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#include "audiomonitor.h"
#include "project/sequence.h"
#include "playback/audio.h"
#include "panels/panels.h"
#include "panels/timeline.h"
#include <QPainter>
#include <QLinearGradient>
#include <QtMath>
#define AUDIO_MONITOR_PEAK_HEIGHT 15
#define AUDIO_MONITOR_GAP 3
extern "C" {
#include "libavformat/avformat.h"
}
AudioMonitor::AudioMonitor(QWidget *parent) : QWidget(parent) {
reset();
}
void AudioMonitor::reset() {
sample_cache_offset = -1;
sample_cache.clear();
update();
}
void AudioMonitor::resizeEvent(QResizeEvent *e) {
gradient = QLinearGradient(QPoint(0, rect().top()), QPoint(0, rect().bottom()));
gradient.setColorAt(0, Qt::red);
gradient.setColorAt(0.25, Qt::yellow);
gradient.setColorAt(1, Qt::green);
QWidget::resizeEvent(e);
}
void AudioMonitor::paintEvent(QPaintEvent *) {
if (sequence != NULL) {
QPainter p(this);
int channel_x = AUDIO_MONITOR_GAP;
int channel_count = av_get_channel_layout_nb_channels(sequence->audio_layout);
/*if (peaks.size() != channel_count) {
peaks.resize(channel_count);
peaks.fill(false);
}*/
int channel_width = (width()/channel_count) - AUDIO_MONITOR_GAP;
long playhead_offset = -1;
int i;
for (i=0;i<channel_count;i++) {
QRect r(channel_x, AUDIO_MONITOR_PEAK_HEIGHT + AUDIO_MONITOR_GAP, channel_width, height());
p.fillRect(r, gradient);
if (sample_cache_offset != -1 && sample_cache.size() > 0) {
playhead_offset = (sequence->playhead - sample_cache_offset) * channel_count;
if (playhead_offset >= 0 && playhead_offset < sample_cache.size()) {
double multiplier = 1 - qAbs((double) sample_cache.at(playhead_offset+i) / 32768.0); // 16-bit int divided to float
/*if (multiplier == (double) 0) {
peaks[i] = true;
}*/
r.setHeight(r.height()*multiplier);
} else {
reset();
}
}
/*QRect peak_rect(channel_x, 0, channel_width, AUDIO_MONITOR_PEAK_HEIGHT);
if (peaks.at(i)) {
p.fillRect(peak_rect, QColor(255, 0, 0));
} else {
p.fillRect(peak_rect, QColor(64, 0, 0));
}*/
p.fillRect(r, QColor(0, 0, 0, 160));
channel_x += channel_width + AUDIO_MONITOR_GAP;
}
if (playhead_offset > -1) {
// clean up used samples
bool error = false;
while (sample_cache_offset < sequence->playhead && !error) {
sample_cache_offset++;
for (i=0;i<channel_count;i++) {
if (sample_cache.isEmpty()) {
reset();
error = true;
break;
} else {
sample_cache.removeFirst();
}
}
}
}
}
}
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