* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
*/
/**
- * @file cabac.h
+ * @file
* Context Adaptive Binary Arithmetic Coder.
*/
+#ifndef AVCODEC_CABAC_H
+#define AVCODEC_CABAC_H
+
+#include <stddef.h>
+
+#include "put_bits.h"
//#undef NDEBUG
#include <assert.h>
#define CABAC_BITS 16
#define CABAC_MASK ((1<<CABAC_BITS)-1)
-#define BRANCHLESS_CABAC_DECODER 1
-#define CMOV_IS_FAST 1
typedef struct CABACContext{
int low;
}CABACContext;
extern uint8_t ff_h264_mlps_state[4*64];
-extern uint8_t ff_h264_lps_range[4][2*64]; ///< rangeTabLPS
+extern uint8_t ff_h264_lps_range[4*2*64]; ///< rangeTabLPS
extern uint8_t ff_h264_mps_state[2*64]; ///< transIdxMPS
extern uint8_t ff_h264_lps_state[2*64]; ///< transIdxLPS
extern const uint8_t ff_h264_norm_shift[512];
+#if ARCH_X86
+# include "x86/cabac.h"
+#endif
void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size);
void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size);
}
}
+#ifdef TEST
static void put_cabac(CABACContext *c, uint8_t * const state, int bit){
int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + *state];
put_cabac_bypass(c, sign);
}
}
+#endif /* TEST */
static void refill(CABACContext *c){
#if CABAC_BITS == 16
c->bytestream+= CABAC_BITS/8;
}
-static void refill2(CABACContext *c){
- int i, x;
-
- x= c->low ^ (c->low-1);
- i= 7 - ff_h264_norm_shift[x>>(CABAC_BITS-1)];
-
- x= -CABAC_MASK;
-
-#if CABAC_BITS == 16
- x+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1);
-#else
- x+= c->bytestream[0]<<1;
-#endif
-
- c->low += x<<i;
- c->bytestream+= CABAC_BITS/8;
-}
-
static inline void renorm_cabac_decoder(CABACContext *c){
while(c->range < 0x100){
c->range+= c->range;
}
static inline void renorm_cabac_decoder_once(CABACContext *c){
-#ifdef ARCH_X86_DISABLED
- int temp;
-#if 0
- //P3:683 athlon:475
- asm(
- "lea -0x100(%0), %2 \n\t"
- "shr $31, %2 \n\t" //FIXME 31->63 for x86-64
- "shl %%cl, %0 \n\t"
- "shl %%cl, %1 \n\t"
- : "+r"(c->range), "+r"(c->low), "+c"(temp)
- );
-#elif 0
- //P3:680 athlon:474
- asm(
- "cmp $0x100, %0 \n\t"
- "setb %%cl \n\t" //FIXME 31->63 for x86-64
- "shl %%cl, %0 \n\t"
- "shl %%cl, %1 \n\t"
- : "+r"(c->range), "+r"(c->low), "+c"(temp)
- );
-#elif 1
- int temp2;
- //P3:665 athlon:517
- asm(
- "lea -0x100(%0), %%eax \n\t"
- "cdq \n\t"
- "mov %0, %%eax \n\t"
- "and %%edx, %0 \n\t"
- "and %1, %%edx \n\t"
- "add %%eax, %0 \n\t"
- "add %%edx, %1 \n\t"
- : "+r"(c->range), "+r"(c->low), "+a"(temp), "+d"(temp2)
- );
-#elif 0
- int temp2;
- //P3:673 athlon:509
- asm(
- "cmp $0x100, %0 \n\t"
- "sbb %%edx, %%edx \n\t"
- "mov %0, %%eax \n\t"
- "and %%edx, %0 \n\t"
- "and %1, %%edx \n\t"
- "add %%eax, %0 \n\t"
