ref: 1d09da3a87e43eee7a345f970378c37312a71895
dir: /src/smp.c/
/* * June 30, 1992 * Copyright 1992 Leigh Smith And Sundry Contributors * This source code is freely redistributable and may be used for * any purpose. This copyright notice must be maintained. * Leigh Smith And Sundry Contributors are not responsible for * the consequences of using this software. */ /* * Sound Tools SampleVision file format driver. * Output is always in little-endian (80x86/VAX) order. * * Derived from: Sound Tools skeleton handler file. * * Add: Loop point verbose info. It's a start, anyway. */ #include "st.h" #include <string.h> #define NAMELEN 30 /* Size of Samplevision name */ #define COMMENTLEN 60 /* Size of Samplevision comment, not shared */ #define MIDI_UNITY 60 /* MIDI note number to play sample at unity */ /* The header preceeding the sample data */ struct smpheader { char Id[18]; /* File identifier */ char version[4]; /* File version */ char comments[COMMENTLEN]; /* User comments */ char name[NAMELEN + 1]; /* Sample Name, left justified */ }; #define HEADERSIZE (sizeof(struct smpheader) - 1) /* -1 for name's \0 */ /* Samplevision loop definition structure */ struct loop { ULONG start; /* Sample count into sample data, not byte count */ ULONG end; /* end point */ char type; /* 0 = loop off, 1 = forward, 2 = forw/back */ short count; /* No of times to loop */ }; /* Samplevision marker definition structure */ struct marker { char name[10]; /* Ascii Marker name */ ULONG position; /* Sample Number, not byte number */ }; /* The trailer following the sample data */ struct smptrailer { struct loop loops[8]; /* loops */ struct marker markers[8]; /* markers */ char MIDInote; /* for unity pitch playback */ ULONG rate; /* in hertz */ ULONG SMPTEoffset; /* in subframes - huh? */ ULONG CycleSize; /* sample count in one cycle of the */ /* sampled sound -1 if unknown */ }; /* Private data for SMP file */ typedef struct smpstuff { ULONG NoOfSamps; /* Sample data count in words */ /* comment memory resides in private data because it's small */ char comment[COMMENTLEN + NAMELEN + 3]; } *smp_t; char *SVmagic = "SOUND SAMPLE DATA ", *SVvers = "2.1 "; /* * Read the SampleVision trailer structure. * Returns 1 if everything was read ok, 0 if there was an error. */ static int readtrailer(ft, trailer) ft_t ft; struct smptrailer *trailer; { int i; rshort(ft); /* read reserved word */ for(i = 0; i < 8; i++) { /* read the 8 loops */ trailer->loops[i].start = rlong(ft); ft->loops[i].start = trailer->loops[i].start; trailer->loops[i].end = rlong(ft); ft->loops[i].length = trailer->loops[i].end - trailer->loops[i].start; trailer->loops[i].type = getc(ft->fp); ft->loops[i].type = trailer->loops[8].type; trailer->loops[i].count = rshort(ft); ft->loops[8].count = trailer->loops[8].count; } for(i = 0; i < 8; i++) { /* read the 8 markers */ if (fread(trailer->markers[i].name, 1, 10, ft->fp) != 10) return(0); trailer->markers[i].position = rlong(ft); } trailer->MIDInote = getc(ft->fp); trailer->rate = rlong(ft); trailer->SMPTEoffset = rlong(ft); trailer->CycleSize = rlong(ft); return(1); } /* * set the trailer data - loops and markers, to reasonably benign values */ void settrailer(ft, trailer, rate) ft_t ft; struct smptrailer *trailer; unsigned int rate; { int i; for(i = 0; i < 8; i++) { /* copy the 8 loops */ if (ft->loops[i].type != 0) { trailer->loops[i].start = ft->loops[i].start; /* to mark it