soundfont.c

h内核

	}
	/*smp->v.loopend++;*/

	smp->v.dummy = 0;
	smp->v.truesize = 0;
	smp->v.sf_id = sf->id;

	/* set up voice info */
	if ((zone = sf_zone_new(sflist, sf)) == NULL) {
		sf_sample_delete(sflist, sf, smp);
		return -ENOMEM;
	}

	/*
	 * load wave data
	 */
	if (sflist->callback.sample_new) {
		rc = sflist->callback.sample_new
			(sflist->callback.private_data, smp, sflist->memhdr, data, count);
		if (rc < 0) {
			sf_sample_delete(sflist, sf, smp);
			return rc;
		}
		/* memory offset is updated after */
	}

	/* update the memory offset here */
	sflist->mem_used += smp->v.truesize;

	zone->v.sample = sample_id; /* the last sample */
	zone->v.rate_offset = calc_rate_offset(patch.base_freq);
	note = freq_to_note(patch.base_note);
	zone->v.root = note / 100;
	zone->v.tune = -(note % 100);
	zone->v.low = (freq_to_note(patch.low_note) + 99) / 100;
	zone->v.high = freq_to_note(patch.high_note) / 100;
	/* panning position; -128 - 127 => 0-127 */
	zone->v.pan = (patch.panning + 128) / 2;
#if 0
	snd_printk("gus: basefrq=%d (ofs=%d) root=%d,tune=%d, range:%d-%d\n",
		   (int)patch.base_freq, zone->v.rate_offset,
		   zone->v.root, zone->v.tune, zone->v.low, zone->v.high);
#endif

	/* detuning is ignored */
	/* 6points volume envelope */
	if (patch.mode & WAVE_ENVELOPES) {
		int attack, hold, decay, release;
		attack = calc_gus_envelope_time
			(patch.env_rate[0], 0, patch.env_offset[0]);
		hold = calc_gus_envelope_time
			(patch.env_rate[1], patch.env_offset[0],
			 patch.env_offset[1]);
		decay = calc_gus_envelope_time
			(patch.env_rate[2], patch.env_offset[1],
			 patch.env_offset[2]);
		release = calc_gus_envelope_time
			(patch.env_rate[3], patch.env_offset[1],
			 patch.env_offset[4]);
		release += calc_gus_envelope_time
			(patch.env_rate[4], patch.env_offset[3],
			 patch.env_offset[4]);
		release += calc_gus_envelope_time
			(patch.env_rate[5], patch.env_offset[4],
			 patch.env_offset[5]);
		zone->v.parm.volatkhld = 
			(snd_sf_calc_parm_hold(hold) << 8) |
			snd_sf_calc_parm_attack(attack);
		zone->v.parm.voldcysus = (calc_gus_sustain(patch.env_offset[2]) << 8) |
			snd_sf_calc_parm_decay(decay);
		zone->v.parm.volrelease = 0x8000 | snd_sf_calc_parm_decay(release);
		zone->v.attenuation = calc_gus_attenuation(patch.env_offset[0]);
#if 0
		snd_printk("gus: atkhld=%x, dcysus=%x, volrel=%x, att=%d\n",
			   zone->v.parm.volatkhld,
			   zone->v.parm.voldcysus,
			   zone->v.parm.volrelease,
			   zone->v.attenuation);
#endif
	}

	/* fast release */
	if (patch.mode & WAVE_FAST_RELEASE) {
		zone->v.parm.volrelease = 0x807f;
	}

	/* tremolo effect */
	if (patch.mode & WAVE_TREMOLO) {
		int rate = (patch.tremolo_rate * 1000 / 38) / 42;
		zone->v.parm.tremfrq = ((patch.tremolo_depth / 2) << 8) | rate;
	}
	/* vibrato effect */
	if (patch.mode & WAVE_VIBRATO) {
		int rate = (patch.vibrato_rate * 1000 / 38) / 42;
		zone->v.parm.fm2frq2 = ((patch.vibrato_depth / 6) << 8) | rate;
	}
	
	/* scale_freq, scale_factor, volume, and fractions not implemented */

	if (!(smp->v.mode_flags & SNDRV_SFNT_SAMPLE_SINGLESHOT))
		zone->v.mode = SNDRV_SFNT_MODE_LOOPING;
	else
		zone->v.mode = 0;

	/* append to the tail of the list */
	/*zone->bank = ctrls[AWE_MD_GUS_BANK];*/
	zone->bank = 0;
	zone->instr = patch.instr_no;
	zone->mapped = 0;
	zone->v.sf_id = sf->id;

	zone->sample = set_sample(sf, &zone->v);

	/* rebuild preset now */
	add_preset(sflist, zone);

	return 0;
}

/* load GUS patch */
int
snd_soundfont_load_guspatch(snd_sf_list_t *sflist, const char __user *data,
			    long count, int client)
{
	int rc;
	lock_preset(sflist);
	rc = load_guspatch(sflist, data, count, client);
	unlock_preset(sflist);
	return rc;
}


