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revision 1.6, Wed Jun 12 20:38:40 2002 UTC revision 1.12, Tue Sep 10 22:52:12 2002 UTC
# Line 1  Line 1 
1   /******************************************************************************  /*****************************************************************************
2    *                                                                            *   *
3    *  This file is part of XviD, a free MPEG-4 video encoder/decoder            *   *  XVID MPEG-4 VIDEO CODEC
4    *                                                                            *   *  - Bitstream reader/writer inlined functions and constants-
5    *  XviD is an implementation of a part of one or more MPEG-4 Video tools     *   *
6    *  as specified in ISO/IEC 14496-2 standard.  Those intending to use this    *   *  Copyright (C) 2001-2002 - Peter Ross <pross@cs.rmit.edu.au>
7    *  software module in hardware or software products are advised that its     *   *
8    *  use may infringe existing patents or copyrights, and any such use         *   *  This program is an implementation of a part of one or more MPEG-4
9    *  would be at such party's own risk.  The original developer of this        *   *  Video tools as specified in ISO/IEC 14496-2 standard.  Those intending
10    *  software module and his/her company, and subsequent editors and their     *   *  to use this software module in hardware or software products are
11    *  companies, will have no liability for use of this software or             *   *  advised that its use may infringe existing patents or copyrights, and
12    *  modifications or derivatives thereof.                                     *   *  any such use would be at such party's own risk.  The original
13    *                                                                            *   *  developer of this software module and his/her company, and subsequent
14    *  XviD is free software; you can redistribute it and/or modify it           *   *  editors and their companies, will have no liability for use of this
15    *  under the terms of the GNU General Public License as published by         *   *  software or modifications or derivatives thereof.
16    *  the Free Software Foundation; either version 2 of the License, or         *   *
17    *  (at your option) any later version.                                       *   *  This program is free software ; you can redistribute it and/or modify
18    *                                                                            *   *  it under the terms of the GNU General Public License as published by
19    *  XviD is distributed in the hope that it will be useful, but               *   *  the Free Software Foundation ; either version 2 of the License, or
20    *  WITHOUT ANY WARRANTY; without even the implied warranty of                *   *  (at your option) any later version.
21    *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *   *
22    *  GNU General Public License for more details.                              *   *  This program is distributed in the hope that it will be useful,
23    *                                                                            *   *  but WITHOUT ANY WARRANTY ; without even the implied warranty of
24    *  You should have received a copy of the GNU General Public License         *   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
25    *  along with this program; if not, write to the Free Software               *   *  GNU General Public License for more details.
26    *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA  *   *
27    *                                                                            *   *  You should have received a copy of the GNU General Public License
28    ******************************************************************************/   *  along with this program ; if not, write to the Free Software
29     *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
30   /******************************************************************************   *
31    *                                                                            *   * $Id$
32    *  bitstream.h                                                               *   *
33    *                                                                            *   ****************************************************************************/
   *  Copyright (C) 2001 - Peter Ross <pross@cs.rmit.edu.au>                    *  
   *                                                                            *  
   *  For more information visit the XviD homepage: http://www.xvid.org         *  
   *                                                                            *  
   ******************************************************************************/  
   
  /******************************************************************************  
   *                                                                                                                                                        *  
   *  Revision history:                                                         *  
   *                                                                            *  
   *  26.03.2002 interlacing support - modified putvol/vopheaders paramters  
   *  04.03.2002 putbits speedup (Isibaar)                                      *  
