/*
  * Shared functions between AMR codecs
  *
  * Copyright (c) 2010 Marcelo Galvao Povoa
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef AVCODEC_AMR_H
 #define AVCODEC_AMR_H
 

 #include <string.h>
 

 #include "avcodec.h"
 

 #ifdef AMR_USE_16BIT_TABLES
 #define R_TABLE_TYPE uint16_t
 #else
 #define R_TABLE_TYPE uint8_t
 #endif
 
 /**
  * Fill the frame structure variables from bitstream by parsing the
  * given reordering table that uses the following format:
  *
  * Each field (16 bits) in the AMR Frame is stored as:
  * - one byte for the number of bits in the field
  * - one byte for the field index
  * - then, one byte for each bit of the field (from most-significant to least)
  *         of the position of that bit in the AMR frame.
  *
  * @param out pointer to the frame struct
  * @param size the size in bytes of the frame struct
  * @param data input bitstream after the frame header
  * @param ord_table the reordering table as above
  */
 static inline void ff_amr_bit_reorder(uint16_t *out, int size,
                                       const uint8_t *data,
                                       const R_TABLE_TYPE *ord_table)
 {
     int field_size;
 
     memset(out, 0, size);
     while ((field_size = *ord_table++)) {
         int field = 0;
         int field_offset = *ord_table++;
         while (field_size--) {
            int bit = *ord_table++;
            field <<= 1;
            field |= data[bit >> 3] >> (bit & 7) & 1;
         }

         out[field_offset >> 1] = field;

     }
 }
 
 #endif /* AVCODEC_AMR_H */