83 lines
1.5 KiB
C
83 lines
1.5 KiB
C
/*
|
|
* linear.c
|
|
*
|
|
* Converts pvf <--> linear.
|
|
*
|
|
* $Id: linear.c,v 1.5 1999/03/16 09:59:20 marcs Exp $
|
|
*
|
|
*/
|
|
|
|
#include "../include/voice.h"
|
|
|
|
int pvftolin (FILE *fd_in, FILE *fd_out, pvf_header *header_in, int is_signed,
|
|
int bits16, int intel)
|
|
{
|
|
int data;
|
|
|
|
while (1)
|
|
{
|
|
data = header_in->read_pvf_data(fd_in) >> 8;
|
|
if (feof(fd_in))
|
|
break;
|
|
|
|
if (data > 0x7fff)
|
|
data = 0x7fff;
|
|
|
|
if (data < -0x8000)
|
|
data = -0x8000;
|
|
|
|
if (!is_signed)
|
|
data += 0x8000;
|
|
|
|
if (bits16 && intel)
|
|
putc(data & 0xff, fd_out);
|
|
|
|
putc((data >> 8), fd_out);
|
|
|
|
if (bits16 && !intel)
|
|
putc(data & 0xff, fd_out);
|
|
|
|
}
|
|
|
|
return(OK);
|
|
}
|
|
|
|
int lintopvf (FILE *fd_in, FILE *fd_out, pvf_header *header_out,
|
|
int is_signed, int bits16, int intel)
|
|
{
|
|
int data;
|
|
|
|
while ((data = getc(fd_in)) != EOF)
|
|
{
|
|
|
|
if (bits16)
|
|
{
|
|
|
|
if (intel)
|
|
data |= (getc(fd_in) << 8);
|
|
else
|
|
{
|
|
data <<= 8;
|
|
data |= (getc(fd_in));
|
|
}
|
|
|
|
}
|
|
else
|
|
data = (data << 8);
|
|
|
|
if (is_signed)
|
|
{
|
|
|
|
if (data > 0x7fff)
|
|
data -= 0x10000;
|
|
|
|
}
|
|
else
|
|
data -= 0x8000;
|
|
|
|
header_out->write_pvf_data(fd_out, ((data) << 8));
|
|
}
|
|
|
|
return(OK);
|
|
}
|