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221 lines
6.7 KiB
C
221 lines
6.7 KiB
C
/*
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** Nofrendo (c) 1998-2000 Matthew Conte (matt@conte.com)
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**
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of version 2 of the GNU Library General
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** Public License as published by the Free Software Foundation.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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** Library General Public License for more details. To obtain a
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** copy of the GNU Library General Public License, write to the Free
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** Software Foundation, Inc., 51 Franklin St, 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,
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** must bear this legend.
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**
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**
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** nsf.h
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**
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** NSF loading/saving related defines / prototypes
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** $Id$
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*/
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#ifndef _NSF_H_
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#define _NSF_H_
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#include "osd.h"
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#include "nes6502.h"
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#include "nes_apu.h"
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#define NSF_MAGIC "NESM\x1A"
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#define NSF_DEDICATED_PAL 0x01
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#define NSF_DUAL_PAL_NTSC 0x02
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#define EXT_SOUND_NONE 0x00
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#define EXT_SOUND_VRCVI 0x01
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#define EXT_SOUND_VRCVII 0x02
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#define EXT_SOUND_FDS 0x04
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#define EXT_SOUND_MMC5 0x08
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#define EXT_SOUND_NAMCO106 0x10
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#define EXT_SOUND_SUNSOFT_FME07 0x20
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/* bits 6,7: future expansion */
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#define NSF_HEADER_SIZE 0x80
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/* 60 Hertz refresh (NTSC) */
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#define NES_MASTER_CLOCK 21477272.7272
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#define NTSC_REFRESH 60
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#define NTSC_SUBCARRIER_DIV 12
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#define NTSC_SCANLINES 262
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#define NES_FRAME_CYCLES ((NES_MASTER_CLOCK / NTSC_SUBCARRIER_DIV) / NTSC_REFRESH)
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#define NES_SCANLINE_CYCLES (NES_FRAME_CYCLES / NTSC_SCANLINES)
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/* filter levels */
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enum
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{
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NSF_FILTER_NONE,
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NSF_FILTER_LOWPASS,
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NSF_FILTER_WEIGHTED,
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NSF_FILTER_MAX, /* $$$ ben : add this one for range chacking */
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};
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typedef struct nsf_s
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{
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/* NESM header */
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uint8 id[5] ; /* NESM\x1A */
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uint8 version ; /* spec version */
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uint8 num_songs ; /* total num songs */
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uint8 start_song ; /* first song */
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uint16 load_addr __PACKED__; /* loc to load code */
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uint16 init_addr __PACKED__; /* init call address */
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uint16 play_addr __PACKED__; /* play call address */
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uint8 song_name[32] ; /* name of song */
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uint8 artist_name[32] ; /* artist name */
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uint8 copyright[32] ; /* copyright info */
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uint16 ntsc_speed __PACKED__; /* playback speed (if NTSC) */
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uint8 bankswitch_info[8] ; /* initial code banking */
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uint16 pal_speed __PACKED__; /* playback speed (if PAL) */
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uint8 pal_ntsc_bits ; /* NTSC/PAL determination bits */
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uint8 ext_sound_type ; /* type of external sound gen. */
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uint8 reserved[4] ; /* reserved */
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/* things that the NSF player needs */
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uint8 *data; /* actual NSF data */
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uint32 length; /* length of data */
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uint32 playback_rate; /* current playback rate */
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uint8 current_song; /* current song */
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boolean bankswitched; /* is bankswitched? */
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/* $$$ ben : Playing time ... */
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uint32 cur_frame;
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uint32 cur_frame_end;
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uint32 * song_frames;
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/* $$$ ben : Last error string */
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const char * errstr;
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/* CPU and APU contexts */
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nes6502_context *cpu;
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apu_t *apu;
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/* our main processing routine, calls all external mixing routines */
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void (*process)(uint8 *buffer, int num_samples);
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} nsf_t;
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/* $$$ ben : Generic loader struct */
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struct nsf_loader_t {
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/* Init and open. */
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int (*open)(struct nsf_loader_t * loader);
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/* Close and shutdown. */
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void (*close) (struct nsf_loader_t * loader);
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/* This function should return <0 on error, else the number of byte NOT read.
