x86: huffyuvdsp: Move inline assembly to init file
[ffmpeg.git] / libavcodec / bytestream.h
1 /*
2  * Bytestream functions
3  * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
4  * Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
5  *
6  * This file is part of Libav.
7  *
8  * Libav 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.
12  *
13  * Libav 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.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 #ifndef AVCODEC_BYTESTREAM_H
24 #define AVCODEC_BYTESTREAM_H
25
26 #include <stdint.h>
27 #include <string.h>
28
29 #include "libavutil/common.h"
30 #include "libavutil/intreadwrite.h"
31
32 typedef struct GetByteContext {
33     const uint8_t *buffer, *buffer_end, *buffer_start;
34 } GetByteContext;
35
36 typedef struct PutByteContext {
37     uint8_t *buffer, *buffer_end, *buffer_start;
38     int eof;
39 } PutByteContext;
40
41 #define DEF(type, name, bytes, read, write)                                  \
42 static av_always_inline type bytestream_get_ ## name(const uint8_t **b)        \
43 {                                                                              \
44     (*b) += bytes;                                                             \
45     return read(*b - bytes);                                                   \
46 }                                                                              \
47 static av_always_inline void bytestream_put_ ## name(uint8_t **b,              \
48                                                      const type value)         \
49 {                                                                              \
50     write(*b, value);                                                          \
51     (*b) += bytes;                                                             \
52 }                                                                              \
53 static av_always_inline void bytestream2_put_ ## name ## u(PutByteContext *p,  \
54                                                            const type value)   \
55 {                                                                              \
56     bytestream_put_ ## name(&p->buffer, value);                                \
57 }                                                                              \
58 static av_always_inline void bytestream2_put_ ## name(PutByteContext *p,       \
59                                                       const type value)        \
60 {                                                                              \
61     if (!p->eof && (p->buffer_end - p->buffer >= bytes)) {                     \
62         write(p->buffer, value);                                               \
63         p->buffer += bytes;                                                    \
64     } else                                                                     \
65         p->eof = 1;                                                            \
66 }                                                                              \
67 static av_always_inline type bytestream2_get_ ## name ## u(GetByteContext *g)  \
68 {                                                                              \
69     return bytestream_get_ ## name(&g->buffer);                                \
70 }                                                                              \
71 static av_always_inline type bytestream2_get_ ## name(GetByteContext *g)       \
72 {                                                                              \
73     if (g->buffer_end - g->buffer < bytes)                                     \
74         return 0;                                                              \
75     return bytestream2_get_ ## name ## u(g);                                   \
76 }                                                                              \
77 static av_always_inline type bytestream2_peek_ ## name(GetByteContext *g)      \
78 {                                                                              \
79     if (g->buffer_end - g->buffer < bytes)                                     \
80         return 0;                                                              \
81     return read(g->buffer);                                                    \
82 }
83
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)
93
94 #if HAVE_BIGENDIAN
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
111 #else
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
128 #endif
129
130 static av_always_inline void bytestream2_init(GetByteContext *g,
131                                               const uint8_t *buf,
132                                               int buf_size)
133 {
134     g->buffer       = buf;
135     g->buffer_start = buf;
136     g->buffer_end   = buf + buf_size;
137 }
138
139 static av_always_inline void bytestream2_init_writer(PutByteContext *p,
140                                                      uint8_t *buf,
141                                                      int buf_size)
142 {
143     p->buffer       = buf;
144     p->buffer_start = buf;
145     p->buffer_end   = buf + buf_size;
146     p->eof          = 0;
147 }
148
149 static av_always_inline unsigned int bytestream2_get_bytes_left(GetByteContext *g)
150 {
151     return g->buffer_end - g->buffer;
152 }
153
154 static av_always_inline unsigned int bytestream2_get_bytes_left_p(PutByteContext *p)
155 {
156     return p->buffer_end - p->buffer;
157 }
158
159 static av_always_inline void bytestream2_skip(GetByteContext *g,
160                                               unsigned int size)
161 {
162     g->buffer += FFMIN(g->buffer_end - g->buffer, size);
163 }
164
165 static av_always_inline void bytestream2_skipu(GetByteContext *g,
166                                                unsigned int size)
167 {
168     g->buffer += size;
169 }
170
171 static av_always_inline void bytestream2_skip_p(PutByteContext *p,
172                                                 unsigned int size)
173 {
174     int size2;
175     if (p->eof)
176         return;
177     size2 = FFMIN(p->buffer_end - p->buffer, size);
178     if (size2 != size)
179         p->eof = 1;
180     p->buffer += size2;
181 }
182
183 static av_always_inline int bytestream2_tell(GetByteContext *g)
184 {
185     return (int)(g->buffer - g->buffer_start);
186 }
187
