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revision 1.13, Sat Sep 21 03:07:56 2002 UTC revision 1.22, Mon May 23 09:29:43 2005 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>
  *  
  *  This program is an implementation of a part of one or more MPEG-4  
  *  Video tools as specified in ISO/IEC 14496-2 standard.  Those intending  
  *  to use this software module in hardware or software products are  
  *  advised that its use may infringe existing patents or copyrights, and  
  *  any such use would be at such party's own risk.  The original  
  *  developer of this software module and his/her company, and subsequent  
  *  editors and their companies, will have no liability for use of this  
  *  software or modifications or derivatives thereof.  
7   *   *
8   *  This program is free software ; you can redistribute it and/or modify   *  This program is free software ; you can redistribute it and/or modify
9   *  it under the terms of the GNU General Public License as published by   *  it under the terms of the GNU General Public License as published by
# Line 44  Line 35 
35   * Constants   * Constants
36   ****************************************************************************/   ****************************************************************************/
37    
38  // comment any #defs we dont use  /* comment any #defs we dont use */
39    
40  #define VIDOBJ_START_CODE               0x00000100      /* ..0x0000011f  */  #define VIDOBJ_START_CODE               0x00000100      /* ..0x0000011f  */
41  #define VIDOBJLAY_START_CODE    0x00000120      /* ..0x0000012f */  #define VIDOBJLAY_START_CODE    0x00000120      /* ..0x0000012f */
# Line 52  Line 43 
43  #define VISOBJSEQ_STOP_CODE             0x000001b1      /* ??? */  #define VISOBJSEQ_STOP_CODE             0x000001b1      /* ??? */
44  #define USERDATA_START_CODE             0x000001b2  #define USERDATA_START_CODE             0x000001b2
45  #define GRPOFVOP_START_CODE             0x000001b3  #define GRPOFVOP_START_CODE             0x000001b3
46  //#define VIDSESERR_ERROR_CODE  0x000001b4  /*#define VIDSESERR_ERROR_CODE  0x000001b4 */
47  #define VISOBJ_START_CODE               0x000001b5  #define VISOBJ_START_CODE               0x000001b5
48  //#define SLICE_START_CODE      0x000001b7  #define VOP_START_CODE                  0x000001b6
49  //#define EXT_START_CODE        0x000001b8  /*#define STUFFING_START_CODE   0x000001c3 */
50    
51    
52  #define VISOBJ_TYPE_VIDEO                               1  #define VISOBJ_TYPE_VIDEO                               1
53  //#define VISOBJ_TYPE_STILLTEXTURE      2  /*#define VISOBJ_TYPE_STILLTEXTURE      2 */
54  //#define VISOBJ_TYPE_MESH              3  /*#define VISOBJ_TYPE_MESH              3 */
55  //#define VISOBJ_TYPE_FBA               4  /*#define VISOBJ_TYPE_FBA               4 */
56  //#define VISOBJ_TYPE_3DMESH            5  /*#define VISOBJ_TYPE_3DMESH            5 */
57    
58    
59  #define VIDOBJLAY_TYPE_SIMPLE                   1  #define VIDOBJLAY_TYPE_SIMPLE                   1
60  //#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE    2  /*#define VIDOBJLAY_TYPE_SIMPLE_SCALABLE    2 */
61  #define VIDOBJLAY_TYPE_CORE                             3  /*#define VIDOBJLAY_TYPE_CORE                           3 */
62  #define VIDOBJLAY_TYPE_MAIN                             4  /*#define VIDOBJLAY_TYPE_MAIN                           4 */
63    /*#define VIDOBJLAY_TYPE_NBIT                           5 */
64    /*#define VIDOBJLAY_TYPE_ANIM_TEXT                      6 */
65  //#define VIDOBJLAY_AR_SQUARE           1  /*#define VIDOBJLAY_TYPE_ANIM_MESH                      7 */
66  //#define VIDOBJLAY_AR_625TYPE_43       2  /*#define VIDOBJLAY_TYPE_SIMPLE_FACE            8 */
67  //#define VIDOBJLAY_AR_525TYPE_43       3  /*#define VIDOBJLAY_TYPE_STILL_SCALABLE         9 */
68  //#define VIDOBJLAY_AR_625TYPE_169      8  #define VIDOBJLAY_TYPE_ART_SIMPLE               10
69  //#define VIDOBJLAY_AR_525TYPE_169      9  /*#define VIDOBJLAY_TYPE_CORE_SCALABLE          11 */
70    /*#define VIDOBJLAY_TYPE_ACE                            12 */
