mpd_random_playlist/mpd_random_playlist.c

   1 /*
   2  *  mpd_random_playlist.c                                 19.01.2009
   3  *
   4  *  Copyright 2009 Max Christian Pohle <webmaster@coderonline.de>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  19  *  MA 02110-1301, USA.
  20  */
  21 #define PROGRAM_NAME "mpd_random_playlist"
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <libmpd/libmpd.h>
  26 #include <string.h>
  27 #include <time.h>
  28
  29 void help(char *program);
  30 void error_callback(MpdObj *mi,int errorid, char *msg, void *userdata);
  31
  32 int main(int argc, char **argv)
  33 {
  34   int iport  = 6600;
  35   int icount = 50;
  36   int silent = 1;
  37
  38   char *hostname = getenv("MPD_HOST");
  39   char *port     = getenv("MPD_PORT");
  40   char *password = getenv("MPD_PASSWORD");
  41   char *count    = argv[1];
  42
  43
  44   if(!hostname) { hostname = "localhost"; }
  45   if(!password) { password = ""; }
  46   if(count)     { icount = atoi(count); }
  47   if(port)      { iport  = atoi(port); }
  48
  49   if(!silent)
  50     printf("==== " PROGRAM_NAME "====\n\n");
  51   if(icount <= 0)
  52   {
  53     help(PROGRAM_NAME);
  54     exit(0);
  55   }
  56
  57   MpdObj *mo = mpd_new(hostname, iport, password);
  58
  59   if(!mpd_connect(mo))
  60   { mpd_send_password(mo); }
  61
  62   mpd_signal_connect_error(mo, (ErrorCallback)error_callback, NULL);
  63
  64   if(!silent)
  65     printf("STATUS\n");
  66   if (!mpd_check_connected(mo))
  67   {
  68     mpd_free(mo);
  69     printf("\tERROR: failed to connect to %s\n", hostname);
  70     return 1;
  71   }
  72   else
  73   {
  74     if(!silent)
  75       printf("\t> connection to host `%s` estamblished.\n", hostname);
  76   }
  77
  78   MpdData *listItems = mpd_database_get_complete(mo);
  79
  80   int total_songs    = mpd_stats_get_total_songs(mo);
  81   int total_playtime = mpd_stats_get_db_playtime(mo);
  82   if(!silent)
  83   {
  84     printf("\t> found %d songs in database.\n", total_songs);
  85     printf("\t> with a total playtime of %d\n", total_playtime);
  86     printf("\t> random selection of %d files starts now...\n", icount);
  87   }
  88   srand( (unsigned)time( NULL ) );
  89   int i;
  90   for(i=1;i<=icount; i++)
  91   {
  92     float random_song = ((float) rand() / RAND_MAX) * total_songs;
  93     int songNr        = (int) random_song;
  94
  95     int q;
  96     for(q=0; q<=songNr; q++)
  97     {
  98       listItems = mpd_data_get_next(listItems);
  99       if (mpd_data_is_last(listItems))
 100       { listItems = mpd_data_get_first(listItems); }
 101
 102       if(listItems->type != MPD_DATA_TYPE_SONG)
 103       { q--; }
 104     }
 105
 106     if(!silent)
 107       printf("\t\t> adding %s\n", listItems->song->title);
 108     mpd_playlist_queue_add(mo, listItems->song->file);
 109   }
 110   if(!silent)
 111     printf("\t> random selection successfully done.\n");
 112
 113   mpd_playlist_clear(mo);
 114   if(!silent)
 115     printf("\t> cleared playlist.\n");
 116   mpd_playlist_queue_commit(mo);
 117   if(!silent)
 118     printf("\t> submitted new playlist with random songs.\n");
 119   mpd_player_play(mo);
 120   if(!silent)
 121     printf("\t> started playback.\n\n");
 122
 123
 124   mpd_free(mo);
 125   exit(0);
 126 }
 127
 128 void error_callback(MpdObj *mi,int errorid, char *msg, void *userdata)
 129 {
 130   help(PROGRAM_NAME);
 131   printf("ERROR: %s\n...maybe wrong password?", msg);
 132   exit(1);
 133 }
 134
 135 void help(char *program)
 136 {
 137   printf(
 138     "HELP\n"
 139     "\tPROGRAM-CALL\n"
 140     "\t./%s [--help] [<NUMBER_OF_RANDOM_FILES>]\n\n"
 141     "\tENVIROMENT-VARIABLES\n\n"
 142     "\tMPD_HOST\thostname of mpd (optional)\n"
 143     "\tMPD_PORT\tport to connect with mpd (optional)\n"
 144     "\tMPD_PASSWORD\tpassword for the mpd-server (optional, but recommend)\n\n"
 145     "\t...to set these use export <VARIABLE>=<VALUE>-syntax\n\n"
 146     , program
 147   );
 148 }