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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;
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static int music_volume = MIX_MAX_VOLUME;
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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;
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int fade_step;
int fade_steps;
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int error;
};
static int timidity_ok;
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/* Used to calculate fading steps */
static int ms_per_step;
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/* Local low-level functions prototypes */
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static void lowlevel_halt(void);
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static int lowlevel_play(Mix_Music *music);
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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;
}
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/* Handle fading */
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if ( music_playing->fading != MIX_NO_FADING ) {
if ( music_playing->fade_step++ < music_playing->fade_steps ) {
int fade_volume = music_playing->fade_volume;
int fade_step = music_playing->fade_step;
int fade_steps = music_playing->fade_steps;
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if ( music_playing->fading == MIX_FADING_OUT ) {
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Mix_VolumeMusic((fade_volume * (fade_steps-fade_step))
/ fade_steps);
} else { /* Fading in */
Mix_VolumeMusic((fade_volume * fade_step) / fade_steps);
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}
} else {
if ( music_playing->fading == MIX_FADING_OUT ) {
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lowlevel_halt();
return;
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}
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music_playing->fading = MIX_NO_FADING;
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}
}
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/* Restart music if it has to loop */
if ( music_loops && !Mix_PlayingMusic() ) {
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if ( -- music_loops ) {
Mix_RewindMusic();
if ( lowlevel_play(music_playing) < 0 ) {
fprintf(stderr,"Warning: Music restart failed.\n");
music_stopped = 1; /* Something went wrong */
music_playing->fading = MIX_NO_FADING;
}
}
}
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if ( music_volume <= 0 ) { /* Don't mix if volume is null */
return;
}
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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);
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/* Calculate the number of ms for each callback */
ms_per_step = ((float)mixer->samples * 1000.0) / mixer->freq;
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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 */
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while ( music_playing && !music_stopped && (music_playing->fading == MIX_FADING_OUT) )
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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);
}
}
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static int lowlevel_play(Mix_Music *music)
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{
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if(!music)
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return(-1);
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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_play(music->data.mp3);
break;
#endif
default:
/* Unknown music type?? */
return(-1);
}
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return(0);
}
/* 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);
}
/* If the current music is fading out, wait for the fade to complete */
while ( music_playing && !music_stopped && music_playing->fading==MIX_FADING_OUT ) {
SDL_Delay(100);
}
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if ( lowlevel_play(music) < 0 ) {
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return(-1);
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}
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music_active = 1;
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music_stopped = 0;
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music_loops = loops;
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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;
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if ( Mix_PlayMusic(music, loops) < 0 ) {
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return(-1);
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}
music_playing->fade_step = 0;
music_playing->fade_steps = ms/ms_per_step;
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music_playing->fading = MIX_FADING_IN;
}
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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;
}
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if ( music_playing->fading != MIX_NO_FADING ) /* Restore volume */
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music_volume = music_playing->fade_volume;
music_playing->fading = MIX_NO_FADING;
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music_playing = NULL;
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music_active = 0;
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music_loops = 0;
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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) ) {
if ( music_volume > 0 ) {
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music_playing->fading = MIX_FADING_OUT;
music_playing->fade_volume = music_volume;
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music_playing->fade_step = 0;
music_playing->fade_steps = ms/ms_per_step;
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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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music_active = 0;
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}
}
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void Mix_ResumeMusic(void)
{
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if ( music_playing && !music_stopped ) {
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music_active = 1;
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}
}
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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}
}
}
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int Mix_PausedMusic(void)
{
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return (music_active == 0);
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}
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/* Check the status of the music */
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int Mix_PlayingMusic(void)
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{
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if ( music_playing && ! music_stopped ) {
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switch (music_playing->type) {
#ifdef CMD_MUSIC
case MUS_CMD:
if (!MusicCMD_Active(music_playing->data.cmd)) {
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return(0);
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}
break;
#endif
#ifdef WAV_MUSIC
case MUS_WAV:
if ( ! WAVStream_Active() ) {
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return(0);
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}
break;
#endif
#ifdef MOD_MUSIC
case MUS_MOD:
if ( ! Player_Active() ) {
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return(0);
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}
break;
#endif
#ifdef MID_MUSIC
case MUS_MID:
if ( ! Timidity_Active() ) {
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return(0);
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720
721
722
}
break;
#endif
#ifdef MP3_MUSIC
case MUS_MP3:
if(SMPEG_status(music_playing->data.mp3)!=SMPEG_PLAYING)
723
return(0);
724
725
726
break;
#endif
}
727
728
return(1);
}
729
return(0);
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
}
/* 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
}