188 static av_always_inline int bytestream2_tell_p(PutByteContext *p)
189 {
190     return (int)(p->buffer - p->buffer_start);
191 }
192
193 static av_always_inline int bytestream2_size(GetByteContext *g)
194 {
195     return (int)(g->buffer_end - g->buffer_start);
196 }
197
198 static av_always_inline int bytestream2_size_p(PutByteContext *p)
199 {
200     return (int)(p->buffer_end - p->buffer_start);
201 }
202
203 static av_always_inline int bytestream2_seek(GetByteContext *g,
204                                              int offset,
205                                              int whence)
206 {
207     switch (whence) {
208     case SEEK_CUR:
209         offset     = av_clip(offset, -(g->buffer - g->buffer_start),
210                              g->buffer_end - g->buffer);
211         g->buffer += offset;
212         break;
213     case SEEK_END:
214         offset    = av_clip(offset, -(g->buffer_end - g->buffer_start), 0);
215         g->buffer = g->buffer_end + offset;
216         break;
217     case SEEK_SET:
218         offset    = av_clip(offset, 0, g->buffer_end - g->buffer_start);
219         g->buffer = g->buffer_start + offset;
220         break;
221     default:
222         return AVERROR(EINVAL);
223     }
224     return bytestream2_tell(g);
225 }
226
227 static av_always_inline int bytestream2_seek_p(PutByteContext *p,
228                                                int offset,
229                                                int whence)
230 {
231     p->eof = 0;
232     switch (whence) {
233     case SEEK_CUR:
234         if (p->buffer_end - p->buffer < offset)
235             p->eof = 1;
236         offset     = av_clip(offset, -(p->buffer - p->buffer_start),
237                              p->buffer_end - p->buffer);
238         p->buffer += offset;
239         break;
240     case SEEK_END:
241         if (offset > 0)
242             p->eof = 1;
243         offset    = av_clip(offset, -(p->buffer_end - p->buffer_start), 0);
244         p->buffer = p->buffer_end + offset;
245         break;
246     case SEEK_SET:
247         if (p->buffer_end - p->buffer_start < offset)
248             p->eof = 1;
249         offset    = av_clip(offset, 0, p->buffer_end - p->buffer_start);
250         p->buffer = p->buffer_start + offset;
251         break;
252     default:
253         return AVERROR(EINVAL);
254     }
255     return bytestream2_tell_p(p);
256 }
257
258 static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g,
259                                                             uint8_t *dst,
260                                                             unsigned int size)
261 {
262     int size2 = FFMIN(g->buffer_end - g->buffer, size);
263     memcpy(dst, g->buffer, size2);
264     g->buffer += size2;
265     return size2;
266 }
267
268 static av_always_inline unsigned int bytestream2_get_bufferu(GetByteContext *g,
269                                                              uint8_t *dst,
270                                                              unsigned int size)
271 {
272     memcpy(dst, g->buffer, size);
273     g->buffer += size;
274     return size;
275 }
276
277 static av_always_inline unsigned int bytestream2_put_buffer(PutByteContext *p,
278                                                             const uint8_t *src,
279                                                             unsigned int size)
280 {
281     int size2;
282     if (p->eof)
283         return 0;
284     size2 = FFMIN(p->buffer_end - p->buffer, size);
285     if (size2 != size)
286         p->eof = 1;
287     memcpy(p->buffer, src, size2);
288     p->buffer += size2;
289     return size2;
290 }
291
292 static av_always_inline unsigned int bytestream2_put_bufferu(PutByteContext *p,
293                                                              const uint8_t *src,
294                                                              unsigned int size)
295 {
296     memcpy(p->buffer, src, size);
297     p->buffer += size;
298     return size;
299 }
300
301 static av_always_inline void bytestream2_set_buffer(PutByteContext *p,
302                                                     const uint8_t c,
303                                                     unsigned int size)
304 {
305     int size2;
306     if (p->eof)
307         return;
308     size2 = FFMIN(p->buffer_end - p->buffer, size);
309     if (size2 != size)
310         p->eof = 1;
311     memset(p->buffer, c, size2);
312     p->buffer += size2;
313 }
314
315 static av_always_inline void bytestream2_set_bufferu(PutByteContext *p,
316                                                      const uint8_t c,
317                                                      unsigned int size)
318 {
319     memset(p->buffer, c, size);
320     p->buffer += size;
321 }
322
323 static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p)
324 {
325     return p->eof;
326 }
327
328 static av_always_inline unsigned int bytestream2_copy_bufferu(PutByteContext *p,
329                                                               GetByteContext *g,
330                                                               unsigned int size)
331 {
332     memcpy(p->buffer, g->buffer, size);
333     p->buffer += size;
334     g->buffer += size;
335     return size;
336 }
337
338 static av_always_inline unsigned int bytestream2_copy_buffer(PutByteContext *p,
339                                                              GetByteContext *g,
340                                                              unsigned int size)
341 {
342     int size2;
343
344     if (p->eof)
345         return 0;
346     size  = FFMIN(g->buffer_end - g->buffer, size);
347     size2 = FFMIN(p->buffer_end - p->buffer, size);
348     if (size2 != size)
349         p->eof = 1;
350
351     return bytestream2_copy_bufferu(p, g, size2);
352 }
353
354 static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b,
355                                                            uint8_t *dst,
356                                                            unsigned int size)
357 {
358     memcpy(dst, *b, size);
359     (*b) += size;
360     return size;
361 }
362
363 static av_always_inline void bytestream_put_buffer(uint8_t **b,
364                                                    const uint8_t *src,
365                                                    unsigned int size)
366 {
367     memcpy(*b, src, size);
368     (*b) += size;
369 }
370
371 #endif /* AVCODEC_BYTESTREAM_H */