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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*/
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#include <stdlib.h>
#include <string.h>
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#include "SDL_endian.h"
#include "SDL_audio.h"
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#include "SDL_timer.h"
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#include "SDL_mixer.h"
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/* 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
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# 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)
# 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
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#endif
#ifdef MID_MUSIC
#include "timidity.h"
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#ifdef USE_NATIVE_MIDI
#include "native_midi.h"
#endif
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#endif
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#ifdef OGG_MUSIC
#include "music_ogg.h"
#endif
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#ifdef MP3_MUSIC
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#include "smpeg.h"
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static SDL_AudioSpec used_mixer;
#endif
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int volatile music_active = 1;
static int volatile music_stopped = 0;
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static int music_loops = 0;
static char *music_cmd = NULL;
static int samplesize;
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static Mix_Music * volatile music_playing = NULL;
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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,
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MUS_OGG,
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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;
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#ifdef USE_NATIVE_MIDI
NativeMidiSong *nativemidi;
#endif
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#endif
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#ifdef OGG_MUSIC
OGG_music *ogg;
#endif
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#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;
};
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#ifdef MID_MUSIC
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static int timidity_ok;
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#ifdef USE_NATIVE_MIDI
static int native_midi_ok;
#endif
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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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/* 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();
}
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/* Mixing function */
void music_mixer(void *udata, Uint8 *stream, int len)
{
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 ) {
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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))
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/ 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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music_playing->fading = MIX_NO_FADING;
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/* Restart music if it has to loop */
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if ( !Mix_PlayingMusic() ) {
/* Restart music if it has to loop */
if ( music_loops && --music_loops ) {
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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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else if (music_finished_hook) {
lowlevel_halt();
music_finished_hook();
return;
}
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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:
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WAVStream_PlaySome(stream, len);
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break;
#endif
#ifdef MOD_MUSIC
case MUS_MOD:
VC_WriteBytes((SBYTE *)stream, len);
if ( music_swap8 ) {
Uint8 *dst;
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dst = stream;
for ( i=len; i; --i ) {
*dst++ ^= 0x80;
}
} else
if ( music_swap16 ) {
Uint8 *dst, tmp;
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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:
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if ( timidity_ok ) {
int samples = len / samplesize;
Timidity_PlaySome(stream, samples);
}
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break;
#endif
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#ifdef OGG_MUSIC
case MUS_OGG:
OGG_playAudio(music_playing->data.ogg, stream, len);
break;
#endif
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#ifdef MP3_MUSIC
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case MUS_MP3:
SMPEG_playAudio(music_playing->data.mp3, stream, len);
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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: {
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Mix_SetError("Unknown hardware audio format");
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++music_error;
}
}
if ( mixer->channels > 1 ) {
if ( mixer->channels > 2 ) {
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Mix_SetError("Hardware uses more channels than mixer");
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++music_error;
}
md_mode |= DMODE_STEREO;
}
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samplesize = mixer->size/mixer->samples;
md_mixfreq = mixer->freq;
md_device = 0;
md_volume = 96;
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md_musicvolume = 128;
