| /* | |
| * 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 | |
| */ | |
| typedef uint16_t R_TABLE_TYPE; | |
| typedef uint8_t R_TABLE_TYPE; | |
| /** | |
| * 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; | |
| } | |
| } | |