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
28 #include "libavutil/common.h"
29 #include "libavutil/intreadwrite.h"
32 const uint8_t *buffer, *buffer_end, *buffer_start;
36 uint8_t *buffer, *buffer_end, *buffer_start;
40 #define DEF_T(type, name, bytes, read, write) \
41 static av_always_inline type bytestream_get_ ## name(const uint8_t **b) \
44 return read(*b - bytes); \
46 static av_always_inline void bytestream_put_ ## name(uint8_t **b, \
52 static av_always_inline void bytestream2_put_ ## name ## u(PutByteContext *p, \
55 bytestream_put_ ## name(&p->buffer, value); \
57 static av_always_inline void bytestream2_put_ ## name(PutByteContext *p, \
60 if (!p->eof && (p->buffer_end - p->buffer >= bytes)) { \
61 write(p->buffer, value); \
66 static av_always_inline type bytestream2_get_ ## name ## u(GetByteContext *g) \
68 return bytestream_get_ ## name(&g->buffer); \
70 static av_always_inline type bytestream2_get_ ## name(GetByteContext *g) \
72 if (g->buffer_end - g->buffer < bytes) \
74 return bytestream2_get_ ## name ## u(g); \
76 static av_always_inline type bytestream2_peek_ ## name(GetByteContext *g) \
78 if (g->buffer_end - g->buffer < bytes) \
80 return read(g->buffer); \
83 #define DEF(name, bytes, read, write) \
84 DEF_T(unsigned int, name, bytes, read, write)
85 #define DEF64(name, bytes, read, write) \
86 DEF_T(uint64_t, name, bytes, read, write)
88 DEF64(le64, 8, AV_RL64, AV_WL64)
89 DEF (le32, 4, AV_RL32, AV_WL32)
90 DEF (le24, 3, AV_RL24, AV_WL24)
91 DEF (le16, 2, AV_RL16, AV_WL16)
92 DEF64(be64, 8, AV_RB64, AV_WB64)
93 DEF (be32, 4, AV_RB32, AV_WB32)
94 DEF (be24, 3, AV_RB24, AV_WB24)
95 DEF (be16, 2, AV_RB16, AV_WB16)
96 DEF (byte, 1, AV_RB8 , AV_WB8 )
103 # define bytestream2_get_ne16 bytestream2_get_be16
104 # define bytestream2_get_ne24 bytestream2_get_be24
105 # define bytestream2_get_ne32 bytestream2_get_be32
106 # define bytestream2_get_ne64 bytestream2_get_be64
107 # define bytestream2_get_ne16u bytestream2_get_be16u
108 # define bytestream2_get_ne24u bytestream2_get_be24u
109 # define bytestream2_get_ne32u bytestream2_get_be32u
110 # define bytestream2_get_ne64u bytestream2_get_be64u
111 # define bytestream2_put_ne16 bytestream2_put_be16
112 # define bytestream2_put_ne24 bytestream2_put_be24
113 # define bytestream2_put_ne32 bytestream2_put_be32
114 # define bytestream2_put_ne64 bytestream2_put_be64
115 # define bytestream2_peek_ne16 bytestream2_peek_be16
116 # define bytestream2_peek_ne24 bytestream2_peek_be24
117 # define bytestream2_peek_ne32 bytestream2_peek_be32
118 # define bytestream2_peek_ne64 bytestream2_peek_be64
120 # define bytestream2_get_ne16 bytestream2_get_le16
121 # define bytestream2_get_ne24 bytestream2_get_le24
122 # define bytestream2_get_ne32 bytestream2_get_le32
123 # define bytestream2_get_ne64 bytestream2_get_le64
124 # define bytestream2_get_ne16u bytestream2_get_le16u
125 # define bytestream2_get_ne24u bytestream2_get_le24u
126 # define bytestream2_get_ne32u bytestream2_get_le32u
127 # define bytestream2_get_ne64u bytestream2_get_le64u
128 # define bytestream2_put_ne16 bytestream2_put_le16
129 # define bytestream2_put_ne24 bytestream2_put_le24
130 # define bytestream2_put_ne32 bytestream2_put_le32
131 # define bytestream2_put_ne64 bytestream2_put_le64
132 # define bytestream2_peek_ne16 bytestream2_peek_le16
133 # define bytestream2_peek_ne24 bytestream2_peek_le24
134 # define bytestream2_peek_ne32 bytestream2_peek_le32
135 # define bytestream2_peek_ne64 bytestream2_peek_le64
138 static av_always_inline void bytestream2_init(GetByteContext *g,
143 g->buffer_start = buf;
144 g->buffer_end = buf + buf_size;
147 static av_always_inline void bytestream2_init_writer(PutByteContext *p,
152 p->buffer_start = buf;
153 p->buffer_end = buf + buf_size;
157 static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
159 return g->buffer_end - g->buffer;
162 static av_always_inline unsigned int bytestream2_get_bytes_left_p(PutByteContext *p)
164 return p->buffer_end - p->buffer;
167 static av_always_inline void bytestream2_skip(GetByteContext *g,
170 g->buffer += FFMIN(g->buffer_end - g->buffer, size);
173 static av_always_inline void bytestream2_skip_p(PutByteContext *p,
179 size2 = FFMIN(p->buffer_end - p->buffer, size);
185 static av_always_inline int bytestream2_tell(GetByteContext *g)
187 return (int)(g->buffer - g->buffer_start);
190 static av_always_inline int bytestream2_tell_p(PutByteContext *p)
192 return (int)(p->buffer - p->buffer_start);
195 static av_always_inline int bytestream2_seek(GetByteContext *g,
201 offset = av_clip(offset, -(g->buffer - g->buffer_start),
202 g->buffer_end - g->buffer);
206 offset = av_clip(offset, -(g->buffer_end - g->buffer_start), 0);
207 g->buffer = g->buffer_end + offset;
210 offset = av_clip(offset, 0, g->buffer_end - g->buffer_start);
211 g->buffer = g->buffer_start + offset;
214 return AVERROR(EINVAL);
216 return bytestream2_tell(g);
219 static av_always_inline int bytestream2_seek_p(PutByteContext *p,
226 if (p->buffer_end - p->buffer < offset)
228 offset = av_clip(offset, -(p->buffer - p->buffer_start),
229 p->buffer_end - p->buffer);
235 offset = av_clip(offset, -(p->buffer_end - p->buffer_start), 0);
236 p->buffer = p->buffer_end + offset;
239 if (p->buffer_end - p->buffer_start < offset)
241 offset = av_clip(offset, 0, p->buffer_end - p->buffer_start);
242 p->buffer = p->buffer_start + offset;
245 return AVERROR(EINVAL);
247 return bytestream2_tell_p(p);
250 static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g,
254 int size2 = FFMIN(g->buffer_end - g->buffer, size);
255 memcpy(dst, g->buffer, size2);
260 static av_always_inline unsigned int bytestream2_put_buffer(PutByteContext *p,
267 size2 = FFMIN(p->buffer_end - p->buffer, size);
270 memcpy(p->buffer, src, size2);
275 static av_always_inline void bytestream2_set_buffer(PutByteContext *p,
282 size2 = FFMIN(p->buffer_end - p->buffer, size);
285 memset(p->buffer, c, size2);
289 static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p)
294 static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b,
298 memcpy(dst, *b, size);
303 static av_always_inline void bytestream_put_buffer(uint8_t **b,
307 memcpy(*b, src, size);
311 #endif /* AVCODEC_BYTESTREAM_H */