0f2178a86e48355bcc86bc9f4039fe4e91f37e44
[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 AVCODEC_BYTESTREAM_H
23 #define AVCODEC_BYTESTREAM_H
24
25 #include "libavutil/common.h"
26 #include "libavutil/intreadwrite.h"
27
28 #define DEF_T(type, name, bytes, read, write) \
29 static av_always_inline type bytestream_get_ ## name(const uint8_t **b){\
30 (*b) += bytes;\
31 return read(*b - bytes);\
32 }\
33 static av_always_inline void bytestream_put_ ##name(uint8_t **b, const type value){\
34 write(*b, value);\
35 (*b) += bytes;\
36 }
37
38 #define DEF(name, bytes, read, write) \
39 DEF_T(unsigned int, name, bytes, read, write)
40 #define DEF64(name, bytes, read, write) \
41 DEF_T(uint64_t, name, bytes, read, write)
42
43 DEF64(le64, 8, AV_RL64, AV_WL64)
44 DEF (le32, 4, AV_RL32, AV_WL32)
45 DEF (le24, 3, AV_RL24, AV_WL24)
46 DEF (le16, 2, AV_RL16, AV_WL16)
47 DEF64(be64, 8, AV_RB64, AV_WB64)
48 DEF (be32, 4, AV_RB32, AV_WB32)
49 DEF (be24, 3, AV_RB24, AV_WB24)
50 DEF (be16, 2, AV_RB16, AV_WB16)
51 DEF (byte, 1, AV_RB8 , AV_WB8 )
52
53 #undef DEF
54 #undef DEF64
55 #undef DEF_T
56
57 static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size)
58 {
59 memcpy(dst, *b, size);
60 (*b) += size;
61 return size;
62 }
63
64 static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
65 {
66 memcpy(*b, src, size);
67 (*b) += size;
68 }
69
70 #endif /* AVCODEC_BYTESTREAM_H */