos(2.0 * M_PI * U2);
return mean + stddev * x;
}
PowerList::PowerList()
{
power_max = 0;
}
#define THRES 1.0
void PowerList::add(Sample *sample)
{
PowerListItem item;
item.power = -1;
item.sample = sample;
samples.push_back(item);
}
Channel *PowerList::getMasterChannel()
{
std::map<Channel *, int> count;
std::vector<PowerListItem>::iterator si = samples.begin();
while(si != samples.end()) {
PowerListItem &item = *si;
Sample *sample = item.sample;
Channel *max_channel = NULL;
sample_t max_val = 0;
// DEBUG(rand, "Sample: %s\n", sample->name.c_str());
size_t ci = 0;
AudioFiles::iterator ai = sample->audiofiles.begin();
while(ai != sample->audiofiles.end()) {
Channel *c = ai->first;
AudioFile *af = ai->second;
af->load(SIZE);
float silence = 0;
size_t silence_length = 4;
for(size_t s = af->size; s > 0 && s > af->size - silence_length; s--) {
silence += af->data[s];
}
silence /= silence_length;
size_t s = 0;
for(; s < af->size; s++) {
float val = af->data[s] * af->data[s] * (1.0 / (float)(s+1));
if(val > max_val) {
max_val = val;
max_channel = c;
break;
}
}
af->unload();
ai++;
ci++;
}
if(max_channel) {
if(count.find(max_channel) == count.end()) count[max_channel] = 0;
count[max_channel]++;
}
si++;
}
Channel *master = NULL;
int max_count = -1;
std::map<Channel *, int>::iterator ci = count.begin();
while(ci != count.end()) {
if(ci->second > max_count &&
strstr(ci->first->name.c_str(), "Alesis") == 0) {
master = ci->first;
max_count = ci->second;
}
ci++;
}
return master;
}
void PowerList::finalise()
{
#ifdef AUTO_CALCULATE_POWER
Channel *master_channel = getMasterChannel();
if(master_channel == NULL) {
ERR(rand, "No master channel found!\n");
return; // This should not happen...
}
DEBUG(rand, "Master channel: %s\n", master_channel->name.c_str());
#endif/*AUTO_CALCULATE_POWER*/
std::vector<PowerListItem>::iterator si = samples.begin();
while(si != samples.end()) {
PowerListItem &item = *si;
Sample *sample = item.sample;
#ifdef AUTO_CALCULATE_POWER
DEBUG(rand, "Sample: %s\n", sample->name.c_str());
AudioFile *master = NULL;
AudioFiles::iterator afi = sample->audiofiles.begin();
while(afi != sample->audiofiles.end()) {
if(afi->first->name == master_channel->name) {
master = afi->second;
break;
}
afi++;
}
if(master == NULL) {
si++;
continue;
}
master->load();
#endif/*AUTO_CALCULATE_POWER*/
#ifdef AUTO_CALCULATE_POWER
if(sample->power == -1) { // Power not defined. Calculate it!
DEBUG(powerlist, "Calculating power\n");
float power = 0;
size_t s = 0;
for(; s < SIZE && s < master->size; s++) {
power += master->data[s] * master->data[s];
}
power = sqrt(power);
sample->power = power;
}
#endif/*AUTO_CALCULATE_POWER*/
item.power = sample->power;
if(item.power > power_max) power_max = item.power;
DEBUG(rand, " - power: %f\n", item.power);
si++;
}
}
Sample *PowerList::get(level_t level)
{
Sample *sample = NULL;
float power = 0;
float mean = level * power_max;
float stddev = power_max / samples.size() * 1.5;
float lvl = box_muller_transform(mean, stddev);
DEBUG(rand, "level: %f, lvl: %f (mean: %.2f, stddev: %.2f)\n",
level, lvl, mean, stddev);
std::vector<PowerListItem>::iterator i = samples.begin();
while(i != samples.end()) {
if(sample == NULL) {
sample = i->sample;
power = i->power;
}
if(fabs(i->power - lvl) < fabs(power - lvl)) {
sample = i->sample;
power = i->power;
}
i++;
}
DEBUG(rand, "Found power %f\n", power);
return sample;
}
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