kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
148 wiersze
7.0 KiB
C
148 wiersze
7.0 KiB
C
/*****************************************************************************/
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/* */
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/* Module: POKEY Chip Simulator Includes, V2.3 */
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/* Purpose: To emulate the sound generation hardware of the Atari POKEY chip. */
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/* Author: Ron Fries */
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/* */
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/* Revision History: */
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/* */
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/* 09/22/96 - Ron Fries - Initial Release */
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/* 04/06/97 - Brad Oliver - Some cross-platform modifications. Added */
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/* big/little endian #defines, removed <dos.h>, */
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/* conditional defines for TRUE/FALSE */
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/* 01/19/98 - Ron Fries - Changed signed/unsigned sample support to a */
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/* compile-time option. Defaults to unsigned - */
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/* define SIGNED_SAMPLES to create signed. */
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/* */
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/*****************************************************************************/
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/* */
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/* License Information and Copyright Notice */
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/* ======================================== */
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/* */
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/* PokeySound is Copyright(c) 1996-1998 by Ron Fries */
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/* */
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/* This library is free software; you can redistribute it and/or modify it */
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/* under the terms of version 2 of the GNU Library General Public License */
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/* as published by the Free Software Foundation. */
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/* */
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/* This library is distributed in the hope that it will be useful, but */
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/* WITHOUT ANY WARRANTY; without even the implied warranty of */
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/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library */
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/* General Public License for more details. */
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/* To obtain a copy of the GNU Library General Public License, write to the */
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/* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* */
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/* Any permitted reproduction of these routines, in whole or in part, must */
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/* bear this legend. */
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/* */
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/*****************************************************************************/
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#ifndef POKEYSND_H_
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#define POKEYSND_H_
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#include "atari.h"
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#include "pokey.h"
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/* CONSTANT DEFINITIONS */
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/* As an alternative to using the exact frequencies, selecting a playback
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frequency that is an exact division of the main clock provides a higher
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quality output due to less aliasing. For best results, a value of
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1787520 MHz is used for the main clock. With this value, both the
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64 kHz and 15 kHz clocks are evenly divisible. Selecting a playback
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frequency that is also a division of the clock provides the best
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results. The best options are FREQ_64 divided by either 2, 3, or 4.
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The best selection is based on a trade off between performance and
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sound quality.
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Of course, using a main clock frequency that is not exact will affect
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the pitch of the output. With these numbers, the pitch will be low
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by 0.127%. (More than likely, an actual unit will vary by this much!) */
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#define POKEYSND_FREQ_17_EXACT 1789790 /* exact 1.79 MHz clock freq */
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#define POKEYSND_FREQ_17_APPROX 1787520 /* approximate 1.79 MHz clock freq */
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef POKEYSND_SIGNED_SAMPLES /* if signed output selected */
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#define POKEYSND_SAMP_MAX 255 /* else set unsigned 8-bit clip ranges */
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#define POKEYSND_SAMP_MIN 0
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#define POKEYSND_SAMP_MID 128
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//#define POKEYSND_SAMP_MAX 127 /* then set signed 8-bit clipping ranges */
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//#define POKEYSND_SAMP_MIN -128
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//#define POKEYSND_SAMP_MID 0
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#else
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#define POKEYSND_SAMP_MAX 255 /* else set unsigned 8-bit clip ranges */
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#define POKEYSND_SAMP_MIN 0
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#define POKEYSND_SAMP_MID 128
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#endif
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/* init flags */
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#define POKEYSND_BIT16 1
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extern SLONG POKEYSND_playback_freq;
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extern UBYTE POKEYSND_num_pokeys;
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extern int POKEYSND_snd_flags;
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extern int POKEYSND_volume;
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extern int POKEYSND_enable_new_pokey;
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extern int POKEYSND_stereo_enabled;
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extern int POKEYSND_serio_sound_enabled;
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extern int POKEYSND_console_sound_enabled;
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extern int POKEYSND_bienias_fix;
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extern void (*POKEYSND_Process_ptr)(void *sndbuffer, int sndn);
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extern void (*POKEYSND_Update_ptr)(UWORD addr, UBYTE val, UBYTE chip, UBYTE gain);
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extern void (*POKEYSND_UpdateSerio)(int out, UBYTE data);
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extern void (*POKEYSND_UpdateConsol_ptr)(int set);
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extern void (*POKEYSND_UpdateVolOnly)(void);
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int POKEYSND_Init(ULONG freq17, int playback_freq, UBYTE num_pokeys,
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int flags
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#ifdef __PLUS
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, int clear_regs
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#endif
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);
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void POKEYSND_Update(UWORD addr, UBYTE val, UBYTE /*chip*/, UBYTE gain);
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void POKEYSND_UpdateConsol(int set);
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/* Fill sndbuffer with sndn samples of audio. Number of bytes written to
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sndbuffer is sndn with 8-bit sound, and 2*sndn with 16-bit sound. sndn
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must be a multiple of POKEYSND_num_pokeys. */
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void POKEYSND_Process(void *sndbuffer, int sndn);
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int POKEYSND_DoInit(void);
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void POKEYSND_SetMzQuality(int quality);
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void POKEYSND_SetVolume(int vol);
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/* Volume only emulations declarations */
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#ifdef VOL_ONLY_SOUND
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#define POKEYSND_SAMPBUF_MAX 2000
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extern int POKEYSND_sampbuf_val[POKEYSND_SAMPBUF_MAX]; /* volume values */
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extern int POKEYSND_sampbuf_cnt[POKEYSND_SAMPBUF_MAX]; /* relative start time */
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extern int POKEYSND_sampbuf_ptr; /* pointer to sampbuf */
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extern int POKEYSND_sampbuf_rptr; /* pointer to read from sampbuf */
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extern int POKEYSND_sampbuf_last; /* last absolute time */
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extern int POKEYSND_sampbuf_AUDV[4 * POKEY_MAXPOKEYS]; /* prev. channel volume */
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extern int POKEYSND_sampbuf_lastval; /* last volume */
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extern int POKEYSND_sampout; /* last out volume */
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extern int POKEYSND_samp_freq;
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extern int POKEYSND_samp_consol_val; /* actual value of console sound */
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#endif /* VOL_ONLY_SOUND */
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#ifdef SYNCHRONIZED_SOUND
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extern UBYTE *POKEYSND_process_buffer;
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extern unsigned int POKEYSND_process_buffer_length;
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extern unsigned int POKEYSND_process_buffer_fill;
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extern void (*POKEYSND_GenerateSync)(unsigned int num_ticks);
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int POKEYSND_UpdateProcessBuffer(void);
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#endif /* SYNCHRONIZED_SOUND */
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#ifdef __cplusplus
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}
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#endif
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#endif /* POKEYSND_H_ */
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