/*
 * Rebuild the preset table.  This is like a hash table in that it allows
 * quick access to the zone information.  For each preset there are zone
 * structures linked by next_instr and by next_zone.  Former is the whole
 * link for this preset, and latter is the link for zone (i.e. instrument/
 * bank/key combination).
 */
static void
rebuild_presets(snd_sf_list_t *sflist)
{
	snd_soundfont_t *sf;
	snd_sf_zone_t *cur;

	/* clear preset table */
	memset(sflist->presets, 0, sizeof(sflist->presets));

	/* search all fonts and insert each font */
	for (sf = sflist->fonts; sf; sf = sf->next) {
		for (cur = sf->zones; cur; cur = cur->next) {
			if (! cur->mapped && cur->sample == NULL) {
				/* try again to search the corresponding sample */
				cur->sample = set_sample(sf, &cur->v);
				if (cur->sample == NULL)
					continue;
			}

			add_preset(sflist, cur);
		}
	}
}


/*
 * add the given zone to preset table
 */
static void
add_preset(snd_sf_list_t *sflist, snd_sf_zone_t *cur)
{
	snd_sf_zone_t *zone;
	int index;

	zone = search_first_zone(sflist, cur->bank, cur->instr, cur->v.low);
	if (zone && zone->v.sf_id != cur->v.sf_id) {
		/* different instrument was already defined */
		snd_sf_zone_t *p;
		/* compare the allocated time */
		for (p = zone; p; p = p->next_zone) {
			if (p->counter > cur->counter)
				/* the current is older.. skipped */
				return;
		}
		/* remove old zones */
		delete_preset(sflist, zone);
		zone = NULL; /* do not forget to clear this! */
	}

	/* prepend this zone */
	if ((index = get_index(cur->bank, cur->instr, cur->v.low)) < 0)
		return;
	cur->next_zone = zone; /* zone link */
	cur->next_instr = sflist->presets[index]; /* preset table link */
	sflist->presets[index] = cur;
}

/*
 * delete the given zones from preset_table
 */
static void
delete_preset(snd_sf_list_t *sflist, snd_sf_zone_t *zp)
{
	int index;
	snd_sf_zone_t *p;

	if ((index = get_index(zp->bank, zp->instr, zp->v.low)) < 0)
		return;
	for (p = sflist->presets[index]; p; p = p->next_instr) {
		while (p->next_instr == zp) {
			p->next_instr = zp->next_instr;
			zp = zp->next_zone;
			if (zp == NULL)
				return;
		}
	}
}


/*
 * Search matching zones from preset table.
 * The note can be rewritten by preset mapping (alias).
 * The found zones are stored on 'table' array.  max_layers defines
 * the maximum number of elements in this array.
 * This function returns the number of found zones.  0 if not found.
 */
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)
{
	int nvoices;
	unsigned long flags;

	/* this function is supposed to be called atomically,
	 * so we check the lock.  if it's busy, just returns 0 to
	 * tell the caller the busy state
	 */
	spin_lock_irqsave(&sflist->lock, flags);
	if (sflist->presets_locked) {
		spin_unlock_irqrestore(&sflist->lock, flags);
		return 0;
	}
	nvoices = search_zones(sflist, notep, vel, preset, bank, table, max_layers, 0);
	if (! nvoices) {
		if (preset != def_preset || bank != def_bank)
			nvoices = search_zones(sflist, notep, vel, def_preset, def_bank, table, max_layers, 0);
	}
	spin_unlock_irqrestore(&sflist->lock, flags);
	return nvoices;
}


/*
 * search the first matching zone
 */
static snd_sf_zone_t *
search_first_zone(snd_sf_list_t *sflist, int bank, int preset, int key)
{
	int index;
	snd_sf_zone_t *zp;

	if ((index = get_index(bank, preset, key)) < 0)
		return NULL;
	for (zp = sflist->presets[index]; zp; zp = zp->next_instr) {
		if (zp->instr == preset && zp->bank == bank)
			return zp;
	}
	return NULL;
}


/*
 * search matching zones from sflist.  can be called recursively.
 */
static int
search_zones(snd_sf_list_t *sflist, int *notep, int vel, int preset, int bank, snd_sf_zone_t **table, int max_layers, int level)
{
	snd_sf_zone_t *zp;
	int nvoices;

	zp = search_first_zone(sflist, bank, preset, *notep);
	nvoices = 0;
	for (; zp; zp = zp->next_zone) {
		if (*notep >= zp->v.low && *notep <= zp->v.high &&
		    vel >= zp->v.vellow && vel <= zp->v.velhigh) {
			if (zp->mapped) {
				/* search preset mapping (aliasing) */
				int key = zp->v.fixkey;
				preset = zp->v.start;
				bank = zp->v.end;

