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author | Dave Chapman <dave@dchapman.com> | 2009-05-09 01:04:20 +0000 |
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committer | Dave Chapman <dave@dchapman.com> | 2009-05-09 01:04:20 +0000 |
commit | 69db01e72f2de91d35703919bfc9d0700df83e85 (patch) | |
tree | 18a8d01dc3df13c5dc51b813d7ce70e6bec79704 /apps/codecs/libcook/bitstream.h | |
parent | 681a774472eded71f7a82fbfa4c3591f3f98d209 (diff) | |
download | rockbox-69db01e72f2de91d35703919bfc9d0700df83e85.tar.gz rockbox-69db01e72f2de91d35703919bfc9d0700df83e85.zip |
Initial commit of the minimal set of ffmpeg (r18079) files required for Cook (realaudio) decoding. These are the unmodified versions from ffmpeg, committed as a base for future changes.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20882 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/codecs/libcook/bitstream.h')
-rw-r--r-- | apps/codecs/libcook/bitstream.h | 955 |
1 files changed, 955 insertions, 0 deletions
diff --git a/apps/codecs/libcook/bitstream.h b/apps/codecs/libcook/bitstream.h new file mode 100644 index 0000000000..3670285904 --- /dev/null +++ b/apps/codecs/libcook/bitstream.h | |||
@@ -0,0 +1,955 @@ | |||
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/bitstream.h | ||
23 | * bitstream api header. | ||
24 | */ | ||
25 | |||
26 | #ifndef AVCODEC_BITSTREAM_H | ||
27 | #define AVCODEC_BITSTREAM_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 | #include "mathops.h" | ||
37 | |||
38 | #if defined(ALT_BITSTREAM_READER_LE) && !defined(ALT_BITSTREAM_READER) | ||
39 | # define ALT_BITSTREAM_READER | ||
40 | #endif | ||
41 | |||
42 | //#define ALT_BITSTREAM_WRITER | ||
43 | //#define ALIGNED_BITSTREAM_WRITER | ||
44 | #if !defined(LIBMPEG2_BITSTREAM_READER) && !defined(A32_BITSTREAM_READER) && !defined(ALT_BITSTREAM_READER) | ||
45 | # if ARCH_ARM | ||
46 | # define A32_BITSTREAM_READER | ||
47 | # else | ||
48 | # define ALT_BITSTREAM_READER | ||
49 | //#define LIBMPEG2_BITSTREAM_READER | ||
50 | //#define A32_BITSTREAM_READER | ||
51 | # endif | ||
52 | #endif | ||
53 | |||
54 | extern const uint8_t ff_reverse[256]; | ||
55 | |||
56 | #if ARCH_X86 | ||
57 | // avoid +32 for shift optimization (gcc should do that ...) | ||
58 | static inline int32_t NEG_SSR32( int32_t a, int8_t s){ | ||
59 | __asm__ ("sarl %1, %0\n\t" | ||
60 | : "+r" (a) | ||
61 | : "ic" ((uint8_t)(-s)) | ||
62 | ); | ||
63 | return a; | ||
64 | } | ||
65 | static inline uint32_t NEG_USR32(uint32_t a, int8_t s){ | ||
66 | __asm__ ("shrl %1, %0\n\t" | ||
67 | : "+r" (a) | ||
68 | : "ic" ((uint8_t)(-s)) | ||
69 | ); | ||
70 | return a; | ||
71 | } | ||
72 | #else | ||
73 | # define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s))) | ||
74 | # define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s))) | ||
75 | #endif | ||
76 | |||
77 | /* bit output */ | ||
78 | |||
79 | /* buf and buf_end must be present and used by every alternative writer. */ | ||
80 | typedef struct PutBitContext { | ||
81 | #ifdef ALT_BITSTREAM_WRITER | ||
82 | uint8_t *buf, *buf_end; | ||
83 | int index; | ||
84 | #else | ||
85 | uint32_t bit_buf; | ||
86 | int bit_left; | ||
87 | uint8_t *buf, *buf_ptr, *buf_end; | ||
88 | #endif | ||
89 | int size_in_bits; | ||
90 | } PutBitContext; | ||
91 | |||
92 | static inline void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size) | ||
93 | { | ||
94 | if(buffer_size < 0) { | ||
95 | buffer_size = 0; | ||
96 | buffer = NULL; | ||
97 | } | ||
98 | |||
99 | s->size_in_bits= 8*buffer_size; | ||
100 | s->buf = buffer; | ||
101 | s->buf_end = s->buf + buffer_size; | ||
102 | #ifdef ALT_BITSTREAM_WRITER | ||
103 | s->index=0; | ||
104 | ((uint32_t*)(s->buf))[0]=0; | ||
105 | // memset(buffer, 0, buffer_size); | ||
106 | #else | ||
107 | s->buf_ptr = s->buf; | ||
108 | s->bit_left=32; | ||
109 | s->bit_buf=0; | ||
110 | #endif | ||
111 | } | ||
112 | |||
113 | /* return the number of bits output */ | ||
114 | static inline int put_bits_count(PutBitContext *s) | ||
115 | { | ||
116 | #ifdef ALT_BITSTREAM_WRITER | ||
117 | return s->index; | ||
