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linux/sound/synth/emux/soundfont.c
Eric Sesterhenn d20cad602f [ALSA] NULL pointer dereference in sound/synth/emux/soundfont.c 
this is about coverity id #100.
It seems the if statement is negated, since the else branch calls
remove_info() with sflist->currsf as a parameter where it gets
dereferenced.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2006-06-22 21:34:05 +02:00

1491 lines
37 KiB
C
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/*
* Soundfont generic routines.
* It is intended that these should be used by any driver that is willing
* to accept soundfont patches.
*
* 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
*/
/*
* Deal with reading in of a soundfont. Code follows the OSS way
* of doing things so that the old sfxload utility can be used.
* Everything may change when there is an alsa way of doing things.
*/
#include <sound/driver.h>
#include <asm/uaccess.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/soundfont.h>
#include <sound/seq_oss_legacy.h>
/* Prototypes for static functions */
static int open_patch(struct snd_sf_list *sflist, const char __user *data,
int count, int client);
static struct snd_soundfont *newsf(struct snd_sf_list *sflist, int type, char *name);
static int is_identical_font(struct snd_soundfont *sf, int type, unsigned char *name);
static int close_patch(struct snd_sf_list *sflist);
static int probe_data(struct snd_sf_list *sflist, int sample_id);
static void set_zone_counter(struct snd_sf_list *sflist,
struct snd_soundfont *sf, struct snd_sf_zone *zp);
static struct snd_sf_zone *sf_zone_new(struct snd_sf_list *sflist,
struct snd_soundfont *sf);
static void set_sample_counter(struct snd_sf_list *sflist,
struct snd_soundfont *sf, struct snd_sf_sample *sp);
static struct snd_sf_sample *sf_sample_new(struct snd_sf_list *sflist,
struct snd_soundfont *sf);
static void sf_sample_delete(struct snd_sf_list *sflist,
struct snd_soundfont *sf, struct snd_sf_sample *sp);
static int load_map(struct snd_sf_list *sflist, const void __user *data, int count);
static int load_info(struct snd_sf_list *sflist, const void __user *data, long count);
static int remove_info(struct snd_sf_list *sflist, struct snd_soundfont *sf,
int bank, int instr);
static void init_voice_info(struct soundfont_voice_info *avp);
static void init_voice_parm(struct soundfont_voice_parm *pp);
static struct snd_sf_sample *set_sample(struct snd_soundfont *sf,
struct soundfont_voice_info *avp);
static struct snd_sf_sample *find_sample(struct snd_soundfont *sf, int sample_id);
static int load_data(struct snd_sf_list *sflist, const void __user *data, long count);
static void rebuild_presets(struct snd_sf_list *sflist);
static void add_preset(struct snd_sf_list *sflist, struct snd_sf_zone *cur);
static void delete_preset(struct snd_sf_list *sflist, struct snd_sf_zone *zp);
static struct snd_sf_zone *search_first_zone(struct snd_sf_list *sflist,
int bank, int preset, int key);
static int search_zones(struct snd_sf_list *sflist, int *notep, int vel,
int preset, int bank, struct snd_sf_zone **table,
int max_layers, int level);
static int get_index(int bank, int instr, int key);
static void snd_sf_init(struct snd_sf_list *sflist);
static void snd_sf_clear(struct snd_sf_list *sflist);
/*
* lock access to sflist
*/
static void
lock_preset(struct snd_sf_list *sflist)
{
unsigned long flags;
mutex_lock(&sflist->presets_mutex);
spin_lock_irqsave(&sflist->lock, flags);
sflist->presets_locked = 1;
spin_unlock_irqrestore(&sflist->lock, flags);
}
/*
* remove lock
*/
static void
unlock_preset(struct snd_sf_list *sflist)
{
unsigned long flags;
spin_lock_irqsave(&sflist->lock, flags);
sflist->presets_locked = 0;
spin_unlock_irqrestore(&sflist->lock, flags);
mutex_unlock(&sflist->presets_mutex);
}
/*
* close the patch if the patch was opened by this client.
*/
int
snd_soundfont_close_check(struct snd_sf_list *sflist, int client)
{
unsigned long flags;
spin_lock_irqsave(&sflist->lock, flags);
if (sflist->open_client == client) {
spin_unlock_irqrestore(&sflist->lock, flags);
return close_patch(sflist);
}
spin_unlock_irqrestore(&sflist->lock, flags);
return 0;
}
/*
* Deal with a soundfont patch. Any driver could use these routines
* although it was designed for the AWE64.
