ADPCM Codecs
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 FFmpeg.
7  *
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.
12  *
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.
17  *
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
21  */
22 
23 #pragma once
24 
25 #include <stdint.h>
26 #include <stdio.h>
27 #include <string.h>
28 
29 #include "adpcm.h"
30 #include "assert.h"
31 #include "config-adpcm.h"
32 #include "intreadwrite.h"
33 
34 namespace adpcm_ffmpeg {
35 
36 struct GetByteContext {
37  const uint8_t *buffer, *buffer_end, *buffer_start;
38 };
39 
40 struct PutByteContext {
41  uint8_t *buffer, *buffer_end, *buffer_start;
42  int eof;
43 };
44 
45 #define DEF(type, name, bytes, read, write) \
46  static av_always_inline type bytestream_get_##name(const uint8_t **b) { \
47  (*b) += bytes; \
48  return read(*b - bytes); \
49  } \
50  static av_always_inline void bytestream_put_##name(uint8_t **b, \
51  const type value) { \
52  write(*b, value); \
53  (*b) += bytes; \
54  } \
55  static av_always_inline void bytestream2_put_##name##u(PutByteContext *p, \
56  const type value) { \
57  bytestream_put_##name(&p->buffer, value); \
58  } \
59  static av_always_inline void bytestream2_put_##name(PutByteContext *p, \
60  const type value) { \
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  return bytestream_get_##name(&g->buffer); \
69  } \
70  static av_always_inline type bytestream2_get_##name(GetByteContext *g) { \
71  if (g->buffer_end - g->buffer < bytes) { \
72  g->buffer = g->buffer_end; \
73  return 0; \
74  } \
75  return bytestream2_get_##name##u(g); \
76  } \
77  static av_always_inline type bytestream2_peek_##name##u(GetByteContext *g) { \
78  return read(g->buffer); \
79  } \
80  static av_always_inline type bytestream2_peek_##name(GetByteContext *g) { \
81  if (g->buffer_end - g->buffer < bytes) return 0; \
82  return bytestream2_peek_##name##u(g); \
83  }
84 
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)
94 
95 #if AV_HAVE_BIGENDIAN
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
112 #else
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
129 #endif
130 
131 static av_always_inline void bytestream2_init(GetByteContext *g,
132  const uint8_t *buf,
133  int buf_size) {
134  av_assert(buf_size >= 0);
135  g->buffer = buf;
136  g->buffer_start = buf;
137  g->buffer_end = buf + buf_size;
138 }
139 
140 static av_always_inline void bytestream2_init_writer(PutByteContext *p,
141  uint8_t *buf,
142  int buf_size) {
143  av_assert(buf_size >= 0);
144  p->buffer = buf;
145  p->buffer_start = buf;
146  p->buffer_end = buf + buf_size;
147  p->eof = 0;
148 }
149 
150 static av_always_inline int bytestream2_get_bytes_left(GetByteContext *g) {
151  return g->buffer_end - g->buffer;
152 }
153 
154 static av_always_inline int bytestream2_get_bytes_left_p(PutByteContext *p) {
155  return p->buffer_end - p->buffer;
156 }
157 
158 static av_always_inline void bytestream2_skip(GetByteContext *g,
159  unsigned int size) {
160  g->buffer += FFMIN(g->buffer_end - g->buffer, size);
161 }
162 
163 static av_always_inline void bytestream2_skipu(GetByteContext *g,
164  unsigned int size) {
165  g->buffer += size;
166 }
167 
168 static av_always_inline void bytestream2_skip_p(PutByteContext *p,
169  unsigned int size) {
170  unsigned int size2;
171  if (p->eof) return;
172  size2 = FFMIN(p->buffer_end - p->buffer, size);
173  if (size2 != size) p->eof = 1;
174  p->buffer += size2;
175 }
176 
177 static av_always_inline int bytestream2_tell(GetByteContext *g) {
178  return (int)(g->buffer - g->buffer_start);
179 }
180 
181 static av_always_inline int bytestream2_tell_p(PutByteContext *p) {
182  return (int)(p->buffer - p->buffer_start);
183 }
184 
185 static av_always_inline int bytestream2_size(GetByteContext *g) {
186  return (int)(g->buffer_end - g->buffer_start);
187 }
188 
189 static av_always_inline int bytestream2_size_p(PutByteContext *p) {
190  return (int)(p->buffer_end - p->buffer_start);
191 }
192 
193 static av_always_inline int bytestream2_seek(GetByteContext *g, int offset,
194  int whence) {
195  switch (whence) {
196  case SEEK_CUR:
197  offset = av_clip(offset, -(g->buffer - g->buffer_start),