71    /*#define VIDOBJLAY_TYPE_ADVANCED_SCALABLE_TEXTURE 13 */
72    /*#define VIDOBJLAY_TYPE_SIMPLE_FBA                     14 */
73    /*#define VIDEOJLAY_TYPE_SIMPLE_STUDIO    15*/
74    /*#define VIDEOJLAY_TYPE_CORE_STUDIO      16*/
75    #define VIDOBJLAY_TYPE_ASP              17
76    /*#define VIDOBJLAY_TYPE_FGS              18*/
77    
78    
79    /*#define VIDOBJLAY_AR_SQUARE           1 */
80    /*#define VIDOBJLAY_AR_625TYPE_43       2 */
81    /*#define VIDOBJLAY_AR_525TYPE_43       3 */
82    /*#define VIDOBJLAY_AR_625TYPE_169      8 */
83    /*#define VIDOBJLAY_AR_525TYPE_169      9 */
84  #define VIDOBJLAY_AR_EXTPAR                             15  #define VIDOBJLAY_AR_EXTPAR                             15
85    
86    
# Line 84  Line 89 
89  #define VIDOBJLAY_SHAPE_BINARY_ONLY             2  #define VIDOBJLAY_SHAPE_BINARY_ONLY             2
90  #define VIDOBJLAY_SHAPE_GRAYSCALE               3  #define VIDOBJLAY_SHAPE_GRAYSCALE               3
91    
92  #define VO_START_CODE   0x8  
93  #define VOL_START_CODE  0x12  #define SPRITE_NONE             0
94  #define VOP_START_CODE  0x1b6  #define SPRITE_STATIC   1
95    #define SPRITE_GMC              2
96    
97    
98    
99  #define READ_MARKER()   BitstreamSkip(bs, 1)  #define READ_MARKER()   BitstreamSkip(bs, 1)
100  #define WRITE_MARKER()  BitstreamPutBit(bs, 1)  #define WRITE_MARKER()  BitstreamPutBit(bs, 1)
101    
102  // vop coding types  /* vop coding types  */
103  // intra, prediction, backward, sprite, not_coded  /* intra, prediction, backward, sprite, not_coded */
104  #define I_VOP   0  #define I_VOP   0
105  #define P_VOP   1  #define P_VOP   1
106  #define B_VOP   2  #define B_VOP   2
107  #define S_VOP   3  #define S_VOP   3
108  #define N_VOP   4  #define N_VOP   4
109    
110  // resync-specific  /* resync-specific */
111  #define NUMBITS_VP_RESYNC_MARKER  17  #define NUMBITS_VP_RESYNC_MARKER  17
112  #define RESYNC_MARKER 1  #define RESYNC_MARKER 1
113    
# Line 108  Line 116 
116   * Prototypes   * Prototypes
117   ****************************************************************************/   ****************************************************************************/
118    
119  int  int read_video_packet_header(Bitstream *bs,
120  read_video_packet_header(Bitstream *bs, const int addbits, int * quant);                                                           DECODER * dec,
121                                                             const int addbits,
122                                                             int *quant,
123                                                             int *fcode_forward,
124                                                             int *fcode_backward,
125                                                             int *intra_dc_threshold);
126    
127  // header stuff  /* header stuff */
128  int BitstreamReadHeaders(Bitstream * bs,  int BitstreamReadHeaders(Bitstream * bs,
129                                                   DECODER * dec,                                                   DECODER * dec,
130                                                   uint32_t * rounding,                                                   uint32_t * rounding,
131                                                   uint32_t * quant,                                                   uint32_t * quant,
132                                                   uint32_t * fcode_forward,                                                   uint32_t * fcode_forward,
133                                                   uint32_t * fcode_backward,                                                   uint32_t * fcode_backward,
134                                                   uint32_t * intra_dc_threshold);                                                   uint32_t * intra_dc_threshold,
135                                                     WARPPOINTS * gmc_warp);
136    
137    
138  void BitstreamWriteVolHeader(Bitstream * const bs,  void BitstreamWriteVolHeader(Bitstream * const bs,
