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cd_shared.c

/*
Copyright (C) 1996-1997 Id Software, Inc.

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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
// Quake is a trademark of Id Software, Inc., (c) 1996 Id Software, Inc. All
// rights reserved.

#include "quakedef.h"
#include "cdaudio.h"
#include "sound.h"

// Prototypes of the system dependent functions
extern void CDAudio_SysEject (void);
extern void CDAudio_SysCloseDoor (void);
extern int CDAudio_SysGetAudioDiskInfo (void);
extern float CDAudio_SysGetVolume (void);
extern void CDAudio_SysSetVolume (float volume);
extern int CDAudio_SysPlay (int track);
extern int CDAudio_SysStop (void);
extern int CDAudio_SysPause (void);
extern int CDAudio_SysResume (void);
extern int CDAudio_SysUpdate (void);
extern void CDAudio_SysInit (void);
extern int CDAudio_SysStartup (void);
extern void CDAudio_SysShutdown (void);

// used by menu to ghost CD audio slider
cvar_t cdaudioinitialized = {CVAR_READONLY,"cdaudioinitialized","0","indicates if CD Audio system is active"};
cvar_t cdaudio = {CVAR_SAVE,"cdaudio","1","CD playing mode (0 = never access CD drive, 1 = play CD tracks if no replacement available, 2 = play fake tracks if no CD track available, 3 = play only real CD tracks, 4 = play real CD tracks even instead of named fake tracks)"};

#define MAX_PLAYLISTS 10
int music_playlist_active = -1;
int music_playlist_playing = 0; // 0 = not playing, 1 = playing, -1 = tried and failed

cvar_t music_playlist_index = {0, "music_playlist_index", "-1", "selects which of the music_playlist_ variables is the active one, -1 disables playlists"};
cvar_t music_playlist_list[MAX_PLAYLISTS] =
{
      {0, "music_playlist_list0", "", "list of tracks to play"},
      {0, "music_playlist_list1", "", "list of tracks to play"},
      {0, "music_playlist_list2", "", "list of tracks to play"},
      {0, "music_playlist_list3", "", "list of tracks to play"},
      {0, "music_playlist_list4", "", "list of tracks to play"},
      {0, "music_playlist_list5", "", "list of tracks to play"},
      {0, "music_playlist_list6", "", "list of tracks to play"},
      {0, "music_playlist_list7", "", "list of tracks to play"},
      {0, "music_playlist_list8", "", "list of tracks to play"},
      {0, "music_playlist_list9", "", "list of tracks to play"}
};
cvar_t music_playlist_current[MAX_PLAYLISTS] =
{
      {0, "music_playlist_current0", "0", "current track index to play in list"},
      {0, "music_playlist_current1", "0", "current track index to play in list"},
      {0, "music_playlist_current2", "0", "current track index to play in list"},
      {0, "music_playlist_current3", "0", "current track index to play in list"},
      {0, "music_playlist_current4", "0", "current track index to play in list"},
      {0, "music_playlist_current5", "0", "current track index to play in list"},
      {0, "music_playlist_current6", "0", "current track index to play in list"},
      {0, "music_playlist_current7", "0", "current track index to play in list"},
      {0, "music_playlist_current8", "0", "current track index to play in list"},
      {0, "music_playlist_current9", "0", "current track index to play in list"},
};
cvar_t music_playlist_random[MAX_PLAYLISTS] =
{
      {0, "music_playlist_random0", "0", "enables random play order if 1, 0 is sequential play"},
      {0, "music_playlist_random1", "0", "enables random play order if 1, 0 is sequential play"},
      {0, "music_playlist_random2", "0", "enables random play order if 1, 0 is sequential play"},
      {0, "music_playlist_random3", "0", "enables random play order if 1, 0 is sequential play"},
      {0, "music_playlist_random4", "0", "enables random play order if 1, 0 is sequential play"},
      {0, "music_playlist_random5", "0", "enables random play order if 1, 0 is sequential play"},
      {0, "music_playlist_random6", "0", "enables random play order if 1, 0 is sequential play"},
      {0, "music_playlist_random7", "0", "enables random play order if 1, 0 is sequential play"},
      {0, "music_playlist_random8", "0", "enables random play order if 1, 0 is sequential play"},
      {0, "music_playlist_random9", "0", "enables random play order if 1, 0 is sequential play"},
};
cvar_t music_playlist_sampleposition[MAX_PLAYLISTS] =
{
      {0, "music_playlist_sampleposition0", "-1", "resume position for track, -1 restarts every time"},
      {0, "music_playlist_sampleposition1", "-1", "resume position for track, -1 restarts every time"},
      {0, "music_playlist_sampleposition2", "-1", "resume position for track, -1 restarts every time"},
      {0, "music_playlist_sampleposition3", "-1", "resume position for track, -1 restarts every time"},
      {0, "music_playlist_sampleposition4", "-1", "resume position for track, -1 restarts every time"},
      {0, "music_playlist_sampleposition5", "-1", "resume position for track, -1 restarts every time"},
      {0, "music_playlist_sampleposition6", "-1", "resume position for track, -1 restarts every time"},
      {0, "music_playlist_sampleposition7", "-1", "resume position for track, -1 restarts every time"},
      {0, "music_playlist_sampleposition8", "-1", "resume position for track, -1 restarts every time"},
      {0, "music_playlist_sampleposition9", "-1", "resume position for track, -1 restarts every time"},
};

