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Diffstat (limited to 'contrib/ffmpeg/libavcodec/cabac.h')
-rw-r--r--contrib/ffmpeg/libavcodec/cabac.h859
1 files changed, 0 insertions, 859 deletions
diff --git a/contrib/ffmpeg/libavcodec/cabac.h b/contrib/ffmpeg/libavcodec/cabac.h
deleted file mode 100644
index 147d25ffa..000000000
--- a/contrib/ffmpeg/libavcodec/cabac.h
+++ /dev/null
@@ -1,859 +0,0 @@
-/*
- * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
- * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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,
- * 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
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
- */
-
-/**
- * @file cabac.h
- * Context Adaptive Binary Arithmetic Coder.
- */
-
-
-//#undef NDEBUG
-#include <assert.h>
-#ifdef ARCH_X86
-#include "x86_cpu.h"
-#endif
-
-#define CABAC_BITS 16
-#define CABAC_MASK ((1<<CABAC_BITS)-1)
-#define BRANCHLESS_CABAC_DECODER 1
-//#define ARCH_X86_DISABLED 1
-
-typedef struct CABACContext{
- int low;
- int range;
- int outstanding_count;
-#ifdef STRICT_LIMITS
- int symCount;
-#endif
- const uint8_t *bytestream_start;
- const uint8_t *bytestream;
- const uint8_t *bytestream_end;
- PutBitContext pb;
-}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_mps_state[2*64]; ///< transIdxMPS
-extern uint8_t ff_h264_lps_state[2*64]; ///< transIdxLPS
-extern const uint8_t ff_h264_norm_shift[512];
-
-
-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);
-void ff_init_cabac_states(CABACContext *c);
-
-
-static inline void put_cabac_bit(CABACContext *c, int b){
- put_bits(&c->pb, 1, b);
- for(;c->outstanding_count; c->outstanding_count--){
- put_bits(&c->pb, 1, 1-b);
- }
-}
-
-static inline void renorm_cabac_encoder(CABACContext *c){
- while(c->range < 0x100){
- //FIXME optimize
- if(c->low<0x100){
- put_cabac_bit(c, 0);
- }else if(c->low<0x200){
- c->outstanding_count++;
- c->low -= 0x100;
- }else{
- put_cabac_bit(c, 1);
- c->low -= 0x200;
- }
-
- c->range+= c->range;
- c->low += c->low;
- }
-}
-
-static void put_cabac(CABACContext *c, uint8_t * const state, int bit){
- int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + *state];
-
- if(bit == ((*state)&1)){
- c->range -= RangeLPS;
- *state= ff_h264_mps_state[*state];
- }else{
- c->low += c->range - RangeLPS;
- c->range = RangeLPS;
- *state= ff_h264_lps_state[*state];
- }
-
- renorm_cabac_encoder(c);
-
-#ifdef STRICT_LIMITS
- c->symCount++;
-#endif
-}
-
-static void put_cabac_static(CABACContext *c, int RangeLPS, int bit){
- assert(c->range > RangeLPS);
-
- if(!bit){
- c->range -= RangeLPS;
- }else{
- c->low += c->range - RangeLPS;
- c->range = RangeLPS;
- }
-
- renorm_cabac_encoder(c);
-
-#ifdef STRICT_LIMITS
- c->symCount++;
-#endif
-}
-
-/**
- * @param bit 0 -> write zero bit, !=0 write one bit
- */
-static void put_cabac_bypass(CABACContext *c, int bit){
- c->low += c->low;
-
- if(bit){
- c->low += c->range;
- }
-//FIXME optimize
- if(c->low<0x200){
- put_cabac_bit(c, 0);
- }else if(c->low<0x400){
- c->outstanding_count++;
- c->low -= 0x200;
- }else{
- put_cabac_bit(c, 1);
- c->low -= 0x400;
- }
-
-#ifdef STRICT_LIMITS
- c->symCount++;
-#endif
-}
-
-/**
- *
- * @return the number of bytes written
- */
-static int put_cabac_terminate(CABACContext *c, int bit){
- c->range -= 2;
-
- if(!bit){
- renorm_cabac_encoder(c);
- }else{
- c->low += c->range;
- c->range= 2;
-
- renorm_cabac_encoder(c);
-
- assert(c->low <= 0x1FF);
- put_cabac_bit(c, c->low>>9);
- put_bits(&c->pb, 2, ((c->low>>7)&3)|1);
-
- flush_put_bits(&c->pb); //FIXME FIXME FIXME XXX wrong
- }
-
-#ifdef STRICT_LIMITS
- c->symCount++;
-#endif
-
- return (put_bits_count(&c->pb)+7)>>3;
-}
-
-/**
- * put (truncated) unary binarization.
