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// license:???
// 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)
//**************************************************************************
// 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 clock);
~es8712_device() { }
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
public:
DECLARE_WRITE8_MEMBER( es8712_w );
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> m_rom;
UINT8 m_playing; /* 1 if we're actively playing */
UINT32 m_base_offset; /* pointer to the base memory location */
UINT32 m_sample; /* current sample number */
UINT32 m_count; /* total samples to play */
UINT32 m_signal; /* current ADPCM signal */
UINT32 m_step; /* current ADPCM step */
UINT32 m_start; /* starting address for the next loop */
UINT32 m_end; /* ending address for the next loop */
UINT8 m_repeat; /* Repeat current sample when 1 */
INT32 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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