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* exception also makes it possible to release a modified version which |
* exception also makes it possible to release a modified version which |
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* carries forward this exception. |
* carries forward this exception. |
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* |
* |
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* $Id: bitstream.h,v 1.14 2002-11-17 00:57:57 edgomez Exp $ |
* $Id: bitstream.h,v 1.16.2.2 2003-07-28 12:39:32 edgomez Exp $ |
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* |
* |
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****************************************************************************/ |
****************************************************************************/ |
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#ifndef _BITSTREAM_H_ |
#ifndef _BITSTREAM_H_ |
58 |
#define _BITSTREAM_H_ |
#define _BITSTREAM_H_ |
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#include <stdio.h> |
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#include "../portab.h" |
#include "../portab.h" |
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#include "../decoder.h" |
#include "../decoder.h" |
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#include "../encoder.h" |
#include "../encoder.h" |
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* Constants |
* Constants |
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****************************************************************************/ |
****************************************************************************/ |
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// comment any #defs we dont use |
/* comment any #defs we dont use */ |
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#define VIDOBJ_START_CODE 0x00000100 /* ..0x0000011f */ |
#define VIDOBJ_START_CODE 0x00000100 /* ..0x0000011f */ |
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#define VIDOBJLAY_START_CODE 0x00000120 /* ..0x0000012f */ |
#define VIDOBJLAY_START_CODE 0x00000120 /* ..0x0000012f */ |
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#define VISOBJSEQ_STOP_CODE 0x000001b1 /* ??? */ |
#define VISOBJSEQ_STOP_CODE 0x000001b1 /* ??? */ |
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#define USERDATA_START_CODE 0x000001b2 |
#define USERDATA_START_CODE 0x000001b2 |
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#define GRPOFVOP_START_CODE 0x000001b3 |
#define GRPOFVOP_START_CODE 0x000001b3 |
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//#define VIDSESERR_ERROR_CODE 0x000001b4 |
/*#define VIDSESERR_ERROR_CODE 0x000001b4 */ |
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#define VISOBJ_START_CODE 0x000001b5 |
#define VISOBJ_START_CODE 0x000001b5 |
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//#define SLICE_START_CODE 0x000001b7 |
/*#define SLICE_START_CODE 0x000001b7 */ |
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//#define EXT_START_CODE 0x000001b8 |
/*#define EXT_START_CODE 0x000001b8 */ |
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#define VISOBJ_TYPE_VIDEO 1 |
#define VISOBJ_TYPE_VIDEO 1 |
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//#define VISOBJ_TYPE_STILLTEXTURE 2 |
/*#define VISOBJ_TYPE_STILLTEXTURE 2 */ |
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//#define VISOBJ_TYPE_MESH 3 |
/*#define VISOBJ_TYPE_MESH 3 */ |
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//#define VISOBJ_TYPE_FBA 4 |
/*#define VISOBJ_TYPE_FBA 4 */ |
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//#define VISOBJ_TYPE_3DMESH 5 |
/*#define VISOBJ_TYPE_3DMESH 5 */ |
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#define VIDOBJLAY_TYPE_SIMPLE 1 |
#define VIDOBJLAY_TYPE_SIMPLE 1 |
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//#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE 2 |
/*#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE 2 */ |
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#define VIDOBJLAY_TYPE_CORE 3 |
#define VIDOBJLAY_TYPE_CORE 3 |
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#define VIDOBJLAY_TYPE_MAIN 4 |
#define VIDOBJLAY_TYPE_MAIN 4 |
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//#define VIDOBJLAY_AR_SQUARE 1 |
/*#define VIDOBJLAY_AR_SQUARE 1 */ |
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//#define VIDOBJLAY_AR_625TYPE_43 2 |
/*#define VIDOBJLAY_AR_625TYPE_43 2 */ |
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//#define VIDOBJLAY_AR_525TYPE_43 3 |
/*#define VIDOBJLAY_AR_525TYPE_43 3 */ |
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//#define VIDOBJLAY_AR_625TYPE_169 8 |
/*#define VIDOBJLAY_AR_625TYPE_169 8 */ |
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//#define VIDOBJLAY_AR_525TYPE_169 9 |
/*#define VIDOBJLAY_AR_525TYPE_169 9 */ |
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#define VIDOBJLAY_AR_EXTPAR 15 |
#define VIDOBJLAY_AR_EXTPAR 15 |
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#define READ_MARKER() BitstreamSkip(bs, 1) |
#define READ_MARKER() BitstreamSkip(bs, 1) |
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#define WRITE_MARKER() BitstreamPutBit(bs, 1) |
#define WRITE_MARKER() BitstreamPutBit(bs, 1) |
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// vop coding types |
/* vop coding types */ |
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// intra, prediction, backward, sprite, not_coded |
/* intra, prediction, backward, sprite, not_coded */ |
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#define I_VOP 0 |
#define I_VOP 0 |
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#define P_VOP 1 |
#define P_VOP 1 |
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#define B_VOP 2 |
#define B_VOP 2 |
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#define S_VOP 3 |
#define S_VOP 3 |
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#define N_VOP 4 |
#define N_VOP 4 |
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// resync-specific |
/* resync-specific */ |
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#define NUMBITS_VP_RESYNC_MARKER 17 |
#define NUMBITS_VP_RESYNC_MARKER 17 |
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#define RESYNC_MARKER 1 |
#define RESYNC_MARKER 1 |
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read_video_packet_header(Bitstream *bs, const int addbits, int * quant); |
read_video_packet_header(Bitstream *bs, const int addbits, int * quant); |
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// header stuff |
/* header stuff */ |
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int BitstreamReadHeaders(Bitstream * bs, |
int BitstreamReadHeaders(Bitstream * bs, |
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DECODER * dec, |
DECODER * dec, |
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uint32_t * rounding, |
uint32_t * rounding, |
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uint32_t length) |
uint32_t length) |
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{ |
{ |
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uint32_t tmp; |
uint32_t tmp; |
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size_t bitpos; |
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ptr_t adjbitstream = (ptr_t)bitstream; |
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bs->start = bs->tail = (uint32_t *) bitstream; |
/* |
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* Start the stream on a uint32_t boundary, by rounding down to the |
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* previous uint32_t and skipping the intervening bytes. |
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*/ |