198  g->buffer_end - g->buffer);
199  g->buffer += offset;
200  break;
201  case SEEK_END:
202  offset = av_clip(offset, -(g->buffer_end - g->buffer_start), 0);
203  g->buffer = g->buffer_end + offset;
204  break;
205  case SEEK_SET:
206  offset = av_clip(offset, 0, g->buffer_end - g->buffer_start);
207  g->buffer = g->buffer_start + offset;
208  break;
209  default:
210  return AVERROR(AVERROR_INVALID);
211  }
212  return bytestream2_tell(g);
213 }
214 
215 static av_always_inline int bytestream2_seek_p(PutByteContext *p, int offset,
216  int whence) {
217  p->eof = 0;
218  switch (whence) {
219  case SEEK_CUR:
220  if (p->buffer_end - p->buffer < offset) p->eof = 1;
221  offset = av_clip(offset, -(p->buffer - p->buffer_start),
222  p->buffer_end - p->buffer);
223  p->buffer += offset;
224  break;
225  case SEEK_END:
226  if (offset > 0) p->eof = 1;
227  offset = av_clip(offset, -(p->buffer_end - p->buffer_start), 0);
228  p->buffer = p->buffer_end + offset;
229  break;
230  case SEEK_SET:
231  if (p->buffer_end - p->buffer_start < offset) p->eof = 1;
232  offset = av_clip(offset, 0, p->buffer_end - p->buffer_start);
233  p->buffer = p->buffer_start + offset;
234  break;
235  default:
236  return AVERROR(AVERROR_INVALID);
237  }
238  return bytestream2_tell_p(p);
239 }
240 
241 static av_always_inline unsigned int bytestream2_get_buffer(GetByteContext *g,
242  uint8_t *dst,
243  unsigned int size) {
244  unsigned int size2 = FFMIN(g->buffer_end - g->buffer, size);
245  memcpy(dst, g->buffer, size2);
246  g->buffer += size2;
247  return size2;
248 }
249 
250 static av_always_inline unsigned int bytestream2_get_bufferu(
251  GetByteContext *g, uint8_t *dst, unsigned int size) {
252  memcpy(dst, g->buffer, size);
253  g->buffer += size;
254  return size;
255 }
256 
257 static av_always_inline unsigned int bytestream2_put_buffer(PutByteContext *p,
258  const uint8_t *src,
259  unsigned int size) {
260  unsigned int size2;
261  if (p->eof) return 0;
262  size2 = FFMIN(p->buffer_end - p->buffer, size);
263  if (size2 != size) p->eof = 1;
264  memcpy(p->buffer, src, size2);
265  p->buffer += size2;
266  return size2;
267 }
268 
269 static av_always_inline unsigned int bytestream2_put_bufferu(
270  PutByteContext *p, const uint8_t *src, unsigned int size) {
271  memcpy(p->buffer, src, size);
272  p->buffer += size;
273  return size;
274 }
275 
276 static av_always_inline void bytestream2_set_buffer(PutByteContext *p,
277  const uint8_t c,
278  unsigned int size) {
279  unsigned int size2;
280  if (p->eof) return;
281  size2 = FFMIN(p->buffer_end - p->buffer, size);
282  if (size2 != size) p->eof = 1;
283  memset(p->buffer, c, size2);
284  p->buffer += size2;
285 }
286 
287 static av_always_inline void bytestream2_set_bufferu(PutByteContext *p,
288  const uint8_t c,
289  unsigned int size) {
290  memset(p->buffer, c, size);
291  p->buffer += size;
292 }
293 
294 static av_always_inline unsigned int bytestream2_get_eof(PutByteContext *p) {
295  return p->eof;
296 }
297 
298 static av_always_inline unsigned int bytestream2_copy_bufferu(
299  PutByteContext *p, GetByteContext *g, unsigned int size) {
300  memcpy(p->buffer, g->buffer, size);
301  p->buffer += size;
302  g->buffer += size;
303  return size;
304 }
305 
306 static av_always_inline unsigned int bytestream2_copy_buffer(
307  PutByteContext *p, GetByteContext *g, unsigned int size) {
308  unsigned int size2;
309 
310  if (p->eof) return 0;
311  size = FFMIN(g->buffer_end - g->buffer, size);
312  size2 = FFMIN(p->buffer_end - p->buffer, size);
313  if (size2 != size) p->eof = 1;
314 
315  return bytestream2_copy_bufferu(p, g, size2);
316 }
317 
318 static av_always_inline unsigned int bytestream_get_buffer(const uint8_t **b,
319  uint8_t *dst,
320  unsigned int size) {
321  memcpy(dst, *b, size);
322  (*b) += size;
323  return size;
324 }
325 
326 static av_always_inline void bytestream_put_buffer(uint8_t **b,
327  const uint8_t *src,
328  unsigned int size) {
329  memcpy(*b, src, size);
330  (*b) += size;
331 }
332 
333 } // namespace adpcm_ffmpeg
adpcm_ffmpeg::GetByteContext
Definition: bytestream.h:36
adpcm_ffmpeg::PutByteContext
Definition: bytestream.h:40
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