add little endian 24bit read/write
[libav.git] / 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 */