ffmpeg / libavcodec / cabac.h @ 849f1035
History | View | Annotate | Download (28.3 KB)
| 1 |
/*
|
|---|---|
| 2 |
* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
|
| 3 |
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
|
| 4 |
*
|
| 5 |
* This file is part of FFmpeg.
|
| 6 |
*
|
| 7 |
* FFmpeg is free software; you can redistribute it and/or
|
| 8 |
* modify it under the terms of the GNU Lesser General Public
|
| 9 |
* License as published by the Free Software Foundation; either
|
| 10 |
* version 2.1 of the License, or (at your option) any later version.
|
| 11 |
*
|
| 12 |
* FFmpeg is distributed in the hope that it will be useful,
|
| 13 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
| 14 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
| 15 |
* Lesser General Public License for more details.
|
| 16 |
*
|
| 17 |
* You should have received a copy of the GNU Lesser General Public
|
| 18 |
* License along with FFmpeg; if not, write to the Free Software
|
| 19 |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
| 20 |
*
|
| 21 |
*/
|
| 22 |
|
| 23 |
/**
|
| 24 |
* @file cabac.h
|
| 25 |
* Context Adaptive Binary Arithmetic Coder.
|
| 26 |
*/
|
| 27 |
|
| 28 |
|
| 29 |
//#undef NDEBUG
|
| 30 |
#include <assert.h> |
| 31 |
#ifdef ARCH_X86
|
| 32 |
#include "x86_cpu.h" |
| 33 |
#endif
|
| 34 |
|
| 35 |
#define CABAC_BITS 16 |
| 36 |
#define CABAC_MASK ((1<<CABAC_BITS)-1) |
| 37 |
#define BRANCHLESS_CABAC_DECODER 1 |
| 38 |
//#define ARCH_X86_DISABLED 1
|
| 39 |
|
| 40 |
typedef struct CABACContext{ |
| 41 |
int low;
|
| 42 |
int range;
|
| 43 |
int outstanding_count;
|
| 44 |
#ifdef STRICT_LIMITS
|
| 45 |
int symCount;
|
| 46 |
#endif
|
| 47 |
const uint8_t *bytestream_start;
|
| 48 |
const uint8_t *bytestream;
|
| 49 |
const uint8_t *bytestream_end;
|
| 50 |
PutBitContext pb; |
| 51 |
}CABACContext; |
| 52 |
|
| 53 |
extern uint8_t ff_h264_mlps_state[4*64]; |
| 54 |
extern uint8_t ff_h264_lps_range[4*2*64]; ///< rangeTabLPS |
| 55 |
extern uint8_t ff_h264_mps_state[2*64]; ///< transIdxMPS |
| 56 |
extern uint8_t ff_h264_lps_state[2*64]; ///< transIdxLPS |
| 57 |
extern const uint8_t ff_h264_norm_shift[512]; |
| 58 |
|
| 59 |
|
| 60 |
void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size); |
| 61 |
void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size); |
| 62 |
void ff_init_cabac_states(CABACContext *c);
|
| 63 |
|
| 64 |
|
| 65 |
static inline void put_cabac_bit(CABACContext *c, int b){ |
| 66 |
put_bits(&c->pb, 1, b);
|
| 67 |
for(;c->outstanding_count; c->outstanding_count--){
|
| 68 |
put_bits(&c->pb, 1, 1-b); |
| 69 |
} |
| 70 |
} |
| 71 |
|
| 72 |
static inline void renorm_cabac_encoder(CABACContext *c){ |
| 73 |
while(c->range < 0x100){ |
| 74 |
//FIXME optimize
|
| 75 |
if(c->low<0x100){ |
| 76 |
put_cabac_bit(c, 0);
|
| 77 |
}else if(c->low<0x200){ |
| 78 |
c->outstanding_count++; |
| 79 |
c->low -= 0x100;
|
| 80 |
}else{
|
| 81 |
put_cabac_bit(c, 1);
|
| 82 |
c->low -= 0x200;
|
| 83 |
} |
| 84 |
|
| 85 |
c->range+= c->range; |
| 86 |
c->low += c->low; |
| 87 |
} |
| 88 |
} |
| 89 |
|
| 90 |
static void put_cabac(CABACContext *c, uint8_t * const state, int bit){ |
| 91 |
int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + *state]; |
