/*

     SDL_mixer:  An audio mixer library based on the SDL library

     Copyright (C) 1997-2009 Sam Lantinga

     This library is free software; you can redistribute it and/or

     modify it under the terms of the GNU Library General Public

     License as published by the Free Software Foundation; either

     version 2 of the License, or (at your option) any later version.

     This library 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

     Library General Public License for more details.

     You should have received a copy of the GNU Library General Public

     License along with this library; if not, write to the Free

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

     Sam Lantinga

     slouken@libsdl.org

 */

 /* $Id$ */

 #include <stdlib.h>

 #include <string.h>

 #include <ctype.h>

 #include <assert.h>

 #include "SDL_endian.h"

 #include "SDL_audio.h"

 #include "SDL_timer.h"

 #include "SDL_mixer.h"

 /* The music command hack is UNIX specific */

 #ifndef unix

 #undef CMD_MUSIC

 #endif

 #ifdef CMD_MUSIC

 #include "music_cmd.h"

 #endif

 #ifdef WAV_MUSIC

 #include "wavestream.h"

 #endif

 #ifdef MOD_MUSIC

 #include "music_mod.h"

 #endif

 #ifdef MID_MUSIC

 #  ifdef USE_TIMIDITY_MIDI

 #    include "timidity.h"

 #  endif

 #  ifdef USE_NATIVE_MIDI

 #    include "native_midi.h"

 #  endif

 #  if defined(USE_TIMIDITY_MIDI) && defined(USE_NATIVE_MIDI)

 #    define MIDI_ELSE	else

 #  else

 #    define MIDI_ELSE

 #  endif

 #endif

 #ifdef OGG_MUSIC

 #include "music_ogg.h"

 #endif

 #ifdef MP3_MUSIC

 #include "dynamic_mp3.h"

 #endif

 #ifdef MP3_MAD_MUSIC

 #include "music_mad.h"

 #endif

 #ifdef FLAC_MUSIC

 #include "music_flac.h"

 #endif

 #if defined(MP3_MUSIC) || defined(MP3_MAD_MUSIC)

 static SDL_AudioSpec used_mixer;

 #endif

 int volatile music_active = 1;

 static int volatile music_stopped = 0;

 static int music_loops = 0;

 static char *music_cmd = NULL;

 static Mix_Music * volatile music_playing = NULL;

 static int music_volume = MIX_MAX_VOLUME;

 struct _Mix_Music {

 	Mix_MusicType type;

 	union {

 #ifdef CMD_MUSIC

 		MusicCMD *cmd;

 #endif

 #ifdef WAV_MUSIC

 		WAVStream *wave;

 #endif

 #ifdef MOD_MUSIC

 		struct MODULE *module;

 #endif

 #ifdef MID_MUSIC

 #ifdef USE_TIMIDITY_MIDI

 		MidiSong *midi;

 #endif

 #ifdef USE_NATIVE_MIDI

 		NativeMidiSong *nativemidi;

 #endif

 #endif

 #ifdef OGG_MUSIC

 		OGG_music *ogg;

 #endif

 #ifdef MP3_MUSIC

 		SMPEG *mp3;

 #endif

 #ifdef MP3_MAD_MUSIC

 		mad_data *mp3_mad;

 #endif

 #ifdef FLAC_MUSIC

 		FLAC_music *flac;

 #endif

 	} data;

 	Mix_Fading fading;

 	int fade_step;

 	int fade_steps;

 	int error;

 };

 #ifdef MID_MUSIC

 #ifdef USE_TIMIDITY_MIDI

 static int timidity_ok;

 static int samplesize;

 #endif

 #ifdef USE_NATIVE_MIDI

 static int native_midi_ok;

 #endif

 #endif

 /* Used to calculate fading steps */

 static int ms_per_step;

 /* rcg06042009 report available decoders at runtime. */

 static const char **music_decoders = NULL;

 static int num_decoders = 0;

 int Mix_GetNumMusicDecoders(void)

 {

 	return(num_decoders);

 }

 const char *Mix_GetMusicDecoder(int index)

 {

 	if ((index < 0) || (index >= num_decoders)) {

 		return NULL;

 	}

 	return(music_decoders[index]);

 }

 static void add_music_decoder(const char *decoder)

 {

 	void *ptr = realloc(music_decoders, (num_decoders + 1) * sizeof (const char **));

 	if (ptr == NULL) {

 		return;  /* oh well, go on without it. */

 	}

 	music_decoders = (const char **) ptr;

 	music_decoders[num_decoders++] = decoder;

 }

 /* Local low-level functions prototypes */

 static void music_internal_initialize_volume(void);

 static void music_internal_volume(int volume);

 static int  music_internal_play(Mix_Music *music, double position);

 static int  music_internal_position(double position);

 static int  music_internal_playing();

 static void music_internal_halt(void);

 /* Support for hooking when the music has finished */

 static void (*music_finished_hook)(void) = NULL;

 void Mix_HookMusicFinished(void (*music_finished)(void))

 {

 	SDL_LockAudio();

 	music_finished_hook = music_finished;

 	SDL_UnlockAudio();

 }

 /* If music isn't playing, halt it if no looping is required, restart it */

 /* otherwhise. NOP if the music is playing */

 static int music_halt_or_loop (void)

