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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) 2001-2002 - 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 |
* This file is part of XviD, a free MPEG-4 video encoder/decoder |
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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 |
* XviD is free software; you can redistribute it and/or modify it |
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* it under the terms of the GNU General Public License as published by |
* under the terms of the GNU General Public License as published by |
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* the Free Software Foundation ; either version 2 of the License, or |
* the Free Software Foundation ; either version 2 of the License, or |
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* (at your option) any later version. |
* (at your option) any later version. |
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* |
* |
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* along with this program ; if not, write to the Free Software |
* along with this program ; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
* |
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* Under section 8 of the GNU General Public License, the copyright |
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* holders of XVID explicitly forbid distribution in the following |
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* countries: |
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* |
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* - Japan |
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* - United States of America |
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* |
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* Linking XviD statically or dynamically with other modules is making a |
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* combined work based on XviD. Thus, the terms and conditions of the |
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* GNU General Public License cover the whole combination. |
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* |
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* As a special exception, the copyright holders of XviD give you |
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* permission to link XviD with independent modules that communicate with |
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* XviD solely through the VFW1.1 and DShow interfaces, regardless of the |
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* license terms of these independent modules, and to copy and distribute |
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* the resulting combined work under terms of your choice, provided that |
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* every copy of the combined work is accompanied by a complete copy of |
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* the source code of XviD (the version of XviD used to produce the |
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* combined work), being distributed under the terms of the GNU General |
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* Public License plus this exception. An independent module is a module |
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* which is not derived from or based on XviD. |
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* |
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* Note that people who make modified versions of XviD are not obligated |
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* to grant this special exception for their modified versions; it is |
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* their choice whether to do so. The GNU General Public License gives |
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* permission to release a modified version without this exception; this |
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* exception also makes it possible to release a modified version which |
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* carries forward this exception. |
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* |
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* $Id$ |
* $Id$ |
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* |
* |
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****************************************************************************/ |
****************************************************************************/ |
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#ifndef _BITSTREAM_H_ |
#ifndef _BITSTREAM_H_ |
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#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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const FRAMEINFO * frame, |
const FRAMEINFO * frame, |
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int vop_coded); |
int vop_coded); |
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void BitstreamWriteUserData(Bitstream * const bs, |
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uint8_t * data, |
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const int length); |
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/***************************************************************************** |
/***************************************************************************** |
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* Inlined functions |
* Inlined functions |
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****************************************************************************/ |
****************************************************************************/ |
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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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} |
} |
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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 uint32_t __inline |
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BitstreamNumBitsToByteAlign(Bitstream *bs) |
BitstreamNumBitsToByteAlign(Bitstream *bs) |
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{ |
{ |
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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 uint32_t __inline |
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BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits) |
BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits) |
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{ |
{ |
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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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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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