From Music Player Daemon Community Wiki
/*
* mpd_random_playlist.c 19.01.2009
*
* Copyright 2009 Max Christian Pohle <webmaster@coderonline.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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.
*/
#define PROGRAM_NAME "mpd_random_playlist"
#include <stdio.h>
#include <stdlib.h>
#include <libmpd/libmpd.h>
#include <string.h>
#include <time.h>
void help(char *program);
void error_callback(MpdObj *mi,int errorid, char *msg, void *userdata);
int main(int argc, char **argv)
{
int iport = 6600;
int icount = 50;
int silent = 1;
char *hostname = getenv("MPD_HOST");
char *port = getenv("MPD_PORT");
char *password = getenv("MPD_PASSWORD");
char *count = argv[1];
if(!hostname) { hostname = "localhost"; }
if(!password) { password = ""; }
if(count) { icount = atoi(count); }
if(port) { iport = atoi(port); }
if(!silent)
printf("==== " PROGRAM_NAME "====\n\n");
if(icount <= 0)
{
help(PROGRAM_NAME);
exit(0);
}
MpdObj *mo = mpd_new(hostname, iport, password);
if(!mpd_connect(mo))
{ mpd_send_password(mo); }
mpd_signal_connect_error(mo, (ErrorCallback)error_callback, NULL);
if(!silent)
printf("STATUS\n");
if (!mpd_check_connected(mo))
{
mpd_free(mo);
printf("\tERROR: failed to connect to %s\n", hostname);
return 1;
}
else
{
if(!silent)
printf("\t> connection to host `%s` estamblished.\n", hostname);
}
MpdData *listItems = mpd_database_get_complete(mo);
int total_songs = mpd_stats_get_total_songs(mo);
int total_playtime = mpd_stats_get_db_playtime(mo);
if(!silent)
{
printf("\t> found %d songs in database.\n", total_songs);
printf("\t> with a total playtime of %d\n", total_playtime);
printf("\t> random selection of %d files starts now...\n", icount);
}
srand( (unsigned)time( NULL ) );
int i;
for(i=1;i<=icount; i++)
{
float random_song = ((float) rand() / RAND_MAX) * total_songs;
int songNr = (int) random_song;
int q;
for(q=0; q<=songNr; q++)
{
listItems = mpd_data_get_next(listItems);
if (mpd_data_is_last(listItems))
{ listItems = mpd_data_get_first(listItems); }
if(listItems->type != MPD_DATA_TYPE_SONG)
{ q--; }
}
if(!silent)
printf("\t\t> adding %s\n", listItems->song->title);
mpd_playlist_queue_add(mo, listItems->song->file);
}
if(!silent)
printf("\t> random selection successfully done.\n");
mpd_playlist_clear(mo);
if(!silent)
printf("\t> cleared playlist.\n");
mpd_playlist_queue_commit(mo);
if(!silent)
printf("\t> submitted new playlist with random songs.\n");
mpd_player_play(mo);
if(!silent)
printf("\t> started playback.\n\n");
mpd_free(mo);
exit(0);
}
void error_callback(MpdObj *mi,int errorid, char *msg, void *userdata)
{
help(PROGRAM_NAME);
printf("ERROR: %s\n...maybe wrong password?", msg);
exit(1);
}
void help(char *program)
{
printf(
"HELP\n"
"\tPROGRAM-CALL\n"
"\t./%s [--help] [<NUMBER_OF_RANDOM_FILES>]\n\n"
"\tENVIROMENT-VARIABLES\n\n"
"\tMPD_HOST\thostname of mpd (optional)\n"
"\tMPD_PORT\tport to connect with mpd (optional)\n"
"\tMPD_PASSWORD\tpassword for the mpd-server (optional, but recommend)\n\n"
"\t...to set these use export <VARIABLE>=<VALUE>-syntax\n\n"
, program
);
}