 {

 	/* Restart music if it has to loop */

 	if (!music_internal_playing()) 

 	{

 		/* Restart music if it has to loop at a high level */

 		if (music_loops && --music_loops)

 		{

 			Mix_Fading current_fade = music_playing->fading;

 			music_internal_play(music_playing, 0.0);

 			music_playing->fading = current_fade;

 		} 

 		else 

 		{

 			music_internal_halt();

 			if (music_finished_hook)

 				music_finished_hook();

 			return 0;

 		}

 	}

 	return 1;

 }

 /* Mixing function */

 void music_mixer(void *udata, Uint8 *stream, int len)

 {

 	int left = 0;

 	if ( music_playing && music_active ) {

 		/* Handle fading */

 		if ( music_playing->fading != MIX_NO_FADING ) {

 			if ( music_playing->fade_step++ < music_playing->fade_steps ) {

 				int volume;

 				int fade_step = music_playing->fade_step;

 				int fade_steps = music_playing->fade_steps;

 				if ( music_playing->fading == MIX_FADING_OUT ) {

 					volume = (music_volume * (fade_steps-fade_step)) / fade_steps;

 				} else { /* Fading in */

 					volume = (music_volume * fade_step) / fade_steps;

 				}

 				music_internal_volume(volume);

 			} else {

 				if ( music_playing->fading == MIX_FADING_OUT ) {

 					music_internal_halt();

 					if ( music_finished_hook ) {

 						music_finished_hook();

 					}

 					return;

 				}

 				music_playing->fading = MIX_NO_FADING;

 			}

 		}

 		if (music_halt_or_loop() == 0)

 			return;

 		switch (music_playing->type) {

 #ifdef CMD_MUSIC

 			case MUS_CMD:

 				/* The playing is done externally */

 				break;

 #endif

 #ifdef WAV_MUSIC

 			case MUS_WAV:

 				left = WAVStream_PlaySome(stream, len);

 				break;

 #endif

 #ifdef MOD_MUSIC

 			case MUS_MOD:

 				left = MOD_playAudio(music_playing->data.module, stream, len);

 				break;

 #endif

 #ifdef MID_MUSIC

 #ifdef USE_TIMIDITY_MIDI

 			case MUS_MID:

 				if ( timidity_ok ) {

 					int samples = len / samplesize;

   					Timidity_PlaySome(stream, samples);

 				}

 				break;

 #endif

 #endif

 #ifdef OGG_MUSIC

 			case MUS_OGG:

 				left = OGG_playAudio(music_playing->data.ogg, stream, len);

 				break;

 #endif

 #ifdef FLAC_MUSIC

 			case MUS_FLAC:

 				left = FLAC_playAudio(music_playing->data.flac, stream, len);

 				break;

 #endif

 #ifdef MP3_MUSIC

 			case MUS_MP3:

 				left = (len - smpeg.SMPEG_playAudio(music_playing->data.mp3, stream, len));

 				break;

 #endif

 #ifdef MP3_MAD_MUSIC

 			case MUS_MP3_MAD:

 				left = mad_getSamples(music_playing->data.mp3_mad, stream, len);

 				break;

 #endif

 			default:

 				/* Unknown music type?? */

 				break;

 		}

 	}

 	/* Handle seamless music looping */

 	if (left > 0 && left < len && music_halt_or_loop()) {

 		music_mixer(udata, stream+(len-left), left);

 	}

 }

 /* Initialize the music players with a certain desired audio format */

 int open_music(SDL_AudioSpec *mixer)

 {

 	int music_error = 0;

 #ifdef WAV_MUSIC

 	if ( WAVStream_Init(mixer) < 0 ) {

 		++music_error;

 	} else {

 		add_music_decoder("WAVE");

 	}

 #endif

 #ifdef MOD_MUSIC

 	if ( MOD_init(mixer) < 0 ) {

 		++music_error;

 	} else {

 		add_music_decoder("MIKMOD");

 	}

 #endif

 #ifdef MID_MUSIC

 #ifdef USE_TIMIDITY_MIDI

 	samplesize = mixer->size / mixer->samples;

 	if ( Timidity_Init(mixer->freq, mixer->format,

 	                    mixer->channels, mixer->samples) == 0 ) {

 		timidity_ok = 1;

 		add_music_decoder("TIMIDITY");

 	} else {

 		timidity_ok = 0;

 	}

 #endif

 #ifdef USE_NATIVE_MIDI

 #ifdef USE_TIMIDITY_MIDI

 	native_midi_ok = !timidity_ok;

 	if ( !native_midi_ok ) {

 		native_midi_ok = (getenv("SDL_NATIVE_MUSIC") != NULL);

 	}

 	if ( native_midi_ok )

 #endif

 		native_midi_ok = native_midi_detect();

 	if ( native_midi_ok )

 		add_music_decoder("NATIVEMIDI");

 #endif

 #endif

 #ifdef OGG_MUSIC

 	if ( OGG_init(mixer) < 0 ) {

 		++music_error;

 	} else {

 		add_music_decoder("OGG");

 	}

 #endif

 #ifdef FLAC_MUSIC

 	if ( FLAC_init(mixer) < 0 ) {

 		++music_error;