118 | #else | ||
119 | return (s->buf_ptr - s->buf) * 8 + 32 - s->bit_left; | ||
120 | #endif | ||
121 | } | ||
122 | |||
123 | /* pad the end of the output stream with zeros */ | ||
124 | static inline void flush_put_bits(PutBitContext *s) | ||
125 | { | ||
126 | #ifdef ALT_BITSTREAM_WRITER | ||
127 | align_put_bits(s); | ||
128 | #else | ||
129 | #ifndef BITSTREAM_WRITER_LE | ||
130 | s->bit_buf<<= s->bit_left; | ||
131 | #endif | ||
132 | while (s->bit_left < 32) { | ||
133 | /* XXX: should test end of buffer */ | ||
134 | #ifdef BITSTREAM_WRITER_LE | ||
135 | *s->buf_ptr++=s->bit_buf; | ||
136 | s->bit_buf>>=8; | ||
137 | #else | ||
138 | *s->buf_ptr++=s->bit_buf >> 24; | ||
139 | s->bit_buf<<=8; | ||
140 | #endif | ||
141 | s->bit_left+=8; | ||
142 | } | ||
143 | s->bit_left=32; | ||
144 | s->bit_buf=0; | ||
145 | #endif | ||
146 | } | ||
147 | |||
148 | void align_put_bits(PutBitContext *s); | ||
149 | void ff_put_string(PutBitContext * pbc, const char *s, int put_zero); | ||
150 | void ff_copy_bits(PutBitContext *pb, const uint8_t *src, int length); | ||
151 | |||
152 | /* bit input */ | ||
153 | /* buffer, buffer_end and size_in_bits must be present and used by every reader */ | ||
154 | typedef struct GetBitContext { | ||
155 | const uint8_t *buffer, *buffer_end; | ||
156 | #ifdef ALT_BITSTREAM_READER | ||
157 | int index; | ||
158 | #elif defined LIBMPEG2_BITSTREAM_READER | ||
159 | uint8_t *buffer_ptr; | ||
160 | uint32_t cache; | ||
161 | int bit_count; | ||
162 | #elif defined A32_BITSTREAM_READER | ||
163 | uint32_t *buffer_ptr; | ||
164 | uint32_t cache0; | ||
165 | uint32_t cache1; | ||
166 | int bit_count; | ||
167 | #endif | ||
168 | int size_in_bits; | ||
169 | } GetBitContext; | ||
170 | |||
171 | #define VLC_TYPE int16_t | ||
172 | |||
173 | typedef struct VLC { | ||
174 | int bits; | ||
175 | VLC_TYPE (*table)[2]; ///< code, bits | ||
176 | int table_size, table_allocated; | ||
177 | } VLC; | ||
178 | |||
179 | typedef struct RL_VLC_ELEM { | ||
180 | int16_t level; | ||
181 | int8_t len; | ||
182 | uint8_t run; | ||
183 | } RL_VLC_ELEM; | ||
184 | |||
185 | #ifndef ALT_BITSTREAM_WRITER | ||
186 | static inline void put_bits(PutBitContext *s, int n, unsigned int value) | ||
187 | { | ||
188 | unsigned int bit_buf; | ||
189 | int bit_left; | ||
190 | |||
191 | // printf("put_bits=%d %x\n", n, value); | ||
192 | assert(n == 32 || value < (1U << n)); | ||
193 | |||
194 | bit_buf = s->bit_buf; | ||
195 | bit_left = s->bit_left; | ||
196 | |||
197 | // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf); | ||
198 | /* XXX: optimize */ | ||
199 | #ifdef BITSTREAM_WRITER_LE | ||
200 | bit_buf |= value << (32 - bit_left); | ||
201 | if (n >= bit_left) { | ||
202 | #if !HAVE_FAST_UNALIGNED | ||
203 | if (3 & (intptr_t) s->buf_ptr) { | ||
204 | AV_WL32(s->buf_ptr, bit_buf); | ||
205 | } else | ||
206 | #endif | ||
207 | *(uint32_t *)s->buf_ptr = le2me_32(bit_buf); | ||
208 | s->buf_ptr+=4; | ||
209 | bit_buf = (bit_left==32)?0:value >> bit_left; | ||
210 | bit_left+=32; | ||
211 | } | ||
212 | bit_left-=n; | ||
213 | #else | ||
214 | if (n < bit_left) { | ||
215 | bit_buf = (bit_buf<<n) | value; | ||
216 | bit_left-=n; | ||
217 | } else { | ||
218 | bit_buf<<=bit_left; | ||
219 | bit_buf |= value >> (n - bit_left); | ||
220 | #if !HAVE_FAST_UNALIGNED | ||
221 | if (3 & (intptr_t) s->buf_ptr) { | ||
222 | AV_WB32(s->buf_ptr, bit_buf); | ||
223 | } else | ||
224 | #endif | ||
225 | *(uint32_t *)s->buf_ptr = be2me_32(bit_buf); | ||
226 | //printf("bitbuf = %08x\n", bit_buf); | ||
227 | s->buf_ptr+=4; | ||
228 | bit_left+=32 - n; | ||
229 | bit_buf = value; | ||
230 | } | ||
231 | #endif | ||
232 | |||
233 | s->bit_buf = bit_buf; | ||
234 | s->bit_left = bit_left; | ||
235 | } | ||
236 | #endif | ||
237 | |||
238 | |||
239 | #ifdef ALT_BITSTREAM_WRITER | ||
240 | static inline void put_bits(PutBitContext *s, int n, unsigned int value) | ||
241 | { | ||
242 | # ifdef ALIGNED_BITSTREAM_WRITER | ||
243 | # if ARCH_X86 | ||
244 | __asm__ volatile( | ||
245 | "movl %0, %%ecx \n\t" | ||
246 | "xorl %%eax, %%eax \n\t" | ||
