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1999-06-02
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/**********************************************************************
* ISO MPEG Audio Subgroup Software Simulation Group (1996)
* ISO 13818-3 MPEG-2 Audio Encoder - Lower Sampling Frequency Extension
*
* $Id: common.c,v 1.2 1997/01/19 22:28:29 rowlands Exp $
*
* $Log: common.c,v $
* Revision 1.2 1997/01/19 22:28:29 rowlands
* Layer 3 bug fixes from Seymour Shlien
*
* Revision 1.1 1996/02/14 04:04:23 rowlands
* Initial revision
*
* Received from Mike Coleman
**********************************************************************/
/***********************************************************************
*
* Global Include Files
*
***********************************************************************/
#include "common.h"
#include <string.h> /* 1995-07-11 shn */
#include <ctype.h>
#include <assert.h>
#include <stdlib.h>
/***********************************************************************
*
* Global Variable Definitions
*
***********************************************************************/
char *mode_names[4] = { "stereo", "j-stereo", "dual-ch", "single-ch" };
char *layer_names[3] = { "I", "II", "III" };
char *version_names[2] = { "MPEG-2 LSF", "MPEG-1" };
/* 1: MPEG-1, 0: MPEG-2 LSF, 1995-07-11 shn */
double s_freq[2][4] = {{22.05, 24, 16, 0}, {44.1, 48, 32, 0}};
/* 1: MPEG-1, 0: MPEG-2 LSF, 1995-07-11 shn */
int bitrate[2][3][15] = {
{{0,32,48,56,64,80,96,112,128,144,160,176,192,224,256},
{0,8,16,24,32,40,48,56,64,80,96,112,128,144,160},
{0,8,16,24,32,40,48,56,64,80,96,112,128,144,160}},
{{0,32,64,96,128,160,192,224,256,288,320,352,384,416,448},
{0,32,48,56,64,80,96,112,128,160,192,224,256,320,384},
{0,32,40,48,56,64,80,96,112,128,160,192,224,256,320}}
};
double FAR multiple[64] = {
2.00000000000000, 1.58740105196820, 1.25992104989487,
1.00000000000000, 0.79370052598410, 0.62996052494744, 0.50000000000000,
0.39685026299205, 0.31498026247372, 0.25000000000000, 0.19842513149602,
0.15749013123686, 0.12500000000000, 0.09921256574801, 0.07874506561843,
0.06250000000000, 0.04960628287401, 0.03937253280921, 0.03125000000000,
0.02480314143700, 0.01968626640461, 0.01562500000000, 0.01240157071850,
0.00984313320230, 0.00781250000000, 0.00620078535925, 0.00492156660115,
0.00390625000000, 0.00310039267963, 0.00246078330058, 0.00195312500000,
0.00155019633981, 0.00123039165029, 0.00097656250000, 0.00077509816991,
0.00061519582514, 0.00048828125000, 0.00038754908495, 0.00030759791257,
0.00024414062500, 0.00019377454248, 0.00015379895629, 0.00012207031250,
0.00009688727124, 0.00007689947814, 0.00006103515625, 0.00004844363562,
0.00003844973907, 0.00003051757813, 0.00002422181781, 0.00001922486954,
0.00001525878906, 0.00001211090890, 0.00000961243477, 0.00000762939453,
0.00000605545445, 0.00000480621738, 0.00000381469727, 0.00000302772723,
0.00000240310869, 0.00000190734863, 0.00000151386361, 0.00000120155435,
1E-20
};
enum byte_order NativeByteOrder = order_unknown;
/***********************************************************************
*
* Global Function Definitions
*
***********************************************************************/
/***********************************************************************
* compute bitsperframe and mean_bits for a layer III frame
**********************************************************************/
void getframebits(layer *info, int stereo, int *bitsPerFrame, int *mean_bits) {
int whole_SpF;
double bit_rate,samp;
int samplesPerFrame,bitsPerSlot;
int sideinfo_len;
int mode_gr;
samp = s_freq[info->version][info->sampling_frequency];
