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- /*
- * July 5, 1991
- * Copyright 1991 Lance Norskog And Sundry Contributors
- * This source code is freely redistributable and may be used for
- * any purpose. This copyright notice must be maintained.
- * Lance Norskog And Sundry Contributors are not responsible for
- * the consequences of using this software.
- */
-
- /*
- * Sound Tools MAUD file format driver, by Lutz Vieweg 1993
- *
- * supports: mono and stereo, linear, a-law and u-law reading and writing
- *
- * March 3, 1999 - cbagwell
- * Changed to use rawread for reading.
- *
- */
-
- #include "st.h"
- #include "libst.h"
- #include <string.h>
- #include <stdlib.h>
- #include <stdio.h>
-
- #ifdef HAVE_UNISTD_H
- #include <unistd.h> /* For SEEK_* defines if not found in stdio */
- #endif
-
- /* Private data for MAUD file */
- struct maudstuff { /* max. 100 bytes!!!! */
- ULONG nsamples;
- };
-
- void maudwriteheader(P1(ft_t));
- LONG rawread(P3(ft_t, LONG *, LONG));
- void rawwrite(P3(ft_t, LONG *, LONG));
-
- /*
- * Do anything required before you start reading samples.
- * Read file header.
- * Find out sampling rate,
- * size and style of samples,
- * mono/stereo/quad.
- */
- void maudstartread(ft)
- ft_t ft;
- {
- struct maudstuff * p = (struct maudstuff *) ft->priv;
-
- char buf[12];
- char *chunk_buf;
-
- unsigned short bitpersam;
- ULONG nom;
- unsigned short denom;
- unsigned short chaninf;
-
- ULONG chunksize;
-
- int littlendian = 1;
- char *endptr;
-
- /* Needed for rawread() */
- rawstartread(ft);
-
- endptr = (char *) &littlendian;
- /* maud is in big endian format. Swap whats read in
- * on little endian machines.
- */
- if (*endptr)
- {
- ft->swap = ft->swap ? 0 : 1;
- }
-
- /* read FORM chunk */
- if (fread(buf, 1, 4, ft->fp) != 4 || strncmp(buf, "FORM", 4) != 0)
- fail("MAUD: header does not begin with magic word 'FORM'");
-
- rlong(ft); /* totalsize */
-
- if (fread(buf, 1, 4, ft->fp) != 4 || strncmp(buf, "MAUD", 4) != 0)
- fail("MAUD: 'FORM' chunk does not specify 'MAUD' as type");
-
- /* read chunks until 'BODY' (or end) */
-
- while (fread(buf,1,4,ft->fp) == 4 && strncmp(buf,"MDAT",4) != 0) {
-
- /*
- buf[4] = 0;
- report("chunk %s",buf);
- */
-
- if (strncmp(buf,"MHDR",4) == 0) {
-
- chunksize = rlong(ft);
- if (chunksize != 8*4) fail ("MAUD: MHDR chunk has bad size");
-
- /* fseek(ft->fp,12,SEEK_CUR); */
-
- p->nsamples = rlong(ft); /* number of samples stored in MDAT */
- bitpersam = rshort(ft); /* number of bits per sample as stored in MDAT */
- rshort(ft); /* number of bits per sample after decompression */
- nom = rlong(ft); /* clock source frequency */
- denom = rshort(ft); /* clock devide */
- if (denom == 0) fail("MAUD: frequency denominator == 0, failed");
-
- ft->info.rate = nom / denom;
-
- chaninf = rshort(ft); /* channel information */
- switch (chaninf) {
- case 0:
- ft->info.channels = 1;
- break;
- case 1:
- ft->info.channels = 2;
- break;
- default:
- fail("MAUD: unsupported number of channels in file");
- break;
- }
-
- chaninf = rshort(ft); /* number of channels (mono: 1, stereo: 2, ...) */
- if (chaninf != ft->info.channels) fail("MAUD: unsupported number of channels in file");
-
- chaninf = rshort(ft); /* compression type */
-
- rlong(ft); /* rest of chunk, unused yet */
- rlong(ft);
- rlong(ft);
-
- if (bitpersam == 8 && chaninf == 0) {
- ft->info.size = BYTE;
- ft->info.style = UNSIGNED;
- }
- else if (bitpersam == 8 && chaninf == 2) {
- ft->info.size = BYTE;
- ft->info.style = ALAW;
- }
- else if (bitpersam == 8 && chaninf == 3) {
- ft->info.size = BYTE;
- ft->info.style = ULAW;
- }
- else if (bitpersam == 16 && chaninf == 0) {
- ft->info.size = WORD;
- ft->info.style = SIGN2;
- }
- else fail("MAUD: unsupported compression type detected");
-
- ft->comment = 0;
-
- continue;
- }
-
- if (strncmp(buf,"ANNO",4) == 0) {
- chunksize = rlong(ft);
- if (chunksize & 1)
- chunksize++;
- chunk_buf = (char *) malloc(chunksize + 1);
- if (fread(chunk_buf,1,(int)chunksize,ft->fp)
- != chunksize)
- fail("MAUD: Unexpected EOF in ANNO header");
- chunk_buf[chunksize] = '\0';
- report ("%s",chunk_buf);
- free(chunk_buf);
-
- continue;
- }
-
- /* some other kind of chunk */
- chunksize = rlong(ft);
- if (chunksize & 1)
- chunksize++;
- fseek(ft->fp,chunksize,SEEK_CUR);
- continue;
-
- }
-
- if (strncmp(buf,"MDAT",4) != 0) fail("MAUD: MDAT chunk not found");
- p->nsamples = rlong(ft);
- }
-
- /*
- * Read up to len samples from file.