247 | "shrdl %%cl, %1, %%eax \n\t" | ||
248 | "shrl %%cl, %1 \n\t" | ||
249 | "movl %0, %%ecx \n\t" | ||
250 | "shrl $3, %%ecx \n\t" | ||
251 | "andl $0xFFFFFFFC, %%ecx \n\t" | ||
252 | "bswapl %1 \n\t" | ||
253 | "orl %1, (%2, %%ecx) \n\t" | ||
254 | "bswapl %%eax \n\t" | ||
255 | "addl %3, %0 \n\t" | ||
256 | "movl %%eax, 4(%2, %%ecx) \n\t" | ||
257 | : "=&r" (s->index), "=&r" (value) | ||
258 | : "r" (s->buf), "r" (n), "0" (s->index), "1" (value<<(-n)) | ||
259 | : "%eax", "%ecx" | ||
260 | ); | ||
261 | # else | ||
262 | int index= s->index; | ||
263 | uint32_t *ptr= ((uint32_t *)s->buf)+(index>>5); | ||
264 | |||
265 | value<<= 32-n; | ||
266 | |||
267 | ptr[0] |= be2me_32(value>>(index&31)); | ||
268 | ptr[1] = be2me_32(value<<(32-(index&31))); | ||
269 | //if(n>24) printf("%d %d\n", n, value); | ||
270 | index+= n; | ||
271 | s->index= index; | ||
272 | # endif | ||
273 | # else //ALIGNED_BITSTREAM_WRITER | ||
274 | # if ARCH_X86 | ||
275 | __asm__ volatile( | ||
276 | "movl $7, %%ecx \n\t" | ||
277 | "andl %0, %%ecx \n\t" | ||
278 | "addl %3, %%ecx \n\t" | ||
279 | "negl %%ecx \n\t" | ||
280 | "shll %%cl, %1 \n\t" | ||
281 | "bswapl %1 \n\t" | ||
282 | "movl %0, %%ecx \n\t" | ||
283 | "shrl $3, %%ecx \n\t" | ||
284 | "orl %1, (%%ecx, %2) \n\t" | ||
285 | "addl %3, %0 \n\t" | ||
286 | "movl $0, 4(%%ecx, %2) \n\t" | ||
287 | : "=&r" (s->index), "=&r" (value) | ||
288 | : "r" (s->buf), "r" (n), "0" (s->index), "1" (value) | ||
289 | : "%ecx" | ||
290 | ); | ||
291 | # else | ||
292 | int index= s->index; | ||
293 | uint32_t *ptr= (uint32_t*)(((uint8_t *)s->buf)+(index>>3)); | ||
294 | |||
295 | ptr[0] |= be2me_32(value<<(32-n-(index&7) )); | ||
296 | ptr[1] = 0; | ||
297 | //if(n>24) printf("%d %d\n", n, value); | ||
298 | index+= n; | ||
299 | s->index= index; | ||
300 | # endif | ||
301 | # endif //!ALIGNED_BITSTREAM_WRITER | ||
302 | } | ||
303 | #endif | ||
304 | |||
305 | static inline void put_sbits(PutBitContext *pb, int bits, int32_t val) | ||
306 | { | ||
307 | assert(bits >= 0 && bits <= 31); | ||
308 | |||
309 | put_bits(pb, bits, val & ((1<<bits)-1)); | ||
310 | } | ||
311 | |||
312 | |||
313 | static inline uint8_t* pbBufPtr(PutBitContext *s) | ||
314 | { | ||
315 | #ifdef ALT_BITSTREAM_WRITER | ||
316 | return s->buf + (s->index>>3); | ||
317 | #else | ||
318 | return s->buf_ptr; | ||
319 | #endif | ||
320 | } | ||
321 | |||
322 | /** | ||
323 | * | ||
324 | * PutBitContext must be flushed & aligned to a byte boundary before calling this. | ||
325 | */ | ||
326 | static inline void skip_put_bytes(PutBitContext *s, int n){ | ||
327 | assert((put_bits_count(s)&7)==0); | ||
328 | #ifdef ALT_BITSTREAM_WRITER | ||
329 | FIXME may need some cleaning of the buffer | ||
330 | s->index += n<<3; | ||
331 | #else | ||
332 | assert(s->bit_left==32); | ||
333 | s->buf_ptr += n; | ||
334 | #endif | ||
335 | } | ||
336 | |||
337 | /** | ||
338 | * Skips the given number of bits. | ||
339 | * Must only be used if the actual values in the bitstream do not matter. | ||
340 | */ | ||
341 | static inline void skip_put_bits(PutBitContext *s, int n){ | ||
342 | #ifdef ALT_BITSTREAM_WRITER | ||
343 | s->index += n; | ||
344 | #else | ||
345 | s->bit_left -= n; | ||
346 | s->buf_ptr-= s->bit_left>>5; | ||
347 | s->bit_left &= 31; | ||
348 | #endif | ||
349 | } | ||
350 | |||
351 | /** | ||
352 | * Changes the end of the buffer. | ||
353 | */ | ||
354 | static inline void set_put_bits_buffer_size(PutBitContext *s, int size){ | ||
355 | s->buf_end= s->buf + size; | ||
356 | } | ||
357 | |||
358 | /* Bitstream reader API docs: | ||
359 | name | ||
360 | arbitrary name which is used as prefix for the internal variables | ||
361 | |||
362 | gb | ||
363 | getbitcontext | ||
364 | |||
365 | OPEN_READER(name, gb) | ||
366 | loads gb into local variables | ||
367 | |||
368 | CLOSE_READER(name, gb) | ||
369 | stores local vars in gb | ||
370 | |||
371 | UPDATE_CACHE(name, gb) | ||
372 | refills the internal cache from the bitstream | ||
373 | after this call at least MIN_CACHE_BITS will be available, | ||
374 | |||