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* that way a simple 0 test tell us if read was complete.
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*/
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int (*read) (struct nsf_loader_t * loader, void *data, int n);
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/* Get file length. */
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int (*length) (struct nsf_loader_t * loader);
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/* Skip n bytes. */
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int (*skip) (struct nsf_loader_t * loader,int n);
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/* Get filename (for debug). */
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const char * (*fname) (struct nsf_loader_t * loader);
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};
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/* Function prototypes */
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extern int nsf_init(void);
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extern nsf_t * nsf_load_extended(struct nsf_loader_t * loader);
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extern nsf_t *nsf_load(const char *filename, void *source, int length);
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extern void nsf_free(nsf_t **nsf_info);
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extern int nsf_playtrack(nsf_t *nsf, int track, int sample_rate,
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int sample_bits, boolean stereo);
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extern void nsf_frame(nsf_t *nsf);
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extern int nsf_setchan(nsf_t *nsf, int chan, boolean enabled);
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extern int nsf_setfilter(nsf_t *nsf, int filter_type);
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#endif /* _NSF_H_ */
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/*
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** $Log$
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** Revision 1.3 2008/04/10 10:01:48 tpm
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** * gst/nsf/nsf.h:
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** Change prototype of process function here too to avoid
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** 'incompatible assignment' warnings.
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**
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** Revision 1.2 2008-03-25 15:56:12 slomo
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** Patch by: Andreas Henriksson <andreas at fatal dot set>
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** * gst/nsf/Makefile.am:
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** * gst/nsf/dis6502.h:
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** * gst/nsf/fds_snd.c:
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** * gst/nsf/fds_snd.h:
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** * gst/nsf/fmopl.c:
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** * gst/nsf/fmopl.h:
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** * gst/nsf/gstnsf.c:
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** * gst/nsf/log.c:
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** * gst/nsf/log.h:
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** * gst/nsf/memguard.c:
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** * gst/nsf/memguard.h:
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** * gst/nsf/mmc5_snd.c:
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** * gst/nsf/mmc5_snd.h:
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** * gst/nsf/nes6502.c:
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** * gst/nsf/nes6502.h:
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** * gst/nsf/nes_apu.c:
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** * gst/nsf/nes_apu.h:
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** * gst/nsf/nsf.c:
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** * gst/nsf/nsf.h:
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** * gst/nsf/osd.h:
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** * gst/nsf/types.h:
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** * gst/nsf/vrc7_snd.c:
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** * gst/nsf/vrc7_snd.h:
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** * gst/nsf/vrcvisnd.c:
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** * gst/nsf/vrcvisnd.h:
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** Update our internal nosefart to nosefart-2.7-mls to fix segfaults
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** on some files. Fixes bug #498237.
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** Remove some // comments, fix some compiler warnings and use pow()
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** instead of a slow, selfmade implementation.
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**
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** Revision 1.3 2003/05/01 22:34:20 benjihan
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** New NSF plugin
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**
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** Revision 1.2 2003/04/09 14:50:32 ben
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** Clean NSF api.
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**
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** Revision 1.1 2003/04/08 20:53:00 ben
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** Adding more files...
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**
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** Revision 1.11 2000/07/04 04:59:24 matt
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** removed DOS-specific stuff
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**
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** Revision 1.10 2000/07/03 02:19:36 matt
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** dynamic address range handlers, cleaner and faster
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**
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** Revision 1.9 2000/06/23 03:27:58 matt
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** cleaned up external sound inteface
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**
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** Revision 1.8 2000/06/20 04:04:37 matt
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** moved external soundchip struct to apu module
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**
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** Revision 1.7 2000/06/20 00:05:45 matt
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** changed to driver-based external sound generation
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**
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** Revision 1.6 2000/06/13 03:51:54 matt
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** update API to take freq/sample data on nsf_playtrack
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**
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** Revision 1.5 2000/06/12 01:13:00 matt
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** added CPU/APU as members of the nsf struct
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**
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** Revision 1.4 2000/06/09 15:12:26 matt
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** initial revision
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**
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*/
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