LCOV - code coverage report
Current view: top level - src/libavcodec - amr.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 11 11 100.0 %
Date: 2017-01-24 04:42:20 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Shared functions between AMR codecs
       3             :  *
       4             :  * Copyright (c) 2010 Marcelo Galvao Povoa
       5             :  *
       6             :  * This file is part of FFmpeg.
       7             :  *
       8             :  * FFmpeg is free software; you can redistribute it and/or
       9             :  * modify it under the terms of the GNU Lesser General Public
      10             :  * License as published by the Free Software Foundation; either
      11             :  * version 2.1 of the License, or (at your option) any later version.
      12             :  *
      13             :  * FFmpeg is distributed in the hope that it will be useful,
      14             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      15             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      16             :  * Lesser General Public License for more details.
      17             :  *
      18             :  * You should have received a copy of the GNU Lesser General Public
      19             :  * License along with FFmpeg; if not, write to the Free Software
      20             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      21             :  */
      22             : 
      23             : #ifndef AVCODEC_AMR_H
      24             : #define AVCODEC_AMR_H
      25             : 
      26             : #include <string.h>
      27             : 
      28             : #include "avcodec.h"
      29             : 
      30             : #ifdef AMR_USE_16BIT_TABLES
      31             : typedef uint16_t R_TABLE_TYPE;
      32             : #else
      33             : typedef uint8_t R_TABLE_TYPE;
      34             : #endif
      35             : 
      36             : /**
      37             :  * Fill the frame structure variables from bitstream by parsing the
      38             :  * given reordering table that uses the following format:
      39             :  *
      40             :  * Each field (16 bits) in the AMR Frame is stored as:
      41             :  * - one byte for the number of bits in the field
      42             :  * - one byte for the field index
      43             :  * - then, one byte for each bit of the field (from most-significant to least)
      44             :  *         of the position of that bit in the AMR frame.
      45             :  *
      46             :  * @param out pointer to the frame struct
      47             :  * @param size the size in bytes of the frame struct
      48             :  * @param data input bitstream after the frame header
      49             :  * @param ord_table the reordering table as above
      50             :  */
      51        9040 : static inline void ff_amr_bit_reorder(uint16_t *out, int size,
      52             :                                       const uint8_t *data,
      53             :                                       const R_TABLE_TYPE *ord_table)
      54             : {
      55             :     int field_size;
      56             : 
      57        9040 :     memset(out, 0, size);
      58      380496 :     while ((field_size = *ord_table++)) {
      59      362416 :         int field = 0;
      60      362416 :         int field_offset = *ord_table++;
      61     3449052 :         while (field_size--) {
      62     2724220 :            int bit = *ord_table++;
      63     2724220 :            field <<= 1;
      64     2724220 :            field |= data[bit >> 3] >> (bit & 7) & 1;
      65             :         }
      66      362416 :         out[field_offset >> 1] = field;
      67             :     }
      68        9040 : }
      69             : 
      70             : #endif /* AVCODEC_AMR_H */

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