375 | GET_CACHE(name, gb) | ||
376 | will output the contents of the internal cache, next bit is MSB of 32 or 64 bit (FIXME 64bit) | ||
377 | |||
378 | SHOW_UBITS(name, gb, num) | ||
379 | will return the next num bits | ||
380 | |||
381 | SHOW_SBITS(name, gb, num) | ||
382 | will return the next num bits and do sign extension | ||
383 | |||
384 | SKIP_BITS(name, gb, num) | ||
385 | will skip over the next num bits | ||
386 | note, this is equivalent to SKIP_CACHE; SKIP_COUNTER | ||
387 | |||
388 | SKIP_CACHE(name, gb, num) | ||
389 | will remove the next num bits from the cache (note SKIP_COUNTER MUST be called before UPDATE_CACHE / CLOSE_READER) | ||
390 | |||
391 | SKIP_COUNTER(name, gb, num) | ||
392 | will increment the internal bit counter (see SKIP_CACHE & SKIP_BITS) | ||
393 | |||
394 | LAST_SKIP_CACHE(name, gb, num) | ||
395 | will remove the next num bits from the cache if it is needed for UPDATE_CACHE otherwise it will do nothing | ||
396 | |||
397 | LAST_SKIP_BITS(name, gb, num) | ||
398 | is equivalent to SKIP_LAST_CACHE; SKIP_COUNTER | ||
399 | |||
400 | for examples see get_bits, show_bits, skip_bits, get_vlc | ||
401 | */ | ||
402 | |||
403 | #ifdef ALT_BITSTREAM_READER | ||
404 | # define MIN_CACHE_BITS 25 | ||
405 | |||
406 | # define OPEN_READER(name, gb)\ | ||
407 | int name##_index= (gb)->index;\ | ||
408 | int name##_cache= 0;\ | ||
409 | |||
410 | # define CLOSE_READER(name, gb)\ | ||
411 | (gb)->index= name##_index;\ | ||
412 | |||
413 | # ifdef ALT_BITSTREAM_READER_LE | ||
414 | # define UPDATE_CACHE(name, gb)\ | ||
415 | name##_cache= AV_RL32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) >> (name##_index&0x07);\ | ||
416 | |||
417 | # define SKIP_CACHE(name, gb, num)\ | ||
418 | name##_cache >>= (num); | ||
419 | # else | ||
420 | # define UPDATE_CACHE(name, gb)\ | ||
421 | name##_cache= AV_RB32( ((const uint8_t *)(gb)->buffer)+(name##_index>>3) ) << (name##_index&0x07);\ | ||
422 | |||
423 | # define SKIP_CACHE(name, gb, num)\ | ||
424 | name##_cache <<= (num); | ||
425 | # endif | ||
426 | |||
427 | // FIXME name? | ||
428 | # define SKIP_COUNTER(name, gb, num)\ | ||
429 | name##_index += (num);\ | ||
430 | |||
431 | # define SKIP_BITS(name, gb, num)\ | ||
432 | {\ | ||
433 | SKIP_CACHE(name, gb, num)\ | ||
434 | SKIP_COUNTER(name, gb, num)\ | ||
435 | }\ | ||
436 | |||
437 | # define LAST_SKIP_BITS(name, gb, num) SKIP_COUNTER(name, gb, num) | ||
438 | # define LAST_SKIP_CACHE(name, gb, num) ; | ||
439 | |||
440 | # ifdef ALT_BITSTREAM_READER_LE | ||
441 | # define SHOW_UBITS(name, gb, num)\ | ||
442 | ((name##_cache) & (NEG_USR32(0xffffffff,num))) | ||
443 | |||
444 | # define SHOW_SBITS(name, gb, num)\ | ||
445 | NEG_SSR32((name##_cache)<<(32-(num)), num) | ||
446 | # else | ||
447 | # define SHOW_UBITS(name, gb, num)\ | ||
448 | NEG_USR32(name##_cache, num) | ||
449 | |||
450 | # define SHOW_SBITS(name, gb, num)\ | ||
451 | NEG_SSR32(name##_cache, num) | ||
452 | # endif | ||
453 | |||
454 | # define GET_CACHE(name, gb)\ | ||
455 | ((uint32_t)name##_cache) | ||
456 | |||
457 | static inline int get_bits_count(GetBitContext *s){ | ||
458 | return s->index; | ||
459 | } | ||
460 | |||
461 | static inline void skip_bits_long(GetBitContext *s, int n){ | ||
462 | s->index += n; | ||
463 | } | ||
464 | |||
465 | #elif defined LIBMPEG2_BITSTREAM_READER | ||
466 | //libmpeg2 like reader | ||
467 | |||
468 | # define MIN_CACHE_BITS 17 | ||
469 | |||
470 | # define OPEN_READER(name, gb)\ | ||
471 | int name##_bit_count=(gb)->bit_count;\ | ||
472 | int name##_cache= (gb)->cache;\ | ||
473 | uint8_t * name##_buffer_ptr=(gb)->buffer_ptr;\ | ||
474 | |||
475 | # define CLOSE_READER(name, gb)\ | ||
476 | (gb)->bit_count= name##_bit_count;\ | ||
477 | (gb)->cache= name##_cache;\ | ||
478 | (gb)->buffer_ptr= name##_buffer_ptr;\ | ||
479 | |||
480 | # define UPDATE_CACHE(name, gb)\ | ||
481 | if(name##_bit_count >= 0){\ | ||
482 | name##_cache+= AV_RB16(name##_buffer_ptr) << name##_bit_count; \ | ||
483 | name##_buffer_ptr+=2;\ | ||
484 | name##_bit_count-= 16;\ | ||
485 | }\ | ||
486 | |||
