3 * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
5 * This file is part of FFmpeg.
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.
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.
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
22 #ifndef AVCODEC_BYTESTREAM_H
23 #define AVCODEC_BYTESTREAM_H
26 #include "libavutil/common.h"
27 #include "libavutil/intreadwrite.h"
30 const uint8_t *buffer, *buffer_end;
33 #define DEF_T(type, name, bytes, read, write) \
34 static av_always_inline type bytestream_get_ ## name(const uint8_t **b){\
36 return read(*b - bytes);\
38 static av_always_inline void bytestream_put_ ##name(uint8_t **b, const type value){\
42 static av_always_inline type bytestream2_get_ ## name(GetByteContext *g)\
44 if (g->buffer_end - g->buffer < bytes)\
46 return bytestream_get_ ## name(&g->buffer);\
48 static av_always_inline type bytestream2_peek_ ## name(GetByteContext *g)\
50 if (g->buffer_end - g->buffer < bytes)\
52 return read(g->buffer);\
55 #define DEF(name, bytes, read, write) \
56 DEF_T(unsigned int, name, bytes, read, write)
57 #define DEF64(name, bytes, read, write) \
58 DEF_T(uint64_t, name, bytes, read, write)
60 DEF64(le64, 8, AV_RL64, AV_WL64)
61 DEF (le32, 4, AV_RL32, AV_WL32)
62 DEF (le24, 3, AV_RL24, AV_WL24)
63 DEF (le16, 2, AV_RL16, AV_WL16)
64 DEF64(be64, 8, AV_RB64, AV_WB64)
65 DEF (be32, 4, AV_RB32, AV_WB32)
66 DEF (be24, 3, AV_RB24, AV_WB24)
67 DEF (be16, 2, AV_RB16, AV_WB16)
68 DEF (byte, 1, AV_RB8 , AV_WB8 )
74 static av_always_inline void bytestream2_init(GetByteContext *g,
75 const uint8_t *buf, int buf_size)
78 g->buffer_end = buf + buf_size;
81 static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
83 return g->buffer_end - g->buffer;
86 static av_always_inline void bytestream2_skip(GetByteContext *g,
89 g->buffer += FFMIN(g->buffer_end - g->buffer, size);
92 static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g,
96 int size2 = FFMIN(g->buffer_end - g->buffer, size);
97 memcpy(dst, g->buffer, size2);
102 static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b, uint8_t *dst, unsigned int size)
104 memcpy(dst, *b, size);
109 static av_always_inline void bytestream_put_buffer(uint8_t **b, const uint8_t *src, unsigned int size)
111 memcpy(*b, src, size);
115 #endif /* AVCODEC_BYTESTREAM_H */