bit_rate = bitrate[info->version][info->lay-1][info->bitrate_index];
samplesPerFrame = info->version == 1 ? 1152 : 576;
bitsPerSlot = 8;
mode_gr = (info->version == 1) ? 2 : 1; /* mode_gr = 2 */
/* determine the mean bitrate for main data */
sideinfo_len = 32;
if ( info->version == 1 )
{ /* MPEG 1 */
if ( stereo == 1 )
sideinfo_len += 136;
else
sideinfo_len += 256;
}
else
{ /* MPEG 2 */
if ( stereo == 1 )
sideinfo_len += 72;
else
sideinfo_len += 136;
}
whole_SpF = (samplesPerFrame /samp)*(bit_rate / (double)bitsPerSlot);
*bitsPerFrame = 8 * whole_SpF + (info->padding * 8);
*mean_bits = (*bitsPerFrame - sideinfo_len) / mode_gr;
}
/* jsbound is ignored for layer 3 */
int js_bound(lay, m_ext)
int lay, m_ext;
{
static int jsb_table[3][4] = { { 4, 8, 12, 16 }, { 4, 8, 12, 16},
{ 0, 4, 8, 16} }; /* lay+m_e -> jsbound */
if(lay<1 || lay >3 || m_ext<0 || m_ext>3) {
if (m_ext!=10) /* mark taylor 5/99 added mode=10 */
{
fprintf(stderr, "js_bound bad layer/modext (%d/%d)\n", lay, m_ext);
exit(1);
}
}
return(jsb_table[lay-1][m_ext]);
}
void hdr_to_frps(fr_ps) /* interpret data in hdr str to fields in fr_ps */
frame_params *fr_ps;
{
layer *hdr = fr_ps->header; /* (or pass in as arg?) */
fr_ps->actual_mode = hdr->mode;
fr_ps->stereo = (hdr->mode == MPG_MD_MONO) ? 1 : 2;
if (hdr->lay == 2){
printf("Only Layer 3 supported\n");
exit(-1);}
else fr_ps->sblimit = SBLIMIT;
if(hdr->mode == MPG_MD_JOINT_STEREO)
fr_ps->jsbound = js_bound(hdr->lay, hdr->mode_ext);
else
fr_ps->jsbound = fr_ps->sblimit;
/* alloc, tab_num set in pick_table */
}
void WriteHdr(fr_ps, s)
frame_params *fr_ps;
FILE *s;
{
layer *info = fr_ps->header;
fprintf(s, "HDR: s=FFF, id=%X, l=%X, ep=%s, br=%X, sf=%X, pd=%X, ",
info->version, info->lay, ((info->error_protection) ? "on" : "off"),
info->bitrate_index, info->sampling_frequency, info->padding);
fprintf(s, "pr=%X, m=%X, js=%X, c=%X, o=%X, e=%X\n",
info->extension, info->mode, info->mode_ext,
info->copyright, info->original, info->emphasis);
fprintf(s, "alg.=%s, layer=%s, tot bitrate=%d, sfrq=%.1f\n",
version_names[info->version], layer_names[info->lay-1],
bitrate[info->version][info->lay-1][info->bitrate_index],
s_freq[info->version][info->sampling_frequency]);
fprintf(s, "mode=%s, sblim=%d, jsbd=%d, ch=%d\n",
mode_names[info->mode], fr_ps->sblimit, fr_ps->jsbound, fr_ps->stereo);
fflush(s);
}
int BitrateIndex(layr, bRate, version) /* convert bitrate in kbps to index */
int layr; /* 1 or 2 */
int bRate; /* legal rates from 32 to 448 */
int version; /* MPEG-1 or MPEG-2 LSF */
{
int index = 0;
int found = 0;
while(!found && index<15) {
if(bitrate[version][layr-1][index] == bRate)
found = 1;
else
++index;
}
if(found)
return(index);
else {
fprintf(stderr, "BitrateIndex: %d (layer %d) is not a legal bitrate\n",
bRate, layr);
return(-1); /* Error! */
}
}
int SmpFrqIndex(sRate, version) /* convert samp frq in Hz to index */
long sRate; /* legal rates 16000, 22050, 24000, 32000, 44100, 48000 */
int *version;
{
if (sRate == 44100L) {
*version = MPEG_AUDIO_ID; return(0);
}
else if (sRate == 48000L) {
*version = MPEG_AUDIO_ID; return(1);
}
else if (sRate == 32000L) {
*version = MPEG_AUDIO_ID; return(2);
}
else if (sRate == 24000L) {
*version = MPEG_PHASE2_LSF; return(1);
}
else if (sRate == 22050L) {
*version = MPEG_PHASE2_LSF; return(0);
}
else if (sRate == 16000L) {
*version = MPEG_PHASE2_LSF; return(2);
}
else {
fprintf(stderr, "SmpFrqIndex: %ld is not a legal sample rate\n", sRate);
return(-1); /* Error! */
}
}
/*******************************************************************************
*
* Allocate number of bytes of memory equal to "block".
