[cvs] / xvidcore / src / bitstream / bitstream.h Repository:
ViewVC logotype

Diff of /xvidcore/src/bitstream/bitstream.h

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 1.6, Wed Jun 12 20:38:40 2002 UTC revision 1.14, Sun Nov 17 00:57:57 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@xvid.org>
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 file is part of XviD, a free MPEG-4 video encoder/decoder
9    *  would be at such party's own risk.  The original developer of this        *   *
10    *  software module and his/her company, and subsequent editors and their     *   *  XviD is free software; you can redistribute it and/or modify it
11    *  companies, will have no liability for use of this software or             *   *  under the terms of the GNU General Public License as published by
12    *  modifications or derivatives thereof.                                     *   *  the Free Software Foundation; either version 2 of the License, or
13    *                                                                            *   *  (at your option) any later version.
14    *  XviD is free software; you can redistribute it and/or modify it           *   *
15    *  under the terms of the GNU General Public License as published by         *   *  This program is distributed in the hope that it will be useful,
16    *  the Free Software Foundation; either version 2 of the License, or         *   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
17    *  (at your option) any later version.                                       *   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18    *                                                                            *   *  GNU General Public License for more details.
19    *  XviD is distributed in the hope that it will be useful, but               *   *
20    *  WITHOUT ANY WARRANTY; without even the implied warranty of                *   *  You should have received a copy of the GNU General Public License
21    *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *   *  along with this program; if not, write to the Free Software
22    *  GNU General Public License for more details.                              *   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
23    *                                                                            *   *
24    *  You should have received a copy of the GNU General Public License         *   *  Under section 8 of the GNU General Public License, the copyright
25    *  along with this program; if not, write to the Free Software               *   *  holders of XVID explicitly forbid distribution in the following
26    *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA  *   *  countries:
27    *                                                                            *   *
28    ******************************************************************************/   *    - Japan
29     *    - United States of America
30   /******************************************************************************   *
31    *                                                                            *   *  Linking XviD statically or dynamically with other modules is making a
32    *  bitstream.h                                                               *   *  combined work based on XviD.  Thus, the terms and conditions of the
33    *                                                                            *   *  GNU General Public License cover the whole combination.
34    *  Copyright (C) 2001 - Peter Ross <pross@cs.rmit.edu.au>                    *   *
35    *                                                                            *   *  As a special exception, the copyright holders of XviD give you
36    *  For more information visit the XviD homepage: http://www.xvid.org         *   *  permission to link XviD with independent modules that communicate with
37    *                                                                            *   *  XviD solely through the VFW1.1 and DShow interfaces, regardless of the
38    ******************************************************************************/   *  license terms of these independent modules, and to copy and distribute
39     *  the resulting combined work under terms of your choice, provided that
40   /******************************************************************************   *  every copy of the combined work is accompanied by a complete copy of
41    *                                                                                                                                                        *   *  the source code of XviD (the version of XviD used to produce the
42    *  Revision history:                                                         *   *  combined work), being distributed under the terms of the GNU General
43    *                                                                            *   *  Public License plus this exception.  An independent module is a module
44    *  26.03.2002 interlacing support - modified putvol/vopheaders paramters   *  which is not derived from or based on XviD.
45    *  04.03.2002 putbits speedup (Isibaar)                                      *   *
46    *  03.03.2002 merged BITREADER and BITWRITER (Isibaar)                       *   *  Note that people who make modified versions of XviD are not obligated
47    *      16.12.2001     inital version                                                     *   *  to grant this special exception for their modified versions; it is