487 | # define SKIP_CACHE(name, gb, num)\ | ||
488 | name##_cache <<= (num);\ | ||
489 | |||
490 | # define SKIP_COUNTER(name, gb, num)\ | ||
491 | name##_bit_count += (num);\ | ||
492 | |||
493 | # define SKIP_BITS(name, gb, num)\ | ||
494 | {\ | ||
495 | SKIP_CACHE(name, gb, num)\ | ||
496 | SKIP_COUNTER(name, gb, num)\ | ||
497 | }\ | ||
498 | |||
499 | # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num) | ||
500 | # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num) | ||
501 | |||
502 | # define SHOW_UBITS(name, gb, num)\ | ||
503 | NEG_USR32(name##_cache, num) | ||
504 | |||
505 | # define SHOW_SBITS(name, gb, num)\ | ||
506 | NEG_SSR32(name##_cache, num) | ||
507 | |||
508 | # define GET_CACHE(name, gb)\ | ||
509 | ((uint32_t)name##_cache) | ||
510 | |||
511 | static inline int get_bits_count(GetBitContext *s){ | ||
512 | return (s->buffer_ptr - s->buffer)*8 - 16 + s->bit_count; | ||
513 | } | ||
514 | |||
515 | static inline void skip_bits_long(GetBitContext *s, int n){ | ||
516 | OPEN_READER(re, s) | ||
517 | re_bit_count += n; | ||
518 | re_buffer_ptr += 2*(re_bit_count>>4); | ||
519 | re_bit_count &= 15; | ||
520 | re_cache = ((re_buffer_ptr[-2]<<8) + re_buffer_ptr[-1]) << (16+re_bit_count); | ||
521 | UPDATE_CACHE(re, s) | ||
522 | CLOSE_READER(re, s) | ||
523 | } | ||
524 | |||
525 | #elif defined A32_BITSTREAM_READER | ||
526 | |||
527 | # define MIN_CACHE_BITS 32 | ||
528 | |||
529 | # define OPEN_READER(name, gb)\ | ||
530 | int name##_bit_count=(gb)->bit_count;\ | ||
531 | uint32_t name##_cache0= (gb)->cache0;\ | ||
532 | uint32_t name##_cache1= (gb)->cache1;\ | ||
533 | uint32_t * name##_buffer_ptr=(gb)->buffer_ptr;\ | ||
534 | |||
535 | # define CLOSE_READER(name, gb)\ | ||
536 | (gb)->bit_count= name##_bit_count;\ | ||
537 | (gb)->cache0= name##_cache0;\ | ||
538 | (gb)->cache1= name##_cache1;\ | ||
539 | (gb)->buffer_ptr= name##_buffer_ptr;\ | ||
540 | |||
541 | # define UPDATE_CACHE(name, gb)\ | ||
542 | if(name##_bit_count > 0){\ | ||
543 | const uint32_t next= be2me_32( *name##_buffer_ptr );\ | ||
544 | name##_cache0 |= NEG_USR32(next,name##_bit_count);\ | ||
545 | name##_cache1 |= next<<name##_bit_count;\ | ||
546 | name##_buffer_ptr++;\ | ||
547 | name##_bit_count-= 32;\ | ||
548 | }\ | ||
549 | |||
550 | #if ARCH_X86 | ||
551 | # define SKIP_CACHE(name, gb, num)\ | ||
552 | __asm__(\ | ||
553 | "shldl %2, %1, %0 \n\t"\ | ||
554 | "shll %2, %1 \n\t"\ | ||
555 | : "+r" (name##_cache0), "+r" (name##_cache1)\ | ||
556 | : "Ic" ((uint8_t)(num))\ | ||
557 | ); | ||
558 | #else | ||
559 | # define SKIP_CACHE(name, gb, num)\ | ||
560 | name##_cache0 <<= (num);\ | ||
561 | name##_cache0 |= NEG_USR32(name##_cache1,num);\ | ||
562 | name##_cache1 <<= (num); | ||
563 | #endif | ||
564 | |||
565 | # define SKIP_COUNTER(name, gb, num)\ | ||
566 | name##_bit_count += (num);\ | ||
567 | |||
568 | # define SKIP_BITS(name, gb, num)\ | ||
569 | {\ | ||
570 | SKIP_CACHE(name, gb, num)\ | ||
571 | SKIP_COUNTER(name, gb, num)\ | ||
572 | }\ | ||
573 | |||
574 | # define LAST_SKIP_BITS(name, gb, num) SKIP_BITS(name, gb, num) | ||
575 | # define LAST_SKIP_CACHE(name, gb, num) SKIP_CACHE(name, gb, num) | ||
576 | |||
577 | # define SHOW_UBITS(name, gb, num)\ | ||
578 | NEG_USR32(name##_cache0, num) | ||
579 | |||
580 | # define SHOW_SBITS(name, gb, num)\ | ||
581 | NEG_SSR32(name##_cache0, num) | ||
582 | |||
583 | # define GET_CACHE(name, gb)\ | ||
584 | (name##_cache0) | ||
585 | |||
586 | static inline int get_bits_count(GetBitContext *s){ | ||
587 | return ((uint8_t*)s->buffer_ptr - s->buffer)*8 - 32 + s->bit_count; | ||
588 | } | ||
589 | |||
590 | static inline void skip_bits_long(GetBitContext *s, int n){ | ||
591 | OPEN_READER(re, s) | ||
592 | re_bit_count += n; | ||
593 | re_buffer_ptr += re_bit_count>>5; | ||
594 | re_bit_count &= 31; | ||
595 | re_cache0 = be2me_32( re_buffer_ptr[-1] ) << re_bit_count; | ||
596 | re_cache1 = 0; | ||
597 | UPDATE_CACHE(re, s) | ||
598 | CLOSE_READER(re, s) | ||
599 | } | ||
600 | |||
601 | #endif | ||
602 | |||
603 | /** | ||
604 | * read mpeg1 dc style vlc (sign bit + mantisse with no MSB). | ||
