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alsa-utils/alsactl/state.c
Jaroslav Kysela 966c559f04 alsactl: state: verify only control count not numids 
The numids may change. Verify if a control is added or removed.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
2024-10-15 17:24:31 +02:00

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/*
* Advanced Linux Sound Architecture Control Program
* Copyright (c) by Abramo Bagnara <abramo@alsa-project.org>
* Jaroslav Kysela <perex@perex.cz>
*
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "aconfig.h"
#include "version.h"
#include <getopt.h>
#include <stdarg.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include "alsactl.h"
static char *id_str(snd_ctl_elem_id_t *id)
{
static char str[128];
assert(id);
sprintf(str, "%i,%i,%i,%s,%i",
snd_ctl_elem_id_get_interface(id),
snd_ctl_elem_id_get_device(id),
snd_ctl_elem_id_get_subdevice(id),
snd_ctl_elem_id_get_name(id),
snd_ctl_elem_id_get_index(id));
return str;
}
static char *num_str(long n)
{
static char str[32];
sprintf(str, "%ld", n);
return str;
}
static int snd_config_integer_add(snd_config_t *father, char *id, long integer)
{
int err;
snd_config_t *leaf;
err = snd_config_imake_integer(&leaf, id, integer);
if (err < 0)
return err;
err = snd_config_add(father, leaf);
if (err < 0) {
snd_config_delete(leaf);
return err;
}
return 0;
}
static int snd_config_integer64_add(snd_config_t *father, char *id, long long integer)
{
int err;
snd_config_t *leaf;
err = snd_config_imake_integer64(&leaf, id, integer);
if (err < 0)
return err;
err = snd_config_add(father, leaf);
if (err < 0) {
snd_config_delete(leaf);
return err;
}
return 0;
}
static int snd_config_string_add(snd_config_t *father, const char *id, const char *string)
{
int err;
snd_config_t *leaf;
err = snd_config_imake_string(&leaf, id, string);
if (err < 0)
return err;
err = snd_config_add(father, leaf);
if (err < 0) {
snd_config_delete(leaf);
return err;
}
return 0;
}
static int snd_config_compound_add(snd_config_t *father, const char *id, int join,
snd_config_t **node)
{
int err;
snd_config_t *leaf;
err = snd_config_make_compound(&leaf, id, join);
if (err < 0)
return err;
err = snd_config_add(father, leaf);
if (err < 0) {
snd_config_delete(leaf);
return err;
}
*node = leaf;
return 0;
}
#define MAX_USER_TLV_SIZE 64
static char *tlv_to_str(unsigned int *tlv)
{
int i, len = tlv[1] / 4 + 2;
char *s, *p;
if (len >= MAX_USER_TLV_SIZE)
return NULL;
s = malloc(len * 8 + 1);
if (! s)
return NULL;
p = s;
for (i = 0; i < len; i++) {
sprintf(p, "%08x", tlv[i]);
p += 8;
}
return s;
}
static unsigned int *str_to_tlv(const char *s)
{
int i, j, c, len;
unsigned int *tlv;
len = strlen(s);
if (len % 8) /* aligned to 4 bytes (= 8 letters) */
return NULL;
len /= 8;
if (len > MAX_USER_TLV_SIZE)
return NULL;
tlv = malloc(sizeof(int) * len);
if (! tlv)
return NULL;
for (i = 0; i < len; i++) {
tlv[i] = 0;
for (j = 0; j < 8; j++) {
if ((c = hextodigit(*s++)) < 0) {
free(tlv);
return NULL;
}
tlv[i] = (tlv[i] << 4) | c;
}
}
return tlv;
}
/*
* add the TLV string, dB ranges, and dB values to comment fields
*/
static int add_tlv_comments(snd_ctl_t *handle, snd_ctl_elem_id_t *id,
snd_ctl_elem_info_t *info, snd_ctl_elem_value_t *ctl,
snd_config_t *comment)
{
unsigned int tlv[MAX_USER_TLV_SIZE];
unsigned int *db;
long rangemin, rangemax;
long dbmin, dbmax, dbgain;
snd_config_t *value;
unsigned int i, count;
int err;
if (snd_ctl_elem_tlv_read(handle, id, tlv, sizeof(tlv)) < 0)
return 0; /* ignore error */
if (snd_ctl_elem_info_is_tlv_writable(info)) {
char *s = tlv_to_str(tlv);
if (s) {
err = snd_config_string_add(comment, "tlv", s);
free(s);
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
}
}
err = snd_tlv_parse_dB_info(tlv, sizeof(tlv), &db);
if (err <= 0)
return 0;
rangemin = snd_ctl_elem_info_get_min(info);
rangemax = snd_ctl_elem_info_get_max(info);
snd_tlv_get_dB_range(db, rangemin, rangemax, &dbmin, &dbmax);
if (err < 0)
return err;
snd_config_integer_add(comment, "dbmin", dbmin);
snd_config_integer_add(comment, "dbmax", dbmax);
if (snd_ctl_elem_info_get_type(info) == SND_CTL_ELEM_TYPE_INTEGER) {
err = snd_config_compound_add(comment, "dbvalue", 1, &value);
if (err < 0) {
error("snd_config_compound_add: %s", snd_strerror(err));
return err;
}
count = snd_ctl_elem_info_get_count(info);
for (i = 0; i < count; i++) {
err = snd_tlv_convert_to_dB(db, rangemin, rangemax,
snd_ctl_elem_value_get_integer(ctl, i), &dbgain);
if (err < 0) {
error("snd_tlv_convert_to_dB: %s", snd_strerror(err));
return err;
}
err = snd_config_integer_add(value, num_str(i), dbgain);
if (err < 0) {
error("snd_config_integer_add: %s", snd_strerror(err));
return err;
}
}
}
return 0;
}
