/*

    SDL_mixer:  An audio mixer library based on the SDL library

    Copyright (C) 1997-2004 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"

#define SDL_SURROUND

#ifdef SDL_SURROUND

#define MAX_OUTPUT_CHANNELS 6

#else

#define MAX_OUTPUT_CHANNELS 2

#endif

/* 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

#if defined(MOD_MUSIC) || defined(LIBMIKMOD_MUSIC)

#  include "mikmod.h"

#  if defined(LIBMIKMOD_VERSION)                /* libmikmod 3.1.8 */

#    define UNIMOD			MODULE

#    define MikMod_Init()		MikMod_Init(NULL)

#    define MikMod_LoadSong(a,b)	Player_Load(a,b,0)

#    ifndef LIBMIKMOD_MUSIC

#    define MikMod_LoadSongRW(a,b)	Player_LoadRW(a,b,0)

#    endif

#    define MikMod_FreeSong		Player_Free

     extern int MikMod_errno;

#  else                                        /* old MikMod 3.0.3 */

#    define MikMod_strerror(x)		_mm_errmsg[x])

#    define MikMod_errno		_mm_errno

#  endif

#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"

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;

static int music_swap8;

static int music_swap16;

struct _Mix_Music {

	Mix_MusicType type;

	union {

#ifdef CMD_MUSIC

		MusicCMD *cmd;

#endif

#ifdef WAV_MUSIC

		WAVStream *wave;

#endif

#if defined(MOD_MUSIC) || defined(LIBMIKMOD_MUSIC)

		UNIMOD *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

	} 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

/* Reference for converting mikmod output to 4/6 channels */

static int current_output_channels;

static Uint16 current_output_format;

/* Used to calculate fading steps */

static int ms_per_step;

/* 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)

{

	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:

				WAVStream_PlaySome(stream, len);

				break;

#endif

#if defined(MOD_MUSIC) || defined(LIBMIKMOD_MUSIC)

			case MUS_MOD:

				if (current_output_channels > 2) {

					int small_len = 2 * len / current_output_channels;

					int i;

					Uint8 *src, *dst;

					VC_WriteBytes((SBYTE *)stream, small_len);

					/* and extend to len by copying channels */

					src = stream + small_len;

					dst = stream + len;

					switch (current_output_format & 0xFF) {

						case 8:

							for ( i=small_len/2; i; --i ) {

								src -= 2;

								dst -= current_output_channels;

								dst[0] = src[0];

								dst[1] = src[1];

								dst[2] = src[0];

								dst[3] = src[1];

								if (current_output_channels == 6) {

									dst[4] = src[0];

									dst[5] = src[1];

								}

							}

							break;

						case 16:

							for ( i=small_len/4; i; --i ) {

								src -= 4;

								dst -= 2 * current_output_channels;

								dst[0] = src[0];

								dst[1] = src[1];

								dst[2] = src[2];

								dst[3] = src[3];

								dst[4] = src[0];

								dst[5] = src[1];

								dst[6] = src[2];

								dst[7] = src[3];

								if (current_output_channels == 6) {

									dst[8] = src[0];

									dst[9] = src[1];

									dst[10] = src[2];

									dst[11] = src[3];

								}

							}

							break;

					}

				}

				else VC_WriteBytes((SBYTE *)stream, len);

				if ( music_swap8 ) {

					Uint8 *dst;

					int i;

					dst = stream;

					for ( i=len; i; --i ) {

						*dst++ ^= 0x80;

					}

				} else

				if ( music_swap16 ) {

					Uint8 *dst, tmp;

					int i;

					dst = stream;

					for ( i=(len/2); i; --i ) {

						tmp = dst[0];

						dst[0] = dst[1];

						dst[1] = tmp;

						dst += 2;

					}

				}

				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:

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

				if (len > 0 && music_halt_or_loop())

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

				break;

#endif

#ifdef MP3_MUSIC

			case MUS_MP3:

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

				break;

#endif

			default:

				/* Unknown music type?? */

				break;

		}

	}

}

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

int open_music(SDL_AudioSpec *mixer)

{

	int music_error;

#ifdef LIBMIKMOD_MUSIC

	CHAR *list;

#endif

	music_error = 0;

#ifdef WAV_MUSIC

	if ( WAVStream_Init(mixer) < 0 ) {

		++music_error;

	}

#endif

#if defined(MOD_MUSIC) || defined(LIBMIKMOD_MUSIC)

