libavcodec/bytestream.h

   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 "libavutil/common.h"
  26
  27 #define DEF_T(type, name, bytes, read, write)                             \
  28 static av_always_inline type bytestream_get_ ## name(const uint8_t **b){\
  29     (*b) += bytes;\
  30     return read(*b - bytes);\
  31 }\
  32 static av_always_inline void bytestream_put_ ##name(uint8_t **b, const type value){\
  33     write(*b, value);\
  34     (*b) += bytes;\
  35 }
  36
  37 #define DEF(name, bytes, read, write) \
  38     DEF_T(unsigned int, name, bytes, read, write)
  39 #define DEF64(name, bytes, read, write) \
  40     DEF_T(uint64_t, name, bytes, read, write)
  41
  42 DEF64(le64, 8, AV_RL64, AV_WL64)
  43 DEF  (le32, 4, AV_RL32, AV_WL32)
  44 DEF  (le24, 3, AV_RL24, AV_WL24)
  45 DEF  (le16, 2, AV_RL16, AV_WL16)
  46 DEF64(be64, 8, AV_RB64, AV_WB64)
  47 DEF  (be32, 4, AV_RB32, AV_WB32)
  48 DEF  (be24, 3, AV_RB24, AV_WB24)
  49 DEF  (be16, 2, AV_RB16, AV_WB16)
  50 DEF  (byte, 1, AV_RB8 , AV_WB8 )
  51
  52 #undef DEF
  53 #undef DEF64
  54 #undef DEF_T
  55
  56 static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size)
  57 {
  58     memcpy(dst, *b, size);
  59     (*b) += size;
  60     return size;
  61 }
  62
  63 static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
  64 {
  65     memcpy(*b, src, size);
  66     (*b) += size;
  67 }
  68
  69 #endif /* AVCODEC_BYTESTREAM_H */