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music.c
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/*
MIXERLIB: An audio mixer library based on the SDL library
Copyright (C) 1997-1999 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
5635-34 Springhouse Dr.
Pleasanton, CA 94588 (USA)
slouken@devolution.com
*/
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#include <stdlib.h>
#include <string.h>
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#include <SDL/SDL_endian.h>
#include <SDL/SDL_audio.h>
#include "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 "mikmod.h"
#endif
#ifdef MID_MUSIC
#include "timidity.h"
#endif
#ifdef MP3_MUSIC
#include <smpeg/smpeg.h>
static SDL_AudioSpec used_mixer;
#endif
int music_active = 1;
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static int music_stopped = 0;
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static int music_loops = 0;
static char *music_cmd = NULL;
static int samplesize;
static Mix_Music *music_playing = 0;
static int music_volume;
static int music_swap8;
static int music_swap16;
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struct _Mix_Music {
enum {
MUS_CMD,
MUS_WAV,
MUS_MOD,
MUS_MID,
MUS_MP3
} type;
union {
#ifdef CMD_MUSIC
MusicCMD *cmd;
#endif
#ifdef WAV_MUSIC
WAVStream *wave;
#endif
#ifdef MOD_MUSIC
UNIMOD *module;
#endif
#ifdef MID_MUSIC
MidiSong *midi;
#endif
#ifdef MP3_MUSIC
SMPEG *mp3;
#endif
} data;
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Mix_Fading fading;
int fade_volume;
int fade_length;
Uint32 ticks_fade;
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int error;
};
static int timidity_ok;
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static void lowlevel_halt(void);
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/* Mixing function */
void music_mixer(void *udata, Uint8 *stream, int len)
{
int i;
if ( music_playing ) {
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if ( music_stopped ) {
/* To avoid concurrency problems and the use of mutexes,
the music is always stopped from the sound thread */
lowlevel_halt(); /* This function sets music_playing to NULL */
return;
}
if ( music_playing->fading != MIX_NO_FADING ) {
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Uint32 ticks = SDL_GetTicks() - music_playing->ticks_fade;
if( ticks > music_playing->fade_length ) {
if ( music_playing->fading == MIX_FADING_OUT ) {
music_volume = music_playing->fade_volume;
music_playing->fading = MIX_NO_FADING;
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lowlevel_halt();
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return;
}
music_playing->fading = MIX_NO_FADING;
} else {
if ( music_playing->fading == MIX_FADING_OUT ) {
Mix_VolumeMusic((music_playing->fade_volume * (music_playing->fade_length-ticks))
/ music_playing->fade_length);
} else { /* Fading in */
Mix_VolumeMusic((music_playing->fade_volume * ticks)
/ music_playing->fade_length);
}
}
}
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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
#ifdef MOD_MUSIC
case MUS_MOD:
VC_WriteBytes((SBYTE *)stream, len);
if ( music_swap8 ) {
Uint8 *dst;
dst = stream;
for ( i=len; i; --i ) {
*dst++ ^= 0x80;
}
} else
if ( music_swap16 ) {
Uint8 *dst, tmp;
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
case MUS_MID:
Timidity_PlaySome(stream, len/samplesize);
break;
#endif
#ifdef MP3_MUSIC
case MUS_MP3:
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;
music_error = 0;
#ifdef WAV_MUSIC
if ( WAVStream_Init(mixer) < 0 ) {
++music_error;
}
#endif
#ifdef MOD_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: {
SDL_SetError("Unknown hardware audio format");
++music_error;
}
}
if ( mixer->channels > 1 ) {
if ( mixer->channels > 2 ) {
SDL_SetError("Hardware uses more channels than mixer");
++music_error;
}
md_mode |= DMODE_STEREO;
}
samplesize = mixer->size/mixer->samples;
md_mixfreq = mixer->freq;
md_device = 0;
md_volume = 96;
md_musicvolume = 128;
md_sndfxvolume = 128;
md_pansep = 128;
md_reverb = 0;
MikMod_RegisterAllLoaders();
MikMod_RegisterAllDrivers();
if ( MikMod_Init() ) {
SDL_SetError("%s", _mm_errmsg[_mm_errno]);
++music_error;
}
#endif
#ifdef MID_MUSIC
if ( Timidity_Init(mixer->freq,
mixer->format, mixer->channels, mixer->samples) == 0 ) {
timidity_ok = 1;
} else {
timidity_ok = 0;
}
#endif
#ifdef MP3_MUSIC
/* Keep a copy of the mixer */
used_mixer = *mixer;
#endif
music_playing = 0;
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music_stopped = 0;
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if ( music_error ) {
return(-1);
}
Mix_VolumeMusic(SDL_MIX_MAXVOLUME);
return(0);
}
/* Load a music file */
Mix_Music *Mix_LoadMUS(const char *file)
{
FILE *fp;
unsigned char magic[5];
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);
}
SDL_SetError("Couldn't read from '%s'", file);
return(NULL);
}
magic[4] = '\0';
fclose(fp);
/* Allocate memory for the music structure */
music = (Mix_Music *)malloc(sizeof(Mix_Music));
if ( music == NULL ) {
SDL_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 ( (strcmp(magic, "RIFF") == 0) || (strcmp(magic, "FORM") == 0) ) {
music->type = MUS_WAV;
music->data.wave = WAVStream_LoadSong(file, magic);
if ( music->data.wave == NULL ) {
