/***************************************************************************

  snes_snd.c

  File to handle the sound emulation of the Nintendo Super NES.

  By R. Belmont, adapted from OpenSPC 0.3.99 by Brad Martin with permission.
  Thanks to Brad and also to Charles Bilyu? of SNeESe.

  OpenSPC's license terms (the LGPL) follow:

 ---------------------------------------------------------------------------

  Copyright Brad Martin.

  OpenSPC is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  OpenSPC is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU Lesser General Public License for more details.

***************************************************************************/

#include "emu.h"
#include "audio/snes_snd.h"

/***************************************************************************
 CONSTANTS AND MACROS
***************************************************************************/

static const int gauss[]=
{
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000, 0x000,
	0x001, 0x001, 0x001, 0x001, 0x001, 0x001, 0x001, 0x001,
	0x001, 0x001, 0x001, 0x002, 0x002, 0x002, 0x002, 0x002,
	0x002, 0x002, 0x003, 0x003, 0x003, 0x003, 0x003, 0x004,
	0x004, 0x004, 0x004, 0x004, 0x005, 0x005, 0x005, 0x005,
	0x006, 0x006, 0x006, 0x006, 0x007, 0x007, 0x007, 0x008,
	0x008, 0x008, 0x009, 0x009, 0x009, 0x00A, 0x00A, 0x00A,
	0x00B, 0x00B, 0x00B, 0x00C, 0x00C, 0x00D, 0x00D, 0x00E,
	0x00E, 0x00F, 0x00F, 0x00F, 0x010, 0x010, 0x011, 0x011,
	0x012, 0x013, 0x013, 0x014, 0x014, 0x015, 0x015, 0x016,
	0x017, 0x017, 0x018, 0x018, 0x019, 0x01A, 0x01B, 0x01B,
	0x01C, 0x01D, 0x01D, 0x01E, 0x01F, 0x020, 0x020, 0x021,
	0x022, 0x023, 0x024, 0x024, 0x025, 0x026, 0x027, 0x028,
	0x029, 0x02A, 0x02B, 0x02C, 0x02D, 0x02E, 0x02F, 0x030,
	0x031, 0x032, 0x033, 0x034, 0x035, 0x036, 0x037, 0x038,
	0x03A, 0x03B, 0x03C, 0x03D, 0x03E, 0x040, 0x041, 0x042,
	0x043, 0x045, 0x046, 0x047, 0x049, 0x04A, 0x04C, 0x04D,
	0x04E, 0x050, 0x051, 0x053, 0x054, 0x056, 0x057, 0x059,
	0x05A, 0x05C, 0x05E, 0x05F, 0x061, 0x063, 0x064, 0x066,
	0x068, 0x06A, 0x06B, 0x06D, 0x06F, 0x071, 0x073, 0x075,
	0x076, 0x078, 0x07A, 0x07C, 0x07E, 0x080, 0x082, 0x084,
	0x086, 0x089, 0x08B, 0x08D, 0x08F, 0x091, 0x093, 0x096,
	0x098, 0x09A, 0x09C, 0x09F, 0x0A1, 0x0A3, 0x0A6, 0x0A8,
	0x0AB, 0x0AD, 0x0AF, 0x0B2, 0x0B4, 0x0B7, 0x0BA, 0x0BC,
	0x0BF, 0x0C1, 0x0C4, 0x0C7, 0x0C9, 0x0CC, 0x0CF, 0x0D2,
	0x0D4, 0x0D7, 0x0DA, 0x0DD, 0x0E0, 0x0E3, 0x0E6, 0x0E9,
	0x0EC, 0x0EF, 0x0F2, 0x0F5, 0x0F8, 0x0FB, 0x0FE, 0x101,
	0x104, 0x107, 0x10B, 0x10E, 0x111, 0x114, 0x118, 0x11B,
	0x11E, 0x122, 0x125, 0x129, 0x12C, 0x130, 0x133, 0x137,
	0x13A, 0x13E, 0x141, 0x145, 0x148, 0x14C, 0x150, 0x153,
	0x157, 0x15B, 0x15F, 0x162, 0x166, 0x16A, 0x16E, 0x172,
	0x176, 0x17A, 0x17D, 0x181, 0x185, 0x189, 0x18D, 0x191,
	0x195, 0x19A, 0x19E, 0x1A2, 0x1A6, 0x1AA, 0x1AE, 0x1B2,
	0x1B7, 0x1BB, 0x1BF, 0x1C3, 0x1C8, 0x1CC, 0x1D0, 0x1D5,
	0x1D9, 0x1DD, 0x1E2, 0x1E6, 0x1EB, 0x1EF, 0x1F3, 0x1F8,
	0x1FC, 0x201, 0x205, 0x20A, 0x20F, 0x213, 0x218, 0x21C,
	0x221, 0x226, 0x22A, 0x22F, 0x233, 0x238, 0x23D, 0x241,
	0x246, 0x24B, 0x250, 0x254, 0x259, 0x25E, 0x263, 0x267,
	0x26C, 0x271, 0x276, 0x27B, 0x280, 0x284, 0x289, 0x28E,
	0x293, 0x298, 0x29D, 0x2A2, 0x2A6, 0x2AB, 0x2B0, 0x2B5,
	0x2BA, 0x2BF, 0x2C4, 0x2C9, 0x2CE, 0x2D3, 0x2D8, 0x2DC,
	0x2E1, 0x2E6, 0x2EB, 0x2F0, 0x2F5, 0x2FA, 0x2FF, 0x304,
	0x309, 0x30E, 0x313, 0x318, 0x31D, 0x322, 0x326, 0x32B,
	0x330, 0x335, 0x33A, 0x33F, 0x344, 0x349, 0x34E, 0x353,
	0x357, 0x35C, 0x361, 0x366, 0x36B, 0x370, 0x374, 0x379,
	0x37E, 0x383, 0x388, 0x38C, 0x391, 0x396, 0x39B, 0x39F,
	0x3A4, 0x3A9, 0x3AD, 0x3B2, 0x3B7, 0x3BB, 0x3C0, 0x3C5,
	0x3C9, 0x3CE, 0x3D2, 0x3D7, 0x3DC, 0x3E0, 0x3E5, 0x3E9,
	0x3ED, 0x3F2, 0x3F6, 0x3FB, 0x3FF, 0x403, 0x408, 0x40C,
	0x410, 0x415, 0x419, 0x41D, 0x421, 0x425, 0x42A, 0x42E,
	0x432, 0x436, 0x43A, 0x43E, 0x442, 0x446, 0x44A, 0x44E,
	0x452, 0x455, 0x459, 0x45D, 0x461, 0x465, 0x468, 0x46C,
	0x470, 0x473, 0x477, 0x47A, 0x47E, 0x481, 0x485, 0x488,
	0x48C, 0x48F, 0x492, 0x496, 0x499, 0x49C, 0x49F, 0x4A2,
	0x4A6, 0x4A9, 0x4AC, 0x4AF, 0x4B2, 0x4B5, 0x4B7, 0x4BA,
	0x4BD, 0x4C0, 0x4C3, 0x4C5, 0x4C8, 0x4CB, 0x4CD, 0x4D0,
	0x4D2, 0x4D5, 0x4D7, 0x4D9, 0x4DC, 0x4DE, 0x4E0, 0x4E3,
	0x4E5, 0x4E7, 0x4E9, 0x4EB, 0x4ED, 0x4EF, 0x4F1, 0x4F3,
	0x4F5, 0x4F6, 0x4F8, 0x4FA, 0x4FB, 0x4FD, 0x4FF, 0x500,
	0x502, 0x503, 0x504, 0x506, 0x507, 0x508, 0x50A, 0x50B,
	0x50C, 0x50D, 0x50E, 0x50F, 0x510, 0x511, 0x511, 0x512,
	0x513, 0x514, 0x514, 0x515, 0x516, 0x516, 0x517, 0x517,
	0x517, 0x518, 0x518, 0x518, 0x518, 0x518, 0x519, 0x519,
	0x519, 0x519, 0x519, 0x519, 0x519, 0x519, 0x519, 0x519
};