as not set */ trailer->loops[i].end = ft->loops[i].start + ft->loops[i].length; trailer->loops[i].type = ft->loops[i].type; trailer->loops[i].count = ft->loops[i].count; } else { /* set first loop start as FFFFFFFF */ trailer->loops[i].start = ~0; /* to mark it as not set */ trailer->loops[i].end = 0; trailer->loops[i].type = 0; trailer->loops[i].count = 0; } } for(i = 0; i < 8; i++) { /* write the 8 markers */ strcpy(trailer->markers[i].name, " "); trailer->markers[i].position = ~0; } trailer->MIDInote = MIDI_UNITY; /* Unity play back */ trailer->rate = rate; trailer->SMPTEoffset = 0; trailer->CycleSize = -1; } /* * Write the SampleVision trailer structure. * Returns 1 if everything was written ok, 0 if there was an error. */ static int writetrailer(ft, trailer) ft_t ft; struct smptrailer *trailer; { int i; wshort(ft, 0); /* write the reserved word */ for(i = 0; i < 8; i++) { /* write the 8 loops */ wlong(ft, trailer->loops[i].start); wlong(ft, trailer->loops[i].end); putc(trailer->loops[i].type, ft->fp); wshort(ft, trailer->loops[i].count); } for(i = 0; i < 8; i++) { /* write the 8 markers */ if (fwrite(trailer->markers[i].name, 1, 10, ft->fp) != 10) return(0); wlong(ft, trailer->markers[i].position); } putc(trailer->MIDInote, ft->fp); wlong(ft, trailer->rate); wlong(ft, trailer->SMPTEoffset); wlong(ft, trailer->CycleSize); return(1); } /* * Do anything required before you start reading samples. * Read file header. * Find out sampling rate, * size and style of samples, * mono/stereo/quad. */ void smpstartread(ft) ft_t ft; { smp_t smp = (smp_t) ft->priv; int littlendian = 1; char *endptr; int i; int namelen, commentlen; LONG samplestart; struct smpheader header; struct smptrailer trailer; endptr = (char *) &littlendian; /* SMP is in Little Endian format. Swap whats read in on */ /* Big Endian machines. */ if (!*endptr) { ft->swap = ft->swap ? 0 : 1; } /* If you need to seek around the input file. */ if (! ft->seekable) fail("SMP input file must be a file, not a pipe"); /* Read SampleVision header */ if (fread((char *) &header, 1, HEADERSIZE, ft->fp) != HEADERSIZE) fail("unexpected EOF in SMP header"); if (strncmp(header.Id, SVmagic, 17) != 0) fail("SMP header does not begin with magic word %s\n", SVmagic); if (strncmp(header.version, SVvers, 4) != 0) fail("SMP header is not version %s\n", SVvers); /* Format the sample name and comments to a single comment */ /* string. We decrement the counters till we encounter non */ /* padding space chars, so the *lengths* are low by one */ for (namelen = NAMELEN-1; namelen >= 0 && header.name[namelen] == ' '; namelen--) ; for (commentlen = COMMENTLEN-1; commentlen >= 0 && header.comments[commentlen] == ' '; commentlen--) ; sprintf(smp->comment, "%.*s: %.*s", namelen+1, header.name, commentlen+1, header.comments); ft->comment = smp->comment; report("SampleVision file name and comments: %s", ft->comment); /* Extract out the sample size (always intel format) */ smp->NoOfSamps = rlong(ft); /* mark the start of the sample data */ samplestart = ftell(ft->fp); /* seek from the current position (the start of sample data) by */ /* NoOfSamps * 2 */ if (fseek(ft->fp, smp->NoOfSamps * 2L, 1) == -1) fail("SMP unable to seek to trailer"); if (!readtrailer(ft, &trailer)) fail("unexpected EOF in SMP trailer"); /* seek back to the beginning of the data */ if (fseek(ft->fp, samplestart, 0) == -1) fail("SMP unable to seek back to start