- "add %%edx, %1 \n\t"
- : "+r"(c->range), "+r"(c->low), "+a"(temp), "+d"(temp2)
- );
-#else
- int temp2;
- //P3:677 athlon:511
- asm(
- "cmp $0x100, %0 \n\t"
- "lea (%0, %0), %%eax \n\t"
- "lea (%1, %1), %%edx \n\t"
- "cmovb %%eax, %0 \n\t"
- "cmovb %%edx, %1 \n\t"
- : "+r"(c->range), "+r"(c->low), "+a"(temp), "+d"(temp2)
- );
-#endif
-#else
- //P3:675 athlon:476
int shift= (uint32_t)(c->range - 0x100)>>31;
c->range<<= shift;
c->low <<= shift;
-#endif
if(!(c->low & CABAC_MASK))
refill(c);
}
-static int always_inline get_cabac_inline(CABACContext *c, uint8_t * const state){
- //FIXME gcc generates duplicate load/stores for c->low and c->range
-#ifdef ARCH_X86
- int bit;
-
-#define LOW "0"
-#define RANGE "4"
-#define BYTESTART "12"
-#define BYTE "16"
-#define BYTEEND "20"
-#ifndef BRANCHLESS_CABAC_DECODER
- asm volatile(
- "movzbl (%1), %%eax \n\t"
- "movl "RANGE "(%2), %%ebx \n\t"
- "movl "RANGE "(%2), %%edx \n\t"
- "andl $0xC0, %%ebx \n\t"
- "movzbl "MANGLE(ff_h264_lps_range)"(%%eax, %%ebx, 2), %%esi\n\t"
- "movl "LOW "(%2), %%ebx \n\t"
-//eax:state ebx:low, edx:range, esi:RangeLPS
- "subl %%esi, %%edx \n\t"
- "movl %%edx, %%ecx \n\t"
- "shll $17, %%ecx \n\t"
- "cmpl %%ecx, %%ebx \n\t"
- " ja 1f \n\t"
+#ifndef get_cabac_inline
+static void refill2(CABACContext *c){
+ int i, x;
-#if 1
- //athlon:4067 P3:4110
- "lea -0x100(%%edx), %%ecx \n\t"
- "shr $31, %%ecx \n\t"
- "shl %%cl, %%edx \n\t"
- "shl %%cl, %%ebx \n\t"
+ x= c->low ^ (c->low-1);
+ i= 7 - ff_h264_norm_shift[x>>(CABAC_BITS-1)];
+
+ x= -CABAC_MASK;
+
+#if CABAC_BITS == 16
+ x+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1);
#else
- //athlon:4057 P3:4130
- "cmp $0x100, %%edx \n\t" //FIXME avoidable
- "setb %%cl \n\t"
- "shl %%cl, %%edx \n\t"
- "shl %%cl, %%ebx \n\t"
+ x+= c->bytestream[0]<<1;
#endif
- "movzbl "MANGLE(ff_h264_mps_state)"(%%eax), %%ecx \n\t"
- "movb %%cl, (%1) \n\t"
-//eax:state ebx:low, edx:range, esi:RangeLPS
- "test %%bx, %%bx \n\t"
- " jnz 2f \n\t"
- "movl "BYTE "(%2), %%esi \n\t"
- "subl $0xFFFF, %%ebx \n\t"
- "movzwl (%%esi), %%ecx \n\t"
- "bswap %%ecx \n\t"
- "shrl $15, %%ecx \n\t"
- "addl $2, %%esi \n\t"
- "addl %%ecx, %%ebx \n\t"
- "movl %%esi, "BYTE "(%2) \n\t"
- "jmp 2f \n\t"
- "1: \n\t"
-//eax:state ebx:low, edx:range, esi:RangeLPS
- "subl %%ecx, %%ebx \n\t"
- "movl %%esi, %%edx \n\t"
- "movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
- "shll %%cl, %%ebx \n\t"
- "shll %%cl, %%edx \n\t"
- "movzbl "MANGLE(ff_h264_lps_state)"(%%eax), %%ecx \n\t"
- "movb %%cl, (%1) \n\t"
- "addl $1, %%eax \n\t"
- "test %%bx, %%bx \n\t"
- " jnz 2f \n\t"
-
- "movl "BYTE "(%2), %%ecx \n\t"
- "movzwl (%%ecx), %%esi \n\t"
- "bswap %%esi \n\t"
