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Gold Medal Software 2
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Gold Medal Software Volume 2 (Gold Medal) (1994).iso
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ptmid.arj
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PTMIDZAP.C
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C/C++ Source or Header
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1994-01-08
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/*
* ptmidzap.c: Resolution module for ptmid. Takes a structure representing
* a tune and tries to make it fit into 4 channels.
*
* Author: Andrew Scott (c)opyright 1994
*
* Date: 17/11/1993 ver 0.0
* 8/1/1994 ver 0.1
*/
#include <stdio.h>
#include <stdlib.h>
#include "ptmid.h"
MS rgmsDecided[MAXPTSAMPS];
int cmsDecided = 0, wVolfract = 1;
/**
** The midiperiod1 array allows quick conversion between MIDI note
** values and Protracker note values. The midiperiod2 array is
** similar, but uses an extended range of values. All "out-of-bounds"
** values are given closest legal value.
**/
unsigned midiperiod1[128] = {
856, 856, 856, 856, 856, 856, 856, 856, 856, 856, 856, 856,
856, 856, 856, 856, 856, 856, 856, 856, 856, 856, 856, 856,
856, 856, 856, 856, 856, 856, 856, 856, 856, 856, 856, 856,
856, 856, 856, 856, 856, 856, 856, 856, 856, 856, 856, 856,
856, 808, 762, 720, 678, 640, 604, 570, 538, 508, 480, 453,
428, 404, 381, 360, 339, 320, 302, 285, 269, 254, 240, 226,
214, 202, 190, 180, 170, 160, 151, 143, 135, 127, 120, 113,
113, 113, 113, 113, 113, 113, 113, 113, 113, 113, 113, 113,
113, 113, 113, 113, 113, 113, 113, 113, 113, 113, 113, 113,
113, 113, 113, 113, 113, 113, 113, 113, 113, 113, 113, 113,
113, 113, 113, 113, 113, 113, 113, 113
};
unsigned midiperiod2[128] = {
1712,1712,1712,1712,1712,1712,1712,1712,1712,1712,1712,1712,
1712,1712,1712,1712,1712,1712,1712,1712,1712,1712,1712,1712,
1712,1712,1712,1712,1712,1712,1712,1712,1712,1712,1712,1712,
1712,1616,1525,1440,1357,1281,1209,1141,1077,1017,961, 907,
856, 808, 762, 720, 678, 640, 604, 570, 538, 508, 480, 453,
428, 404, 381, 360, 339, 320, 302, 285, 269, 254, 240, 226,
214, 202, 190, 180, 170, 160, 151, 143, 135, 127, 120, 113,
107, 101, 95, 90, 85, 80, 76, 71, 67, 64, 60, 57,
57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57,
57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57, 57,
57, 57, 57, 57, 57, 57, 57, 57
};
/**
** The midivolume array does the same thing as the midiperiod array
** except it is for velocity-volume conversion.
**/
unsigned midivolume[128] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,
64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64
};
/*
* Init: Initializes stuff that should be initialized.
*/
static void Init()
{
int ims = MAXPTSAMPS;
while (ims--) { /** Put default values in sample array **/
sprintf(rgmsDecided[ims].szName, "%02d: --", ims);
rgmsDecided[ims].cMix = 0;
rgmsDecided[ims].bDefvol = 0;
}
}
/*
* FitSzBFn: Given a filename, will fit it into the given sample name,
* and prepend given number, ensuring that it doesn't overflow the
* 22 character array.
*/
void FitSzBFn(Sz szName, int bPos, Sz fnSample)
{
int iT = 18;
sprintf(szName, "%02d: ", bPos); /** First the number **/
szName += 4;
while (iT-- && (*(szName++) = *(fnSample++))); /** Then the name **/
}
/*
* AnalyzePtune: Given a tune, searches through and allocates samples
* to sample array rgmsDecided (includes determining mixes).
* Eventually (?) this will become much more extensive, and include
* compacting by changing tempo, filtering of quiet notes, and identification
* of common chords and replacing these with a separate sample.
