amr.h
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1 /*
2  * Shared functions between AMR codecs
3  *
4  * Copyright (c) 2010 Marcelo Galvao Povoa
5  *
6  * This file is part of Libav.
7  *
8  * Libav 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  * Libav 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 Libav; 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 "avcodec.h"
27 
28 #ifdef AMR_USE_16BIT_TABLES
29 #define R_TABLE_TYPE uint16_t
30 #else
31 #define R_TABLE_TYPE uint8_t
32 #endif
33 
49 static inline void ff_amr_bit_reorder(uint16_t *out, int size,
50  const uint8_t *data,
51  const R_TABLE_TYPE *ord_table)
52 {
53  int field_size;
54 
55  memset(out, 0, size);
56  while ((field_size = *ord_table++)) {
57  int field = 0;
58  int field_offset = *ord_table++;
59  while (field_size--) {
60  int bit = *ord_table++;
61  field <<= 1;
62  field |= data[bit >> 3] >> (bit & 7) & 1;
63  }
64  out[field_offset] = field;
65  }
66 }
67 
68 #endif /* AVCODEC_AMR_H */