M7350/qcom-opensource/mm-audio/libalsa-intf/amix.c
2024-09-09 08:52:07 +00:00

93 lines
2.1 KiB
C

/*
** Copyright 2010, The Android Open-Source Project
** Copyright (c) 2011, The Linux Foundation. All rights reserved.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdint.h>
#include <string.h>
#include "alsa_audio.h"
struct mixer_ctl *get_ctl(struct mixer *mixer, char *name)
{
char *p;
unsigned idx = 0;
if (isdigit(name[0]))
return mixer_get_nth_control(mixer, atoi(name) - 1);
p = strrchr(name, '#');
if (p) {
*p++ = 0;
idx = atoi(p);
}
return mixer_get_control(mixer, name, idx);
}
int main(int argc, char **argv)
{
struct mixer *mixer;
struct mixer_ctl *ctl;
unsigned value;
int r;
const char* device = "/dev/snd/controlC0";
mixer = mixer_open(device);
if (!mixer){
fprintf(stderr,"oops: %s: %d\n", strerror(errno), __LINE__);
return -1;
}
if (argc == 1) {
mixer_dump(mixer);
mixer_close(mixer);
return 0;
}
ctl = get_ctl(mixer, argv[1]);
argc -= 2;
argv += 2;
if (!ctl) {
fprintf(stderr,"can't find control\n");
mixer_close(mixer);
return -1;
}
if (argc) {
if (isdigit(argv[0][0]))
r = mixer_ctl_set_value(ctl, argc, argv);
else
r = mixer_ctl_select(ctl, argv[0]);
if (r)
fprintf(stderr,"oops: %s: %d\n", strerror(errno), __LINE__);
} else {
mixer_ctl_get(ctl, &value);
}
mixer_close(mixer);
return 0;
}