*
* The sample_write and callargs pararameters allow a callback into
* the actual driver to write sample data to the board or whatever
* it wants to do with it.
*/
int
snd_soundfont_load(struct snd_sf_list *sflist, const void __user *data,
long count, int client)
{
struct soundfont_patch_info patch;
unsigned long flags;
int rc;
if (count < (long)sizeof(patch)) {
snd_printk("patch record too small %ld\n", count);
return -EINVAL;
}
if (copy_from_user(&patch, data, sizeof(patch)))
return -EFAULT;
count -= sizeof(patch);
data += sizeof(patch);
if (patch.key != SNDRV_OSS_SOUNDFONT_PATCH) {
snd_printk("'The wrong kind of patch' %x\n", patch.key);
return -EINVAL;
}
if (count < patch.len) {
snd_printk("Patch too short %ld, need %d\n", count, patch.len);
return -EINVAL;
}
if (patch.len < 0) {
snd_printk("poor length %d\n", patch.len);
return -EINVAL;
}
if (patch.type == SNDRV_SFNT_OPEN_PATCH) {
/* grab sflist to open */
lock_preset(sflist);
rc = open_patch(sflist, data, count, client);
unlock_preset(sflist);
return rc;
}
/* check if other client already opened patch */
spin_lock_irqsave(&sflist->lock, flags);
if (sflist->open_client != client) {
spin_unlock_irqrestore(&sflist->lock, flags);
return -EBUSY;
}
spin_unlock_irqrestore(&sflist->lock, flags);
lock_preset(sflist);
rc = -EINVAL;
switch (patch.type) {
case SNDRV_SFNT_LOAD_INFO:
rc = load_info(sflist, data, count);
break;
case SNDRV_SFNT_LOAD_DATA:
rc = load_data(sflist, data, count);
break;
case SNDRV_SFNT_CLOSE_PATCH:
rc = close_patch(sflist);
break;
case SNDRV_SFNT_REPLACE_DATA:
/*rc = replace_data(&patch, data, count);*/
break;
case SNDRV_SFNT_MAP_PRESET:
rc = load_map(sflist, data, count);
break;
case SNDRV_SFNT_PROBE_DATA:
rc = probe_data(sflist, patch.optarg);
break;
case SNDRV_SFNT_REMOVE_INFO:
/* patch must be opened */
if (!sflist->currsf) {
snd_printk("soundfont: remove_info: patch not opened\n");
rc = -EINVAL;
} else {
int bank, instr;
bank = ((unsigned short)patch.optarg >> 8) & 0xff;
instr = (unsigned short)patch.optarg & 0xff;
if (! remove_info(sflist, sflist->currsf, bank, instr))
rc = -EINVAL;
else
rc = 0;
}
break;
}
unlock_preset(sflist);
return rc;
}
/* check if specified type is special font (GUS or preset-alias) */
static inline int
is_special_type(int type)
{
type &= 0x0f;
return (type == SNDRV_SFNT_PAT_TYPE_GUS ||
type == SNDRV_SFNT_PAT_TYPE_MAP);
}
/* open patch; create sf list */
static int
open_patch(struct snd_sf_list *sflist, const char __user *data,
int count, int client)
{
struct soundfont_open_parm parm;
struct snd_soundfont *sf;
unsigned long flags;
spin_lock_irqsave(&sflist->lock, flags);
if (sflist->open_client >= 0 || sflist->currsf) {
spin_unlock_irqrestore(&sflist->lock, flags);
return -EBUSY;
}
spin_unlock_irqrestore(&sflist->lock, flags);
if (copy_from_user(&parm, data, sizeof(parm)))
return -EFAULT;
if (is_special_type(parm.type)) {
parm.type |= SNDRV_SFNT_PAT_SHARED;
sf = newsf(sflist, parm.type, NULL);
} else
sf = newsf(sflist, parm.type, parm.name);
if (sf == NULL) {
return -ENOMEM;
}
spin_lock_irqsave(&sflist->lock, flags);
sflist->open_client = client;
sflist->currsf = sf;
spin_unlock_irqrestore(&sflist->lock, flags);
return 0;
}
/*
* Allocate a new soundfont structure.
