ref: f6a42c50c040196f3f830d3e51d405d5ae2b8982
dir: /src/cdr.c/
/* * CD-R format handler * * David Elliott, Sony Microsystems - July 5, 1991 * * Copyright 1991 David Elliott 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. * * This code automatically handles endianness differences * * cbagwell (cbagwell@sprynet.com) - 20 April 1998 * * Changed endianness handling. Seemed to be reversed (since format * is in big endian) and made it so that user could always override * swapping no matter what endian machine they are one. * * Fixed bug were trash could be appended to end of file for certain * endian machines. * */ #include "st.h" #define SECTORSIZE (2352 / 2) /* Private data for SKEL file */ typedef struct cdrstuff { LONG samples; /* number of samples written */ } *cdr_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 cdrstartread(ft) ft_t ft; { int littlendian = 1; char *endptr; endptr = (char *) &littlendian; /* CDR is in Big Endian format. Swap whats read in on */ /* Little Endian machines. */ if (*endptr) { ft->swap = ft->swap ? 0 : 1; } ft->info.rate = 44100L; ft->info.size = WORD; ft->info.style = SIGN2; ft->info.channels = 2; ft->comment = NULL; } /* * Read up to len samples from file. * Convert to signed longs. * Place in buf[]. * Return number of samples read. */ LONG cdrread(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 cdrstopread(ft) ft_t ft; { } void cdrstartwrite(ft) ft_t ft; { cdr_t cdr = (cdr_t) ft->priv; int littlendian = 1; char *endptr; endptr = (char *) &littlendian; /* CDR is in Big Endian format. Swap whats written out on */ /* Little Endian Machines. */ if (*endptr) { ft->swap = ft->swap ? 0 : 1; } cdr->samples = 0; ft->info.rate = 44100L; ft->info.size = WORD; ft->info.style = SIGN2; ft->info.channels = 2; } void cdrwrite(ft, buf, len) ft_t ft; LONG *buf, len; { cdr_t cdr = (cdr_t) ft->priv; cdr->samples += len; rawwrite(ft, buf, len); } /* * A CD-R file needs to be padded to SECTORSIZE, which is in terms of * samples. We write -32768 for each sample to pad it out. */ void cdrstopwrite(ft) ft_t ft; { cdr_t cdr = (cdr_t) ft->priv; int padsamps = SECTORSIZE - (cdr->samples % SECTORSIZE); short zero; zero = 0; if (padsamps == SECTORSIZE) { return; } while (padsamps > 0) { wshort(ft, zero); padsamps--; } }