static qboolean wasPlaying = false;
static qboolean initialized = false;
static qboolean enabled = false;
static float cdvolume;
typedef char filename_t[MAX_QPATH];
#ifdef MAXTRACKS
static filename_t remap[MAXTRACKS];
#endif
static unsigned char maxTrack;
static int faketrack = -1;

static float saved_vol = 1.0f;

// exported variables
qboolean cdValid = false;
qboolean cdPlaying = false;
qboolean cdPlayLooping = false;
unsigned char cdPlayTrack;

cl_cdstate_t cd;

static void CDAudio_Eject (void)
{
      if (!enabled)
            return;
      
      if(cdaudio.integer == 0)
            return;

      CDAudio_SysEject();
}


static void CDAudio_CloseDoor (void)
{
      if (!enabled)
            return;

      if(cdaudio.integer == 0)
            return;

      CDAudio_SysCloseDoor();
}

static int CDAudio_GetAudioDiskInfo (void)
{
      int ret;

      cdValid = false;

      if(cdaudio.integer == 0)
            return -1;

      ret = CDAudio_SysGetAudioDiskInfo();
      if (ret < 1)
            return -1;

      cdValid = true;
      maxTrack = ret;

      return 0;
}

qboolean CDAudio_Play_real (int track, qboolean looping, qboolean complain)
{
      if(track < 1)
      {
            if(complain)
                  Con_Print("Could not load BGM track.\n");
            return false;
      }

      if (!cdValid)
      {
            CDAudio_GetAudioDiskInfo();
            if (!cdValid)
            {
                  if(complain)
                        Con_DPrint ("No CD in player.\n");
                  return false;
            }
      }

      if (track > maxTrack)
      {
            if(complain)
                  Con_DPrintf("CDAudio: Bad track number %u.\n", track);
            return false;
      }

      if (CDAudio_SysPlay(track) == -1)
            return false;

      if(cdaudio.integer != 3)
            Con_DPrintf ("CD track %u playing...\n", track);

      return true;
}

void CDAudio_Play_byName (const char *trackname, qboolean looping, qboolean tryreal, float startposition)
{
      unsigned int track;
      sfx_t* sfx;
      char filename[MAX_QPATH];

      Host_StartVideo();

      if (!enabled)
            return;

      if(tryreal && strspn(trackname, "0123456789") == strlen(trackname))
      {
            track = (unsigned char) atoi(trackname);
#ifdef MAXTRACKS
            if(track > 0 && track < MAXTRACKS)
                  if(*remap[track])
                  {
                        if(strspn(remap[track], "0123456789") == strlen(remap[track]))
                        {
                              trackname = remap[track];
                        }
                        else
                        {
                              // ignore remappings to fake tracks if we're going to play a real track
                              switch(cdaudio.integer)
                              {
                                    case 0: // we never access CD
                                    case 1: // we have a replacement
                                          trackname = remap[track];
                                          break;
                                    case 2: // we only use fake track replacement if CD track is invalid
                                          CDAudio_GetAudioDiskInfo();
                                          if(!cdValid || track > maxTrack)
                                                trackname = remap[track];
                                          break;
                                    case 3: // we always play from CD - ignore this remapping then
                                    case 4: // we randomize anyway
                                          break;
                              }
                        }
                  }
#endif
      }

      if(tryreal && strspn(trackname, "0123456789") == strlen(trackname))
      {
            track = (unsigned char) atoi(trackname);
            if (track < 1)
            {
                  Con_DPrintf("CDAudio: Bad track number %u.\n", track);
                  return;
            }
      }
      else
            track = 0;