#undef DEBUG
#undef DBG_KEY
#undef DBG_ENV
#undef DBG_PMOD
#undef DBG_BRR
#undef DBG_ECHO
#undef DBG_INTRP

#undef NO_PMOD
#undef NO_ECHO

#define CPU_RATE        1024000
#define SAMP_FREQ       32000


/* Original SPC DSP took samples 32000 times a second, which is once every (1024000/32000 = 32) cycles. */
#ifdef UNUSED_DEFINITION
	static const int               TS_CYC = CPU_RATE / SAMP_FREQ;
#endif

/* Ptrs to Gaussian table */
static const int *const G1 = &gauss[256];
static const int *const G2 = &gauss[512];
static const int *const G3 = &gauss[255];
static const int *const G4 = &gauss[0];

static const int        mask = 0xFF;

/* This table is for envelope timing.  It represents the number of counts
   that should be subtracted from the counter each sample period (32kHz).
   The counter starts at 30720 (0x7800). */
static const int CNT_INIT = 0x7800;
static const int ENVCNT[0x20]
  = {
    0x0000, 0x000F, 0x0014, 0x0018, 0x001E, 0x0028, 0x0030, 0x003C,
    0x0050, 0x0060, 0x0078, 0x00A0, 0x00C0, 0x00F0, 0x0140, 0x0180,
    0x01E0, 0x0280, 0x0300, 0x03C0, 0x0500, 0x0600, 0x0780, 0x0A00,
    0x0C00, 0x0F00, 0x1400, 0x1800, 0x1E00, 0x2800, 0x3C00, 0x7800
    };


/* Make reading the ADSR code easier */
#define SL( v )         (spc700->dsp_regs[((v) << 4) + 6] >> 5) 		/* Returns SUSTAIN level        */
#define SR( v )         (spc700->dsp_regs[((v) << 4) + 6] & 0x1f)		/* Returns SUSTAIN rate         */

/* Handle endianness */
#define LEtoME16( x ) LITTLE_ENDIANIZE_INT16(x)
#define MEtoLE16( x ) LITTLE_ENDIANIZE_INT16(x)


static int advance_envelope( device_t *device, int v);

/***************************************************************************
 TYPE DEFINITIONS
***************************************************************************/

typedef enum                        /* ADSR state type              */
{
	ATTACK,
	DECAY,
	SUSTAIN,
	RELEASE
} env_state_t32;

ALLOW_SAVE_TYPE(env_state_t32);

typedef struct                      /* Voice state type             */
{
	UINT16          mem_ptr;        /* Sample data memory pointer   */
	int             end;            /* End or loop after block      */
	int             envcnt;         /* Counts to envelope update    */
	env_state_t32   envstate;       /* Current envelope state       */
	int             envx;           /* Last env height (0-0x7FFF)   */
	int             filter;         /* Last header's filter         */
	int             half;           /* Active nybble of BRR         */
	int             header_cnt;     /* Bytes before new header (0-8)*/
	int             mixfrac;        /* Fractional part of smpl pstn */
	int             on_cnt;         /* Is it time to turn on yet?   */
	int             pitch;          /* Sample pitch (4096->32000Hz) */
	int             range;          /* Last header's range          */
	UINT32          samp_id;        /* Sample ID#                   */
	int             sampptr;        /* Where in sampbuf we are      */
	INT32           smp1;           /* Last sample (for BRR filter) */
	INT32           smp2;           /* Second-to-last sample decoded*/
	short           sampbuf[4];   /* Buffer for Gaussian interp   */
} voice_state_type;

typedef struct                      /* Source directory entry       */
{
	UINT16  vptr;           /* Ptr to start of sample data  */
	UINT16  lptr;           /* Loop pointer in sample data  */
} src_dir_type;


typedef struct _snes_sound_state  snes_sound_state;
struct _snes_sound_state
{
	UINT8                   *ram;
	sound_stream            *channel;
	UINT8                   dsp_regs[256];		/* DSP registers */
	UINT8                   ipl_region[64];		/* SPC top 64 bytes */

	int                     keyed_on;
	int                     keys;   			/* 8-bits for 8 voices */
	voice_state_type        voice_state[8];

	/* Noise stuff */
	int                     noise_cnt;
	int                     noise_lev;

	/* These are for the FIR echo filter */
#ifndef NO_ECHO
	short                   fir_lbuf[8];
	short                   fir_rbuf[8];
	int                     fir_ptr;
	int                     echo_ptr;
#endif

	/* timers */
	emu_timer               *timer[3];
	UINT8                   enabled[3];
	UINT16                  counter[3];

	/* IO ports */
	UINT8                   port_in[4];			/* SPC input ports */
	UINT8                   port_out[4];		/* SPC output ports */
};