music->error = 1;
}
} else
#endif
#ifdef MID_MUSIC
/* MIDI files have the magic four bytes "MThd" */
if ( strcmp(magic, "MThd") == 0 ) {
music->type = MUS_MID;
if ( timidity_ok ) {
music->data.midi = Timidity_LoadSong((char *)file);
if ( music->data.midi == NULL ) {
SDL_SetError("%s", Timidity_Error());
music->error = 1;
}
}
else {
SDL_SetError("%s", Timidity_Error());
music->error = 1;
}
} else
#endif
#ifdef MP3_MUSIC
if ( magic[0]==0xFF && (magic[1]&0xF0)==0xF0) {
SMPEG_Info info;
music->type = MUS_MP3;
music->data.mp3 = SMPEG_new(file, &info, 0);
if(!info.has_audio){
SDL_SetError("MPEG file does not have any audio stream.");
music->error = 1;
}else{
SMPEG_actualSpec(music->data.mp3, &used_mixer);
}
} else
#endif
#ifdef MOD_MUSIC
if ( 1 ) {
music->type = MUS_MOD;
music->data.module = MikMod_LoadSong((char *)file, 64);
if ( music->data.module == NULL ) {
SDL_SetError("%s", _mm_errmsg[_mm_errno]);
music->error = 1;
}
} else
#endif
{
SDL_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 ) {
/* Caution: If music is playing, mixer will crash */
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if ( music == music_playing && !music_stopped ) {
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if ( music->fading == MIX_FADING_OUT ) {
/* Wait for the fade out to finish */
while(music->fading == MIX_FADING_OUT)
SDL_Delay(100);
} else {
Mix_HaltMusic(); /* Stop it immediately */
}
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}
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:
MikMod_FreeSong(music->data.module);
break;
#endif
#ifdef MID_MUSIC
case MUS_MID:
Timidity_FreeSong(music->data.midi);
break;
#endif
#ifdef MP3_MUSIC
case MUS_MP3:
SMPEG_delete(music->data.mp3);
break;
#endif
default:
/* Unknown music type?? */
break;
}
free(music);
}
}
/* Play a music chunk. Returns 0, or -1 if there was an error.
*/
int Mix_PlayMusic(Mix_Music *music, int loops)
{
/* Don't play null pointers :-) */
if ( music == NULL ) {
return(-1);
}
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/* If the current music is fading out, wait for the fade to complete */
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while ( music_playing && !music_stopped && music_playing->fading==MIX_FADING_OUT ) {
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SDL_Delay(100);
}
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switch (music->type) {
#ifdef CMD_MUSIC
case MUS_CMD:
MusicCMD_SetVolume(music_volume);
MusicCMD_Start(music->data.cmd);
break;
#endif
#ifdef WAV_MUSIC
case MUS_WAV:
WAVStream_SetVolume(music_volume);
WAVStream_Start(music->data.wave);
break;
#endif
#ifdef MOD_MUSIC
case MUS_MOD:
Player_SetVolume(music_volume);
Player_Start(music->data.module);
Player_SetPosition(0);
break;
#endif
#ifdef MID_MUSIC
case MUS_MID:
Timidity_SetVolume(music_volume);
Timidity_Start(music->data.midi);
break;
#endif
#ifdef MP3_MUSIC
case MUS_MP3:
SMPEG_enableaudio(music->data.mp3,1);
SMPEG_enablevideo(music->data.mp3,0);
SMPEG_setvolume(music->data.mp3,((float)music_volume/(float)MIX_MAX_VOLUME)*100.0);
SMPEG_loop(music->data.mp3, loops);
SMPEG_play(music->data.mp3);
break;
#endif
default:
/* Unknown music type?? */
return(-1);
}
music_active = 1;
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music_stopped = 0;
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music_playing = music;
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music_playing->fading = MIX_NO_FADING;
return(0);
}
/* Fade in a music over "ms" milliseconds */
int Mix_FadeInMusic(Mix_Music *music, int loops, int ms)
{
if ( music && music_volume > 0 ) { /* No need to fade if we can't hear it */
music->fade_volume = music_volume;
music_volume = 0;
if(Mix_PlayMusic(music,loops)<0)
return(-1);
music_playing->fading = MIX_FADING_IN;
music_playing->fade_length = ms;
music_playing->ticks_fade = SDL_GetTicks();
}
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return(0);
}
/* Set the music volume */
int Mix_VolumeMusic(int volume)
{
int prev_volume;
prev_volume = music_volume;
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if ( volume < 0 ) {
volume = 0;
}
if ( volume > SDL_MIX_MAXVOLUME ) {
volume = SDL_MIX_MAXVOLUME;
}
music_volume = volume;
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if ( music_playing && !music_stopped ) {
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switch (music_playing->type) {
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#ifdef CMD_MUSIC
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case MUS_CMD:
MusicCMD_SetVolume(music_volume);
break;
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#endif
#ifdef WAV_MUSIC
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case MUS_WAV:
WAVStream_SetVolume(music_volume);
break;
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#endif
#ifdef MOD_MUSIC
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case MUS_MOD:
Player_SetVolume(music_volume);
break;
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#endif
#ifdef MID_MUSIC
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case MUS_MID:
Timidity_SetVolume(music_volume);
break;
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#endif
#ifdef MP3_MUSIC
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case MUS_MP3:
