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/common.h"
30 #include "libavutil/intreadwrite.h"
32 typedef struct GetByteContext {
33 const uint8_t *buffer, *buffer_end, *buffer_start;
36 typedef struct PutByteContext {
37 uint8_t *buffer, *buffer_end, *buffer_start;
41 #define DEF(type, name, bytes, read, write) \
42 static av_always_inline type bytestream_get_ ## name(const uint8_t **b) \
45 return read(*b - bytes); \
47 static av_always_inline void bytestream_put_ ## name(uint8_t **b, \
53 static av_always_inline void bytestream2_put_ ## name ## u(PutByteContext *p, \
56 bytestream_put_ ## name(&p->buffer, value); \
58 static av_always_inline void bytestream2_put_ ## name(PutByteContext *p, \
61 if (!p->eof && (p->buffer_end - p->buffer >= bytes)) { \
62 write(p->buffer, value); \
67 static av_always_inline type bytestream2_get_ ## name ## u(GetByteContext *g) \
69 return bytestream_get_ ## name(&g->buffer); \
71 static av_always_inline type bytestream2_get_ ## name(GetByteContext *g) \
73 if (g->buffer_end - g->buffer < bytes) \
75 return bytestream2_get_ ## name ## u(g); \
77 static av_always_inline type bytestream2_peek_ ## name(GetByteContext *g) \
79 if (g->buffer_end - g->buffer < bytes) \
81 return read(g->buffer); \
84 DEF(uint64_t, le64, 8, AV_RL64, AV_WL64)
85 DEF(unsigned int, le32, 4, AV_RL32, AV_WL32)
86 DEF(unsigned int, le24, 3, AV_RL24, AV_WL24)
87 DEF(unsigned int, le16, 2, AV_RL16, AV_WL16)
88 DEF(uint64_t, be64, 8, AV_RB64, AV_WB64)
89 DEF(unsigned int, be32, 4, AV_RB32, AV_WB32)
90 DEF(unsigned int, be24, 3, AV_RB24, AV_WB24)
91 DEF(unsigned int, be16, 2, AV_RB16, AV_WB16)
92 DEF(unsigned int, byte, 1, AV_RB8 , AV_WB8)
95 # define bytestream2_get_ne16 bytestream2_get_be16
96 # define bytestream2_get_ne24 bytestream2_get_be24
97 # define bytestream2_get_ne32 bytestream2_get_be32
98 # define bytestream2_get_ne64 bytestream2_get_be64
99 # define bytestream2_get_ne16u bytestream2_get_be16u
100 # define bytestream2_get_ne24u bytestream2_get_be24u
101 # define bytestream2_get_ne32u bytestream2_get_be32u
102 # define bytestream2_get_ne64u bytestream2_get_be64u
103 # define bytestream2_put_ne16 bytestream2_put_be16
104 # define bytestream2_put_ne24 bytestream2_put_be24
105 # define bytestream2_put_ne32 bytestream2_put_be32
106 # define bytestream2_put_ne64 bytestream2_put_be64
107 # define bytestream2_peek_ne16 bytestream2_peek_be16
108 # define bytestream2_peek_ne24 bytestream2_peek_be24
109 # define bytestream2_peek_ne32 bytestream2_peek_be32
110 # define bytestream2_peek_ne64 bytestream2_peek_be64
112 # define bytestream2_get_ne16 bytestream2_get_le16
113 # define bytestream2_get_ne24 bytestream2_get_le24
114 # define bytestream2_get_ne32 bytestream2_get_le32
115 # define bytestream2_get_ne64 bytestream2_get_le64
116 # define bytestream2_get_ne16u bytestream2_get_le16u
117 # define bytestream2_get_ne24u bytestream2_get_le24u
118 # define bytestream2_get_ne32u bytestream2_get_le32u
119 # define bytestream2_get_ne64u bytestream2_get_le64u
120 # define bytestream2_put_ne16 bytestream2_put_le16
121 # define bytestream2_put_ne24 bytestream2_put_le24
122 # define bytestream2_put_ne32 bytestream2_put_le32
123 # define bytestream2_put_ne64 bytestream2_put_le64
124 # define bytestream2_peek_ne16 bytestream2_peek_le16
125 # define bytestream2_peek_ne24 bytestream2_peek_le24
126 # define bytestream2_peek_ne32 bytestream2_peek_le32
