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alsa-utils/alsactl/state.c
Takashi Iwai b0828653c9 alsactl: skip inactive controls 
When using alsactl to save or restore the card settings, it currently
skips over controls that don't have the appropriate read/write
permissions. It should also skip over inactive controls, otherwise it
will get an error when it tries to access that control, and will fail to
save the card state (or fully restore it.)

From: Dave Dillow <dave@thedillows.org>
2007-12-17 11:49:00 +01:00

1596 lines
39 KiB
C
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "aconfig.h"
#include "version.h"
#include <getopt.h>
#include <stdarg.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <alsa/asoundlib.h>
#include "alsactl.h"
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;
}
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_make_integer(&leaf, id);
if (err < 0)
return err;
err = snd_config_add(father, leaf);
if (err < 0) {
snd_config_delete(leaf);
return err;
}
err = snd_config_set_integer(leaf, integer);
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_make_integer64(&leaf, id);
if (err < 0)
return err;
err = snd_config_add(father, leaf);
if (err < 0) {
snd_config_delete(leaf);
return err;
}
err = snd_config_set_integer64(leaf, integer);
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_make_string(&leaf, id);
if (err < 0)
return err;
err = snd_config_add(father, leaf);
if (err < 0) {
snd_config_delete(leaf);
return err;
}
err = snd_config_set_string(leaf, string);
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 int hextodigit(int c)
{
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'a' && c <= 'f')
c = c - 'a' + 10;
else if (c >= 'A' && c <= 'F')
c = c - 'A' + 10;
else
return -1;
return c;
}
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 and dB ranges 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_config_t *comment)
{
unsigned int tlv[MAX_USER_TLV_SIZE];
unsigned int *db;
long dbmin, dbmax;
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);
if (err < 0) {
error("snd_config_string_add: %s", snd_strerror(err));
return err;
}
free(s);
}
}
err = snd_tlv_parse_dB_info(tlv, sizeof(tlv), &db);
if (err <= 0)
return 0;
snd_tlv_get_dB_range(db, snd_ctl_elem_info_get_min(info),
snd_ctl_elem_info_get_max(info),
&dbmin, &dbmax);
if (err < 0)
return err;
snd_config_integer_add(comment, "dbmin", dbmin);
snd_config_integer_add(comment, "dbmax", dbmax);
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, *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_inactive(info) ||
!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_compound_add(control, "comment", 1, &comment);
if (err < 0) {
error("snd_config_compound_add: %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, 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, "%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;
}
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;
}
return 0;
}
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;
}
return 0;
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;
}
return 0;
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;
}
return 0;
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));
return 0;
}
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;
}
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;
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);
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);
if (count < 0) {
err = 0;
goto _close;
}
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_id_t *id;
snd_ctl_elem_id_alloca(&id);
snd_ctl_elem_list_get_id(list, idx, id);
err = get_control(handle, 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:
snd_config_get_integer(n, &i);
return i;
case SND_CONFIG_TYPE_INTEGER64:
snd_config_get_integer64(n, &li);
return li;
case SND_CONFIG_TYPE_STRING:
snd_config_get_string(n, &str);
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)
{
const char *str;
long val;
long long lval;
switch (snd_config_get_type(n)) {
case SND_CONFIG_TYPE_INTEGER:
snd_config_get_integer(n, &val);
if (val < 0 || val > 1)
return -1;
return val;
case SND_CONFIG_TYPE_INTEGER64:
snd_config_get_integer64(n, &lval);
if (lval < 0 || lval > 1)
return -1;
return (int) lval;
case SND_CONFIG_TYPE_STRING:
snd_config_get_string(n, &str);
break;
case SND_CONFIG_TYPE_COMPOUND:
if (!force_restore)
return -1;
n = snd_config_iterator_entry(snd_config_iterator_first(n));
return config_bool(n);
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)
{
const char *str;
long val;
long long lval;