*
*******************************************************************************/
void FAR *mem_alloc(block, item)
unsigned long block;
char *item;
{
void *ptr;
ptr = (void FAR *) malloc(block<<1); /* allocate twice as much memory as needed. fixes dodgy
memory problem on most systems */
if (ptr != NULL){
memset(ptr, 0, block);
}
else{
printf("Unable to allocate %s\n", item);
exit(0);
}
return(ptr);
}
/****************************************************************************
*
* Free memory pointed to by "*ptr_addr".
*
*****************************************************************************/
void mem_free(ptr_addr)
void **ptr_addr;
{
if (*ptr_addr != NULL){
free(*ptr_addr);
*ptr_addr = NULL;
}
}
/*****************************************************************************
*
* Routines to determine byte order and swap bytes
*
*****************************************************************************/
enum byte_order DetermineByteOrder()
{
char s[ sizeof(long) + 1 ];
union
{
long longval;
char charval[ sizeof(long) ];
} probe;
probe.longval = 0x41424344L; /* ABCD in ASCII */
strncpy( s, probe.charval, sizeof(long) );
s[ sizeof(long) ] = '\0';
/* fprintf( stderr, "byte order is %s\n", s ); */
if ( strcmp(s, "ABCD") == 0 )
return order_bigEndian;
else
if ( strcmp(s, "DCBA") == 0 )
return order_littleEndian;
else
return order_unknown;
}
void SwapBytesInWords( short *loc, int words )
{
int i;
short thisval;
char *dst, *src;
src = (char *) &thisval;
for ( i = 0; i < words; i++ )
{
thisval = *loc;
dst = (char *) loc++;
dst[0] = src[1];
dst[1] = src[0];
}
}
/*****************************************************************************
*
* Read Audio Interchange File Format (AIFF) headers.
*
*****************************************************************************/
int aiff_read_headers( FILE *file_ptr, IFF_AIFF *aiff_ptr )
{
int chunkSize, subSize, sound_position;
if ( fseek(file_ptr, 0, SEEK_SET) != 0 )
return -1;
if ( Read32BitsHighLow(file_ptr) != IFF_ID_FORM )
return -1;
chunkSize = Read32BitsHighLow( file_ptr );
if ( Read32BitsHighLow(file_ptr) != IFF_ID_AIFF )
return -1;
sound_position = 0;
while ( chunkSize > 0 )
{
chunkSize -= 4;
switch ( Read32BitsHighLow(file_ptr) )
{
case IFF_ID_COMM:
chunkSize -= subSize = Read32BitsHighLow( file_ptr );
aiff_ptr->numChannels = Read16BitsHighLow( file_ptr );
subSize -= 2;
aiff_ptr->numSampleFrames = Read32BitsHighLow( file_ptr );
subSize -= 4;
aiff_ptr->sampleSize = Read16BitsHighLow( file_ptr );
subSize -= 2;
aiff_ptr->sampleRate = ReadIeeeExtendedHighLow( file_ptr );
subSize -= 10;
while ( subSize > 0 )
{
getc( file_ptr );
subSize -= 1;
}
break;
case IFF_ID_SSND:
chunkSize -= subSize = Read32BitsHighLow( file_ptr );
aiff_ptr->blkAlgn.offset = Read32BitsHighLow( file_ptr );
subSize -= 4;
aiff_ptr->blkAlgn.blockSize = Read32BitsHighLow( file_ptr );
subSize -= 4;
sound_position = ftell( file_ptr ) + aiff_ptr->blkAlgn.offset;
if ( fseek(file_ptr, (long) subSize, SEEK_CUR) != 0 )
return -1;
aiff_ptr->sampleType = IFF_ID_SSND;
break;
default:
chunkSize -= subSize = Read32BitsHighLow( file_ptr );
while ( subSize > 0 )
{
getc( file_ptr );
subSize -= 1;
}
break;
}
}
return sound_position;
}
/*****************************************************************************
*
* Seek past some Audio Interchange File Format (AIFF) headers to sound data.
