src/hardware/snd_pc98/sound/pcm86.h

enum {
        PCM86_LOGICALBUF        = 0x8000,
        PCM86_BUFSIZE           = (1 << 16),
        PCM86_BUFMSK            = ((1 << 16) - 1),

        PCM86_DIVBIT            = 10,
        PCM86_DIVENV            = (1 << PCM86_DIVBIT),

        PCM86_RESCUE            = 20
};

#define PCM86_EXTBUF            pcm86.rescue                                    // �~�ω��؁c
#define PCM86_REALBUFSIZE       (PCM86_LOGICALBUF + PCM86_EXTBUF)

#define RECALC_NOWCLKWAIT(cnt) {                                                                                \
                pcm86.virbuf -= (cnt << pcm86.stepbit);                                                 \
                if (pcm86.virbuf < 0) {                                                                                 \
                        pcm86.virbuf &= pcm86.stepmask;                                                         \
                }                                                                                                                               \
        }

typedef struct {
        SINT32  divremain;
        SINT32  div;
        SINT32  div2;
        SINT32  smp;
        SINT32  lastsmp;
        SINT32  smp_l;
        SINT32  lastsmp_l;
        SINT32  smp_r;
        SINT32  lastsmp_r;

        UINT32  readpos;                        // DSOUND�Đ��ʒu
        UINT32  wrtpos;                         // �����݈ʒu
        SINT32  realbuf;                        // DSOUND�p�̃f�[�^��
        SINT32  virbuf;                         // 86PCM(bufsize:0x8000)�̃f�[�^��
        SINT32  rescue;

        SINT32  fifosize;
        SINT32  volume;
        SINT32  vol5;

        UINT32  lastclock;
        UINT32  stepclock;
        UINT    stepmask;

        UINT8   fifo;
        UINT8   extfunc;
        UINT8   dactrl;
        UINT8   _write;
        UINT8   stepbit;
        UINT8   reqirq;
        UINT8   irqflag;
        UINT8   padding[1];

        UINT8   buffer[PCM86_BUFSIZE];
} _PCM86, *PCM86;

typedef struct {
        UINT    rate;
        UINT    vol;
} PCM86CFG;


#ifdef __cplusplus
extern "C" {
#endif

extern const UINT pcm86rate8[];

void pcm86_cb(NEVENTITEM item);

void pcm86gen_initialize(UINT rate);
void pcm86gen_setvol(UINT vol);

void pcm86_reset(void);
void pcm86gen_update(void);
void pcm86_setpcmrate(REG8 val);
void pcm86_setnextintr(void);

void SOUNDCALL pcm86gen_checkbuf(void);
void SOUNDCALL pcm86gen_getpcm(void *hdl, SINT32 *pcm, UINT count);

BOOL pcm86gen_intrq(void);

#ifdef __cplusplus
}
#endif