You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
2.2 KiB
92 lines
2.2 KiB
4 months ago
|
/*
|
||
|
|
* Copyright 1996 by Jutta Degener and Carsten Bormann, Technische
|
||
|
|
* Universitaet Berlin. See the accompanying file "COPYRIGHT" for
|
||
|
|
* details. THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*$Header*/
|
||
|
|
|
||
|
|
/* Generate code to pack a bit array from a name:#bits description,
|
||
|
|
* WAV #49 style.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <stdio.h>
|
||
|
|
#include "taste.h"
|
||
|
|
#include "proto.h"
|
||
|
|
#include <limits.h>
|
||
|
|
|
||
|
|
/* This module goes back to one Jeff Chilton used for his implementation
|
||
|
|
* of the #49 WAV GSM format. (In his original patch 8, it replaced
|
||
|
|
* bitter.c.)
|
||
|
|
*
|
||
|
|
* In Microsoft's WAV #49 version of the GSM format, two 32 1/2
|
||
|
|
* byte GSM frames are packed together to make one WAV frame, and
|
||
|
|
* the GSM parameters are packed into bytes right-to-left rather
|
||
|
|
* than left-to-right.
|
||
|
|
*
|
||
|
|
* That is, where toast's GSM format writes
|
||
|
|
*
|
||
|
|
* aaaaaabb bbbbcccc cdddddee ...
|
||
|
|
* ___1____ ___2____ ___3____
|
||
|
|
*
|
||
|
|
* for parameters a (6 bits), b (6 bits), c (5 bits), d (5 bits), e ..
|
||
|
|
* the WAV format has
|
||
|
|
*
|
||
|
|
* bbaaaaaa ccccbbbb eedddddc ...
|
||
|
|
* ___1____ ___2____ ___3____
|
||
|
|
*
|
||
|
|
* (This format looks a lot prettier if one pictures octets coming
|
||
|
|
* in through a fifo queue from the left, rather than waiting in the
|
||
|
|
* right-hand remainder of a C array.)
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define WORD_BITS 16 /* sizeof(uword) * CHAR_BIT on the
|
||
|
|
* target architecture---if this isn't 16,
|
||
|
|
* you're in trouble with this library anyway.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define BYTE_BITS 8 /* CHAR_BIT on the target architecture---
|
||
|
|
* if this isn't 8, you're in *deep* trouble.
|
||
|
|
*/
|
||
|
|
|
||
|
|
void write_code P2((s_spex, n_spex), struct spex * s_spex, int n_spex)
|
||
|
|
{
|
||
|
|
struct spex * sp = s_spex;
|
||
|
|
int n_in = 0;
|
||
|
|
|
||
|
|
printf("uword sr = 0;\n");
|
||
|
|
|
||
|
|
for (; n_spex > 0; n_spex--, sp++) {
|
||
|
|
|
||
|
|
/* insert old
|
||
|
|
* new var value unused
|
||
|
|
* here
|
||
|
|
*
|
||
|
|
* [____________xxxxxx**********]
|
||
|
|
*
|
||
|
|
* <----- n_in ------>
|
||
|
|
*/
|
||
|
|
printf("sr = sr >> %d | %s << %d;\n",
|
||
|
|
sp->varsize,
|
||
|
|
sp->var,
|
||
|
|
WORD_BITS - sp->varsize);
|
||
|
|
|
||
|
|
n_in += sp->varsize;
|
||
|
|
|
||
|
|
while (n_in >= BYTE_BITS) {
|
||
|
|
printf("*c++ = sr >> %d;\n",
|
||
|
|
WORD_BITS - n_in);
|
||
|
|
n_in -= BYTE_BITS;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
while (n_in >= BYTE_BITS) {
|
||
|
|
printf("*c++ = sr >> %d;\n", WORD_BITS - n_in);
|
||
|
|
n_in -= BYTE_BITS;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (n_in > 0) {
|
||
|
|
fprintf(stderr, "warning: %d bits left over\n", n_in);
|
||
|
|
}
|
||
|
|
}
|