      // div0: I assume this code was intentionally there. Maybe turn it into a cvar?
      if (cdPlaying && cdPlayTrack == track && faketrack == -1)
            return;
      CDAudio_Stop ();

      if(track >= 1)
      {
            if(cdaudio.integer == 3) // only play real CD tracks at all
            {
                  if(CDAudio_Play_real(track, looping, true))
                        goto success;
                  return;
            }

            if(cdaudio.integer == 2) // prefer real CD track over fake
            {
                  if(CDAudio_Play_real(track, looping, false))
                        goto success;
            }
      }

      if(cdaudio.integer == 4) // only play real CD tracks, EVEN instead of fake tracks!
      {
            if(CDAudio_Play_real(track, looping, false))
                  goto success;
            
            if(cdValid && maxTrack > 0)
            {
                  track = 1 + (rand() % maxTrack);
                  if(CDAudio_Play_real(track, looping, true))
                        goto success;
            }
            else
            {
                  Con_DPrint ("No CD in player.\n");
            }
            return;
      }

      // Try playing a fake track (sound file) first
      if(track >= 1)
      {
                                          dpsnprintf(filename, sizeof(filename), "sound/cdtracks/track%03u.wav", track);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "sound/cdtracks/track%03u.ogg", track);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "music/track%03u.ogg", track);// added by motorsep
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "music/cdtracks/track%03u.ogg", track);// added by motorsep
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "sound/cdtracks/track%02u.wav", track);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "sound/cdtracks/track%02u.ogg", track);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "music/track%02u.ogg", track);// added by motorsep
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "music/cdtracks/track%02u.ogg", track);// added by motorsep
      }
      else
      {
                                          dpsnprintf(filename, sizeof(filename), "%s", trackname);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "%s.wav", trackname);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "%s.ogg", trackname);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "sound/%s", trackname);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "sound/%s.wav", trackname);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "sound/%s.ogg", trackname);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "sound/cdtracks/%s", trackname);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "sound/cdtracks/%s.wav", trackname);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "sound/cdtracks/%s.ogg", trackname);
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "music/%s.ogg", trackname); // added by motorsep
            if (!FS_FileExists(filename)) dpsnprintf(filename, sizeof(filename), "music/cdtracks/%s.ogg", trackname); // added by motorsep
      }
      if (FS_FileExists(filename) && (sfx = S_PrecacheSound (filename, false, false)))
      {
            faketrack = S_StartSound_StartPosition_Flags (-1, 0, sfx, vec3_origin, cdvolume, 0, startposition, (looping ? CHANNELFLAG_FORCELOOP : 0) | CHANNELFLAG_FULLVOLUME | CHANNELFLAG_LOCALSOUND);
            if (faketrack != -1)
            {
                  if(track >= 1)
                  {
                        if(cdaudio.integer != 0) // we don't need these messages if only fake tracks can be played anyway
                              Con_DPrintf ("Fake CD track %u playing...\n", track);
                  }
                  else
                        Con_DPrintf ("BGM track %s playing...\n", trackname);
            }
      }

      // If we can't play a fake CD track, try the real one
      if (faketrack == -1)
      {
            if(cdaudio.integer == 0 || track < 1)
            {
                  Con_Print("Could not load BGM track.\n");
                  return;
            }
            else
            {
                  if(!CDAudio_Play_real(track, looping, true))
                        return;
            }
      }

success:
      cdPlayLooping = looping;
      cdPlayTrack = track;
      cdPlaying = true;

      if (cdvolume == 0.0 || bgmvolume.value == 0)
            CDAudio_Pause ();
}

void CDAudio_Play (int track, qboolean looping)
{
      char buf[20];
      if (music_playlist_index.integer >= 0)
            return;
      dpsnprintf(buf, sizeof(buf), "%d", (int) track);
      CDAudio_Play_byName(buf, looping, true, 0);
}

float CDAudio_GetPosition (void)
{
      if(faketrack != -1)
            return S_GetChannelPosition(faketrack);
      return -1;
}

static void CDAudio_StopPlaylistTrack(void);

void CDAudio_Stop (void)
{
      if (!enabled)
            return;