static int get_control(snd_ctl_t *handle, snd_ctl_elem_id_t *id, snd_config_t *top)
{
snd_ctl_elem_value_t *ctl;
snd_ctl_elem_info_t *info;
snd_config_t *control, *comment, *item = NULL, *value;
const char *s;
char buf[256];
unsigned int idx;
int err;
unsigned int device, subdevice, index;
const char *name;
snd_ctl_elem_type_t type;
unsigned int count;
snd_ctl_elem_value_alloca(&ctl);
snd_ctl_elem_info_alloca(&info);
snd_ctl_elem_info_set_id(info, id);
err = snd_ctl_elem_info(handle, info);
if (err < 0) {
error("Cannot read control info '%s': %s", id_str(id), snd_strerror(err));
return err;
}
if (!snd_ctl_elem_info_is_readable(info))
return 0;
snd_ctl_elem_value_set_id(ctl, id);
err = snd_ctl_elem_read(handle, ctl);
if (err < 0) {
error("Cannot read control '%s': %s", id_str(id), snd_strerror(err));
return err;
}
err = snd_config_compound_add(top, num_str(snd_ctl_elem_info_get_numid(info)), 0, &control);
if (err < 0) {
error("snd_config_compound_add: %s", snd_strerror(err));
return err;
}
err = snd_config_make_compound(&comment, "comment", 0);
if (err < 0) {
error("snd_config_make_compound: %s", snd_strerror(err));
return err;
}
buf[0] = '\0';
buf[1] = '\0';
if (snd_ctl_elem_info_is_readable(info))
strcat(buf, " read");
if (snd_ctl_elem_info_is_writable(info))
strcat(buf, " write");
if (snd_ctl_elem_info_is_inactive(info))
strcat(buf, " inactive");
if (snd_ctl_elem_info_is_volatile(info))
strcat(buf, " volatile");
if (snd_ctl_elem_info_is_locked(info))
strcat(buf, " locked");
if (snd_ctl_elem_info_is_user(info))
strcat(buf, " user");
err = snd_config_string_add(comment, "access", buf + 1);
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
type = snd_ctl_elem_info_get_type(info);
device = snd_ctl_elem_info_get_device(info);
subdevice = snd_ctl_elem_info_get_subdevice(info);
index = snd_ctl_elem_info_get_index(info);
name = snd_ctl_elem_info_get_name(info);
count = snd_ctl_elem_info_get_count(info);
s = snd_ctl_elem_type_name(type);
err = snd_config_string_add(comment, "type", s);
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
err = snd_config_integer_add(comment, "count", count);
if (err < 0) {
error("snd_config_integer_add: %s", snd_strerror(err));
return err;
}
switch (type) {
case SND_CTL_ELEM_TYPE_BOOLEAN:
break;
case SND_CTL_ELEM_TYPE_INTEGER:
{
long min = snd_ctl_elem_info_get_min(info);
long max = snd_ctl_elem_info_get_max(info);
long step = snd_ctl_elem_info_get_step(info);
if (step)
sprintf(buf, "%li - %li (step %li)", min, max, step);
else
sprintf(buf, "%li - %li", min, max);
err = snd_config_string_add(comment, "range", buf);
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
if (snd_ctl_elem_info_is_tlv_readable(info)) {
err = add_tlv_comments(handle, id, info, ctl, comment);
if (err < 0)
return err;
}
break;
}
case SND_CTL_ELEM_TYPE_INTEGER64:
{
long long min = snd_ctl_elem_info_get_min64(info);
long long max = snd_ctl_elem_info_get_max64(info);
long long step = snd_ctl_elem_info_get_step64(info);
if (step)
sprintf(buf, "%lli - %lli (step %lli)", min, max, step);
else
sprintf(buf, "%lli - %lli", min, max);
err = snd_config_string_add(comment, "range", buf);
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
break;
}
case SND_CTL_ELEM_TYPE_ENUMERATED:
{
unsigned int items;
err = snd_config_compound_add(comment, "item", 1, &item);
if (err < 0) {
error("snd_config_compound_add: %s", snd_strerror(err));
return err;
}
items = snd_ctl_elem_info_get_items(info);
for (idx = 0; idx < items; idx++) {
snd_ctl_elem_info_set_item(info, idx);
err = snd_ctl_elem_info(handle, info);
if (err < 0) {
error("snd_ctl_card_info: %s", snd_strerror(err));
return err;
}
err = snd_config_string_add(item, num_str(idx), snd_ctl_elem_info_get_item_name(info));
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
}
break;
}
default:
break;
}
s = snd_ctl_elem_iface_name(snd_ctl_elem_info_get_interface(info));
err = snd_config_string_add(control, "iface", s);
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
if (device != 0) {
err = snd_config_integer_add(control, "device", device);
if (err < 0) {
error("snd_config_integer_add: %s", snd_strerror(err));
return err;
}
}
if (subdevice != 0) {
err = snd_config_integer_add(control, "subdevice", subdevice);
if (err < 0) {
error("snd_config_integer_add: %s", snd_strerror(err));
return err;
}
}
err = snd_config_string_add(control, "name", name);
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
if (index != 0) {
err = snd_config_integer_add(control, "index", index);
if (err < 0) {
error("snd_config_integer_add: %s", snd_strerror(err));
return err;
}
}
switch (type) {
case SND_CTL_ELEM_TYPE_BYTES:
case SND_CTL_ELEM_TYPE_IEC958:
{
size_t size = type == SND_CTL_ELEM_TYPE_BYTES ?
