// constructor
public dac_device_base(machine_config mconfig, device_type type, string tag, device_t owner, uint32_t clock, u8 bits, dac_mapper_callback mapper, stream_buffer_sample_t gain)
: base(mconfig, type, tag, owner, clock)
{
m_class_interfaces.Add(new device_sound_interface_dac_device_base(mconfig, this)); //device_sound_interface(mconfig, *this);
m_disound = GetClassInterface <device_sound_interface_dac_device_base>();
m_stream = null;
m_curval = 0;
m_value_map = new std.vector <stream_buffer_sample_t>(1 << bits);
m_bits = bits;
m_mapper = mapper;
m_gain = gain;
m_range_min = (bits == 1) ? (stream_buffer_sample_t)0.0 : (stream_buffer_sample_t)(-1.0);
m_range_max = (stream_buffer_sample_t)1.0;
}
protected dac_word_device_base(machine_config mconfig, device_type type, string tag, device_t owner, u32 clock, u8 bits, dac_mapper_callback mapper, stream_buffer_sample_t gain)
: base(mconfig, type, tag, owner, clock, bits, mapper, gain)
{
}