// license:BSD-3-Clause // copyright-holders:Derrick Renaud, Couriersud #include "emu.h" #include "flt_vol.h" // device type definition DEFINE_DEVICE_TYPE(FILTER_VOLUME, filter_volume_device, "filter_volume", "Volume Filter") //------------------------------------------------- // filter_volume_device - constructor //------------------------------------------------- filter_volume_device::filter_volume_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, FILTER_VOLUME, tag, owner, clock), device_sound_interface(mconfig, *this), m_stream(nullptr), m_gain(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void filter_volume_device::device_start() { m_gain = 0x100; m_stream = stream_alloc(1, 1, SAMPLE_RATE_OUTPUT_ADAPTIVE); } //------------------------------------------------- // sound_stream_update - handle a stream update //------------------------------------------------- void filter_volume_device::sound_stream_update(sound_stream &stream, std::vector const &inputs, std::vector &outputs) { // no need to work here; just copy input stream to output and apply gain outputs[0] = inputs[0]; outputs[0].apply_gain(m_gain); } void filter_volume_device::flt_volume_set_volume(float volume) { m_stream->update(); m_gain = volume; }