3 * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
4 * Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
6 * This file is part of FFmpeg.
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #ifndef AVCODEC_BYTESTREAM_H
24 #define AVCODEC_BYTESTREAM_H
29 #include "libavutil/avassert.h"
30 #include "libavutil/common.h"
31 #include "libavutil/intreadwrite.h"
33 typedef struct GetByteContext
{
34 const uint8_t *buffer
, *buffer_end
, *buffer_start
;
37 typedef struct PutByteContext
{
38 uint8_t *buffer
, *buffer_end
, *buffer_start
;
42 #define DEF(type, name, bytes, read, write) \
43 static av_always_inline type bytestream_get_ ## name(const uint8_t **b) \
46 return read(*b - bytes); \
48 static av_always_inline void bytestream_put_ ## name(uint8_t **b, \
54 static av_always_inline void bytestream2_put_ ## name ## u(PutByteContext *p, \
57 bytestream_put_ ## name(&p->buffer, value); \
59 static av_always_inline void bytestream2_put_ ## name(PutByteContext *p, \
62 if (!p->eof && (p->buffer_end - p->buffer >= bytes)) { \
63 write(p->buffer, value); \
68 static av_always_inline type bytestream2_get_ ## name ## u(GetByteContext *g) \
70 return bytestream_get_ ## name(&g->buffer); \
72 static av_always_inline type bytestream2_get_ ## name(GetByteContext *g) \
74 if (g->buffer_end - g->buffer < bytes) \
76 return bytestream2_get_ ## name ## u(g); \
78 static av_always_inline type bytestream2_peek_ ## name(GetByteContext *g) \
80 if (g->buffer_end - g->buffer < bytes) \
82 return read(g->buffer); \
85 DEF(uint64_t, le64
, 8, AV_RL64
, AV_WL64
)
86 DEF(unsigned int, le32
, 4, AV_RL32
, AV_WL32
)
87 DEF(unsigned int, le24
, 3, AV_RL24
, AV_WL24
)
88 DEF(unsigned int, le16
, 2, AV_RL16
, AV_WL16
)
89 DEF(uint64_t, be64
, 8, AV_RB64
, AV_WB64
)
90 DEF(unsigned int, be32
, 4, AV_RB32
, AV_WB32
)
91 DEF(unsigned int, be24
, 3, AV_RB24
, AV_WB24
)
92 DEF(unsigned int, be16
, 2, AV_RB16
, AV_WB16
)
93 DEF(unsigned int, byte
, 1, AV_RB8
, AV_WB8
)
96 # define bytestream2_get_ne16 bytestream2_get_be16
97 # define bytestream2_get_ne24 bytestream2_get_be24
98 # define bytestream2_get_ne32 bytestream2_get_be32
99 # define bytestream2_get_ne64 bytestream2_get_be64
100 # define bytestream2_get_ne16u bytestream2_get_be16u
101 # define bytestream2_get_ne24u bytestream2_get_be24u
102 # define bytestream2_get_ne32u bytestream2_get_be32u
103 # define bytestream2_get_ne64u bytestream2_get_be64u
104 # define bytestream2_put_ne16 bytestream2_put_be16
105 # define bytestream2_put_ne24 bytestream2_put_be24
106 # define bytestream2_put_ne32 bytestream2_put_be32
107 # define bytestream2_put_ne64 bytestream2_put_be64
108 # define bytestream2_peek_ne16 bytestream2_peek_be16
109 # define bytestream2_peek_ne24 bytestream2_peek_be24
110 # define bytestream2_peek_ne32 bytestream2_peek_be32
111 # define bytestream2_peek_ne64 bytestream2_peek_be64
113 # define bytestream2_get_ne16 bytestream2_get_le16
114 # define bytestream2_get_ne24 bytestream2_get_le24
115 # define bytestream2_get_ne32 bytestream2_get_le32
116 # define bytestream2_get_ne64 bytestream2_get_le64
117 # define bytestream2_get_ne16u bytestream2_get_le16u
118 # define bytestream2_get_ne24u bytestream2_get_le24u
119 # define bytestream2_get_ne32u bytestream2_get_le32u
120 # define bytestream2_get_ne64u bytestream2_get_le64u
121 # define bytestream2_put_ne16 bytestream2_put_le16
122 # define bytestream2_put_ne24 bytestream2_put_le24
123 # define bytestream2_put_ne32 bytestream2_put_le32
124 # define bytestream2_put_ne64 bytestream2_put_le64
125 # define bytestream2_peek_ne16 bytestream2_peek_le16
126 # define bytestream2_peek_ne24 bytestream2_peek_le24
127 # define bytestream2_peek_ne32 bytestream2_peek_le32
128 # define bytestream2_peek_ne64 bytestream2_peek_le64
131 static av_always_inline
void bytestream2_init(GetByteContext
*g
,
135 av_assert0(buf_size
>= 0);
137 g
->buffer_start
= buf
;
138 g
->buffer_end