 	} else {

 		add_music_decoder("FLAC");

 	}

 #endif

 #if defined(MP3_MUSIC) || defined(MP3_MAD_MUSIC)

 	/* Keep a copy of the mixer */

 	used_mixer = *mixer;

 	add_music_decoder("MP3");

 #endif

 	music_playing = NULL;

 	music_stopped = 0;

 	if ( music_error ) {

 		return(-1);

 	}

 	Mix_VolumeMusic(SDL_MIX_MAXVOLUME);

 	/* Calculate the number of ms for each callback */

 	ms_per_step = (int) (((float)mixer->samples * 1000.0) / mixer->freq);

 	return(0);

 }

 /* Portable case-insensitive string compare function */

 int MIX_string_equals(const char *str1, const char *str2)

 {

 	while ( *str1 && *str2 ) {

 		if ( toupper((unsigned char)*str1) !=

 		     toupper((unsigned char)*str2) )

 			break;

 		++str1;

 		++str2;

 	}

 	return (!*str1 && !*str2);

 }

 /* Load a music file */

 Mix_Music *Mix_LoadMUS(const char *file)

 {

 	FILE *fp;

 	char *ext;

 	Uint8 magic[5], moremagic[9];

 	Mix_Music *music;

 	/* Figure out what kind of file this is */

 	fp = fopen(file, "rb");

 	if ( (fp == NULL) || !fread(magic, 4, 1, fp) ) {

 		if ( fp != NULL ) {

 			fclose(fp);

 		}

 		Mix_SetError("Couldn't read from '%s'", file);

 		return(NULL);

 	}

 	if (!fread(moremagic, 8, 1, fp)) {

 		Mix_SetError("Couldn't read from '%s'", file);

 		return(NULL);

 	}

 	magic[4] = '\0';

 	moremagic[8] = '\0';

 	fclose(fp);

 	/* Figure out the file extension, so we can determine the type */

 	ext = strrchr(file, '.');

 	if ( ext ) ++ext; /* skip the dot in the extension */

 	/* Allocate memory for the music structure */

 	music = (Mix_Music *)malloc(sizeof(Mix_Music));

 	if ( music == NULL ) {

 		Mix_SetError("Out of memory");

 		return(NULL);

 	}

 	music->error = 0;

 #ifdef CMD_MUSIC

 	if ( music_cmd ) {

 		music->type = MUS_CMD;

 		music->data.cmd = MusicCMD_LoadSong(music_cmd, file);

 		if ( music->data.cmd == NULL ) {

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef WAV_MUSIC

 	/* WAVE files have the magic four bytes "RIFF"

 	   AIFF files have the magic 12 bytes "FORM" XXXX "AIFF"

 	 */

 	if ( (ext && MIX_string_equals(ext, "WAV")) ||

 	     ((strcmp((char *)magic, "RIFF") == 0) && (strcmp((char *)(moremagic+4), "WAVE") == 0)) ||

 	     (strcmp((char *)magic, "FORM") == 0) ) {

 		music->type = MUS_WAV;

 		music->data.wave = WAVStream_LoadSong(file, (char *)magic);

 		if ( music->data.wave == NULL ) {

 		  	Mix_SetError("Unable to load WAV file");

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef MID_MUSIC

 	/* MIDI files have the magic four bytes "MThd" */

 	if ( (ext && MIX_string_equals(ext, "MID")) ||

 	     (ext && MIX_string_equals(ext, "MIDI")) ||

 	     strcmp((char *)magic, "MThd") == 0  ||

 	     ( strcmp((char *)magic, "RIFF") == 0  &&

 	  	strcmp((char *)(moremagic+4), "RMID") == 0 ) ) {

 		music->type = MUS_MID;

 #ifdef USE_NATIVE_MIDI

   		if ( native_midi_ok ) {

   			music->data.nativemidi = native_midi_loadsong(file);

 	  		if ( music->data.nativemidi == NULL ) {

 		  		Mix_SetError("%s", native_midi_error());

 			  	music->error = 1;

 			}

 	  	} MIDI_ELSE

 #endif

 #ifdef USE_TIMIDITY_MIDI

 		if ( timidity_ok ) {

 			music->data.midi = Timidity_LoadSong(file);

 			if ( music->data.midi == NULL ) {

 				Mix_SetError("%s", Timidity_Error());

 				music->error = 1;

 			}

 		} else {

 			Mix_SetError("%s", Timidity_Error());

 			music->error = 1;

