130 lines
3.2 KiB
C
130 lines
3.2 KiB
C
/**
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* @brief Control audio mixer knobs
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*
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* @copyright
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* This file is part of ToaruOS and is released under the terms
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* of the NCSA / University of Illinois License - see LICENSE.md
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* Copyright (C) 2015 Mike Gerow
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include <kernel/mod/sound.h>
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static char usage[] =
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"%s - Control audio mixer settings.\n"
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"\n"
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"Usage %s [-d device_id] -l\n"
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" %s [-d device_id] [-k knob_id] -r\n"
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" %s [-d device_id] [-k knob_id] -w knob_value\n"
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" %s -h\n"
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"\n"
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" -d: \033[3mDevice id to address. Defaults to the main sound device.\033[0m\n"
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" -l: \033[3mList the knobs on a device.\033[0m\n"
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" -k: \033[3mKnob id to address. Defaults to the device's master knob.\033[0m\n"
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" -r: \033[3mPerform a read on the given device's knob. Defaults to the device's\n"
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" master knob.\033[0m\n"
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" -w: \033[3mPerform a write on the given device's knob. The value should be a\n"
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" float from 0.0 to 1.0.\033[0m\n"
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" -h: \033[3mPrint this help message and exit.\033[0m\n";
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int main(int argc, char * argv[]) {
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uint32_t device_id = SND_DEVICE_MAIN;
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uint32_t knob_id = SND_KNOB_MASTER;
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uint8_t list_flag = 0;
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uint8_t read_flag = 0;
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uint8_t write_flag = 0;
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double write_value = 0.0;
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int c;
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while ((c = getopt(argc, argv, "d:lk:rw:h?")) != -1) {
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switch (c) {
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case 'd':
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device_id = atoi(optarg);
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break;
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case 'l':
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list_flag = 1;
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break;
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case 'k':
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knob_id = atoi(optarg);
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break;
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case 'r':
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read_flag = 1;
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break;
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case 'w':
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write_flag = 1;
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write_value = atof(optarg);
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if (write_value < 0.0 || write_value > 1.0) {
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fprintf(stderr, "argument -w value must be between 0.0 and 1.0\n");
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exit(EXIT_FAILURE);
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}
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break;
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case 'h':
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case '?':
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default:
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fprintf(stderr, usage, argv[0], argv[0], argv[0], argv[0], argv[0]);
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exit(EXIT_FAILURE);
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}
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}
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int mixer = open("/dev/mixer", O_RDONLY);
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if (mixer < 1) {
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//perror("open");
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exit(EXIT_FAILURE);
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}
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if (list_flag) {
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snd_knob_list_t list = {0};
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list.device = device_id;
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if (ioctl(mixer, SND_MIXER_GET_KNOBS, &list) < 0) {
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perror("ioctl");
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exit(EXIT_FAILURE);
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}
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for (uint32_t i = 0; i < list.num; i++) {
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snd_knob_info_t info = {0};
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info.device = device_id;
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info.id = list.ids[i];
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if (ioctl(mixer, SND_MIXER_GET_KNOB_INFO, &info) < 0) {
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perror("ioctl");
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exit(EXIT_FAILURE);
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}
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fprintf(stdout, "%d: %s\n", (unsigned int)info.id, info.name);
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}
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exit(EXIT_SUCCESS);
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}
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if (read_flag) {
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snd_knob_value_t value = {0};
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value.device = device_id;
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value.id = knob_id;
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if (ioctl(mixer, SND_MIXER_READ_KNOB, &value) < 0) {
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perror("ioctl");
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exit(EXIT_FAILURE);
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}
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double double_val = (double)value.val / SND_KNOB_MAX_VALUE;
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fprintf(stdout, "%f\n", double_val);
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exit(EXIT_FAILURE);
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}
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if (write_flag) {
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snd_knob_value_t value = {0};
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value.device = device_id;
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value.id = knob_id;
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value.val = (uint32_t)(write_value * SND_KNOB_MAX_VALUE);
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if (ioctl(mixer, SND_MIXER_WRITE_KNOB, &value) < 0) {
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perror("ioctl");
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exit(EXIT_FAILURE);
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}
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exit(EXIT_SUCCESS);
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}
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fprintf(stderr, "No operation specified.\n");
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exit(EXIT_FAILURE);
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}
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