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/* tinymix.c
**
** Copyright 2011, The Android Open Source Project
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** * Neither the name of The Android Open Source Project nor the names of
** its contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY The Android Open Source Project ``AS IS'' AND
** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
** ARE DISCLAIMED. IN NO EVENT SHALL The Android Open Source Project BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
** DAMAGE.
*/
#include <tinyalsa/asoundlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
static void tinymix_list_controls(struct mixer *mixer);
static void tinymix_detail_control(struct mixer *mixer, unsigned int id);
static void tinymix_set_value(struct mixer *mixer, unsigned int id,
char *value);
int main(int argc, char **argv)
{
struct mixer *mixer;
mixer = mixer_open(0);
if (!mixer) {
fprintf(stderr, "Failed to open mixer\n");
return EXIT_FAILURE;
}
if (argc == 1)
tinymix_list_controls(mixer);
else if (argc == 2)
tinymix_detail_control(mixer, atoi(argv[1]));
else if (argc == 3)
tinymix_set_value(mixer, atoi(argv[1]), argv[2]);
else
printf("Usage: tinymix [control id] [value to set]\n");
mixer_close(mixer);
return 0;
}
static void tinymix_list_controls(struct mixer *mixer)
{
struct mixer_ctl *ctl;
const char *type;
unsigned int num_ctls, num_values;
char buffer[256];
unsigned int i;
num_ctls = mixer_get_num_ctls(mixer);
printf("Number of controls: %d\n", num_ctls);
printf("ctl\ttype\tnum\tname\n");
for (i = 0; i < num_ctls; i++) {
ctl = mixer_get_ctl(mixer, i);
mixer_ctl_get_name(ctl, buffer, sizeof(buffer));
type = mixer_ctl_get_type_string(ctl);
num_values = mixer_ctl_get_num_values(ctl);
printf("%d\t%s\t%d\t%s\n", i, type, num_values, buffer);
}
}
static void tinymix_print_enum(struct mixer_ctl *ctl)
{
unsigned int num_enums;
char buffer[256];
unsigned int i;
num_enums = mixer_ctl_get_num_enums(ctl);
for (i = 0; i < num_enums; i++) {
mixer_ctl_get_enum_string(ctl, i, buffer, sizeof(buffer));
printf("\t%s%s", mixer_ctl_get_value(ctl, 0) == (int)i ? ">" : "",
buffer);
}
}
static void tinymix_detail_control(struct mixer *mixer, unsigned int id)
{
struct mixer_ctl *ctl;
enum mixer_ctl_type type;
unsigned int num_values;
char buffer[256];
unsigned int i;
int min, max;
if (id >= mixer_get_num_ctls(mixer)) {
fprintf(stderr, "Invalid mixer control\n");
return;
}
ctl = mixer_get_ctl(mixer, id);
mixer_ctl_get_name(ctl, buffer, sizeof(buffer));
type = mixer_ctl_get_type(ctl);
num_values = mixer_ctl_get_num_values(ctl);
printf("%s:", buffer);
for (i = 0; i < num_values; i++) {
switch (type)
{
case MIXER_CTL_TYPE_INT:
printf(" %d", mixer_ctl_get_value(ctl, i));
break;
case MIXER_CTL_TYPE_BOOL:
printf(" %s", mixer_ctl_get_value(ctl, i) ? "On" : "Off");
break;
case MIXER_CTL_TYPE_ENUM:
tinymix_print_enum(ctl);
break;
default:
printf(" unknown");
break;
};
}
if (type == MIXER_CTL_TYPE_INT) {
min = mixer_ctl_get_range_min(ctl);
max = mixer_ctl_get_range_max(ctl);
printf(" (range %d->%d)", min, max);
}
printf("\n");
}
static void tinymix_set_value(struct mixer *mixer, unsigned int id,
char *string)
{
struct mixer_ctl *ctl;
enum mixer_ctl_type type;
unsigned int num_values;
unsigned int i;
ctl = mixer_get_ctl(mixer, id);
type = mixer_ctl_get_type(ctl);
num_values = mixer_ctl_get_num_values(ctl);
if (isdigit(string[0])) {
int value = atoi(string);
for (i = 0; i < num_values; i++) {
if (mixer_ctl_set_value(ctl, i, value)) {
fprintf(stderr, "Error: invalid value\n");
return;
}
}
} else {
if (type == MIXER_CTL_TYPE_ENUM) {
if (mixer_ctl_set_enum_by_string(ctl, string))
fprintf(stderr, "Error: invalid enum value\n");
} else {
fprintf(stderr, "Error: only enum types can be set with strings\n");
}
}
}
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