	/* Set the MikMod music format */

	music_swap8 = 0;

	music_swap16 = 0;

	switch (mixer->format) {

		case AUDIO_U8:

		case AUDIO_S8: {

			if ( mixer->format == AUDIO_S8 ) {

				music_swap8 = 1;

			}

			md_mode = 0;

		}

		break;

		case AUDIO_S16LSB:

		case AUDIO_S16MSB: {

			/* See if we need to correct MikMod mixing */

#if SDL_BYTEORDER == SDL_LIL_ENDIAN

			if ( mixer->format == AUDIO_S16MSB ) {

#else

			if ( mixer->format == AUDIO_S16LSB ) {

#endif

				music_swap16 = 1;

			}

			md_mode = DMODE_16BITS;

		}

		break;

		default: {

			Mix_SetError("Unknown hardware audio format");

			++music_error;

		}

	}

	current_output_channels = mixer->channels;

	current_output_format = mixer->format;

	if ( mixer->channels > 1 ) {

		if ( mixer->channels > MAX_OUTPUT_CHANNELS ) {

			Mix_SetError("Hardware uses more channels than mixer");

			++music_error;

		}

		md_mode |= DMODE_STEREO;

	}

	md_mixfreq = mixer->freq;

	md_device  = 0;

	md_volume  = 96;

	md_musicvolume = 128;

	md_sndfxvolume = 128;

	md_pansep  = 128;

	md_reverb  = 0;

	md_mode    |= DMODE_HQMIXER|DMODE_SOFT_MUSIC|DMODE_SURROUND;

#ifdef LIBMIKMOD_MUSIC

	list = MikMod_InfoDriver();

	if ( list )

	  free(list);

	else

#endif

	MikMod_RegisterDriver(&drv_nos);

#ifdef LIBMIKMOD_MUSIC

	list = MikMod_InfoLoader();

	if ( list )

	  free(list);

	else

#endif

	MikMod_RegisterAllLoaders();

	if ( MikMod_Init() ) {

		Mix_SetError("%s", MikMod_strerror(MikMod_errno));

		++music_error;

	}

#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;

	} else {

		timidity_ok = 0;

	}

#endif

#ifdef USE_NATIVE_MIDI

#ifdef USE_TIMIDITY_MIDI

	native_midi_ok = !timidity_ok;

	if ( native_midi_ok )

#endif

		native_midi_ok = native_midi_detect();

#endif

#endif

#ifdef OGG_MUSIC

	if ( OGG_init(mixer) < 0 ) {

		++music_error;

	}

#endif

#ifdef MP3_MUSIC

	/* Keep a copy of the mixer */

	used_mixer = *mixer;

#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((char *)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((char *)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 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) ) {

		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

#if defined(MOD_MUSIC) || defined(LIBMIKMOD_MUSIC)

	if ( 1 ) {

		music->type = MUS_MOD;

		music->data.module = MikMod_LoadSong((char *)file, 64);

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

			Mix_SetError("%s", MikMod_strerror(MikMod_errno));

			music->error = 1;

		} else {

			/* Stop implicit looping, fade out and other flags. */

			music->data.module->extspd  = 1;

			music->data.module->panflag = 1;

			music->data.module->wrap    = 0;

			music->data.module->loop    = 1;

#if 0 /* Don't set fade out by default - unfortunately there's no real way

         to query the status of the song or set trigger actions.  Hum. */

			music->data.module->fadeout = 1;

#endif

		}

	} 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

#if defined(MOD_MUSIC) || defined(LIBMIKMOD_MUSIC)

			case MUS_MOD:

				MikMod_FreeSong(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 MP3_MUSIC

			case MUS_MP3:

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

				Mix_QuitMP3();

				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

#if defined(MOD_MUSIC) || defined(LIBMIKMOD_MUSIC)

	    case MUS_MOD:

		Player_Start(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 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

	    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) {

#if defined(MOD_MUSIC) || defined(LIBMIKMOD_MUSIC)

	    case MUS_MOD:

		Player_SetPosition((UWORD)position);

		break;

#endif

#ifdef OGG_MUSIC

	    case MUS_OGG:

		OGG_jump_to_time(music_playing->data.ogg, 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

	    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

#if defined(MOD_MUSIC) || defined(LIBMIKMOD_MUSIC)

	    case MUS_MOD:

		Player_SetVolume((SWORD)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 MP3_MUSIC

	    case MUS_MP3:

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

		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);