/*****************************************************************************
    INLINE FUNCTIONS
*****************************************************************************/

INLINE snes_sound_state *get_safe_token( device_t *device )
{
	assert(device != NULL);
	assert(device->type() == SNES);

	return (snes_sound_state *)downcast<legacy_device_base *>(device)->token();
}

/*****************************************************************************
    IMPLEMENTATION
*****************************************************************************/


/*-------------------------------------------------
 dsp_reset

 Reset emulated DSP
-------------------------------------------------*/

static void dsp_reset( device_t *device )
{
	snes_sound_state *spc700 = get_safe_token(device);
	int   i;

#ifdef DEBUG
	logerror("dsp_reset\n");
#endif

	for (i = 0; i < 8; i++)
	{
#ifndef NO_ECHO
		spc700->fir_lbuf[i] = 0;
		spc700->fir_rbuf[i] = 0;
#endif
		spc700->voice_state[i].on_cnt = 0;
	}

#ifndef NO_ECHO
	spc700->fir_ptr   = 0;
	spc700->echo_ptr = 0;
#endif

	spc700->keys      = 0;
	spc700->keyed_on  = 0;
	spc700->noise_cnt = 0;
	spc700->noise_lev = 0x4000;
	spc700->dsp_regs[0x6c] |= 0xe0;
	spc700->dsp_regs[0x4c] = 0;
	spc700->dsp_regs[0x5c] = 0;
}


/*-------------------------------------------------
 dsp_update

 Mix one sample of audio. sound_ptr is a pointer
 to mix audio into
-------------------------------------------------*/

static void dsp_update( device_t *device, short *sound_ptr )
{
	snes_sound_state *spc700 = get_safe_token(device);
	int V;

#ifndef NO_ECHO
	int echo_base;
	int echol;
	int echor;
#endif

	int envx;
	int m;
	int outl;
	int outr;
	signed long outx;       /* Smpl height (must be signed) */
	src_dir_type * sd;
	int v;
	int vl;
	voice_state_type * vp;
	int vr;

	sd = (src_dir_type *) &spc700->ram[(int) spc700->dsp_regs[0x5d] << 8];

	/* Check for reset */
	if (spc700->dsp_regs[0x6c] & 0x80)
		dsp_reset(device);

	/* Here we check for keys on/off.  Docs say that successive writes to KON/KOF
    must be separated by at least 2 Ts periods or risk being neglected.
    Therefore DSP only looks at these during an update, and not at the time of
    the write.  Only need to do this once however, since the regs haven't
    changed over the whole period we need to catch up with. */
#ifdef DBG_KEY
	spc700->dsp_regs[0x4c] &= mask;
#endif

	/* Keying on a voice resets that bit in ENDX */
	spc700->dsp_regs[0x7c] &= ~spc700->dsp_regs[0x4c];

	/* Question: what is the expected behavior when pitch modulation is enabled on
    voice 0?  Jurassic Park 2 does this.  For now, using outx of zero for first
    voice. */
	outx = 0;

	/* Same table for noise and envelope */
	spc700->noise_cnt -= ENVCNT[spc700->dsp_regs[0x6c] & 0x1f];
	if (spc700->noise_cnt <= 0)
	{
		spc700->noise_cnt = CNT_INIT;
		spc700->noise_lev = (((spc700->noise_lev << 13) ^ (spc700->noise_lev << 14)) & 0x4000) | (spc700->noise_lev >> 1);
	}

	outl  = 0;
	outr  = 0;

#ifndef NO_ECHO
	echol = 0;
	echor = 0;
#endif

	for (v = 0, m = 1, V = 0; v < 8; v++, V += 16, m <<= 1)
	{
		vp = &spc700->voice_state[v];

		if (vp->on_cnt && (--vp->on_cnt == 0))
		{
			/* Voice was keyed on */
			spc700->keys       |= m;
			spc700->keyed_on   |= m;
			vl          = spc700->dsp_regs[(v << 4) + 4];
			vp->samp_id = *( UINT32 * )&sd[vl];
			vp->mem_ptr = LEtoME16(sd[vl].vptr);

#ifdef DBG_KEY
			logerror("Keying on voice %d, samp=0x%04X (0x%02X)\n", v, vp->mem_ptr, vl);
#endif

			vp->header_cnt = 0;
			vp->half       = 0;
			vp->envx       = 0;
			vp->end        = 0;
			vp->sampptr    = 0;
			vp->mixfrac    = 3 * 4096;

			/* NOTE: Real SNES does *not* appear to initialize the envelope
            counter to anything in particular.  The first cycle always seems to
            come at a random time sooner than expected; as yet, I have been
            unable to find any pattern.  I doubt it will matter though, so
            we'll go ahead and do the full time for now. */
			vp->envcnt   = CNT_INIT;
			vp->envstate = ATTACK;
		}

		if (spc700->dsp_regs[0x4c] & m & ~spc700->dsp_regs[0x5c])
		{
			/* Voice doesn't come on if key off is set */
			spc700->dsp_regs[0x4c] &= ~m;
			vp->on_cnt       = 8;

#ifdef DBG_KEY
			logerror("Key on set for voice %d\n", v);
#endif
		}

		if (spc700->keys & spc700->dsp_regs[0x5c] & m)
		{
			/* Voice was keyed off */
			vp->envstate = RELEASE;
			vp->on_cnt   = 0;

#ifdef DBG_KEY
			logerror("Keying off voice %d\n", v);
#endif
		}

		if (!(spc700->keys & m & mask) || ((envx = advance_envelope(device, v)) < 0))
		{
			spc700->dsp_regs[V + 8] = 0;
			spc700->dsp_regs[V + 9] = 0;
			outx             = 0;
			continue;
		}

		vp->pitch = LEtoME16(*((UINT16 *)&spc700->dsp_regs[V + 2])) & 0x3fff;

#ifndef NO_PMOD
		/* Pitch mod uses OUTX from last voice for this one.  Luckily we haven't
        modified OUTX since it was used for last voice. */
		if (spc700->dsp_regs[0x2d] & m)
		{
#ifdef DBG_PMOD
			logerror("Pitch Modulating voice %d, outx=%ld, old pitch=%d, ", v, outx, vp->pitch);
#endif
			vp->pitch = (vp->pitch * (outx + 32768)) >> 15;
			}
#endif

