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diff --git a/apps/codecs/libwmapro/put_bits.h b/apps/codecs/libwmapro/put_bits.h
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1/*
2 * copyright (c) 2004 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21/**
22 * @file libavcodec/put_bits.h
23 * bitstream writer API
24 */
25
26#ifndef AVCODEC_PUT_BITS_H
27#define AVCODEC_PUT_BITS_H
28
29#include <stdint.h>
30#include <stdlib.h>
31//#include <assert.h>
32#include "libavutil/bswap.h"
33//#include "libavutil/common.h"
34//#include "libavutil/intreadwrite.h"
35//#include "libavutil/log.h"
36
37#define av_log(...)
38
39//#define ALT_BITSTREAM_WRITER
40//#define ALIGNED_BITSTREAM_WRITER
41#define HAVE_FAST_UNALIGNED 0
42/* buf and buf_end must be present and used by every alternative writer. */
43typedef struct PutBitContext {
44#ifdef ALT_BITSTREAM_WRITER
45 uint8_t *buf, *buf_end;
46 int index;
47#else
48 uint32_t bit_buf;
49 int bit_left;
50 uint8_t *buf, *buf_ptr, *buf_end;
51#endif
52 int size_in_bits;
53} PutBitContext;
54
55/**
56 * Initializes the PutBitContext s.
57 *
58 * @param buffer the buffer where to put bits
59 * @param buffer_size the size in bytes of buffer
60 */
61static inline void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
62{
63 if(buffer_size < 0) {
64 buffer_size = 0;
65 buffer = NULL;
66 }
67
68 s->size_in_bits= 8*buffer_size;
69 s->buf = buffer;
70 s->buf_end = s->buf + buffer_size;
71#ifdef ALT_BITSTREAM_WRITER
72 s->index=0;
73 ((uint32_t*)(s->buf))[0]=0;
74// memset(buffer, 0, buffer_size);
75#else
76 s->buf_ptr = s->buf;
77 s->bit_left=32;
78 s->bit_buf=0;
79#endif
80}
81
82/**
83 * Returns the total number of bits written to the bitstream.
84 */
85static inline int put_bits_count(PutBitContext *s)
86{
87#ifdef ALT_BITSTREAM_WRITER
88 return s->index;
89#else
90 return (s->buf_ptr - s->buf) * 8 + 32 - s->bit_left;
91#endif
92}
93
94/**
95 * Pads the end of the output stream with zeros.
96 */
97static inline void flush_put_bits(PutBitContext *s)
98{
99#ifdef ALT_BITSTREAM_WRITER
100 align_put_bits(s);
101#else
102#ifndef BITSTREAM_WRITER_LE
103 s->bit_buf<<= s->bit_left;
104#endif
105 while (s->bit_left < 32) {
106 /* XXX: should test end of buffer */
107#ifdef BITSTREAM_WRITER_LE
108 *s->buf_ptr++=s->bit_buf;
109 s->bit_buf>>=8;
110#else
111 *s->buf_ptr++=s->bit_buf >> 24;
112 s->bit_buf<<=8;
113#endif
114 s->bit_left+=8;
115 }
116 s->bit_left=32;
117 s->bit_buf=0;
118#endif
119}
120
121#if defined(ALT_BITSTREAM_WRITER) || defined(BITSTREAM_WRITER_LE)
122#define align_put_bits align_put_bits_unsupported_here
123#define ff_put_string ff_put_string_unsupported_here
124#define ff_copy_bits ff_copy_bits_unsupported_here
125#else
126/**
127 * Pads the bitstream with zeros up to the next byte boundary.
128 */
129void align_put_bits(PutBitContext *s);
130
131/**
132 * Puts the string string in the bitstream.
133 *
134 * @param terminate_string 0-terminates the written string if value is 1
135 */
136void ff_put_string(PutBitContext *pb, const char *string, int terminate_string);
137
138/**
139 * Copies the content of src to the bitstream.
140 *
141 * @param length the number of bits of src to copy
142 */
143void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length);
144#endif
145
146/**
147 * Writes up to 31 bits into a bitstream.
148 * Use put_bits32 to write 32 bits.
