Make a non-linear fader for dB use. Not perfect yet, but will do.

[nageru] / mainwindow.cpp

diff --git a/mainwindow.cpp b/mainwindow.cpp
index c1a3836b2ff7a97b4e23c3b9acfd5c384a38cfcf..3f9873ffa76983866ed9c8c02ce164d6bc075206 100644 (file)
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -255,7 +255,7 @@ void MainWindow::setup_audio_miniview()
                // TODO: Set the fader position.
                ui->faders->addWidget(channel);
 
-               connect(ui_audio_miniview->fader, &QAbstractSlider::valueChanged,
+               connect(ui_audio_miniview->fader, &NonLinearFader::dbValueChanged,
                        bind(&MainWindow::mini_fader_changed, this, ui_audio_miniview, bus_index, _1));
        }
 }
@@ -381,13 +381,15 @@ void MainWindow::compressor_threshold_knob_changed(int value)
                QString::fromStdString(format_db(threshold_dbfs, DB_WITH_SIGN)));
 }
 
-void MainWindow::mini_fader_changed(Ui::AudioMiniView *ui, int channel, int value)
+void MainWindow::mini_fader_changed(Ui::AudioMiniView *ui, int channel, double volume_db)
 {
-       float volume_db = value * 0.1f;
-
        char buf[256];
-       snprintf(buf, sizeof(buf), "%+.1f dB", volume_db);
-       ui->fader_label->setText(buf);
+       if (isfinite(volume_db)) {
+               snprintf(buf, sizeof(buf), "%+.1f dB", volume_db);
+               ui->fader_label->setText(buf);
+       } else {
+               ui->fader_label->setText("-∞ dB");
+       }
 
        global_mixer->get_audio_mixer()->set_fader_volume(channel, volume_db);
 }