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