149 */
150static inline void put_bits(PutBitContext *s, int n, unsigned int value)
151#ifndef ALT_BITSTREAM_WRITER
152{
153 unsigned int bit_buf;
154 int bit_left;
155
156 // printf("put_bits=%d %x\n", n, value);
157 //assert(n <= 31 && value < (1U << n));
158
159 bit_buf = s->bit_buf;
160 bit_left = s->bit_left;
161
162 // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
163 /* XXX: optimize */
164#ifdef BITSTREAM_WRITER_LE
165 bit_buf |= value << (32 - bit_left);
166 if (n >= bit_left) {
167#if !HAVE_FAST_UNALIGNED
168 if (3 & (intptr_t) s->buf_ptr) {
169 AV_WL32(s->buf_ptr, bit_buf);
170 } else
171#endif
172 *(uint32_t *)s->buf_ptr = le2me_32(bit_buf);
173 s->buf_ptr+=4;
174 bit_buf = (bit_left==32)?0:value >> bit_left;
175 bit_left+=32;
176 }
177 bit_left-=n;
178#else
179 if (n < bit_left) {
180 bit_buf = (bit_buf<<n) | value;
181 bit_left-=n;
182 } else {
183 bit_buf<<=bit_left;
184 bit_buf |= value >> (n - bit_left);
185#if !HAVE_FAST_UNALIGNED
186 if (3 & (intptr_t) s->buf_ptr) {
187 AV_WB32(s->buf_ptr, bit_buf);
188 } else
189#endif
190 *(uint32_t *)s->buf_ptr = be2me_32(bit_buf);
191 //printf("bitbuf = %08x\n", bit_buf);
192 s->buf_ptr+=4;
193 bit_left+=32 - n;
194 bit_buf = value;
195 }
196#endif
197
198 s->bit_buf = bit_buf;
199 s->bit_left = bit_left;
200}
201#else /* ALT_BITSTREAM_WRITER defined */
202{
203# ifdef ALIGNED_BITSTREAM_WRITER
204# if ARCH_X86
205 __asm__ volatile(
206 "movl %0, %%ecx \n\t"
207 "xorl %%eax, %%eax \n\t"
208 "shrdl %%cl, %1, %%eax \n\t"
209 "shrl %%cl, %1 \n\t"
210 "movl %0, %%ecx \n\t"
211 "shrl $3, %%ecx \n\t"
212 "andl $0xFFFFFFFC, %%ecx \n\t"
213 "bswapl %1 \n\t"
214 "orl %1, (%2, %%ecx) \n\t"
215 "bswapl %%eax \n\t"
216 "addl %3, %0 \n\t"
217 "movl %%eax, 4(%2, %%ecx) \n\t"
218 : "=&r" (s->index), "=&r" (value)
219 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n))
220 : "%eax", "%ecx"
221 );
222# else
223 int index= s->index;
224 uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5);
225
226 value<<= 32-n;
227
228 ptr[0] |= be2me_32(value>>(index&31));
229 ptr[1] = be2me_32(value<<(32-(index&31)));
230//if(n>24) printf("%d %d\n", n, value);
231 index+= n;
232 s->index= index;
233# endif
234# else //ALIGNED_BITSTREAM_WRITER
235# if ARCH_X86
236 __asm__ volatile(
237 "movl $7, %%ecx \n\t"
238 "andl %0, %%ecx \n\t"
239 "addl %3, %%ecx \n\t"
240 "negl %%ecx \n\t"
241 "shll %%cl, %1 \n\t"
242 "bswapl %1 \n\t"
243 "movl %0, %%ecx \n\t"
244 "shrl $3, %%ecx \n\t"
245 "orl %1, (%%ecx, %2) \n\t"
246 "addl %3, %0 \n\t"
247 "movl $0, 4(%%ecx, %2) \n\t"
248 : "=&r" (s->index), "=&r" (value)
249 : "r" (s->buf), "r" (n), "0" (s->index), "1" (value)
250 : "%ecx"
251 );
252# else
253 int index= s->index;
254 uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3));
255
256 ptr[0] |= be2me_32(value<<(32-n-(index&7) ));
257 ptr[1] = 0;
258//if(n>24) printf("%d %d\n", n, value);
259 index+= n;
260 s->index= index;
261# endif
262# endif //!ALIGNED_BITSTREAM_WRITER
263}
264#endif
265
266static inline void put_sbits(PutBitContext *pb, int n, int32_t value)
267{
268 //assert(n >= 0 && n <= 31);
269
270 put_bits(pb, n, value & ((1<<n)-1));
271}
272
273/**
274 * Returns the pointer to the byte where the bitstream writer will put
275 * the next bit.
276 */
277static inline uint8_t* put_bits_ptr(PutBitContext *s)
278{
279#ifdef ALT_BITSTREAM_WRITER
280 return s->buf + (s->index>>3);
281#else
282 return s->buf_ptr;
283#endif
284}
285
286/**
287 * Skips the given number of bytes.
288 * PutBitContext must be flushed & aligned to a byte boundary before calling this.
289 */
290static inline void skip_put_bytes(PutBitContext *s, int n)
291{
292 //assert((put_bits_count(s)&7)==0);
293#ifdef ALT_BITSTREAM_WRITER
294 FIXME may need some cleaning of the buffer
295 s->index += n<<3;
296#else
297 //assert(s->bit_left==32);
298 s->buf_ptr += n;
299#endif
300}
301
302/**
303 * Skips the given number of bits.
304 * Must only be used if the actual values in the bitstream do not matter.
305 * If n is 0 the behavior is undefined.
306 */
307static inline void skip_put_bits(PutBitContext *s, int n)
308{
309#ifdef ALT_BITSTREAM_WRITER
310 s->index += n;
311#else
312 s->bit_left -= n;
313 s->buf_ptr-= 4*(s->bit_left>>5);
314 s->bit_left &= 31;
315#endif
316}
317
318/**
319 * Changes the end of the buffer.
320 *
321 * @param size the new size in bytes of the buffer where to put bits
322 */
323static inline void set_put_bits_buffer_size(PutBitContext *s, int size)
324{
325 s->buf_end= s->buf + size;
326}
327
328#endif /* AVCODEC_PUT_BITS_H */
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