| 92 |
|
| 93 |
if(bit == ((*state)&1)){ |
| 94 |
c->range -= RangeLPS; |
| 95 |
*state= ff_h264_mps_state[*state]; |
| 96 |
}else{
|
| 97 |
c->low += c->range - RangeLPS; |
| 98 |
c->range = RangeLPS; |
| 99 |
*state= ff_h264_lps_state[*state]; |
| 100 |
} |
| 101 |
|
| 102 |
renorm_cabac_encoder(c); |
| 103 |
|
| 104 |
#ifdef STRICT_LIMITS
|
| 105 |
c->symCount++; |
| 106 |
#endif
|
| 107 |
} |
| 108 |
|
| 109 |
static void put_cabac_static(CABACContext *c, int RangeLPS, int bit){ |
| 110 |
assert(c->range > RangeLPS); |
| 111 |
|
| 112 |
if(!bit){
|
| 113 |
c->range -= RangeLPS; |
| 114 |
}else{
|
| 115 |
c->low += c->range - RangeLPS; |
| 116 |
c->range = RangeLPS; |
| 117 |
} |
| 118 |
|
| 119 |
renorm_cabac_encoder(c); |
| 120 |
|
| 121 |
#ifdef STRICT_LIMITS
|
| 122 |
c->symCount++; |
| 123 |
#endif
|
| 124 |
} |
| 125 |
|
| 126 |
/**
|
| 127 |
* @param bit 0 -> write zero bit, !=0 write one bit
|
| 128 |
*/
|
| 129 |
static void put_cabac_bypass(CABACContext *c, int bit){ |
| 130 |
c->low += c->low; |
| 131 |
|
| 132 |
if(bit){
|
| 133 |
c->low += c->range; |
| 134 |
} |
| 135 |
//FIXME optimize
|
| 136 |
if(c->low<0x200){ |
| 137 |
put_cabac_bit(c, 0);
|
| 138 |
}else if(c->low<0x400){ |
| 139 |
c->outstanding_count++; |
| 140 |
c->low -= 0x200;
|
| 141 |
}else{
|
| 142 |
put_cabac_bit(c, 1);
|
| 143 |
c->low -= 0x400;
|
| 144 |
} |
| 145 |
|
| 146 |
#ifdef STRICT_LIMITS
|
| 147 |
c->symCount++; |
| 148 |
#endif
|
| 149 |
} |
| 150 |
|
| 151 |
/**
|
| 152 |
*
|
| 153 |
* @return the number of bytes written
|
| 154 |
*/
|
| 155 |
static int put_cabac_terminate(CABACContext *c, int bit){ |
| 156 |
c->range -= 2;
|
| 157 |
|
| 158 |
if(!bit){
|
| 159 |
renorm_cabac_encoder(c); |
| 160 |
}else{
|
| 161 |
c->low += c->range; |
| 162 |
c->range= 2;
|
| 163 |
|
| 164 |
renorm_cabac_encoder(c); |
| 165 |
|
| 166 |
assert(c->low <= 0x1FF);
|
| 167 |
put_cabac_bit(c, c->low>>9);
|
| 168 |
put_bits(&c->pb, 2, ((c->low>>7)&3)|1); |
| 169 |
|
| 170 |
flush_put_bits(&c->pb); //FIXME FIXME FIXME XXX wrong
|
| 171 |
} |
| 172 |
|
| 173 |
#ifdef STRICT_LIMITS
|
| 174 |
c->symCount++; |
| 175 |
#endif
|
| 176 |
|
| 177 |
return (put_bits_count(&c->pb)+7)>>3; |
| 178 |
} |
| 179 |
|
| 180 |
/**
|
| 181 |
* put (truncated) unary binarization.
|
| 182 |
*/
|
| 183 |
static void put_cabac_u(CABACContext *c, uint8_t * state, int v, int max, int max_index, int truncated){ |
| 184 |
int i;
|
| 185 |
|
| 186 |
assert(v <= max); |
| 187 |
|
| 188 |
#if 1 |
| 189 |
for(i=0; i<v; i++){ |
| 190 |
put_cabac(c, state, 1);
|
| 191 |
if(i < max_index) state++;
|
| 192 |
} |
| 193 |
if(truncated==0 || v<max) |
| 194 |
put_cabac(c, state, 0);
|
| 195 |
#else
|
| 196 |
if(v <= max_index){
|
| 197 |
for(i=0; i<v; i++){ |
| 198 |
put_cabac(c, state+i, 1);
|
| 199 |
} |
| 200 |
if(truncated==0 || v<max) |
| 201 |
put_cabac(c, state+i, 0);
|
| 202 |
}else{
|
| 203 |
for(i=0; i<=max_index; i++){ |
| 204 |
put_cabac(c, state+i, 1);
|
| 205 |
} |
| 206 |
for(; i<v; i++){
|
| 207 |
put_cabac(c, state+max_index, 1);
|
| 208 |
} |
| 209 |
if(truncated==0 || v<max) |
| 210 |
put_cabac(c, state+max_index, 0);
|
| 211 |
} |
| 212 |
#endif
|
| 213 |
} |
| 214 |
|
| 215 |
/**
|
| 216 |
* put unary exp golomb k-th order binarization.