- "shrl $15, %%esi \n\t"
- "subl $0xFFFF, %%esi \n\t"
- "addl $2, %%ecx \n\t"
- "movl %%ecx, "BYTE "(%2) \n\t"
-
- "leal -1(%%ebx), %%ecx \n\t"
- "xorl %%ebx, %%ecx \n\t"
- "shrl $15, %%ecx \n\t"
- "movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"
- "neg %%ecx \n\t"
- "add $7, %%ecx \n\t"
-
- "shll %%cl , %%esi \n\t"
- "addl %%esi, %%ebx \n\t"
- "2: \n\t"
- "movl %%edx, "RANGE "(%2) \n\t"
- "movl %%ebx, "LOW "(%2) \n\t"
- :"=&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
- :"r"(state), "r"(c)
- : "%ecx", "%ebx", "%edx", "%esi", "memory"
- );
- bit&=1;
-#else /* BRANCHLESS_CABAC_DECODER */
- asm volatile(
- "movzbl (%1), %%eax \n\t"
- "movl "RANGE "(%2), %%ebx \n\t"
- "movl "RANGE "(%2), %%edx \n\t"
- "andl $0xC0, %%ebx \n\t"
- "movzbl "MANGLE(ff_h264_lps_range)"(%%eax, %%ebx, 2), %%esi\n\t"
- "movl "LOW "(%2), %%ebx \n\t"
-//eax:state ebx:low, edx:range, esi:RangeLPS
- "subl %%esi, %%edx \n\t"
-#ifdef CMOV_IS_FAST
- "movl %%edx, %%ecx \n\t"
- "shl $17, %%edx \n\t"
- "cmpl %%ebx, %%edx \n\t"
- "cmova %%ecx, %%esi \n\t"
- "sbbl %%ecx, %%ecx \n\t"
- "andl %%ecx, %%edx \n\t"
- "subl %%edx, %%ebx \n\t"
- "xorl %%ecx, %%eax \n\t"
-#else /* CMOV_IS_FAST */
-FIXTHIS
- "movl %%edx, %%ecx \n\t"
- "subl %%ebx, %%edx \n\t"
- "sarl $31, %%edx \n\t" //lps_mask
- "subl %%ecx, %%esi \n\t" //RangeLPS - range
- "andl %%edx, %%esi \n\t" //(RangeLPS - range)&lps_mask
- "addl %%ecx, %%esi \n\t" //new range
- "andl %%edx, %%ecx \n\t"
- "subl %%ecx, %%ebx \n\t"
- "xorl %%edx, %%eax \n\t"
-#endif /* CMOV_IS_FAST */
-
-//eax:state ebx:low edx:mask esi:range
-
-//eax:bit ebx:low esi:range
-
- "movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
- "shll %%cl, %%esi \n\t"
- "movzbl "MANGLE(ff_h264_mlps_state)"+128(%%eax), %%edx \n\t"
- "movb %%dl, (%1) \n\t"
- "movl %%esi, "RANGE "(%2) \n\t"
- "shll %%cl, %%ebx \n\t"
- "movl %%ebx, "LOW "(%2) \n\t"
- "test %%bx, %%bx \n\t"
- " jnz 1f \n\t"
-
- "movl "BYTE "(%2), %%ecx \n\t"
- "movzwl (%%ecx), %%esi \n\t"
- "bswap %%esi \n\t"
- "shrl $15, %%esi \n\t"
- "subl $0xFFFF, %%esi \n\t"
- "addl $2, %%ecx \n\t"
- "movl %%ecx, "BYTE "(%2) \n\t"
-
- "leal -1(%%ebx), %%ecx \n\t"
- "xorl %%ebx, %%ecx \n\t"
- "shrl $15, %%ecx \n\t"
- "movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"
- "neg %%ecx \n\t"
- "add $7, %%ecx \n\t"
-
- "shll %%cl , %%esi \n\t"
- "addl %%esi, %%ebx \n\t"
- "movl %%ebx, "LOW "(%2) \n\t"
- "1: \n\t"
- :"=&a"(bit)
- :"r"(state), "r"(c)
- : "%ecx", "%ebx", "%edx", "%esi", "memory"
- );
- bit&=1;
-#endif /* BRANCHLESS_CABAC_DECODER */
-#else /* ARCH_X86 */
+
+ c->low += x<<i;
+ c->bytestream+= CABAC_BITS/8;
+}
+