- */
-static void put_cabac_u(CABACContext *c, uint8_t * state, int v, int max, int max_index, int truncated){
- int i;
-
- assert(v <= max);
-
-#if 1
- for(i=0; i<v; i++){
- put_cabac(c, state, 1);
- if(i < max_index) state++;
- }
- if(truncated==0 || v<max)
- put_cabac(c, state, 0);
-#else
- if(v <= max_index){
- for(i=0; i<v; i++){
- put_cabac(c, state+i, 1);
- }
- if(truncated==0 || v<max)
- put_cabac(c, state+i, 0);
- }else{
- for(i=0; i<=max_index; i++){
- put_cabac(c, state+i, 1);
- }
- for(; i<v; i++){
- put_cabac(c, state+max_index, 1);
- }
- if(truncated==0 || v<max)
- put_cabac(c, state+max_index, 0);
- }
-#endif
-}
-
-/**
- * put unary exp golomb k-th order binarization.
- */
-static void put_cabac_ueg(CABACContext *c, uint8_t * state, int v, int max, int is_signed, int k, int max_index){
- int i;
-
- if(v==0)
- put_cabac(c, state, 0);
- else{
- const int sign= v < 0;
-
- if(is_signed) v= FFABS(v);
-
- if(v<max){
- for(i=0; i<v; i++){
- put_cabac(c, state, 1);
- if(i < max_index) state++;
- }
-
- put_cabac(c, state, 0);
- }else{
- int m= 1<<k;
-
- for(i=0; i<max; i++){
- put_cabac(c, state, 1);
- if(i < max_index) state++;
- }
-
- v -= max;
- while(v >= m){ //FIXME optimize
- put_cabac_bypass(c, 1);
- v-= m;
- m+= m;
- }
- put_cabac_bypass(c, 0);
- while(m>>=1){
- put_cabac_bypass(c, v&m);
- }
- }
-
- if(is_signed)
- put_cabac_bypass(c, sign);
- }
-}
-
-static void refill(CABACContext *c){
-#if CABAC_BITS == 16
- c->low+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1);
-#else
- c->low+= c->bytestream[0]<<1;
-#endif
- c->low -= CABAC_MASK;
- 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;
- c->low+= c->low;
- if(!(c->low & CABAC_MASK))
- refill(c);
- }
-}
-
-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 av_always_inline get_cabac_inline(CABACContext *c, uint8_t * const state){
- //FIXME gcc generates duplicate load/stores for c->low and c->range
-#define LOW "0"
-#define RANGE "4"
-#ifdef ARCH_X86_64
-#define BYTESTART "16"
-#define BYTE "24"
-#define BYTEEND "32"
-#else
-#define BYTESTART "12"
-#define BYTE "16"
-#define BYTEEND "20"
-#endif
-#if defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(CONFIG_EBX_AVAILABLE) && !( defined(ARCH_X86_64) && defined(PIC) )
- int bit;
-
-#ifndef BRANCHLESS_CABAC_DECODER
- asm volatile(
- "movzbl (%1), %0 \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)"(%0, %%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"
-
-#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"
-#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"
-#endif
- "movzbl "MANGLE(ff_h264_mps_state)"(%0), %%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"
- "mov "BYTE "(%2), %%"REG_S" \n\t"
- "subl $0xFFFF, %%ebx \n\t"
- "movzwl (%%"REG_S"), %%ecx \n\t"
- "bswap %%ecx \n\t"
- "shrl $15, %%ecx \n\t"
- "add $2, %%"REG_S" \n\t"
- "addl %%ecx, %%ebx \n\t"
- "mov %%"REG_S", "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)"(%0), %%ecx \n\t"
- "movb %%cl, (%1) \n\t"
- "add $1, %0 \n\t"
- "test %%bx, %%bx \n\t"
- " jnz 2f \n\t"
-
- "mov "BYTE "(%2), %%"REG_c" \n\t"
- "movzwl (%%"REG_c"), %%esi \n\t"
- "bswap %%esi \n\t"
- "shrl $15, %%esi \n\t"
- "subl $0xFFFF, %%esi \n\t"
- "add $2, %%"REG_c" \n\t"
- "mov %%"REG_c", "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)
- : "%"REG_c, "%ebx", "%edx", "%"REG_S, "memory"
- );
- bit&=1;
-#else /* BRANCHLESS_CABAC_DECODER */
-
-
-#if defined HAVE_FAST_CMOV
-#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