605 | * if MSB not set it is negative | ||
606 | * @param n length in bits | ||
607 | * @author BERO | ||
608 | */ | ||
609 | static inline int get_xbits(GetBitContext *s, int n){ | ||
610 | register int sign; | ||
611 | register int32_t cache; | ||
612 | OPEN_READER(re, s) | ||
613 | UPDATE_CACHE(re, s) | ||
614 | cache = GET_CACHE(re,s); | ||
615 | sign=(~cache)>>31; | ||
616 | LAST_SKIP_BITS(re, s, n) | ||
617 | CLOSE_READER(re, s) | ||
618 | return (NEG_USR32(sign ^ cache, n) ^ sign) - sign; | ||
619 | } | ||
620 | |||
621 | static inline int get_sbits(GetBitContext *s, int n){ | ||
622 | register int tmp; | ||
623 | OPEN_READER(re, s) | ||
624 | UPDATE_CACHE(re, s) | ||
625 | tmp= SHOW_SBITS(re, s, n); | ||
626 | LAST_SKIP_BITS(re, s, n) | ||
627 | CLOSE_READER(re, s) | ||
628 | return tmp; | ||
629 | } | ||
630 | |||
631 | /** | ||
632 | * reads 1-17 bits. | ||
633 | * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't | ||
634 | */ | ||
635 | static inline unsigned int get_bits(GetBitContext *s, int n){ | ||
636 | register int tmp; | ||
637 | OPEN_READER(re, s) | ||
638 | UPDATE_CACHE(re, s) | ||
639 | tmp= SHOW_UBITS(re, s, n); | ||
640 | LAST_SKIP_BITS(re, s, n) | ||
641 | CLOSE_READER(re, s) | ||
642 | return tmp; | ||
643 | } | ||
644 | |||
645 | /** | ||
646 | * shows 1-17 bits. | ||
647 | * Note, the alt bitstream reader can read up to 25 bits, but the libmpeg2 reader can't | ||
648 | */ | ||
649 | static inline unsigned int show_bits(GetBitContext *s, int n){ | ||
650 | register int tmp; | ||
651 | OPEN_READER(re, s) | ||
652 | UPDATE_CACHE(re, s) | ||
653 | tmp= SHOW_UBITS(re, s, n); | ||
654 | // CLOSE_READER(re, s) | ||
655 | return tmp; | ||
656 | } | ||
657 | |||
658 | static inline void skip_bits(GetBitContext *s, int n){ | ||
659 | //Note gcc seems to optimize this to s->index+=n for the ALT_READER :)) | ||
660 | OPEN_READER(re, s) | ||
661 | UPDATE_CACHE(re, s) | ||
662 | LAST_SKIP_BITS(re, s, n) | ||
663 | CLOSE_READER(re, s) | ||
664 | } | ||
665 | |||
666 | static inline unsigned int get_bits1(GetBitContext *s){ | ||
667 | #ifdef ALT_BITSTREAM_READER | ||
668 | int index= s->index; | ||
669 | uint8_t result= s->buffer[ index>>3 ]; | ||
670 | #ifdef ALT_BITSTREAM_READER_LE | ||
671 | result>>= (index&0x07); | ||
672 | result&= 1; | ||
673 | #else | ||
674 | result<<= (index&0x07); | ||
675 | result>>= 8 - 1; | ||
676 | #endif | ||
677 | index++; | ||
678 | s->index= index; | ||
679 | |||
680 | return result; | ||
681 | #else | ||
682 | return get_bits(s, 1); | ||
683 | #endif | ||
684 | } | ||
685 | |||
686 | static inline unsigned int show_bits1(GetBitContext *s){ | ||
687 | return show_bits(s, 1); | ||
688 | } | ||
689 | |||
690 | static inline void skip_bits1(GetBitContext *s){ | ||
691 | skip_bits(s, 1); | ||
692 | } | ||
693 | |||
694 | /** | ||
695 | * reads 0-32 bits. | ||
696 | */ | ||
697 | static inline unsigned int get_bits_long(GetBitContext *s, int n){ | ||
698 | if(n<=17) return get_bits(s, n); | ||
699 | else{ | ||
700 | #ifdef ALT_BITSTREAM_READER_LE | ||
701 | int ret= get_bits(s, 16); | ||
702 | return ret | (get_bits(s, n-16) << 16); | ||
703 | #else | ||
704 | int ret= get_bits(s, 16) << (n-16); | ||
705 | return ret | get_bits(s, n-16); | ||
706 | #endif | ||
707 | } | ||
708 | } | ||
709 | |||
710 | /** | ||
711 | * reads 0-32 bits as a signed integer. | ||
712 | */ | ||
713 | static inline int get_sbits_long(GetBitContext *s, int n) { | ||
714 | return sign_extend(get_bits_long(s, n), n); | ||
715 | } | ||
716 | |||
717 | /** | ||
718 | * shows 0-32 bits. | ||
719 | */ | ||
720 | static inline unsigned int show_bits_long(GetBitContext *s, int n){ | ||
721 | if(n<=17) return show_bits(s, n); | ||
722 | else{ | ||
723 | GetBitContext gb= *s; | ||
724 | return get_bits_long(&gb, n); | ||
725 | } | ||
726 | } | ||
727 | |||
728 | static inline int check_marker(GetBitContext *s, const char *msg) | ||
729 | { | ||
730 | int bit= get_bits1(s); | ||
731 | if(!bit) | ||
732 | av_log(NULL, AV_LOG_INFO, "Marker bit missing %s\n", msg); | ||
733 | |||
734 | return bit; | ||
