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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
#include "emu.h"
#include "bbd.h"
//**************************************************************************
// BBD DEVICE BASE
//**************************************************************************
//-------------------------------------------------
// bbd_device_base - constructor
//-------------------------------------------------
template<int Entries, int Outputs>
bbd_device_base<Entries, Outputs>::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<int Entries, int Outputs>
void bbd_device_base<Entries, Outputs>::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<int Entries, int Outputs>
void bbd_device_base<Entries, Outputs>::device_clock_changed()
{
m_stream->set_sample_rate(sample_rate());
}
//-------------------------------------------------
// sound_stream_update - handle a stream update
//-------------------------------------------------
template<int Entries, int Outputs>
void bbd_device_base<Entries, Outputs>::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &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)
{
}
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