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// MODplay for the PS1
// Music Module Player
// Supports ProTracker (.mod) module format
// Requires libADPCM!
// If NO_PSX_LIB is defined, no parts using PSXSDK functions are compiled
// This is useful if you want to use the library to handle module files in tools
#ifndef NO_PSX_LIB
#include <psx.h>
#endif
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#ifndef NO_PSX_LIB
#include <adpcm.h>
#endif
#include "modplay.h"
#include "modplay_int.h"
// Configuration defines
// Size of ADPCM buffer used by MODUploadSamples when
// converting 8-bit unsigned PCM samples to PS1 ADPCM format
// By default it is set to 0x4000, 16 kilobytes
#define ADPCM_BUFFER_SIZE 0x4000
int modplay_base_voice = 0;
int modplay_max_vol = 0x3fff;
int modplay_chan_vols[8];
int modplay_int_cnt = 0;
int modplay_samples_off[32];
int modplay_chan_mask = 0;
int modplay_is_mono = 0;
unsigned char modplay_adpcm_buffer[ADPCM_BUFFER_SIZE];
unsigned int modload_flags = 0;
ModMusic *MODLoad(void *d)
{
return MODLoadEx(d, 0);
}
ModMusic *MODLoadEx(void *d, unsigned int flags)
{
modload_flags = flags;
// If the module file was in no other format, assume the module file is
// in ProTracker format. There's no real way to detect a ProTracker module
// file 100% correctly so this will do.
return MODLoad_MOD(d);
}
void MODUnload(ModMusic *m)
{
int x;
MODStop(m);
switch(m->fmt)
{
case MOD_FMT_MOD:
free(m->pattern_data);
for(x = 0; x < m->sample_num; x++)
{
if(m->sample[x].data != NULL)
free(m->sample[x].data);
}
free(m->sample);
free(m);
break;
}
}
#ifdef NO_PSX_LIB
void MODPlay_func(ModMusic *m, int c, int s, int p, int vl, int vr)
{
// Just a stub
}
#else
void MODPlay_func(ModMusic *m, int c, int s, int p, int vl, int vr)
{
int v = c + modplay_base_voice;
// static int mask = 0;
// if(s != -1)
// {
// SsKeyOff(v);
if(p != -1)
SsVoicePitch(v, p);
// }
if(modplay_max_vol != 0x3fff)
{
vl = (modplay_max_vol * vl) / 0x4000;
vr = (modplay_max_vol * vr) / 0x4000;
vl&=0x3fff;
vr&=0x3fff;
}
if(modplay_is_mono)
{
if(vl>vr)
vr=vl;
else
vl=vr;
}
SsVoiceVol(v, vl, vr);
if(s != -1)
{
if(modplay_samples_off[s] != -1)
{
SsVoiceStartAddr(v, modplay_samples_off[s]);
modplay_chan_mask|=(1<<v);
}
}
}
#endif
void MODPlay(ModMusic *m, int *t)
{
modplay_chan_mask = 0;
switch(m->fmt)
{
case MOD_FMT_MOD:
MODPlay_MOD(m, t);
break;
}
//printf("modplay_chan_mask = %d\n", modplay_chan_mask);
#ifndef NO_PSX_LIB
SsKeyOnMask(modplay_chan_mask);
#endif
}
void MODStop(ModMusic *m)
{
#ifndef NO_PSX_LIB
int mask = 0;
int x;
for(x = 0; x<m->channel_num; x++)
mask|=1<<(modplay_base_voice+x);
SsKeyOffMask(mask);
#endif
}
#ifndef NO_PSX_LIB
int MODUploadSamples(ModMusic *m, int base_addr)
{
int x, b;
if(base_addr == -1)
base_addr = SPU_DATA_BASE_ADDR;
modplay_samples_off[0] = base_addr;
for(x = 0; x < m->sample_num; x++)
{
b = SsAdpcmPack(m->sample[x].data, modplay_adpcm_buffer,
m->sample[x].length, FMT_U8, sizeof(modplay_adpcm_buffer), 0);
SsUpload(modplay_adpcm_buffer, b, modplay_samples_off[x]);
if(x!=30)
modplay_samples_off[x+1] = modplay_samples_off[x]+b;
}
return modplay_samples_off[x];
}
int MOD4PSX_Upload(void *d, int base_addr)
{
unsigned char *c = d;
int x;
int o;
int sz;
int n;
int smpOff;
// Check magic string
if(strncmp((char*)c, "_mod4psx", 8) != 0)
return -1;
o = 12;
n = *((int*)(c+8));
if(base_addr == -1)
smpOff = SPU_DATA_BASE_ADDR;
else
smpOff = base_addr;
//smpOff = modplay_samples_off[0];
printf("Number of samples: %d\n", n);
for(x = 0; x < n; x++)
{
// Get size
sz = *((int*)(c+o));
printf("Size: %d\n", sz);
// Ignore eight reserved bytes (for future expension)
o+=12;
if(sz > 0)
{
modplay_samples_off[x] = smpOff;
SsUpload(c+o, sz, modplay_samples_off[x]);
smpOff+=sz;
}
else
modplay_samples_off[x] = -1;
o += sz;
}
return modplay_samples_off[x];
}
#endif
void MODSetBaseVoice(int base_voice)
{
modplay_base_voice = base_voice;
}
void MODSetMaxVolume(unsigned short max_volume)
{
// Default is 0x3fff.
// Valid values 0 (MUTE) - 0x3FFF (MAX)
modplay_max_vol = max_volume & 0x3fff;
}
void MODRewind(ModMusic *m)
{
MODStop(m);
m->song_pos = 0;
m->pat_pos = 0;
if(m->fmt == MOD_FMT_MOD)
{
m->divisions_sec = 7;
m->beats_minute = 125;
m->ticks_division = 6;
}
}
void MODSetTranspose(ModMusic *m, short transpose)
{
m->transpose = transpose;
}
void MODSetMono(int value)
{
/* Sets mono audio mode
left volume = right volume */
modplay_is_mono = value;
}
#ifdef NO_PSX_LIB
// Some code might use this, so use a stub.
unsigned short SsFreqToPitch(int hz)
{
return 0;
}
#endif
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