*/
static struct snd_soundfont *
newsf(struct snd_sf_list *sflist, int type, char *name)
{
struct snd_soundfont *sf;
/* check the shared fonts */
if (type & SNDRV_SFNT_PAT_SHARED) {
for (sf = sflist->fonts; sf; sf = sf->next) {
if (is_identical_font(sf, type, name)) {
return sf;
}
}
}
/* not found -- create a new one */
sf = kzalloc(sizeof(*sf), GFP_KERNEL);
if (sf == NULL)
return NULL;
sf->id = sflist->fonts_size;
sflist->fonts_size++;
/* prepend this record */
sf->next = sflist->fonts;
sflist->fonts = sf;
sf->type = type;
sf->zones = NULL;
sf->samples = NULL;
if (name)
memcpy(sf->name, name, SNDRV_SFNT_PATCH_NAME_LEN);
return sf;
}
/* check if the given name matches to the existing list */
static int
is_identical_font(struct snd_soundfont *sf, int type, unsigned char *name)
{
return ((sf->type & SNDRV_SFNT_PAT_SHARED) &&
(sf->type & 0x0f) == (type & 0x0f) &&
(name == NULL ||
memcmp(sf->name, name, SNDRV_SFNT_PATCH_NAME_LEN) == 0));
}
/*
* Close the current patch.
*/
static int
close_patch(struct snd_sf_list *sflist)
{
unsigned long flags;
spin_lock_irqsave(&sflist->lock, flags);
sflist->currsf = NULL;
sflist->open_client = -1;
spin_unlock_irqrestore(&sflist->lock, flags);
rebuild_presets(sflist);
return 0;
}
/* probe sample in the current list -- nothing to be loaded */
static int
probe_data(struct snd_sf_list *sflist, int sample_id)
{
/* patch must be opened */
if (sflist->currsf) {
/* search the specified sample by optarg */
if (find_sample(sflist->currsf, sample_id))
return 0;
}
return -EINVAL;
}
/*
* increment zone counter
*/
static void
set_zone_counter(struct snd_sf_list *sflist, struct snd_soundfont *sf,
struct snd_sf_zone *zp)
{
zp->counter = sflist->zone_counter++;
if (sf->type & SNDRV_SFNT_PAT_LOCKED)
sflist->zone_locked = sflist->zone_counter;
}
/*
* allocate a new zone record
*/
static struct snd_sf_zone *
sf_zone_new(struct snd_sf_list *sflist, struct snd_soundfont *sf)
{
struct snd_sf_zone *zp;
if ((zp = kzalloc(sizeof(*zp), GFP_KERNEL)) == NULL)
return NULL;
zp->next = sf->zones;
sf->zones = zp;
init_voice_info(&zp->v);
set_zone_counter(sflist, sf, zp);
return zp;
}
/*
* increment sample couter
*/
static void
set_sample_counter(struct snd_sf_list *sflist, struct snd_soundfont *sf,
struct snd_sf_sample *sp)
{
sp->counter = sflist->sample_counter++;
if (sf->type & SNDRV_SFNT_PAT_LOCKED)
sflist->sample_locked = sflist->sample_counter;
}
/*
* allocate a new sample list record
*/
static struct snd_sf_sample *
sf_sample_new(struct snd_sf_list *sflist, struct snd_soundfont *sf)
{
struct snd_sf_sample *sp;
if ((sp = kzalloc(sizeof(*sp), GFP_KERNEL)) == NULL)
return NULL;
sp->next = sf->samples;
sf->samples = sp;
set_sample_counter(sflist, sf, sp);
return sp;
}
/*
* delete sample list -- this is an exceptional job.
* only the last allocated sample can be deleted.