md_sndfxvolume = 128;
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md_pansep = 128;
md_reverb = 0;
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MikMod_RegisterAllLoaders();
MikMod_RegisterAllDrivers();
if ( MikMod_Init() ) {
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Mix_SetError("%s", MikMod_strerror(MikMod_errno));
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++music_error;
}
#endif
#ifdef MID_MUSIC
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samplesize = mixer->size/mixer->samples;
#ifdef USE_NATIVE_MIDI
if ( native_midi_init() ) {
native_midi_ok = 1;
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} else {
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native_midi_ok = 0;
}
timidity_ok = !native_midi_ok;
#else
timidity_ok = 1;
#endif
if ( timidity_ok &&
(Timidity_Init(mixer->freq, mixer->format,
mixer->channels, mixer->samples) != 0) ) {
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timidity_ok = 0;
}
#endif
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#ifdef OGG_MUSIC
if ( OGG_init(mixer) < 0 ) {
++music_error;
}
#endif
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#ifdef MP3_MUSIC
/* Keep a copy of the mixer */
used_mixer = *mixer;
#endif
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music_playing = NULL;
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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 */
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ms_per_step = (int) (((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;
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Uint8 magic[5];
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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);
}
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Mix_SetError("Couldn't read from '%s'", file);
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return(NULL);
}
magic[4] = '\0';
fclose(fp);
/* Allocate memory for the music structure */
music = (Mix_Music *)malloc(sizeof(Mix_Music));
if ( music == NULL ) {
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Mix_SetError("Out of memory");
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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"
*/
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if ( (strcmp((char *)magic, "RIFF") == 0) ||
(strcmp((char *)magic, "FORM") == 0) ) {
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music->type = MUS_WAV;
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music->data.wave = WAVStream_LoadSong(file, (char *)magic);
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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;
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#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;
}
} else
#endif
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if ( timidity_ok ) {
music->data.midi = Timidity_LoadSong((char *)file);
if ( music->data.midi == NULL ) {
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Mix_SetError("%s", Timidity_Error());
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music->error = 1;
}
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} else {
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Mix_SetError("%s", Timidity_Error());
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music->error = 1;
}
} else
#endif
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#ifdef OGG_MUSIC
/* Ogg Vorbis files have the magic four bytes "OggS" */
if ( strcmp(magic, "OggS") == 0 ) {
music->type = MUS_OGG;
music->data.ogg = OGG_new(file);
if ( music->data.ogg == NULL ) {
music->error = 1;
}
} else
#endif
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#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){
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Mix_SetError("MPEG file does not have any audio stream.");
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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 ) {
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Mix_SetError("%s", MikMod_strerror(MikMod_errno));
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music->error = 1;
}
} else
#endif
{
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Mix_SetError("Unrecognized music format");
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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:
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#ifdef USE_NATIVE_MIDI
if ( native_midi_ok ) {
native_midi_freesong(music->data.nativemidi);
} else
#endif
if ( timidity_ok ) {
Timidity_FreeSong(music->data.midi);
}
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break;
#endif
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#ifdef OGG_MUSIC
case MUS_OGG:
OGG_delete(music->data.ogg);
break;
#endif
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#ifdef MP3_MUSIC
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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:
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Player_SetVolume((SWORD)music_volume);
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Player_Start(music->data.module);
Player_SetPosition(0);
break;
#endif
#ifdef MID_MUSIC
case MUS_MID:
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#ifdef USE_NATIVE_MIDI
if ( native_midi_ok ) {
native_midi_setvolume(music_volume);
native_midi_start(music->data.nativemidi);
} else
#endif
if ( timidity_ok ) {
Timidity_SetVolume(music_volume);
Timidity_Start(music->data.midi);
}
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break;
#endif
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#ifdef OGG_MUSIC
case MUS_OGG:
OGG_setvolume(music->data.ogg, music_volume);
OGG_play(music->data.ogg);
