music_modplug.c
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#ifdef MODPLUG_MUSIC
#include "music_modplug.h"
static int current_output_channels=0;
static int music_swap8=0;
static int music_swap16=0;
static ModPlug_Settings settings;
int modplug_init(SDL_AudioSpec *spec)
{
ModPlug_GetSettings(&settings);
settings.mFlags=MODPLUG_ENABLE_OVERSAMPLING;
current_output_channels=spec->channels;
settings.mChannels=spec->channels>1?2:1;
settings.mBits=spec->format&0xFF;
music_swap8 = 0;
music_swap16 = 0;
switch(spec->format)
{
case AUDIO_U8:
case AUDIO_S8: {
if ( spec->format == AUDIO_S8 ) {
music_swap8 = 1;
}
settings.mBits=8;
}
break;
case AUDIO_S16LSB:
case AUDIO_S16MSB: {
/* See if we need to correct MikMod mixing */
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
if ( spec->format == AUDIO_S16MSB ) {
#else
if ( spec->format == AUDIO_S16LSB ) {
#endif
music_swap16 = 1;
}
settings.mBits=16;
}
break;
default: {
Mix_SetError("Unknown hardware audio format");
return -1;
}
}
settings.mFrequency=spec->freq; /*TODO: limit to 11025, 22050, or 44100 ? */
settings.mResamplingMode=MODPLUG_RESAMPLE_FIR;
settings.mReverbDepth=0;
settings.mReverbDelay=100;
settings.mBassAmount=0;
settings.mBassRange=50;
settings.mSurroundDepth=0;
settings.mSurroundDelay=10;
settings.mLoopCount=0;
ModPlug_SetSettings(&settings);
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}
/* Uninitialize the music players */
void modplug_exit()
{
}
/* Set the volume for a modplug stream */
void modplug_setvolume(modplug_data *music, int volume)
{
ModPlug_SetMasterVolume(music->file, volume*4);
}
/* Load a modplug stream from an SDL_RWops object */
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modplug_data *modplug_new_RW(SDL_RWops *rw, int freerw)
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{
modplug_data *music=NULL;
long offset,sz;
char *buf=NULL;
offset = SDL_RWtell(rw);
SDL_RWseek(rw, 0, RW_SEEK_END);
sz = SDL_RWtell(rw)-offset;
SDL_RWseek(rw, offset, RW_SEEK_SET);
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buf=(char*)SDL_malloc(sz);
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if(SDL_RWread(rw, buf, sz, 1)==1)
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music=(modplug_data*)SDL_malloc(sizeof(modplug_data));
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if (music)
{
music->playing=0;
music->file=ModPlug_Load(buf,sz);
if(!music->file)
{
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SDL_free(music);
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music=NULL;
}
}
else
{
SDL_OutOfMemory();
}
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}
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SDL_free(buf);
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}
else
{
SDL_OutOfMemory();
}
if (freerw) {
SDL_RWclose(rw);
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}
return music;
}
/* Start playback of a given modplug stream */
void modplug_play(modplug_data *music)
{
ModPlug_Seek(music->file,0);
music->playing=1;
}
/* Return non-zero if a stream is currently playing */
int modplug_playing(modplug_data *music)
{
return music && music->playing;
}
/* Play some of a stream previously started with modplug_play() */
int modplug_playAudio(modplug_data *music, Uint8 *stream, int len)
{
if (current_output_channels > 2) {
int small_len = 2 * len / current_output_channels;
int i;
Uint8 *src, *dst;
i=ModPlug_Read(music->file, stream, small_len);
if(i<small_len)
{
memset(stream+i,0,small_len-i);
music->playing=0;
}
/* and extend to len by copying channels */
src = stream + small_len;
dst = stream + len;
switch (settings.mBits) {
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 {
int i=ModPlug_Read(music->file, stream, len);
if(i<len)
{
memset(stream+i,0,len-i);
music->playing=0;
}
}
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;
}
}
return 0;
}
/* Stop playback of a stream previously started with modplug_play() */
void modplug_stop(modplug_data *music)
{
music->playing=0;
}
/* Close the given modplug stream */
void modplug_delete(modplug_data *music)
{
ModPlug_Unload(music->file);
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SDL_free(music);
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}
/* Jump (seek) to a given position (time is in seconds) */
void modplug_jump_to_time(modplug_data *music, double time)
{
ModPlug_Seek(music->file,(int)(time*1000));
}
#endif