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- /*
- * ptmidsav.c: MOD-format saver module for ptmid. Takes a structure
- * representing a tune and creates a file which contains that tune.
- *
- * 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 <string.h>
- #include "ptmid.h"
-
- /*
- * PutblanksPfile: Outputs as many null characters to a given file as
- * is desired (max. 131). Inelegant solution.
- */
- void PutblanksPfile(FILE *pfile, int cch)
- {
- if (cch)
- fwrite("\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
- "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
- "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
- "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
- "\0\0", 1, cch, pfile);
- }
-
- /*
- * PutPfileSz: Outputs a string to a given file and pads it to the correct
- * length by outputting null characters if necessary.
- */
- void PutPfileSz(FILE *pfile, Sz szT, int cch)
- {
- while (*szT && cch) {
- putc(*(szT++), pfile);
- cch--;
- }
- PutblanksPfile(pfile, cch);
- }
-
- /*
- * WritePfile: Writes division information (sample, period, effect) to
- * given file in the standard Protracker format.
- */
- void WritePfile(FILE *pfile, unsigned bSam, unsigned wPer, unsigned wEff)
- {
- putc((bSam & 0xF0) | (wPer >> 8), pfile);
- putc(wPer & 0xFF, pfile);
- putc((bSam & 0x0F) << 4 | (wEff >> 8), pfile);
- putc(wEff & 0xFF, pfile);
- }
-
- /*
- * PeiNextPtune: Given a pointer to a tune, will start using it if not
- * already using one. Will return next event in quanta, else NULL.
- * If it gets to the end of the tune, will set flag to false and will
- * wait to be given a new tune.
- */
- EI *PeiNextPtune(Tune *ptuneMain, int *pf)
- {
- static Tune *ptune = NULL;
- static unsigned long quant;
- EI *pei;
-
- if (NULL == ptune) { /** If first time called **/
- if (NULL == ptuneMain) /** If no tune given, quit **/
- return NULL;
- *pf = 1;
- quant = 0;
- ptune = ptuneMain; /** Initialize tune pointer to start of tune **/
- } else /** Else **/
- quant++; /** Advance along tune 1 quantize fraction **/
- if (quant < ptune->count) /** If haven't reached next event **/
- return NULL; /** return nothing-happening **/
-
- pei = ptune->pei; /** Otherwise note next event **/
- if ((ptune = ptune->ptune) == NULL) /** If no more events **/
- *pf = 0; /** register end of tune **/
- return pei; /** Return that event **/
- }
-
- /*
- * Convqpm: Converts a given qpm number into a double tempo thingy.
- */
- void Convqpm(unsigned qpm, int rgbTempo[2], int ticks)
- {
- if (792 / ticks <= qpm && 6144 / ticks - 1 >= qpm) {
- rgbTempo[0] = ticks; /** If can use current ticks/div, do so **/
- rgbTempo[1] = qpm * ticks / 24;
- } else if (33 > qpm) /** Else if qpm is very small **/
- if (26 > qpm) { /** approximate it **/
- rgbTempo[0] = 31;
- rgbTempo[1] = 33;
- } else {
- rgbTempo[0] = 31;
- rgbTempo[1] = qpm * 31 / 24;
- }
- else if (6120 <= qpm) { /** Else if qpm is very big **/
- rgbTempo[0] = 1; /** approximate it too **/
- rgbTempo[1] = 255;
- } else { /** Else look for closest fraction **/
- unsigned iT;
-
- iT = (qpm + 254) / 255; /**### try best fit fraction later ###**/
- rgbTempo[0] = 24 / iT;
- rgbTempo[1] = qpm / iT;
- }
- }
-
- /*
- * PutpatternsPtunePfile: Given an output file and a tune, will output the
- * tune as standard Protracker patterns. wPtchan determines number of
- * channels per division. wPatmax determines maximum number of patterns
- * to write before terminating.
