pokeysnd.c

wince下著名的视频播放器源码

/*
 * pokeysnd.c - POKEY sound chip emulation, v2.4
 *
 * Copyright (C) 1996-1998 Ron Fries
 * Copyright (C) 1998-2006 Atari800 development team (see DOC/CREDITS)
 *
 * This file is part of the Atari800 emulator project which emulates
 * the Atari 400, 800, 800XL, 130XE, and 5200 8-bit computers.
 *
 * Atari800 is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Atari800 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Atari800; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include "config.h"

#ifdef ASAP /* external project, see http://asap.sf.net */
#include "asap_internal.h"
#else
#include "atari.h"
#ifndef __PLUS
#include "sndsave.h"
#else
#include "sound_win.h"
#endif
#endif
#include "mzpokeysnd.h"
#include "pokeysnd.h"

#ifdef WORDS_UNALIGNED_OK
#  define READ_U32(x)     (*(uint32 *) (x))
#  define WRITE_U32(x, d) (*(uint32 *) (x) = (d))
#else
#  ifdef WORDS_BIGENDIAN
#    define READ_U32(x) (((*(unsigned char *)(x)) << 24) | ((*((unsigned char *)(x) + 1)) << 16) | \
                        ((*((unsigned char *)(x) + 2)) << 8) | ((*((unsigned char *)(x) + 3))))
#    define WRITE_U32(x, d) \
  { \
  uint32 i = d; \
  (*(unsigned char *) (x)) = (((i) >> 24) & 255); \
  (*((unsigned char *) (x) + 1)) = (((i) >> 16) & 255); \
  (*((unsigned char *) (x) + 2)) = (((i) >> 8) & 255); \
  (*((unsigned char *) (x) + 3)) = ((i) & 255); \
  }
#  else
#    define READ_U32(x) ((*(unsigned char *) (x)) | ((*((unsigned char *) (x) + 1)) << 8) | \
                        ((*((unsigned char *) (x) + 2)) << 16) | ((*((unsigned char *) (x) + 3)) << 24))
#    define WRITE_U32(x, d) \
  { \
  uint32 i = d; \
  (*(unsigned char *)(x)) = ((i) & 255); \
  (*((unsigned char *)(x) + 1)) = (((i) >> 8) & 255); \
  (*((unsigned char *)(x) + 2)) = (((i) >> 16) & 255); \
  (*((unsigned char *)(x) + 3)) = (((i) >> 24) & 255); \
  }
#  endif
#endif

/* GLOBAL VARIABLE DEFINITIONS */

/* number of pokey chips currently emulated */
static uint8 Num_pokeys;

static uint8 AUDV[4 * MAXPOKEYS];	/* Channel volume - derived */

static uint8 Outbit[4 * MAXPOKEYS];		/* current state of the output (high or low) */

static uint8 Outvol[4 * MAXPOKEYS];		/* last output volume for each channel */

/* Initialze the bit patterns for the polynomials. */

/* The 4bit and 5bit patterns are the identical ones used in the pokey chip. */
/* Though the patterns could be packed with 8 bits per byte, using only a */
/* single bit per byte keeps the math simple, which is important for */
/* efficient processing. */

static uint8 bit4[POLY4_SIZE] =
#ifndef POKEY23_POLY
{1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0};	/* new table invented by Perry */
#else
{1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0};	/* original POKEY 2.3 table */
#endif

static uint8 bit5[POLY5_SIZE] =
#ifndef POKEY23_POLY
{1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0};
#else
{0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1};
#endif

static uint32 P4 = 0,			/* Global position pointer for the 4-bit  POLY array */
 P5 = 0,						/* Global position pointer for the 5-bit  POLY array */
 P9 = 0,						/* Global position pointer for the 9-bit  POLY array */
 P17 = 0;						/* Global position pointer for the 17-bit POLY array */

static uint32 Div_n_cnt[4 * MAXPOKEYS],		/* Divide by n counter. one for each channel */
 Div_n_max[4 * MAXPOKEYS];		/* Divide by n maximum, one for each channel */

static uint32 Samp_n_max,		/* Sample max.  For accuracy, it is *256 */
 Samp_n_cnt[2];					/* Sample cnt. */

extern int atari_speaker;