of sample data"); ft->info.rate = (int) trailer.rate; ft->info.size = WORD; ft->info.style = SIGN2; ft->info.channels = 1; if (verbose) { fprintf(stderr, "SampleVision trailer:\n"); for(i = 0; i < 8; i++) if (1 || trailer.loops[i].count) { #ifdef __alpha__ fprintf(stderr, "Loop %d: start: %6d", i, trailer.loops[i].start); fprintf(stderr, " end: %6d", trailer.loops[i].end); #else fprintf(stderr, "Loop %d: start: %6ld", i, trailer.loops[i].start); fprintf(stderr, " end: %6ld", trailer.loops[i].end); #endif fprintf(stderr, " count: %6d", trailer.loops[i].count); fprintf(stderr, " type: "); switch(trailer.loops[i].type) { case 0: fprintf(stderr, "off\n"); break; case 1: fprintf(stderr, "forward\n"); break; case 2: fprintf(stderr, "forward/backward\n"); break; } } fprintf(stderr, "MIDI Note number: %d\n\n", trailer.MIDInote); } ft->instr.nloops = 0; for(i = 0; i < 8; i++) if (trailer.loops[i].type) ft->instr.nloops++; for(i = 0; i < ft->instr.nloops; i++) { ft->loops[i].type = trailer.loops[i].type; ft->loops[i].count = trailer.loops[i].count; ft->loops[i].start = trailer.loops[i].start; ft->loops[i].length = trailer.loops[i].end - trailer.loops[i].start; } ft->instr.MIDIlow = ft->instr.MIDIhi = ft->instr.MIDInote = trailer.MIDInote; if (ft->instr.nloops > 0) ft->instr.loopmode = LOOP_8; else ft->instr.loopmode = LOOP_NONE; } /* * Read up to len samples from file. * Convert to signed longs. * Place in buf[]. * Return number of samples read. */ LONG smpread(ft, buf, len) ft_t ft; LONG *buf, len; { smp_t smp = (smp_t) ft->priv; LONG datum; int done = 0; for(; done < len && smp->NoOfSamps; done++, smp->NoOfSamps--) { datum = rshort(ft); /* scale signed up to long's range */ *buf++ = LEFT(datum, 16); } return done; } /* * Do anything required when you stop reading samples. * Don't close input file! */ void smpstopread(ft) ft_t ft; { } void smpstartwrite(ft) ft_t ft; { int littlendian = 1; char *endptr; smp_t smp = (smp_t) ft->priv; struct smpheader header; endptr = (char *) &littlendian; /* SMP is in Little Endian format. Swap whats read in on */ /* Big Endian machines. */ if (!*endptr) { ft->swap = ft->swap ? 0 : 1; } /* If you have to seek around the output file */ if (! ft->seekable) fail("Output .smp file must be a file, not a pipe"); /* If your format specifies any of the following info. */ ft->info.size = WORD; ft->info.style = SIGN2; ft->info.channels = 1; strcpy(header.Id, SVmagic); strcpy(header.version, SVvers); sprintf(header.comments, "%-*s", COMMENTLEN, "Converted using Sox."); sprintf(header.name, "%-*.*s", NAMELEN, NAMELEN, ft->comment); /* Write file header */ if(fwrite(&header, 1, HEADERSIZE, ft->fp) != HEADERSIZE) fail("SMP: Can't write header completely"); wlong(ft, 0); /* write as zero length for now, update later */ smp->NoOfSamps = 0; } void smpwrite(ft, buf, len) ft_t ft; LONG *buf, len; { smp_t smp = (smp_t) ft->priv; register int datum; while(len--) { datum = (int) RIGHT(*buf++, 16); wshort(ft, datum); smp->NoOfSamps++; } /* If you cannot write out all of the supplied samples, */ /* fail("SMP: Can't write all samples to %s", ft->filename); */ } void smpstopwrite(ft) ft_t ft; { smp_t smp = (smp_t) ft->priv; struct smptrailer trailer; /* Assign the trailer data */ settrailer(ft, &trailer, ft->info.rate); writetrailer(ft, &trailer); if (fseek(ft->fp, 112, 0) == -1) fail("SMP unable to seek back to save size"); wlong(ft, smp->NoOfSamps); }