bool get_supports_set_wb(unsigned channel);
void set_wb(unsigned channel, float r, float g, float b);
void set_wb_for_signal(int signal, float r, float g, float b);
bool get_supports_set_wb(unsigned channel);
void set_wb(unsigned channel, float r, float g, float b);
void set_wb_for_signal(int signal, float r, float g, float b);