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soundfont.h

#ifndef __SOUND_SOUNDFONT_H
#define __SOUND_SOUNDFONT_H

/*
 *  Soundfont defines and definitions.
 *
 *  Copyright (C) 1999 Steve Ratcliffe
 *  Copyright (c) 1999-2000 Takashi iwai <tiwai@suse.de>
 *
 *   This program 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.
 *
 *   This program 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 this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include "sfnt_info.h"
#include "util_mem.h"

#define SF_MAX_INSTRUMENTS    128   /* maximum instrument number */
#define SF_MAX_PRESETS  256   /* drums are mapped from 128 to 256 */
#define SF_IS_DRUM_BANK(z) ((z) == 128)

typedef struct snd_sf_zone {
      struct snd_sf_zone *next;     /* Link to next */
      unsigned char bank;           /* Midi bank for this zone */
      unsigned char instr;          /* Midi program for this zone */
      unsigned char mapped;         /* True if mapped to something else */

      soundfont_voice_info_t v;     /* All the soundfont parameters */
      int counter;
      struct snd_sf_sample *sample; /* Link to sample */

      /* The following deals with preset numbers (programs) */
      struct snd_sf_zone *next_instr;     /* Next zone of this instrument */
      struct snd_sf_zone *next_zone;      /* Next zone in play list */
} snd_sf_zone_t;

typedef struct snd_sf_sample {
      soundfont_sample_info_t v;
      int counter;
      snd_util_memblk_t *block;     /* allocated data block */
      struct snd_sf_sample *next;
} snd_sf_sample_t;

/*
 * This represents all the information relating to a soundfont.
 */
typedef struct snd_soundfont {
      struct snd_soundfont *next;   /* Link to next */
      /*struct snd_soundfont *prev;*/     /* Link to previous */
      short  id;        /* file id */
      short  type;            /* font type */
      unsigned char name[SNDRV_SFNT_PATCH_NAME_LEN];  /* identifier */
      snd_sf_zone_t *zones; /* Font information */
      snd_sf_sample_t *samples; /* The sample headers */
} snd_soundfont_t;

/*
 * Type of the sample access callback
 */
typedef int (*snd_sf_sample_new_t)(void *private_data, snd_sf_sample_t *sp,
                           snd_util_memhdr_t *hdr, const void __user *buf, long count);
typedef int (*snd_sf_sample_free_t)(void *private_data, snd_sf_sample_t *sp,
                            snd_util_memhdr_t *hdr);
typedef void (*snd_sf_sample_reset_t)(void *private);

typedef struct snd_sf_callback {
      void *private_data;
      snd_sf_sample_new_t sample_new;
      snd_sf_sample_free_t sample_free;
      snd_sf_sample_reset_t sample_reset;
} snd_sf_callback_t;

/*
 * List of soundfonts.
 */
typedef struct snd_sf_list {
      snd_soundfont_t *currsf; /* The currently open soundfont */
      int open_client;  /* client pointer for lock */
      int mem_used;           /* used memory size */
      snd_sf_zone_t *presets[SF_MAX_PRESETS];
      snd_soundfont_t *fonts; /* The list of soundfonts */
      int fonts_size;   /* number of fonts allocated */
      int zone_counter; /* last allocated time for zone */
      int sample_counter;     /* last allocated time for sample */
      int zone_locked;  /* locked time for zone */
      int sample_locked;      /* locked time for sample */
      snd_sf_callback_t callback;   /* callback functions */
      int presets_locked;
      struct semaphore presets_mutex;
      spinlock_t lock;
      snd_util_memhdr_t *memhdr;
} snd_sf_list_t;

/* Prototypes for soundfont.c */
int snd_soundfont_load(snd_sf_list_t *sflist, const void __user *data, long count, int client);
int snd_soundfont_load_guspatch(snd_sf_list_t *sflist, const char __user *data,
                        long count, int client);
int snd_soundfont_close_check(snd_sf_list_t *sflist, int client);

snd_sf_list_t *snd_sf_new(snd_sf_callback_t *callback, snd_util_memhdr_t *hdr);
void snd_sf_free(snd_sf_list_t *sflist);

int snd_soundfont_remove_samples(snd_sf_list_t *sflist);
int snd_soundfont_remove_unlocked(snd_sf_list_t *sflist);

int snd_soundfont_search_zone(snd_sf_list_t *sflist, int *notep, int vel,
                        int preset, int bank,
                        int def_preset, int def_bank,
                        snd_sf_zone_t **table, int max_layers);

/* Parameter conversions */
int snd_sf_calc_parm_hold(int msec);
int snd_sf_calc_parm_attack(int msec);
int snd_sf_calc_parm_decay(int msec);
#define snd_sf_calc_parm_delay(msec) (0x8000 - (msec) * 1000 / 725);
extern int snd_sf_vol_table[128];
int snd_sf_linear_to_log(unsigned int amount, int offset, int ratio);


#endif /* __SOUND_SOUNDFONT_H */

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