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Add a command line utility for interacting with /dev/mixer

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This commit is contained in:
Mike Gerow 2015-05-17 20:30:06 -07:00
parent 0f35a5bfe3
commit 368d2c0525
1 changed files with 123 additions and 0 deletions
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userspace/extra/mixerctl.c Normal file
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/* vim: tabstop=4 shiftwidth=4 noexpandtab
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2015 Mike Gerow
*/
#include <fcntl.h>
#include <lib/sound.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
static const char usage[] =
"Usage %s [-d device_id] -l\n"
" %s [-d device_id] [-k knob_id] -r\n"
" %s [-d device_id] [-k knob_id] -w knob_value\n"
" %s -h\n"
" -d: Device id to address. Defaults to the main sound device.\n"
" -l: List the knobs on a device.\n"
" -k: Knob id to address. Defaults to the device's master knob.\n"
" -r: Perform a read on the given device's knob. Defaults to the device's\n"
" master knob.\n"
" -w: Perform a write on the given device's knob. The value should be a\n"
" float from 0.0 to 1.0.\n"
" -h: Print this help message and exit.\n";
int main(int argc, char * argv[]) {
uint32_t device_id = SND_DEVICE_MAIN;
uint32_t knob_id = SND_KNOB_MASTER;
uint8_t list_flag = 0;
uint8_t read_flag = 0;
uint8_t write_flag = 0;
double write_value = 0.0;
int c;
while ((c = getopt(argc, argv, "d:lk:rw:h")) != -1) {
switch (c) {
case 'd':
device_id = atol(optarg);
break;
case 'l':
list_flag = 1;
break;
case 'k':
knob_id = atol(optarg);
break;
case 'r':
read_flag = 1;
break;
case 'w':
write_flag = 1;
write_value = atof(optarg);
if (write_value < 0.0 || write_value > 1.0) {
fprintf(stderr, "argument -w value must be between 0.0 and 1.0\n");
exit(EXIT_FAILURE);
}
break;
case 'h':
fprintf(stdout, usage, argv[0], argv[0], argv[0], argv[0]);
exit(EXIT_SUCCESS);
default:
fprintf(stderr, usage, argv[0], argv[0], argv[0], argv[0]);
exit(EXIT_FAILURE);
}
}
int mixer = open("/dev/mixer", O_RDONLY);
if (mixer < 1) {
perror("open");
exit(EXIT_FAILURE);
}
if (list_flag) {
snd_knob_list_t list = {0};
list.device = device_id;
if (ioctl(mixer, SND_MIXER_GET_KNOBS, &list) < 0) {
perror("ioctl");
exit(EXIT_FAILURE);
}
for (uint32_t i = 0; i < list.num; i++) {
snd_knob_info_t info = {0};
info.device = device_id;
info.id = list.ids[i];
if (ioctl(mixer, SND_MIXER_GET_KNOB_INFO, &info) < 0) {
perror("ioctl");
exit(EXIT_FAILURE);
}
fprintf(stdout, "%d: %s\n", info.id, info.name);
}
exit(EXIT_SUCCESS);
}
if (read_flag) {
snd_knob_value_t value = {0};
value.device = device_id;
value.id = knob_id;
if (ioctl(mixer, SND_MIXER_READ_KNOB, &value) < 0) {
perror("ioctl");
exit(EXIT_FAILURE);
}
double double_val = (double)value.val / SND_KNOB_MAX_VALUE;
fprintf(stdout, "%f\n", double_val);
exit(EXIT_FAILURE);
}
if (write_flag) {
snd_knob_value_t value = {0};
value.device = device_id;
value.id = knob_id;
value.val = (uint32_t)(write_value * SND_KNOB_MAX_VALUE);
if (ioctl(mixer, SND_MIXER_WRITE_KNOB, &value) < 0) {
perror("ioctl");
exit(EXIT_FAILURE);
}
exit(EXIT_SUCCESS);
}
fprintf(stderr, "No operation specified.\n");
exit(EXIT_FAILURE);
}