 		}

 #endif

 	} else

 #endif

 #ifdef OGG_MUSIC

 	/* Ogg Vorbis files have the magic four bytes "OggS" */

 	if ( (ext && MIX_string_equals(ext, "OGG")) ||

 	     strcmp((char *)magic, "OggS") == 0 ) {

 		music->type = MUS_OGG;

 		music->data.ogg = OGG_new(file);

 		if ( music->data.ogg == NULL ) {

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef FLAC_MUSIC

 	/* FLAC files have the magic four bytes "fLaC" */

 	if ( (ext && MIX_string_equals(ext, "FLAC")) ||

 		 strcmp((char *)magic, "fLaC") == 0 ) {

 		music->type = MUS_FLAC;

 		music->data.flac = FLAC_new(file);

 		if ( music->data.flac == NULL ) {

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef MP3_MUSIC

 	if ( (ext && MIX_string_equals(ext, "MPG")) ||

 	     (ext && MIX_string_equals(ext, "MP3")) ||

 	     (ext && MIX_string_equals(ext, "MPEG")) ||

 	     (magic[0] == 0xFF && (magic[1] & 0xF0) == 0xF0) ||

 	     (strncmp((char *)magic, "ID3", 3) == 0) ) {

 		if ( Mix_InitMP3() == 0 ) {

 			SMPEG_Info info;

 			music->type = MUS_MP3;

 			music->data.mp3 = smpeg.SMPEG_new(file, &info, 0);

 			if ( !info.has_audio ) {

 				Mix_SetError("MPEG file does not have any audio stream.");

 				music->error = 1;

 			} else {

 				smpeg.SMPEG_actualSpec(music->data.mp3, &used_mixer);

 			}

 		} else {

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef MP3_MAD_MUSIC

 	if ( (ext && MIX_string_equals(ext, "MPG")) ||

 	     (ext && MIX_string_equals(ext, "MP3")) ||

 	     (ext && MIX_string_equals(ext, "MPEG")) ||

 	     (ext && MIX_string_equals(ext, "MAD")) ||

 	     (magic[0] == 0xFF && (magic[1] & 0xF0) == 0xF0) ||

 	     (strncmp((char *)magic, "ID3", 3) == 0) ) {

 		music->type = MUS_MP3_MAD;

 		music->data.mp3_mad = mad_openFile(file, &used_mixer);

 		if (music->data.mp3_mad == 0) {

 		    Mix_SetError("Could not initialize MPEG stream.");

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef MOD_MUSIC

 	if ( 1 ) {

 		music->type = MUS_MOD;

 		music->data.module = MOD_new(file);

 		if ( music->data.module == NULL ) {

 			music->error = 1;

 		}

 	} else

 #endif

 	{

 		Mix_SetError("Unrecognized music format");

 		music->error = 1;

 	}

 	if ( music->error ) {

 		free(music);

 		music = NULL;

 	}

 	return(music);

 }

 /* Free a music chunk previously loaded */

 void Mix_FreeMusic(Mix_Music *music)

 {

 	if ( music ) {

 		/* Stop the music if it's currently playing */

 		SDL_LockAudio();

 		if ( music == music_playing ) {

 			/* Wait for any fade out to finish */

 			while ( music->fading == MIX_FADING_OUT ) {

 				SDL_UnlockAudio();

 				SDL_Delay(100);

 				SDL_LockAudio();

 			}

 			if ( music == music_playing ) {

 				music_internal_halt();

 			}

 		}

 		SDL_UnlockAudio();

 		switch (music->type) {

 #ifdef CMD_MUSIC

 			case MUS_CMD:

 				MusicCMD_FreeSong(music->data.cmd);

 				break;

 #endif

 #ifdef WAV_MUSIC

 			case MUS_WAV:

 				WAVStream_FreeSong(music->data.wave);

 				break;

 #endif

 #ifdef MOD_MUSIC

 			case MUS_MOD:

 				MOD_delete(music->data.module);

 				break;

 #endif

 #ifdef MID_MUSIC

 			case MUS_MID:

 #ifdef USE_NATIVE_MIDI

   				if ( native_midi_ok ) {

 					native_midi_freesong(music->data.nativemidi);

 				} MIDI_ELSE

 #endif

 #ifdef USE_TIMIDITY_MIDI

 				if ( timidity_ok ) {

 					Timidity_FreeSong(music->data.midi);

 				}

 #endif

 				break;

 #endif

 #ifdef OGG_MUSIC

 			case MUS_OGG:

 				OGG_delete(music->data.ogg);

 				break;

 #endif

 #ifdef FLAC_MUSIC

 			case MUS_FLAC:

 				FLAC_delete(music->data.flac);

 				break;

 #endif

 #ifdef MP3_MUSIC

 			case MUS_MP3:

 				smpeg.SMPEG_delete(music->data.mp3);

 				Mix_QuitMP3();

 				break;

 #endif

 #ifdef MP3_MAD_MUSIC

 			case MUS_MP3_MAD:

 				mad_closeFile(music->data.mp3_mad);

 				break;

 #endif

 			default:

 				/* Unknown music type?? */

 				break;

 		}

 		free(music);

 	}

 }

 /* Find out the music format of a mixer music, or the currently playing

    music, if 'music' is NULL.

 */

 Mix_MusicType Mix_GetMusicType(const Mix_Music *music)

 {

 	Mix_MusicType type = MUS_NONE;

 	if ( music ) {

 		type = music->type;

 	} else {

 		SDL_LockAudio();

 		if ( music_playing ) {

 			type = music_playing->type;

 		}

 		SDL_UnlockAudio();

 	}

 	return(type);

 }

 /* Play a music chunk.  Returns 0, or -1 if there was an error.

