#include <QPainter>
#include "vumeter.h"
+#include "vu_common.h"
using namespace std;
-namespace {
-
-int lufs_to_pos(float level_lu, int height)
+VUMeter::VUMeter(QWidget *parent)
+ : QWidget(parent)
{
- const float min_level = 18.0f; // y=0 is top of screen, so “min” is the loudest level.
- const float max_level = -36.0f;
- int y = lrintf(height * (level_lu - min_level) / (max_level - min_level));
- y = std::max(y, 0);
- y = std::min(y, height - 1);
- return y;
}
-} // namespace
-
-VUMeter *global_vu_meter = nullptr;
-QLabel *global_peak_display = nullptr;
-
-VUMeter::VUMeter(QWidget *parent)
- : QWidget(parent)
+void VUMeter::resizeEvent(QResizeEvent *event)
{
+ recalculate_pixmaps();
}
void VUMeter::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
- painter.fillRect(0, 0, width(), height(), Qt::black);
-
- int min_y = lufs_to_pos(1.0f, height());
- int max_y = lufs_to_pos(-1.0f, height());
- painter.fillRect(0, min_y, width(), max_y - min_y, Qt::green);
-
- float level_lufs;
+ float level_lufs[2], peak_lufs[2];
{
unique_lock<mutex> lock(level_mutex);
- level_lufs = this->level_lufs;
+ level_lufs[0] = this->level_lufs[0];
+ level_lufs[1] = this->level_lufs[1];
+ peak_lufs[0] = this->peak_lufs[0];
+ peak_lufs[1] = this->peak_lufs[1];
+ }
+
+ int mid = width() / 2;
+
+ for (unsigned channel = 0; channel < 2; ++channel) {
+ int left = (channel == 0) ? 0 : mid;
+ int right = (channel == 0) ? mid : width();
+ float level_lu = level_lufs[channel] - ref_level_lufs;
+ int on_pos = lrint(lufs_to_pos(level_lu, height()));
+
+ if (flip) {
+ QRect on_rect(left, 0, right - left, height() - on_pos);
+ QRect off_rect(left, height() - on_pos, right - left, height());
+
+ painter.drawPixmap(on_rect, on_pixmap, on_rect);
+ painter.drawPixmap(off_rect, off_pixmap, off_rect);
+ } else {
+ QRect off_rect(left, 0, right - left, on_pos);
+ QRect on_rect(left, on_pos, right - left, height() - on_pos);
+
+ painter.drawPixmap(off_rect, off_pixmap, off_rect);
+ painter.drawPixmap(on_rect, on_pixmap, on_rect);
+ }
+
+ float peak_lu = peak_lufs[channel] - ref_level_lufs;
+ if (peak_lu >= min_level && peak_lu <= max_level) {
+ int peak_pos = lrint(lufs_to_pos(peak_lu, height()));
+ QRect peak_rect(left, peak_pos - 1, right, 2);
+ painter.drawPixmap(peak_rect, full_on_pixmap, peak_rect);
+ }
}
+}
+
+void VUMeter::recalculate_pixmaps()
+{
+ full_on_pixmap = QPixmap(width(), height());
+ QPainter full_on_painter(&full_on_pixmap);
+ draw_vu_meter(full_on_painter, width(), height(), 0, 0.0, true, min_level, max_level, flip);
+
+ on_pixmap = QPixmap(width(), height());
+ QPainter on_painter(&on_pixmap);
+ draw_vu_meter(on_painter, width(), height(), 0, 2.0, true, min_level, max_level, flip);
- float level_lu = level_lufs + 23.0f;
- int y = lufs_to_pos(level_lu, height());
- painter.setPen(Qt::white);
- painter.drawLine(0, y, width(), y);
+ off_pixmap = QPixmap(width(), height());
+ QPainter off_painter(&off_pixmap);
+ draw_vu_meter(off_painter, width(), height(), 0, 2.0, false, min_level, max_level, flip);
}