#ifdef DBG_PMOD
			logerror("pitch=%d\n", vp->pitch);
#endif

			for ( ; vp->mixfrac >= 0; vp->mixfrac -= 4096)
			{
				/* This part performs the BRR decode 'on-the-fly'.  This is more
                correct than the old way, which could be fooled if the data and/or
                the loop point changed while the sample was playing, or if the BRR
                decode didn't produce the same result every loop because of the
                filters.  The event interface still has no chance of keeping up
                with those kinds of tricks, though. */
				if (!vp->header_cnt)
				{
					if (vp->end & 1)
					{
						/* Docs say ENDX bit is set when decode of block with source
                        end flag set is done.  Does this apply to looping samples?
                        Some info I've seen suggests yes. */
						spc700->dsp_regs[0x7c] |= m;
						if (vp->end & 2)
						{
							vp->mem_ptr = LEtoME16(sd[spc700->dsp_regs[V + 4]].lptr);

#ifdef DBG_BRR
							logerror("BRR looping to 0x%04X\n", vp->mem_ptr);
#endif
						}
						else
						{
#ifdef DBG_KEY
							logerror("BRR decode end, voice %d\n", v);
#endif

							spc700->keys &= ~m;
							spc700->dsp_regs[V + 8] = 0;
							vp->envx         = 0;
							while (vp->mixfrac >= 0)
							{
								vp->sampbuf[vp->sampptr] = 0;
								outx         = 0;
								vp->sampptr  = (vp->sampptr + 1) & 3;
								vp->mixfrac -= 4096;
							}
							break;
						}
					}

					vp->header_cnt = 8;
					vl = (UINT8)spc700->ram[vp->mem_ptr++];
					vp->range  = vl >> 4;
					vp->end    = vl & 3;
					vp->filter = (vl & 12) >> 2;

#ifdef DBG_BRR
					logerror("V%d: header read, range=%d, end=%d, filter=%d\n", v, vp->range, vp->end, vp->filter);
#endif
				}

				if (vp->half == 0)
				{
					vp->half = 1;
					outx     = ((signed char)spc700->ram[vp->mem_ptr]) >> 4;
				}
				else
				{
					vp->half = 0;
					/* Funkiness to get 4-bit signed to carry through */
					outx   = (signed char)(spc700->ram[vp->mem_ptr++] << 4);
					outx >>= 4;
					vp->header_cnt--;
				}

#ifdef DBG_BRR
				logerror("V%d: nybble=%X, ptr=%04X, smp1=%d, smp2=%d\n", v, outx & 0x0f, vp->mem_ptr, vp->smp1, vp->smp2);
#endif

				/* For invalid ranges (D,E,F): if the nybble is negative, the result
                is F000.  If positive, 0000.  Nothing else like previous range,
                etc. seems to have any effect.  If range is valid, do the shift
                normally.  Note these are both shifted right once to do the filters
                properly, but the output will be shifted back again at the end. */
				if (vp->range <= 0xc)
				{
					outx = (outx << vp->range) >> 1;
				}
				else
				{
					outx &= ~0x7ff;

#ifdef DBG_BRR
					logerror("V%d: invalid range! (%X)\n", v, vp->range);
#endif
				}

#ifdef DBG_BRR
				logerror("V%d: shifted delta=%04X\n", v, (UINT16)outx);
#endif

				switch (vp->filter)
				{
				case 0:
					break;

				case 1:
					outx += (vp->smp1 >> 1) + ((-vp->smp1) >> 5);
					break;

				case 2:
					outx += vp->smp1 + ((-(vp->smp1 + (vp->smp1 >> 1))) >> 5) - (vp->smp2 >> 1) + (vp->smp2 >> 5);
					break;

				case 3:
					outx += vp->smp1 + ((-(vp->smp1 + (vp->smp1 << 2) + (vp->smp1 << 3))) >> 7)
							- (vp->smp2 >> 1) + ((vp->smp2 + (vp->smp2 >> 1)) >> 4);
					break;
				}

				if (outx < (signed short)0x8000)
				{
					outx = (signed short)0x8000;
				}
				else if (outx > (signed short)0x7fff)
				{
					outx = (signed short)0x7fff;
				}

#ifdef DBG_BRR
				logerror("V%d: filter + delta=%04X\n", v, (UINT16)outx);
#endif

				vp->smp2 = (signed short)vp->smp1;
				vp->smp1 = (signed short)(outx << 1);
				vp->sampbuf[vp->sampptr] = vp->smp1;

#ifdef DBG_BRR
				logerror("V%d: final output: %04X\n", v, vp->sampbuf[vp->sampptr]);
#endif

				vp->sampptr = (vp->sampptr + 1) & 3;
			}

			if (spc700->dsp_regs[0x3d] & m)
			{
#ifdef DBG_PMOD
				logerror("Noise enabled, voice %d\n", v);
#endif
				outx = (signed short)(spc700->noise_lev << 1);
			}
			else
			{
			/* Perform 4-Point Gaussian interpolation.  Take an approximation of a
            Gaussian bell-curve, and move it through the sample data at a rate
            determined by the pitch.  The sample output at any given time is
            the sum of the products of each input sample point with the value
            of the bell-curve corresponding to that point. */
			vl  = vp->mixfrac >> 4;
			vr  = ((G4[-vl-1] * vp->sampbuf[vp->sampptr]) >> 11 ) & ~1;
			vr += ((G3[-vl] * vp->sampbuf[(vp->sampptr + 1) & 3]) >> 11) & ~1;
			vr += ((G2[vl] * vp->sampbuf[(vp->sampptr + 2) & 3]) >> 11 ) & ~1;

			/* This is to do the wrapping properly.  Based on my tests with the
            SNES, it appears clipping is done only if it is the fourth addition
            that would cause a wrap.  If it has already wrapped before the
            fourth addition, it is not clipped. */
			vr  = (signed short)vr;
			vr += ((G1[vl] * vp->sampbuf[(vp->sampptr + 3) & 3]) >> 11) & ~1;

			if (vr > 32767)
				vr = 32767;
			else if (vr < -32768)
				vr = -32768;

			outx = (signed short)vr;