- */
- int PutpatternsPtunePfile(Tune *ptune, FILE *pfile)
- {
- int iT, iT2, wPat = 0, cDiv, ipw, ipwMax, fGoing, ini;
- unsigned pwLen[MAXPTCHAN] = {0,0,0,0,0,0,0,0}, pwNote[3 * MAXPTCHAN];
- unsigned rgbTempo[2] = {6,125};
- long wNewtempo = 120;
- EI *pei;
- NI *pni;
-
- pei = PeiNextPtune(ptune, &fGoing); /** Get first event **/
- ipw = wPtchan;
- ipwMax = wPtchan * 3;
- for (wPat = 0; fGoing; wPat++) { /** Loop until told to stop **/
- if (wPat == wPatmax) { /** If pattern limit reached, stop **/
- fprintf(stderr, "ptmid: Warning -- Pattern limit %d reached. "
- "Aborting!\n", wPatmax);
- break;
- }
- for (cDiv = 64; cDiv--; ) { /** For each division in a pattern **/
- memset(pwNote, 0, ipwMax * sizeof(unsigned)); /** Clear next notes **/
-
- for (iT = wPtchan; iT--; ) /** With any currently playing notes **/
- if (pwLen[iT])
- if (0 == --pwLen[iT]) { /** Check if just stopped **/
- pwNote[iT2 = iT * 3] = MAXPTSAMPS; /** Yes.. store quiet command **/
- pwNote[iT2 + 1] = 0;
- pwNote[iT2 + 2] = 0xC00;
- }
-
- if (fGoing) { /** If still going in the tune **/
- for (; NULL != pei; pei = pei->peiNext) /** For each event at this position **/
- if (pei->cni) { /** If note-event **/
- pni = pei->pni;
- for (ini = pei->cni; ini--; ) /** For each note **/
- if (-1 != pni[ini].inst) { /** which is valid **/
-
- iT = ipwMax - 1; /*** Find channel to stick note ***/
- for (; 0 < iT && 0xC00 != pwNote[iT]; iT -= 3);
- if (0 > iT) {
- for (iT = ipw; iT--; )
- if (0 == pwLen[iT])
- break;
- if (0 > iT) {
- for (iT = wPtchan; iT-- > ipw; )
- if (0 == pwLen[iT])
- break;
- if (0 > iT) {
- iT2 = pei->effect / 2;
- for (iT = ipw; iT--; )
- if (iT2 <= pwLen[iT])
- break;
- if (0 > iT) {
- for (iT = wPtchan; iT-- > ipw; )
- if (iT2 <= pwLen[iT])
- break;
- if (0 > iT)
- continue;
- }
- }
- }
- if (--ipw < 0)
- ipw = wPtchan - 1;
- iT = iT * 3 + 2;
- }
-
- pwNote[iT - 2] = pni[ini].inst + 1; /*** Store note ***/
- pwNote[iT - 1] = pni[ini].pitch;
- if (pni[ini].vol != rgmsDecided[pni[ini].inst].bDefvol)
- pwNote[iT] = 0xC00 + pni[ini].vol;
- else
- pwNote[iT] = 0;
- pwLen[iT / 3] = pei->effect;
- }
-
- } else /** Else store new tempo **/
- wNewtempo = pei->effect;
- pei = PeiNextPtune(NULL, &fGoing);
- }
-
- if (0 != wNewtempo) { /** If need to set a tempo this division **/
- int rgbNew[2];
-
- Convqpm(wNewtempo, rgbNew, rgbTempo[0]); /** Find protracker equivalent **/
- if (rgbNew[0] != rgbTempo[0] || rgbNew[1] != rgbTempo[1]) {
- for (iT = ipwMax - 1; iT > 0; iT -= 3) /** Find a channel for it **/
- if (0 == pwNote[iT])
- break;
- if (iT < 0) { /** If no channel.. damn. Have to replace something **/
- unsigned bMin = -1, bTest;
-
- for (iT2 = ipwMax - 1; iT2 > 0; iT2 -= 3) {
- bTest = abs((pwNote[iT2] & 0xFF) - rgmsDecided[pwNote[iT2 - 2] - 1].bDefvol);
- if (bTest < bMin) {
- bMin = bTest;
- iT = iT2; /** Find best thing to replace **/
- }
- }
- }
-
- if (rgbNew[0] != rgbTempo[0])
- if (rgbNew[1] != rgbTempo[1]) { /** If need two places **/
- pwNote[iT] = 0xFFF;
- for (iT2 = ipwMax - 1; iT2 > 0; iT2 -= 3) /** Find a channel **/
- if (0 == pwNote[iT2])
- break;
- if (iT2 < 0) { /** No channels.. use different new tempo **/
- iT2 = rgbNew[1] * rgbTempo[0] / rgbNew[0];
