Libav
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00001 /* 00002 * Bytestream functions 00003 * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr> 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #ifndef AVCODEC_BYTESTREAM_H 00023 #define AVCODEC_BYTESTREAM_H 00024 00025 #include <string.h> 00026 #include "libavutil/common.h" 00027 #include "libavutil/intreadwrite.h" 00028 00029 #define DEF_T(type, name, bytes, read, write) \ 00030 static av_always_inline type bytestream_get_ ## name(const uint8_t **b){\ 00031 (*b) += bytes;\ 00032 return read(*b - bytes);\ 00033 }\ 00034 static av_always_inline void bytestream_put_ ##name(uint8_t **b, const type value){\ 00035 write(*b, value);\ 00036 (*b) += bytes;\ 00037 } 00038 00039 #define DEF(name, bytes, read, write) \ 00040 DEF_T(unsigned int, name, bytes, read, write) 00041 #define DEF64(name, bytes, read, write) \ 00042 DEF_T(uint64_t, name, bytes, read, write) 00043 00044 DEF64(le64, 8, AV_RL64, AV_WL64) 00045 DEF (le32, 4, AV_RL32, AV_WL32) 00046 DEF (le24, 3, AV_RL24, AV_WL24) 00047 DEF (le16, 2, AV_RL16, AV_WL16) 00048 DEF64(be64, 8, AV_RB64, AV_WB64) 00049 DEF (be32, 4, AV_RB32, AV_WB32) 00050 DEF (be24, 3, AV_RB24, AV_WB24) 00051 DEF (be16, 2, AV_RB16, AV_WB16) 00052 DEF (byte, 1, AV_RB8 , AV_WB8 ) 00053 00054 #undef DEF 00055 #undef DEF64 00056 #undef DEF_T 00057 00058 static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size) 00059 { 00060 memcpy(dst, *b, size); 00061 (*b) += size; 00062 return size; 00063 } 00064 00065 static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size) 00066 { 00067 memcpy(*b, src, size); 00068 (*b) += size; 00069 } 00070 00071 #endif /* AVCODEC_BYTESTREAM_H */