      // save the playlist position
      CDAudio_StopPlaylistTrack();

      if (faketrack != -1)
      {
            S_StopChannel (faketrack, true, true);
            faketrack = -1;
      }
      else if (cdPlaying && (CDAudio_SysStop() == -1))
            return;
      else if(wasPlaying)
      {
            CDAudio_Resume(); // needed by SDL - can't stop while paused there (causing pause/stop to fail after play, pause, stop, play otherwise)
            if (cdPlaying && (CDAudio_SysStop() == -1))
                  return;
      }

      wasPlaying = false;
      cdPlaying = false;
}

void CDAudio_Pause (void)
{
      if (!enabled || !cdPlaying)
            return;

      if (faketrack != -1)
            S_SetChannelFlag (faketrack, CHANNELFLAG_PAUSED, true);
      else if (CDAudio_SysPause() == -1)
            return;

      wasPlaying = cdPlaying;
      cdPlaying = false;
}


void CDAudio_Resume (void)
{
      if (!enabled || cdPlaying || !wasPlaying)
            return;

      if (faketrack != -1)
            S_SetChannelFlag (faketrack, CHANNELFLAG_PAUSED, false);
      else if (CDAudio_SysResume() == -1)
            return;
      cdPlaying = true;
}

static void CD_f (void)
{
      const char *command;
#ifdef MAXTRACKS
      int ret;
      int n;
#endif

      command = Cmd_Argv (1);

      if (strcasecmp(command, "remap") != 0)
            Host_StartVideo();

      if (strcasecmp(command, "on") == 0)
      {
            enabled = true;
            return;
      }

      if (strcasecmp(command, "off") == 0)
      {
            CDAudio_Stop();
            enabled = false;
            return;
      }

      if (strcasecmp(command, "reset") == 0)
      {
            enabled = true;
            CDAudio_Stop();
#ifdef MAXTRACKS
            for (n = 0; n < MAXTRACKS; n++)
                  *remap[n] = 0; // empty string, that is, unremapped
#endif
            CDAudio_GetAudioDiskInfo();
            return;
      }

      if (strcasecmp(command, "rescan") == 0)
      {
            CDAudio_Shutdown();
            CDAudio_Startup();
            return;
      }

      if (strcasecmp(command, "remap") == 0)
      {
#ifdef MAXTRACKS
            ret = Cmd_Argc() - 2;
            if (ret <= 0)
            {
                  for (n = 1; n < MAXTRACKS; n++)
                        if (*remap[n])
                              Con_Printf("  %u -> %s\n", n, remap[n]);
                  return;
            }
            for (n = 1; n <= ret; n++)
                  strlcpy(remap[n], Cmd_Argv (n+1), sizeof(*remap));
#endif
            return;
      }

      if (strcasecmp(command, "close") == 0)
      {
            CDAudio_CloseDoor();
            return;
      }

      if (strcasecmp(command, "play") == 0)
      {
            if (music_playlist_index.integer >= 0)
                  return;
            CDAudio_Play_byName(Cmd_Argv (2), false, true, (Cmd_Argc() > 3) ? atof( Cmd_Argv(3) ) : 0);
            return;
      }

      if (strcasecmp(command, "loop") == 0)
      {
            if (music_playlist_index.integer >= 0)
                  return;
            CDAudio_Play_byName(Cmd_Argv (2), true, true, (Cmd_Argc() > 3) ? atof( Cmd_Argv(3) ) : 0);
            return;
      }

      if (strcasecmp(command, "stop") == 0)
      {
            if (music_playlist_index.integer >= 0)
                  return;
            CDAudio_Stop();
            return;
      }

      if (strcasecmp(command, "pause") == 0)
      {
            if (music_playlist_index.integer >= 0)
                  return;
            CDAudio_Pause();
            return;
      }