count : sizeof(snd_aes_iec958_t);
char buf[size * 2 + 1];
char *p = buf;
char *hex = "0123456789abcdef";
const unsigned char *bytes =
(const unsigned char *)snd_ctl_elem_value_get_bytes(ctl);
for (idx = 0; idx < size; idx++) {
int v = bytes[idx];
*p++ = hex[v >> 4];
*p++ = hex[v & 0x0f];
}
*p = '\0';
err = snd_config_string_add(control, "value", buf);
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
goto finish;
}
default:
break;
}
if (count == 1) {
switch (type) {
case SND_CTL_ELEM_TYPE_BOOLEAN:
err = snd_config_string_add(control, "value", snd_ctl_elem_value_get_boolean(ctl, 0) ? "true" : "false");
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
goto finish;
case SND_CTL_ELEM_TYPE_INTEGER:
err = snd_config_integer_add(control, "value", snd_ctl_elem_value_get_integer(ctl, 0));
if (err < 0) {
error("snd_config_integer_add: %s", snd_strerror(err));
return err;
}
goto finish;
case SND_CTL_ELEM_TYPE_INTEGER64:
err = snd_config_integer64_add(control, "value", snd_ctl_elem_value_get_integer64(ctl, 0));
if (err < 0) {
error("snd_config_integer64_add: %s", snd_strerror(err));
return err;
}
goto finish;
case SND_CTL_ELEM_TYPE_ENUMERATED:
{
unsigned int v = snd_ctl_elem_value_get_enumerated(ctl, 0);
snd_config_t *c;
err = snd_config_search(item, num_str(v), &c);
if (err == 0) {
err = snd_config_get_string(c, &s);
assert(err == 0);
err = snd_config_string_add(control, "value", s);
} else {
err = snd_config_integer_add(control, "value", v);
}
if (err < 0)
error("snd_config add: %s", snd_strerror(err));
goto finish;
}
default:
error("Unknown control type: %d\n", type);
return -EINVAL;
}
}
err = snd_config_compound_add(control, "value", 1, &value);
if (err < 0) {
error("snd_config_compound_add: %s", snd_strerror(err));
return err;
}
switch (type) {
case SND_CTL_ELEM_TYPE_BOOLEAN:
for (idx = 0; idx < count; idx++) {
err = snd_config_string_add(value, num_str(idx), snd_ctl_elem_value_get_boolean(ctl, idx) ? "true" : "false");
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
}
break;
case SND_CTL_ELEM_TYPE_INTEGER:
for (idx = 0; idx < count; idx++) {
err = snd_config_integer_add(value, num_str(idx), snd_ctl_elem_value_get_integer(ctl, idx));
if (err < 0) {
error("snd_config_integer_add: %s", snd_strerror(err));
return err;
}
}
break;
case SND_CTL_ELEM_TYPE_INTEGER64:
for (idx = 0; idx < count; idx++) {
err = snd_config_integer64_add(value, num_str(idx), snd_ctl_elem_value_get_integer64(ctl, idx));
if (err < 0) {
error("snd_config_integer64_add: %s", snd_strerror(err));
return err;
}
}
break;
case SND_CTL_ELEM_TYPE_ENUMERATED:
for (idx = 0; idx < count; idx++) {
unsigned int v = snd_ctl_elem_value_get_enumerated(ctl, idx);
snd_config_t *c;
err = snd_config_search(item, num_str(v), &c);
if (err == 0) {
err = snd_config_get_string(c, &s);
assert(err == 0);
err = snd_config_string_add(value, num_str(idx), s);
} else {
err = snd_config_integer_add(value, num_str(idx), v);
}
if (err < 0) {
error("snd_config add: %s", snd_strerror(err));
return err;
}
}
break;
default:
error("Unknown control type: %d\n", type);
return -EINVAL;
}
finish:
err = snd_config_add(control, comment);
if (err < 0) {
error("snd_config_add: %s", snd_strerror(err));
return err;
}
return 0;
}
static int get_controls(int cardno, snd_config_t *top)
{
snd_ctl_t *handle;
snd_ctl_card_info_t *info;
snd_config_t *state, *card, *control;
snd_ctl_elem_list_t *list;
snd_ctl_elem_id_t *elem_id;
unsigned int idx;
int err;
char name[32];
unsigned int count;
const char *id;
snd_ctl_card_info_alloca(&info);
snd_ctl_elem_list_alloca(&list);
snd_ctl_elem_id_alloca(&elem_id);
sprintf(name, "hw:%d", cardno);
err = snd_ctl_open(&handle, name, SND_CTL_READONLY);
if (err < 0) {
error("snd_ctl_open error: %s", snd_strerror(err));
return err;
}
err = snd_ctl_card_info(handle, info);
if (err < 0) {
error("snd_ctl_card_info error: %s", snd_strerror(err));
goto _close;
}
id = snd_ctl_card_info_get_id(info);
err = snd_config_search(top, "state", &state);
if (err == 0 &&
snd_config_get_type(state) != SND_CONFIG_TYPE_COMPOUND) {
error("config state node is not a compound");
err = -EINVAL;
goto _close;
}
if (err < 0) {
err = snd_config_compound_add(top, "state", 1, &state);
if (err < 0) {
error("snd_config_compound_add: %s", snd_strerror(err));
goto _close;
}
}
err = snd_config_search(state, id, &card);
if (err == 0 &&
snd_config_get_type(card) != SND_CONFIG_TYPE_COMPOUND) {
error("config state.%s node is not a compound", id);
err = -EINVAL;
goto _close;
}
if (err < 0) {
err = snd_config_compound_add(state, id, 0, &card);
if (err < 0) {
error("snd_config_compound_add: %s", snd_strerror(err));
goto _close;
}
}
err = snd_config_search(card, "control", &control);
if (err == 0) {
err = snd_config_delete(control);
if (err < 0) {
error("snd_config_delete: %s", snd_strerror(err));
goto _close;
}
}
err = snd_ctl_elem_list(handle, list);
if (err < 0) {
error("Cannot determine controls: %s", snd_strerror(err));
goto _close;
}
count = snd_ctl_elem_list_get_count(list);
err = snd_config_compound_add(card, "control", count > 0, &control);
if (err < 0) {
error("snd_config_compound_add: %s", snd_strerror(err));
goto _close;
}
if (count == 0) {
err = 0;
goto _close;
}
snd_ctl_elem_list_set_offset(list, 0);
if (snd_ctl_elem_list_alloc_space(list, count) < 0) {
error("No enough memory...");
goto _close;
}
if ((err = snd_ctl_elem_list(handle, list)) < 0) {
error("Cannot determine controls (2): %s", snd_strerror(err));
goto _free;
}
