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// license:BSD-3-Clause
// copyright-holders:Quench
/* An interface for the ES8712 ADPCM chip */
#pragma once
#ifndef __ES8712_H__
#define __ES8712_H__
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_ES8712_ADD(_tag, _clock) \
MCFG_DEVICE_ADD(_tag, ES8712, _clock)
#define MCFG_ES8712_REPLACE(_tag, _clock) \
MCFG_DEVICE_REPLACE(_tag, ES8712, _clock)
#define MCFG_ES8712_RESET_HANDLER(_devcb) \
devcb = &es8712_device::set_reset_handler(*device, DEVCB_##_devcb);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> es8712_device
class es8712_device : public device_t,
public device_sound_interface
{
public:
es8712_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
~es8712_device() { }
// static configuration
template<class _Object> static devcb_base &set_reset_handler(device_t &device, _Object object) { return downcast<es8712_device &>(device).m_reset_handler.set_callback(object); }
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
public:
DECLARE_WRITE8_MEMBER(write);
DECLARE_READ8_MEMBER(read);
public:
void play();
void set_bank_base(int base);
void set_frequency(int frequency);
private:
void compute_tables();
void generate_adpcm(stream_sample_t *buffer, int samples);
void es8712_state_save_register();
private:
required_region_ptr<uint8_t> m_rom;
devcb_write_line m_reset_handler;
uint8_t m_playing; /* 1 if we're actively playing */
uint32_t m_base_offset; /* pointer to the base memory location */
uint32_t m_sample; /* current sample number */
uint32_t m_count; /* total samples to play */
uint32_t m_signal; /* current ADPCM signal */
uint32_t m_step; /* current ADPCM step */
uint32_t m_start; /* starting address for the next loop */
uint32_t m_end; /* ending address for the next loop */
int32_t m_bank_offset;
sound_stream *m_stream; /* which stream are we playing on? */
};
extern const device_type ES8712;
#endif /* __ES8712_H__ */
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