source: mainline/uspace/app/mixerctl/mixerctl.c

/*
 * Copyright (c) 2011 Jan Vesely
 * All rights reserved.
 *
 * 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.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/** @addtogroup mixerctl
 * @{
 */
/** @file Mixer control for audio devices
 */

#include <assert.h>
#include <errno.h>
#include <loc.h>
#include <str_error.h>
#include <str.h>
#include <audio_mixer_iface.h>
#include <stdio.h>

#define DEFAULT_SERVICE "devices/\\hw\\pci0\\00:01.0\\sb16\\control"

/**
 * Print volume levels on all channels on all control items.
 * @param exch IPC exchange
 */
static void print_levels(async_exch_t *exch)
{
        char *name = NULL;
        unsigned count = 0;
        errno_t ret = audio_mixer_get_info(exch, &name, &count);
        if (ret != EOK) {
                printf("Failed to get mixer info: %s.\n", str_error(ret));
                return;
        }
        printf("MIXER %s:\n\n", name);

        for (unsigned i = 0; i < count; ++i) {
                char *name = NULL;
                unsigned levels = 0, current = 0;
                errno_t ret =
                    audio_mixer_get_item_info(exch, i, &name, &levels);
                if (ret != EOK) {
                        printf("Failed to get item %u info: %s.\n",
                            i, str_error(ret));
                        continue;
                }
                ret = audio_mixer_get_item_level(exch, i, &current);
                if (ret != EOK) {
                        printf("Failed to get item %u info: %s.\n",
                            i, str_error(ret));
                        continue;
                }

                printf("Control item %u `%s' : %u/%u.\n",
                    i, name, current, levels - 1);
                free(name);

        }
}

static unsigned get_number(const char *str)
{
        uint16_t num;
        str_uint16_t(str, NULL, 10, false, &num);
        return num;
}

static void set_level(async_exch_t *exch, int argc, char *argv[])
{
        assert(exch);
        if (argc != 4 && argc != 5) {
                printf("%s [device] setlevel item value\n", argv[0]);
                return;
        }
        unsigned params = argc == 5 ? 3 : 2;
        const unsigned item = get_number(argv[params++]);
        const unsigned value = get_number(argv[params]);
        errno_t ret = audio_mixer_set_item_level(exch, item, value);
        if (ret != EOK) {
                printf("Failed to set item level: %s.\n", str_error(ret));
                return;
        }
        printf("Control item %u new level is %u.\n", item, value);
}

static void get_level(async_exch_t *exch, int argc, char *argv[])
{
        assert(exch);
        if (argc != 3 && argc != 4) {
                printf("%s [device] getlevel item \n", argv[0]);
                return;
        }
        unsigned params = argc == 4 ? 3 : 2;
        const unsigned item = get_number(argv[params++]);
        unsigned value = 0;

        errno_t ret = audio_mixer_get_item_level(exch, item, &value);
        if (ret != EOK) {
                printf("Failed to get item level: %s.\n", str_error(ret));
                return;
        }
        printf("Control item %u level: %u.\n", item, value);
}

int main(int argc, char *argv[])
{
        const char *service = DEFAULT_SERVICE;
        void (*command)(async_exch_t *, int, char *[]) = NULL;

        if (argc >= 2 && str_cmp(argv[1], "setlevel") == 0) {
                command = set_level;
                if (argc == 5)
                        service = argv[1];
        }

        if (argc >= 2 && str_cmp(argv[1], "getlevel") == 0) {
                command = get_level;
                if (argc == 4)
                        service = argv[1];
        }

        if ((argc == 2 && command == NULL))
                service = argv[1];

        service_id_t mixer_sid;
        errno_t rc = loc_service_get_id(service, &mixer_sid, 0);
        if (rc != EOK) {
                printf("Failed to resolve service '%s': %s.\n",
                    service, str_error(rc));
                return 1;
        }

        async_sess_t *session = loc_service_connect(mixer_sid, INTERFACE_DDF, 0);
        if (!session) {
                printf("Failed connecting mixer service '%s'.\n", service);
                return 1;
        }

        async_exch_t *exch = async_exchange_begin(session);
        if (!exch) {
                printf("Failed to start session exchange.\n");
                async_hangup(session);
                return 1;
        }

        if (command) {
                command(exch, argc, argv);
        } else {
                print_levels(exch);
                printf("\n%s:\n", argv[0]);
                printf("Use '%s getlevel idx' command to read individual "
                    "settings\n", argv[0]);
                printf("Use '%s setlevel idx' command to change "
                    "settings\n", argv[0]);
        }

        async_exchange_end(exch);
        async_hangup(session);
        return 0;
}

/** @}
 */