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];
75 m_producer->set_speed(1.0); // This is necessary, otherwise we don't get any new frames in the 2nd run.
76 for (int i = 0; i < m_envelopeSize; i++) {
78 frame = m_producer->get_frame(i);
79 position = mlt_frame_get_position(frame->get_frame());
80 samples = mlt_sample_calculator(m_producer->get_fps(), samplingRate, position);
82 int16_t *data = static_cast<int16_t*>(frame->get_audio(format_s16, samplingRate, channels, samples));
85 for (int k = 0; k < samples; k++) {
90 m_envelopeMean += sum;
91 if (sum > m_envelopeMax) {
95 // std::cout << position << "|" << m_producer->get_playtime()
96 // << "-" << m_producer->get_in() << "+" << m_producer->get_out() << " ";
100 m_envelopeMean /= m_envelopeSize;
101 std::cout << "Calculating the envelope (" << m_envelopeSize << " frames) took "
102 << t.elapsed() << " ms." << std::endl;
105 int64_t AudioEnvelope::loadStdDev()
107 if (m_envelopeStdDevCalculated) {
108 std::cout << "Standard deviation already calculated, not re-calculating." << std::endl;
111 if (m_envelope == NULL) {
115 m_envelopeStdDev = 0;
116 for (int i = 0; i < m_envelopeSize; i++) {
117 m_envelopeStdDev += sqrt((m_envelope[i]-m_envelopeMean)*(m_envelope[i]-m_envelopeMean)/m_envelopeSize);
119 m_envelopeStdDevCalculated = true;
122 return m_envelopeStdDev;
125 void AudioEnvelope::normalizeEnvelope(bool clampTo0)
127 if (m_envelope == NULL) {
131 if (!m_envelopeIsNormalized) {
135 for (int i = 0; i < m_envelopeSize; i++) {
137 m_envelope[i] -= m_envelopeMean;
140 if (m_envelope[i] < 0) { m_envelope[i] = 0; }
143 if (m_envelope[i] > m_envelopeMax) {
144 m_envelopeMax = m_envelope[i];
147 newMean += m_envelope[i];
149 m_envelopeMean = newMean / m_envelopeSize;
151 m_envelopeIsNormalized = true;
156 QImage AudioEnvelope::drawEnvelope()
158 if (m_envelope == NULL) {
162 QImage img(m_envelopeSize, 400, QImage::Format_ARGB32);
163 img.fill(qRgb(255,255,255));
165 for (int x = 0; x < img.width(); x++) {
166 fy = m_envelope[x]/double(m_envelopeMax) * img.height();
167 for (int y = img.height()-1; y > img.height()-1-fy; y--) {
168 img.setPixel(x,y, qRgb(50, 50, 50));
174 void AudioEnvelope::dumpInfo() const
176 if (m_envelope == NULL) {
177 std::cout << "Envelope not generated, no information available." << std::endl;
179 std::cout << "Envelope info" << std::endl
180 << "* size = " << m_envelopeSize << std::endl
181 << "* max = " << m_envelopeMax << std::endl
182 << "* ยต = " << m_envelopeMean << std::endl
184 if (m_envelopeStdDevCalculated) {
185 std::cout << "* s = " << m_envelopeStdDev << std::endl;