|
| 217 |
*/
|
| 218 |
static void put_cabac_ueg(CABACContext *c, uint8_t * state, int v, int max, int is_signed, int k, int max_index){ |
| 219 |
int i;
|
| 220 |
|
| 221 |
if(v==0) |
| 222 |
put_cabac(c, state, 0);
|
| 223 |
else{
|
| 224 |
const int sign= v < 0; |
| 225 |
|
| 226 |
if(is_signed) v= FFABS(v);
|
| 227 |
|
| 228 |
if(v<max){
|
| 229 |
for(i=0; i<v; i++){ |
| 230 |
put_cabac(c, state, 1);
|
| 231 |
if(i < max_index) state++;
|
| 232 |
} |
| 233 |
|
| 234 |
put_cabac(c, state, 0);
|
| 235 |
}else{
|
| 236 |
int m= 1<<k; |
| 237 |
|
| 238 |
for(i=0; i<max; i++){ |
| 239 |
put_cabac(c, state, 1);
|
| 240 |
if(i < max_index) state++;
|
| 241 |
} |
| 242 |
|
| 243 |
v -= max; |
| 244 |
while(v >= m){ //FIXME optimize |
| 245 |
put_cabac_bypass(c, 1);
|
| 246 |
v-= m; |
| 247 |
m+= m; |
| 248 |
} |
| 249 |
put_cabac_bypass(c, 0);
|
| 250 |
while(m>>=1){ |
| 251 |
put_cabac_bypass(c, v&m); |
| 252 |
} |
| 253 |
} |
| 254 |
|
| 255 |
if(is_signed)
|
| 256 |
put_cabac_bypass(c, sign); |
| 257 |
} |
| 258 |
} |
| 259 |
|
| 260 |
static void refill(CABACContext *c){ |
| 261 |
#if CABAC_BITS == 16 |
| 262 |
c->low+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1); |
| 263 |
#else
|
| 264 |
c->low+= c->bytestream[0]<<1; |
| 265 |
#endif
|
| 266 |
c->low -= CABAC_MASK; |
| 267 |
c->bytestream+= CABAC_BITS/8;
|
| 268 |
} |
| 269 |
|
| 270 |
static void refill2(CABACContext *c){ |
| 271 |
int i, x;
|
| 272 |
|
| 273 |
x= c->low ^ (c->low-1);
|
| 274 |
i= 7 - ff_h264_norm_shift[x>>(CABAC_BITS-1)]; |
| 275 |
|
| 276 |
x= -CABAC_MASK; |
| 277 |
|
| 278 |
#if CABAC_BITS == 16 |
| 279 |
x+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1); |
| 280 |
#else
|
| 281 |
x+= c->bytestream[0]<<1; |
| 282 |
#endif
|
| 283 |
|
| 284 |
c->low += x<<i; |
| 285 |
c->bytestream+= CABAC_BITS/8;
|
| 286 |
} |
| 287 |
|
| 288 |
static inline void renorm_cabac_decoder(CABACContext *c){ |
| 289 |
while(c->range < 0x100){ |
| 290 |
c->range+= c->range; |
| 291 |
c->low+= c->low; |
| 292 |
if(!(c->low & CABAC_MASK))
|
| 293 |
refill(c); |
| 294 |
} |
| 295 |
} |
| 296 |
|
| 297 |
static inline void renorm_cabac_decoder_once(CABACContext *c){ |
| 298 |
#ifdef ARCH_X86_DISABLED
|
| 299 |
int temp;
|
| 300 |
#if 0
|
| 301 |
//P3:683 athlon:475
|
| 302 |
asm(
|
| 303 |
"lea -0x100(%0), %2 \n\t"
|
| 304 |
"shr $31, %2 \n\t" //FIXME 31->63 for x86-64
|
| 305 |
"shl %%cl, %0 \n\t"
|
| 306 |
"shl %%cl, %1 \n\t"
|
| 307 |
: "+r"(c->range), "+r"(c->low), "+c"(temp)
|
| 308 |
);
|
| 309 |
#elif 0
|
| 310 |
//P3:680 athlon:474
|
| 311 |
asm(
|
| 312 |
"cmp $0x100, %0 \n\t"
|
| 313 |
"setb %%cl \n\t" //FIXME 31->63 for x86-64 |
| 314 |
"shl %%cl, %0 \n\t"
|
| 315 |
"shl %%cl, %1 \n\t"
|
| 316 |
: "+r"(c->range), "+r"(c->low), "+c"(temp) |
| 317 |
); |
| 318 |
#elif 1 |
| 319 |
int temp2;
|
| 320 |
//P3:665 athlon:517
|
| 321 |
asm(
|
| 322 |
"lea -0x100(%0), %%eax \n\t"
|
| 323 |
"cdq \n\t"
|
| 324 |
"mov %0, %%eax \n\t"
|
| 325 |
"and %%edx, %0 \n\t"
|
| 326 |
"and %1, %%edx \n\t"
|
| 327 |
"add %%eax, %0 \n\t"
|
| 328 |
"add %%edx, %1 \n\t"
|
| 329 |
: "+r"(c->range), "+r"(c->low), "+a"(temp), "+d"(temp2) |
| 330 |
); |
| 331 |
#elif 0 |
| 332 |
int temp2;
|
| 333 |
//P3:673 athlon:509
|
| 334 |
asm(
|
| 335 |
"cmp $0x100, %0 \n\t"
|
| 336 |
"sbb %%edx, %%edx \n\t"
|
| 337 |
"mov %0, %%eax \n\t"
|
| 338 |
"and %%edx, %0 \n\t"
|
| 339 |
"and %1, %%edx \n\t"
|
| 340 |
"add %%eax, %0 \n\t"
|
| 341 |
"add %%edx, %1 \n\t"