#ifdef DBG_INTRP
			logerror("V%d: mixfrac=%d: [%d]*%d + [%d]*%d + [%d]*%d + [%d]*%d = %d\n", v, vl,
				G1[vl],
				vp->sampbuf[(vp->sampptr + 3) & 3],
				G2[vl],
				vp->sampbuf[(vp->sampptr + 2) & 3],
				G3[-vl],
				vp->sampbuf[(vp->sampptr + 1) & 3],
				G4[-vl-1],
				vp->sampbuf[vp->sampptr],
				outx);
#endif
		}

		/* Advance the sample position for next update. */
		vp->mixfrac += vp->pitch;

		outx = ((outx * envx) >> 11) & ~1;
		spc700->dsp_regs[V + 9] = outx >> 8;

		vl = (((int)(signed char)spc700->dsp_regs[V    ]) * outx) >> 7;
		vr = (((int)(signed char)spc700->dsp_regs[V + 1]) * outx) >> 7;
		outl += vl;
		outr += vr;

		if (spc700->dsp_regs[0x4d] & m)
		{
#ifndef NO_ECHO
			echol += vl;
			echor += vr;
#endif
		}
	}

	outl = (outl * (signed char)spc700->dsp_regs[0x0c]) >> 7;
	outr = (outr * (signed char)spc700->dsp_regs[0x1c]) >> 7;

#ifndef NO_ECHO
	/* Perform echo.  First, read mem at current location, and put those samples
    into the FIR filter queue. */
#ifdef DBG_ECHO
	logerror("Echo delay=%dms, feedback=%d%%\n", spc700->dsp_regs[0x7d] * 16,
		((signed char)spc700->dsp_regs[0x0d] * 100) / 0x7f);
#endif

	echo_base = ((spc700->dsp_regs[0x6d] << 8) + spc700->echo_ptr) & 0xffff;
	spc700->fir_lbuf[spc700->fir_ptr] = (signed short)LEtoME16(*(UINT16 *)&spc700->ram[echo_base]);
	spc700->fir_rbuf[spc700->fir_ptr] = (signed short)LEtoME16(*(UINT16 *)&spc700->ram[echo_base + sizeof(short)]);

	/* Now, evaluate the FIR filter, and add the results into the final output. */
	vl = spc700->fir_lbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x7f];
	vr = spc700->fir_rbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x7f];
	spc700->fir_ptr = (spc700->fir_ptr + 1) & 7;
	vl += spc700->fir_lbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x6f];
	vr += spc700->fir_rbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x6f];
	spc700->fir_ptr = (spc700->fir_ptr + 1) & 7;
	vl += spc700->fir_lbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x5f];
	vr += spc700->fir_rbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x5f];
	spc700->fir_ptr = (spc700->fir_ptr + 1) & 7;
	vl += spc700->fir_lbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x4f];
	vr += spc700->fir_rbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x4f];
	spc700->fir_ptr = (spc700->fir_ptr + 1) & 7;
	vl += spc700->fir_lbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x3f];
	vr += spc700->fir_rbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x3f];
	spc700->fir_ptr = (spc700->fir_ptr + 1) & 7;
	vl += spc700->fir_lbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x2f];
	vr += spc700->fir_rbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x2f];
	spc700->fir_ptr = (spc700->fir_ptr + 1) & 7;
	vl += spc700->fir_lbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x1f];
	vr += spc700->fir_rbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x1f];
	spc700->fir_ptr = (spc700->fir_ptr + 1) & 7;
	vl += spc700->fir_lbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x0f];
	vr += spc700->fir_rbuf[spc700->fir_ptr] * (signed char)spc700->dsp_regs[0x0f];

#ifdef DBG_ECHO
	logerror("FIR Coefficients: %02X %02X %02X %02X %02X %02X %02X %02X\n",
		spc700->dsp_regs[0x0f],
		spc700->dsp_regs[0x1f],
		spc700->dsp_regs[0x2f],
		spc700->dsp_regs[0x3f],
		spc700->dsp_regs[0x4f],
		spc700->dsp_regs[0x5f],
		spc700->dsp_regs[0x6f],
		spc700->dsp_regs[0x7f]);
#endif

	/* FIR_ptr is left in the position of the oldest sample, the one that will be replaced next update. */
	outl += vl * (signed char)spc700->dsp_regs[0x2c] >> 14;
	outr += vr * (signed char)spc700->dsp_regs[0x3c] >> 14;

	if (!(spc700->dsp_regs[0x6c] & 0x20))
	{
		/* Add the echo feedback back into the original result, and save that into memory for use later. */
		echol += vl * (signed char)spc700->dsp_regs[0x0d] >> 14;

		if (echol > 32767)
			echol = 32767;
		else if (echol < -32768)
			echol = -32768;

		echor += vr * (signed char)spc700->dsp_regs[0x0D ] >> 14;

		if (echor > 32767)
			echor = 32767;
		else if (echor < -32768)
			echor = -32768;

#ifdef DBG_ECHO
		logerror("Echo: Writing %04X,%04X at location %04X\n", (UINT16)echol, (UINT16)echor, echo_base);
#endif

		*(UINT16 *)&spc700->ram[echo_base]                 = MEtoLE16((UINT16)echol);
		*(UINT16 *)&spc700->ram[echo_base + sizeof(short)] = MEtoLE16((UINT16)echor);
	}

	spc700->echo_ptr += 2 * sizeof(short);

	if (spc700->echo_ptr >= ((spc700->dsp_regs[0x7d] & 0x0f) << 11))
	{
		spc700->echo_ptr = 0;
	}
#endif                              /* !defined( NO_ECHO ) */

	if (sound_ptr != NULL)
	{
		if (spc700->dsp_regs[0x6c] & 0x40)
		{
			/* MUTE */
#ifdef DEBUG
			logerror("MUTED!\n");
#endif

			*sound_ptr = 0;
			sound_ptr++;
			*sound_ptr = 0;
			sound_ptr++;
		}
		else
		{
			if (outl > 32767)
		            *sound_ptr = 32767;
			else if (outl < -32768)
				*sound_ptr = -32768;
			else
				*sound_ptr = outl;

			sound_ptr++;

			if (outr > 32767)
		            *sound_ptr = 32767;
			else if (outr < -32768)
				*sound_ptr = -32768;
			else
				*sound_ptr = outr;

			sound_ptr++;
		}
	}
}


/*-------------------------------------------------
 advance_envelope

 Run envelope step & return ENVX. v is the voice
 to process envelope for.
-------------------------------------------------*/

static int advance_envelope( device_t *device, int v )
{
	snes_sound_state *spc700 = get_safe_token(device);
	int envx;
	int cnt;
	int adsr1;
	int t;

	envx = spc700->voice_state[v].envx;

	if (spc700->voice_state[v].envstate == RELEASE)
	{
		/* Docs: "When in the state of "key off". the "click" sound is prevented
        by the addition of the fixed value 1/256"  WTF???  Alright, I'm going
        to choose to interpret that this way:  When a note is keyed off, start
        the RELEASE state, which subtracts 1/256th each sample period (32kHz).
        Note there's no need for a count because it always happens every
        update. */
		envx -= 0x8;                    /* 0x8 / 0x800 = 1/256th        */
		if (envx <= 0)
		{
			envx = 0;
			spc700->keys &= ~(1 << v);
			return -1;
		}

		spc700->voice_state[v].envx = envx;
		spc700->dsp_regs[(v << 4) + 8] = envx >> 8;