   *  03.03.2002 merged BITREADER and BITWRITER (Isibaar)                       *  
   *      16.12.2001     inital version                                                     *  
   *                                                                                                                                                        *  
   ******************************************************************************/  
34    
35  #ifndef _BITSTREAM_H_  #ifndef _BITSTREAM_H_
36  #define _BITSTREAM_H_  #define _BITSTREAM_H_
# Line 55  Line 39 
39  #include "../decoder.h"  #include "../decoder.h"
40  #include "../encoder.h"  #include "../encoder.h"
41    
42    
43    /*****************************************************************************
44     * Constants
45     ****************************************************************************/
46    
47  // comment any #defs we dont use  // comment any #defs we dont use
48    
49  #define VIDOBJ_START_CODE               0x00000100      /* ..0x0000011f  */  #define VIDOBJ_START_CODE               0x00000100      /* ..0x0000011f  */
# Line 110  Line 99 
99  #define S_VOP   3  #define S_VOP   3
100  #define N_VOP   4  #define N_VOP   4
101    
102    // resync-specific
103    #define NUMBITS_VP_RESYNC_MARKER  17
104    #define RESYNC_MARKER 1
105    
106    
107    /*****************************************************************************
108     * Prototypes
109     ****************************************************************************/
110    
111    int
112    read_video_packet_header(Bitstream *bs, const int addbits, int * quant);
113    
114    
115  // header stuff  // header stuff
116  int BitstreamReadHeaders(Bitstream * bs,  int BitstreamReadHeaders(Bitstream * bs,
# Line 127  Line 128 
128    
129  void BitstreamWriteVopHeader(Bitstream * const bs,  void BitstreamWriteVopHeader(Bitstream * const bs,
130                                                           const MBParam * pParam,                                                           const MBParam * pParam,
131                                                           const FRAMEINFO * frame);                                                           const FRAMEINFO * frame,
132                                                             int vop_coded);
133    
134    /*****************************************************************************
135     * Inlined functions
136     ****************************************************************************/
137    
138  /* initialise bitstream structure */  /* initialise bitstream structure */
139    
# Line 204  Line 210 
210    
211  /* skip n bits forward in bitstream */  /* skip n bits forward in bitstream */
212    
213  static __inline void  static void __inline
214  BitstreamSkip(Bitstream * const bs,  BitstreamSkip(Bitstream * const bs,
215                            const uint32_t bits)                            const uint32_t bits)
216  {  {
# Line 225  Line 231 
231  }  }
232    
233    
234    // number of bits to next byte alignment
235    static uint32_t __inline
236    BitstreamNumBitsToByteAlign(Bitstream *bs)
237    {
238            uint32_t n = (32 - bs->pos) % 8;
239            return n == 0 ? 8 : n;
240    }
241    
242    
243    // show nbits from next byte alignment
244    static uint32_t __inline
245    BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)
246    {
247            int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs);
248            int nbit = (bits + bspos) - 32;
249    
250            if (bspos >= 32) {
251                    return bs->bufb >> (32 - nbit);
252            } else  if (nbit > 0) {
253                    return ((bs->bufa & (0xffffffff >> bspos)) << nbit) | (bs->
254                                                                                                                                     bufb >> (32 -
255                                                                                                                                                      nbit));
256            } else {
257                    return (bs->bufa & (0xffffffff >> bspos)) >> (32 - bspos - bits);
258            }
259    
260    }
261    
262    
263    
264  /* move forward to the next byte boundary */  /* move forward to the next byte boundary */
265    
266  static __inline void  static void __inline
267  BitstreamByteAlign(Bitstream * const bs)  BitstreamByteAlign(Bitstream * const bs)
268  {  {
269          uint32_t remainder = bs->pos % 8;          uint32_t remainder = bs->pos % 8;
# Line 243  Line 279 
279  static uint32_t __inline  static uint32_t __inline
280  BitstreamPos(const Bitstream * const bs)  BitstreamPos(const Bitstream * const bs)
281  {  {
282          return 8 * ((uint32_t) bs->tail - (uint32_t) bs->start) + bs->pos;          return 8 * ((ptr_t)bs->tail - (ptr_t)bs->start) + bs->pos;
283  }  }
284    
285    
# Line 254  Line 290 
290  static uint32_t __inline  static uint32_t __inline
291  BitstreamLength(Bitstream * const bs)  BitstreamLength(Bitstream * const bs)
292  {  {
293          uint32_t len = (uint32_t) bs->tail - (uint32_t) bs->start;          uint32_t len = (ptr_t) bs->tail - (ptr_t) bs->start;
294    
295          if (bs->pos) {          if (bs->pos) {
296                  uint32_t b = bs->buf;                  uint32_t b = bs->buf;

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