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Diffstat (limited to 'src/mame/audio/tvc.cpp')
-rw-r--r-- | src/mame/audio/tvc.cpp | 142 |
1 files changed, 0 insertions, 142 deletions
diff --git a/src/mame/audio/tvc.cpp b/src/mame/audio/tvc.cpp deleted file mode 100644 index ddae30f94ed..00000000000 --- a/src/mame/audio/tvc.cpp +++ /dev/null @@ -1,142 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Sandro Ronco -/*************************************************************************** - - Videotone TVC 32/64 sound emulation - -***************************************************************************/ - -#include "emu.h" -#include "tvc.h" - -// device type definition -DEFINE_DEVICE_TYPE(TVC_SOUND, tvc_sound_device, "tvc_sound", "TVC 64 Custom Sound") - -//------------------------------------------------- -// tvc_sound_device - constructor -//------------------------------------------------- - -tvc_sound_device::tvc_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : - device_t(mconfig, TVC_SOUND, tag, owner, clock), - device_sound_interface(mconfig, *this), - m_write_sndint(*this) -{ -} - -//------------------------------------------------- -// device_start - device-specific startup -//------------------------------------------------- -void tvc_sound_device::device_start() -{ - // resolve callbacks - m_write_sndint.resolve_safe(); - - m_stream = stream_alloc(0, 1, machine().sample_rate()); - m_sndint_timer = timer_alloc(TIMER_SNDINT); -} - -//------------------------------------------------- -// device_reset - device-specific reset -//------------------------------------------------- -void tvc_sound_device::device_reset() -{ - m_enabled = 0; - m_freq = 0; - m_incr = 0; - m_signal = 1; - m_sndint_timer->reset(); -} - - -//------------------------------------------------- -// device_timer - handler timer events -//------------------------------------------------- - -void tvc_sound_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) -{ - m_write_sndint(1); -} - -//------------------------------------------------- -// sound_stream_update - handle update requests for -// our sound stream -//------------------------------------------------- - -void tvc_sound_device::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) -{ - auto &output = outputs[0]; - int rate = output.sample_rate() / 2; - if (m_enabled && m_freq) - { - for (int sampindex = 0; sampindex < output.samples(); sampindex++) - { - output.put_int(sampindex, m_signal * m_volume, 32768 / 0x0800); - m_incr -= m_freq; - while(m_incr < 0) - { - m_incr += rate; - m_signal = -m_signal; - } - } - } - else - { - // fill output with 0 if the sound is disabled - output.fill(0); - } -} - - - -//------------------------------------------------- -// ports write -//------------------------------------------------- - -void tvc_sound_device::write(offs_t offset, uint8_t data) -{ - m_stream->update(); - - m_ports[offset] = data; - - switch(offset) - { - case 1: - m_enabled = BIT(data, 4); - [[fallthrough]]; - - case 0: - { - uint16_t pitch = (m_ports[0] | (m_ports[1]<<8)) & 0x0fff; - m_freq = (pitch == 0x0fff) ? 0 : (int)(195312.5 / (4096 - pitch)); - - if ((m_ports[1] & 0x20) && m_freq != 0) - m_sndint_timer->adjust(attotime::from_hz(m_freq), 0, attotime::from_hz(m_freq)); - else - m_sndint_timer->reset(); - - break; - } - - case 2: - m_volume = (data>>2) & 0x0f; - break; - } -} - - -//------------------------------------------------- -// tvc_sound_device::reset_divider -//------------------------------------------------- - -void tvc_sound_device::reset_divider() -{ - m_stream->update(); - - m_incr = 0; - m_signal = 1; - - if (m_ports[1] & 0x20 && m_freq != 0) - m_sndint_timer->adjust(attotime::from_hz(m_freq), 0, attotime::from_hz(m_freq)); - else - m_sndint_timer->reset(); -} |