139                                                           const MBParam * pParam,                                                           const MBParam * pParam,
140                                                           const FRAMEINFO * frame);                                                           const FRAMEINFO * const frame);
141    
142  void BitstreamWriteVopHeader(Bitstream * const bs,  void BitstreamWriteVopHeader(Bitstream * const bs,
143                                                           const MBParam * pParam,                                                           const MBParam * pParam,
144                                                           const FRAMEINFO * frame,                                                           const FRAMEINFO * const frame,
145                                                           int vop_coded);                                                           int vop_coded,
146                                                             unsigned int quant);
147    
148    void BitstreamWriteUserData(Bitstream * const bs,
149                                                            const char *data,
150                                                            const unsigned int length);
151    
152  /*****************************************************************************  void
153   * Inlined functions  BitstreamWriteEndOfSequence(Bitstream * const bs);
154   ****************************************************************************/  
155    void
156    BitstreamWriteGroupOfVopHeader(Bitstream * const bs,
157                                   const MBParam * pParam,
158                                   uint32_t is_closed_gov);
159    
160    void write_video_packet_header(Bitstream * const bs,
161                                   const MBParam * pParam,
162                                   const FRAMEINFO * const frame,
163                                   int mbnum);
164    
165  /* initialise bitstream structure */  /* initialise bitstream structure */
166    
# Line 143  Line 170 
170                            uint32_t length)                            uint32_t length)
171  {  {
172          uint32_t tmp;          uint32_t tmp;
173            size_t bitpos;
174            ptr_t adjbitstream = (ptr_t)bitstream;
175    
176          bs->start = bs->tail = (uint32_t *) bitstream;          /*
177             * Start the stream on a uint32_t boundary, by rounding down to the
178             * previous uint32_t and skipping the intervening bytes.
179             */
180            bitpos = ((sizeof(uint32_t)-1) & (size_t)bitstream);
181            adjbitstream = adjbitstream - bitpos;
182            bs->start = bs->tail = (uint32_t *) adjbitstream;
183    
184          tmp = *(uint32_t *) bitstream;          tmp = *bs->start;
185  #ifndef ARCH_IS_BIG_ENDIAN  #ifndef ARCH_IS_BIG_ENDIAN
186          BSWAP(tmp);          BSWAP(tmp);
187  #endif  #endif
188          bs->bufa = tmp;          bs->bufa = tmp;
189    
190          tmp = *((uint32_t *) bitstream + 1);          tmp = *(bs->start + 1);
191  #ifndef ARCH_IS_BIG_ENDIAN  #ifndef ARCH_IS_BIG_ENDIAN
192          BSWAP(tmp);          BSWAP(tmp);
193  #endif  #endif
194          bs->bufb = tmp;          bs->bufb = tmp;
195    
196          bs->buf = 0;          bs->buf = 0;
197          bs->pos = 0;          bs->pos = bs->initpos = bitpos*8;
198          bs->length = length;          bs->length = length;
199  }  }
200    
# Line 186  Line 221 
221          bs->bufb = tmp;          bs->bufb = tmp;
222    
223          bs->buf = 0;          bs->buf = 0;
224          bs->pos = 0;          bs->pos = bs->initpos;
225  }  }
226    
227    
# Line 210  Line 245 
245    
246  /* skip n bits forward in bitstream */  /* skip n bits forward in bitstream */
247    
248  static void __inline  static __inline void
249  BitstreamSkip(Bitstream * const bs,  BitstreamSkip(Bitstream * const bs,
250                            const uint32_t bits)                            const uint32_t bits)
251  {  {
# Line 231  Line 266 
266  }  }
267    
268    
