using namespace std;
+namespace {
+
+int lufs_to_pos(float level_lu, int height)
+{
+ 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)
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;
{
unique_lock<mutex> lock(level_mutex);
}
float level_lu = level_lufs + 23.0f;
- 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));
- if (y >= 0 && y < height()) {
- painter.setPen(Qt::white);
- painter.drawLine(0, y, width(), y);
- }
+ int y = lufs_to_pos(level_lu, height());
+ painter.setPen(Qt::white);
+ painter.drawLine(0, y, width(), y);
}