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 FFMPEG_BYTESTREAM_H
  23 #define FFMPEG_BYTESTREAM_H
  24
  25 #define DEF(name, bytes, read, write)\
  26 static av_always_inline unsigned int bytestream_get_ ## name(uint8_t **b){\
  27     (*b) += bytes;\
  28     return read(*b - bytes);\
  29 }\
  30 static av_always_inline void bytestream_put_ ##name(uint8_t **b, const unsigned int value){\
  31     write(*b, value);\
  32     (*b) += bytes;\
  33 };
  34
  35 DEF(le32, 4, AV_RL32, AV_WL32)
  36 DEF(le24, 3, AV_RL24, AV_WL24)
  37 DEF(le16, 2, AV_RL16, AV_WL16)
  38 DEF(be32, 4, AV_RB32, AV_WB32)
  39 DEF(be24, 3, AV_RB24, AV_WB24)
  40 DEF(be16, 2, AV_RB16, AV_WB16)
  41 DEF(byte, 1, AV_RB8 , AV_WB8 )
  42
  43 #undef DEF
  44
  45 static av_always_inline unsigned int bytestream_get_buffer(uint8_t **b, uint8_t *dst, unsigned int size)
  46 {
  47     memcpy(dst, *b, size);
  48     (*b) += size;
  49     return size;
  50 }
  51
  52 static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
  53 {
  54     memcpy(*b, src, size);
  55     (*b) += size;
  56 }
  57
  58 #endif /* FFMPEG_BYTESTREAM_H */