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 bytestream_get_buffer(const uint8_t **b,
335 memcpy(dst, *b, size);
340 static av_always_inline void bytestream_put_buffer(uint8_t **b,
344 memcpy(*b, src, size);
348 #endif /* AVCODEC_BYTESTREAM_H */