unsigned int idx, items;
switch (snd_config_get_type(n)) {
case SND_CONFIG_TYPE_INTEGER:
snd_config_get_integer(n, &val);
return val;
case SND_CONFIG_TYPE_INTEGER64:
snd_config_get_integer64(n, &lval);
return (int) lval;
case SND_CONFIG_TYPE_STRING:
snd_config_get_string(n, &str);
break;
case SND_CONFIG_TYPE_COMPOUND:
if (!force_restore)
return -1;
n = snd_config_iterator_entry(snd_config_iterator_first(n));
return config_enumerated(n, handle, info);
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 err = snd_config_get_integer(n, val);
if (err < 0 && force_restore) {
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);
}
return err;
}
static int config_integer64(snd_config_t *n, long long *val)
{
int err = snd_config_get_integer64(n, val);
if (err < 0 && force_restore) {
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);
}
return err;
}
static int is_user_control(snd_config_t *conf)
{
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, "user"))
return 1;
}
}
return 0;
}
/*
* get the item type from the given comment config
*/
static int get_comment_type(snd_config_t *n)
{
const char *type;
if (snd_config_get_string(n, &type) < 0)
return -EINVAL;
if (strcmp(type, "BOOLEAN") == 0)
return SND_CTL_ELEM_TYPE_BOOLEAN;
else if (strcmp(type, "INTEGER") == 0)
return SND_CTL_ELEM_TYPE_INTEGER;
else if (strcmp(type, "ENUMERATED") == 0)
return SND_CTL_ELEM_TYPE_ENUMERATED;
else if (strcmp(type, "INTEGER64") == 0)
return SND_CTL_ELEM_TYPE_INTEGER;
else if (strcmp(type, "IEC958") == 0)
return SND_CTL_ELEM_TYPE_IEC958;
else
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;
}
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;
int err;
unsigned int *tlv;
imin = imax = istep = 0;
count = 0;
ctype = SND_CTL_ELEM_TYPE_NONE;
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)
return err;
ctype = err;
continue;
}
if (strcmp(id, "range") == 0) {
err = get_comment_range(n, ctype, &imin, &imax, &istep);
if (err < 0)
return err;
continue;
}
if (strcmp(id, "count") == 0) {
long v;
if ((err = snd_config_get_integer(n, &v)) < 0)
return err;
count = v;
continue;
}
if (strcmp(id, "tlv") == 0) {
const char *s;
if ((err = snd_config_get_string(n, &s)) < 0)
return -EINVAL;
if (tlv)
free(tlv);
if ((tlv = str_to_tlv(s)) == NULL)
return -EINVAL;
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)
return -EINVAL;
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_IEC958:
err = snd_ctl_elem_add_iec958(handle, id);
break;
default:
err = -EINVAL;
break;
}
error:
free(tlv);
if (err < 0)
return err;
return snd_ctl_elem_info(handle, info);
}
/*
* look for a config node with the given item name
*/
static snd_config_t *search_comment_item(snd_config_t *conf, const char *name)
{
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;
if (snd_config_get_id(n, &id) < 0)
continue;
if (strcmp(id, name) == 0)
return n;
}
return NULL;
}
/*
* 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 = search_comment_item(conf, "type");
int ctype;
if (!n)
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,
long ndbmin, long ndbmax)
{
long val;
if (config_integer(value, &val) < 0)
return -EINVAL;
if (val < omin || val > omax)
return -EINVAL;
val = ((val - omin) * (odbmax - odbmin)) / (omax - omin) + odbmin;
if (val < ndbmin)
val = ndbmin;
else if (val > ndbmax)
val = ndbmax;
val = ((val - ndbmin) * (nmax - nmin)) / (ndbmax - ndbmin) + nmin;
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)
{
snd_config_t *n;
long omin, omax, ostep;
long nmin, nmax;
long odbmin, odbmax;
long ndbmin, ndbmax;
snd_ctl_elem_id_t *id;
n = search_comment_item(conf, "range");
if (!n)
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)
return -EINVAL;
}
if (omin >= omax || nmin >= nmax)
return 0; /* invalid values */
n = search_comment_item(conf, "dbmin");
if (!n)
return 0;
if (config_integer(n, &odbmin) < 0)
return 0;
n = search_comment_item(conf, "dbmax");
if (!n)
return 0;
if (config_integer(n, &odbmax) < 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);
convert_to_new_db(n, omin, omax, nmin, nmax,
odbmin, odbmax, ndbmin, ndbmax);
}
} else
convert_to_new_db(value, omin, omax, nmin, nmax,
odbmin, odbmax, ndbmin, ndbmax);
return 0;
}
static int restore_config_value(snd_ctl_t *handle, snd_ctl_elem_info_t *info,
snd_ctl_elem_iface_t type,
snd_config_t *value,
snd_ctl_elem_value_t *ctl, int idx)
{
long val;
long long lval;
int err;
switch (type) {
case SND_CTL_ELEM_TYPE_BOOLEAN:
val = config_bool(value);
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);
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);
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);