+static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const state){
int s = *state;
- int RangeLPS= ff_h264_lps_range[0][2*(c->range&0xC0) + s];
- int bit, lps_mask attribute_unused;
+ int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + s];
+ int bit, lps_mask;
c->range -= RangeLPS;
-#ifndef BRANCHLESS_CABAC_DECODER
- if(c->low < (c->range<<17)){
- bit= s&1;
- *state= ff_h264_mps_state[s];
- renorm_cabac_decoder_once(c);
- }else{
- bit= ff_h264_norm_shift[RangeLPS];
- c->low -= (c->range<<17);
- *state= ff_h264_lps_state[s];
- c->range = RangeLPS<<bit;
- c->low <<= bit;
- bit= (s&1)^1;
-
- if(!(c->low & 0xFFFF)){
- refill2(c);
- }
- }
-#else /* BRANCHLESS_CABAC_DECODER */
- lps_mask= ((c->range<<17) - c->low)>>31;
+ lps_mask= ((c->range<<(CABAC_BITS+1)) - c->low)>>31;
- c->low -= (c->range<<17) & lps_mask;
+ c->low -= (c->range<<(CABAC_BITS+1)) & lps_mask;
c->range += (RangeLPS - c->range) & lps_mask;
s^=lps_mask;
c->low <<= lps_mask;
if(!(c->low & CABAC_MASK))
refill2(c);
-#endif /* BRANCHLESS_CABAC_DECODER */
-#endif /* ARCH_X86 */
return bit;
}
+#endif
-static int __attribute((noinline)) get_cabac_noinline(CABACContext *c, uint8_t * const state){
+static int av_noinline av_unused get_cabac_noinline(CABACContext *c, uint8_t * const state){
return get_cabac_inline(c,state);
}
-static int get_cabac(CABACContext *c, uint8_t * const state){
+static int av_unused get_cabac(CABACContext *c, uint8_t * const state){
return get_cabac_inline(c,state);
}
-static int get_cabac_bypass(CABACContext *c){
+static int av_unused get_cabac_bypass(CABACContext *c){
int range;
c->low += c->low;
if(!(c->low & CABAC_MASK))
refill(c);
- range= c->range<<17;
+ range= c->range<<(CABAC_BITS+1);
if(c->low < range){
return 0;
}else{
}
}
+
+#ifndef get_cabac_bypass_sign
+static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){
+ int range, mask;
+ c->low += c->low;
+
+ if(!(c->low & CABAC_MASK))
+ refill(c);
+
+ range= c->range<<(CABAC_BITS+1);
+ c->low -= range;
+ mask= c->low >> 31;
+ range &= mask;
+ c->low += range;
+ return (val^mask)-mask;
+}
+#endif
+
/**
*
* @return the number of bytes read or 0 if no end
*/
-static int get_cabac_terminate(CABACContext *c){
+static int av_unused get_cabac_terminate(CABACContext *c){
c->range -= 2;
- if(c->low < c->range<<17){
+ if(c->low < c->range<<(CABAC_BITS+1)){
renorm_cabac_decoder_once(c);
return 0;
}else{
}
}
+#if 0
/**
- * get (truncated) unnary binarization.
+ * Get (truncated) unary binarization.
*/
static int get_cabac_u(CABACContext *c, uint8_t * state, int max, int max_index, int truncated){
int i;
}else
return i;
}
+#endif /* 0 */
+
+#endif /* AVCODEC_CABAC_H */
projects / ffmpeg / blobdiff