[cvs] / xvidcore / src / bitstream / bitstream.h Repository:
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Diff of /xvidcore/src/bitstream/bitstream.h

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revision 1.22, Mon May 23 09:29:43 2005 UTC revision 1.22.2.2, Wed Nov 1 09:26:52 2006 UTC
# Line 162  Line 162 
162                                 const FRAMEINFO * const frame,                                 const FRAMEINFO * const frame,
163                                 int mbnum);                                 int mbnum);
164    
165    /*****************************************************************************
166     * Bitstream
167     ****************************************************************************/
168    
169    /* Input buffer should be readable as full chunks of 8bytes, including
170    the end of the buffer. Padding might be appropriate. If only chunks
171    of 4bytes are applicable, define XVID_SAFE_BS_TAIL. Note that this will
172    slow decoding, so consider this as a last-resort solution */
173    /* #define XVID_SAFE_BS_TAIL */
174    
175  /* initialise bitstream structure */  /* initialise bitstream structure */
176    
177  static void __inline  static void __inline
# Line 193  Line 203 
203  #endif  #endif
204          bs->bufb = tmp;          bs->bufb = tmp;
205    
         bs->buf = 0;  
206          bs->pos = bs->initpos = bitpos*8;          bs->pos = bs->initpos = bitpos*8;
207            /* preserve the intervening bytes */
208            if (bs->initpos > 0)
209                    bs->buf = bs->bufa & (0xffffffff << (32 - bs->initpos));
210            else
211                    bs->buf = 0;
212          bs->length = length;          bs->length = length;
213  }  }
214    
# Line 220  Line 234 
234  #endif  #endif
235          bs->bufb = tmp;          bs->bufb = tmp;
236    
237            /* preserve the intervening bytes */
238            if (bs->initpos > 0)
239                    bs->buf = bs->bufa & (0xffffffff << (32 - bs->initpos));
240            else
241          bs->buf = 0;          bs->buf = 0;
242          bs->pos = bs->initpos;          bs->pos = bs->initpos;
243  }  }
# Line 255  Line 273 
273                  uint32_t tmp;                  uint32_t tmp;
274    
275                  bs->bufa = bs->bufb;                  bs->bufa = bs->bufb;
276    #if defined(XVID_SAFE_BS_TAIL)
277                    if (bs->tail<(bs->start+((bs->length+3)>>2)))
278    #endif
279                    {
280                  tmp = *((uint32_t *) bs->tail + 2);                  tmp = *((uint32_t *) bs->tail + 2);
281  #ifndef ARCH_IS_BIG_ENDIAN  #ifndef ARCH_IS_BIG_ENDIAN
282                  BSWAP(tmp);                  BSWAP(tmp);
283  #endif  #endif
284                  bs->bufb = tmp;                  bs->bufb = tmp;
285                  bs->tail++;                  bs->tail++;
286                    }
287    #if defined(XVID_SAFE_BS_TAIL)
288                    else {
289                            bs->bufb = 0;
290                    }
291    #endif
292                  bs->pos -= 32;                  bs->pos -= 32;
293          }          }
294  }  }

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