1/* 2 * Bytestream functions 3 * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr> 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#ifndef AVCODEC_BYTESTREAM_H 23#define AVCODEC_BYTESTREAM_H 24 25#include <string.h> 26#include "libavutil/common.h" 27#include "libavutil/intreadwrite.h" 28 29#define DEF_T(type, name, bytes, read, write) \ 30static av_always_inline type bytestream_get_ ## name(const uint8_t **b){\ 31 (*b) += bytes;\ 32 return read(*b - bytes);\ 33}\ 34static av_always_inline void bytestream_put_ ##name(uint8_t **b, const type value){\ 35 write(*b, value);\ 36 (*b) += bytes;\ 37} 38 39#define DEF(name, bytes, read, write) \ 40 DEF_T(unsigned int, name, bytes, read, write) 41#define DEF64(name, bytes, read, write) \ 42 DEF_T(uint64_t, name, bytes, read, write) 43 44DEF64(le64, 8, AV_RL64, AV_WL64) 45DEF (le32, 4, AV_RL32, AV_WL32) 46DEF (le24, 3, AV_RL24, AV_WL24) 47DEF (le16, 2, AV_RL16, AV_WL16) 48DEF64(be64, 8, AV_RB64, AV_WB64) 49DEF (be32, 4, AV_RB32, AV_WB32) 50DEF (be24, 3, AV_RB24, AV_WB24) 51DEF (be16, 2, AV_RB16, AV_WB16) 52DEF (byte, 1, AV_RB8 , AV_WB8 ) 53 54#undef DEF 55#undef DEF64 56#undef DEF_T 57 58static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size) 59{ 60 memcpy(dst, *b, size); 61 (*b) += size; 62 return size; 63} 64 65static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size) 66{ 67 memcpy(*b, src, size); 68 (*b) += size; 69} 70 71#endif /* AVCODEC_BYTESTREAM_H */ 72