/* * 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 #include #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); }