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* XVID MPEG-4 VIDEO CODEC |
* XVID MPEG-4 VIDEO CODEC |
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* - Bitstream reader/writer inlined functions and constants- |
* - Bitstream reader/writer inlined functions and constants- |
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* |
* |
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* Copyright (C) 2001-2002 - Peter Ross <pross@cs.rmit.edu.au> |
* Copyright (C) 2001-2003 Peter Ross <pross@xvid.org> |
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* |
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* This program is an implementation of a part of one or more MPEG-4 |
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* Video tools as specified in ISO/IEC 14496-2 standard. Those intending |
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* to use this software module in hardware or software products are |
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* advised that its use may infringe existing patents or copyrights, and |
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* any such use would be at such party's own risk. The original |
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* developer of this software module and his/her company, and subsequent |
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* editors and their companies, will have no liability for use of this |
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* software or modifications or derivatives thereof. |
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* |
* |
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* This program is free software ; you can redistribute it and/or modify |
* This program is free software ; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
* it under the terms of the GNU General Public License as published by |
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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 VOP_START_CODE 0x000001b6 |
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//#define EXT_START_CODE 0x000001b8 |
/*#define STUFFING_START_CODE 0x000001c3 */ |
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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_TYPE_NBIT 5 */ |
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/*#define VIDOBJLAY_TYPE_ANIM_TEXT 6 */ |
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//#define VIDOBJLAY_AR_SQUARE 1 |
/*#define VIDOBJLAY_TYPE_ANIM_MESH 7 */ |
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//#define VIDOBJLAY_AR_625TYPE_43 2 |
/*#define VIDOBJLAY_TYPE_SIMPLE_FACE 8 */ |
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//#define VIDOBJLAY_AR_525TYPE_43 3 |
/*#define VIDOBJLAY_TYPE_STILL_SCALABLE 9 */ |
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//#define VIDOBJLAY_AR_625TYPE_169 8 |
#define VIDOBJLAY_TYPE_ART_SIMPLE 10 |
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//#define VIDOBJLAY_AR_525TYPE_169 9 |
/*#define VIDOBJLAY_TYPE_CORE_SCALABLE 11 */ |
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/*#define VIDOBJLAY_TYPE_ACE 12 */ |
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/*#define VIDOBJLAY_TYPE_ADVANCED_SCALABLE_TEXTURE 13 */ |
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/*#define VIDOBJLAY_TYPE_SIMPLE_FBA 14 */ |
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/*#define VIDEOJLAY_TYPE_SIMPLE_STUDIO 15*/ |
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/*#define VIDEOJLAY_TYPE_CORE_STUDIO 16*/ |
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#define VIDOBJLAY_TYPE_ASP 17 |
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/*#define VIDOBJLAY_TYPE_FGS 18*/ |
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/*#define VIDOBJLAY_AR_SQUARE 1 */ |
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/*#define VIDOBJLAY_AR_625TYPE_43 2 */ |
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/*#define VIDOBJLAY_AR_525TYPE_43 3 */ |
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/*#define VIDOBJLAY_AR_625TYPE_169 8 */ |
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/*#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 VIDOBJLAY_SHAPE_BINARY_ONLY 2 |
#define VIDOBJLAY_SHAPE_BINARY_ONLY 2 |
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#define VIDOBJLAY_SHAPE_GRAYSCALE 3 |
#define VIDOBJLAY_SHAPE_GRAYSCALE 3 |
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#define VO_START_CODE 0x8 |
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#define VOL_START_CODE 0x12 |
#define SPRITE_NONE 0 |
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#define VOP_START_CODE 0x1b6 |
#define SPRITE_STATIC 1 |
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#define SPRITE_GMC 2 |
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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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* Prototypes |
* Prototypes |
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****************************************************************************/ |
****************************************************************************/ |
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int |
int read_video_packet_header(Bitstream *bs, |
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read_video_packet_header(Bitstream *bs, const int addbits, int * quant); |
DECODER * dec, |
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const int addbits, |
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int *quant, |
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int *fcode_forward, |
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int *fcode_backward, |
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int *intra_dc_threshold); |
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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 * quant, |
uint32_t * quant, |
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uint32_t * fcode_forward, |
uint32_t * fcode_forward, |
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uint32_t * fcode_backward, |
uint32_t * fcode_backward, |
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uint32_t * intra_dc_threshold); |
uint32_t * intra_dc_threshold, |
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WARPPOINTS * gmc_warp); |
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void BitstreamWriteVolHeader(Bitstream * const bs, |
void BitstreamWriteVolHeader(Bitstream * const bs, |
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const MBParam * pParam, |
const MBParam * pParam, |
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const FRAMEINFO * frame); |
const FRAMEINFO * const frame); |
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void BitstreamWriteVopHeader(Bitstream * const bs, |
void BitstreamWriteVopHeader(Bitstream * const bs, |
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const MBParam * pParam, |
const MBParam * pParam, |
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const FRAMEINFO * frame, |
const FRAMEINFO * const frame, |
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int vop_coded); |
int vop_coded, |
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unsigned int quant); |
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void BitstreamWriteUserData(Bitstream * const bs, |
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const char *data, |
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const unsigned int length); |
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/***************************************************************************** |