*/
static void
sf_sample_delete(struct snd_sf_list *sflist, struct snd_soundfont *sf,
struct snd_sf_sample *sp)
{
/* only last sample is accepted */
if (sp == sf->samples) {
sf->samples = sp->next;
kfree(sp);
}
}
/* load voice map */
static int
load_map(struct snd_sf_list *sflist, const void __user *data, int count)
{
struct snd_sf_zone *zp, *prevp;
struct snd_soundfont *sf;
struct soundfont_voice_map map;
/* get the link info */
if (count < (int)sizeof(map))
return -EINVAL;
if (copy_from_user(&map, data, sizeof(map)))
return -EFAULT;
if (map.map_instr < 0 || map.map_instr >= SF_MAX_INSTRUMENTS)
return -EINVAL;
sf = newsf(sflist, SNDRV_SFNT_PAT_TYPE_MAP|SNDRV_SFNT_PAT_SHARED, NULL);
if (sf == NULL)
return -ENOMEM;
prevp = NULL;
for (zp = sf->zones; zp; prevp = zp, zp = zp->next) {
if (zp->mapped &&
zp->instr == map.map_instr &&
zp->bank == map.map_bank &&
zp->v.low == map.map_key &&
zp->v.start == map.src_instr &&
zp->v.end == map.src_bank &&
zp->v.fixkey == map.src_key) {
/* the same mapping is already present */
/* relink this record to the link head */
if (prevp) {
prevp->next = zp->next;
zp->next = sf->zones;
sf->zones = zp;
}
/* update the counter */
set_zone_counter(sflist, sf, zp);
return 0;
}
}
/* create a new zone */
if ((zp = sf_zone_new(sflist, sf)) == NULL)
return -ENOMEM;
zp->bank = map.map_bank;
zp->instr = map.map_instr;
zp->mapped = 1;
if (map.map_key >= 0) {
zp->v.low = map.map_key;
zp->v.high = map.map_key;
}
zp->v.start = map.src_instr;
zp->v.end = map.src_bank;
zp->v.fixkey = map.src_key;
zp->v.sf_id = sf->id;
add_preset(sflist, zp);
return 0;
}
/* remove the present instrument layers */
static int
remove_info(struct snd_sf_list *sflist, struct snd_soundfont *sf,
int bank, int instr)
{
struct snd_sf_zone *prev, *next, *p;
int removed = 0;
prev = NULL;
for (p = sf->zones; p; p = next) {
next = p->next;
if (! p->mapped &&
p->bank == bank && p->instr == instr) {
/* remove this layer */
if (prev)
prev->next = next;
else
sf->zones = next;
removed++;
kfree(p);
} else
prev = p;
}
if (removed)
rebuild_presets(sflist);
return removed;
}
/*
* Read an info record from the user buffer and save it on the current
* open soundfont.
*/
static int
load_info(struct snd_sf_list *sflist, const void __user *data, long count)
{
struct snd_soundfont *sf;
struct snd_sf_zone *zone;
struct soundfont_voice_rec_hdr hdr;
int i;
/* patch must be opened */
if ((sf = sflist->currsf) == NULL)
return -EINVAL;
if (is_special_type(sf->type))
return -EINVAL;
if (count < (long)sizeof(hdr)) {
printk("Soundfont error: invalid patch zone length\n");
return -EINVAL;
}
if (copy_from_user((char*)&hdr, data, sizeof(hdr)))
return -EFAULT;
data += sizeof(hdr);
count -= sizeof(hdr);
if (hdr.nvoices <= 0 || hdr.nvoices >= 100) {
printk("Soundfont error: Illegal voice number %d\n", hdr.nvoices);
return -EINVAL;
}
if (count < (long)sizeof(struct soundfont_voice_info) * hdr.nvoices) {
printk("Soundfont Error: patch length(%ld) is smaller than nvoices(%d)\n",
count, hdr.nvoices);
return -EINVAL;
}
switch (hdr.write_mode) {
case SNDRV_SFNT_WR_EXCLUSIVE:
/* exclusive mode - if the instrument already exists,
return error */
for (zone = sf->zones; zone; zone = zone->next) {
if (!zone->mapped &&
zone->bank == hdr.bank &&
zone->instr == hdr.instr)
return -EINVAL;
}
break;
case SNDRV_SFNT_WR_REPLACE:
/* replace mode - remove the instrument if it already exists */
remove_info(sflist, sf, hdr.bank, hdr.instr);
break;
}
for (i = 0; i < hdr.nvoices; i++) {
struct snd_sf_zone tmpzone;
/* copy awe_voice_info parameters */
if (copy_from_user(&tmpzone.v, data, sizeof(tmpzone.v))) {
return -EFAULT;
}
data += sizeof(tmpzone.v);
count -= sizeof(tmpzone.v);
tmpzone.bank = hdr.bank;
tmpzone.instr = hdr.instr;
tmpzone.mapped = 0;
tmpzone.v.sf_id = sf->id;
if (tmpzone.v.mode & SNDRV_SFNT_MODE_INIT_PARM)
init_voice_parm(&tmpzone.v.parm);
/* create a new zone */
if ((zone = sf_zone_new(sflist, sf)) == NULL) {
return -ENOMEM;
}
/* copy the temporary data */
zone->bank = tmpzone.bank;
zone->instr = tmpzone.instr;
zone->v = tmpzone.v;
/* look up the sample */
zone->sample = set_sample(sf, &zone->v);
}
return 0;
}
/* initialize voice_info record */
static void
init_voice_info(struct soundfont_voice_info *avp)
{
memset(avp, 0, sizeof(*avp));
avp->root = 60;
avp->high = 127;
avp->velhigh = 127;
avp->fixkey = -1;
avp->fixvel = -1;
avp->fixpan = -1;
avp->pan = -1;
avp->amplitude = 127;
avp->scaleTuning = 100;
init_voice_parm(&avp->parm);
}
/* initialize voice_parm record:
* Env1/2: delay=0, attack=0, hold=0, sustain=0, decay=0, release=0.