127 # define bytestream2_peek_ne64 bytestream2_peek_le64
130 static av_always_inline void bytestream2_init(GetByteContext *g,
135 g->buffer_start = buf;
136 g->buffer_end = buf + buf_size;
139 static av_always_inline void bytestream2_init_writer(PutByteContext *p,
144 p->buffer_start = buf;
145 p->buffer_end = buf + buf_size;
149 static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
151 return g->buffer_end - g->buffer;
154 static av_always_inline unsigned int bytestream2_get_bytes_left_p(PutByteContext *p)
156 return p->buffer_end - p->buffer;
159 static av_always_inline void bytestream2_skip(GetByteContext *g,
162 g->buffer += FFMIN(g->buffer_end - g->buffer, size);
165 static av_always_inline void bytestream2_skipu(GetByteContext *g,
171 static av_always_inline void bytestream2_skip_p(PutByteContext *p,
177 size2 = FFMIN(p->buffer_end - p->buffer, size);
183 static av_always_inline int bytestream2_tell(GetByteContext *g)
185 return (int)(g->buffer - g->buffer_start);
188 static av_always_inline int bytestream2_tell_p(PutByteContext *p)
190 return (int)(p->buffer - p->buffer_start);
193 static av_always_inline int bytestream2_size(GetByteContext *g)
195 return (int)(g->buffer_end - g->buffer_start);
198 static av_always_inline int bytestream2_size_p(PutByteContext *p)
200 return (int)(p->buffer_end - p->buffer_start);
203 static av_always_inline int bytestream2_seek(GetByteContext *g,
209 offset = av_clip(offset, -(g->buffer - g->buffer_start),
210 g->buffer_end - g->buffer);
214 offset = av_clip(offset, -(g->buffer_end - g->buffer_start), 0);
215 g->buffer = g->buffer_end + offset;
218 offset = av_clip(offset, 0, g->buffer_end - g->buffer_start);
219 g->buffer = g->buffer_start + offset;
222 return AVERROR(EINVAL);
224 return bytestream2_tell(g);
227 static av_always_inline int bytestream2_seek_p(PutByteContext *p,
234 if (p->buffer_end - p->buffer < offset)
236 offset = av_clip(offset, -(p->buffer - p->buffer_start),
237 p->buffer_end - p->buffer);
243 offset = av_clip(offset, -(p->buffer_end - p->buffer_start), 0);
244 p->buffer = p->buffer_end + offset;
247 if (p->buffer_end - p->buffer_start < offset)
249 offset = av_clip(offset, 0, p->buffer_end - p->buffer_start);
250 p->buffer = p->buffer_start + offset;
253 return AVERROR(EINVAL);
255 return bytestream2_tell_p(p);
258 static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g,
262 int size2 = FFMIN(g->buffer_end - g->buffer, size);
263 memcpy(dst, g->buffer, size2);
268 static av_always_inline unsigned int bytestream2_get_bufferu(GetByteContext *g,
272 memcpy(dst, g->buffer, size);
277 static av_always_inline unsigned int bytestream2_put_buffer(PutByteContext *p,
284 size2 = FFMIN(p->buffer_end - p->buffer, size);
287 memcpy(p->buffer, src, size2);
292 static av_always_inline unsigned int bytestream2_put_bufferu(PutByteContext *p,
296 memcpy(p->buffer, src, size);
301 static av_always_inline void bytestream2_set_buffer(PutByteContext *p,
308 size2 = FFMIN(p->buffer_end - p->buffer, size);
311 memset(p->buffer, c, size2);
315 static av_always_inline void bytestream2_set_bufferu(PutByteContext *p,
319 memset(p->buffer, c, size);
323 static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p)
328 static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b,
332 memcpy(dst, *b, size);
337 static av_always_inline void bytestream_put_buffer(uint8_t **b,
341 memcpy(*b, src, size);
345 #endif /* AVCODEC_BYTESTREAM_H */