- * Convert to signed longs.
- * Place in buf[].
- * Return number of samples read.
- */
-
- LONG maudread(ft, buf, len)
- ft_t ft;
- LONG *buf, len;
- {
- return (rawread(ft, buf, len));
- }
-
- /*
- * Do anything required when you stop reading samples.
- * Don't close input file!
- */
- void maudstopread(ft)
- ft_t ft;
- {
- /* Needed because of rawread() */
- rawstopread(ft);
- }
-
- void maudstartwrite(ft)
- ft_t ft;
- {
- struct maudstuff * p = (struct maudstuff *) ft->priv;
-
- int littlendian = 1;
- char *endptr;
-
- /* Needed for rawwrite() */
- rawstartwrite(ft);
-
- endptr = (char *) &littlendian;
- /* maud is in big endian format. Swap whats read in
- * on little endian machines.
- */
- if (*endptr)
- {
- ft->swap = ft->swap ? 0 : 1;
- }
-
- /* If you have to seek around the output file */
- if (! ft->seekable) fail("Output .maud file must be a file, not a pipe");
-
- if (ft->info.channels != 1 && ft->info.channels != 2) {
- fail("MAUD: unsupported number of channels, unable to store");
- }
- if (ft->info.size == WORD) ft->info.style = SIGN2;
- if (ft->info.style == ULAW || ft->info.style == ALAW) ft->info.size = BYTE;
- if (ft->info.size == BYTE && ft->info.style == SIGN2) ft->info.style = UNSIGNED;
-
- p->nsamples = 0x7f000000L;
- maudwriteheader(ft);
- p->nsamples = 0;
- }
-
- void maudwrite(ft, buf, len)
- ft_t ft;
- LONG *buf, len;
- {
- struct maudstuff * p = (struct maudstuff *) ft->priv;
-
- p->nsamples += len;
-
- rawwrite(ft, buf, len);
- }
-
- void maudstopwrite(ft)
- ft_t ft;
- {
- /* Flush out remaining samples*/
- rawstopwrite(ft);
-
- /* All samples are already written out. */
-
- if (fseek(ft->fp, 0L, 0) != 0) fail("can't rewind output file to rewrite MAUD header");
-
- maudwriteheader(ft);
- }
-
- #define MAUDHEADERSIZE (4+(4+4+32)+(4+4+32)+(4+4))
- void maudwriteheader(ft)
- ft_t ft;
- {
- struct maudstuff * p = (struct maudstuff *) ft->priv;
-
- fputs ("FORM", ft->fp);
- wlong(ft, (p->nsamples*ft->info.size) + MAUDHEADERSIZE); /* size of file */
- fputs("MAUD", ft->fp); /* File type */
-
- fputs ("MHDR", ft->fp);
- wlong(ft, (LONG) 8*4); /* number of bytes to follow */
- wlong(ft, (LONG) (p->nsamples )); /* number of samples stored in MDAT */
-
- switch (ft->info.style) {
-
- case UNSIGNED:
- wshort(ft, (int) 8); /* number of bits per sample as stored in MDAT */
- wshort(ft, (int) 8); /* number of bits per sample after decompression */
- break;
-
- case SIGN2:
- wshort(ft, (int) 16); /* number of bits per sample as stored in MDAT */
- wshort(ft, (int) 16); /* number of bits per sample after decompression */
- break;
-
- case ALAW:
- case ULAW:
- wshort(ft, (int) 8); /* number of bits per sample as stored in MDAT */
- wshort(ft, (int) 16); /* number of bits per sample after decompression */
- break;
-
- }
-
- wlong(ft, (LONG) ft->info.rate); /* clock source frequency */
- wshort(ft, (int) 1); /* clock devide */
-
- if (ft->info.channels == 1) {
- wshort(ft, (int) 0); /* channel information */
- wshort(ft, (int) 1); /* number of channels (mono: 1, stereo: 2, ...) */
- }
- else {
- wshort(ft, (int) 1);
- wshort(ft, (int) 2);
- }
-
- switch (ft->info.style) {
-
- case UNSIGNED:
- case SIGN2:
- wshort(ft, (int) 0); /* no compression */
- break;
-
- case ULAW:
- wshort(ft, (int) 3);
- break;
-
- case ALAW:
- wshort(ft, (int) 2);
- break;
-
- }
-
- wlong(ft, (LONG) 0); /* reserved */
- wlong(ft, (LONG) 0); /* reserved */
- wlong(ft, (LONG) 0); /* reserved */
-
- fputs ("ANNO", ft->fp);
- wlong(ft, (LONG) 32); /* length of block */
- fputs ("file written by SOX MAUD-export ", ft->fp);
-
- fputs ("MDAT", ft->fp);
- wlong(ft, p->nsamples * ft->info.size ); /* samples in file */
- }
-
-