  */

 static int music_internal_play(Mix_Music *music, double position)

 {

 	int retval = 0;

 	/* Note the music we're playing */

 	if ( music_playing ) {

 		music_internal_halt();

 	}

 	music_playing = music;

 	/* Set the initial volume */

 	if ( music->type != MUS_MOD ) {

 		music_internal_initialize_volume();

 	}

 	/* Set up for playback */

 	switch (music->type) {

 #ifdef CMD_MUSIC

 	    case MUS_CMD:

 		MusicCMD_Start(music->data.cmd);

 		break;

 #endif

 #ifdef WAV_MUSIC

 	    case MUS_WAV:

 		WAVStream_Start(music->data.wave);

 		break;

 #endif

 #ifdef MOD_MUSIC

 	    case MUS_MOD:

 		MOD_play(music->data.module);

 		/* Player_SetVolume() does nothing before Player_Start() */

 		music_internal_initialize_volume();

 		break;

 #endif

 #ifdef MID_MUSIC

 	    case MUS_MID:

 #ifdef USE_NATIVE_MIDI

 		if ( native_midi_ok ) {

 			native_midi_start(music->data.nativemidi);

 		} MIDI_ELSE

 #endif

 #ifdef USE_TIMIDITY_MIDI

 		if ( timidity_ok ) {

 			Timidity_Start(music->data.midi);

 		}

 #endif

 		break;

 #endif

 #ifdef OGG_MUSIC

 	    case MUS_OGG:

 		OGG_play(music->data.ogg);

 		break;

 #endif

 #ifdef FLAC_MUSIC

 	    case MUS_FLAC:

 		FLAC_play(music->data.flac);

 		break;

 #endif

 #ifdef MP3_MUSIC

 	    case MUS_MP3:

 		smpeg.SMPEG_enableaudio(music->data.mp3,1);

 		smpeg.SMPEG_enablevideo(music->data.mp3,0);

 		smpeg.SMPEG_play(music_playing->data.mp3);

 		break;

 #endif

 #ifdef MP3_MAD_MUSIC

 	    case MUS_MP3_MAD:

 		mad_start(music->data.mp3_mad);

 		break;

 #endif

 	    default:

 		Mix_SetError("Can't play unknown music type");

 		retval = -1;

 		break;

 	}

 	/* Set the playback position, note any errors if an offset is used */

 	if ( retval == 0 ) {

 		if ( position > 0.0 ) {

 			if ( music_internal_position(position) < 0 ) {

 				Mix_SetError("Position not implemented for music type");

 				retval = -1;

 			}

 		} else {

 			music_internal_position(0.0);

 		}

 	}

 	/* If the setup failed, we're not playing any music anymore */

 	if ( retval < 0 ) {

 		music_playing = NULL;

 	}

 	return(retval);

 }

 int Mix_FadeInMusicPos(Mix_Music *music, int loops, int ms, double position)

 {

 	int retval;

 	/* Don't play null pointers :-) */

 	if ( music == NULL ) {

 		Mix_SetError("music parameter was NULL");

 		return(-1);

 	}

 	/* Setup the data */

 	if ( ms ) {

 		music->fading = MIX_FADING_IN;

 	} else {

 		music->fading = MIX_NO_FADING;

 	}

 	music->fade_step = 0;

 	music->fade_steps = ms/ms_per_step;

 	/* Play the puppy */

 	SDL_LockAudio();

 	/* If the current music is fading out, wait for the fade to complete */

 	while ( music_playing && (music_playing->fading == MIX_FADING_OUT) ) {

 		SDL_UnlockAudio();

 		SDL_Delay(100);

 		SDL_LockAudio();

 	}

 	music_active = 1;

 	music_loops = loops;

 	retval = music_internal_play(music, position);

 	SDL_UnlockAudio();

 	return(retval);

 }

 int Mix_FadeInMusic(Mix_Music *music, int loops, int ms)

 {

 	return Mix_FadeInMusicPos(music, loops, ms, 0.0);

 }

 int Mix_PlayMusic(Mix_Music *music, int loops)

 {

 	return Mix_FadeInMusicPos(music, loops, 0, 0.0);

 }

 /* Set the playing music position */

 int music_internal_position(double position)

 {

 	int retval = 0;

 	switch (music_playing->type) {

 #ifdef MOD_MUSIC

 	    case MUS_MOD:

 		MOD_jump_to_time(music_playing->data.module, position);

 		break;

 #endif

 #ifdef OGG_MUSIC

 	    case MUS_OGG:

 		OGG_jump_to_time(music_playing->data.ogg, position);

 		break;

 #endif

 #ifdef FLAC_MUSIC

 	    case MUS_FLAC:

 		FLAC_jump_to_time(music_playing->data.flac, position);

 		break;

 #endif

 #ifdef MP3_MUSIC

 	    case MUS_MP3:

 		if ( position > 0.0 ) {

 			smpeg.SMPEG_skip(music_playing->data.mp3, (float)position);

 		} else {

 			smpeg.SMPEG_rewind(music_playing->data.mp3);

 			smpeg.SMPEG_play(music_playing->data.mp3);

 		}

 		break;

 #endif

 #ifdef MP3_MAD_MUSIC

 	    case MUS_MP3_MAD:

 		mad_seek(music_playing->data.mp3_mad, position);

 		break;

 #endif

 	    default:

 		/* TODO: Implement this for other music backends */

 		retval = -1;

 		break;

 	}

 	return(retval);

 }

 int Mix_SetMusicPosition(double position)