- if (255 < iT2)
- if (280 < iT2)
- iT2 = 0;
- else
- iT2 = 255;
- else if (33 > iT2)
- if (30 > iT2)
- iT2 = 33;
- else
- iT2 = 0;
- if (0 != iT2) { /** If we can allow for ~10% bpm variance **/
- pwNote[iT] = 0xF00 + iT2; /** then use it **/
- rgbTempo[1] = iT2;
- } else { /** Else try to find a ticks value **/
- iT2 = rgbNew[0] * rgbTempo[1] / rgbNew[1];
- if (0 == iT2)
- iT2 = 1;
- else if (32 < iT2)
- iT2 = 32;
- pwNote[iT] = 0xF00 + iT2; /** and use it **/
- rgbTempo[0] = iT2;
- }
- } else {
- pwNote[iT] = 0xF00 + rgbNew[0]; /** Store 2 value tempo **/
- rgbTempo[0] = rgbNew[0];
- pwNote[iT2] = 0xF00 + rgbNew[1];
- rgbTempo[1] = rgbNew[1];
- }
- } else {
- pwNote[iT] = 0xF00 + rgbNew[0]; /** Store just ticks/div **/
- rgbTempo[0] = rgbNew[0];
- }
- else {
- pwNote[iT] = 0xF00 + rgbNew[1]; /** Store just bpm **/
- rgbTempo[1] = rgbNew[1];
- }
- }
- wNewtempo = 0;
- }
-
- for (iT = ipwMax - 1; iT > 0; iT -= 3) /** Write division to file **/
- WritePfile(pfile, pwNote[iT - 2], pwNote[iT - 1], pwNote[iT]);
- }
- }
- return wPat; /** Return number of patterns written **/
- }
-
- /*
- * SavePtunePfile: Given an output file and a tune, will output the tune to
- * the file using standard Protracker MODule format.
- */
- void SavePtunePfile(Tune *ptune, FILE *pfile)
- {
- int iT, cPatterns, ch, cSamps = 0;
- long Patternpos, Samplepos, cch;
- SI **ppsi;
- FILE *pfileSamp;
- char *pch;
-
- PutPfileSz(pfile, szTitle, 20); /** Write title **/
- for (iT = 0; iT < MAXPTSAMPS; iT++) { /** Write sample info **/
- PutPfileSz(pfile, rgmsDecided[iT].szName, 22);
- if (0 == rgmsDecided[iT].cMix)
- PutblanksPfile(pfile, 8);
- else {
- cSamps++;
- putw(0, pfile);
- putc(0, pfile);
- putc(rgmsDecided[iT].bDefvol, pfile);
- ppsi = rgmsDecided[iT].ppsiMix;
- putc((*ppsi)->wLppos >> 8, pfile);
- putc((*ppsi)->wLppos & 0xFF, pfile);
- putc((*ppsi)->wLplen >> 8, pfile);
- putc((*ppsi)->wLplen & 0xFF, pfile);
- }
- }
-
- Patternpos = ftell(pfile); /** Store start of pattern # table **/
- PutblanksPfile(pfile, 130); /** Write it as blanks **/
- fwrite(szId, 4, 1, pfile); /** Write protracker id **/
-
- cPatterns = PutpatternsPtunePfile(ptune, pfile); /** Write patterns **/
-
- Samplepos = ftell(pfile); /** Store start of samples data **/
- fseek(pfile, Patternpos, SEEK_SET); /** Go back to pattern # table **/
-
- putc(cPatterns, pfile);
- putc(127, pfile);
- for (iT = 0; iT < cPatterns; ) /** Write pattern numbers **/
- putc(iT++, pfile);
-
- pch = (char *) malloc(512);
- if (!fQuiet)
- printf("Writing %d samples: ", cSamps);
- for (iT = 0; iT < MAXPTSAMPS; iT++) /** Write samples **/
- if (0 < rgmsDecided[iT].cMix) {
- fseek(pfile, Samplepos, SEEK_SET);
- ppsi = rgmsDecided[iT].ppsiMix;
- pfileSamp = fopen((*ppsi)->fnSample, "rb");
- if (NULL == pch)
- while ((ch = getc(pfileSamp)) != EOF)
- putc(ch, pfile);
- else
- while (fwrite(pch, 1, fread(pch, 1, 512, pfileSamp), pfile) == 512);
- cch = ftell(pfileSamp) / 2;
- fclose(pfileSamp);
- Samplepos = ftell(pfile);
- fseek(pfile, 42 + 30 * iT, SEEK_SET);
- putc(cch >> 8, pfile);
- putc(cch & 0xFF, pfile);
- if (!fQuiet)
- printf(".");
- }
- if (!fQuiet)
- printf("\n");
-
- if (NULL != pch)
- free(pch);
- }
-