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:
error("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_iface_t type,
snd_config_t *value,
snd_ctl_elem_value_t *ctl, int idx,
unsigned int numid)
{
int err = restore_config_value(handle, info, type, value, ctl, idx);
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) {
error("bad control.%d.value.%d content", numid, idx);
return force_restore ? 0 : -EINVAL;
}
snd_ctl_elem_value_set_byte(ctl, idx, val);
return 1;
break;
default:
break;
}
return 0;
}
static int set_control(snd_ctl_t *handle, snd_config_t *control)
{
snd_ctl_elem_value_t *ctl;
snd_ctl_elem_info_t *info;
snd_config_iterator_t i, next;
unsigned int numid1;
snd_ctl_elem_iface_t iface = -1;
int iface1;
const char *name1;
unsigned int numid;
snd_ctl_elem_type_t type;
unsigned int count;
long device = -1;
long device1;
long subdevice = -1;
long subdevice1;
const char *name = NULL;
long index1;
long index = -1;
snd_config_t *value = NULL;
snd_config_t *comment = NULL;
unsigned int idx;
int err;
char *set;
const char *id;
snd_ctl_elem_value_alloca(&ctl);
snd_ctl_elem_info_alloca(&info);
if (snd_config_get_type(control) != SND_CONFIG_TYPE_COMPOUND) {
error("control is not a compound");
return -EINVAL;
}
err = snd_config_get_id(control, &id);
if (err < 0) {
error("unable to get id");
return -EINVAL;
}
numid = atoi(id);
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) {
error("control.%d.%s is invalid", numid, fld);
return -EINVAL;
}
comment = n;
continue;
}
if (strcmp(fld, "iface") == 0) {
iface = (snd_ctl_elem_iface_t)config_iface(n);
if (iface < 0) {
error("control.%d.%s is invalid", numid, fld);
return -EINVAL;
}
continue;
}
if (strcmp(fld, "device") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_INTEGER) {
error("control.%d.%s is invalid", numid, fld);
return -EINVAL;
}
snd_config_get_integer(n, &device);
continue;
}
if (strcmp(fld, "subdevice") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_INTEGER) {
error("control.%d.%s is invalid", numid, fld);
return -EINVAL;
}
snd_config_get_integer(n, &subdevice);
continue;
}
if (strcmp(fld, "name") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_STRING) {
error("control.%d.%s is invalid", numid, fld);
return -EINVAL;
}
snd_config_get_string(n, &name);
continue;
}
if (strcmp(fld, "index") == 0) {
if (snd_config_get_type(n) != SND_CONFIG_TYPE_INTEGER) {
error("control.%d.%s is invalid", numid, fld);
return -EINVAL;
}
snd_config_get_integer(n, &index);
continue;
}
if (strcmp(fld, "value") == 0) {
value = n;
continue;
}
error("unknown control.%d.%s field", numid, fld);
}
if (!value) {
error("missing control.%d.value", numid);
return -EINVAL;
}
if (device < 0)
device = 0;
if (subdevice < 0)
subdevice = 0;
if (index < 0)
index = 0;
err = -EINVAL;
if (! force_restore) {
snd_ctl_elem_info_set_numid(info, numid);
err = snd_ctl_elem_info(handle, info);
}
if (err < 0) {
if (iface >= 0 && name) {
snd_ctl_elem_info_set_numid(info, 0);
snd_ctl_elem_info_set_interface(info, iface);
snd_ctl_elem_info_set_device(info, device);
snd_ctl_elem_info_set_subdevice(info, subdevice);
snd_ctl_elem_info_set_name(info, name);
snd_ctl_elem_info_set_index(info, index);
err = snd_ctl_elem_info(handle, info);
if (err < 0 && comment && is_user_control(comment)) {
err = add_user_control(handle, info, comment);
if (err < 0) {
error("failed to add user control #%d (%s)",
numid, snd_strerror(err));
return err;
}
}
}
}
if (err < 0) {
error("failed to obtain info for control #%d (%s)", numid, snd_strerror(err));
return -ENOENT;
}
numid1 = snd_ctl_elem_info_get_numid(info);
iface1 = snd_ctl_elem_info_get_interface(info);
device1 = snd_ctl_elem_info_get_device(info);
subdevice1 = snd_ctl_elem_info_get_subdevice(info);
name1 = snd_ctl_elem_info_get_name(info);
index1 = snd_ctl_elem_info_get_index(info);
count = snd_ctl_elem_info_get_count(info);
type = snd_ctl_elem_info_get_type(info);
if (err |= numid != numid1 && ! force_restore)
error("warning: numid mismatch (%d/%d) for control #%d",
numid, numid1, numid);
if (err |= iface != iface1)
error("warning: iface mismatch (%d/%d) for control #%d", iface, iface1, numid);
if (err |= device != device1)
error("warning: device mismatch (%ld/%ld) for control #%d", device, device1, numid);
if (err |= subdevice != subdevice1)
error("warning: subdevice mismatch (%ld/%ld) for control #%d", subdevice, subdevice1, numid);
if (err |= strcmp(name, name1))
error("warning: name mismatch (%s/%s) for control #%d", name, name1, numid);
if (err |= index != index1)
error("warning: index mismatch (%ld/%ld) for control #%d", index, index1, numid);