#ifdef INTERPOLATE_SOUND
static uint16 last_val = 0;		/* last output value */
#ifdef STEREO_SOUND
static uint16 last_val2 = 0;	/* last output value */
#endif
#endif

/* Volume only emulations declarations */
#ifdef VOL_ONLY_SOUND

#define	SAMPBUF_MAX	2000
int	sampbuf_val[SAMPBUF_MAX];	/* volume values */
int	sampbuf_cnt[SAMPBUF_MAX];	/* relative start time */
int	sampbuf_ptr = 0;		/* pointer to sampbuf */
int	sampbuf_rptr = 0;		/* pointer to read from sampbuf */
int	sampbuf_last = 0;		/* last absolute time */
int	sampbuf_AUDV[4 * MAXPOKEYS];	/* prev. channel volume */
int	sampbuf_lastval = 0;		/* last volume */
int	sampout;			/* last out volume */
uint16 samp_freq;
int	samp_consol_val = 0;		/* actual value of console sound */
#ifdef STEREO_SOUND
int	sampbuf_val2[SAMPBUF_MAX];	/* volume values */
int	sampbuf_cnt2[SAMPBUF_MAX];	/* relative start time */
int	sampbuf_ptr2 = 0;		/* pointer to sampbuf */
int	sampbuf_rptr2 = 0;		/* pointer to read from sampbuf */
int	sampbuf_last2 = 0;		/* last absolute time */
int	sampbuf_lastval2 = 0;		/* last volume */
int	sampout2;			/* last out volume */
#endif
#endif  /* VOL_ONLY_SOUND */

static uint32 snd_freq17 = FREQ_17_EXACT;
int32 snd_playback_freq = 44100;
uint8 snd_num_pokeys = 1;
static int snd_flags = 0;
static int mz_quality = 0;		/* default quality for mzpokeysnd */
#ifdef __PLUS
int mz_clear_regs = 0;
#endif

int enable_new_pokey = TRUE;
#ifndef ASAP
int stereo_enabled = FALSE;
#endif

/* multiple sound engine interface */
static void Pokey_process_8(void *sndbuffer, unsigned sndn);
static void Pokey_process_16(void *sndbuffer, unsigned sndn);
static void null_pokey_process(void *sndbuffer, unsigned int sndn) {}
void (*Pokey_process_ptr)(void *sndbuffer, unsigned int sndn) = null_pokey_process;

static void Update_pokey_sound_rf(uint16, uint8, uint8, uint8);
static void null_pokey_sound(uint16 addr, uint8 val, uint8 chip, uint8 gain) {}
void (*Update_pokey_sound) (uint16 addr, uint8 val, uint8 chip, uint8 gain)
  = null_pokey_sound;

#ifdef SERIO_SOUND
static void Update_serio_sound_rf(int out, UBYTE data);
static void null_serio_sound(int out, UBYTE data) {}
void (*Update_serio_sound)(int out, UBYTE data) = null_serio_sound;
int serio_sound_enabled = 1;
#endif

#ifdef CONSOLE_SOUND
static void Update_consol_sound_rf(int set);
static void null_consol_sound(int set) {}
void (*Update_consol_sound)(int set) = null_consol_sound;
int console_sound_enabled = 1;
#endif

#ifdef VOL_ONLY_SOUND
static void Update_vol_only_sound_rf(void);
static void null_vol_only_sound(void) {}
void (*Update_vol_only_sound)(void) = null_vol_only_sound;
#endif

