| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | 8552 | 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 | 8552 | memset(out, 0, size); | |
| 58 |
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353402 | while ((field_size = *ord_table++)) { |
| 59 | 344850 | int field = 0; | |
| 60 | 344850 | int field_offset = *ord_table++; | |
| 61 |
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2945632 | while (field_size--) { |
| 62 | 2600782 | int bit = *ord_table++; | |
| 63 | 2600782 | field <<= 1; | |
| 64 | 2600782 | field |= data[bit >> 3] >> (bit & 7) & 1; | |
| 65 | } | ||
| 66 | 344850 | out[field_offset >> 1] = field; | |
| 67 | } | ||
| 68 | 8552 | } | |
| 69 | |||
| 70 | #endif /* AVCODEC_AMR_H */ | ||
| 71 |