/*****************************************************************************
* media_discoverer.c: libvlc media discoverer API sample usage
*****************************************************************************
* Copyright (C) 2024 VLC authors and VideoLAN
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <vlc/vlc.h>
static const char *
category_to_string(libvlc_media_discoverer_category_t cat)
{
switch (cat)
{
case libvlc_media_discoverer_devices: return "devices";
case libvlc_media_discoverer_lan: return "lan";
case libvlc_media_discoverer_podcasts: return "podcasts";
case libvlc_media_discoverer_localdirs: return "localdirs";
default: abort(); /* assert/unreachable */
}
}
static void
print_usage(const char *name, libvlc_instance_t *libvlc)
{
/* Print usage and list all available media discoverer plugins */
fprintf(stderr, "Usage: %s <discoverer_name>\n\n"
"List of discoverers by category:\n", name);
static const libvlc_media_discoverer_category_t cats[] = {
libvlc_media_discoverer_devices,
libvlc_media_discoverer_lan,
libvlc_media_discoverer_podcasts,
libvlc_media_discoverer_localdirs
};
for (size_t i = 0; i < sizeof(cats) / sizeof(cats[0]); ++i)
{
libvlc_media_discoverer_category_t cat = cats[i];
libvlc_media_discoverer_description_t **desclist;
fprintf(stderr, "[%s]:\n", category_to_string(cat));
size_t count = libvlc_media_discoverer_list_get(libvlc, cat, &desclist);
for (size_t j = 0; j < count; j++)
{
libvlc_media_discoverer_description_t *desc = desclist[j];
fprintf(stderr, "\t\"%s\" (%s)\n", desc->psz_name, desc->psz_longname);
}
libvlc_media_discoverer_list_release(desclist, count);
}
}
static void
on_media_added(void *opaque, libvlc_media_t *parent, libvlc_media_t *media)
{
(void) opaque;
char *parentname = parent == NULL ? NULL
: libvlc_media_get_meta(parent, libvlc_meta_Title);
char *mrl = libvlc_media_get_mrl(media);
char *name = libvlc_media_get_meta(media, libvlc_meta_Title);
printf("media_added: \"%s\"\n parent: \"%s\"\n url: \"%s\"\n\n",
name != NULL ? name : "<nil>",
parentname != NULL ? parentname : "<nil>",
mrl != NULL ? mrl : "<nil>");
free(mrl);
free(name);
free(parentname);
}
static void
on_media_removed(void *opaque, libvlc_media_t *media)
{
(void) opaque;
char *mrl = libvlc_media_get_mrl(media);
char *name = libvlc_media_get_meta(media, libvlc_meta_Title);
printf("media_removed: \"%s\"\n url: \"%s\"\n\n",
name != NULL ? name : "<nil>",
mrl != NULL ? mrl : "<nil>");
free(mrl);
free(name);
}
int
main(int argc, const char **argv)
{
static const char* const args[] = {
"--verbose=1",
};
libvlc_instance_t *libvlc = libvlc_new(sizeof args / sizeof *args, args);
if (libvlc == NULL)
return EXIT_FAILURE;
if (argc < 2)
{
print_usage(argv[0], libvlc);
libvlc_release(libvlc);
return EXIT_FAILURE;
}
/* Setup discoverer callbacks */
static const struct libvlc_media_discoverer_cbs cbs = {
.version = 0,
.on_media_added = on_media_added,
.on_media_removed = on_media_removed,
};
libvlc_media_discoverer_t *discoverer =
libvlc_media_discoverer_new(libvlc, argv[1],
&cbs, NULL);
int ret = discoverer == NULL ? -1 : libvlc_media_discoverer_start(discoverer);
if (ret != 0)
{
fprintf(stderr, "Error: unknown discoverer: \"%s\"\n", argv[1]);
print_usage(argv[0], libvlc);
if (discoverer != NULL)
libvlc_media_discoverer_destroy(discoverer);
libvlc_release(libvlc);
return EXIT_FAILURE;
}
printf("Discoverer \"%s\" running, press ENTER to stop\n", argv[1]);
getchar();
libvlc_media_discoverer_stop(discoverer);
libvlc_media_discoverer_destroy(discoverer);
libvlc_release(libvlc);
return EXIT_SUCCESS;
}
¤ Dauer der Verarbeitung: 0.1 Sekunden
(vorverarbeitet am 2026-11-04)
¤
*© Formatika GbR, Deutschland
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