+ bool eventFilter(QObject *watched, QEvent *event) override;
+ void set_white_balance(int channel_number, int x, int y);
+
+ // Called from the mixer.
+ void audio_level_callback(float level_lufs, float peak_db, float global_level_lufs, float range_low_lufs, float range_high_lufs, float gain_staging_db, float final_makeup_gain_db);
+ timeval last_audio_level_callback{0, 0};
+