				if (level > 5) /* too deep alias level */
					return 0;
				if (key < 0)
					key = *notep;
				nvoices = search_zones(sflist, &key, vel,
						       preset, bank, table,
						       max_layers, level + 1);
				if (nvoices > 0)
					*notep = key;
				break;
			}
			table[nvoices++] = zp;
			if (nvoices >= max_layers)
				break;
		}
	}

	return nvoices;
}


/* calculate the index of preset table:
 * drums are mapped from 128 to 255 according to its note key.
 * other instruments are mapped from 0 to 127.
 * if the index is out of range, return -1.
 */
static int
get_index(int bank, int instr, int key)
{
	int index;
	if (SF_IS_DRUM_BANK(bank))
		index = key + SF_MAX_INSTRUMENTS;
	else
		index = instr;
	index = index % SF_MAX_PRESETS;
	if (index < 0)
		return -1;
	return index;
}

/*
 * Initialise the sflist structure.
 */
static void
snd_sf_init(snd_sf_list_t *sflist)
{
	memset(sflist->presets, 0, sizeof(sflist->presets));

	sflist->mem_used = 0;
	sflist->currsf = NULL;
	sflist->open_client = -1;
	sflist->fonts = NULL;
	sflist->fonts_size = 0;
	sflist->zone_counter = 0;
	sflist->sample_counter = 0;
	sflist->zone_locked = 0;
	sflist->sample_locked = 0;
}

/*
 * Release all list records
 */
static void
snd_sf_clear(snd_sf_list_t *sflist)
{
	snd_soundfont_t *sf, *nextsf;
	snd_sf_zone_t *zp, *nextzp;
	snd_sf_sample_t *sp, *nextsp;

	for (sf = sflist->fonts; sf; sf = nextsf) {
		nextsf = sf->next;
		for (zp = sf->zones; zp; zp = nextzp) {
			nextzp = zp->next;
			kfree(zp);
		}
		for (sp = sf->samples; sp; sp = nextsp) {
			nextsp = sp->next;
			if (sflist->callback.sample_free)
				sflist->callback.sample_free(sflist->callback.private_data, sp, sflist->memhdr);
			kfree(sp);
		}
		kfree(sf);
	}

	snd_sf_init(sflist);
}


/*
 * Create a new sflist structure
 */
snd_sf_list_t *
snd_sf_new(snd_sf_callback_t *callback, snd_util_memhdr_t *hdr)
{
	snd_sf_list_t *sflist;

	if ((sflist = kcalloc(1, sizeof(*sflist), GFP_KERNEL)) == NULL)
		return NULL;

	init_MUTEX(&sflist->presets_mutex);
	spin_lock_init(&sflist->lock);
	sflist->memhdr = hdr;

	if (callback)
		sflist->callback = *callback;

	snd_sf_init(sflist);
	return sflist;
}


/*
 * Free everything allocated off the sflist structure.
 */
void
snd_sf_free(snd_sf_list_t *sflist)
{
	if (sflist == NULL)
		return;
	
	lock_preset(sflist);
	if (sflist->callback.sample_reset)
		sflist->callback.sample_reset(sflist->callback.private_data);
	snd_sf_clear(sflist);
	unlock_preset(sflist);

	kfree(sflist);
}

/*
 * Remove all samples
 * The soundcard should be silet before calling this function.
 */
int
snd_soundfont_remove_samples(snd_sf_list_t *sflist)
{
	lock_preset(sflist);
	if (sflist->callback.sample_reset)
		sflist->callback.sample_reset(sflist->callback.private_data);
	snd_sf_clear(sflist);
	unlock_preset(sflist);

	return 0;
}

/*
 * Remove unlocked samples.
 * The soundcard should be silent before calling this function.
 */
int
snd_soundfont_remove_unlocked(snd_sf_list_t *sflist)
{
	snd_soundfont_t *sf;
	snd_sf_zone_t *zp, *nextzp;
	snd_sf_sample_t *sp, *nextsp;

	lock_preset(sflist);

	if (sflist->callback.sample_reset)
		sflist->callback.sample_reset(sflist->callback.private_data);

	/* to be sure */
	memset(sflist->presets, 0, sizeof(sflist->presets));

	for (sf = sflist->fonts; sf; sf = sf->next) {
		for (zp = sf->zones; zp; zp = nextzp) {
			if (zp->counter < sflist->zone_locked)
				break;
			nextzp = zp->next;
			sf->zones = nextzp;
			kfree(zp);
		}

		for (sp = sf->samples; sp; sp = nextsp) {
			if (sp->counter < sflist->sample_locked)
				break;
			nextsp = sp->next;
			sf->samples = nextsp;
			sflist->mem_used -= sp->v.truesize;
			if (sflist->callback.sample_free)
				sflist->callback.sample_free(sflist->callback.private_data, sp, sflist->memhdr);
			kfree(sp);
		}
	}

	sflist->zone_counter = sflist->zone_locked;
	sflist->sample_counter = sflist->sample_locked;

	rebuild_presets(sflist);

	unlock_preset(sflist);
	return 0;
}