1 /***************************************************************************
2 * Copyright (C) 2012 by Simon Andreas Eugster (simon.eu@gmail.com) *
3 * This file is part of kdenlive. See www.kdenlive.org. *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 ***************************************************************************/
11 #include "audioEnvelope.h"
13 #include "audioStreamInfo.h"
19 AudioEnvelope::AudioEnvelope(Mlt::Producer *producer) :
22 m_envelopeSize(producer->get_length()),
23 m_envelopeStdDevCalculated(false),
24 m_envelopeIsNormalized(false)
26 m_info = new AudioInfo(m_producer);
29 AudioEnvelope::~AudioEnvelope()
31 if (m_envelope != NULL) {
39 const int64_t *AudioEnvelope::envelope()
41 if (m_envelope == NULL) {
46 int AudioEnvelope::envelopeSize() const
48 return m_envelopeSize;
54 void AudioEnvelope::loadEnvelope()
56 Q_ASSERT(m_envelope == NULL);
58 std::cout << "Loading envelope ..." << std::endl;
60 int samplingRate = m_info->info(0)->samplingRate();
61 mlt_audio_format format_s16 = mlt_audio_s16;
68 m_envelope = new int64_t[m_envelopeSize];
74 for (int i = 0; i < m_envelopeSize; i++) {
76 frame = m_producer->get_frame(i);
77 position = mlt_frame_get_position(frame->get_frame());
78 samples = mlt_sample_calculator(m_producer->get_fps(), samplingRate, position);
80 int16_t *data = static_cast<int16_t*>(frame->get_audio(format_s16, samplingRate, channels, samples));
83 for (int k = 0; k < samples; k++) {
88 m_envelopeMean += sum;
89 if (sum > m_envelopeMax) {
93 m_envelopeMean /= m_envelopeSize;
94 std::cout << "Calculating the envelope (" << m_envelopeSize << " frames) took "
95 << t.elapsed() << " ms." << std::endl;
98 int64_t AudioEnvelope::loadStdDev()
100 if (m_envelopeStdDevCalculated) {
101 std::cout << "Standard deviation already calculated, not re-calculating." << std::endl;
104 if (m_envelope == NULL) {
108 m_envelopeStdDev = 0;
109 for (int i = 0; i < m_envelopeSize; i++) {
110 m_envelopeStdDev += sqrt((m_envelope[i]-m_envelopeMean)*(m_envelope[i]-m_envelopeMean)/m_envelopeSize);
112 m_envelopeStdDevCalculated = true;
115 return m_envelopeStdDev;
118 void AudioEnvelope::normalizeEnvelope(bool clampTo0)
120 if (m_envelope == NULL) {
124 if (!m_envelopeIsNormalized) {
128 for (int i = 0; i < m_envelopeSize; i++) {
130 m_envelope[i] -= m_envelopeMean;
133 if (m_envelope[i] < 0) { m_envelope[i] = 0; }
136 if (m_envelope[i] > m_envelopeMax) {
137 m_envelopeMax = m_envelope[i];
140 newMean += m_envelope[i];
142 m_envelopeMean = newMean / m_envelopeSize;
144 m_envelopeIsNormalized = true;
149 QImage AudioEnvelope::drawEnvelope()
151 if (m_envelope == NULL) {
155 QImage img(m_envelopeSize, 400, QImage::Format_ARGB32);
156 img.fill(qRgb(255,255,255));
158 for (int x = 0; x < img.width(); x++) {
159 fy = m_envelope[x]/double(m_envelopeMax) * img.height();
160 for (int y = img.height()-1; y > img.height()-1-fy; y--) {
161 img.setPixel(x,y, qRgb(50, 50, 50));
167 void AudioEnvelope::dumpInfo() const
169 if (m_envelope == NULL) {
170 std::cout << "Envelope not generated, no information available." << std::endl;
172 std::cout << "Envelope info" << std::endl
173 << "* size = " << m_envelopeSize << std::endl
174 << "* max = " << m_envelopeMax << std::endl
175 << "* ยต = " << m_envelopeMean << std::endl
177 if (m_envelopeStdDevCalculated) {
178 std::cout << "* s = " << m_envelopeStdDev << std::endl;