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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Shared functions between AMR codecs |
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| 3 | * |
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| 4 | * Copyright (c) 2010 Marcelo Galvao Povoa |
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| 5 | * |
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| 6 | * This file is part of FFmpeg. |
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| 7 | * |
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| 8 | * FFmpeg is free software; you can redistribute it and/or |
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| 9 | * modify it under the terms of the GNU Lesser General Public |
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| 10 | * License as published by the Free Software Foundation; either |
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| 11 | * version 2.1 of the License, or (at your option) any later version. |
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| 12 | * |
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| 13 | * FFmpeg is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * Lesser General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU Lesser General Public |
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| 19 | * License along with FFmpeg; if not, write to the Free Software |
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| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |||
| 23 | #ifndef AVCODEC_AMR_H |
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| 24 | #define AVCODEC_AMR_H |
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| 25 | |||
| 26 | #include |
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| 27 | |||
| 28 | #include "avcodec.h" |
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| 29 | |||
| 30 | #ifdef AMR_USE_16BIT_TABLES |
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| 31 | #define R_TABLE_TYPE uint16_t |
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| 32 | #else |
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| 33 | #define R_TABLE_TYPE uint8_t |
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| 34 | #endif |
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| 35 | |||
| 36 | /** |
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| 37 | * Fill the frame structure variables from bitstream by parsing the |
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| 38 | * given reordering table that uses the following format: |
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| 39 | * |
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| 40 | * Each field (16 bits) in the AMR Frame is stored as: |
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| 41 | * - one byte for the number of bits in the field |
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| 42 | * - one byte for the field index |
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| 43 | * - then, one byte for each bit of the field (from most-significant to least) |
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| 44 | * of the position of that bit in the AMR frame. |
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| 45 | * |
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| 46 | * @param out pointer to the frame struct |
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| 47 | * @param size the size in bytes of the frame struct |
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| 48 | * @param data input bitstream after the frame header |
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| 49 | * @param ord_table the reordering table as above |
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| 50 | */ |
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| 51 | static inline void ff_amr_bit_reorder(uint16_t *out, int size, |
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| 52 | const uint8_t *data, |
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| 53 | const R_TABLE_TYPE *ord_table) |
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| 54 | { |
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| 55 | int field_size; |
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| 56 | |||
| 57 | memset(out, 0, size); |
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| 58 | while ((field_size = *ord_table++)) { |
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| 59 | int field = 0; |
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| 60 | int field_offset = *ord_table++; |
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| 61 | while (field_size--) { |
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| 62 | int bit = *ord_table++; |
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| 63 | field <<= 1; |
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| 64 | field |= data[bit >> 3] >> (bit & 7) & 1; |
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| 65 | } |
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| 66 | out[field_offset >> 1] = field; |
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| 67 | } |
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| 68 | } |
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| 69 | |||
| 70 | #endif /* AVCODEC_AMR_H */ |