for (idx = 0; idx < count; ++idx) {
snd_ctl_elem_list_get_id(list, idx, elem_id);
err = get_control(handle, elem_id, control);
if (err < 0)
goto _free;
}
err = 0;
_free:
snd_ctl_elem_list_free_space(list);
_close:
snd_ctl_close(handle);
return err;
}
static long config_iface(snd_config_t *n)
{
long i;
long long li;
snd_ctl_elem_iface_t idx;
const char *str;
switch (snd_config_get_type(n)) {
case SND_CONFIG_TYPE_INTEGER:
if (snd_config_get_integer(n, &i) < 0)
return -1;
return i;
case SND_CONFIG_TYPE_INTEGER64:
if (snd_config_get_integer64(n, &li) < 0)
return -1;
return li;
case SND_CONFIG_TYPE_STRING:
if (snd_config_get_string(n, &str) < 0)
return -1;
break;
default:
return -1;
}
for (idx = 0; idx <= SND_CTL_ELEM_IFACE_LAST; idx++) {
if (strcasecmp(snd_ctl_elem_iface_name(idx), str) == 0)
return idx;
}
return -1;
}
static int config_bool(snd_config_t *n, int doit)
{
const char *str;
long val;
long long lval;
switch (snd_config_get_type(n)) {
case SND_CONFIG_TYPE_INTEGER:
if (snd_config_get_integer(n, &val) < 0)
return -1;
if (val < 0 || val > 1)
return -1;
return val;
case SND_CONFIG_TYPE_INTEGER64:
if (snd_config_get_integer64(n, &lval) < 0)
return -1;
if (lval < 0 || lval > 1)
return -1;
return (int) lval;
case SND_CONFIG_TYPE_STRING:
if (snd_config_get_string(n, &str) < 0)
return -1;
break;
case SND_CONFIG_TYPE_COMPOUND:
if (!force_restore || !doit)
return -1;
n = snd_config_iterator_entry(snd_config_iterator_first(n));
return config_bool(n, doit);
default:
return -1;
}
if (strcmp(str, "on") == 0 || strcmp(str, "true") == 0)
return 1;
if (strcmp(str, "off") == 0 || strcmp(str, "false") == 0)
return 0;
return -1;
}
static int config_enumerated(snd_config_t *n, snd_ctl_t *handle,
snd_ctl_elem_info_t *info, int doit)
{
const char *str;
long val;
long long lval;
unsigned int idx, items;
switch (snd_config_get_type(n)) {
case SND_CONFIG_TYPE_INTEGER:
if (snd_config_get_integer(n, &val) < 0)
return -1;
return val;
case SND_CONFIG_TYPE_INTEGER64:
if (snd_config_get_integer64(n, &lval) < 0)
return -1;
return (int) lval;
case SND_CONFIG_TYPE_STRING:
if (snd_config_get_string(n, &str) < 0)
return -1;
break;
case SND_CONFIG_TYPE_COMPOUND:
if (!force_restore || !doit)
return -1;
n = snd_config_iterator_entry(snd_config_iterator_first(n));
return config_enumerated(n, handle, info, doit);
default:
return -1;
}
items = snd_ctl_elem_info_get_items(info);
for (idx = 0; idx < items; idx++) {
int err;
snd_ctl_elem_info_set_item(info, idx);
err = snd_ctl_elem_info(handle, info);
if (err < 0) {
error("snd_ctl_elem_info: %s", snd_strerror(err));
return err;
}
if (strcmp(str, snd_ctl_elem_info_get_item_name(info)) == 0)
return idx;
}
return -1;
}
static int config_integer(snd_config_t *n, long *val, int doit)
{
int err = snd_config_get_integer(n, val);
if (err < 0 && force_restore && doit) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_COMPOUND)
return err;
n = snd_config_iterator_entry(snd_config_iterator_first(n));
return config_integer(n, val, doit);
}
return err;
}
static int config_integer64(snd_config_t *n, long long *val, int doit)
{
int err = snd_config_get_integer64(n, val);
if (err < 0 && force_restore && doit) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_COMPOUND)
return err;
n = snd_config_iterator_entry(snd_config_iterator_first(n));
return config_integer64(n, val, doit);
}
return err;
}
static int check_comment_access(snd_config_t *conf, const char *str)
{
snd_config_iterator_t i, next;
snd_config_for_each(i, next, conf) {
snd_config_t *n = snd_config_iterator_entry(i);
const char *id, *s;
if (snd_config_get_id(n, &id) < 0)
continue;
if (strcmp(id, "access") == 0) {
if (snd_config_get_string(n, &s) < 0)
return 0;
if (strstr(s, str))
return 1;
}
}
return 0;
}
/*
* get the item type from the given comment config
*/
static int get_comment_type(snd_config_t *n)
{
static const snd_ctl_elem_type_t types[] = {
SND_CTL_ELEM_TYPE_BOOLEAN,
SND_CTL_ELEM_TYPE_INTEGER,
SND_CTL_ELEM_TYPE_ENUMERATED,
SND_CTL_ELEM_TYPE_BYTES,
SND_CTL_ELEM_TYPE_IEC958,
SND_CTL_ELEM_TYPE_INTEGER64,
};
const char *type;
unsigned int i;
if (snd_config_get_string(n, &type) < 0)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(types); ++i)
if (strcmp(type, snd_ctl_elem_type_name(types[i])) == 0)
return types[i];
return -EINVAL;
}
/*
* get the value range from the given comment config
*/
static int get_comment_range(snd_config_t *n, int ctype,
long *imin, long *imax, long *istep)
{
const char *s;
int err;
if (snd_config_get_string(n, &s) < 0)
return -EINVAL;
switch (ctype) {
case SND_CTL_ELEM_TYPE_INTEGER:
err = sscanf(s, "%li - %li (step %li)", imin, imax, istep);
if (err != 3) {
istep = 0;
err = sscanf(s, "%li - %li", imin, imax);
if (err != 2)
return -EINVAL;
}
break;
default:
return -EINVAL;
}
return 0;
}
struct string_array {
unsigned int count;
const char **strings;
};
static int get_comment_items(snd_config_t *n, struct string_array *items)
{
snd_config_iterator_t it, next;
unsigned int i;
int err;
snd_config_for_each(it, next, n) {
snd_config_t *item = snd_config_iterator_entry(it);
const char *id;
unsigned int numid;
if (snd_config_get_id(item, &id) < 0)
return -EINVAL;
numid = atoi(id);
if (numid > 999999)
return -EINVAL;
if (numid >= items->count) {
const char **strings = realloc(items->strings, (numid + 1) * sizeof(char *));
if (!strings)
return -ENOMEM;
for (i = items->count; i < numid + 1; ++i)
strings[i] = NULL;
items->count = numid + 1;
items->strings = strings;
}
