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Revision 469 - (download) (annotate)
Tue Sep 10 22:52:13 2002 UTC (17 years ago) by edgomez
Original Path: trunk/xvidcore/src/bitstream/bitstream.h
File size: 9184 byte(s)
Added headers, removed unused code
/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - Bitstream reader/writer inlined functions and constants-
 *
 *  Copyright (C) 2001-2002 - Peter Ross <pross@cs.rmit.edu.au>
 *
 *  This program is an implementation of a part of one or more MPEG-4
 *  Video tools as specified in ISO/IEC 14496-2 standard.  Those intending
 *  to use this software module in hardware or software products are
 *  advised that its use may infringe existing patents or copyrights, and
 *  any such use would be at such party's own risk.  The original
 *  developer of this software module and his/her company, and subsequent
 *  editors and their companies, will have no liability for use of this
 *  software or modifications or derivatives thereof.
 *
 *  This program is free software ; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation ; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY ; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program ; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * $Id: bitstream.h,v 1.12 2002-09-10 22:52:12 edgomez Exp $
 *
 ****************************************************************************/

#ifndef _BITSTREAM_H_
#define _BITSTREAM_H_

#include "../portab.h"
#include "../decoder.h"
#include "../encoder.h"


/*****************************************************************************
 * Constants
 ****************************************************************************/

// comment any #defs we dont use

#define VIDOBJ_START_CODE		0x00000100	/* ..0x0000011f  */
#define VIDOBJLAY_START_CODE	0x00000120	/* ..0x0000012f */
#define VISOBJSEQ_START_CODE	0x000001b0
#define VISOBJSEQ_STOP_CODE		0x000001b1	/* ??? */
#define USERDATA_START_CODE		0x000001b2
#define GRPOFVOP_START_CODE		0x000001b3
//#define VIDSESERR_ERROR_CODE  0x000001b4
#define VISOBJ_START_CODE		0x000001b5
//#define SLICE_START_CODE      0x000001b7
//#define EXT_START_CODE        0x000001b8


#define VISOBJ_TYPE_VIDEO				1
//#define VISOBJ_TYPE_STILLTEXTURE      2
//#define VISOBJ_TYPE_MESH              3
//#define VISOBJ_TYPE_FBA               4
//#define VISOBJ_TYPE_3DMESH            5


#define VIDOBJLAY_TYPE_SIMPLE			1
//#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE    2
#define VIDOBJLAY_TYPE_CORE				3
#define VIDOBJLAY_TYPE_MAIN				4


//#define VIDOBJLAY_AR_SQUARE           1
//#define VIDOBJLAY_AR_625TYPE_43       2
//#define VIDOBJLAY_AR_525TYPE_43       3
//#define VIDOBJLAY_AR_625TYPE_169      8
//#define VIDOBJLAY_AR_525TYPE_169      9
#define VIDOBJLAY_AR_EXTPAR				15


#define VIDOBJLAY_SHAPE_RECTANGULAR		0
#define VIDOBJLAY_SHAPE_BINARY			1
#define VIDOBJLAY_SHAPE_BINARY_ONLY		2
#define VIDOBJLAY_SHAPE_GRAYSCALE		3

#define VO_START_CODE	0x8
#define VOL_START_CODE	0x12
#define VOP_START_CODE	0x1b6

#define READ_MARKER()	BitstreamSkip(bs, 1)
#define WRITE_MARKER()	BitstreamPutBit(bs, 1)

// vop coding types 
// intra, prediction, backward, sprite, not_coded
#define I_VOP	0
#define P_VOP	1
#define B_VOP	2
#define S_VOP	3
#define N_VOP	4

// resync-specific
#define NUMBITS_VP_RESYNC_MARKER  17
#define RESYNC_MARKER 1


/*****************************************************************************
 * Prototypes
 ****************************************************************************/

int
read_video_packet_header(Bitstream *bs, const int addbits, int * quant);


// header stuff
int BitstreamReadHeaders(Bitstream * bs,
						 DECODER * dec,
						 uint32_t * rounding,
						 uint32_t * quant,
						 uint32_t * fcode_forward,
						 uint32_t * fcode_backward,
						 uint32_t * intra_dc_threshold);


void BitstreamWriteVolHeader(Bitstream * const bs,
							 const MBParam * pParam,
							 const FRAMEINFO * frame);

void BitstreamWriteVopHeader(Bitstream * const bs,
							 const MBParam * pParam,
							 const FRAMEINFO * frame,
							 int vop_coded);

/*****************************************************************************
 * Inlined functions
 ****************************************************************************/