* Vibrato and Tremolo effects are zero.
* Cutoff is maximum.
* Chorus and Reverb effects are zero.
*/
static void
init_voice_parm(struct soundfont_voice_parm *pp)
{
memset(pp, 0, sizeof(*pp));
pp->moddelay = 0x8000;
pp->modatkhld = 0x7f7f;
pp->moddcysus = 0x7f7f;
pp->modrelease = 0x807f;
pp->voldelay = 0x8000;
pp->volatkhld = 0x7f7f;
pp->voldcysus = 0x7f7f;
pp->volrelease = 0x807f;
pp->lfo1delay = 0x8000;
pp->lfo2delay = 0x8000;
pp->cutoff = 0xff;
}
/* search the specified sample */
static struct snd_sf_sample *
set_sample(struct snd_soundfont *sf, struct soundfont_voice_info *avp)
{
struct snd_sf_sample *sample;
sample = find_sample(sf, avp->sample);
if (sample == NULL)
return NULL;
/* add in the actual sample offsets:
* The voice_info addresses define only the relative offset
* from sample pointers. Here we calculate the actual DRAM
* offset from sample pointers.
*/
avp->start += sample->v.start;
avp->end += sample->v.end;
avp->loopstart += sample->v.loopstart;
avp->loopend += sample->v.loopend;
/* copy mode flags */
avp->sample_mode = sample->v.mode_flags;
return sample;
}
/* find the sample pointer with the given id in the soundfont */
static struct snd_sf_sample *
find_sample(struct snd_soundfont *sf, int sample_id)
{
struct snd_sf_sample *p;
if (sf == NULL)
return NULL;
for (p = sf->samples; p; p = p->next) {
if (p->v.sample == sample_id)
return p;
}
return NULL;
}
/*
* Load sample information, this can include data to be loaded onto
* the soundcard. It can also just be a pointer into soundcard ROM.
* If there is data it will be written to the soundcard via the callback
* routine.
*/
static int
load_data(struct snd_sf_list *sflist, const void __user *data, long count)
{
struct snd_soundfont *sf;
struct soundfont_sample_info sample_info;
struct snd_sf_sample *sp;
long off;
/* patch must be opened */
if ((sf = sflist->currsf) == NULL)
return -EINVAL;
if (is_special_type(sf->type))
return -EINVAL;
if (copy_from_user(&sample_info, data, sizeof(sample_info)))
return -EFAULT;
off = sizeof(sample_info);
if (sample_info.size != (count-off)/2)
return -EINVAL;
/* Check for dup */
if (find_sample(sf, sample_info.sample)) {
/* if shared sample, skip this data */
if (sf->type & SNDRV_SFNT_PAT_SHARED)
return 0;
return -EINVAL;
}
/* Allocate a new sample structure */
if ((sp = sf_sample_new(sflist, sf)) == NULL)
return -ENOMEM;
sp->v = sample_info;
sp->v.sf_id = sf->id;
sp->v.dummy = 0;
sp->v.truesize = sp->v.size;
/*
* If there is wave data then load it.
