tinymix.c

/* 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,
                                   int print_all);
static void tinymix_set_value(struct mixer *mixer, unsigned int id,
                              char *value);
static void tinymix_print_enum(struct mixer_ctl *ctl, int print_all);

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]), 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\t%-40s value\n", "name");
    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%-40s", i, type, num_values, buffer);
        tinymix_detail_control(mixer, i, 0);
    }
}

static void tinymix_print_enum(struct mixer_ctl *ctl, int print_all)
{
    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));
        if (print_all)
            printf("\t%s%s", mixer_ctl_get_value(ctl, 0) == (int)i ? ">" : "",
                   buffer);
        else if (mixer_ctl_get_value(ctl, 0) == (int)i)
            printf(" %-s", buffer);
    }
}

static void tinymix_detail_control(struct mixer *mixer, unsigned int id,
                                   int print_all)
{
    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);

    if (print_all)
        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, print_all);
            break;
        default:
            printf(" unknown");
            break;
        };
    }

    if (print_all) {
        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");
        }
    }
}