/*****************************************************************************/
/* In my routines, I treat the sample output as another divide by N counter  */
/* For better accuracy, the Samp_n_cnt has a fixed binary decimal point      */
/* which has 8 binary digits to the right of the decimal point.  I use a two */
/* byte array to give me a minimum of 40 bits, and then use pointer math to  */
/* reference either the 24.8 whole/fraction combination or the 32-bit whole  */
/* only number.  This is mainly used to keep the math simple for             */
/* optimization. See below:                                                  */
/*                                                                           */
/* Representation on little-endian machines:                                 */
/* xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx */
/* fraction   whole    whole    whole      whole   unused   unused   unused  */
/*                                                                           */
/* Samp_n_cnt[0] gives me a 32-bit int 24 whole bits with 8 fractional bits, */
/* while (uint32 *)((uint8 *)(&Samp_n_cnt[0])+1) gives me the 32-bit whole   */
/* number only.                                                              */
/*                                                                           */
/* Representation on big-endian machines:                                    */
/* xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | xxxxxxxx xxxxxxxx xxxxxxxx.xxxxxxxx */
/*  unused   unused   unused    whole      whole    whole    whole  fraction */
/*                                                                           */
/* Samp_n_cnt[1] gives me a 32-bit int 24 whole bits with 8 fractional bits, */
/* while (uint32 *)((uint8 *)(&Samp_n_cnt[0])+3) gives me the 32-bit whole   */
/* number only.                                                              */
/*****************************************************************************/


/*****************************************************************************/
/* Module:  Pokey_sound_init()                                               */
/* Purpose: to handle the power-up initialization functions                  */
/*          these functions should only be executed on a cold-restart        */
/*                                                                           */
/* Author:  Ron Fries                                                        */
/* Date:    January 1, 1997                                                  */
/*                                                                           */
/* Inputs:  freq17 - the value for the '1.79MHz' Pokey audio clock           */
/*          playback_freq - the playback frequency in samples per second     */
/*          num_pokeys - specifies the number of pokey chips to be emulated  */
/*                                                                           */
/* Outputs: Adjusts local globals - no return value                          */
/*                                                                           */
/*****************************************************************************/

static int Pokey_sound_init_rf(uint32 freq17, uint16 playback_freq,
           uint8 num_pokeys, unsigned int flags);

int Pokey_DoInit(void)
{
	if (enable_new_pokey)
		return Pokey_sound_init_mz(snd_freq17, (uint16) snd_playback_freq,
				snd_num_pokeys, snd_flags, mz_quality
#ifdef __PLUS
				, mz_clear_regs
#endif
		);
	else
		return Pokey_sound_init_rf(snd_freq17, (uint16) snd_playback_freq,
				snd_num_pokeys, snd_flags);
}

int Pokey_sound_init(uint32 freq17, uint16 playback_freq, uint8 num_pokeys,
                     unsigned int flags
#ifdef __PLUS
                     , int clear_regs
#endif
)
{
	snd_freq17 = freq17;
	snd_playback_freq = playback_freq;
	snd_num_pokeys = num_pokeys;
	snd_flags = flags;
#ifdef __PLUS
	mz_clear_regs = clear_regs;
#endif

	return Pokey_DoInit();
}

void Pokey_set_mzquality(int quality)	/* specially for win32, perhaps not needed? */
{
	mz_quality = quality;
}

void Pokey_process(void *sndbuffer, unsigned int sndn)
{
	Pokey_process_ptr(sndbuffer, sndn);
#if !defined(__PLUS) && !defined(ASAP)
	WriteToSoundFile(sndbuffer, sndn);
#endif
}

static int Pokey_sound_init_rf(uint32 freq17, uint16 playback_freq,
           uint8 num_pokeys, unsigned int flags)
{
	uint8 chan;

	Update_pokey_sound = Update_pokey_sound_rf;
#ifdef SERIO_SOUND
	Update_serio_sound = Update_serio_sound_rf;
#endif
#ifdef CONSOLE_SOUND
	Update_consol_sound = Update_consol_sound_rf;
#endif
#ifdef VOL_ONLY_SOUND
	Update_vol_only_sound = Update_vol_only_sound_rf;
#endif

	Pokey_process_ptr = (flags & SND_BIT16) ? Pokey_process_16 : Pokey_process_8;

#ifdef VOL_ONLY_SOUND
	samp_freq = playback_freq;
#endif

	/* start all of the polynomial counters at zero */
	P4 = 0;
	P5 = 0;
	P9 = 0;
	P17 = 0;

