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  1. /*
  2.  * copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #ifndef AVCODEC_UNARY_H
  22. #define AVCODEC_UNARY_H
  23.  
  24. #include "get_bits.h"
  25.  
  26. /**
  27.  * Get unary code of limited length
  28.  * @param gb GetBitContext
  29.  * @param[in] stop The bitstop value (unary code of 1's or 0's)
  30.  * @param[in] len Maximum length
  31.  * @return Unary length/index
  32.  */
  33. static inline int get_unary(GetBitContext *gb, int stop, int len)
  34. {
  35.     int i;
  36.  
  37.     for(i = 0; i < len && get_bits1(gb) != stop; i++);
  38.     return i;
  39. }
  40.  
  41. /**
  42.  * Get unary code terminated by a 0 with a maximum length of 33
  43.  * @param gb GetBitContext
  44.  * @return Unary length/index
  45.  */
  46. static inline int get_unary_0_33(GetBitContext *gb)
  47. {
  48.     return get_unary(gb, 0, 33);
  49. }
  50.  
  51. static inline int get_unary_0_9(GetBitContext *gb)
  52. {
  53.     return get_unary(gb, 0, 9);
  54. }
  55.  
  56. #endif /* AVCODEC_UNARY_H */
  57.