 {

 	int retval;

 	SDL_LockAudio();

 	if ( music_playing ) {

 		retval = music_internal_position(position);

 		if ( retval < 0 ) {

 			Mix_SetError("Position not implemented for music type");

 		}

 	} else {

 		Mix_SetError("Music isn't playing");

 		retval = -1;

 	}

 	SDL_UnlockAudio();

 	return(retval);

 }

 /* Set the music's initial volume */

 static void music_internal_initialize_volume(void)

 {

 	if ( music_playing->fading == MIX_FADING_IN ) {

 		music_internal_volume(0);

 	} else {

 		music_internal_volume(music_volume);

 	}

 }

 /* Set the music volume */

 static void music_internal_volume(int volume)

 {

 	switch (music_playing->type) {

 #ifdef CMD_MUSIC

 	    case MUS_CMD:

 		MusicCMD_SetVolume(volume);

 		break;

 #endif

 #ifdef WAV_MUSIC

 	    case MUS_WAV:

 		WAVStream_SetVolume(volume);

 		break;

 #endif

 #ifdef MOD_MUSIC

 	    case MUS_MOD:

 		MOD_setvolume(music_playing->data.module, volume);

 		break;

 #endif

 #ifdef MID_MUSIC

 	    case MUS_MID:

 #ifdef USE_NATIVE_MIDI

 		if ( native_midi_ok ) {

 			native_midi_setvolume(volume);

 		} MIDI_ELSE

 #endif

 #ifdef USE_TIMIDITY_MIDI

 		if ( timidity_ok ) {

 			Timidity_SetVolume(volume);

 		}

 #endif

 		break;

 #endif

 #ifdef OGG_MUSIC

 	    case MUS_OGG:

 		OGG_setvolume(music_playing->data.ogg, volume);

 		break;

 #endif

 #ifdef FLAC_MUSIC

 	    case MUS_FLAC:

 		FLAC_setvolume(music_playing->data.flac, volume);

 		break;

 #endif

 #ifdef MP3_MUSIC

 	    case MUS_MP3:

 		smpeg.SMPEG_setvolume(music_playing->data.mp3,(int)(((float)volume/(float)MIX_MAX_VOLUME)*100.0));

 		break;

 #endif

 #ifdef MP3_MAD_MUSIC

 	    case MUS_MP3_MAD:

 		mad_setVolume(music_playing->data.mp3_mad, volume);

 		break;

 #endif

 	    default:

 		/* Unknown music type?? */

 		break;

 	}

 }

 int Mix_VolumeMusic(int volume)

 {

 	int prev_volume;

 	prev_volume = music_volume;

 	if ( volume < 0 ) {

 		return prev_volume;

 	}

 	if ( volume > SDL_MIX_MAXVOLUME ) {

 		volume = SDL_MIX_MAXVOLUME;

 	}

 	music_volume = volume;

 	SDL_LockAudio();

 	if ( music_playing ) {

 		music_internal_volume(music_volume);

 	}

 	SDL_UnlockAudio();

 	return(prev_volume);

 }

 /* Halt playing of music */

 static void music_internal_halt(void)

 {

 	switch (music_playing->type) {

 #ifdef CMD_MUSIC

 	    case MUS_CMD:

 		MusicCMD_Stop(music_playing->data.cmd);

 		break;

 #endif

 #ifdef WAV_MUSIC

 	    case MUS_WAV:

 		WAVStream_Stop();

 		break;

 #endif

 #ifdef MOD_MUSIC

 	    case MUS_MOD:

 		MOD_stop(music_playing->data.module);

 		break;

 #endif

 #ifdef MID_MUSIC

 	    case MUS_MID:

 #ifdef USE_NATIVE_MIDI

 		if ( native_midi_ok ) {

 			native_midi_stop();

 		} MIDI_ELSE

 #endif

 #ifdef USE_TIMIDITY_MIDI

 		if ( timidity_ok ) {

 			Timidity_Stop();

 		}

 #endif

 		break;

 #endif

 #ifdef OGG_MUSIC

 	    case MUS_OGG:

 		OGG_stop(music_playing->data.ogg);

 		break;

 #endif

 #ifdef FLAC_MUSIC

 	    case MUS_FLAC:

 		FLAC_stop(music_playing->data.flac);

 		break;

 #endif

 #ifdef MP3_MUSIC

 	    case MUS_MP3:

 		smpeg.SMPEG_stop(music_playing->data.mp3);

 		break;

 #endif

 #ifdef MP3_MAD_MUSIC

 	    case MUS_MP3_MAD:

 		mad_stop(music_playing->data.mp3_mad);

 		break;

 #endif

 	    default:

 		/* Unknown music type?? */

 		return;

 	}

 	music_playing->fading = MIX_NO_FADING;

 	music_playing = NULL;

 }

 int Mix_HaltMusic(void)

 {

 	SDL_LockAudio();

 	if ( music_playing ) {

 		music_internal_halt();

 	}

 	SDL_UnlockAudio();

 	return(0);

 }

 /* Progressively stop the music */

 int Mix_FadeOutMusic(int ms)

 {

 	int retval = 0;

 	if (ms <= 0) {  /* just halt immediately. */

 		Mix_HaltMusic();

 		return 1;