735 | } | ||
736 | |||
737 | /** | ||
738 | * init GetBitContext. | ||
739 | * @param buffer bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE bytes larger then the actual read bits | ||
740 | * because some optimized bitstream readers read 32 or 64 bit at once and could read over the end | ||
741 | * @param bit_size the size of the buffer in bits | ||
742 | */ | ||
743 | static inline void init_get_bits(GetBitContext *s, | ||
744 | const uint8_t *buffer, int bit_size) | ||
745 | { | ||
746 | int buffer_size= (bit_size+7)>>3; | ||
747 | if(buffer_size < 0 || bit_size < 0) { | ||
748 | buffer_size = bit_size = 0; | ||
749 | buffer = NULL; | ||
750 | } | ||
751 | |||
752 | s->buffer= buffer; | ||
753 | s->size_in_bits= bit_size; | ||
754 | s->buffer_end= buffer + buffer_size; | ||
755 | #ifdef ALT_BITSTREAM_READER | ||
756 | s->index=0; | ||
757 | #elif defined LIBMPEG2_BITSTREAM_READER | ||
758 | s->buffer_ptr = (uint8_t*)((intptr_t)buffer&(~1)); | ||
759 | s->bit_count = 16 + 8*((intptr_t)buffer&1); | ||
760 | skip_bits_long(s, 0); | ||
761 | #elif defined A32_BITSTREAM_READER | ||
762 | s->buffer_ptr = (uint32_t*)((intptr_t)buffer&(~3)); | ||
763 | s->bit_count = 32 + 8*((intptr_t)buffer&3); | ||
764 | skip_bits_long(s, 0); | ||
765 | #endif | ||
766 | } | ||
767 | |||
768 | static inline void align_get_bits(GetBitContext *s) | ||
769 | { | ||
770 | int n= (-get_bits_count(s)) & 7; | ||
771 | if(n) skip_bits(s, n); | ||
772 | } | ||
773 | |||
774 | #define init_vlc(vlc, nb_bits, nb_codes,\ | ||
775 | bits, bits_wrap, bits_size,\ | ||
776 | codes, codes_wrap, codes_size,\ | ||
777 | flags)\ | ||
778 | init_vlc_sparse(vlc, nb_bits, nb_codes,\ | ||
779 | bits, bits_wrap, bits_size,\ | ||
780 | codes, codes_wrap, codes_size,\ | ||
781 | NULL, 0, 0, flags) | ||
782 | |||
783 | int init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes, | ||
784 | const void *bits, int bits_wrap, int bits_size, | ||
785 | const void *codes, int codes_wrap, int codes_size, | ||
786 | const void *symbols, int symbols_wrap, int symbols_size, | ||
787 | int flags); | ||
788 | #define INIT_VLC_USE_STATIC 1 ///< VERY strongly deprecated and forbidden | ||
789 | #define INIT_VLC_LE 2 | ||
790 | #define INIT_VLC_USE_NEW_STATIC 4 | ||
791 | void free_vlc(VLC *vlc); | ||
792 | |||
793 | #define INIT_VLC_STATIC(vlc, bits, a,b,c,d,e,f,g, static_size)\ | ||
794 | {\ | ||
795 | static VLC_TYPE table[static_size][2];\ | ||
796 | (vlc)->table= table;\ | ||
797 | (vlc)->table_allocated= static_size;\ | ||
798 | init_vlc(vlc, bits, a,b,c,d,e,f,g, INIT_VLC_USE_NEW_STATIC);\ | ||
799 | } | ||
800 | |||
801 | |||
802 | /** | ||
803 | * | ||
804 | * if the vlc code is invalid and max_depth=1 than no bits will be removed | ||
805 | * if the vlc code is invalid and max_depth>1 than the number of bits removed | ||
806 | * is undefined | ||
807 | */ | ||
808 | #define GET_VLC(code, name, gb, table, bits, max_depth)\ | ||
809 | {\ | ||
810 | int n, index, nb_bits;\ | ||
811 | \ | ||
812 | index= SHOW_UBITS(name, gb, bits);\ | ||
813 | code = table[index][0];\ | ||
814 | n = table[index][1];\ | ||
815 | \ | ||
816 | if(max_depth > 1 && n < 0){\ | ||
817 | LAST_SKIP_BITS(name, gb, bits)\ | ||
818 | UPDATE_CACHE(name, gb)\ | ||
819 | \ | ||
820 | nb_bits = -n;\ | ||
821 | \ | ||
822 | index= SHOW_UBITS(name, gb, nb_bits) + code;\ | ||
823 | code = table[index][0];\ | ||
824 | n = table[index][1];\ | ||
825 | if(max_depth > 2 && n < 0){\ | ||
826 | LAST_SKIP_BITS(name, gb, nb_bits)\ | ||
827 | UPDATE_CACHE(name, gb)\ | ||
828 | \ | ||
829 | nb_bits = -n;\ | ||
830 | \ | ||
831 | index= SHOW_UBITS(name, gb, nb_bits) + code;\ | ||
832 | code = table[index][0];\ | ||
833 | n = table[index][1];\ | ||
834 | }\ | ||
835 | }\ | ||
836 | SKIP_BITS(name, gb, n)\ | ||
837 | } | ||
838 | |||
839 | #define GET_RL_VLC(level, run, name, gb, table, bits, max_depth, need_update)\ | ||
840 | {\ | ||
841 | int n, index, nb_bits;\ | ||
842 | \ | ||
843 | index= SHOW_UBITS(name, gb, bits);\ | ||
844 | level = table[index].level;\ | ||
845 | n = table[index].len;\ | ||
846 | \ | ||