err = snd_config_get_string(item, &items->strings[numid]);
if (err < 0)
return err;
}
for (i = 0; i < items->count; ++i)
if (!items->strings[i])
return -EINVAL;
return 0;
}
static int add_user_control(snd_ctl_t *handle, snd_ctl_elem_info_t *info, snd_config_t *conf)
{
snd_ctl_elem_id_t *id;
snd_config_iterator_t i, next;
long imin, imax, istep;
snd_ctl_elem_type_t ctype;
unsigned int count;
struct string_array enum_items;
int err;
unsigned int *tlv;
imin = imax = istep = 0;
count = 0;
ctype = SND_CTL_ELEM_TYPE_NONE;
enum_items.count = 0;
enum_items.strings = NULL;
tlv = NULL;
snd_config_for_each(i, next, conf) {
snd_config_t *n = snd_config_iterator_entry(i);
const char *id;
if (snd_config_get_id(n, &id) < 0)
continue;
if (strcmp(id, "type") == 0) {
err = get_comment_type(n);
if (err < 0)
goto error;
ctype = err;
continue;
}
if (strcmp(id, "range") == 0) {
err = get_comment_range(n, ctype, &imin, &imax, &istep);
if (err < 0)
goto error;
continue;
}
if (strcmp(id, "count") == 0) {
long v;
if ((err = snd_config_get_integer(n, &v)) < 0)
goto error;
count = v;
continue;
}
if (strcmp(id, "item") == 0) {
err = get_comment_items(n, &enum_items);
if (err < 0)
goto error;
continue;
}
if (strcmp(id, "tlv") == 0) {
const char *s;
if ((err = snd_config_get_string(n, &s)) < 0)
goto error;
if (tlv)
free(tlv);
if ((tlv = str_to_tlv(s)) == NULL) {
err = -EINVAL;
goto error;
}
continue;
}
}
snd_ctl_elem_id_alloca(&id);
snd_ctl_elem_info_get_id(info, id);
if (count <= 0)
count = 1;
switch (ctype) {
case SND_CTL_ELEM_TYPE_INTEGER:
if (imin > imax || istep > imax - imin) {
err = -EINVAL;
goto error;
}
err = snd_ctl_elem_add_integer(handle, id, count, imin, imax, istep);
if (err < 0)
goto error;
if (tlv)
snd_ctl_elem_tlv_write(handle, id, tlv);
break;
case SND_CTL_ELEM_TYPE_BOOLEAN:
err = snd_ctl_elem_add_boolean(handle, id, count);
break;
case SND_CTL_ELEM_TYPE_ENUMERATED:
err = snd_ctl_elem_add_enumerated(handle, id, count,
enum_items.count, enum_items.strings);
break;
case SND_CTL_ELEM_TYPE_IEC958:
err = snd_ctl_elem_add_iec958(handle, id);
break;
default:
err = -EINVAL;
break;
}
error:
free(tlv);
free(enum_items.strings);
if (err < 0)
return err;
return snd_ctl_elem_info(handle, info);
}
/*
* check whether the config item has the same of compatible type
*/
static int check_comment_type(snd_config_t *conf, int type)
{
snd_config_t *n;
int ctype;
if (snd_config_search(conf, "type", &n) < 0)
return 0; /* not defined */
ctype = get_comment_type(n);
if (ctype == type)
return 0;
if ((ctype == SND_CTL_ELEM_TYPE_BOOLEAN ||
ctype == SND_CTL_ELEM_TYPE_INTEGER ||
ctype == SND_CTL_ELEM_TYPE_INTEGER64 ||
ctype == SND_CTL_ELEM_TYPE_ENUMERATED) &&
(type == SND_CTL_ELEM_TYPE_BOOLEAN ||
type == SND_CTL_ELEM_TYPE_INTEGER ||
type == SND_CTL_ELEM_TYPE_INTEGER64 ||
type == SND_CTL_ELEM_TYPE_ENUMERATED))
return 0; /* OK, compatible */
return -EINVAL;
}
/*
* convert from an old value to a new value with the same dB level
*/
static int convert_to_new_db(snd_config_t *value, long omin, long omax,
long nmin, long nmax,
long odbmin, long odbmax,
snd_config_t *comment, const char *index,
snd_ctl_t *device, snd_ctl_elem_id_t *id,
int doit)
{
snd_config_t *db_node;
long db, val;
int err;
if (snd_config_searchv(comment, &db_node, "dbvalue", index, NULL) < 0 ||
snd_config_get_integer(db_node, &db) < 0) {
err = config_integer(value, &val, doit);
if (err < 0)
return err;
if (val < omin || val > omax)
return -EINVAL;
db = ((val - omin) * (odbmax - odbmin)) / (omax - omin) + odbmin;
}
err = snd_ctl_convert_from_dB(device, id, db, &val, db > 0);
if (err < 0)
return err;
if (val < nmin)
val = nmin;
else if (val > nmax)
val = nmax;
return snd_config_set_integer(value, val);
}
/*
* compare the current value range with the old range in comments.
* also, if dB information is available, try to compare them.
* if any change occurs, try to keep the same dB level.
*/
static int check_comment_range(snd_ctl_t *handle, snd_config_t *conf,
snd_ctl_elem_info_t *info, snd_config_t *value,
int doit)
{
snd_config_t *n;
long omin, omax, ostep;
long nmin, nmax;
long odbmin, odbmax;
long ndbmin, ndbmax;
snd_ctl_elem_id_t *id;
if (snd_config_search(conf, "range", &n) < 0)
return 0;
if (get_comment_range(n, SND_CTL_ELEM_TYPE_INTEGER,
&omin, &omax, &ostep) < 0)
return 0;
nmin = snd_ctl_elem_info_get_min(info);
nmax = snd_ctl_elem_info_get_max(info);
if (omin != nmin && omax != nmax) {
/* Hey, the range mismatches */
if (!force_restore || !doit)
return -EINVAL;
}
if (omin >= omax || nmin >= nmax)
return 0; /* invalid values */
if (snd_config_search(conf, "dbmin", &n) < 0)
return 0;
if (config_integer(n, &odbmin, doit) < 0)
return 0;
if (snd_config_search(conf, "dbmax", &n) < 0)
return 0;
if (config_integer(n, &odbmax, doit) < 0)
return 0;
if (odbmin >= odbmax)
return 0; /* invalid values */
snd_ctl_elem_id_alloca(&id);
snd_ctl_elem_info_get_id(info, id);
if (snd_ctl_get_dB_range(handle, id, &ndbmin, &ndbmax) < 0)
return 0;
if (ndbmin >= ndbmax)
return 0; /* invalid values */
if (omin == nmin && omax == nmax &&
odbmin == ndbmin && odbmax == ndbmax)
return 0; /* OK, identical one */
/* Let's guess the current value from dB range */
if (snd_config_get_type(value) == SND_CONFIG_TYPE_COMPOUND) {
snd_config_iterator_t i, next;
snd_config_for_each(i, next, value) {
snd_config_t *n = snd_config_iterator_entry(i);
const char *idxstr;
if (snd_config_get_id(n, &idxstr) < 0)
continue;
convert_to_new_db(n, omin, omax, nmin, nmax,
odbmin, odbmax, conf, idxstr,
handle, id, doit);
}