= buf
+ buf_size
;
141 static av_always_inline
void bytestream2_init_writer(PutByteContext
*p
,
145 av_assert0(buf_size
>= 0);
147 p
->buffer_start
= buf
;
148 p
->buffer_end
= buf
+ buf_size
;
152 static av_always_inline
unsigned int bytestream2_get_bytes_left(GetByteContext
*g
)
154 return g
->buffer_end
- g
->buffer
;
157 static av_always_inline
unsigned int bytestream2_get_bytes_left_p(PutByteContext
*p
)
159 return p
->buffer_end
- p
->buffer
;
162 static av_always_inline
void bytestream2_skip(GetByteContext
*g
,
165 g
->buffer
+= FFMIN(g
->buffer_end
- g
->buffer
, size
);
168 static av_always_inline
void bytestream2_skipu(GetByteContext
*g
,
174 static av_always_inline
void bytestream2_skip_p(PutByteContext
*p
,
180 size2
= FFMIN(p
->buffer_end
- p
->buffer
, size
);
186 static av_always_inline
int bytestream2_tell(GetByteContext
*g
)
188 return (int)(g
->buffer
- g
->buffer_start
);
191 static av_always_inline
int bytestream2_tell_p(PutByteContext
*p
)
193 return (int)(p
->buffer
- p
->buffer_start
);
196 static av_always_inline
int bytestream2_size(GetByteContext
*g
)
198 return (int)(g
->buffer_end
- g
->buffer_start
);
201 static av_always_inline
int bytestream2_size_p(PutByteContext
*p
)
203 return (int)(p
->buffer_end
- p
->buffer_start
);
206 static av_always_inline
int bytestream2_seek(GetByteContext
*g
,
212 offset
= av_clip(offset
, -(g
->buffer
- g
->buffer_start
),
213 g
->buffer_end
- g
->buffer
);
217 offset
= av_clip(offset
, -(g
->buffer_end
- g
->buffer_start
), 0);
218 g
->buffer
= g
->buffer_end
+ offset
;
221 offset
= av_clip(offset
, 0, g
->buffer_end
- g
->buffer_start
);
222 g
->buffer
= g
->buffer_start
+ offset
;
225 return AVERROR(EINVAL
);
227 return bytestream2_tell(g
);
230 static av_always_inline
int bytestream2_seek_p(PutByteContext
*p
,
237 if (p
->buffer_end
- p
->buffer
< offset
)
239 offset
= av_clip(offset
, -(p
->buffer
- p
->buffer_start
),
240 p
->buffer_end
- p
->buffer
);
246 offset
= av_clip(offset
, -(p
->buffer_end
- p
->buffer_start
), 0);
247 p
->buffer
= p
->buffer_end
+ offset
;
250 if (p
->buffer_end
- p
->buffer_start
< offset
)
252 offset
= av_clip(offset
, 0, p
->buffer_end
- p
->buffer_start
);
253 p
->buffer
= p
->buffer_start
+ offset
;
256 return AVERROR(EINVAL
);
258 return bytestream2_tell_p(p
);
261 static av_always_inline
unsigned int bytestream2_get_buffer(GetByteContext
*g
,
265 int size2
= FFMIN(g
->buffer_end
- g
->buffer
, size
);
266 memcpy(dst
, g
->buffer
, size2
);
271 static av_always_inline
unsigned int bytestream2_get_bufferu(GetByteContext
*g
,
275 memcpy(dst
, g
->buffer
, size
);
280 static av_always_inline
unsigned int bytestream2_put_buffer(PutByteContext
*p
,
287 size2
= FFMIN(p
->buffer_end
- p
->buffer
, size
);
290 memcpy(p
->buffer
, src
, size2
);
295 static av_always_inline
unsigned int bytestream2_put_bufferu(PutByteContext
*p
,
299 memcpy(p
->buffer
, src
, size
);
304 static av_always_inline
void bytestream2_set_buffer(PutByteContext
*p
,
311 size2
= FFMIN(p
->buffer_end
- p
->buffer
, size
);
314 memset(p
->buffer
, c
, size2
);
318 static av_always_inline
void bytestream2_set_bufferu(PutByteContext
*p
,
322 memset(p
->buffer
, c
, size
);
326 static av_always_inline
unsigned int bytestream2_get_eof(PutByteContext
*p
)
331 static av_always_inline
unsigned int bytestream2_copy_bufferu(PutByteContext
*p
,
335 memcpy(p
->buffer
, g
->buffer
, size
);
341 static av_always_inline
unsigned int bytestream2_copy_buffer(PutByteContext
*p
,
349 size
= FFMIN(g
->buffer_end
- g
->buffer
, size
);
350 size2
= FFMIN(p
->buffer_end
- p
->buffer
, size
);
354 return bytestream2_copy_bufferu(p
, g
, size2
);
357 static av_always_inline
unsigned int bytestream_get_buffer(const uint8_t **b
,
361 memcpy(dst
, *b
, size
);
366 static av_always_inline
void bytestream_put_buffer(uint8_t **b
,
370 memcpy(*b
, src
, size
);
374 #endif /* AVCODEC_BYTESTREAM_H */