*/
if (sp->v.size > 0) {
int rc;
rc = sflist->callback.sample_new
(sflist->callback.private_data, sp, sflist->memhdr,
data + off, count - off);
if (rc < 0) {
sf_sample_delete(sflist, sf, sp);
return rc;
}
sflist->mem_used += sp->v.truesize;
}
return count;
}
/* log2_tbl[i] = log2(i+128) * 0x10000 */
static int log_tbl[129] = {
0x70000, 0x702df, 0x705b9, 0x7088e, 0x70b5d, 0x70e26, 0x710eb, 0x713aa,
0x71663, 0x71918, 0x71bc8, 0x71e72, 0x72118, 0x723b9, 0x72655, 0x728ed,
0x72b80, 0x72e0e, 0x73098, 0x7331d, 0x7359e, 0x7381b, 0x73a93, 0x73d08,
0x73f78, 0x741e4, 0x7444c, 0x746b0, 0x74910, 0x74b6c, 0x74dc4, 0x75019,
0x75269, 0x754b6, 0x75700, 0x75946, 0x75b88, 0x75dc7, 0x76002, 0x7623a,
0x7646e, 0x766a0, 0x768cd, 0x76af8, 0x76d1f, 0x76f43, 0x77164, 0x77382,
0x7759d, 0x777b4, 0x779c9, 0x77bdb, 0x77dea, 0x77ff5, 0x781fe, 0x78404,
0x78608, 0x78808, 0x78a06, 0x78c01, 0x78df9, 0x78fef, 0x791e2, 0x793d2,
0x795c0, 0x797ab, 0x79993, 0x79b79, 0x79d5d, 0x79f3e, 0x7a11d, 0x7a2f9,
0x7a4d3, 0x7a6ab, 0x7a880, 0x7aa53, 0x7ac24, 0x7adf2, 0x7afbe, 0x7b188,
0x7b350, 0x7b515, 0x7b6d8, 0x7b899, 0x7ba58, 0x7bc15, 0x7bdd0, 0x7bf89,
0x7c140, 0x7c2f5, 0x7c4a7, 0x7c658, 0x7c807, 0x7c9b3, 0x7cb5e, 0x7cd07,
0x7ceae, 0x7d053, 0x7d1f7, 0x7d398, 0x7d538, 0x7d6d6, 0x7d872, 0x7da0c,
0x7dba4, 0x7dd3b, 0x7ded0, 0x7e063, 0x7e1f4, 0x7e384, 0x7e512, 0x7e69f,
0x7e829, 0x7e9b3, 0x7eb3a, 0x7ecc0, 0x7ee44, 0x7efc7, 0x7f148, 0x7f2c8,
0x7f446, 0x7f5c2, 0x7f73d, 0x7f8b7, 0x7fa2f, 0x7fba5, 0x7fd1a, 0x7fe8d,
0x80000,
};
/* convert from linear to log value
*
* conversion: value = log2(amount / base) * ratio
*
* argument:
* amount = linear value (unsigned, 32bit max)
* offset = base offset (:= log2(base) * 0x10000)
* ratio = division ratio
*
*/
int
snd_sf_linear_to_log(unsigned int amount, int offset, int ratio)
{
int v;
int s, low, bit;
if (amount < 2)
return 0;
for (bit = 0; ! (amount & 0x80000000L); bit++)
amount <<= 1;
s = (amount >> 24) & 0x7f;
low = (amount >> 16) & 0xff;
/* linear approxmimation by lower 8 bit */
v = (log_tbl[s + 1] * low + log_tbl[s] * (0x100 - low)) >> 8;
v -= offset;
v = (v * ratio) >> 16;
v += (24 - bit) * ratio;
return v;
}
EXPORT_SYMBOL(snd_sf_linear_to_log);
#define OFFSET_MSEC 653117 /* base = 1000 */
#define OFFSET_ABSCENT 851781 /* base = 8176 */
#define OFFSET_SAMPLERATE 1011119 /* base = 44100 */
#define ABSCENT_RATIO 1200
#define TIMECENT_RATIO 1200
#define SAMPLERATE_RATIO 4096
/*
* mHz to abscent
* conversion: abscent = log2(MHz / 8176) * 1200
*/
static int
freq_to_note(int mhz)
{
return snd_sf_linear_to_log(mhz, OFFSET_ABSCENT, ABSCENT_RATIO);
}
/* convert Hz to AWE32 rate offset:
* sample pitch offset for the specified sample rate
* rate=44100 is no offset, each 4096 is 1 octave (twice).