48    *                                                                                                                                                        *   *  their choice whether to do so.  The GNU General Public License gives
49    ******************************************************************************/   *  permission to release a modified version without this exception; this
50     *  exception also makes it possible to release a modified version which
51     *  carries forward this exception.
52     *
53     * $Id$
54     *
55     ****************************************************************************/
56    
57  #ifndef _BITSTREAM_H_  #ifndef _BITSTREAM_H_
58  #define _BITSTREAM_H_  #define _BITSTREAM_H_
# Line 55  Line 61 
61  #include "../decoder.h"  #include "../decoder.h"
62  #include "../encoder.h"  #include "../encoder.h"
63    
64    
65    /*****************************************************************************
66     * Constants
67     ****************************************************************************/
68    
69  // comment any #defs we dont use  // comment any #defs we dont use
70    
71  #define VIDOBJ_START_CODE               0x00000100      /* ..0x0000011f  */  #define VIDOBJ_START_CODE               0x00000100      /* ..0x0000011f  */
# Line 110  Line 121 
121  #define S_VOP   3  #define S_VOP   3
122  #define N_VOP   4  #define N_VOP   4
123    
124    // resync-specific
125    #define NUMBITS_VP_RESYNC_MARKER  17
126    #define RESYNC_MARKER 1
127    
128    
129    /*****************************************************************************
130     * Prototypes
131     ****************************************************************************/
132    
133    int
134    read_video_packet_header(Bitstream *bs, const int addbits, int * quant);
135    
136    
137  // header stuff  // header stuff
138  int BitstreamReadHeaders(Bitstream * bs,  int BitstreamReadHeaders(Bitstream * bs,
# Line 127  Line 150 
150    
151  void BitstreamWriteVopHeader(Bitstream * const bs,  void BitstreamWriteVopHeader(Bitstream * const bs,
152                                                           const MBParam * pParam,                                                           const MBParam * pParam,
153                                                           const FRAMEINFO * frame);                                                           const FRAMEINFO * frame,
154                                                             int vop_coded);
155    
156    /*****************************************************************************
157     * Inlined functions
158     ****************************************************************************/
159    
160  /* initialise bitstream structure */  /* initialise bitstream structure */
161    
# Line 204  Line 232 
232    
233  /* skip n bits forward in bitstream */  /* skip n bits forward in bitstream */
234    
235  static __inline void  static void __inline
236  BitstreamSkip(Bitstream * const bs,  BitstreamSkip(Bitstream * const bs,
237                            const uint32_t bits)                            const uint32_t bits)
238  {  {
# Line 225  Line 253 
253  }  }
254    
255    
256    // number of bits to next byte alignment
257    static uint32_t __inline
258    BitstreamNumBitsToByteAlign(Bitstream *bs)
259    {
260            uint32_t n = (32 - bs->pos) % 8;
261            return n == 0 ? 8 : n;
262    }
263    
264    
265    // show nbits from next byte alignment
266    static uint32_t __inline
267    BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)
268    {
269            int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs);
270            int nbit = (bits + bspos) - 32;
271    
272            if (bspos >= 32) {
273                    return bs->bufb >> (32 - nbit);
274            } else  if (nbit > 0) {
275                    return ((bs->bufa & (0xffffffff >> bspos)) << nbit) | (bs->
276                                                                                                                                     bufb >> (32 -
277                                                                                                                                                      nbit));
278            } else {
279                    return (bs->bufa & (0xffffffff >> bspos)) >> (32 - bspos - bits);
280            }
281    
282    }
283    
284    
285    
286  /* move forward to the next byte boundary */  /* move forward to the next byte boundary */
287    
288  static __inline void  static void __inline
289  BitstreamByteAlign(Bitstream * const bs)  BitstreamByteAlign(Bitstream * const bs)
290  {  {
291          uint32_t remainder = bs->pos % 8;          uint32_t remainder = bs->pos % 8;
# Line 243  Line 301 
301  static uint32_t __inline  static uint32_t __inline
302  BitstreamPos(const Bitstream * const bs)  BitstreamPos(const Bitstream * const bs)
303  {  {
304          return 8 * ((uint32_t) bs->tail - (uint32_t) bs->start) + bs->pos;          return 8 * ((ptr_t)bs->tail - (ptr_t)bs->start) + bs->pos;
305  }  }
306    
307    
# Line 254  Line 312 
312  static uint32_t __inline  static uint32_t __inline
313  BitstreamLength(Bitstream * const bs)  BitstreamLength(Bitstream * const bs)
314  {  {
315          uint32_t len = (uint32_t) bs->tail - (uint32_t) bs->start;          uint32_t len = (ptr_t) bs->tail - (ptr_t) bs->start;
316    
317          if (bs->pos) {          if (bs->pos) {
318                  uint32_t b = bs->buf;                  uint32_t b = bs->buf;

Legend:
Removed from v.1.6  
changed lines
  Added in v.1.14

No admin address has been configured
ViewVC Help
Powered by ViewVC 1.0.4