} else
convert_to_new_db(value, omin, omax, nmin, nmax,
odbmin, odbmax, conf, "0",
handle, id, doit);
return 0;
}
static int restore_config_value(snd_ctl_t *handle, snd_ctl_elem_info_t *info,
snd_ctl_elem_type_t type,
snd_config_t *value,
snd_ctl_elem_value_t *ctl, int idx,
int doit)
{
long val;
long long lval;
int err;
switch (type) {
case SND_CTL_ELEM_TYPE_BOOLEAN:
val = config_bool(value, doit);
if (val >= 0) {
snd_ctl_elem_value_set_boolean(ctl, idx, val);
return 1;
}
break;
case SND_CTL_ELEM_TYPE_INTEGER:
err = config_integer(value, &val, doit);
if (err == 0) {
snd_ctl_elem_value_set_integer(ctl, idx, val);
return 1;
}
break;
case SND_CTL_ELEM_TYPE_INTEGER64:
err = config_integer64(value, &lval, doit);
if (err == 0) {
snd_ctl_elem_value_set_integer64(ctl, idx, lval);
return 1;
}
break;
case SND_CTL_ELEM_TYPE_ENUMERATED:
val = config_enumerated(value, handle, info, doit);
if (val >= 0) {
snd_ctl_elem_value_set_enumerated(ctl, idx, val);
return 1;
}
break;
case SND_CTL_ELEM_TYPE_BYTES:
case SND_CTL_ELEM_TYPE_IEC958:
break;
default:
cerror(doit, "Unknow control type: %d", type);
return -EINVAL;
}
return 0;
}
static int restore_config_value2(snd_ctl_t *handle, snd_ctl_elem_info_t *info,
snd_ctl_elem_type_t type,
snd_config_t *value,
snd_ctl_elem_value_t *ctl, int idx,
unsigned int numid, int doit)
{
int err = restore_config_value(handle, info, type, value, ctl, idx, doit);
long val;
if (err != 0)
return err;
switch (type) {
case SND_CTL_ELEM_TYPE_BYTES:
case SND_CTL_ELEM_TYPE_IEC958:
err = snd_config_get_integer(value, &val);
if (err < 0 || val < 0 || val > 255) {
cerror(doit, "bad control.%d.value.%d content", numid, idx);
return force_restore && doit ? 0 : -EINVAL;
}
snd_ctl_elem_value_set_byte(ctl, idx, val);
return 1;
default:
break;
}
return 0;
}
static int parse_config_id(snd_config_t *control, snd_ctl_elem_id_t *id,
snd_config_t **comment, snd_config_t **value, int doit)
{
snd_config_iterator_t i, next;
const char *numid;
snd_ctl_elem_iface_t iface = -1;
long device = -1;
long subdevice = -1;
const char *name = NULL;
long index = -1;
snd_ctl_elem_id_clear(id);
if (snd_config_get_id(control, &numid) < 0)
return -EINVAL;
snd_config_for_each(i, next, control) {
snd_config_t *n = snd_config_iterator_entry(i);
const char *fld;
if (snd_config_get_id(n, &fld) < 0)
continue;
if (strcmp(fld, "comment") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_COMPOUND) {
cerror(doit, "control.%s.%s is invalid", numid, fld);
return -EINVAL;
}
if (comment)
*comment = n;
continue;
}
if (strcmp(fld, "iface") == 0) {
iface = (snd_ctl_elem_iface_t)config_iface(n);
if (iface < 0)
return -EINVAL;
continue;
}
if (strcmp(fld, "device") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_INTEGER) {
cerror(doit, "control.%s.%s is invalid", numid, fld);
return -EINVAL;
}
if (snd_config_get_integer(n, &device) < 0)
return -EINVAL;
continue;
}
if (strcmp(fld, "subdevice") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_INTEGER) {
cerror(doit, "control.%s.%s is invalid", numid, fld);
return -EINVAL;
}
if (snd_config_get_integer(n, &subdevice) < 0)
return -EINVAL;
continue;
}
if (strcmp(fld, "name") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_STRING) {
cerror(doit, "control.%s.%s is invalid", numid, fld);
return -EINVAL;
}
if (snd_config_get_string(n, &name) < 0)
return -EINVAL;
continue;
}
if (strcmp(fld, "index") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_INTEGER) {
cerror(doit, "control.%s.%s is invalid", numid, fld);
return -EINVAL;
}
if (snd_config_get_integer(n, &index) < 0)
return -EINVAL;
continue;
}
if (strcmp(fld, "value") == 0) {
if (value)
*value = n;
continue;
}
cerror(doit, "unknown control.%s.%s field", numid, fld);
}
if (device < 0)
device = 0;
if (subdevice < 0)
subdevice = 0;
if (index < 0)
index = 0;
snd_ctl_elem_id_set_interface(id, iface);
snd_ctl_elem_id_set_device(id, device);
snd_ctl_elem_id_set_subdevice(id, subdevice);
snd_ctl_elem_id_set_name(id, name);
snd_ctl_elem_id_set_index(id, index);
return 0;
}
static int set_control(snd_ctl_t *handle, snd_config_t *control, int doit)
{
snd_ctl_elem_value_t *ctl;
snd_ctl_elem_info_t *info;
snd_config_iterator_t i, next;
snd_ctl_elem_id_t *elem_id, *elem_id1;
unsigned int numid;
snd_ctl_elem_type_t type;
unsigned int count;
snd_config_t *value = NULL;
snd_config_t *comment = NULL;
unsigned int idx;
int err;
char *set;
const char *id;
snd_ctl_elem_id_alloca(&elem_id);
snd_ctl_elem_id_alloca(&elem_id1);
snd_ctl_elem_value_alloca(&ctl);
snd_ctl_elem_info_alloca(&info);
if (snd_config_get_type(control) != SND_CONFIG_TYPE_COMPOUND) {
cerror(doit, "control is not a compound");
return -EINVAL;
}
err = snd_config_get_id(control, &id);
if (err < 0) {
cerror(doit, "unable to get id");
return -EINVAL;
}
numid = atoi(id);
err = parse_config_id(control, elem_id, &comment, &value, doit);
if (err < 0)
return err;
err = -EINVAL;
if (!force_restore) {
snd_ctl_elem_info_set_numid(info, numid);
err = snd_ctl_elem_info(handle, info);
}
id = snd_ctl_elem_id_get_name(elem_id);
if (err < 0 && id && id[0]) {
snd_ctl_elem_info_set_id(info, elem_id);
err = snd_ctl_elem_info(handle, info);
if (err < 0 && comment && check_comment_access(comment, "user")) {
err = add_user_control(handle, info, comment);
if (err < 0) {
cerror(doit, "failed to add user control #%d (%s)",
numid, snd_strerror(err));
return err;
}
}
}
if (err < 0) {
cerror(doit, "failed to obtain info for control #%d (%s)", numid, snd_strerror(err));
return -ENOENT;
