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revision 1.17, Sat Feb 15 15:22:18 2003 UTC revision 1.18, Fri Apr 4 22:16:15 2003 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) 2001-2003 - 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         *   * $Id$
25    *  along with this program; if not, write to the Free Software               *   *
26    *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA  *   ****************************************************************************/
   *                                                                            *  
   ******************************************************************************/  
   
  /******************************************************************************  
   *                                                                            *  
   *  bitstream.h                                                               *  
   *                                                                            *  
   *  Copyright (C) 2001 - Peter Ross <pross@cs.rmit.edu.au>                    *  
   *                                                                            *  
   *  For more information visit the XviD homepage: http://www.xvid.org         *  
   *                                                                            *  
   ******************************************************************************/  
   
  /******************************************************************************  
   *                                                                                                                                                        *  
   *  Revision history:                                                         *  
   *                                                                            *  
   *  28.06.2002 addded BitstreamNumBitsToByteAlign()                           *  
   *                    BitstreamShowBitsFromByteAlign()                        *  
   *  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                                                     *  
   *                                                                                                                                                        *  
   ******************************************************************************/  
27    
28  #ifndef _BITSTREAM_H_  #ifndef _BITSTREAM_H_
29  #define _BITSTREAM_H_  #define _BITSTREAM_H_
# Line 57  Line 32 
32  #include "../decoder.h"  #include "../decoder.h"
33  #include "../encoder.h"  #include "../encoder.h"
34    
 // comment any #defs we dont use  
35    
36  /* start codes */  /*****************************************************************************
37     * Constants
38     ****************************************************************************/
39    
40    /* comment any #defs we dont use */
41    
42  #define VIDOBJ_START_CODE               0x00000100      /* ..0x0000011f  */  #define VIDOBJ_START_CODE               0x00000100      /* ..0x0000011f  */
43  #define VIDOBJLAY_START_CODE    0x00000120      /* ..0x0000012f */  #define VIDOBJLAY_START_CODE    0x00000120      /* ..0x0000012f */
# Line 67  Line 45 
45  #define VISOBJSEQ_STOP_CODE             0x000001b1      /* ??? */  #define VISOBJSEQ_STOP_CODE             0x000001b1      /* ??? */
46  #define USERDATA_START_CODE             0x000001b2  #define USERDATA_START_CODE             0x000001b2
47  #define GRPOFVOP_START_CODE             0x000001b3  #define GRPOFVOP_START_CODE             0x000001b3
48  //#define VIDSESERR_ERROR_CODE  0x000001b4  /*#define VIDSESERR_ERROR_CODE  0x000001b4 */
49  #define VISOBJ_START_CODE               0x000001b5  #define VISOBJ_START_CODE               0x000001b5
50  #define VOP_START_CODE                  0x000001b6  #define VOP_START_CODE                  0x000001b6
51  //#define STUFFING_START_CODE   0x000001c3  /*#define STUFFING_START_CODE   0x000001c3 */
52    
53    
54  #define VISOBJ_TYPE_VIDEO                               1  #define VISOBJ_TYPE_VIDEO                               1
55  //#define VISOBJ_TYPE_STILLTEXTURE      2  /*#define VISOBJ_TYPE_STILLTEXTURE      2 */
56  //#define VISOBJ_TYPE_MESH              3  /*#define VISOBJ_TYPE_MESH              3 */
57  //#define VISOBJ_TYPE_FBA               4  /*#define VISOBJ_TYPE_FBA               4 */
58  //#define VISOBJ_TYPE_3DMESH            5  /*#define VISOBJ_TYPE_3DMESH            5 */
59    
60    
61  #define VIDOBJLAY_TYPE_SIMPLE                   1  #define VIDOBJLAY_TYPE_SIMPLE                   1
62  //#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE    2  /*#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE    2 */
63  #define VIDOBJLAY_TYPE_CORE                             3  #define VIDOBJLAY_TYPE_CORE                             3
64  #define VIDOBJLAY_TYPE_MAIN                             4  #define VIDOBJLAY_TYPE_MAIN                             4
65  //#define VIDOBJLAY_TYPE_NBIT                           5  /*#define VIDOBJLAY_TYPE_NBIT                           5 */
66  //#define VIDOBJLAY_TYPE_ANIM_TEXT                      6  /*#define VIDOBJLAY_TYPE_ANIM_TEXT                      6 */
67  //#define VIDOBJLAY_TYPE_ANIM_MESH                      7  /*#define VIDOBJLAY_TYPE_ANIM_MESH                      7 */
68  //#define VIDOBJLAY_TYPE_SIMPLE_FACE            8  /*#define VIDOBJLAY_TYPE_SIMPLE_FACE            8 */
69  //#define VIDOBJLAY_TYPE_STILL_SCALABLE         9  /*#define VIDOBJLAY_TYPE_STILL_SCALABLE         9 */
70  #define VIDOBJLAY_TYPE_ART_SIMPLE               10  #define VIDOBJLAY_TYPE_ART_SIMPLE               10
71  //#define VIDOBJLAY_TYPE_CORE_SCALABLE          11  /*#define VIDOBJLAY_TYPE_CORE_SCALABLE          11 */
72  #define VIDOBJLAY_TYPE_ACE                              12  #define VIDOBJLAY_TYPE_ACE                              12
73  //#define VIDOBJLAY_TYPE_SIMPLE_FBA                     13  /*#define VIDOBJLAY_TYPE_SIMPLE_FBA                     13 */
74    
75    
76  //#define VIDOBJLAY_AR_SQUARE           1  /*#define VIDOBJLAY_AR_SQUARE           1 */
77  //#define VIDOBJLAY_AR_625TYPE_43       2  /*#define VIDOBJLAY_AR_625TYPE_43       2 */
78  //#define VIDOBJLAY_AR_525TYPE_43       3  /*#define VIDOBJLAY_AR_525TYPE_43       3 */
79  //#define VIDOBJLAY_AR_625TYPE_169      8  /*#define VIDOBJLAY_AR_625TYPE_169      8 */
80  //#define VIDOBJLAY_AR_525TYPE_169      9  /*#define VIDOBJLAY_AR_525TYPE_169      9 */
81  #define VIDOBJLAY_AR_EXTPAR                             15  #define VIDOBJLAY_AR_EXTPAR                             15
82    
83    
# Line 118  Line 96 
96  #define READ_MARKER()   BitstreamSkip(bs, 1)  #define READ_MARKER()   BitstreamSkip(bs, 1)
97  #define WRITE_MARKER()  BitstreamPutBit(bs, 1)  #define WRITE_MARKER()  BitstreamPutBit(bs, 1)
98    
99  // vop coding types  /* vop coding types  */
100  // intra, prediction, backward, sprite, not_coded  /* intra, prediction, backward, sprite, not_coded */
101  #define I_VOP   0  #define I_VOP   0
102  #define P_VOP   1  #define P_VOP   1
103  #define B_VOP   2  #define B_VOP   2
104  #define S_VOP   3  #define S_VOP   3
105  #define N_VOP   4  #define N_VOP   4
106    
107  // resync-specific  /* resync-specific */
108  #define NUMBITS_VP_RESYNC_MARKER  17  #define NUMBITS_VP_RESYNC_MARKER  17
109  #define RESYNC_MARKER 1  #define RESYNC_MARKER 1
110    
111    
112    /*****************************************************************************
113     * Prototypes
114     ****************************************************************************/
115    
116  int read_video_packet_header(Bitstream *bs,  int read_video_packet_header(Bitstream *bs,
117                                                  DECODER * dec,                                                  DECODER * dec,
118                                                  const int addbits,                                                  const int addbits,
# Line 139  Line 121 
121                                                  int  * fcode_backward,                                                  int  * fcode_backward,
122                                                  int * intra_dc_threshold);                                                  int * intra_dc_threshold);
123    
124    /* header stuff */
 // header stuff  
125  int BitstreamReadHeaders(Bitstream * bs,  int BitstreamReadHeaders(Bitstream * bs,
126                                                   DECODER * dec,                                                   DECODER * dec,
127                                                   uint32_t * rounding,                                                   uint32_t * rounding,
# Line 173  Line 154 
154                            uint32_t length)                            uint32_t length)
155  {  {
156          uint32_t tmp;          uint32_t tmp;
157            size_t bitpos;
158            ptr_t adjbitstream = (ptr_t)bitstream;
159    
160          bs->start = bs->tail = (uint32_t *) bitstream;          /*
161             * Start the stream on a uint32_t boundary, by rounding down to the
162             * previous uint32_t and skipping the intervening bytes.
163             */
164            bitpos = ((sizeof(uint32_t)-1) & (size_t)bitstream);
165            adjbitstream = adjbitstream - bitpos;
166            bs->start = bs->tail = (uint32_t *) adjbitstream;
167    
168          tmp = *(uint32_t *) bitstream;          tmp = *bs->start;
169  #ifndef ARCH_IS_BIG_ENDIAN  #ifndef ARCH_IS_BIG_ENDIAN
170          BSWAP(tmp);          BSWAP(tmp);
171  #endif  #endif
172          bs->bufa = tmp;          bs->bufa = tmp;
173    
174          tmp = *((uint32_t *) bitstream + 1);          tmp = *(bs->start + 1);
175  #ifndef ARCH_IS_BIG_ENDIAN  #ifndef ARCH_IS_BIG_ENDIAN
176          BSWAP(tmp);          BSWAP(tmp);
177  #endif  #endif
178          bs->bufb = tmp;          bs->bufb = tmp;
179    
180          bs->buf = 0;          bs->buf = 0;
181          bs->pos = 0;          bs->pos = bs->initpos = bitpos*8;
182          bs->length = length;          bs->length = length;
183  }  }
184    
# Line 216  Line 205 
205          bs->bufb = tmp;          bs->bufb = tmp;
206    
207          bs->buf = 0;          bs->buf = 0;
208          bs->pos = 0;          bs->pos = bs->initpos;
209  }  }
210    
211    
# Line 261  Line 250 
250  }  }
251    
252    
253  // number of bits to next byte alignment  /* number of bits to next byte alignment */
254  static __inline uint32_t  static __inline uint32_t
255  BitstreamNumBitsToByteAlign(Bitstream *bs)  BitstreamNumBitsToByteAlign(Bitstream *bs)
256  {  {
# Line 270  Line 259 
259  }  }
260    
261    
262  // show nbits from next byte alignment  /* show nbits from next byte alignment */
263  static __inline uint32_t  static __inline uint32_t
264  BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)  BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)
265  {  {
# Line 309  Line 298 
298  static uint32_t __inline  static uint32_t __inline
299  BitstreamPos(const Bitstream * const bs)  BitstreamPos(const Bitstream * const bs)
300  {  {
301          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));
302  }  }
303    
304    
305  /*      flush the bitstream & return length (unit bytes)  /*
306          NOTE: assumes no futher bitstream functions will be called.   * flush the bitstream & return length (unit bytes)
307     * NOTE: assumes no futher bitstream functions will be called.
308   */   */
309    
310  static uint32_t __inline  static uint32_t __inline
311  BitstreamLength(Bitstream * const bs)  BitstreamLength(Bitstream * const bs)
312  {  {
313          uint32_t len = (ptr_t) bs->tail - (ptr_t) bs->start;          uint32_t len = (uint32_t)((ptr_t)bs->tail - (ptr_t)bs->start);
314    
315          if (bs->pos) {          if (bs->pos) {
316                  uint32_t b = bs->buf;                  uint32_t b = bs->buf;
# Line 333  Line 323 
323                  len += (bs->pos + 7) / 8;                  len += (bs->pos + 7) / 8;
324          }          }
325    
326            /* initpos is always on a byte boundary */
327            if (bs->initpos)
328                    len -= bs->initpos/8;
329    
330          return len;          return len;
331  }  }
332    
# Line 357  Line 351 
351          }          }
352  }  }
353    
   
354  /* read n bits from bitstream */  /* read n bits from bitstream */
355    
356  static uint32_t __inline  static uint32_t __inline
# Line 420  Line 413 
413          }          }
414  }  }
415    
   
416  static const int stuffing_codes[8] =  static const int stuffing_codes[8] =
417  {  {
418                  /* nbits     stuffing code */                  /* nbits     stuffing code */
# Line 441  Line 433 
433  {  {
434          int bits = 8 - (bs->pos % 8);          int bits = 8 - (bs->pos % 8);
435          if (bits < 8)          if (bits < 8)
         {  
436                  BitstreamPutBits(bs, stuffing_codes[bits - 1], bits);                  BitstreamPutBits(bs, stuffing_codes[bits - 1], bits);
437          }          }
 }  
438    
439    
440  /* pad bitstream to the next byte boundary  /*
441     alway pad: even if currently at the byte boundary */   * pad bitstream to the next byte boundary
442     * alway pad: even if currently at the byte boundary
443     */
444    
445  static void __inline  static void __inline
446  BitstreamPadAlways(Bitstream * const bs)  BitstreamPadAlways(Bitstream * const bs)
# Line 457  Line 449 
449          BitstreamPutBits(bs, stuffing_codes[bits - 1], bits);          BitstreamPutBits(bs, stuffing_codes[bits - 1], bits);
450  }  }
451    
   
452  #endif                                                  /* _BITSTREAM_H_ */  #endif                                                  /* _BITSTREAM_H_ */

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