break;
#endif
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#ifdef MP3_MUSIC
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SMPEG_enableaudio(music->data.mp3,1);
SMPEG_enablevideo(music->data.mp3,0);
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SMPEG_setvolume(music->data.mp3,(int)(((float)music_volume/(float)MIX_MAX_VOLUME)*100.0));
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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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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:
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Player_SetVolume((SWORD)music_volume);
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#endif
#ifdef MID_MUSIC
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case MUS_MID:
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#ifdef USE_NATIVE_MIDI
if ( native_midi_ok ) {
native_midi_setvolume(music_volume);
} else
#endif
if ( timidity_ok ) {
Timidity_SetVolume(music_volume);
}
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#endif
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#ifdef OGG_MUSIC
case MUS_OGG:
OGG_setvolume(music_playing->data.ogg, music_volume);
break;
#endif
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#ifdef MP3_MUSIC
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case MUS_MP3:
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SMPEG_setvolume(music_playing->data.mp3,(int)(((float)music_volume/(float)MIX_MAX_VOLUME)*100.0));
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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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712
#endif
#ifdef WAV_MUSIC
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714
715
case MUS_WAV:
WAVStream_Stop();
break;
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717
#endif
#ifdef MOD_MUSIC
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719
720
case MUS_MOD:
Player_Stop();
break;
721
722
#endif
#ifdef MID_MUSIC
723
case MUS_MID:
724
725
726
727
728
729
730
731
#ifdef USE_NATIVE_MIDI
if ( native_midi_ok ) {
native_midi_stop();
} else
#endif
if ( timidity_ok ) {
Timidity_Stop();
}
732
break;
733
#endif
734
735
736
737
738
#ifdef OGG_MUSIC
case MUS_OGG:
OGG_stop(music_playing->data.ogg);
break;
#endif
739
#ifdef MP3_MUSIC
740
741
742
case MUS_MP3:
SMPEG_stop(music_playing->data.mp3);
break;
743
#endif
744
745
746
747
default:
/* Unknown music type?? */
return;
}
748
if ( music_playing->fading != MIX_NO_FADING ) /* Restore volume */
749
750
music_volume = music_playing->fade_volume;
music_playing->fading = MIX_NO_FADING;
751
music_playing = NULL;
752
music_active = 0;
753
music_loops = 0;
754
755
756
757
758
759
760
761
762
763
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 */
764
while ( music_playing && music_active )
765
SDL_Delay(10);
766
767
768
769
}
return(0);
}
770
771
772
/* Progressively stop the music */
int Mix_FadeOutMusic(int ms)
{
773
774
if ( music_playing && !music_stopped &&
(music_playing->fading == MIX_NO_FADING) ) {
775
if ( music_volume > 0 ) {
776
777
music_playing->fading = MIX_FADING_OUT;
music_playing->fade_volume = music_volume;
778
779
music_playing->fade_step = 0;
music_playing->fade_steps = ms/ms_per_step;
780
781
782
783
784
785
786
787
return(1);
}
}
return(0);
}
Mix_Fading Mix_FadingMusic(void)
{
788
if( music_playing && !music_stopped )
789
790
791
792
return music_playing->fading;
return MIX_NO_FADING;
}
793
794
795
/* Pause/Resume the music stream */
void Mix_PauseMusic(void)
{
796
if ( music_playing && !music_stopped ) {
797
music_active = 0;
798
799
}
}
801
802
void Mix_ResumeMusic(void)
{
803
if ( music_playing && !music_stopped ) {
804
music_active = 1;
805
806
807
808
809
}
}
void Mix_RewindMusic(void)
{
810
if ( music_playing && !music_stopped ) {
811
switch ( music_playing->type ) {
812
813
814
815
816
817
#ifdef MOD_MUSIC
case MUS_MOD:
Player_Start(music_playing->data.module);
Player_SetPosition(0);
break;
#endif
818
819
820
821
#ifdef MP3_MUSIC
case MUS_MP3:
SMPEG_rewind(music_playing->data.mp3);
break;
822
823
824
825
826
827
828
829
830
#endif
#ifdef MID_MUSIC
case MUS_MID:
#ifdef USE_NATIVE_MIDI
if ( native_midi_ok ) {
native_midi_stop();
}
#endif
break;
831
#endif
832
default:
833
/* TODO: Implement this for other music backends */
835
836
837
838
}
}
}
839
840
int Mix_PausedMusic(void)
{
841
return (music_active == 0);
844
/* Check the status of the music */
845
int Mix_PlayingMusic(void)
846
{
847
if ( music_playing && ! music_stopped ) {
848
849
850
851
switch (music_playing->type) {
#ifdef CMD_MUSIC
case MUS_CMD:
if (!MusicCMD_Active(music_playing->data.cmd)) {
852
return(0);
853
854
855
856
857
}
break;
#endif
#ifdef WAV_MUSIC
case MUS_WAV:
858
if ( ! WAVStream_Active() ) {
859
return(0);
860
861
862
863
864
865
}
break;
#endif
#ifdef MOD_MUSIC
case MUS_MOD:
if ( ! Player_Active() ) {
866
return(0);
867
868
869
870
871
}
break;
#endif
#ifdef MID_MUSIC
case MUS_MID:
872
873
874
875
876
877
878
879
880
#ifdef USE_NATIVE_MIDI
if ( native_midi_ok ) {
if ( ! native_midi_active() )
return(0);
} else
#endif
if ( timidity_ok ) {
if ( ! Timidity_Active() )
return(0);
881
882
883
}
break;
#endif
884
885
886
887
888
889
890
#ifdef OGG_MUSIC
case MUS_OGG:
if ( ! OGG_playing(music_playing->data.ogg) ) {
return(0);
}
break;
#endif
891
892
#ifdef MP3_MUSIC
case MUS_MP3:
893
if ( SMPEG_status(music_playing->data.mp3) != SMPEG_PLAYING )
894
return(0);
895
896
break;
#endif
897
898
default:
break;
899
}
900
901
return(1);
}
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
}
/* 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();
932
933
MikMod_UnregisterAllLoaders();
MikMod_UnregisterAllDrivers();
934
935
#endif
}