269  // number of bits to next byte alignment  /* number of bits to next byte alignment */
270  static uint32_t __inline  static __inline uint32_t
271  BitstreamNumBitsToByteAlign(Bitstream *bs)  BitstreamNumBitsToByteAlign(Bitstream *bs)
272  {  {
273          uint32_t n = (32 - bs->pos) % 8;          uint32_t n = (32 - bs->pos) % 8;
# Line 240  Line 275 
275  }  }
276    
277    
278  // show nbits from next byte alignment  /* show nbits from next byte alignment */
279  static uint32_t __inline  static __inline uint32_t
280  BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)  BitstreamShowBitsFromByteAlign(Bitstream *bs, int bits)
281  {  {
282          int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs);          int bspos = bs->pos + BitstreamNumBitsToByteAlign(bs);
# Line 263  Line 298 
298    
299  /* move forward to the next byte boundary */  /* move forward to the next byte boundary */
300    
301  static void __inline  static __inline void
302  BitstreamByteAlign(Bitstream * const bs)  BitstreamByteAlign(Bitstream * const bs)
303  {  {
304          uint32_t remainder = bs->pos % 8;          uint32_t remainder = bs->pos % 8;
# Line 279  Line 314 
314  static uint32_t __inline  static uint32_t __inline
315  BitstreamPos(const Bitstream * const bs)  BitstreamPos(const Bitstream * const bs)
316  {  {
317          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));
318  }  }
319    
320    
321  /*      flush the bitstream & return length (unit bytes)  /*
322          NOTE: assumes no futher bitstream functions will be called.   * flush the bitstream & return length (unit bytes)
323     * NOTE: assumes no futher bitstream functions will be called.
324   */   */
325    
326  static uint32_t __inline  static uint32_t __inline
327  BitstreamLength(Bitstream * const bs)  BitstreamLength(Bitstream * const bs)
328  {  {
329          uint32_t len = (ptr_t) bs->tail - (ptr_t) bs->start;          uint32_t len = (uint32_t)((ptr_t)bs->tail - (ptr_t)bs->start);
330    
331          if (bs->pos) {          if (bs->pos) {
332                  uint32_t b = bs->buf;                  uint32_t b = bs->buf;
# Line 303  Line 339 
339                  len += (bs->pos + 7) / 8;                  len += (bs->pos + 7) / 8;
340          }          }
341    
342            /* initpos is always on a byte boundary */
343            if (bs->initpos)
344                    len -= bs->initpos/8;
345    
346          return len;          return len;
347  }  }
348    
# Line 327  Line 367 
367          }          }
368  }  }
369    
   
 /* 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);  
         }  
 }  
   
   
370  /* read n bits from bitstream */  /* read n bits from bitstream */
371    
372  static uint32_t __inline  static uint32_t __inline
# Line 403  Line 429 
429          }          }
430  }  }
431    
432    static const int stuffing_codes[8] =
433    {
434                    /* nbits     stuffing code */
435            0,              /* 1          0 */
436            1,              /* 2          01 */
437            3,              /* 3          011 */
438            7,              /* 4          0111 */
439            0xf,    /* 5          01111 */
440            0x1f,   /* 6          011111 */
441            0x3f,   /* 7          0111111 */
442            0x7f,   /* 8          01111111 */
443    };
444    
445    /* pad bitstream to the next byte boundary */
446    
447    static void __inline
448    BitstreamPad(Bitstream * const bs)
449    {
450            int bits = 8 - (bs->pos % 8);
451            if (bits < 8)
452                    BitstreamPutBits(bs, stuffing_codes[bits - 1], bits);
453    }
454    
455    
456    /*
457     * pad bitstream to the next byte boundary
458     * alway pad: even if currently at the byte boundary
459     */
460    
461    static void __inline
462    BitstreamPadAlways(Bitstream * const bs)
463    {
464            int bits = 8 - (bs->pos % 8);
465            BitstreamPutBits(bs, stuffing_codes[bits - 1], bits);
466    }
467    
468  #endif /* _BITSTREAM_H_ */  #endif /* _BITSTREAM_H_ */

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