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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 * |
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* * |
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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 * |
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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 * |
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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 * |
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* companies, will have no liability for use of this software or * |
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* modifications or derivatives thereof. * |
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* * |
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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 * |
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* 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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* * |
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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 * |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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* GNU General Public License for more details. * |
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* * |
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* You should have received a copy of the GNU General Public License * |
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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.c * |
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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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* 14.04.2002 bframe encoding |
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* 08.03.2002 initial version; isibaar * |
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* * |
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******************************************************************************/ |
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#include <stdlib.h> |
#include <stdlib.h> |
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#include "../portab.h" |
#include "../portab.h" |
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#include "bitstream.h" |
#include "bitstream.h" |
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uint32_t run = l; |
uint32_t run = l; |
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if((abs(level) <= max_level_ptr[run]) && |
if((abs(level) <= max_level_ptr[run]) && |
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(run <= max_run_ptr[abs(level)])) { // level < max_level and run < max_run |
(run <= (uint32_t)max_run_ptr[abs(level)])) { // level < max_level and run < max_run |
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vlc[intra]->code = 0; |
vlc[intra]->code = 0; |
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vlc[intra]->len = 0; |
vlc[intra]->len = 0; |
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level += max_level_ptr[run]; |
level += max_level_ptr[run]; |
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if((abs(level) <= max_level_ptr[run]) && |
if((abs(level) <= max_level_ptr[run]) && |
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(run <= max_run_ptr[abs(level)])) { |
(run <= (uint32_t) max_run_ptr[abs(level)])) { |
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vlc[intra]->code = 0x06; |
vlc[intra]->code = 0x06; |
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vlc[intra]->len = 8; |
vlc[intra]->len = 8; |
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run -= max_run_ptr[abs(level)] + 1; // and change run |
run -= max_run_ptr[abs(level)] + 1; // and change run |
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if((abs(level) <= max_level_ptr[run]) && |
if((abs(level) <= max_level_ptr[run]) && |
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(run <= max_run_ptr[abs(level)])) { |
(run <= (uint32_t) max_run_ptr[abs(level)])) { |
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vlc[intra]->code = 0x0e; |
vlc[intra]->code = 0x0e; |
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vlc[intra]->len = 9; |
vlc[intra]->len = 9; |
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} |
} |
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/*************************************************************** |
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* bframe encoding start |
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***************************************************************/ |
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/* |
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mbtype |
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0 1b direct(h263) mvdb |
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1 01b interpolate mc+q dbquant, mvdf, mvdb |
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2 001b backward mc+q dbquant, mvdb |
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3 0001b forward mc+q dbquant, mvdf |
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*/ |
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void put_bvop_mbtype(Bitstream * bs, int value) |
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{ |
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switch(value) |
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{ |
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case 0 : BitstreamPutBit(bs, 1); |
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return; |
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case 1 : BitstreamPutBit(bs, 0); |
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BitstreamPutBit(bs, 1); |
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return; |
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case 2 : BitstreamPutBit(bs, 0); |
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BitstreamPutBit(bs, 0); |
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BitstreamPutBit(bs, 1); |
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return; |
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case 3 : BitstreamPutBit(bs, 0); |
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BitstreamPutBit(bs, 0); |
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BitstreamPutBit(bs, 0); |
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BitstreamPutBit(bs, 1); |
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return; |
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default : ; // invalid! |
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} |
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} |
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/* |
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dbquant |
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-2 10b |
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0 0b |
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+2 11b |
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*/ |
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void put_bvop_dbquant(Bitstream *bs, int value) |
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{ |
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switch (value) |
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{ |
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case 0 : BitstreamPutBit(bs, 0); |
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return; |
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case -2 : BitstreamPutBit(bs, 1); |
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BitstreamPutBit(bs, 0); |
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return; |
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case 2 : BitstreamPutBit(bs, 1); |
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BitstreamPutBit(bs, 1); |
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return; |
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default : ; // invalid |
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} |
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} |
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void MBCodingBVOP(const MACROBLOCK * mb, |
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const int16_t qcoeff[6*64], |
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const int16_t fcode, |
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const int16_t bcode, |
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Bitstream * bs, |
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Statistics * pStat) |
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{ |
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int i; |
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/* ------------------------------------------------------------------ |
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when a block is skipped it is decoded DIRECT(0,) |
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hence are interpolated from forward & backward frames |
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------------------------------------------------------------------ */ |
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if (mb->mode == 5) |
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{ |
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BitstreamPutBit(bs, 1); // skipped |
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return; |
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} |
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BitstreamPutBit(bs, 0); // not skipped |
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if (mb->cbp == 0) |
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{ |
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BitstreamPutBit(bs, 1); // cbp == 0 |
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} |
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else |
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{ |
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BitstreamPutBit(bs, 0); // cbp == xxx |
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} |
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put_bvop_mbtype(bs, mb->mode); |
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if (mb->cbp) |
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{ |
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BitstreamPutBits(bs, mb->cbp, 6); |
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} |
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if (mb->mode != MODE_DIRECT && mb->cbp != 0) |
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{ |
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put_bvop_dbquant(bs, 0); // todo: mb->dquant = 0 |
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} |
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if (mb->mode == MODE_INTERPOLATE || mb->mode == MODE_FORWARD) |
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{ |
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CodeVector(bs, mb->pmvs[0].x, fcode, pStat); |
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CodeVector(bs, mb->pmvs[0].y, fcode, pStat); |
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} |
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if (mb->mode == MODE_INTERPOLATE || mb->mode == MODE_BACKWARD) |
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{ |
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CodeVector(bs, mb->b_pmvs[0].x, bcode, pStat); |
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CodeVector(bs, mb->b_pmvs[0].y, bcode, pStat); |
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} |
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if (mb->mode == MODE_DIRECT) |
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{ |
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// TODO: direct |
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} |
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for (i = 0; i < 6; i++) |
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{ |
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if (mb->cbp & (1 << (5 - i))) |
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{ |
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CodeCoeff(bs, &qcoeff[i*64], inter_table, scan_tables[0], 0); |
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} |
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} |
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} |
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/*************************************************************** |
/*************************************************************** |
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* decoding stuff starts here * |
* decoding stuff starts here * |