}
count = snd_ctl_elem_info_get_count(info);
snd_ctl_elem_info_get_id(info, elem_id1);
type = snd_ctl_elem_info_get_type(info);
err = 0;
if (err |= !force_restore && numid != snd_ctl_elem_id_get_numid(elem_id1))
cerror(doit, "warning: numid mismatch (%u/%u) for control #%d",
(unsigned int)numid, snd_ctl_elem_id_get_numid(elem_id1), numid);
if (err |= snd_ctl_elem_id_get_interface(elem_id) != snd_ctl_elem_id_get_interface(elem_id1))
cerror(doit, "warning: iface mismatch (%d/%d) for control #%d",
(int)snd_ctl_elem_id_get_interface(elem_id),
(int)snd_ctl_elem_id_get_interface(elem_id1),
numid);
if (err |= snd_ctl_elem_id_get_device(elem_id) != snd_ctl_elem_id_get_device(elem_id1))
cerror(doit, "warning: device mismatch (%u/%u) for control #%d",
snd_ctl_elem_id_get_device(elem_id),
snd_ctl_elem_id_get_device(elem_id1),
numid);
if (err |= snd_ctl_elem_id_get_subdevice(elem_id) != snd_ctl_elem_id_get_subdevice(elem_id1))
cerror(doit, "warning: subdevice mismatch (%u/%%u) for control #%d",
snd_ctl_elem_id_get_subdevice(elem_id),
snd_ctl_elem_id_get_subdevice(elem_id1),
numid);
if (err |= strcmp(snd_ctl_elem_id_get_name(elem_id), snd_ctl_elem_id_get_name(elem_id1)))
cerror(doit, "warning: name mismatch (%s/%s) for control #%d",
snd_ctl_elem_id_get_name(elem_id),
snd_ctl_elem_id_get_name(elem_id1),
numid);
if (err |= snd_ctl_elem_id_get_index(elem_id) != snd_ctl_elem_id_get_index(elem_id1))
cerror(doit, "warning: index mismatch (%u/%u) for control #%d",
snd_ctl_elem_id_get_index(elem_id),
snd_ctl_elem_id_get_index(elem_id1),
numid);
if (err) {
cerror(doit, "failed to obtain info for control #%d (%s)", numid, snd_strerror(err));
return -ENOENT;
}
if (comment) {
if (check_comment_type(comment, type) < 0)
cerror(doit, "incompatible field type for control #%d", numid);
if (type == SND_CTL_ELEM_TYPE_INTEGER) {
if (check_comment_range(handle, comment, info, value, doit) < 0) {
cerror(doit, "value range mismatch for control #%d",
numid);
return -EINVAL;
}
}
/* inactive controls are not restored */
if (comment && check_comment_access(comment, "inactive"))
return 0;
}
if (snd_ctl_elem_info_is_inactive(info) ||
!snd_ctl_elem_info_is_writable(info))
return 0;
snd_ctl_elem_value_set_numid(ctl, snd_ctl_elem_id_get_numid(elem_id1));
if (count == 1) {
err = restore_config_value(handle, info, type, value, ctl, 0, doit);
if (err < 0)
return err;
if (err > 0)
goto _ok;
}
switch (type) {
case SND_CTL_ELEM_TYPE_BYTES:
case SND_CTL_ELEM_TYPE_IEC958:
{
const char *buf;
err = snd_config_get_string(value, &buf);
if (err >= 0) {
int c1 = 0;
int len = strlen(buf);
unsigned int idx = 0;
int size = type == SND_CTL_ELEM_TYPE_BYTES ?
count : sizeof(snd_aes_iec958_t);
if (size * 2 != len) {
cerror(doit, "bad control.%d.value contents\n", numid);
return -EINVAL;
}
while (*buf) {
int c = *buf++;
if ((c = hextodigit(c)) < 0) {
cerror(doit, "bad control.%d.value contents\n", numid);
return -EINVAL;
}
if (idx % 2 == 1)
snd_ctl_elem_value_set_byte(ctl, idx / 2, c1 << 4 | c);
else
c1 = c;
idx++;
}
goto _ok;
}
}
default:
break;
}
if (snd_config_get_type(value) != SND_CONFIG_TYPE_COMPOUND) {
if (!force_restore || !doit) {
cerror(doit, "bad control.%d.value type", numid);
return -EINVAL;
}
for (idx = 0; idx < count; ++idx) {
err = restore_config_value2(handle, info, type, value,
ctl, idx, numid, doit);
if (err < 0)
return err;
}
goto _ok;
}
set = (char*) alloca(count);
memset(set, 0, count);
snd_config_for_each(i, next, value) {
snd_config_t *n = snd_config_iterator_entry(i);
const char *id;
if (snd_config_get_id(n, &id) < 0)
continue;
idx = atoi(id);
if (idx >= count || set[idx]) {
cerror(doit, "bad control.%d.value index", numid);
if (!force_restore || !doit)
return -EINVAL;
continue;
}
err = restore_config_value2(handle, info, type, n,
ctl, idx, numid, doit);
if (err < 0)
return err;
if (err > 0)
set[idx] = 1;
}
for (idx = 0; idx < count; ++idx) {
if (!set[idx]) {
cerror(doit, "control.%d.value.%d is not specified", numid, idx);
if (!force_restore || !doit)
return -EINVAL;
}
}
_ok:
err = doit ? snd_ctl_elem_write(handle, ctl) : 0;
if (err < 0) {
char *s = snd_ctl_ascii_elem_id_get(elem_id1);
error("Cannot write control '%s' : %s", s, snd_strerror(err));
free(s);
return err;
} else if (debugflag) {
char *s = snd_ctl_ascii_elem_id_get(elem_id1);
dbg("control '%s' restored", s);
free(s);
}
return 0;
}
static int set_controls(int card, snd_config_t *top, int doit)
{
snd_ctl_t *handle;
snd_ctl_card_info_t *info;
snd_ctl_elem_list_t *list;
snd_ctl_elem_info_t *elem_info;
snd_ctl_elem_id_t *elem_id;
snd_config_t *control;
snd_config_iterator_t i, next;
int err, controls1 = -1, controls2 = -1;
unsigned int idx, count = 0;
char name[32], tmpid[16];
const char *id;
snd_ctl_card_info_alloca(&info);
snd_ctl_elem_list_alloca(&list);
snd_ctl_elem_info_alloca(&elem_info);
snd_ctl_elem_id_alloca(&elem_id);
sprintf(name, "hw:%d", card);
dbg("device='%s', doit=%i", name, doit);
err = snd_ctl_open(&handle, name, 0);
if (err < 0) {
error("snd_ctl_open error: %s", snd_strerror(err));
return err;
}
err = snd_ctl_card_info(handle, info);
if (err < 0) {
error("snd_ctl_card_info error: %s", snd_strerror(err));
goto _close;
}
id = snd_ctl_card_info_get_id(info);
dbg("card-info-id: '%s'", id);
err = snd_config_searchv(top, &control, "state", id, "control", 0);
if (err < 0) {
if (force_restore) {
sprintf(tmpid, "card%d", card);
err = snd_config_searchv(top, &control, "state", tmpid, "control", 0);
if (! err)
id = tmpid;
}
if (err < 0) {