#ifdef DBG_ENV
		logerror("ENV voice %d: envx=%03X, state=RELEASE\n", v, envx);
#endif

		return envx;
	}

	cnt = spc700->voice_state[v].envcnt;
	adsr1 = spc700->dsp_regs[(v << 4) + 5];

	if (adsr1 & 0x80)
	{
		switch (spc700->voice_state[v].envstate)
		{
		case ATTACK:
			/* Docs are very confusing.  "AR is multiplied by the fixed value
            1/64..."  I believe it means to add 1/64th to ENVX once every
            time ATTACK is updated, and that's what I'm going to implement. */
			t = adsr1 & 0x0f;

	            if (t == 0x0f)
			{
#ifdef DBG_ENV
				logerror("ENV voice %d: instant attack\n", v);
#endif

				envx += 0x400;
			}
			else
			{
				cnt -= ENVCNT[(t << 1) + 1];

				if (cnt > 0)
					break;

				envx += 0x20;       /* 0x020 / 0x800 = 1/64         */
				cnt   = CNT_INIT;
			}

			if (envx > 0x7ff)
			{
				envx = 0x7ff;
				spc700->voice_state[v].envstate = DECAY;
			}

#ifdef DBG_ENV
			logerror("ENV voice %d: envx=%03X, state=ATTACK\n", v, envx);
#endif

			spc700->voice_state[v].envx = envx;
			break;

		case DECAY:
			/* Docs: "DR... [is multiplied] by the fixed value 1-1/256."
            Well, at least that makes some sense.  Multiplying ENVX by
            255/256 every time DECAY is updated. */
			cnt -= ENVCNT[((adsr1 >> 3) & 0x0e) + 0x10];

			if (cnt <= 0)
			{
				cnt   = CNT_INIT;
				envx -= ((envx - 1) >> 8) + 1;
				spc700->voice_state[v].envx = envx;
			}

			if (envx <= 0x100 * (SL(v) + 1))
				spc700->voice_state[v].envstate = SUSTAIN;

#ifdef DBG_ENV
			logerror("ENV voice %d: envx=%03X, state=DECAY\n", v, envx);
#endif

			break;

		case SUSTAIN:
			/* Docs: "SR [is multiplied] by the fixed value 1-1/256."
            Multiplying ENVX by 255/256 every time SUSTAIN is updated. */
#ifdef DBG_ENV
			if (ENVCNT[SR(v)] == 0)
				logerror("ENV voice %d: envx=%03X, state=SUSTAIN, zero rate\n", v, envx);
#endif

			cnt -= ENVCNT[SR(v)];
			if (cnt > 0)
				break;

			cnt   = CNT_INIT;
			envx -= ((envx - 1) >> 8) + 1;

#ifdef DBG_ENV
			logerror("ENV voice %d: envx=%03X, state=SUSTAIN\n", v, envx);
#endif

			spc700->voice_state[v].envx = envx;

			/* Note: no way out of this state except by explicit KEY OFF (or switch to GAIN). */
			break;

		case RELEASE:   /* Handled earlier to prevent GAIN mode from stopping KEY OFF events */
			break;
		}
	}
	else
	{
		/* GAIN mode is set
        Note: if the game switches between ADSR and GAIN modes partway
        through, should the count be reset, or should it continue from
        where it was?  Does the DSP actually watch for that bit to
        change, or does it just go along with whatever it sees when it
        performs the update?  I'm going to assume the latter and not
        update the count, unless I see a game that obviously wants the
        other behavior.  The effect would be pretty subtle, in any case.
        */
		t = spc700->dsp_regs[(v << 4) + 7];

		if (t < 0x80)
		{
			envx = t << 4;
			spc700->voice_state[v].envx = envx;

#ifdef DBG_ENV
			logerror("ENV voice %d: envx=%03X, state=DIRECT\n", v, envx);
#endif
		}
		else
		{
			switch (t >> 5)
			{
			case 4:
				/* Docs: "Decrease (linear): Subtraction of the fixed value 1/64." */
				cnt -= ENVCNT[t & 0x1f];

				if (cnt > 0)
					break;

				cnt   = CNT_INIT;
				envx -= 0x020;      /* 0x020 / 0x800 = 1/64th       */

				if (envx < 0)
					envx = 0;

#ifdef DBG_ENV
				logerror("ENV voice %d: envx=%03X, state=DECREASE\n", v, envx);
#endif

				spc700->voice_state[v].envx = envx;
				break;

			case 5:
				/* Docs: "Drecrease <sic> (exponential): Multiplication by the fixed value 1-1/256." */
				cnt -= ENVCNT[t & 0x1f];

				if (cnt > 0)
					break;

				cnt = CNT_INIT;
				envx -= ((envx - 1) >> 8) + 1;

#ifdef DBG_ENV
				logerror("ENV voice %d: envx=%03X, state=EXP\n", v, envx);
#endif

				spc700->voice_state[v].envx = envx;
				break;

			case 6:
				/* Docs: "Increase (linear): Addition of the fixed value 1/64." */
				cnt -= ENVCNT[t & 0x1f];

				if (cnt > 0)
					break;

				cnt = CNT_INIT;
				envx += 0x020;      /* 0x020 / 0x800 = 1/64th   */
				if (envx > 0x7ff)
					envx = 0x7ff;

