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/************************************************************************
*
* putbits.c, bitstream handling for tmn (TMN encoder)
*
* Copyright (C) 1997 University of BC, Canada
*
* Contacts:
* Michael Gallant <mikeg@ee.ubc.ca>
* Guy Cote <guyc@ee.ubc.ca>
* Berna Erol <bernae@ee.ubc.ca>
*
* UBC Image Processing Laboratory http://www.ee.ubc.ca/image
* 2356 Main Mall tel.: +1 604 822 4051
* Vancouver BC Canada V6T1Z4 fax.: +1 604 822 5949
*
* Copyright (C) 1995, 1996 Telenor R&D, Norway
*
* Contacts:
* Robert Danielsen <Robert.Danielsen@nta.no>
*
* Telenor Research and Development http://www.nta.no/brukere/DVC/
* P.O.Box 83 tel.: +47 63 84 84 00
* N-2007 Kjeller, Norway fax.: +47 63 81 00 76
*
************************************************************************/
/* Disclaimer of Warranty
*
* These software programs are available to the user without any license fee
* or royalty on an "as is" basis. The University of British Columbia
* disclaims any and all warranties, whether express, implied, or
* statuary, including any implied warranties or merchantability or of
* fitness for a particular purpose. In no event shall the
* copyright-holder be liable for any incidental, punitive, or
* consequential damages of any kind whatsoever arising from the use of
* these programs.
*
* This disclaimer of warranty extends to the user of these programs and
* user's customers, employees, agents, transferees, successors, and
* assigns.
*
* The University of British Columbia does not represent or warrant that the
* programs furnished hereunder are free of infringement of any
* third-party patents.
*
* Commercial implementations of H.263, including shareware, are subject to
* royalty fees to patent holders. Many of these patents are general
* enough such that they are unavoidable regardless of implementation
* design.
*
*/
/************************************************************************
* Based on functions in the MPEG-2 software encoder by the
* MPEG-2 Software Simulation Group, modified by
*
* Robert Danielsen, <Robert.Danielsen@nta.no>
************************************************************************/
#include "sim.h"
#ifdef VIC
/*extern*/
int h263_streamcount;
/*extern*/
unsigned char *h263_bitstream;
#else
extern FILE *streamfile; /* the only global var we need here */
#endif
/* private data */
static unsigned char outbfr;
static int outcnt;
static int bytecnt;
/* initialize buffer, call once before first putbits or alignbits */
void
initbits ()
{
outcnt = 8;
bytecnt = 0;
}
/* write rightmost n (0<=n<=32) bits of val to outfile */
void
putbits (int n, int val)
{
int i;
unsigned int mask;
char bitstring[32];
if (trace)
{
if (n > 0)
{
BitPrint (n, val, bitstring);
fprintf (tf, bitstring);
}
}
mask = 1 << (n - 1); /* selects first (leftmost) bit */
for (i = 0; i < n; i++)
{
outbfr <<= 1;
if (val & mask)
outbfr |= 1;
mask >>= 1; /* select next bit */
outcnt--;
if (outcnt == 0) /* 8 bit buffer full */
{
#ifdef VIC
h263_bitstream[h263_streamcount++] = outbfr;
#else
putc (outbfr, streamfile);
#endif
outcnt = 8;
bytecnt++;
}
}
}
/* SAC specific function to record trailing zeros and avoid PSC emulation */
void
sacPutbits (int n, int val)
{
int i;
unsigned int mask;
mask = 1 << (n-1); /* selects first (leftmost) bit */
for (i=0; i<n; i++) {
bit_in_psc_layer((val&mask)>0?1:0);
mask >>= 1; /* select next bit */
}
}
/* zero bit stuffing to next byte boundary (5.2.3, 6.2.1) */
int
alignbits ()
{
int ret_value;
if (outcnt != 8)
{
ret_value = outcnt; /* outcnt is reset in call to putbits () */
putbits (outcnt, 0);
return ret_value;
} else
return 0;
}
/* return total number of generated bits */
int
bitcount ()
{
return 8 * bytecnt + (8 - outcnt);
}
/* convert to binary number */
void
BitPrint (int length, int val, char *bit)
{
int m;
m = length;
bit[0] = '"';
while (m--)
{
bit[length - m] = (val & (1 << m)) ? '1' : '0';
}
bit[length + 1] = '"';
bit[length + 2] = '\n';
bit[length + 3] = '\0';
return;
}
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