diff options
Diffstat (limited to 'src/devices/sound/bbd.cpp')
-rw-r--r-- | src/devices/sound/bbd.cpp | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/src/devices/sound/bbd.cpp b/src/devices/sound/bbd.cpp new file mode 100644 index 00000000000..e270108b04e --- /dev/null +++ b/src/devices/sound/bbd.cpp @@ -0,0 +1,165 @@ +// 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) +{ +} |