fprintf(stderr, "No state is present for card %s\n", id);
goto _close;
}
id = tmpid;
}
if (snd_config_get_type(control) != SND_CONFIG_TYPE_COMPOUND) {
cerror(doit, "state.%s.control is not a compound\n", id);
return -EINVAL;
}
controls1 = 0;
snd_config_for_each(i, next, control) {
snd_config_t *n = snd_config_iterator_entry(i);
err = set_control(handle, n, doit);
if (err < 0 && (!force_restore || !doit))
goto _close;
controls1++;
}
if (doit)
goto _close;
err = snd_ctl_elem_list(handle, list);
if (err < 0) {
error("Cannot determine controls: %s", snd_strerror(err));
goto _close;
}
count = snd_ctl_elem_list_get_count(list);
dbg("list count: %u", count);
if (count == 0)
goto _check;
snd_ctl_elem_list_set_offset(list, 0);
if (snd_ctl_elem_list_alloc_space(list, count) < 0) {
error("No enough memory...");
goto _close;
}
if ((err = snd_ctl_elem_list(handle, list)) < 0) {
error("Cannot determine controls (2): %s", snd_strerror(err));
goto _free;
}
controls2 = 0;
/* skip non-readable elements */
for (idx = 0; idx < count; ++idx) {
snd_ctl_elem_info_clear(elem_info);
snd_ctl_elem_list_get_id(list, idx, elem_id);
snd_ctl_elem_info_set_id(elem_info, elem_id);
if (snd_ctl_elem_info(handle, elem_info) == 0) {
if (!snd_ctl_elem_info_is_readable(elem_info))
continue;
controls2++;
}
}
/* check if we have additional controls in driver */
/* in this case we should go through init procedure */
_check:
dbg("controls1=%i controls2=%i", controls1, controls2);
if (controls1 >= 0 && controls1 != controls2) {
/* not very informative */
/* but value is used for check only */
err = -EAGAIN;
dbg("config controls mismatch with hardware?");
}
_free:
if (count > 0)
snd_ctl_elem_list_free_space(list);
_close:
snd_ctl_close(handle);
dbg("result code: %i", err);
return err;
}
int save_state(const char *file, const char *cardname)
{
int err;
snd_config_t *config;
snd_input_t *in;
snd_output_t *out;
int stdio;
char *nfile = NULL;
int lock_fd = -EINVAL;
struct snd_card_iterator iter;
err = snd_config_top(&config);
if (err < 0) {
error("snd_config_top error: %s", snd_strerror(err));
return err;
}
stdio = !strcmp(file, "-");
if (!stdio) {
nfile = malloc(strlen(file) + 5);
if (nfile == NULL) {
error("No enough memory...");
err = -ENOMEM;
goto out;
}
strcpy(nfile, file);
strcat(nfile, ".new");
lock_fd = state_lock(file, LOCK_TIMEOUT);
if (lock_fd < 0) {
err = lock_fd;
goto out;
}
}
if (!stdio && (err = snd_input_stdio_open(&in, file, "r")) >= 0) {
err = snd_config_load(config, in);
snd_input_close(in);
#if 0
if (err < 0) {
error("snd_config_load error: %s", snd_strerror(err));
goto out;
}
#endif
}
err = snd_card_iterator_sinit(&iter, cardname);
if (err < 0)
goto out;
while (snd_card_iterator_next(&iter)) {
if ((err = get_controls(iter.card, config)))
goto out;
}
if (iter.first) {
err = snd_card_iterator_error(&iter);
goto out;
}
if (stdio) {
err = snd_output_stdio_attach(&out, stdout, 0);
} else {
err = snd_output_stdio_open(&out, nfile, "w");
}
if (err < 0) {
error("Cannot open %s for writing: %s", file, snd_strerror(err));
err = -errno;
goto out;
}
err = snd_config_save(config, out);
snd_output_close(out);
if (err < 0) {
error("snd_config_save: %s", snd_strerror(err));
} else if (nfile) {
err = rename(nfile, file);
if (err < 0)
error("rename failed: %s (%s)", strerror(-err), file);
}
out:
if (!stdio && lock_fd >= 0)
state_unlock(lock_fd, file);
free(nfile);
snd_config_delete(config);
snd_config_update_free_global();
return err;
}
int load_state(const char *cfgdir, const char *file,
const char *initfile, int initflags,
const char *cardname, int do_init)
{
int err, finalerr = 0, open_failed, lock_fd;
struct snd_card_iterator iter;
snd_config_t *config;
const char *cardname1;
config = NULL;
err = load_configuration(file, &config, &open_failed);
if (err < 0 && !open_failed)
return err;
if (open_failed) {
error("Cannot open %s for reading: %s", file, snd_strerror(err));
finalerr = err;
err = snd_card_iterator_sinit(&iter, cardname);
if (err < 0)
return err;
while ((cardname1 = snd_card_iterator_next(&iter)) != NULL) {
if (!do_init)
break;
lock_fd = card_lock(iter.card, LOCK_TIMEOUT);
if (lock_fd < 0) {
finalerr = lock_fd;
initfailed(iter.card, "lock", err);
continue;
}
err = init(cfgdir, initfile, initflags | FLAG_UCM_FBOOT | FLAG_UCM_BOOT, cardname1);
card_unlock(lock_fd, iter.card);
if (err < 0) {
finalerr = err;
initfailed(iter.card, "init", err);
}
initfailed(iter.card, "restore", -ENOENT);
}
err = finalerr;
if (iter.first)
err = 0; /* no cards, no error code */
goto out;
}
err = snd_card_iterator_sinit(&iter, cardname);
if (err < 0)
goto out;
while ((cardname1 = snd_card_iterator_next(&iter)) != NULL) {
lock_fd = card_lock(iter.card, LOCK_TIMEOUT);
if (lock_fd < 0) {
initfailed(iter.card, "lock", lock_fd);
finalerr = lock_fd;
continue;
}
/* error is ignored */
init_ucm(initflags | FLAG_UCM_FBOOT, iter.card);
/* do a check if controls matches state file */
if (do_init && set_controls(iter.card, config, 0)) {
err = init(cfgdir, initfile, initflags | FLAG_UCM_BOOT, cardname1);
if (err < 0) {
initfailed(iter.card, "init", err);
finalerr = err;
}
}
if ((err = set_controls(iter.card, config, 1))) {
if (!force_restore)
finalerr = err;
initfailed(iter.card, "restore", err);
}
card_unlock(lock_fd, iter.card);
}
err = finalerr ? finalerr : snd_card_iterator_error(&iter);
out:
if (config)
snd_config_delete(config);
snd_config_update_free_global();
return err;
}
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