|
| 342 |
: "+r"(c->range), "+r"(c->low), "+a"(temp), "+d"(temp2) |
| 343 |
); |
| 344 |
#else
|
| 345 |
int temp2;
|
| 346 |
//P3:677 athlon:511
|
| 347 |
asm(
|
| 348 |
"cmp $0x100, %0 \n\t"
|
| 349 |
"lea (%0, %0), %%eax \n\t"
|
| 350 |
"lea (%1, %1), %%edx \n\t"
|
| 351 |
"cmovb %%eax, %0 \n\t"
|
| 352 |
"cmovb %%edx, %1 \n\t"
|
| 353 |
: "+r"(c->range), "+r"(c->low), "+a"(temp), "+d"(temp2) |
| 354 |
); |
| 355 |
#endif
|
| 356 |
#else
|
| 357 |
//P3:675 athlon:476
|
| 358 |
int shift= (uint32_t)(c->range - 0x100)>>31; |
| 359 |
c->range<<= shift; |
| 360 |
c->low <<= shift; |
| 361 |
#endif
|
| 362 |
if(!(c->low & CABAC_MASK))
|
| 363 |
refill(c); |
| 364 |
} |
| 365 |
|
| 366 |
static int av_always_inline get_cabac_inline(CABACContext *c, uint8_t * const state){ |
| 367 |
//FIXME gcc generates duplicate load/stores for c->low and c->range
|
| 368 |
#define LOW "0" |
| 369 |
#define RANGE "4" |
| 370 |
#ifdef ARCH_X86_64
|
| 371 |
#define BYTESTART "16" |
| 372 |
#define BYTE "24" |
| 373 |
#define BYTEEND "32" |
| 374 |
#else
|
| 375 |
#define BYTESTART "12" |
| 376 |
#define BYTE "16" |
| 377 |
#define BYTEEND "20" |
| 378 |
#endif
|
| 379 |
#if defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__))
|
| 380 |
int bit;
|
| 381 |
|
| 382 |
#ifndef BRANCHLESS_CABAC_DECODER
|
| 383 |
asm volatile( |
| 384 |
"movzbl (%1), %0 \n\t"
|
| 385 |
"movl "RANGE "(%2), %%ebx \n\t" |
| 386 |
"movl "RANGE "(%2), %%edx \n\t" |
| 387 |
"andl $0xC0, %%ebx \n\t"
|
| 388 |
"movzbl "MANGLE(ff_h264_lps_range)"(%0, %%ebx, 2), %%esi\n\t" |
| 389 |
"movl "LOW "(%2), %%ebx \n\t" |
| 390 |
//eax:state ebx:low, edx:range, esi:RangeLPS
|
| 391 |
"subl %%esi, %%edx \n\t"
|
| 392 |
"movl %%edx, %%ecx \n\t"
|
| 393 |
"shll $17, %%ecx \n\t"
|
| 394 |
"cmpl %%ecx, %%ebx \n\t"
|
| 395 |
" ja 1f \n\t"
|
| 396 |
|
| 397 |
#if 1 |
| 398 |
//athlon:4067 P3:4110
|
| 399 |
"lea -0x100(%%edx), %%ecx \n\t"
|
| 400 |
"shr $31, %%ecx \n\t"
|
| 401 |
"shl %%cl, %%edx \n\t"
|
| 402 |
"shl %%cl, %%ebx \n\t"
|
| 403 |
#else
|
| 404 |
//athlon:4057 P3:4130
|
| 405 |
"cmp $0x100, %%edx \n\t" //FIXME avoidable |
| 406 |
"setb %%cl \n\t"
|
| 407 |
"shl %%cl, %%edx \n\t"
|
| 408 |
"shl %%cl, %%ebx \n\t"
|
| 409 |
#endif
|
| 410 |
"movzbl "MANGLE(ff_h264_mps_state)"(%0), %%ecx \n\t" |
| 411 |
"movb %%cl, (%1) \n\t"
|
| 412 |
//eax:state ebx:low, edx:range, esi:RangeLPS
|
| 413 |
"test %%bx, %%bx \n\t"
|
| 414 |
" jnz 2f \n\t"
|
| 415 |
"mov "BYTE "(%2), %%"REG_S" \n\t" |
| 416 |
"subl $0xFFFF, %%ebx \n\t"
|
| 417 |
"movzwl (%%"REG_S"), %%ecx \n\t" |
| 418 |
"bswap %%ecx \n\t"
|
| 419 |
"shrl $15, %%ecx \n\t"
|
| 420 |
"add $2, %%"REG_S" \n\t" |
| 421 |
"addl %%ecx, %%ebx \n\t"
|
| 422 |
"mov %%"REG_S", "BYTE "(%2) \n\t" |
| 423 |
"jmp 2f \n\t"
|
| 424 |
"1: \n\t"
|
| 425 |
//eax:state ebx:low, edx:range, esi:RangeLPS
|
| 426 |
"subl %%ecx, %%ebx \n\t"
|
| 427 |
"movl %%esi, %%edx \n\t"
|
| 428 |
"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t" |
| 429 |
"shll %%cl, %%ebx \n\t"
|
| 430 |
"shll %%cl, %%edx \n\t"
|
| 431 |
"movzbl "MANGLE(ff_h264_lps_state)"(%0), %%ecx \n\t" |
| 432 |
"movb %%cl, (%1) \n\t"
|
| 433 |
"add $1, %0 \n\t"
|
| 434 |
"test %%bx, %%bx \n\t"
|
| 435 |
" jnz 2f \n\t"
|
| 436 |
|
| 437 |
"mov "BYTE "(%2), %%"REG_c" \n\t" |
| 438 |
"movzwl (%%"REG_c"), %%esi \n\t" |
| 439 |
"bswap %%esi \n\t"
|
| 440 |
"shrl $15, %%esi \n\t"
|
| 441 |
"subl $0xFFFF, %%esi \n\t"
|
| 442 |
"add $2, %%"REG_c" \n\t" |