#ifdef DBG_ENV
				logerror("ENV voice %d: envx=%03X, state=INCREASE\n", v, envx);
#endif

				spc700->voice_state[v].envx = envx;
				break;

			case 7:
				/* Docs: "Increase (bent line): Addition of the constant
                     1/64 up to .75 of the constaint <sic> 1/256 from .75 to 1." */
				cnt -= ENVCNT[t & 0x1f];

				if (cnt > 0)
					break;

				cnt = CNT_INIT;

				if (envx < 0x600)  /* 0x600 / 0x800 = .75          */
					envx += 0x020;  /* 0x020 / 0x800 = 1/64         */
				else
					envx += 0x008;  /* 0x008 / 0x800 = 1/256        */

				if (envx > 0x7ff)
					envx=0x7ff;

#ifdef DBG_ENV
				logerror("ENV voice %d: envx=%03X, state=INCREASE\n", v, envx);
#endif

				spc700->voice_state[v].envx = envx;
				break;
			}
		}
	}

	spc700->voice_state[v].envcnt = cnt;
	spc700->dsp_regs[(v << 4) + 8] = envx >> 4;

	return envx;
}


static TIMER_CALLBACK( snes_spc_timer  )
{
	snes_sound_state *spc700 = (snes_sound_state *)ptr;
	int which = param;

	spc700->counter[which]++;
	if (spc700->counter[which] >= spc700->ram[0xfa + which] ) // minus =
	{
		spc700->counter[which] = 0;
		spc700->ram[0xfd + which]++;
		spc700->ram[0xfd + which] &= 0x0f;
	}
}

static STREAM_UPDATE( snes_sh_update )
{
	int i;
	short mix[2];

	for (i = 0; i < samples; i++)
	{
		mix[0] = mix[1] = 0;
		dsp_update(device, mix);

		/* Update the buffers */
		outputs[0][i] = (stream_sample_t)mix[0];
		outputs[1][i] = (stream_sample_t)mix[1];
	}
}


/***************************
         I/O for DSP
 ***************************/

static READ8_DEVICE_HANDLER( snes_dsp_io_r )
{
	snes_sound_state *spc700 = get_safe_token(device);

	spc700->channel->update();

#ifdef NO_ENVX
	if (8 == (spc700->ram[0xf2] & 0x0f))
		spc700->dsp_regs[spc700->ram[0xf2]] = 0;
#endif

	/* All reads simply return the contents of the addressed register. */
	return spc700->dsp_regs[offset & 0x7f];
}

static WRITE8_DEVICE_HANDLER( snes_dsp_io_w )
{
	snes_sound_state *spc700 = get_safe_token(device);

	spc700->channel->update();

	if (offset == 0x7c)
	{
		/* Writes to register 0x7c (ENDX) clear ALL bits no matter which value is written */
		spc700->dsp_regs[offset] = 0;
	}
	else
	{
		/* All other writes store the value in the addressed register as expected. */
		spc700->dsp_regs[offset] = data;
	}
}

/***************************
       I/O for SPC700
 ***************************/

READ8_DEVICE_HANDLER( spc_io_r )
{
	snes_sound_state *spc700 = get_safe_token(device);

	switch (offset)	/* Offset is from 0x00f0 */
	{
		case 0x0: //FIXME: Super Bomberman PBW reads from there, is it really write-only?
			return 0;
		case 0x1:
			return 0; //Super Kick Boxing reads port 1 and wants it to be zero.
		case 0x2:		/* Register address */
			return spc700->ram[0xf2];
		case 0x3:		/* Register data */
			return snes_dsp_io_r(device, spc700->ram[0xf2]);
		case 0x4:		/* Port 0 */
		case 0x5:		/* Port 1 */
		case 0x6:		/* Port 2 */
		case 0x7:		/* Port 3 */
			// mame_printf_debug("SPC: rd %02x @ %d, PC=%x\n", spc700->port_in[offset - 4], offset - 4, cpu_get_pc(&space->device()));
			return spc700->port_in[offset - 4];
		case 0x8: //normal RAM, can be read even if the ram disabled flag ($f0 bit 1) is active
		case 0x9:
			return spc700->ram[0xf0 + offset];
		case 0xa:		/* Timer 0 */
		case 0xb:		/* Timer 1 */
		case 0xc:		/* Timer 2 */
			break;
		case 0xd:		/* Counter 0 */
		case 0xe:		/* Counter 1 */
		case 0xf:		/* Counter 2 */
		{
			UINT8 value = spc700->ram[0xf0 + offset] & 0x0f;
			spc700->ram[0xf0 + offset] = 0;
			return value;
		}
	}

	return 0;
}

WRITE8_DEVICE_HANDLER( spc_io_w )
{
	snes_sound_state *spc700 = get_safe_token(device);
	int i;

	switch (offset)	/* Offset is from 0x00f0 */
	{
		case 0x0:
			printf("Warning: write to SOUND TEST register with data %02x!\n", data);
			break;
		case 0x1:		/* Control */
			for (i = 0; i < 3; i++)
			{
				if (BIT(data, i) && !spc700->enabled[i])
				{
					spc700->counter[i] = 0;
					spc700->ram[0xfd + i] = 0;
				}

				spc700->enabled[i] = BIT(data, i);
				spc700->timer[i]->enable(spc700->enabled[i]);
			}

			if (BIT(data, 4))
			{
				spc700->port_in[0] = 0;
				spc700->port_in[1] = 0;
			}

			if (BIT(data, 5))
			{
				spc700->port_in[2] = 0;
				spc700->port_in[3] = 0;
			}

			if ((data & 0x80) != (spc700->ram[0xf1] & 0x80))
			{
				if (data & 0x80)
					memcpy(spc700->ipl_region, device->machine().region("user5")->base(), 64);
				else
					memcpy(spc700->ipl_region, &spc700->ram[0xffc0], 64);
			}
			break;
		case 0x2:		/* Register address */
			break;
		case 0x3:		/* Register data - 0x80-0xff is a read-only mirror of 0x00-0x7f */
			if (!(spc700->ram[0xf2] & 0x80))
				snes_dsp_io_w(device, spc700->ram[0xf2] & 0x7f, data);
			break;
		case 0x4:		/* Port 0 */
		case 0x5:		/* Port 1 */
		case 0x6:		/* Port 2 */
		case 0x7:		/* Port 3 */
			// mame_printf_debug("SPC: %02x to APU @ %d (PC=%x)\n", data, offset & 3, cpu_get_pc(&space->device()));
			spc700->port_out[offset - 4] = data;
			device->machine().scheduler().boost_interleave(attotime::zero, attotime::from_usec(20));
			break;
		case 0xa:		/* Timer 0 */
		case 0xb:		/* Timer 1 */
		case 0xc:		/* Timer 2 */
			if (data == 0)
				data = 255;
			break;
		case 0xd:		/* Counter 0 */
		case 0xe:		/* Counter 1 */
		case 0xf:		/* Counter 2 */
			return;
	}

	spc700->ram[0xf0 + offset] = data;
}

READ8_DEVICE_HANDLER( spc_ram_r )
{
	snes_sound_state *spc700 = get_safe_token(device);
	return spc700->ram[offset];
}