void |
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* Inlined functions |
BitstreamWriteEndOfSequence(Bitstream * const bs); |
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****************************************************************************/ |
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void |
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BitstreamWriteGroupOfVopHeader(Bitstream * const bs, |
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const MBParam * pParam, |
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uint32_t is_closed_gov); |
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void write_video_packet_header(Bitstream * const bs, |
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const MBParam * pParam, |
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const FRAMEINFO * const frame, |
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int mbnum); |
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/* initialise bitstream structure */ |
/* initialise bitstream structure */ |
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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; |
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} |
} |
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/* skip n bits forward in bitstream */ |
/* skip n bits forward in bitstream */ |
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static void __inline |
static __inline void |
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BitstreamSkip(Bitstream * const bs, |
BitstreamSkip(Bitstream * const bs, |
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const uint32_t bits) |
const uint32_t bits) |
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{ |
{ |
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} |
} |
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// number of bits to next byte alignment |
/* number of bits to next byte alignment */ |
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static uint32_t __inline |
static __inline uint32_t |
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BitstreamNumBitsToByteAlign(Bitstream *bs) |
BitstreamNumBitsToByteAlign(Bitstream *bs) |
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{ |
{ |
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uint32_t n = (32 - bs->pos) % 8; |
uint32_t n = (32 - bs->pos) % 8; |
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} |
} |
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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 __inline uint32_t |
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BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits) |
BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits) |
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{ |
{ |
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int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs); |
int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs); |
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/* move forward to the next byte boundary */ |
/* move forward to the next byte boundary */ |
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static void __inline |
static __inline void |
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BitstreamByteAlign(Bitstream * const bs) |
BitstreamByteAlign(Bitstream * const bs) |
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{ |
{ |
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uint32_t remainder = bs->pos % 8; |
uint32_t remainder = bs->pos % 8; |
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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) |
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{ |
{ |
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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)); |
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} |
} |
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/* flush the bitstream & return length (unit bytes) |
/* |
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NOTE: assumes no futher bitstream functions will be called. |
* flush the bitstream & return length (unit bytes) |
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* NOTE: assumes no futher bitstream functions will be called. |
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*/ |
*/ |
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static uint32_t __inline |
static uint32_t __inline |
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BitstreamLength(Bitstream * const bs) |
BitstreamLength(Bitstream * const bs) |
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{ |
{ |
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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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if (bs->pos) { |
if (bs->pos) { |
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uint32_t b = bs->buf; |
uint32_t b = bs->buf; |
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len += (bs->pos + 7) / 8; |
len += (bs->pos + 7) / 8; |
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} |
} |
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/* initpos is always on a byte boundary */ |
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if (bs->initpos) |
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len -= bs->initpos/8; |
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return len; |
return len; |
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} |
} |
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} |
} |
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} |
} |
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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 */ |
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static uint32_t __inline |
static uint32_t __inline |
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} |
} |
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} |
} |
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static const int stuffing_codes[8] = |
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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 */ |
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}; |
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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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int bits = 8 - (bs->pos % 8); |
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if (bits < 8) |
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BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); |
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} |
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/* |
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* pad bitstream to the next byte boundary |
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* alway pad: even if currently at the byte boundary |
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*/ |
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static void __inline |
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BitstreamPadAlways(Bitstream * const bs) |
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{ |
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int bits = 8 - (bs->pos % 8); |
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BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); |
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} |
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#endif /* _BITSTREAM_H_ */ |
#endif /* _BITSTREAM_H_ */ |