/* initialise bitstream structure */

static void __inline
BitstreamInit(Bitstream * const bs,
			  void *const bitstream,
			  uint32_t length)
{
	uint32_t tmp;

	bs->start = bs->tail = (uint32_t *) bitstream;

	tmp = *(uint32_t *) bitstream;
#ifndef ARCH_IS_BIG_ENDIAN
	BSWAP(tmp);
#endif
	bs->bufa = tmp;

	tmp = *((uint32_t *) bitstream + 1);
#ifndef ARCH_IS_BIG_ENDIAN
	BSWAP(tmp);
#endif
	bs->bufb = tmp;

	bs->buf = 0;
	bs->pos = 0;
	bs->length = length;
}


/* reset bitstream state */

static void __inline
BitstreamReset(Bitstream * const bs)
{
	uint32_t tmp;

	bs->tail = bs->start;

	tmp = *bs->start;
#ifndef ARCH_IS_BIG_ENDIAN
	BSWAP(tmp);
#endif
	bs->bufa = tmp;

	tmp = *(bs->start + 1);
#ifndef ARCH_IS_BIG_ENDIAN
	BSWAP(tmp);
#endif
	bs->bufb = tmp;

	bs->buf = 0;
	bs->pos = 0;
}


/* reads n bits from bitstream without changing the stream pos */

static uint32_t __inline
BitstreamShowBits(Bitstream * const bs,
				  const uint32_t bits)
{
	int nbit = (bits + bs->pos) - 32;

	if (nbit > 0) {
		return ((bs->bufa & (0xffffffff >> bs->pos)) << nbit) | (bs->
																 bufb >> (32 -
																		  nbit));
	} else {
		return (bs->bufa & (0xffffffff >> bs->pos)) >> (32 - bs->pos - bits);
	}
}


/* skip n bits forward in bitstream */

static void __inline
BitstreamSkip(Bitstream * const bs,
			  const uint32_t bits)
{
	bs->pos += bits;

	if (bs->pos >= 32) {
		uint32_t tmp;

		bs->bufa = bs->bufb;
		tmp = *((uint32_t *) bs->tail + 2);
#ifndef ARCH_IS_BIG_ENDIAN
		BSWAP(tmp);
#endif
		bs->bufb = tmp;
		bs->tail++;
		bs->pos -= 32;
	}
}


// number of bits to next byte alignment
static uint32_t __inline
BitstreamNumBitsToByteAlign(Bitstream *bs)
{
	uint32_t n = (32 - bs->pos) % 8;
	return n == 0 ? 8 : n;
}


// show nbits from next byte alignment
static uint32_t __inline
BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)
{
	int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs);
	int nbit = (bits + bspos) - 32;

	if (bspos >= 32) {
		return bs->bufb >> (32 - nbit);
	} else	if (nbit > 0) {
		return ((bs->bufa & (0xffffffff >> bspos)) << nbit) | (bs->
																 bufb >> (32 -
																		  nbit));
	} else {
		return (bs->bufa & (0xffffffff >> bspos)) >> (32 - bspos - bits);
	}

}



/* move forward to the next byte boundary */

static void __inline
BitstreamByteAlign(Bitstream * const bs)
{
	uint32_t remainder = bs->pos % 8;

	if (remainder) {
		BitstreamSkip(bs, 8 - remainder);
	}
}


/* bitstream length (unit bits) */

static uint32_t __inline
BitstreamPos(const Bitstream * const bs)
{
	return 8 * ((ptr_t)bs->tail - (ptr_t)bs->start) + bs->pos;
}


/*	flush the bitstream & return length (unit bytes)
	NOTE: assumes no futher bitstream functions will be called.
 */

static uint32_t __inline
BitstreamLength(Bitstream * const bs)
{
	uint32_t len = (ptr_t) bs->tail - (ptr_t) bs->start;

	if (bs->pos) {
		uint32_t b = bs->buf;

#ifndef ARCH_IS_BIG_ENDIAN
		BSWAP(b);
#endif
		*bs->tail = b;

		len += (bs->pos + 7) / 8;
	}

	return len;
}


/* move bitstream position forward by n bits and write out buffer if needed */

static void __inline
BitstreamForward(Bitstream * const bs,
				 const uint32_t bits)
{
	bs->pos += bits;

	if (bs->pos >= 32) {
		uint32_t b = bs->buf;

#ifndef ARCH_IS_BIG_ENDIAN
		BSWAP(b);
#endif
		*bs->tail++ = b;
		bs->buf = 0;
		bs->pos -= 32;
	}
}


/* pad bitstream to the next byte boundary */

static void __inline
BitstreamPad(Bitstream * const bs)
{
	uint32_t remainder = bs->pos % 8;

	if (remainder) {
		BitstreamForward(bs, 8 - remainder);
	}
}


/* read n bits from bitstream */

static uint32_t __inline
BitstreamGetBits(Bitstream * const bs,
				 const uint32_t n)
{
	uint32_t ret = BitstreamShowBits(bs, n);

	BitstreamSkip(bs, n);
	return ret;
}


/* read single bit from bitstream */

static uint32_t __inline
BitstreamGetBit(Bitstream * const bs)
{
	return BitstreamGetBits(bs, 1);
}


/* write single bit to bitstream */

static void __inline
BitstreamPutBit(Bitstream * const bs,
				const uint32_t bit)
{
	if (bit)
		bs->buf |= (0x80000000 >> bs->pos);

	BitstreamForward(bs, 1);
}


/* write n bits to bitstream */

static void __inline
BitstreamPutBits(Bitstream * const bs,
				 const uint32_t value,
				 const uint32_t size)
{
	uint32_t shift = 32 - bs->pos - size;

	if (shift <= 32) {
		bs->buf |= value << shift;
		BitstreamForward(bs, size);
	} else {
		uint32_t remainder;

		shift = size - (32 - bs->pos);
		bs->buf |= value >> shift;
		BitstreamForward(bs, size - shift);
		remainder = shift;

		shift = 32 - shift;

		bs->buf |= value << shift;
		BitstreamForward(bs, remainder);
	}
}

#endif /* _BITSTREAM_H_ */

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