// license:BSD-3-Clause // copyright-holders:Aaron Giles #include "emu.h" #include "bbd.h" //************************************************************************** // BBD DEVICE BASE //************************************************************************** //------------------------------------------------- // bbd_device_base - constructor //------------------------------------------------- template bbd_device_base::bbd_device_base(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, device_type type) : device_t(mconfig, type, tag, owner, clock), device_sound_interface(mconfig, *this), m_stream(nullptr), m_curpos(0), m_cv_handler(*this), m_next_bbdtime(attotime::zero) { std::fill_n(&m_buffer[0], Entries, 0); } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- template void bbd_device_base::device_start() { m_cv_handler.resolve(); if (m_cv_handler.isnull()) m_stream = stream_alloc(1, Outputs, sample_rate()); else m_stream = stream_alloc(1, Outputs, SAMPLE_RATE_OUTPUT_ADAPTIVE, STREAM_DISABLE_INPUT_RESAMPLING); save_item(NAME(m_buffer)); save_item(NAME(m_curpos)); save_item(NAME(m_next_bbdtime)); } //------------------------------------------------- // device_clock_changed - handle a clock change //------------------------------------------------- template void bbd_device_base::device_clock_changed() { if (m_cv_handler.isnull()) m_stream->set_sample_rate(sample_rate()); } //------------------------------------------------- // sound_stream_update - handle a stream update //------------------------------------------------- template void bbd_device_base::sound_stream_update(sound_stream &stream, std::vector const &inputs, std::vector &outputs) { // BBDs that I've seen so far typically have 2 outputs, with the first outputting // sample n-1 and the second outputting sampe n; if chips with more outputs // or other taps turn up, this logic will need to be made more flexible if (m_cv_handler.isnull()) { for (int sampindex = 0; sampindex < outputs[0].samples(); sampindex++) { for (int outnum = 0; outnum < Outputs; outnum++) outputs[outnum].put(sampindex, m_buffer[(m_curpos + (Outputs - 1) - outnum) % Entries]); m_buffer[m_curpos] = inputs[0].get(sampindex); m_curpos = (m_curpos + 1) % Entries; } } else { read_stream_view in(inputs[0], m_next_bbdtime); attotime intime = in.start_time(); attotime outtime = outputs[0].start_time(); int inpos = 0; // loop until all outputs generated for (int sampindex = 0; sampindex < outputs[0].samples(); sampindex++) { // we need to process some more BBD input while (outtime >= m_next_bbdtime) { // find the input sample that overlaps our start time while (intime + in.sample_period() < m_next_bbdtime) { inpos++; intime += in.sample_period(); } // copy that to the buffer m_buffer[m_curpos] = in.get(inpos); m_curpos = (m_curpos + 1) % std::size(m_buffer); // advance the end time of this BBD sample m_next_bbdtime += attotime(0, m_cv_handler(m_next_bbdtime)); } // copy the most recently-generated BBD data for (int outnum = 0; outnum < Outputs; outnum++) outputs[outnum].put(sampindex, outputval(outnum - (Outputs - 1))); outtime += outputs[0].sample_period(); } } } //************************************************************************** // MN3004 //************************************************************************** // device type definition DEFINE_DEVICE_TYPE(MN3004, mn3004_device, "mn3004", "MN3004 BBD") mn3004_device::mn3004_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : bbd_device_base(mconfig, tag, owner, clock, MN3004) { } //************************************************************************** // MN3005 //************************************************************************** // device type definition DEFINE_DEVICE_TYPE(MN3005, mn3005_device, "mn3005", "MN3005 BBD") mn3005_device::mn3005_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : bbd_device_base(mconfig, tag, owner, clock, MN3005) { } //************************************************************************** // MN3006 //************************************************************************** // device type definition DEFINE_DEVICE_TYPE(MN3006, mn3006_device, "mn3006", "MN3006 BBD") mn3006_device::mn3006_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : bbd_device_base(mconfig, tag, owner, clock, MN3006) { } //************************************************************************** // MN3204P //************************************************************************** // device type definition DEFINE_DEVICE_TYPE(MN3204P, mn3204p_device, "mn3204p", "MN3204P BBD") mn3204p_device::mn3204p_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : bbd_device_base(mconfig, tag, owner, clock, MN3204P) { } //************************************************************************** // MN3207P //************************************************************************** // device type definition DEFINE_DEVICE_TYPE(MN3207, mn3207_device, "mn3207", "MN3207 BBD") mn3207_device::mn3207_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : bbd_device_base(mconfig, tag, owner, clock, MN3207) { }