* eg, when rate is 22050, this offset becomes -4096.
*
* conversion: offset = log2(Hz / 44100) * 4096
*/
static int
calc_rate_offset(int hz)
{
return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO);
}
/* calculate GUS envelope time */
static int
calc_gus_envelope_time(int rate, int start, int end)
{
int r, p, t;
r = (3 - ((rate >> 6) & 3)) * 3;
p = rate & 0x3f;
t = end - start;
if (t < 0) t = -t;
if (13 > r)
t = t << (13 - r);
else
t = t >> (r - 13);
return (t * 10) / (p * 441);
}
/* convert envelope time parameter to soundfont parameters */
/* attack & decay/release time table (msec) */
static short attack_time_tbl[128] = {
32767, 32767, 5989, 4235, 2994, 2518, 2117, 1780, 1497, 1373, 1259, 1154, 1058, 970, 890, 816,
707, 691, 662, 634, 607, 581, 557, 533, 510, 489, 468, 448, 429, 411, 393, 377,
361, 345, 331, 317, 303, 290, 278, 266, 255, 244, 234, 224, 214, 205, 196, 188,
180, 172, 165, 158, 151, 145, 139, 133, 127, 122, 117, 112, 107, 102, 98, 94,
90, 86, 82, 79, 75, 72, 69, 66, 63, 61, 58, 56, 53, 51, 49, 47,
45, 43, 41, 39, 37, 36, 34, 33, 31, 30, 29, 28, 26, 25, 24, 23,
22, 21, 20, 19, 19, 18, 17, 16, 16, 15, 15, 14, 13, 13, 12, 12,
11, 11, 10, 10, 10, 9, 9, 8, 8, 8, 8, 7, 7, 7, 6, 0,
};
static short decay_time_tbl[128] = {
32767, 32767, 22614, 15990, 11307, 9508, 7995, 6723, 5653, 5184, 4754, 4359, 3997, 3665, 3361, 3082,
2828, 2765, 2648, 2535, 2428, 2325, 2226, 2132, 2042, 1955, 1872, 1793, 1717, 1644, 1574, 1507,
1443, 1382, 1324, 1267, 1214, 1162, 1113, 1066, 978, 936, 897, 859, 822, 787, 754, 722,
691, 662, 634, 607, 581, 557, 533, 510, 489, 468, 448, 429, 411, 393, 377, 361,
345, 331, 317, 303, 290, 278, 266, 255, 244, 234, 224, 214, 205, 196, 188, 180,
172, 165, 158, 151, 145, 139, 133, 127, 122, 117, 112, 107, 102, 98, 94, 90,
86, 82, 79, 75, 72, 69, 66, 63, 61, 58, 56, 53, 51, 49, 47, 45,
43, 41, 39, 37, 36, 34, 33, 31, 30, 29, 28, 26, 25, 24, 23, 22,
};
/* delay time = 0x8000 - msec/92 */
int
snd_sf_calc_parm_hold(int msec)
{
int val = (0x7f * 92 - msec) / 92;
if (val < 1) val = 1;
if (val >= 126) val = 126;
return val;
}
/* search an index for specified time from given time table */
static int
calc_parm_search(int msec, short *table)
{
int left = 1, right = 127, mid;
while (left < right) {
mid = (left + right) / 2;
if (msec < (int)table[mid])
left = mid + 1;
else
right = mid;
}
return left;
}
/* attack time: search from time table */
int
snd_sf_calc_parm_attack(int msec)
{
return calc_parm_search(msec, attack_time_tbl);
}
/* decay/release time: search from time table */
int
snd_sf_calc_parm_decay(int msec)
{
return calc_parm_search(msec, decay_time_tbl);
}
int snd_sf_vol_table[128] = {
255,111,95,86,79,74,70,66,63,61,58,56,54,52,50,49,
47,46,45,43,42,41,40,39,38,37,36,35,34,34,33,32,
31,31,30,29,29,28,27,27,26,26,25,24,24,23,23,22,
22,21,21,21,20,20,19,19,18,18,18,17,17,16,16,16,
15,15,15,14,14,14,13,13,13,12,12,12,11,11,11,10,
10,10,10,9,9,9,8,8,8,8,7,7,7,7,6,6,
6,6,5,5,5,5,5,4,4,4,4,3,3,3,3,3,
2,2,2,2,2,1,1,1,1,1,0,0,0,0,0,0,
};
#define calc_gus_sustain(val) (0x7f - snd_sf_vol_table[(val)/2])
#define calc_gus_attenuation(val) snd_sf_vol_table[(val)/2]
/* load GUS patch */
static int
load_guspatch(struct snd_sf_list *sflist, const char __user *data,
long count, int client)
{
struct patch_info patch;
struct snd_soundfont *sf;
struct snd_sf_zone *zone;
struct snd_sf_sample *smp;
