Add unified functions for formatting dB values.

This also gives us an \infty symbols instead of “inf”.

diff --git a/mainwindow.cpp b/mainwindow.cpp
index e4f52f4d874d2729409a9d0a60b7d7fbee504427..68c446af8ed4b8921ede7b6339ba5af06b3193d5 100644 (file)
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -49,6 +49,34 @@ void quit_signal(int ignored)
        global_mainwindow->close();
 }
 
+string format_db_with_sign(double db)
+{
+       if (isfinite(db)) {
+               char buf[256];
+               snprintf(buf, sizeof(buf), "%+.1f dB", db);
+               return buf;
+       } else if (db < 0.0) {
+               return "-∞ dB";
+       } else {
+               // Should never happen, really.
+               return "+∞ dB";
+       }
+}
+
+string format_db(double db)
+{
+       if (isfinite(db)) {
+               char buf[256];
+               snprintf(buf, sizeof(buf), "%.1f dB", db);
+               return buf;
+       } else if (db < 0.0) {
+               return "-∞ dB";
+       } else {
+               // Should never happen, really.
+               return "+∞ dB";
+       }
+}
+
 }  // namespace
 
 MainWindow::MainWindow()
@@ -137,11 +165,10 @@ void MainWindow::mixer_created(Mixer *mixer)
        ui->limiter_enabled->setChecked(global_mixer->get_limiter_enabled());
        ui->makeup_gain_auto_checkbox->setChecked(global_mixer->get_final_makeup_gain_auto());
 
-       char buf[256];
-       snprintf(buf, sizeof(buf), "%.1f dB", mixer->get_limiter_threshold_dbfs());
-       ui->limiter_threshold_db_display->setText(buf);
-       snprintf(buf, sizeof(buf), "%.1f dB", mixer->get_compressor_threshold_dbfs());
-       ui->compressor_threshold_db_display->setText(buf);
+       ui->limiter_threshold_db_display->setText(
+               QString::fromStdString(format_db(mixer->get_limiter_threshold_dbfs())));
+       ui->compressor_threshold_db_display->setText(
+               QString::fromStdString(format_db(mixer->get_compressor_threshold_dbfs())));
 
        connect(ui->locut_cutoff_knob, &QDial::valueChanged, this, &MainWindow::cutoff_knob_changed);
        cutoff_knob_changed(ui->locut_cutoff_knob->value());
@@ -252,20 +279,16 @@ void MainWindow::limiter_threshold_knob_changed(int value)
 {
        float threshold_dbfs = value * 0.1f;
        global_mixer->set_limiter_threshold_dbfs(threshold_dbfs);
-
-       char buf[256];
-       snprintf(buf, sizeof(buf), "%.1f dB", threshold_dbfs);
-       ui->limiter_threshold_db_display->setText(buf);
+       ui->limiter_threshold_db_display->setText(
+               QString::fromStdString(format_db(threshold_dbfs)));
 }
 
 void MainWindow::compressor_threshold_knob_changed(int value)
 {
        float threshold_dbfs = value * 0.1f;
        global_mixer->set_compressor_threshold_dbfs(threshold_dbfs);
-
-       char buf[256];
-       snprintf(buf, sizeof(buf), "%.1f dB", threshold_dbfs);
-       ui->compressor_threshold_db_display->setText(buf);
+       ui->compressor_threshold_db_display->setText(
+               QString::fromStdString(format_db(threshold_dbfs)));
 }
 
 void MainWindow::reset_meters_button_clicked()
@@ -297,9 +320,7 @@ void MainWindow::audio_level_callback(float level_lufs, float peak_db, float glo
                ui->lra_meter->set_levels(global_level_lufs, range_low_lufs, range_high_lufs);
                ui->correlation_meter->set_correlation(correlation);
 
-               char buf[256];
-               snprintf(buf, sizeof(buf), "%.1f", peak_db);
-               ui->peak_display->setText(buf);
+               ui->peak_display->setText(QString::fromStdString(format_db(peak_db)));
                if (peak_db > -0.1f) {  // -0.1 dBFS is EBU peak limit.
                        ui->peak_display->setStyleSheet("QLabel { background-color: red; color: white; }");
                } else {
@@ -309,14 +330,14 @@ void MainWindow::audio_level_callback(float level_lufs, float peak_db, float glo
                ui->gainstaging_knob->blockSignals(true);
                ui->gainstaging_knob->setValue(lrintf(gain_staging_db * 10.0f));
                ui->gainstaging_knob->blockSignals(false);
-               snprintf(buf, sizeof(buf), "%+.1f dB", gain_staging_db);
-               ui->gainstaging_db_display->setText(buf);
+               ui->gainstaging_db_display->setText(
+                       QString::fromStdString(format_db_with_sign(gain_staging_db)));
 
                ui->makeup_gain_knob->blockSignals(true);
                ui->makeup_gain_knob->setValue(lrintf(final_makeup_gain_db * 10.0f));
                ui->makeup_gain_knob->blockSignals(false);
-               snprintf(buf, sizeof(buf), "%+.1f dB", final_makeup_gain_db);
-               ui->makeup_gain_db_display->setText(buf);
+               ui->makeup_gain_db_display->setText(
+                       QString::fromStdString(format_db_with_sign(final_makeup_gain_db)));
        });
 }