*/
void AnalyzePtune(Tune *ptune)
{
unsigned long Lastnoise = 0;
EI *pei;
SI *psi, **ppsi;
NI *pni;
int ini;
while (NULL != ptune) { /** While not at end of tune **/
for (pei = ptune->pei; NULL != pei; pei = pei->peiNext) /** With each event **/
if (0 != pei->cni) {
if (ptune->count + pei->effect > Lastnoise) /** Find the note which **/
Lastnoise = ptune->count + pei->effect; /** will carry the longest **/
for (ini = pei->cni; ini--; ) { /** For each note in event **/
pni = pei->pni;
if (pni[ini].inst < 0) /** If a percussion instrument **/
if ((psi = rgpsiDrum[-1 - pni[ini].inst]) == NULL)
pni[ini].inst = -1;
else if (fExtend) /** convert pitch to protracker period **/
pni[ini].pitch = midiperiod2[psi->pitch];
else
pni[ini].pitch = midiperiod1[psi->pitch];
else { /** Else if a non-percussion instrument **/
unsigned wMin;
if ((ppsi = rgppsiIns[pni[ini].inst]) == NULL)
ppsi = rgppsiIns[128];
psi = *(ppsi++);
wMin = abs(psi->pitch - pni[ini].pitch);
for (; NULL != *ppsi; ppsi++) /** Find closest matching sample **/
if (abs((*ppsi)->pitch - pni[ini].pitch) < wMin) {
psi = *ppsi;
wMin = abs(psi->pitch - pni[ini].pitch);
}
wMin = 60 + pni[ini].pitch - psi->pitch;
if (fExtend) /** And use it's base note when converting to **/
pni[ini].pitch = midiperiod2[wMin]; /** protracker periods **/
else
pni[ini].pitch = midiperiod1[wMin];
}
if (NULL != psi) /** If sample info **/
if (-1 != psi->sample) /** and sample has been used before **/
pni[ini].inst = psi->sample; /** use that sample for instrument **/
else if (MAXPTSAMPS == cmsDecided) /** Else if no samples left **/
pni[ini].inst = -1; /** make note invalid **/
else { /** Else we've got a new sample **/
FitSzBFn(rgmsDecided[cmsDecided].szName, cmsDecided,
psi->fnSample); /** Fix up it's name **/
rgmsDecided[cmsDecided].bDefvol = 64;
rgmsDecided[cmsDecided].cMix = 1;
if ((ppsi = (SI **) malloc(sizeof(SI *))) == NULL) {
fprintf(stderr, "ptmid: Cannot allocate any more memory\n");
exit(1);
} /** Give it a spot in memory **/
*ppsi = psi;
rgmsDecided[cmsDecided].ppsiMix = ppsi; /** Put it in array **/
rgmsDecided[cmsDecided].pwMixnote = NULL;
psi->sample = pni[ini].inst = cmsDecided++;
}
}
}
ptune = ptune->ptune;
}
}
/*
* UnitifyPtune: Given a tune, will convert its volume into Protracker
* standard units, as well as convert lengths into division multiples.
*/
void UnitifyPtune(Tune *ptune)
{
EI *pei;
NI *pni;
int cni;
while (NULL != ptune) { /** While not end of tune **/
pei = ptune->pei;
ptune->count /= wQuant; /** Divide intervals by quantize amount **/
ptune = ptune->ptune;
while (NULL != pei) { /** Go through each event **/
if (pei->cni) {
pei->effect /= wQuant; /** Divide durations by quantize amount **/
/**
** When implemented, samples that are chords will have volumes
** smaller than other samples (ie. 3 notes in one sample has
** 1/3 volume for each note), so much divide all other volumes
** to even things out.
**/
for (cni = pei->cni, pni = pei->pni; cni--; pni++)
pni->vol = midivolume[pni->vol] / wVolfract;
}
pei = pei->peiNext;
}
}
}
/*
* ResolvePtune: Given a tune, goes through and finds out useful stuff
* about it for use in creating a MOD-file. Also trims off chords that
* are too big, notes that are too quiet, etc.
*/
void ResolvePtune(Tune *ptune)
{
Init();
AnalyzePtune(ptune);
UnitifyPtune(ptune);
}