| 443 |
"mov %%"REG_c", "BYTE "(%2) \n\t" |
| 444 |
|
| 445 |
"leal -1(%%ebx), %%ecx \n\t"
|
| 446 |
"xorl %%ebx, %%ecx \n\t"
|
| 447 |
"shrl $15, %%ecx \n\t"
|
| 448 |
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t" |
| 449 |
"neg %%ecx \n\t"
|
| 450 |
"add $7, %%ecx \n\t"
|
| 451 |
|
| 452 |
"shll %%cl , %%esi \n\t"
|
| 453 |
"addl %%esi, %%ebx \n\t"
|
| 454 |
"2: \n\t"
|
| 455 |
"movl %%edx, "RANGE "(%2) \n\t" |
| 456 |
"movl %%ebx, "LOW "(%2) \n\t" |
| 457 |
:"=&a"(bit) //FIXME this is fragile gcc either runs out of registers or misscompiles it (for example if "+a"(bit) or "+m"(*state) is used |
| 458 |
:"r"(state), "r"(c) |
| 459 |
: "%"REG_c, "%ebx", "%edx", "%"REG_S, "memory" |
| 460 |
); |
| 461 |
bit&=1;
|
| 462 |
#else /* BRANCHLESS_CABAC_DECODER */ |
| 463 |
|
| 464 |
|
| 465 |
#if defined CMOV_IS_FAST
|
| 466 |
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
|
| 467 |
"mov "tmp" , %%ecx \n\t"\ |
| 468 |
"shl $17 , "tmp" \n\t"\ |
| 469 |
"cmp "low" , "tmp" \n\t"\ |
| 470 |
"cmova %%ecx , "range" \n\t"\ |
| 471 |
"sbb %%ecx , %%ecx \n\t"\
|
| 472 |
"and %%ecx , "tmp" \n\t"\ |
| 473 |
"sub "tmp" , "low" \n\t"\ |
| 474 |
"xor %%ecx , "ret" \n\t" |
| 475 |
#else /* CMOV_IS_FAST */ |
| 476 |
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
|
| 477 |
"mov "tmp" , %%ecx \n\t"\ |
| 478 |
"shl $17 , "tmp" \n\t"\ |
| 479 |
"sub "low" , "tmp" \n\t"\ |
| 480 |
"sar $31 , "tmp" \n\t" /*lps_mask*/\ |
| 481 |
"sub %%ecx , "range" \n\t" /*RangeLPS - range*/\ |
| 482 |
"and "tmp" , "range" \n\t" /*(RangeLPS - range)&lps_mask*/\ |
| 483 |
"add %%ecx , "range" \n\t" /*new range*/\ |
| 484 |
"shl $17 , %%ecx \n\t"\
|
| 485 |
"and "tmp" , %%ecx \n\t"\ |
| 486 |
"sub %%ecx , "low" \n\t"\ |
| 487 |
"xor "tmp" , "ret" \n\t" |
| 488 |
#endif /* CMOV_IS_FAST */ |
| 489 |
|
| 490 |
|
| 491 |
#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
|
| 492 |
"movzbl "statep" , "ret" \n\t"\ |
| 493 |
"mov "range" , "tmp" \n\t"\ |
| 494 |
"and $0xC0 , "range" \n\t"\ |
| 495 |
"movzbl "MANGLE(ff_h264_lps_range)"("ret", "range", 2), "range" \n\t"\ |
| 496 |
"sub "range" , "tmp" \n\t"\ |
| 497 |
BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\ |
| 498 |
"movzbl " MANGLE(ff_h264_norm_shift) "("range"), %%ecx \n\t"\ |
| 499 |
"shl %%cl , "range" \n\t"\ |
| 500 |
"movzbl "MANGLE(ff_h264_mlps_state)"+128("ret"), "tmp" \n\t"\ |
| 501 |
"mov "tmpbyte" , "statep" \n\t"\ |
| 502 |
"shl %%cl , "low" \n\t"\ |
| 503 |
"test "lowword" , "lowword" \n\t"\ |
| 504 |
" jnz 1f \n\t"\
|
| 505 |
"mov "BYTE"("cabac"), %%"REG_c" \n\t"\ |
| 506 |
"movzwl (%%"REG_c") , "tmp" \n\t"\ |
| 507 |
"bswap "tmp" \n\t"\ |
| 508 |
"shr $15 , "tmp" \n\t"\ |
| 509 |
"sub $0xFFFF , "tmp" \n\t"\ |
| 510 |
"add $2 , %%"REG_c" \n\t"\ |
| 511 |
"mov %%"REG_c" , "BYTE "("cabac") \n\t"\ |
| 512 |
"lea -1("low") , %%ecx \n\t"\ |
| 513 |
"xor "low" , %%ecx \n\t"\ |
| 514 |
"shr $15 , %%ecx \n\t"\
|
| 515 |
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\ |
| 516 |
"neg %%ecx \n\t"\
|
| 517 |
"add $7 , %%ecx \n\t"\
|
| 518 |
"shl %%cl , "tmp" \n\t"\ |
| 519 |
"add "tmp" , "low" \n\t"\ |
| 520 |
"1: \n\t"
|
| 521 |
|
| 522 |
asm volatile( |
| 523 |
"movl "RANGE "(%2), %%esi \n\t" |
| 524 |
"movl "LOW "(%2), %%ebx \n\t" |
| 525 |
BRANCHLESS_GET_CABAC("%0", "%2", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl") |
| 526 |
"movl %%esi, "RANGE "(%2) \n\t" |
| 527 |
"movl %%ebx, "LOW "(%2) \n\t" |
| 528 |
|
| 529 |
:"=&a"(bit)
