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/****************************************************************************** |
/***************************************************************************** |
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* * |
* |
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* This file is part of XviD, a free MPEG-4 video encoder/decoder * |
* XVID MPEG-4 VIDEO CODEC |
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* * |
* - Bitstream reader/writer inlined functions and constants- |
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* XviD is an implementation of a part of one or more MPEG-4 Video tools * |
* |
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* as specified in ISO/IEC 14496-2 standard. Those intending to use this * |
* Copyright (C) 2001-2003 - Peter Ross <pross@xvid.org> |
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* software module in hardware or software products are advised that its * |
* |
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* use may infringe existing patents or copyrights, and any such use * |
* This file is part of XviD, a free MPEG-4 video encoder/decoder |
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* would be at such party's own risk. The original developer of this * |
* |
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* software module and his/her company, and subsequent editors and their * |
* XviD is free software; you can redistribute it and/or modify it |
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* companies, will have no liability for use of this software or * |
* under the terms of the GNU General Public License as published by |
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* modifications or derivatives thereof. * |
* the Free Software Foundation; either version 2 of the License, or |
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* * |
* (at your option) any later version. |
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* XviD is free software; you can redistribute it and/or modify it * |
* |
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* under the terms of the GNU General Public License as published by * |
* This program is distributed in the hope that it will be useful, |
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* the Free Software Foundation; either version 2 of the License, or * |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* (at your option) any later version. * |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* * |
* GNU General Public License for more details. |
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* XviD is distributed in the hope that it will be useful, but * |
* |
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* WITHOUT ANY WARRANTY; without even the implied warranty of * |
* You should have received a copy of the GNU General Public License |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
* along with this program; if not, write to the Free Software |
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* GNU General Public License for more details. * |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* * |
* |
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* You should have received a copy of the GNU General Public License * |
* $Id$ |
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* 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 * |
****************************************************************************/ |
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* * |
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******************************************************************************/ |
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/****************************************************************************** |
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* * |
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* bitstream.h * |
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* * |
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* Copyright (C) 2001 - Peter Ross <pross@cs.rmit.edu.au> * |
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* * |
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* For more information visit the XviD homepage: http://www.xvid.org * |
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* * |
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******************************************************************************/ |
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/****************************************************************************** |
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* * |
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* Revision history: * |
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* * |
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* 28.06.2002 addded BitstreamNumBitsToByteAlign() * |
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* BitstreamShowBitsFromByteAlign() * |
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* 26.03.2002 interlacing support - modified putvol/vopheaders paramters * |
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* 04.03.2002 putbits speedup (Isibaar) * |
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* 03.03.2002 merged BITREADER and BITWRITER (Isibaar) * |
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* 16.12.2001 inital version * |
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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 "../decoder.h" |
#include "../decoder.h" |
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#include "../encoder.h" |
#include "../encoder.h" |
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// comment any #defs we dont use |
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/* start codes */ |
/***************************************************************************** |
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* Constants |
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****************************************************************************/ |
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/* 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 VOP_START_CODE 0x000001b6 |
#define VOP_START_CODE 0x000001b6 |
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//#define STUFFING_START_CODE 0x000001c3 |
/*#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 |
/*#define VIDOBJLAY_TYPE_NBIT 5 */ |
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//#define VIDOBJLAY_TYPE_ANIM_TEXT 6 |
/*#define VIDOBJLAY_TYPE_ANIM_TEXT 6 */ |
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//#define VIDOBJLAY_TYPE_ANIM_MESH 7 |
/*#define VIDOBJLAY_TYPE_ANIM_MESH 7 */ |
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//#define VIDOBJLAY_TYPE_SIMPLE_FACE 8 |
/*#define VIDOBJLAY_TYPE_SIMPLE_FACE 8 */ |
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//#define VIDOBJLAY_TYPE_STILL_SCALABLE 9 |
/*#define VIDOBJLAY_TYPE_STILL_SCALABLE 9 */ |
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#define VIDOBJLAY_TYPE_ART_SIMPLE 10 |
#define VIDOBJLAY_TYPE_ART_SIMPLE 10 |
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//#define VIDOBJLAY_TYPE_CORE_SCALABLE 11 |
/*#define VIDOBJLAY_TYPE_CORE_SCALABLE 11 */ |
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#define VIDOBJLAY_TYPE_ACE 12 |
#define VIDOBJLAY_TYPE_ACE 12 |
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//#define VIDOBJLAY_TYPE_SIMPLE_FBA 13 |
/*#define VIDOBJLAY_TYPE_SIMPLE_FBA 13 */ |
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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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/***************************************************************************** |
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* Prototypes |
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****************************************************************************/ |
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int read_video_packet_header(Bitstream *bs, |
int read_video_packet_header(Bitstream *bs, |
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DECODER * dec, |
DECODER * dec, |
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const int addbits, |
const int addbits, |
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int * fcode_backward, |
int * fcode_backward, |
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int * intra_dc_threshold); |
int * intra_dc_threshold); |
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/* header stuff */ |
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// 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; |
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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 __inline uint32_t |
static __inline uint32_t |
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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 __inline uint32_t |
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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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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/* 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] = |
static const int stuffing_codes[8] = |
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{ |
{ |
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/* nbits stuffing code */ |
/* nbits stuffing code */ |
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{ |
{ |
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int bits = 8 - (bs->pos % 8); |
int bits = 8 - (bs->pos % 8); |
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if (bits < 8) |
if (bits < 8) |
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{ |
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BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); |
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 */ |
* 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 |
static void __inline |
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BitstreamPadAlways(Bitstream * const bs) |
BitstreamPadAlways(Bitstream * const bs) |
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BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); |
BitstreamPutBits(bs, stuffing_codes[bits - 1], bits); |
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} |
} |
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#endif /* _BITSTREAM_H_ */ |
#endif /* _BITSTREAM_H_ */ |