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/*
vboy.h - Virtual Boy audio emulation
By Richard Bannister and Gil Pedersen.
MESS device adaptation by R. Belmont
*/
#pragma once
#ifndef __VBOY_SND_H__
#define __VBOY_SND_H__
//**************************************************************************
// CONSTANTS
//**************************************************************************
#define AUDIO_FREQ 44100
#define CHANNELS 4
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_VBOYSND_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, VBOYSND, AUDIO_FREQ)
#define MCFG_VBOYSND_REPLACE(_tag) \
MCFG_DEVICE_REPLACE(_tag, VBOYSND, AUDIO_FREQ)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
typedef struct {
INT8 playing; // the sound is playing
// state when sound was enabled
UINT32 env_steptime; // Envelope step time
UINT8 env0; // Envelope data
UINT8 env1; // Envelope data
UINT8 volLeft; // Left output volume
UINT8 volRight; // Right output volume
UINT8 sample[580]; // sample to play
int sample_len; // length of sample
// values that change, as the sample is played
int offset; // current offset in sample
int time; // the duration that this sample is to be played
UINT8 envelope; // Current envelope level (604)
int env_time; // The duration between envelope decay/grow (608)
} s_snd_channel;
typedef struct {
INT32 sINT;
INT32 sLRV;
INT32 sFQL;
INT32 sFQH;
INT32 sEV0;
INT32 sEV1;
INT32 sRAM;
} s_regchan;
typedef struct {
// Sound registers structure
s_regchan c[4];
} s_sreg;
// ======================> vboysnd_device
class vboysnd_device : public device_t, public device_sound_interface
{
public:
// construction/destruction
vboysnd_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
DECLARE_READ8_MEMBER(read);
DECLARE_WRITE8_MEMBER(write);
sound_stream *m_stream;
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
// inline data
s_sreg sound_registers(void);
s_snd_channel snd_channel[5];
UINT16 waveFreq2LenTbl[2048];
UINT16 waveTimer2LenTbl[32];
UINT16 waveEnv2LenTbl[8];
emu_timer *m_timer;
UINT8 m_aram[0x600];
};
// device type definition
extern const device_type VBOYSND;
#endif //__VBOY_SND_H__
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