- "mov "tmp" , %%ecx \n\t"\
- "shl $17 , "tmp" \n\t"\
- "cmp "low" , "tmp" \n\t"\
- "cmova %%ecx , "range" \n\t"\
- "sbb %%ecx , %%ecx \n\t"\
- "and %%ecx , "tmp" \n\t"\
- "sub "tmp" , "low" \n\t"\
- "xor %%ecx , "ret" \n\t"
-#else /* HAVE_FAST_CMOV */
-#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
- "mov "tmp" , %%ecx \n\t"\
- "shl $17 , "tmp" \n\t"\
- "sub "low" , "tmp" \n\t"\
- "sar $31 , "tmp" \n\t" /*lps_mask*/\
- "sub %%ecx , "range" \n\t" /*RangeLPS - range*/\
- "and "tmp" , "range" \n\t" /*(RangeLPS - range)&lps_mask*/\
- "add %%ecx , "range" \n\t" /*new range*/\
- "shl $17 , %%ecx \n\t"\
- "and "tmp" , %%ecx \n\t"\
- "sub %%ecx , "low" \n\t"\
- "xor "tmp" , "ret" \n\t"
-#endif /* HAVE_FAST_CMOV */
-
-
-#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
- "movzbl "statep" , "ret" \n\t"\
- "mov "range" , "tmp" \n\t"\
- "and $0xC0 , "range" \n\t"\
- "movzbl "MANGLE(ff_h264_lps_range)"("ret", "range", 2), "range" \n\t"\
- "sub "range" , "tmp" \n\t"\
- BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
- "movzbl " MANGLE(ff_h264_norm_shift) "("range"), %%ecx \n\t"\
- "shl %%cl , "range" \n\t"\
- "movzbl "MANGLE(ff_h264_mlps_state)"+128("ret"), "tmp" \n\t"\
- "mov "tmpbyte" , "statep" \n\t"\
- "shl %%cl , "low" \n\t"\
- "test "lowword" , "lowword" \n\t"\
- " jnz 1f \n\t"\
- "mov "BYTE"("cabac"), %%"REG_c" \n\t"\
- "movzwl (%%"REG_c") , "tmp" \n\t"\
- "bswap "tmp" \n\t"\
- "shr $15 , "tmp" \n\t"\
- "sub $0xFFFF , "tmp" \n\t"\
- "add $2 , %%"REG_c" \n\t"\
- "mov %%"REG_c" , "BYTE "("cabac") \n\t"\
- "lea -1("low") , %%ecx \n\t"\
- "xor "low" , %%ecx \n\t"\
- "shr $15 , %%ecx \n\t"\
- "movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\
- "neg %%ecx \n\t"\
- "add $7 , %%ecx \n\t"\
- "shl %%cl , "tmp" \n\t"\
- "add "tmp" , "low" \n\t"\
- "1: \n\t"
-
- asm volatile(
- "movl "RANGE "(%2), %%esi \n\t"
- "movl "LOW "(%2), %%ebx \n\t"
- BRANCHLESS_GET_CABAC("%0", "%2", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
- "movl %%esi, "RANGE "(%2) \n\t"
- "movl %%ebx, "LOW "(%2) \n\t"
-
- :"=&a"(bit)
- :"r"(state), "r"(c)
- : "%"REG_c, "%ebx", "%edx", "%esi", "memory"
- );
- bit&=1;
-#endif /* BRANCHLESS_CABAC_DECODER */
-#else /* defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__)) */
- int s = *state;
- int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + s];
- int bit, lps_mask attribute_unused;
-
- c->range -= RangeLPS;
-#ifndef BRANCHLESS_CABAC_DECODER
- if(c->low < (c->range<<(CABAC_BITS+1))){
- 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<<(CABAC_BITS+1));
- *state= ff_h264_lps_state[s];
- c->range = RangeLPS<<bit;
- c->low <<= bit;
- bit= (s&1)^1;
-
- if(!(c->low & CABAC_MASK)){
- refill2(c);
- }
- }
-#else /* BRANCHLESS_CABAC_DECODER */
- lps_mask= ((c->range<<(CABAC_BITS+1)) - c->low)>>31;
-
- c->low -= (c->range<<(CABAC_BITS+1)) & lps_mask;
- c->range += (RangeLPS - c->range) & lps_mask;
-
- s^=lps_mask;
- *state= (ff_h264_mlps_state+128)[s];
- bit= s&1;
-
- lps_mask= ff_h264_norm_shift[c->range];
- c->range<<= lps_mask;
- c->low <<= lps_mask;
- if(!(c->low & CABAC_MASK))
- refill2(c);
-#endif /* BRANCHLESS_CABAC_DECODER */
-#endif /* defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__)) */
- return bit;
-}
-
-static int av_noinline 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){
- return get_cabac_inline(c,state);
-}
-
-static int get_cabac_bypass(CABACContext *c){
-#if 0 //not faster
- int bit;
- asm volatile(
- "movl "RANGE "(%1), %%ebx \n\t"