|
| 530 |
:"r"(state), "r"(c) |
| 531 |
: "%"REG_c, "%ebx", "%edx", "%esi", "memory" |
| 532 |
); |
| 533 |
bit&=1;
|
| 534 |
#endif /* BRANCHLESS_CABAC_DECODER */ |
| 535 |
#else /* defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__)) */ |
| 536 |
int s = *state;
|
| 537 |
int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + s]; |
| 538 |
int bit, lps_mask attribute_unused;
|
| 539 |
|
| 540 |
c->range -= RangeLPS; |
| 541 |
#ifndef BRANCHLESS_CABAC_DECODER
|
| 542 |
if(c->low < (c->range<<17)){ |
| 543 |
bit= s&1;
|
| 544 |
*state= ff_h264_mps_state[s]; |
| 545 |
renorm_cabac_decoder_once(c); |
| 546 |
}else{
|
| 547 |
bit= ff_h264_norm_shift[RangeLPS]; |
| 548 |
c->low -= (c->range<<17);
|
| 549 |
*state= ff_h264_lps_state[s]; |
| 550 |
c->range = RangeLPS<<bit; |
| 551 |
c->low <<= bit; |
| 552 |
bit= (s&1)^1; |
| 553 |
|
| 554 |
if(!(c->low & 0xFFFF)){ |
| 555 |
refill2(c); |
| 556 |
} |
| 557 |
} |
| 558 |
#else /* BRANCHLESS_CABAC_DECODER */ |
| 559 |
lps_mask= ((c->range<<17) - c->low)>>31; |
| 560 |
|
| 561 |
c->low -= (c->range<<17) & lps_mask;
|
| 562 |
c->range += (RangeLPS - c->range) & lps_mask; |
| 563 |
|
| 564 |
s^=lps_mask; |
| 565 |
*state= (ff_h264_mlps_state+128)[s];
|
| 566 |
bit= s&1;
|
| 567 |
|
| 568 |
lps_mask= ff_h264_norm_shift[c->range]; |
| 569 |
c->range<<= lps_mask; |
| 570 |
c->low <<= lps_mask; |
| 571 |
if(!(c->low & CABAC_MASK))
|
| 572 |
refill2(c); |
| 573 |
#endif /* BRANCHLESS_CABAC_DECODER */ |
| 574 |
#endif /* defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__)) */ |
| 575 |
return bit;
|
| 576 |
} |
| 577 |
|
| 578 |
static int __attribute((noinline)) get_cabac_noinline(CABACContext *c, uint8_t * const state){ |
| 579 |
return get_cabac_inline(c,state);
|
| 580 |
} |
| 581 |
|
| 582 |
static int get_cabac(CABACContext *c, uint8_t * const state){ |
| 583 |
return get_cabac_inline(c,state);
|
| 584 |
} |
| 585 |
|
| 586 |
static int get_cabac_bypass(CABACContext *c){ |
| 587 |
#if 0 //not faster
|
| 588 |
int bit;
|
| 589 |
asm volatile(
|
| 590 |
"movl "RANGE "(%1), %%ebx \n\t"
|
| 591 |
"movl "LOW "(%1), %%eax \n\t"
|
| 592 |
"shl $17, %%ebx \n\t"
|
| 593 |
"add %%eax, %%eax \n\t"
|
| 594 |
"sub %%ebx, %%eax \n\t"
|
| 595 |
"cdq \n\t"
|
| 596 |
"and %%edx, %%ebx \n\t"
|
| 597 |
"add %%ebx, %%eax \n\t"
|
| 598 |
"test %%ax, %%ax \n\t"
|
| 599 |
" jnz 1f \n\t"
|
| 600 |
"movl "BYTE "(%1), %%"REG_b" \n\t"
|
| 601 |
"subl $0xFFFF, %%eax \n\t"
|
| 602 |
"movzwl (%%"REG_b"), %%ecx \n\t"
|
| 603 |
"bswap %%ecx \n\t"
|
| 604 |
"shrl $15, %%ecx \n\t"
|
| 605 |
"addl $2, %%"REG_b" \n\t"
|
| 606 |
"addl %%ecx, %%eax \n\t"
|
| 607 |
"movl %%"REG_b", "BYTE "(%1) \n\t"
|
| 608 |
"1: \n\t"
|
| 609 |
"movl %%eax, "LOW "(%1) \n\t"
|
| 610 |
|
| 611 |
:"=&d"(bit)
|
| 612 |
:"r"(c)
|
| 613 |
: "%eax", "%"REG_b, "%ecx", "memory"
|
| 614 |
);
|
| 615 |
return bit+1;
|
| 616 |
#else
|
| 617 |
int range;
|
| 618 |
c->low += c->low; |
| 619 |
|
| 620 |
if(!(c->low & CABAC_MASK))
|
| 621 |
refill(c); |
| 622 |
|
| 623 |
range= c->range<<17;
|
| 624 |
if(c->low < range){
|
| 625 |
return 0; |
| 626 |
}else{
|
| 627 |
c->low -= range; |
| 628 |
return 1; |
| 629 |
} |
| 630 |
#endif
|
| 631 |
} |
| 632 |
|
| 633 |
|
| 634 |
static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){ |
| 635 |
#if defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__))
|
| 636 |
asm volatile( |
| 637 |
"movl "RANGE "(%1), %%ebx \n\t" |
| 638 |
