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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);
- }
-