int note, sample_id;
int rc;
if (count < (long)sizeof(patch)) {
snd_printk("patch record too small %ld\n", count);
return -EINVAL;
}
if (copy_from_user(&patch, data, sizeof(patch)))
return -EFAULT;
count -= sizeof(patch);
data += sizeof(patch);
sf = newsf(sflist, SNDRV_SFNT_PAT_TYPE_GUS|SNDRV_SFNT_PAT_SHARED, NULL);
if (sf == NULL)
return -ENOMEM;
if ((smp = sf_sample_new(sflist, sf)) == NULL)
return -ENOMEM;
sample_id = sflist->sample_counter;
smp->v.sample = sample_id;
smp->v.start = 0;
smp->v.end = patch.len;
smp->v.loopstart = patch.loop_start;
smp->v.loopend = patch.loop_end;
smp->v.size = patch.len;
/* set up mode flags */
smp->v.mode_flags = 0;
if (!(patch.mode & WAVE_16_BITS))
smp->v.mode_flags |= SNDRV_SFNT_SAMPLE_8BITS;
if (patch.mode & WAVE_UNSIGNED)
smp->v.mode_flags |= SNDRV_SFNT_SAMPLE_UNSIGNED;
smp->v.mode_flags |= SNDRV_SFNT_SAMPLE_NO_BLANK;
if (!(patch.mode & (WAVE_LOOPING|WAVE_BIDIR_LOOP|WAVE_LOOP_BACK)))
smp->v.mode_flags |= SNDRV_SFNT_SAMPLE_SINGLESHOT;
if (patch.mode & WAVE_BIDIR_LOOP)
smp->v.mode_flags |= SNDRV_SFNT_SAMPLE_BIDIR_LOOP;
if (patch.mode & WAVE_LOOP_BACK)
smp->v.mode_flags |= SNDRV_SFNT_SAMPLE_REVERSE_LOOP;
if (patch.mode & WAVE_16_BITS) {
/* convert to word offsets */
smp->v.size /= 2;
smp->v.end /= 2;
smp->v.loopstart /= 2;
smp->v.loopend /= 2;
}
/*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(struct snd_sf_list *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(struct snd_sf_list *sflist)
{
struct snd_soundfont *sf;
struct snd_sf_zone *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(struct snd_sf_list *sflist, struct snd_sf_zone *cur)
{
struct snd_sf_zone *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 */
struct snd_sf_zone *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(struct snd_sf_list *sflist, struct snd_sf_zone *zp)
{
int index;
struct snd_sf_zone *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(struct snd_sf_list *sflist, int *notep, int vel,
int preset, int bank,
int def_preset, int def_bank,
struct snd_sf_zone **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 struct snd_sf_zone *
search_first_zone(struct snd_sf_list *sflist, int bank, int preset, int key)
{
int index;
struct snd_sf_zone *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(struct snd_sf_list *sflist, int *notep, int vel,
int preset, int bank, struct snd_sf_zone **table,
int max_layers, int level)
{
struct snd_sf_zone *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(struct snd_sf_list *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(struct snd_sf_list *sflist)
{
struct snd_soundfont *sf, *nextsf;
struct snd_sf_zone *zp, *nextzp;
struct snd_sf_sample *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
*/
struct snd_sf_list *
snd_sf_new(struct snd_sf_callback *callback, struct snd_util_memhdr *hdr)
{
struct snd_sf_list *sflist;
if ((sflist = kzalloc(sizeof(*sflist), GFP_KERNEL)) == NULL)
return NULL;
mutex_init(&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(struct snd_sf_list *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(struct snd_sf_list *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(struct snd_sf_list *sflist)
{
struct snd_soundfont *sf;
struct snd_sf_zone *zp, *nextzp;
struct snd_sf_sample *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;
}
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