9 int lufs_to_pos(float level_lu, int height)
11 const float min_level = 18.0f; // y=0 is top of screen, so “min” is the loudest level.
12 const float max_level = -36.0f;
13 int y = lrintf(height * (level_lu - min_level) / (max_level - min_level));
15 y = std::min(y, height - 1);
21 VUMeter *global_vu_meter = nullptr;
22 QLabel *global_peak_display = nullptr;
24 VUMeter::VUMeter(QWidget *parent)
29 void VUMeter::paintEvent(QPaintEvent *event)
31 QPainter painter(this);
33 painter.fillRect(0, 0, width(), height(), Qt::black);
35 int min_y = lufs_to_pos(1.0f, height());
36 int max_y = lufs_to_pos(-1.0f, height());
37 painter.fillRect(0, min_y, width(), max_y - min_y, Qt::green);
41 unique_lock<mutex> lock(level_mutex);
42 level_lufs = this->level_lufs;
45 float level_lu = level_lufs + 23.0f;
46 int y = lufs_to_pos(level_lu, height());
47 painter.setPen(Qt::white);
48 painter.drawLine(0, y, width(), y);