"movl "LOW "(%1), %%eax \n\t" |
| 639 |
"shl $17, %%ebx \n\t"
|
| 640 |
"add %%eax, %%eax \n\t"
|
| 641 |
"sub %%ebx, %%eax \n\t"
|
| 642 |
"cdq \n\t"
|
| 643 |
"and %%edx, %%ebx \n\t"
|
| 644 |
"add %%ebx, %%eax \n\t"
|
| 645 |
"xor %%edx, %%ecx \n\t"
|
| 646 |
"sub %%edx, %%ecx \n\t"
|
| 647 |
"test %%ax, %%ax \n\t"
|
| 648 |
" jnz 1f \n\t"
|
| 649 |
"mov "BYTE "(%1), %%"REG_b" \n\t" |
| 650 |
"subl $0xFFFF, %%eax \n\t"
|
| 651 |
"movzwl (%%"REG_b"), %%edx \n\t" |
| 652 |
"bswap %%edx \n\t"
|
| 653 |
"shrl $15, %%edx \n\t"
|
| 654 |
"add $2, %%"REG_b" \n\t" |
| 655 |
"addl %%edx, %%eax \n\t"
|
| 656 |
"mov %%"REG_b", "BYTE "(%1) \n\t" |
| 657 |
"1: \n\t"
|
| 658 |
"movl %%eax, "LOW "(%1) \n\t" |
| 659 |
|
| 660 |
:"+c"(val)
|
| 661 |
:"r"(c)
|
| 662 |
: "%eax", "%"REG_b, "%edx", "memory" |
| 663 |
); |
| 664 |
return val;
|
| 665 |
#else
|
| 666 |
int range, mask;
|
| 667 |
c->low += c->low; |
| 668 |
|
| 669 |
if(!(c->low & CABAC_MASK))
|
| 670 |
refill(c); |
| 671 |
|
| 672 |
range= c->range<<17;
|
| 673 |
c->low -= range; |
| 674 |
mask= c->low >> 31;
|
| 675 |
range &= mask; |
| 676 |
c->low += range; |
| 677 |
return (val^mask)-mask;
|
| 678 |
#endif
|
| 679 |
} |
| 680 |
|
| 681 |
//FIXME the x86 code from this file should be moved into i386/h264 or cabac something.c/h (note ill kill you if you move my code away from under my fingers before iam finished with it!)
|
| 682 |
//FIXME use some macros to avoid duplicatin get_cabac (cant be done yet as that would make optimization work hard)
|
| 683 |
#if defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__))
|
| 684 |
static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *significant_coeff_ctx_base, int *index){ |
| 685 |
void *end= significant_coeff_ctx_base + max_coeff - 1; |
| 686 |
int minusstart= -(int)significant_coeff_ctx_base; |
| 687 |
int minusindex= 4-(int)index; |
| 688 |
int coeff_count;
|
| 689 |
asm volatile( |
| 690 |
"movl "RANGE "(%3), %%esi \n\t" |
| 691 |
"movl "LOW "(%3), %%ebx \n\t" |
| 692 |
|
| 693 |
"2: \n\t"
|
| 694 |
|
| 695 |
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al") |
| 696 |
|
| 697 |
"test $1, %%edx \n\t"
|
| 698 |
" jz 3f \n\t"
|
| 699 |
|
| 700 |
BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al") |
| 701 |
|
| 702 |
"mov %2, %%"REG_a" \n\t" |
| 703 |
"movl %4, %%ecx \n\t"
|
| 704 |
"add %1, %%"REG_c" \n\t" |
| 705 |
"movl %%ecx, (%%"REG_a") \n\t" |
| 706 |
|
| 707 |
"test $1, %%edx \n\t"
|
| 708 |
" jnz 4f \n\t"
|
| 709 |
|
| 710 |
"add $4, %%"REG_a" \n\t" |
| 711 |
"mov %%"REG_a", %2 \n\t" |
| 712 |
|
| 713 |
"3: \n\t"
|
| 714 |
"add $1, %1 \n\t"
|
| 715 |
"cmp %5, %1 \n\t"
|
| 716 |
" jb 2b \n\t"
|
| 717 |
"mov %2, %%"REG_a" \n\t" |
| 718 |
"movl %4, %%ecx \n\t"
|
| 719 |
"add %1, %%"REG_c" \n\t" |
| 720 |
"movl %%ecx, (%%"REG_a") \n\t" |
| 721 |
"4: \n\t"
|
| 722 |
"add %6, %%eax \n\t"
|
| 723 |
"shr $2, %%eax \n\t"
|
| 724 |
|
| 725 |
"movl %%esi, "RANGE "(%3) \n\t" |
| 726 |
"movl %%ebx, "LOW "(%3) \n\t" |
| 727 |
:"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)\ |
| 728 |
:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex)\ |
| 729 |
: "%"REG_c, "%ebx", "%edx", "%esi", "memory"\ |
| 730 |
); |
| 731 |
return coeff_count;
|
| 732 |
} |
| 733 |
|
| 734 |
static int decode_significance_8x8_x86(CABACContext *c, uint8_t *significant_coeff_ctx_base, int *index, uint8_t *sig_off){ |
| 735 |
int minusindex= 4-(int)index; |
| 736 |
int coeff_count;
|
| 737 |
long last=0; |