 	}

 	SDL_LockAudio();

 	if ( music_playing) {

                 int fade_steps = (ms + ms_per_step - 1)/ms_per_step;

                 if ( music_playing->fading == MIX_NO_FADING ) {

 	        	music_playing->fade_step = 0;

                 } else {

                         int step;

                         int old_fade_steps = music_playing->fade_steps;

                         if ( music_playing->fading == MIX_FADING_OUT ) {

                                 step = music_playing->fade_step;

                         } else {

                                 step = old_fade_steps

                                         - music_playing->fade_step + 1;

                         }

                         music_playing->fade_step = (step * fade_steps)

                                 / old_fade_steps;

                 }

 		music_playing->fading = MIX_FADING_OUT;

 		music_playing->fade_steps = fade_steps;

 		retval = 1;

 	}

 	SDL_UnlockAudio();

 	return(retval);

 }

 Mix_Fading Mix_FadingMusic(void)

 {

 	Mix_Fading fading = MIX_NO_FADING;

 	SDL_LockAudio();

 	if ( music_playing ) {

 		fading = music_playing->fading;

 	}

 	SDL_UnlockAudio();

 	return(fading);

 }

 /* Pause/Resume the music stream */

 void Mix_PauseMusic(void)

 {

 	music_active = 0;

 }

 void Mix_ResumeMusic(void)

 {

 	music_active = 1;

 }

 void Mix_RewindMusic(void)

 {

 	Mix_SetMusicPosition(0.0);

 }

 int Mix_PausedMusic(void)

 {

 	return (music_active == 0);

 }

 /* Check the status of the music */

 static int music_internal_playing()

 {

 	int playing = 1;

 	switch (music_playing->type) {

 #ifdef CMD_MUSIC

 	    case MUS_CMD:

 		if (!MusicCMD_Active(music_playing->data.cmd)) {

 			playing = 0;

 		}

 		break;

 #endif

 #ifdef WAV_MUSIC

 	    case MUS_WAV:

 		if ( ! WAVStream_Active() ) {

 			playing = 0;

 		}

 		break;

 #endif

 #ifdef MOD_MUSIC

 	    case MUS_MOD:

 		if ( ! MOD_playing(music_playing->data.module) ) {

 			playing = 0;

 		}

 		break;

 #endif

 #ifdef MID_MUSIC

 	    case MUS_MID:

 #ifdef USE_NATIVE_MIDI

 		if ( native_midi_ok ) {

 			if ( ! native_midi_active() )

 				playing = 0;

 		} MIDI_ELSE

 #endif

 #ifdef USE_TIMIDITY_MIDI

 		if ( timidity_ok ) {

 			if ( ! Timidity_Active() )

 				playing = 0;

 		}

 #endif

 		break;

 #endif

 #ifdef OGG_MUSIC

 	    case MUS_OGG:

 		if ( ! OGG_playing(music_playing->data.ogg) ) {

 			playing = 0;

 		}

 		break;

 #endif

 #ifdef FLAC_MUSIC

 	    case MUS_FLAC:

 		if ( ! FLAC_playing(music_playing->data.flac) ) {

 			playing = 0;

 		}

 		break;

 #endif

 #ifdef MP3_MUSIC

 	    case MUS_MP3:

 		if ( smpeg.SMPEG_status(music_playing->data.mp3) != SMPEG_PLAYING )

 			playing = 0;

 		break;

 #endif

 #ifdef MP3_MAD_MUSIC

 	    case MUS_MP3_MAD:

 		if (!mad_isPlaying(music_playing->data.mp3_mad)) {

 			playing = 0;

 		}

 		break;

 #endif

 	    default:

 		playing = 0;

 		break;

 	}

 	return(playing);

 }

 int Mix_PlayingMusic(void)

 {

 	int playing = 0;

 	SDL_LockAudio();

 	if ( music_playing ) {

 		playing = music_internal_playing();

 	}

 	SDL_UnlockAudio();

 	return(playing);

 }

 /* Set the external music playback command */

 int Mix_SetMusicCMD(const char *command)

 {

 	Mix_HaltMusic();

 	if ( music_cmd ) {

 		free(music_cmd);

 		music_cmd = NULL;

 	}

 	if ( command ) {

 		music_cmd = (char *)malloc(strlen(command)+1);

 		if ( music_cmd == NULL ) {

 			return(-1);

 		}

 		strcpy(music_cmd, command);

 	}

 	return(0);

 }

 int Mix_SetSynchroValue(int i)

 {

 	/* Not supported by any players at this time */

 	return(-1);

 }

 int Mix_GetSynchroValue(void)

 {

 	/* Not supported by any players at this time */

 	return(-1);

 }

 /* Uninitialize the music players */

 void close_music(void)

 {

 	Mix_HaltMusic();

 #ifdef CMD_MUSIC

 	Mix_SetMusicCMD(NULL);

 #endif

 #ifdef MOD_MUSIC

 	MOD_exit();

 #endif

 #ifdef MID_MUSIC

 # ifdef USE_TIMIDITY_MIDI

 	Timidity_Close();

 # endif

 #endif

 	/* rcg06042009 report available decoders at runtime. */

 	free(music_decoders);

 	music_decoders = NULL;

 	num_decoders = 0;