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bitpos = ((sizeof(uint32_t)-1) & (size_t)bitstream); |
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adjbitstream = adjbitstream - bitpos; |
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bs->start = bs->tail = (uint32_t *) adjbitstream; |
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tmp = *(uint32_t *) bitstream; |
tmp = *bs->start; |
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#ifndef ARCH_IS_BIG_ENDIAN |
#ifndef ARCH_IS_BIG_ENDIAN |
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BSWAP(tmp); |
BSWAP(tmp); |
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#endif |
#endif |
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bs->bufa = tmp; |
bs->bufa = tmp; |
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tmp = *((uint32_t *) bitstream + 1); |
tmp = *(bs->start + 1); |
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#ifndef ARCH_IS_BIG_ENDIAN |
#ifndef ARCH_IS_BIG_ENDIAN |
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BSWAP(tmp); |
BSWAP(tmp); |
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#endif |
#endif |
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bs->bufb = tmp; |
bs->bufb = tmp; |
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bs->buf = 0; |
bs->buf = 0; |
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bs->pos = 0; |
bs->pos = bs->initpos = bitpos*8; |
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bs->length = length; |
bs->length = length; |
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} |
} |
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bs->bufb = tmp; |
bs->bufb = tmp; |
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bs->buf = 0; |
bs->buf = 0; |
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bs->pos = 0; |
bs->pos = bs->initpos; |
222 |
} |
} |
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} |
} |
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// number of bits to next byte alignment |
/* number of bits to next byte alignment */ |
267 |
static uint32_t __inline |
static uint32_t __inline |
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BitstreamNumBitsToByteAlign(Bitstream *bs) |
BitstreamNumBitsToByteAlign(Bitstream *bs) |
269 |
{ |
{ |
272 |
} |
} |
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// show nbits from next byte alignment |
/* show nbits from next byte alignment */ |
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static uint32_t __inline |
static uint32_t __inline |
277 |
BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits) |
BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits) |
278 |
{ |
{ |
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static uint32_t __inline |
static uint32_t __inline |
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BitstreamPos(const Bitstream * const bs) |
BitstreamPos(const Bitstream * const bs) |
313 |
{ |
{ |
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return 8 * ((ptr_t)bs->tail - (ptr_t)bs->start) + bs->pos; |
return((uint32_t)(8*((ptr_t)bs->tail - (ptr_t)bs->start) + bs->pos - bs->initpos)); |
315 |
} |
} |
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static uint32_t __inline |
static uint32_t __inline |
323 |
BitstreamLength(Bitstream * const bs) |
BitstreamLength(Bitstream * const bs) |
324 |
{ |
{ |
325 |
uint32_t len = (ptr_t) bs->tail - (ptr_t) bs->start; |
uint32_t len = (uint32_t)((ptr_t)bs->tail - (ptr_t)bs->start); |
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327 |
if (bs->pos) { |
if (bs->pos) { |
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uint32_t b = bs->buf; |
uint32_t b = bs->buf; |
335 |
len += (bs->pos + 7) / 8; |
len += (bs->pos + 7) / 8; |
336 |
} |
} |
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/* initpos is always on a byte boundary */ |
339 |
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if (bs->initpos) |
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len -= bs->initpos/8; |
341 |
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342 |
return len; |
return len; |
343 |
} |
} |
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363 |
} |
} |
364 |
} |
} |
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/* pad bitstream to the next byte boundary */ |
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static void __inline |
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BitstreamPad(Bitstream * const bs) |
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{ |
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uint32_t remainder = bs->pos % 8; |
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if (remainder) { |
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BitstreamForward(bs, 8 - remainder); |
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} |
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} |
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/* read n bits from bitstream */ |
/* read n bits from bitstream */ |
367 |
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368 |
static uint32_t __inline |
static uint32_t __inline |
425 |
} |
} |
426 |
} |
} |
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static const int stuffing_codes[8] = |
429 |
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{ |
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/* nbits stuffing code */ |
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0, /* 1 0 */ |
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1, /* 2 01 */ |
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3, /* 3 011 */ |
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7, /* 4 0111 */ |
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0xf, /* 5 01111 */ |
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0x1f, /* 6 011111 */ |
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0x3f, /* 7 0111111 */ |
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0x7f, /* 8 01111111 */ |
439 |
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}; |
440 |
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/* pad bitstream to the next byte boundary */ |
442 |
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443 |
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static void __inline |
444 |
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BitstreamPad(Bitstream * const bs) |
445 |
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{ |
446 |
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int bits = 8 - (bs->pos % 8); |
447 |
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if (bits < 8) |
448 |
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BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); |
449 |
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} |
450 |
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/* |
452 |
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* pad bitstream to the next byte boundary |
453 |
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* alway pad: even if currently at the byte boundary |
454 |
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*/ |
455 |
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456 |
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static void __inline |
457 |
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BitstreamPadAlways(Bitstream * const bs) |
458 |
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{ |
459 |
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int bits = 8 - (bs->pos % 8); |
460 |
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BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); |
461 |
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} |
462 |
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463 |
#endif /* _BITSTREAM_H_ */ |
#endif /* _BITSTREAM_H_ */ |