if (err < 0) {
error("failed to obtain info for control #%d (%s)", numid, snd_strerror(err));
return -ENOENT;
}
if (comment) {
if (check_comment_type(comment, type) < 0)
error("incompatible field type for control #%d", numid);
if (type == SND_CTL_ELEM_TYPE_INTEGER) {
if (check_comment_range(handle, comment, info, value) < 0) {
error("value range mismatch for control #%d",
numid);
return -EINVAL;
}
}
}
if (snd_ctl_elem_info_is_inactive(info) ||
!snd_ctl_elem_info_is_writable(info))
return 0;
snd_ctl_elem_value_set_numid(ctl, numid1);
if (count == 1) {
err = restore_config_value(handle, info, type, value, ctl, 0);
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) {
error("bad control.%d.value contents\n", numid);
return -EINVAL;
}
while (*buf) {
int c = *buf++;
if ((c = hextodigit(c)) < 0) {
error("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) {
error("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);
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 < 0 || idx >= count ||
set[idx]) {
error("bad control.%d.value index", numid);
if (!force_restore)
return -EINVAL;
continue;
}
err = restore_config_value2(handle, info, type, n,
ctl, idx, numid);
if (err < 0)
return err;
if (err > 0)
set[idx] = 1;
}
for (idx = 0; idx < count; ++idx) {
if (!set[idx]) {
error("control.%d.value.%d is not specified", numid, idx);
if (!force_restore)
return -EINVAL;
}
}
_ok:
err = snd_ctl_elem_write(handle, ctl);
if (err < 0) {
error("Cannot write control '%d:%ld:%ld:%s:%ld' : %s", (int)iface, device, subdevice, name, index, snd_strerror(err));
return err;
}
return 0;
}
static int set_controls(int card, snd_config_t *top)
{
snd_ctl_t *handle;
snd_ctl_card_info_t *info;
snd_config_t *control;
snd_config_iterator_t i, next;
int err;
char name[32], tmpid[16];
const char *id;
snd_ctl_card_info_alloca(&info);
sprintf(name, "hw:%d", card);
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);
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) {
error("state.%s.control is not a compound\n", id);
return -EINVAL;
}
snd_config_for_each(i, next, control) {
snd_config_t *n = snd_config_iterator_entry(i);
err = set_control(handle, n);
if (err < 0 && ! force_restore)
goto _close;
}
_close:
snd_ctl_close(handle);
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;
err = snd_config_top(&config);
if (err < 0) {
error("snd_config_top error: %s", snd_strerror(err));
return err;
}
stdio = !strcmp(file, "-");
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));
return err;
}
#endif
}
if (!cardname) {
int card, first = 1;
card = -1;
/* find each installed soundcards */
while (1) {
if (snd_card_next(&card) < 0)
break;
if (card < 0) {
if (first) {
error("No soundcards found...");
return -ENODEV;
}
break;
}
first = 0;
if ((err = get_controls(card, config)))
return err;
}
} else {
int cardno;
cardno = snd_card_get_index(cardname);
if (cardno < 0) {
error("Cannot find soundcard '%s'...", cardname);
return cardno;
}
if ((err = get_controls(cardno, config))) {
return err;
}
}
if (stdio)
err = snd_output_stdio_attach(&out, stdout, 0);
else
err = snd_output_stdio_open(&out, file, "w");
if (err < 0) {
error("Cannot open %s for writing: %s", file, snd_strerror(err));
return -errno;
}
err = snd_config_save(config, out);
snd_output_close(out);
if (err < 0)
error("snd_config_save: %s", snd_strerror(err));
return 0;
}
int load_state(const char *file, const char *cardname)
{
int err;
snd_config_t *config;
snd_input_t *in;
int stdio;
err = snd_config_top(&config);
if (err < 0) {
error("snd_config_top error: %s", snd_strerror(err));
return err;
}
stdio = !strcmp(file, "-");
if (stdio)
err = snd_input_stdio_attach(&in, stdin, 0);
else
err = snd_input_stdio_open(&in, file, "r");
if (err >= 0) {
err = snd_config_load(config, in);
snd_input_close(in);
if (err < 0) {
error("snd_config_load error: %s", snd_strerror(err));
return err;
}
} else {
error("Cannot open %s for reading: %s", file, snd_strerror(err));
return err;
}
if (!cardname) {
int card, first = 1;
card = -1;
/* find each installed soundcards */
while (1) {
if (snd_card_next(&card) < 0)
break;
if (card < 0) {
if (first) {
error("No soundcards found...");
return -ENODEV;
}
break;
}
first = 0;
if ((err = set_controls(card, config)) && ! force_restore)
return err;
}
} else {
int cardno;
cardno = snd_card_get_index(cardname);
if (cardno < 0) {
error("Cannot find soundcard '%s'...", cardname);
return -ENODEV;
}
if ((err = set_controls(cardno, config)) && ! force_restore) {
return err;
}
}
return 0;
}
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