SMPEG_setvolume(music_playing->data.mp3,((float)music_volume/(float)MIX_MAX_VOLUME)*100.0);
break;
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#endif
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default:
/* Unknown music type?? */
break;
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}
}
return(prev_volume);
}
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static void lowlevel_halt(void)
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{
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switch (music_playing->type) {
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#ifdef CMD_MUSIC
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case MUS_CMD:
MusicCMD_Stop(music_playing->data.cmd);
break;
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#endif
#ifdef WAV_MUSIC
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case MUS_WAV:
WAVStream_Stop();
break;
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#endif
#ifdef MOD_MUSIC
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case MUS_MOD:
Player_Stop();
break;
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#endif
#ifdef MID_MUSIC
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case MUS_MID:
Timidity_Stop();
break;
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#endif
#ifdef MP3_MUSIC
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case MUS_MP3:
SMPEG_stop(music_playing->data.mp3);
break;
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#endif
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default:
/* Unknown music type?? */
return;
}
if(music_playing->fading != MIX_NO_FADING) /* Restore volume */
music_volume = music_playing->fade_volume;
music_playing->fading = MIX_NO_FADING;
music_playing = 0;
music_active = 0;
music_stopped = 0;
}
/* Halt playing of music */
int Mix_HaltMusic(void)
{
if ( music_playing && !music_stopped ) {
/* Mark the music to be stopped from the sound thread */
music_stopped = 1;
/* Wait for it to be actually stopped */
while ( music_playing )
SDL_Delay(10);
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}
return(0);
}
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/* Progressively stop the music */
int Mix_FadeOutMusic(int ms)
{
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if ( music_playing && !music_stopped && music_playing->fading==MIX_NO_FADING ) {
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if ( music_volume>0 ) {
music_playing->fading = MIX_FADING_OUT;
music_playing->fade_volume = music_volume;
music_playing->fade_length = ms;
music_playing->ticks_fade = SDL_GetTicks();
return(1);
}
}
return(0);
}
Mix_Fading Mix_FadingMusic(void)
{
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if( music_playing && !music_stopped )
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return music_playing->fading;
return MIX_NO_FADING;
}
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/* Pause/Resume the music stream */
void Mix_PauseMusic(void)
{
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if ( music_playing && !music_stopped ) {
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switch ( music_playing->type ) {
#ifdef CMD_MUSIC
case MUS_CMD:
MusicCMD_Pause(music_playing->data.cmd);
break;
#endif
#ifdef MP3_MUSIC
case MUS_MP3:
SMPEG_pause(music_playing->data.mp3);
break;
#endif
}
}
music_active = 0;
}
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void Mix_ResumeMusic(void)
{
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if ( music_playing && !music_stopped ) {
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switch ( music_playing->type ) {
#ifdef CMD_MUSIC
case MUS_CMD:
MusicCMD_Resume(music_playing->data.cmd);
break;
#endif
#ifdef MP3_MUSIC
case MUS_MP3:
SMPEG_pause(music_playing->data.mp3);
break;
#endif
}
}
music_active = 1;
}
void Mix_RewindMusic(void)
{
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if ( music_playing && !music_stopped ) {
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switch ( music_playing->type ) {
#ifdef MP3_MUSIC
case MUS_MP3:
SMPEG_rewind(music_playing->data.mp3);
break;
#endif
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/* TODO: Implement this for other music backends */
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}
}
}
/* Check the status of the music */
int Mix_PlayingMusic(void)
{
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switch (music_playing->type) {
#ifdef CMD_MUSIC
case MUS_CMD:
if (!MusicCMD_Active(music_playing->data.cmd)) {
music_playing = 0;
}
break;
#endif
#ifdef WAV_MUSIC
case MUS_WAV:
if ( ! WAVStream_Active() ) {
music_playing = 0;
}
break;
#endif
#ifdef MOD_MUSIC
case MUS_MOD:
if ( ! Player_Active() ) {
music_playing = 0;
}
break;
#endif
#ifdef MID_MUSIC
case MUS_MID:
if ( ! Timidity_Active() ) {
music_playing = 0;
}
break;
#endif
#ifdef MP3_MUSIC
case MUS_MP3:
if(SMPEG_status(music_playing->data.mp3)!=SMPEG_PLAYING)
music_playing = 0;
break;
#endif
}
}
return(music_playing ? 1 : 0);
}
/* 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);
}
/* Uninitialize the music players */
void close_music(void)
{
Mix_HaltMusic();
#ifdef CMD_MUSIC
Mix_SetMusicCMD(NULL);
#endif
#ifdef MOD_MUSIC
MikMod_Exit();
#endif
}