847 | if(max_depth > 1 && n < 0){\ | ||
848 | SKIP_BITS(name, gb, bits)\ | ||
849 | if(need_update){\ | ||
850 | UPDATE_CACHE(name, gb)\ | ||
851 | }\ | ||
852 | \ | ||
853 | nb_bits = -n;\ | ||
854 | \ | ||
855 | index= SHOW_UBITS(name, gb, nb_bits) + level;\ | ||
856 | level = table[index].level;\ | ||
857 | n = table[index].len;\ | ||
858 | }\ | ||
859 | run= table[index].run;\ | ||
860 | SKIP_BITS(name, gb, n)\ | ||
861 | } | ||
862 | |||
863 | |||
864 | /** | ||
865 | * parses a vlc code, faster then get_vlc() | ||
866 | * @param bits is the number of bits which will be read at once, must be | ||
867 | * identical to nb_bits in init_vlc() | ||
868 | * @param max_depth is the number of times bits bits must be read to completely | ||
869 | * read the longest vlc code | ||
870 | * = (max_vlc_length + bits - 1) / bits | ||
871 | */ | ||
872 | static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE (*table)[2], | ||
873 | int bits, int max_depth) | ||
874 | { | ||
875 | int code; | ||
876 | |||
877 | OPEN_READER(re, s) | ||
878 | UPDATE_CACHE(re, s) | ||
879 | |||
880 | GET_VLC(code, re, s, table, bits, max_depth) | ||
881 | |||
882 | CLOSE_READER(re, s) | ||
883 | return code; | ||
884 | } | ||
885 | |||
886 | //#define TRACE | ||
887 | |||
888 | #ifdef TRACE | ||
889 | static inline void print_bin(int bits, int n){ | ||
890 | int i; | ||
891 | |||
892 | for(i=n-1; i>=0; i--){ | ||
893 | av_log(NULL, AV_LOG_DEBUG, "%d", (bits>>i)&1); | ||
894 | } | ||
895 | for(i=n; i<24; i++) | ||
896 | av_log(NULL, AV_LOG_DEBUG, " "); | ||
897 | } | ||
898 | |||
899 | static inline int get_bits_trace(GetBitContext *s, int n, char *file, const char *func, int line){ | ||
900 | int r= get_bits(s, n); | ||
901 | |||
902 | print_bin(r, n); | ||
903 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d bit @%5d in %s %s:%d\n", r, n, r, get_bits_count(s)-n, file, func, line); | ||
904 | return r; | ||
905 | } | ||
906 | static inline int get_vlc_trace(GetBitContext *s, VLC_TYPE (*table)[2], int bits, int max_depth, char *file, const char *func, int line){ | ||
907 | int show= show_bits(s, 24); | ||
908 | int pos= get_bits_count(s); | ||
909 | int r= get_vlc2(s, table, bits, max_depth); | ||
910 | int len= get_bits_count(s) - pos; | ||
911 | int bits2= show>>(24-len); | ||
912 | |||
913 | print_bin(bits2, len); | ||
914 | |||
915 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d vlc @%5d in %s %s:%d\n", bits2, len, r, pos, file, func, line); | ||
916 | return r; | ||
917 | } | ||
918 | static inline int get_xbits_trace(GetBitContext *s, int n, char *file, const char *func, int line){ | ||
919 | int show= show_bits(s, n); | ||
920 | int r= get_xbits(s, n); | ||
921 | |||
922 | print_bin(show, n); | ||
923 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d xbt @%5d in %s %s:%d\n", show, n, r, get_bits_count(s)-n, file, func, line); | ||
924 | return r; | ||
925 | } | ||
926 | |||
927 | #define get_bits(s, n) get_bits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__) | ||
928 | #define get_bits1(s) get_bits_trace(s, 1, __FILE__, __PRETTY_FUNCTION__, __LINE__) | ||
929 | #define get_xbits(s, n) get_xbits_trace(s, n, __FILE__, __PRETTY_FUNCTION__, __LINE__) | ||
930 | #define get_vlc(s, vlc) get_vlc_trace(s, (vlc)->table, (vlc)->bits, 3, __FILE__, __PRETTY_FUNCTION__, __LINE__) | ||
931 | #define get_vlc2(s, tab, bits, max) get_vlc_trace(s, tab, bits, max, __FILE__, __PRETTY_FUNCTION__, __LINE__) | ||
932 | |||
933 | #define tprintf(p, ...) av_log(p, AV_LOG_DEBUG, __VA_ARGS__) | ||
934 | |||
935 | #else //TRACE | ||
936 | #define tprintf(p, ...) {} | ||
937 | #endif | ||
938 | |||
939 | static inline int decode012(GetBitContext *gb){ | ||
940 | int n; | ||
941 | n = get_bits1(gb); | ||
942 | if (n == 0) | ||
943 | return 0; | ||
944 | else | ||
945 | return get_bits1(gb) + 1; | ||
946 | } | ||
947 | |||
948 | static inline int decode210(GetBitContext *gb){ | ||
949 | if (get_bits1(gb)) | ||
950 | return 0; | ||
951 | else | ||
952 | return 2 - get_bits1(gb); | ||
953 | } | ||
954 | |||
955 | #endif /* AVCODEC_BITSTREAM_H */ | ||