 }

 Mix_Music *Mix_LoadMUS_RW(SDL_RWops *rw)

 {

 	Uint8 magic[5];	  /*Apparently there is no way to check if the file is really a MOD,*/

 	/*		    or there are too many formats supported by MikMod or MikMod does */

 	/*		    this check by itself. If someone implements other formats (e.g. MP3) */

 	/*		    the check can be uncommented */

 	Uint8 moremagic[9];

 	Mix_Music *music;

 	int start;

 	if (!rw) {

 		Mix_SetError("RWops pointer is NULL");

 		return NULL;

 	}

 	/* Figure out what kind of file this is */

 	start = SDL_RWtell(rw);

 	if ( SDL_RWread(rw,magic,1,4) != 4 ||

 	     SDL_RWread(rw,moremagic,1,8) != 8 ) {

 		Mix_SetError("Couldn't read from RWops");

 		return NULL;

 	}

 	SDL_RWseek(rw, start, SEEK_SET);

 	magic[4]='\0';

 	moremagic[8] = '\0';

 	/* Allocate memory for the music structure */

 	music=(Mix_Music *)malloc(sizeof(Mix_Music));

 	if (music==NULL ) {

 		Mix_SetError("Out of memory");

 		return(NULL);

 	}

 	music->error = 0;

 #ifdef WAV_MUSIC

 	/* WAVE files have the magic four bytes "RIFF"

 	   AIFF files have the magic 12 bytes "FORM" XXXX "AIFF"

 	 */

 	if ( ((strcmp((char *)magic, "RIFF") == 0) && (strcmp((char *)(moremagic+4), "WAVE") == 0)) ||

 	     (strcmp((char *)magic, "FORM") == 0) ) {

 		music->type = MUS_WAV;

 		music->data.wave = WAVStream_LoadSong_RW(rw, (char *)magic);

 		if ( music->data.wave == NULL ) {

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef OGG_MUSIC

 	/* Ogg Vorbis files have the magic four bytes "OggS" */

 	if ( strcmp((char *)magic, "OggS") == 0 ) {

 		music->type = MUS_OGG;

 		music->data.ogg = OGG_new_RW(rw);

 		if ( music->data.ogg == NULL ) {

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef FLAC_MUSIC

 	/* FLAC files have the magic four bytes "fLaC" */

 	if ( strcmp((char *)magic, "fLaC") == 0 ) {

 		music->type = MUS_FLAC;

 		music->data.flac = FLAC_new_RW(rw);

 		if ( music->data.flac == NULL ) {

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef MP3_MUSIC

 	if ( ( magic[0] == 0xFF && (magic[1] & 0xF0) == 0xF0) || ( strncmp((char *)magic, "ID3", 3) == 0 ) ) {

 		if ( Mix_InitMP3() == 0 ) {

 			SMPEG_Info info;

 			music->type = MUS_MP3;

 			music->data.mp3 = smpeg.SMPEG_new_rwops(rw, &info, 0);

 			if ( !info.has_audio ) {

 				Mix_SetError("MPEG file does not have any audio stream.");

 				music->error = 1;

 			} else {

 				smpeg.SMPEG_actualSpec(music->data.mp3, &used_mixer);

 			}

 		} else {

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef MP3_MAD_MUSIC

 	if ( ( magic[0] == 0xFF && (magic[1] & 0xF0) == 0xF0) || ( strncmp((char *)magic, "ID3", 3) == 0 ) ) {

 		music->type = MUS_MP3_MAD;

 		music->data.mp3_mad = mad_openFileRW(rw, &used_mixer);

 		if (music->data.mp3_mad == 0) {

 			Mix_SetError("Could not initialize MPEG stream.");

 			music->error = 1;

 		}

 	} else

 #endif

 #ifdef MID_MUSIC

 	/* MIDI files have the magic four bytes "MThd" */

 	if ( strcmp((char *)magic, "MThd") == 0 ) {

 		music->type = MUS_MID;

 #ifdef USE_NATIVE_MIDI

 		if ( native_midi_ok ) {

 			music->data.nativemidi = native_midi_loadsong_RW(rw);

 	  		if ( music->data.nativemidi == NULL ) {

 		  		Mix_SetError("%s", native_midi_error());

 			  	music->error = 1;

 			}

 		} MIDI_ELSE

 #endif

 #ifdef USE_TIMIDITY_MIDI

 		if ( timidity_ok ) {

 			music->data.midi = Timidity_LoadSong_RW(rw);

 			if ( music->data.midi == NULL ) {

 				Mix_SetError("%s", Timidity_Error());

 				music->error = 1;

 			}

 		} else {

 			Mix_SetError("%s", Timidity_Error());

 			music->error = 1;

 		}

 #endif

 	} else

 #endif

 #ifdef MOD_MUSIC

 	if (1) {

 		music->type=MUS_MOD;

 		music->data.module = MOD_new_RW(rw);

 		if ( music->data.module == NULL ) {

 			music->error = 1;

 		}

 	} else

 #endif

 	{

 		Mix_SetError("Unrecognized music format");

 		music->error=1;

 	}

 	if (music->error) {

 		free(music);

 		music=NULL;

 	}

 	return(music);

 }