| 738 |
asm volatile( |
| 739 |
"movl "RANGE "(%3), %%esi \n\t" |
| 740 |
"movl "LOW "(%3), %%ebx \n\t" |
| 741 |
|
| 742 |
"mov %1, %%"REG_D" \n\t" |
| 743 |
"2: \n\t"
|
| 744 |
|
| 745 |
"mov %6, %%"REG_a" \n\t" |
| 746 |
"movzbl (%%"REG_a", %%"REG_D"), %%edi \n\t" |
| 747 |
"add %5, %%"REG_D" \n\t" |
| 748 |
|
| 749 |
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al") |
| 750 |
|
| 751 |
"mov %1, %%edi \n\t"
|
| 752 |
"test $1, %%edx \n\t"
|
| 753 |
" jz 3f \n\t"
|
| 754 |
|
| 755 |
"movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t" |
| 756 |
"add %5, %%"REG_D" \n\t" |
| 757 |
|
| 758 |
BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al") |
| 759 |
|
| 760 |
"mov %2, %%"REG_a" \n\t" |
| 761 |
"mov %1, %%edi \n\t"
|
| 762 |
"movl %%edi, (%%"REG_a") \n\t" |
| 763 |
|
| 764 |
"test $1, %%edx \n\t"
|
| 765 |
" jnz 4f \n\t"
|
| 766 |
|
| 767 |
"add $4, %%"REG_a" \n\t" |
| 768 |
"mov %%"REG_a", %2 \n\t" |
| 769 |
|
| 770 |
"3: \n\t"
|
| 771 |
"addl $1, %%edi \n\t"
|
| 772 |
"mov %%edi, %1 \n\t"
|
| 773 |
"cmpl $63, %%edi \n\t"
|
| 774 |
" jb 2b \n\t"
|
| 775 |
"mov %2, %%"REG_a" \n\t" |
| 776 |
"movl %%edi, (%%"REG_a") \n\t" |
| 777 |
"4: \n\t"
|
| 778 |
"addl %4, %%eax \n\t"
|
| 779 |
"shr $2, %%eax \n\t"
|
| 780 |
|
| 781 |
"movl %%esi, "RANGE "(%3) \n\t" |
| 782 |
"movl %%ebx, "LOW "(%3) \n\t" |
| 783 |
:"=&a"(coeff_count),"+m"(last), "+m"(index)\ |
| 784 |
:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off)\ |
| 785 |
: "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"\ |
| 786 |
); |
| 787 |
return coeff_count;
|
| 788 |
} |
| 789 |
#endif /* defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__)) */ |
| 790 |
|
| 791 |
/**
|
| 792 |
*
|
| 793 |
* @return the number of bytes read or 0 if no end
|
| 794 |
*/
|
| 795 |
static int get_cabac_terminate(CABACContext *c){ |
| 796 |
c->range -= 2;
|
| 797 |
if(c->low < c->range<<17){ |
| 798 |
renorm_cabac_decoder_once(c); |
| 799 |
return 0; |
| 800 |
}else{
|
| 801 |
return c->bytestream - c->bytestream_start;
|
| 802 |
} |
| 803 |
} |
| 804 |
|
| 805 |
/**
|
| 806 |
* get (truncated) unnary binarization.
|
| 807 |
*/
|
| 808 |
static int get_cabac_u(CABACContext *c, uint8_t * state, int max, int max_index, int truncated){ |
| 809 |
int i;
|
| 810 |
|
| 811 |
for(i=0; i<max; i++){ |
| 812 |
if(get_cabac(c, state)==0) |
| 813 |
return i;
|
| 814 |
|
| 815 |
if(i< max_index) state++;
|
| 816 |
} |
| 817 |
|
| 818 |
return truncated ? max : -1; |
| 819 |
} |
| 820 |
|
| 821 |
/**
|
| 822 |
* get unary exp golomb k-th order binarization.
|
| 823 |
*/
|
| 824 |
static int get_cabac_ueg(CABACContext *c, uint8_t * state, int max, int is_signed, int k, int max_index){ |
| 825 |
int i, v;
|
| 826 |
int m= 1<<k; |
| 827 |
|
| 828 |
if(get_cabac(c, state)==0) |
| 829 |
return 0; |
| 830 |
|
| 831 |
if(0 < max_index) state++; |
| 832 |
|
| 833 |
for(i=1; i<max; i++){ |
| 834 |
if(get_cabac(c, state)==0){ |
| 835 |
if(is_signed && get_cabac_bypass(c)){
|
| 836 |
return -i;
|
| 837 |
}else
|
| 838 |
return i;
|
| 839 |
} |
| 840 |
|
| 841 |
if(i < max_index) state++;
|
| 842 |
} |
| 843 |
|
| 844 |
while(get_cabac_bypass(c)){
|
| 845 |
i+= m; |
| 846 |
m+= m; |
| 847 |
} |
| 848 |
|
| 849 |
v=0;
|
| 850 |
while(m>>=1){ |
| 851 |
v+= v + get_cabac_bypass(c); |
| 852 |
} |
| 853 |
i += v; |
| 854 |
|
| 855 |
if(is_signed && get_cabac_bypass(c)){
|
| 856 |
return -i;
|
| 857 |
}else
|
| 858 |
return i;
|
| 859 |
} |