*
*****************************************************************************/
int aiff_seek_to_sound_data( FILE *file_ptr )
{
if ( fseek(file_ptr, AIFF_FORM_HEADER_SIZE + AIFF_SSND_HEADER_SIZE, SEEK_SET) != 0 )
return(-1);
return(0);
}
/*******************************************************************************
*
* Write Audio Interchange File Format (AIFF) headers.
*
*******************************************************************************/
int aiff_write_headers( FILE *file_ptr, IFF_AIFF *aiff_ptr )
{
int chunkSize;
int sampleBytes = (aiff_ptr->sampleSize / 8) + (aiff_ptr->sampleSize % 8 ? 1 : 0);
if ( fseek(file_ptr, 0L, SEEK_SET) != 0 )
return -1;
/* write FORM chunk */
chunkSize = 8 + 18 + 8 + aiff_ptr->numChannels * aiff_ptr->numSampleFrames * sampleBytes;
Write32BitsHighLow( file_ptr, IFF_ID_FORM );
Write32BitsHighLow( file_ptr, chunkSize );
Write32BitsHighLow( file_ptr, IFF_ID_AIFF );
/* write COMM chunk */
Write32BitsHighLow( file_ptr, IFF_ID_COMM );
Write32BitsHighLow( file_ptr, 18 ); /* chunk size */
Write16BitsHighLow( file_ptr, aiff_ptr->numChannels );
Write32BitsHighLow( file_ptr, aiff_ptr->numSampleFrames );
Write16BitsHighLow( file_ptr, aiff_ptr->sampleSize );
WriteIeeeExtendedHighLow( file_ptr, aiff_ptr->sampleRate );
/* write SSND chunk header */
chunkSize = 8 + aiff_ptr->numChannels * aiff_ptr->numSampleFrames * sampleBytes;
Write32BitsHighLow( file_ptr, IFF_ID_SSND );
Write32BitsHighLow( file_ptr, chunkSize );
Write32BitsHighLow( file_ptr, 0 ); /* offset */
Write32BitsHighLow( file_ptr, 0 ); /* block size */
return 0;
}
/*****************************************************************************
*
* bit_stream.c package
* Author: Jean-Georges Fritsch, C-Cube Microsystems
*
*****************************************************************************/
/********************************************************************
This package provides functions to write (exclusive or read)
information from (exclusive or to) the bit stream.
If the bit stream is opened in read mode only the get functions are
available. If the bit stream is opened in write mode only the put
functions are available.
********************************************************************/
/*open_bit_stream_w(); open the device to write the bit stream into it */
/*open_bit_stream_r(); open the device to read the bit stream from it */
/*close_bit_stream(); close the device containing the bit stream */
/*alloc_buffer(); open and initialize the buffer; */
/*desalloc_buffer(); empty and close the buffer */
/*back_track_buffer(); goes back N bits in the buffer */
/*unsigned int get1bit(); read 1 bit from the bit stream */
/*unsigned long look_ahead(); grep the next N bits in the bit stream without*/
/* changing the buffer pointer */
/*put1bit(); write 1 bit from the bit stream */
/*put1bit(); write 1 bit from the bit stream */
/*putbits(); write N bits from the bit stream */
/*unsigned long sstell(); return the current bit stream length (in bits) */
/*int end_bs(); return 1 if the end of bit stream reached otherwise 0 */
/*int seek_sync(); return 1 if a sync word was found in the bit stream */
/* otherwise returns 0 */
/* refill the buffer from the input device when the buffer becomes empty */
int refill_buffer(bs)