      if (strcasecmp(command, "resume") == 0)
      {
            if (music_playlist_index.integer >= 0)
                  return;
            CDAudio_Resume();
            return;
      }

      if (strcasecmp(command, "eject") == 0)
      {
            if (faketrack == -1)
                  CDAudio_Stop();
            CDAudio_Eject();
            cdValid = false;
            return;
      }

      if (strcasecmp(command, "info") == 0)
      {
            CDAudio_GetAudioDiskInfo ();
            if (cdValid)
                  Con_Printf("%u tracks on CD.\n", maxTrack);
            else
                  Con_Print ("No CD in player.\n");
            if (cdPlaying)
                  Con_Printf("Currently %s track %u\n", cdPlayLooping ? "looping" : "playing", cdPlayTrack);
            else if (wasPlaying)
                  Con_Printf("Paused %s track %u\n", cdPlayLooping ? "looping" : "playing", cdPlayTrack);
            if (cdvolume >= 0)
                  Con_Printf("Volume is %f\n", cdvolume);
            else
                  Con_Printf("Can't get CD volume\n");
            return;
      }

      Con_Printf("CD commands:\n");
      Con_Printf("cd on - enables CD audio system\n");
      Con_Printf("cd off - stops and disables CD audio system\n");
      Con_Printf("cd reset - resets CD audio system (clears track remapping and re-reads disc information)\n");
      Con_Printf("cd rescan - rescans disks in drives (to use another disc)\n");
      Con_Printf("cd remap <remap1> [remap2] [remap3] [...] - chooses (possibly emulated) CD tracks to play when a map asks for a particular track, this has many uses\n");
      Con_Printf("cd close - closes CD tray\n");
      Con_Printf("cd eject - stops playing music and opens CD tray to allow you to change disc\n");
      Con_Printf("cd play <tracknumber> <startposition> - plays selected track in remapping table\n");
      Con_Printf("cd loop <tracknumber> <startposition> - plays and repeats selected track in remapping table\n");
      Con_Printf("cd stop - stops playing current CD track\n");
      Con_Printf("cd pause - pauses CD playback\n");
      Con_Printf("cd resume - unpauses CD playback\n");
      Con_Printf("cd info - prints basic disc information (number of tracks, currently playing track, volume level)\n");
}

void CDAudio_SetVolume (float newvol)
{
      // If the volume hasn't changed
      if (newvol == cdvolume)
            return;

      // If the CD has been muted
      if (newvol == 0.0f)
            CDAudio_Pause ();
      else
      {
            // If the CD has been unmuted
            if (cdvolume == 0.0f)
                  CDAudio_Resume ();

            if (faketrack != -1)
                  S_SetChannelVolume (faketrack, newvol);
            else
                  CDAudio_SysSetVolume (newvol * mastervolume.value);
      }

      cdvolume = newvol;
}

static void CDAudio_StopPlaylistTrack(void)
{
      if (music_playlist_active >= 0 && music_playlist_active < MAX_PLAYLISTS && music_playlist_sampleposition[music_playlist_active].value >= 0)
      {
            // save position for resume
            float position = CDAudio_GetPosition();
            Cvar_SetValueQuick(&music_playlist_sampleposition[music_playlist_active], position >= 0 ? position : 0);
      }
      music_playlist_active = -1;
      music_playlist_playing = 0; // not playing
}