WRITE8_DEVICE_HANDLER( spc_ram_w )
{
	snes_sound_state *spc700 = get_safe_token(device);

	spc700->ram[offset] = data;

	/* if RAM is mapped in, mirror accordingly */
	if ((!(spc700->ram[0xf1] & 0x80)) && (offset >= 0xffc0))
		spc700->ipl_region[offset - 0xffc0] = data;
}

READ8_DEVICE_HANDLER( spc_ipl_r )
{
	snes_sound_state *spc700 = get_safe_token(device);
	return spc700->ipl_region[offset];
}


READ8_DEVICE_HANDLER( spc_port_out )
{
	snes_sound_state *spc700 = get_safe_token(device);

	assert(offset < 4);

	return spc700->port_out[offset];
}

WRITE8_DEVICE_HANDLER( spc_port_in )
{
	snes_sound_state *spc700 = get_safe_token(device);

	assert(offset < 4);

	spc700->port_in[offset] = data;
}

UINT8 *spc_get_ram( device_t *device )
{
	snes_sound_state *spc700 = get_safe_token(device);

	return spc700->ram;
}

/*****************************************************************************
    DEVICE INTERFACE
*****************************************************************************/

static void state_register( device_t *device )
{
	snes_sound_state *spc700 = get_safe_token(device);
	int v;

	device->save_item(NAME(spc700->dsp_regs));
	device->save_item(NAME(spc700->ipl_region));

	device->save_item(NAME(spc700->keyed_on));
	device->save_item(NAME(spc700->keys));

	device->save_item(NAME(spc700->noise_cnt));
	device->save_item(NAME(spc700->noise_lev));

#ifndef NO_ECHO
	device->save_item(NAME(spc700->fir_lbuf));
	device->save_item(NAME(spc700->fir_rbuf));
	device->save_item(NAME(spc700->fir_ptr));
	device->save_item(NAME(spc700->echo_ptr));
#endif

	device->save_item(NAME(spc700->enabled));
	device->save_item(NAME(spc700->counter));
	device->save_item(NAME(spc700->port_in));
	device->save_item(NAME(spc700->port_out));

	for (v = 0; v < 8; v++)
	{
		device->save_item(NAME(spc700->voice_state[v].mem_ptr), v);
		device->save_item(NAME(spc700->voice_state[v].end), v);
		device->save_item(NAME(spc700->voice_state[v].envcnt), v);
		device->save_item(NAME(spc700->voice_state[v].envstate), v);
		device->save_item(NAME(spc700->voice_state[v].envx), v);
		device->save_item(NAME(spc700->voice_state[v].filter), v);
		device->save_item(NAME(spc700->voice_state[v].half), v);
		device->save_item(NAME(spc700->voice_state[v].header_cnt), v);
		device->save_item(NAME(spc700->voice_state[v].mixfrac), v);
		device->save_item(NAME(spc700->voice_state[v].on_cnt), v);
		device->save_item(NAME(spc700->voice_state[v].pitch), v);
		device->save_item(NAME(spc700->voice_state[v].range), v);
		device->save_item(NAME(spc700->voice_state[v].samp_id), v);
		device->save_item(NAME(spc700->voice_state[v].sampptr), v);
		device->save_item(NAME(spc700->voice_state[v].smp1), v);
		device->save_item(NAME(spc700->voice_state[v].smp2), v);
		device->save_item(NAME(spc700->voice_state[v].sampbuf), v);
	}
}

static DEVICE_START( snes_sound )
{
	snes_sound_state *spc700 = get_safe_token(device);
	running_machine &machine = device->machine();

	spc700->channel = device->machine().sound().stream_alloc(*device, 0, 2, 32000, 0, snes_sh_update);

	spc700->ram = auto_alloc_array_clear(device->machine(), UINT8, SNES_SPCRAM_SIZE);

	/* default to ROM visible */
	spc700->ram[0xf1] = 0x80;

	/* put IPL image at the top of RAM */
	memcpy(spc700->ipl_region, machine.region("user5")->base(), 64);

	/* Initialize the timers */
	spc700->timer[0] = machine.scheduler().timer_alloc(FUNC(snes_spc_timer), spc700);
	spc700->timer[0]->adjust(attotime::from_hz(8000),  0, attotime::from_hz(8000));
	spc700->timer[0]->enable(false);
	spc700->timer[1] = machine.scheduler().timer_alloc(FUNC(snes_spc_timer), spc700);
	spc700->timer[1]->adjust(attotime::from_hz(8000),  1, attotime::from_hz(8000));
	spc700->timer[1]->enable(false);
	spc700->timer[2] = machine.scheduler().timer_alloc(FUNC(snes_spc_timer), spc700);
	spc700->timer[2]->adjust(attotime::from_hz(64000), 2, attotime::from_hz(64000));
	spc700->timer[2]->enable(false);

	state_register(device);
	device->save_pointer(NAME(spc700->ram), SNES_SPCRAM_SIZE);
}

static DEVICE_RESET( snes_sound )
{
	snes_sound_state *spc700 = get_safe_token(device);
	int ii;

	/* Sort out the ports */
	for (ii = 0; ii < 4; ii++)
	{
		spc700->port_in[ii] = 0;
		spc700->port_out[ii] = 0;
	}

	dsp_reset(device);
}

/*-------------------------------------------------
 Device definition
-------------------------------------------------*/

static const char DEVTEMPLATE_SOURCE[] = __FILE__;

#define DEVTEMPLATE_ID(p,s)				p##snes_sound##s
#define DEVTEMPLATE_FEATURES			DT_HAS_START | DT_HAS_RESET
#define DEVTEMPLATE_NAME				"SNES Custom DSP (SPC700)"
#define DEVTEMPLATE_FAMILY				"SNES Custom"
#include "devtempl.h"


DEFINE_LEGACY_SOUND_DEVICE(SNES, snes_sound);
