yading@10: /* yading@10: * Shared functions between AMR codecs yading@10: * yading@10: * Copyright (c) 2010 Marcelo Galvao Povoa yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: #ifndef AVCODEC_AMR_H yading@10: #define AVCODEC_AMR_H yading@10: yading@10: #include yading@10: yading@10: #include "avcodec.h" yading@10: yading@10: #ifdef AMR_USE_16BIT_TABLES yading@10: #define R_TABLE_TYPE uint16_t yading@10: #else yading@10: #define R_TABLE_TYPE uint8_t yading@10: #endif yading@10: yading@10: /** yading@10: * Fill the frame structure variables from bitstream by parsing the yading@10: * given reordering table that uses the following format: yading@10: * yading@10: * Each field (16 bits) in the AMR Frame is stored as: yading@10: * - one byte for the number of bits in the field yading@10: * - one byte for the field index yading@10: * - then, one byte for each bit of the field (from most-significant to least) yading@10: * of the position of that bit in the AMR frame. yading@10: * yading@10: * @param out pointer to the frame struct yading@10: * @param size the size in bytes of the frame struct yading@10: * @param data input bitstream after the frame header yading@10: * @param ord_table the reordering table as above yading@10: */ yading@10: static inline void ff_amr_bit_reorder(uint16_t *out, int size, yading@10: const uint8_t *data, yading@10: const R_TABLE_TYPE *ord_table) yading@10: { yading@10: int field_size; yading@10: yading@10: memset(out, 0, size); yading@10: while ((field_size = *ord_table++)) { yading@10: int field = 0; yading@10: int field_offset = *ord_table++; yading@10: while (field_size--) { yading@10: int bit = *ord_table++; yading@10: field <<= 1; yading@10: field |= data[bit >> 3] >> (bit & 7) & 1; yading@10: } yading@10: out[field_offset >> 1] = field; yading@10: } yading@10: } yading@10: yading@10: #endif /* AVCODEC_AMR_H */