	/* calculate the sample 'divide by N' value based on the playback freq. */
	Samp_n_max = ((uint32) freq17 << 8) / playback_freq;

	Samp_n_cnt[0] = 0;			/* initialize all bits of the sample */
	Samp_n_cnt[1] = 0;			/* 'divide by N' counter */

	for (chan = 0; chan < (MAXPOKEYS * 4); chan++) {
		Outvol[chan] = 0;
		Outbit[chan] = 0;
		Div_n_cnt[chan] = 0;
		Div_n_max[chan] = 0x7fffffffL;
		AUDV[chan] = 0;
#ifdef VOL_ONLY_SOUND
		sampbuf_AUDV[chan] = 0;
#endif
	}

	/* set the number of pokey chips currently emulated */
	Num_pokeys = num_pokeys;

	return 0; /* OK */
}


/*****************************************************************************/
/* Module:  Update_pokey_sound()                                             */
/* Purpose: To process the latest control values stored in the AUDF, AUDC,   */
/*          and AUDCTL registers.  It pre-calculates as much information as  */
/*          possible for better performance.  This routine has not been      */
/*          optimized.                                                       */
/*                                                                           */
/* Author:  Ron Fries                                                        */
/* Date:    January 1, 1997                                                  */
/*                                                                           */
/* Inputs:  addr - the address of the parameter to be changed                */
/*          val - the new value to be placed in the specified address        */
/*          gain - specified as an 8-bit fixed point number - use 1 for no   */
/*                 amplification (output is multiplied by gain)              */
/*                                                                           */
/* Outputs: Adjusts local globals - no return value                          */
/*                                                                           */
/*****************************************************************************/

static void Update_pokey_sound_rf(uint16 addr, uint8 val, uint8 chip,
				  uint8 gain)
{
	uint32 new_val = 0;
	uint8 chan;
	uint8 chan_mask;
	uint8 chip_offs;

	/* calculate the chip_offs for the channel arrays */
	chip_offs = chip << 2;

	/* determine which address was changed */
	switch (addr & 0x0f) {
	case _AUDF1:
		/* AUDF[CHAN1 + chip_offs] = val; */
		chan_mask = 1 << CHAN1;
		if (AUDCTL[chip] & CH1_CH2)		/* if ch 1&2 tied together */
			chan_mask |= 1 << CHAN2;	/* then also change on ch2 */
		break;
	case _AUDC1:
		/* AUDC[CHAN1 + chip_offs] = val; */
		AUDV[CHAN1 + chip_offs] = (val & VOLUME_MASK) * gain;
		chan_mask = 1 << CHAN1;
		break;
	case _AUDF2:
		/* AUDF[CHAN2 + chip_offs] = val; */
		chan_mask = 1 << CHAN2;
		break;
	case _AUDC2:
		/* AUDC[CHAN2 + chip_offs] = val; */
		AUDV[CHAN2 + chip_offs] = (val & VOLUME_MASK) * gain;
		chan_mask = 1 << CHAN2;
		break;
	case _AUDF3:
		/* AUDF[CHAN3 + chip_offs] = val; */
		chan_mask = 1 << CHAN3;
		if (AUDCTL[chip] & CH3_CH4)		/* if ch 3&4 tied together */
			chan_mask |= 1 << CHAN4;	/* then also change on ch4 */
		break;
	case _AUDC3:
		/* AUDC[CHAN3 + chip_offs] = val; */
		AUDV[CHAN3 + chip_offs] = (val & VOLUME_MASK) * gain;
		chan_mask = 1 << CHAN3;
		break;
	case _AUDF4:
		/* AUDF[CHAN4 + chip_offs] = val; */
		chan_mask = 1 << CHAN4;
		break;
	case _AUDC4:
		/* AUDC[CHAN4 + chip_offs] = val; */
		AUDV[CHAN4 + chip_offs] = (val & VOLUME_MASK) * gain;
		chan_mask = 1 << CHAN4;
		break;
	case _AUDCTL: