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revision 1.14, Sun Nov 17 00:57:57 2002 UTC revision 1.17.2.4, Mon May 12 12:31:05 2003 UTC
# Line 3  Line 3 
3   *  XVID MPEG-4 VIDEO CODEC   *  XVID MPEG-4 VIDEO CODEC
4   *  - Bitstream reader/writer inlined functions and constants-   *  - Bitstream reader/writer inlined functions and constants-
5   *   *
6   *  Copyright (C) 2001-2002 - Peter Ross <pross@xvid.org>   *  Copyright (C) 2001-2003 - Peter Ross <pross@xvid.org>
7   *   *
8   *  This file is part of XviD, a free MPEG-4 video encoder/decoder   *  This file is part of XviD, a free MPEG-4 video encoder/decoder
9   *   *
# Line 21  Line 21 
21   *  along with this program; if not, write to the Free Software   *  along with this program; if not, write to the Free Software
22   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA   *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
23   *   *
  *  Under section 8 of the GNU General Public License, the copyright  
  *  holders of XVID explicitly forbid distribution in the following  
  *  countries:  
  *  
  *    - Japan  
  *    - United States of America  
  *  
  *  Linking XviD statically or dynamically with other modules is making a  
  *  combined work based on XviD.  Thus, the terms and conditions of the  
  *  GNU General Public License cover the whole combination.  
  *  
  *  As a special exception, the copyright holders of XviD give you  
  *  permission to link XviD with independent modules that communicate with  
  *  XviD solely through the VFW1.1 and DShow interfaces, regardless of the  
  *  license terms of these independent modules, and to copy and distribute  
  *  the resulting combined work under terms of your choice, provided that  
  *  every copy of the combined work is accompanied by a complete copy of  
  *  the source code of XviD (the version of XviD used to produce the  
  *  combined work), being distributed under the terms of the GNU General  
  *  Public License plus this exception.  An independent module is a module  
  *  which is not derived from or based on XviD.  
  *  
  *  Note that people who make modified versions of XviD are not obligated  
  *  to grant this special exception for their modified versions; it is  
  *  their choice whether to do so.  The GNU General Public License gives  
  *  permission to release a modified version without this exception; this  
  *  exception also makes it possible to release a modified version which  
  *  carries forward this exception.  
  *  
24   * $Id$   * $Id$
25   *   *
26   ****************************************************************************/   ****************************************************************************/
# Line 66  Line 37 
37   * Constants   * Constants
38   ****************************************************************************/   ****************************************************************************/
39    
40  // comment any #defs we dont use  /* 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 74  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 SLICE_START_CODE      0x000001b7  #define VOP_START_CODE                  0x000001b6
51  //#define EXT_START_CODE        0x000001b8  /*#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 */
66    /*#define VIDOBJLAY_TYPE_ANIM_TEXT                      6 */
67  //#define VIDOBJLAY_AR_SQUARE           1  /*#define VIDOBJLAY_TYPE_ANIM_MESH                      7 */
68  //#define VIDOBJLAY_AR_625TYPE_43       2  /*#define VIDOBJLAY_TYPE_SIMPLE_FACE            8 */
69  //#define VIDOBJLAY_AR_525TYPE_43       3  /*#define VIDOBJLAY_TYPE_STILL_SCALABLE         9 */
70  //#define VIDOBJLAY_AR_625TYPE_169      8  #define VIDOBJLAY_TYPE_ART_SIMPLE               10
71  //#define VIDOBJLAY_AR_525TYPE_169      9  /*#define VIDOBJLAY_TYPE_CORE_SCALABLE          11 */
72    /*#define VIDOBJLAY_TYPE_ACE                            12 */
73    /*#define VIDOBJLAY_TYPE_ADVANCED_SCALABLE_TEXTURE 13 */
74    /*#define VIDOBJLAY_TYPE_SIMPLE_FBA                     14 */
75    /*#define VIDEOJLAY_TYPE_SIMPLE_STUDIO    15*/
76    /*#define VIDEOJLAY_TYPE_CORE_STUDIO      16*/
77    #define VIDOBJLAY_TYPE_ASP              17
78    /*#define VIDOBJLAY_TYPE_FGS              18*/
79    
80    
81    /*#define VIDOBJLAY_AR_SQUARE           1 */
82    /*#define VIDOBJLAY_AR_625TYPE_43       2 */
83    /*#define VIDOBJLAY_AR_525TYPE_43       3 */
84    /*#define VIDOBJLAY_AR_625TYPE_169      8 */
85    /*#define VIDOBJLAY_AR_525TYPE_169      9 */
86  #define VIDOBJLAY_AR_EXTPAR                             15  #define VIDOBJLAY_AR_EXTPAR                             15
87    
88    
# Line 106  Line 91 
91  #define VIDOBJLAY_SHAPE_BINARY_ONLY             2  #define VIDOBJLAY_SHAPE_BINARY_ONLY             2
92  #define VIDOBJLAY_SHAPE_GRAYSCALE               3  #define VIDOBJLAY_SHAPE_GRAYSCALE               3
93    
94  #define VO_START_CODE   0x8  
95  #define VOL_START_CODE  0x12  #define SPRITE_NONE             0
96  #define VOP_START_CODE  0x1b6  #define SPRITE_STATIC   1
97    #define SPRITE_GMC              2
98    
99    
100    
101  #define READ_MARKER()   BitstreamSkip(bs, 1)  #define READ_MARKER()   BitstreamSkip(bs, 1)
102  #define WRITE_MARKER()  BitstreamPutBit(bs, 1)  #define WRITE_MARKER()  BitstreamPutBit(bs, 1)
103    
104  // vop coding types  /* vop coding types  */
105  // intra, prediction, backward, sprite, not_coded  /* intra, prediction, backward, sprite, not_coded */
106  #define I_VOP   0  #define I_VOP   0
107  #define P_VOP   1  #define P_VOP   1
108  #define B_VOP   2  #define B_VOP   2
109  #define S_VOP   3  #define S_VOP   3
110  #define N_VOP   4  #define N_VOP   4
111    
112  // resync-specific  /* resync-specific */
113  #define NUMBITS_VP_RESYNC_MARKER  17  #define NUMBITS_VP_RESYNC_MARKER  17
114  #define RESYNC_MARKER 1  #define RESYNC_MARKER 1
115    
# Line 130  Line 118 
118   * Prototypes   * Prototypes
119   ****************************************************************************/   ****************************************************************************/
120    
121  int  int read_video_packet_header(Bitstream *bs,
122  read_video_packet_header(Bitstream *bs, const int addbits, int * quant);                                                           DECODER * dec,
123                                                             const int addbits,
124                                                             int *quant,
125                                                             int *fcode_forward,
126                                                             int *fcode_backward,
127                                                             int *intra_dc_threshold);
128    
129  // header stuff  /* header stuff */
130  int BitstreamReadHeaders(Bitstream * bs,  int BitstreamReadHeaders(Bitstream * bs,
131                                                   DECODER * dec,                                                   DECODER * dec,
132                                                   uint32_t * rounding,                                                   uint32_t * rounding,
133                                                     uint32_t * reduced_resolution,
134                                                   uint32_t * quant,                                                   uint32_t * quant,
135                                                   uint32_t * fcode_forward,                                                   uint32_t * fcode_forward,
136                                                   uint32_t * fcode_backward,                                                   uint32_t * fcode_backward,
137                                                   uint32_t * intra_dc_threshold);                                                   uint32_t * intra_dc_threshold,
138                                                     WARPPOINTS * gmc_warp);
139    
140    
141  void BitstreamWriteVolHeader(Bitstream * const bs,  void BitstreamWriteVolHeader(Bitstream * const bs,
142                                                           const MBParam * pParam,                                                           const MBParam * pParam);
                                                          const FRAMEINFO * frame);  
143    
144  void BitstreamWriteVopHeader(Bitstream * const bs,  void BitstreamWriteVopHeader(Bitstream * const bs,
145                                                           const MBParam * pParam,                                                           const MBParam * pParam,
146                                                           const FRAMEINFO * frame,                                                           const FRAMEINFO * const frame,
147                                                           int vop_coded);                                                           int vop_coded);
148    
149  /*****************************************************************************  void BitstreamWriteUserData(Bitstream * const bs,
150   * Inlined functions                                                          uint8_t * data,
151   ****************************************************************************/                                                          const int length);
152    
153  /* initialise bitstream structure */  /* initialise bitstream structure */
154    
# Line 165  Line 158 
158                            uint32_t length)                            uint32_t length)
159  {  {
160          uint32_t tmp;          uint32_t tmp;
161            size_t bitpos;
162            ptr_t adjbitstream = (ptr_t)bitstream;
163    
164          bs->start = bs->tail = (uint32_t *) bitstream;          /*
165             * Start the stream on a uint32_t boundary, by rounding down to the
166             * previous uint32_t and skipping the intervening bytes.
167             */
168            bitpos = ((sizeof(uint32_t)-1) & (size_t)bitstream);
169            adjbitstream = adjbitstream - bitpos;
170            bs->start = bs->tail = (uint32_t *) adjbitstream;
171    
172          tmp = *(uint32_t *) bitstream;          tmp = *bs->start;
173  #ifndef ARCH_IS_BIG_ENDIAN  #ifndef ARCH_IS_BIG_ENDIAN
174          BSWAP(tmp);          BSWAP(tmp);
175  #endif  #endif
176          bs->bufa = tmp;          bs->bufa = tmp;
177    
178          tmp = *((uint32_t *) bitstream + 1);          tmp = *(bs->start + 1);
179  #ifndef ARCH_IS_BIG_ENDIAN  #ifndef ARCH_IS_BIG_ENDIAN
180          BSWAP(tmp);          BSWAP(tmp);
181  #endif  #endif
182          bs->bufb = tmp;          bs->bufb = tmp;
183    
184          bs->buf = 0;          bs->buf = 0;
185          bs->pos = 0;          bs->pos = bs->initpos = bitpos*8;
186          bs->length = length;          bs->length = length;
187  }  }
188    
# Line 208  Line 209 
209          bs->bufb = tmp;          bs->bufb = tmp;
210    
211          bs->buf = 0;          bs->buf = 0;
212          bs->pos = 0;          bs->pos = bs->initpos;
213  }  }
214    
215    
# Line 232  Line 233 
233    
234  /* skip n bits forward in bitstream */  /* skip n bits forward in bitstream */
235    
236  static void __inline  static __inline void
237  BitstreamSkip(Bitstream * const bs,  BitstreamSkip(Bitstream * const bs,
238                            const uint32_t bits)                            const uint32_t bits)
239  {  {
# Line 253  Line 254 
254  }  }
255    
256    
257  // number of bits to next byte alignment  /* number of bits to next byte alignment */
258  static uint32_t __inline  static __inline uint32_t
259  BitstreamNumBitsToByteAlign(Bitstream *bs)  BitstreamNumBitsToByteAlign(Bitstream *bs)
260  {  {
261          uint32_t n = (32 - bs->pos) % 8;          uint32_t n = (32 - bs->pos) % 8;
# Line 262  Line 263 
263  }  }
264    
265    
266  // show nbits from next byte alignment  /* show nbits from next byte alignment */
267  static uint32_t __inline  static __inline uint32_t
268  BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)  BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)
269  {  {
270          int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs);          int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs);
# Line 285  Line 286 
286    
287  /* move forward to the next byte boundary */  /* move forward to the next byte boundary */
288    
289  static void __inline  static __inline void
290  BitstreamByteAlign(Bitstream * const bs)  BitstreamByteAlign(Bitstream * const bs)
291  {  {
292          uint32_t remainder = bs->pos % 8;          uint32_t remainder = bs->pos % 8;
# Line 301  Line 302 
302  static uint32_t __inline  static uint32_t __inline
303  BitstreamPos(const Bitstream * const bs)  BitstreamPos(const Bitstream * const bs)
304  {  {
305          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));
306  }  }
307    
308    
309  /*      flush the bitstream & return length (unit bytes)  /*
310          NOTE: assumes no futher bitstream functions will be called.   * flush the bitstream & return length (unit bytes)
311     * NOTE: assumes no futher bitstream functions will be called.
312   */   */
313    
314  static uint32_t __inline  static uint32_t __inline
315  BitstreamLength(Bitstream * const bs)  BitstreamLength(Bitstream * const bs)
316  {  {
317          uint32_t len = (ptr_t) bs->tail - (ptr_t) bs->start;          uint32_t len = (uint32_t)((ptr_t)bs->tail - (ptr_t)bs->start);
318    
319          if (bs->pos) {          if (bs->pos) {
320                  uint32_t b = bs->buf;                  uint32_t b = bs->buf;
# Line 325  Line 327 
327                  len += (bs->pos + 7) / 8;                  len += (bs->pos + 7) / 8;
328          }          }
329    
330            /* initpos is always on a byte boundary */
331            if (bs->initpos)
332                    len -= bs->initpos/8;
333    
334          return len;          return len;
335  }  }
336    
# Line 349  Line 355 
355          }          }
356  }  }
357    
   
 /* 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);  
         }  
 }  
   
   
358  /* read n bits from bitstream */  /* read n bits from bitstream */
359    
360  static uint32_t __inline  static uint32_t __inline
# Line 425  Line 417 
417          }          }
418  }  }
419    
420    static const int stuffing_codes[8] =
421    {
422                    /* nbits     stuffing code */
423            0,              /* 1          0 */
424            1,              /* 2          01 */
425            3,              /* 3          011 */
426            7,              /* 4          0111 */
427            0xf,    /* 5          01111 */
428            0x1f,   /* 6          011111 */
429            0x3f,   /* 7          0111111 */
430            0x7f,   /* 8          01111111 */
431    };
432    
433    /* pad bitstream to the next byte boundary */
434    
435    static void __inline
436    BitstreamPad(Bitstream * const bs)
437    {
438            int bits = 8 - (bs->pos % 8);
439            if (bits < 8)
440                    BitstreamPutBits(bs, stuffing_codes[bits - 1], bits);
441    }
442    
443    
444    /*
445     * pad bitstream to the next byte boundary
446     * alway pad: even if currently at the byte boundary
447     */
448    
449    static void __inline
450    BitstreamPadAlways(Bitstream * const bs)
451    {
452            int bits = 8 - (bs->pos % 8);
453            BitstreamPutBits(bs, stuffing_codes[bits - 1], bits);
454    }
455    
456  #endif /* _BITSTREAM_H_ */  #endif /* _BITSTREAM_H_ */

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