Bit_stream_struc *bs; /* bit stream structure */
{
register int i=bs->buf_size-2-bs->buf_byte_idx;
register unsigned long n=1;
register int index=0;
char val[2];
#ifndef _BLADEDLL
while ((i>=0) && (!bs->eob)) {
if (bs->format == BINARY)
n = fread(&bs->buf[i--], sizeof(unsigned char), 1, bs->pt);
else {
while((index < 2) && n) {
n = fread(&val[index], sizeof(char), 1, bs->pt);
switch (val[index]) {
case 0x30:
case 0x31:
case 0x32:
case 0x33:
case 0x34:
case 0x35:
case 0x36:
case 0x37:
case 0x38:
case 0x39:
case 0x41:
case 0x42:
case 0x43:
case 0x44:
case 0x45:
case 0x46:
index++;
break;
default: break;
}
}
if (val[0] <= 0x39) bs->buf[i] = (val[0] - 0x30) << 4;
else bs->buf[i] = (val[0] - 0x37) << 4;
if (val[1] <= 0x39) bs->buf[i--] |= (val[1] - 0x30);
else bs->buf[i--] |= (val[1] - 0x37);
index = 0;
}
if (!n) {
bs->eob= i+1;
}
}
#endif
return 0;
}
/* empty the buffer to the output device when the buffer becomes full */
/* mt 3/99: modified so we can call empty_buffer even if buffer is not full */
void empty_buffer(bs, minimum)
Bit_stream_struc *bs; /* bit stream structure */
int minimum; /* end of the buffer to empty */
{
register int i;
#ifndef DISTRIB
#if BS_FORMAT == BINARY
for (i=bs->buf_size-1;i>=minimum;i--)
{
#ifdef _BLADEDLL
if (bs->nOutBufPos<BUFFER_SIZE)
{
bs->pbtOutBuf[bs->nOutBufPos++]=bs->buf[i];
}
else
{
assert(0);
}
#else
fwrite(&bs->buf[i], sizeof(unsigned char), 1, bs->pt);
#endif // _BLADEDLL
}
#else
static char *he = "0123456789ABCDEF";
for (i=bs->buf_size-1;i>=minimum;i--) {
char val[2];
val[0] = he[((bs->buf[i] >> 4) & 0x0F)];
val[1] = he[(bs->buf[i] & 0x0F)];
fwrite(val, sizeof(char), 2, bs->pt);
}
#endif // BS_FORMAT==BINARY
#ifndef _BLADEDLL
// NEW SS to assist in debugging
// Only file for files, not for the output buffer
fflush(bs->pt);
#endif
#endif
/* for (i=minimum-1; i>=0; i--) */
for (i=minimum-1; i>=bs->buf_byte_idx+1; i--)
bs->buf[bs->buf_size - minimum + i] = bs->buf[i];
/* bs->buf_byte_idx = bs->buf_size -1 - minimum; */
bs->buf_byte_idx = bs->buf_size -1 - minimum + bs->buf_byte_idx + 1;
bs->buf_bit_idx = 8;
}
/* open the device to write the bit stream into it */
void open_bit_stream_w(bs, bs_filenam, size)
Bit_stream_struc *bs; /* bit stream structure */
char *bs_filenam; /* name of the bit stream file */
int size; /* size of the buffer */
{
#ifdef _BLADEDLL
// Initialize output buffer
bs->pbtOutBuf=NULL;
bs->nOutBufPos=0;
#else
if (!strcmp(bs_filenam, "-")) {
/* Write to standard output. */
bs->pt = stdout;
} else {
if ((bs->pt = fopen(bs_filenam, "wb")) == NULL) {
printf("Could not create \"%s\".\n", bs_filenam);
exit(1);
}
}
#endif
alloc_buffer(bs, size);
bs->buf_byte_idx = size-1;
bs->buf_bit_idx=8;
bs->totbit=0;
bs->mode = WRITE_MODE;
bs->eob = FALSE;
bs->eobs = FALSE;
}
/*close the device containing the bit stream after a write process*/
void close_bit_stream_w(bs)
Bit_stream_struc *bs; /* bit stream structure */
{
// Flush last bytes
empty_buffer(bs, bs->buf_byte_idx);
#ifndef _BLADEDLL
// Close the file
fclose(bs->pt);
#endif // _BLADEDLL
// Deallocate all buffers
desalloc_buffer(bs);
}
/*open and initialize the buffer; */
void alloc_buffer(bs, size)
Bit_stream_struc *bs; /* bit stream structure */
int size;
{
bs->buf = (unsigned char FAR *) mem_alloc(size*sizeof(unsigned
char), "buffer");
