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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/**********************************************************************************************
*
* Yamaha YMZ280B driver
* by Aaron Giles
*
**********************************************************************************************/
#ifndef MAME_SOUND_YMZ280B_H
#define MAME_SOUND_YMZ280B_H
#pragma once
#include "dirom.h"
#define YMZ280B_MAKE_WAVS 0
class ymz280b_device : public device_t, public device_sound_interface, public device_rom_interface<24>
{
public:
ymz280b_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);
// configuration helpers
auto irq_handler() { return m_irq_handler.bind(); }
u8 read(offs_t offset);
void write(offs_t offset, u8 data);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_post_load() override;
virtual void device_reset() override;
virtual void device_clock_changed() override;
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) override;
// device_rom_interface overrides
virtual void rom_bank_pre_change() override;
private:
/* struct describing a single playing ADPCM voice */
struct YMZ280BVoice
{
u8 playing; /* 1 if we are actively playing */
bool ended; /* indicate voice has ended in case samples_left is 0 */
u8 keyon; /* 1 if the key is on */
u8 looping; /* 1 if looping is enabled */
u8 mode; /* current playback mode */
u16 fnum; /* frequency */
u8 level; /* output level */
u8 pan; /* panning */
u32 start; /* start address, in nibbles */
u32 stop; /* stop address, in nibbles */
u32 loop_start; /* loop start address, in nibbles */
u32 loop_end; /* loop end address, in nibbles */
u32 position; /* current position, in nibbles */
s32 signal; /* current ADPCM signal */
s32 step; /* current ADPCM step */
s32 loop_signal; /* signal at loop start */
s32 loop_step; /* step at loop start */
u32 loop_count; /* number of loops so far */
s32 output_left; /* output volume (left) */
s32 output_right; /* output volume (right) */
s32 output_step; /* step value for frequency conversion */
s32 output_pos; /* current fractional position */
s16 last_sample; /* last sample output */
s16 curr_sample; /* current sample target */
u8 irq_schedule; /* 1 if the IRQ state is updated by timer */
emu_timer *timer;
};
void update_irq_state();
void update_step(YMZ280BVoice *voice);
void update_volumes(YMZ280BVoice *voice);
TIMER_CALLBACK_MEMBER(update_irq_state_timer_common);
int generate_adpcm(YMZ280BVoice *voice, s16 *buffer, int samples);
int generate_pcm8(YMZ280BVoice *voice, s16 *buffer, int samples);
int generate_pcm16(YMZ280BVoice *voice, s16 *buffer, int samples);
void write_to_register(int data);
int compute_status();
// internal state
YMZ280BVoice m_voice[8]; /* the 8 voices */
u8 m_current_register; /* currently accessible register */
u8 m_status_register; /* current status register */
u8 m_irq_state; /* current IRQ state */
u8 m_irq_mask; /* current IRQ mask */
u8 m_irq_enable; /* current IRQ enable */
u8 m_keyon_enable; /* key on enable */
u8 m_ext_mem_enable; /* external memory enable */
u8 m_ext_readlatch; /* external memory prefetched data */
u32 m_ext_mem_address_hi;
u32 m_ext_mem_address_mid;
u32 m_ext_mem_address; /* where the CPU can read the ROM */
devcb_write_line m_irq_handler; /* IRQ callback */
XTAL m_master_clock; /* master clock frequency */
sound_stream *m_stream; /* which stream are we using */
std::unique_ptr<s16[]> m_scratch;
#if YMZ280B_MAKE_WAVS
void *m_wavresample; /* resampled waveform */
#endif
};
DECLARE_DEVICE_TYPE(YMZ280B, ymz280b_device)
#endif // MAME_SOUND_YMZ280B_H
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