void CDAudio_StartPlaylist(qboolean resume)
{
      const char *list;
      const char *t;
      int index;
      int current;
      int randomplay;
      int count;
      int listindex;
      float position;
      char trackname[MAX_QPATH];
      CDAudio_Stop();
      index = music_playlist_index.integer;
      if (index >= 0 && index < MAX_PLAYLISTS && bgmvolume.value > 0)
      {
            list = music_playlist_list[index].string;
            current = music_playlist_current[index].integer;
            randomplay = music_playlist_random[index].integer;
            position = music_playlist_sampleposition[index].value;
            count = 0;
            trackname[0] = 0;
            if (list && list[0])
            {
                  for (t = list;;count++)
                  {
                        if (!COM_ParseToken_Console(&t))
                              break;
                        // if we don't find the desired track, use the first one
                        if (count == 0)
                              strlcpy(trackname, com_token, sizeof(trackname));
                  }
            }
            if (count > 0)
            {
                  // position < 0 means never resume track
                  if (position < 0)
                        position = 0;
                  // advance to next track in playlist if the last one ended
                  if (!resume)
                  {
                        position = 0;
                        current++;
                        if (randomplay)
                              current = (int)lhrandom(0, count);
                  }
                  // wrap playlist position if needed
                  if (current >= count)
                        current = 0;
                  // set current
                  Cvar_SetValueQuick(&music_playlist_current[index], current);
                  // get the Nth trackname
                  if (current >= 0 && current < count)
                  {
                        for (listindex = 0, t = list;;listindex++)
                        {
                              if (!COM_ParseToken_Console(&t))
                                    break;
                              if (listindex == current)
                              {
                                    strlcpy(trackname, com_token, sizeof(trackname));
                                    break;
                              }
                        }
                  }
                  if (trackname[0])
                  {
                        CDAudio_Play_byName(trackname, false, false, position);
                        if (faketrack != -1)
                              music_playlist_active = index;
                  }
            }
      }
      music_playlist_playing = music_playlist_active >= 0 ? 1 : -1;
}

void CDAudio_Update (void)
{
      static int lastplaylist = -1;
      if (!enabled)
            return;

      CDAudio_SetVolume (bgmvolume.value);
      if (music_playlist_playing > 0 && CDAudio_GetPosition() < 0)
      {
            // this track ended, start a new track from the beginning
            CDAudio_StartPlaylist(false);
            lastplaylist = music_playlist_index.integer;
      }
      else if (lastplaylist != music_playlist_index.integer
      || (bgmvolume.value > 0 && !music_playlist_playing && music_playlist_index.integer >= 0))
      {
            // active playlist changed, save position and switch track
            CDAudio_StartPlaylist(true);
            lastplaylist = music_playlist_index.integer;
      }

      if (faketrack == -1 && cdaudio.integer != 0 && bgmvolume.value != 0)
            CDAudio_SysUpdate();
}

int CDAudio_Init (void)
{
      int i;

      if (cls.state == ca_dedicated)
            return -1;

// COMMANDLINEOPTION: Sound: -nocdaudio disables CD audio support
      if (COM_CheckParm("-nocdaudio"))
            return -1;

      CDAudio_SysInit();

#ifdef MAXTRACKS
      for (i = 0; i < MAXTRACKS; i++)
            *remap[i] = 0;
#endif

      Cvar_RegisterVariable(&cdaudio);
      Cvar_RegisterVariable(&cdaudioinitialized);
      Cvar_SetValueQuick(&cdaudioinitialized, true);
      enabled = true;

      Cvar_RegisterVariable(&music_playlist_index);
      for (i = 0;i < MAX_PLAYLISTS;i++)
      {
            Cvar_RegisterVariable(&music_playlist_list[i]);
            Cvar_RegisterVariable(&music_playlist_current[i]);
            Cvar_RegisterVariable(&music_playlist_random[i]);
            Cvar_RegisterVariable(&music_playlist_sampleposition[i]);
      }

      Cmd_AddCommand("cd", CD_f, "execute a CD drive command (cd on/off/reset/remap/close/play/loop/stop/pause/resume/eject/info) - use cd by itself for usage");

      return 0;
}

int CDAudio_Startup (void)
{
      if (COM_CheckParm("-nocdaudio"))
            return -1;

      CDAudio_SysStartup ();

      if (CDAudio_GetAudioDiskInfo())
      {
            Con_Print("CDAudio_Init: No CD in player.\n");
            cdValid = false;
      }

      saved_vol = CDAudio_SysGetVolume ();
      if (saved_vol < 0.0f)
      {
            Con_Print ("Can't get initial CD volume\n");
            saved_vol = 1.0f;
      }
      else
            Con_Printf ("Initial CD volume: %g\n", saved_vol);

      initialized = true;

      Con_Print("CD Audio Initialized\n");

      return 0;
}

void CDAudio_Shutdown (void)
{
      if (!initialized)
            return;

      CDAudio_SysSetVolume (saved_vol);

      CDAudio_Stop();
      CDAudio_SysShutdown();
      initialized = false;
}

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