bs->buf_size = size;
}
/*empty and close the buffer */
void desalloc_buffer(bs)
Bit_stream_struc *bs; /* bit stream structure */
{
free(bs->buf);
}
int putmask[9]={0x0, 0x1, 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff};
int clearmask[9]={0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80, 0x0};
int mask[8]={0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80};
#if 0
/*read 1 bit from the bit stream */
unsigned int get1bit(bs)
Bit_stream_struc *bs; /* bit stream structure */
{
unsigned int bit;
register int i;
bs->totbit++;
if (!bs->buf_bit_idx) {
bs->buf_bit_idx = 8;
bs->buf_byte_idx--;
if ((bs->buf_byte_idx < MINIMUM) || (bs->buf_byte_idx < bs->eob)) {
if (bs->eob)
bs->eobs = TRUE;
else {
for (i=bs->buf_byte_idx; i>=0;i--)
bs->buf[bs->buf_size-1-bs->buf_byte_idx+i] = bs->buf[i];
refill_buffer(bs);
bs->buf_byte_idx = bs->buf_size-1;
}
}
}
bit = bs->buf[bs->buf_byte_idx]&mask[bs->buf_bit_idx-1];
bit = bit >> (bs->buf_bit_idx-1);
bs->buf_bit_idx--;
return(bit);
}
#endif
/*write 1 bit from the bit stream */
void put1bit(bs, bit)
Bit_stream_struc *bs; /* bit stream structure */
int bit; /* bit to write into the buffer */
{
bs->totbit++;
bs->buf[bs->buf_byte_idx] |= (bit&0x1) << (bs->buf_bit_idx-1);
bs->buf_bit_idx--;
if (!bs->buf_bit_idx) {
bs->buf_bit_idx = 8;
bs->buf_byte_idx--;
if (bs->buf_byte_idx < 0)
empty_buffer(bs, MINIMUM);
bs->buf[bs->buf_byte_idx] = 0;
}
}
/*look ahead for the next N bits from the bit stream */
unsigned long look_ahead(bs, N)
Bit_stream_struc *bs; /* bit stream structure */
int N; /* number of bits to read from the bit stream */
{
unsigned long val=0;
register int j = N;
register int k, tmp;
register int bit_idx = bs->buf_bit_idx;
register int byte_idx = bs->buf_byte_idx;
if (N > MAX_LENGTH)
printf("Cannot read or write more than %d bits at a time.\n", MAX_LENGTH);
while (j > 0) {
if (!bit_idx) {
bit_idx = 8;
byte_idx--;
}
k = Min (j, bit_idx);
tmp = bs->buf[byte_idx]&putmask[bit_idx];
tmp = tmp >> (bit_idx-k);
val |= tmp << (j-k);
bit_idx -= k;
j -= k;
}
return(val);
}
/*write N bits into the bit stream */
void putbits(bs, val, N)
Bit_stream_struc *bs; /* bit stream structure */
unsigned int val; /* val to write into the buffer */
int N; /* number of bits of val */
{
register int j = N;
register int k, tmp;
if (N > MAX_LENGTH)
printf("Cannot read or write more than %d bits at a time.\n", MAX_LENGTH);
bs->totbit += N;
while (j > 0) {
k = Min(j, bs->buf_bit_idx);
tmp = val >> (j-k);
bs->buf[bs->buf_byte_idx] |= (tmp&putmask[k]) << (bs->buf_bit_idx-k);
bs->buf_bit_idx -= k;
if (!bs->buf_bit_idx) {
bs->buf_bit_idx = 8;
bs->buf_byte_idx--;
if (bs->buf_byte_idx < 0)
empty_buffer(bs, MINIMUM);
bs->buf[bs->buf_byte_idx] = 0;
}
j -= k;
}
}
/*return the current bit stream length (in bits)*/
unsigned long sstell(bs)
Bit_stream_struc *bs; /* bit stream structure */
{
return(bs->totbit);
}
/*return the status of the bit stream*/
/* returns 1 if end of bit stream was reached */
/* returns 0 if end of bit stream was not reached */
int end_bs(bs)
Bit_stream_struc *bs; /* bit stream structure */
{
return(bs->eobs);
}
/*****************************************************************************
*
* End of bit_stream.c package
*
*****************************************************************************/