- "movl "LOW "(%1), %%eax \n\t"
- "shl $17, %%ebx \n\t"
- "add %%eax, %%eax \n\t"
- "sub %%ebx, %%eax \n\t"
- "cdq \n\t"
- "and %%edx, %%ebx \n\t"
- "add %%ebx, %%eax \n\t"
- "test %%ax, %%ax \n\t"
- " jnz 1f \n\t"
- "movl "BYTE "(%1), %%"REG_b" \n\t"
- "subl $0xFFFF, %%eax \n\t"
- "movzwl (%%"REG_b"), %%ecx \n\t"
- "bswap %%ecx \n\t"
- "shrl $15, %%ecx \n\t"
- "addl $2, %%"REG_b" \n\t"
- "addl %%ecx, %%eax \n\t"
- "movl %%"REG_b", "BYTE "(%1) \n\t"
- "1: \n\t"
- "movl %%eax, "LOW "(%1) \n\t"
-
- :"=&d"(bit)
- :"r"(c)
- : "%eax", "%"REG_b, "%ecx", "memory"
- );
- return bit+1;
-#else
- int range;
- c->low += c->low;
-
- if(!(c->low & CABAC_MASK))
- refill(c);
-
- range= c->range<<(CABAC_BITS+1);
- if(c->low < range){
- return 0;
- }else{
- c->low -= range;
- return 1;
- }
-#endif
-}
-
-
-static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){
-#if defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__))
- asm volatile(
- "movl "RANGE "(%1), %%ebx \n\t"
- "movl "LOW "(%1), %%eax \n\t"
- "shl $17, %%ebx \n\t"
- "add %%eax, %%eax \n\t"
- "sub %%ebx, %%eax \n\t"
- "cdq \n\t"
- "and %%edx, %%ebx \n\t"
- "add %%ebx, %%eax \n\t"
- "xor %%edx, %%ecx \n\t"
- "sub %%edx, %%ecx \n\t"
- "test %%ax, %%ax \n\t"
- " jnz 1f \n\t"
- "mov "BYTE "(%1), %%"REG_b" \n\t"
- "subl $0xFFFF, %%eax \n\t"
- "movzwl (%%"REG_b"), %%edx \n\t"
- "bswap %%edx \n\t"
- "shrl $15, %%edx \n\t"
- "add $2, %%"REG_b" \n\t"
- "addl %%edx, %%eax \n\t"
- "mov %%"REG_b", "BYTE "(%1) \n\t"
- "1: \n\t"
- "movl %%eax, "LOW "(%1) \n\t"
-
- :"+c"(val)
- :"r"(c)
- : "%eax", "%"REG_b, "%edx", "memory"
- );
- return val;
-#else
- 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
-}
-
-//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!)
-//FIXME use some macros to avoid duplicatin get_cabac (cant be done yet as that would make optimization work hard)
-#if defined(ARCH_X86) && defined(CONFIG_7REGS) && defined(CONFIG_EBX_AVAILABLE) && !( defined(ARCH_X86_64) && defined(PIC) )
-static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *significant_coeff_ctx_base, int *index){
- void *end= significant_coeff_ctx_base + max_coeff - 1;
- int minusstart= -(int)significant_coeff_ctx_base;
- int minusindex= 4-(int)index;
- int coeff_count;
- asm volatile(
- "movl "RANGE "(%3), %%esi \n\t"
- "movl "LOW "(%3), %%ebx \n\t"
-
- "2: \n\t"
-
- BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al")
-
- "test $1, %%edx \n\t"
- " jz 3f \n\t"
-
- BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al")
-
- "mov %2, %%"REG_a" \n\t"
- "movl %4, %%ecx \n\t"
- "add %1, %%"REG_c" \n\t"
- "movl %%ecx, (%%"REG_a") \n\t"
-
- "test $1, %%edx \n\t"
- " jnz 4f \n\t"
-
- "add $4, %%"REG_a" \n\t"
- "mov %%"REG_a", %2 \n\t"
-
- "3: \n\t"
- "add $1, %1 \n\t"
- "cmp %5, %1 \n\t"
- " jb 2b \n\t"
- "mov %2, %%"REG_a" \n\t"
- "movl %4, %%ecx \n\t"
- "add %1, %%"REG_c" \n\t"
- "movl %%ecx, (%%"REG_a") \n\t"
- "4: \n\t"
- "add %6, %%eax \n\t"
- "shr $2, %%eax \n\t"
-
- "movl %%esi, "RANGE "(%3) \n\t"
- "movl %%ebx, "LOW "(%3) \n\t"
- :"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)\
- :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex)\
- : "%"REG_c, "%ebx", "%edx", "%esi", "memory"\
- );
- return coeff_count;
-}
-
-static int decode_significance_8x8_x86(CABACContext *c, uint8_t *significant_coeff_ctx_base, int *index, uint8_t *sig_off){
- int minusindex= 4-(int)index;
- int coeff_count;
- long last=0;
- asm volatile(
- "movl "RANGE "(%3), %%esi \n\t"
- "movl "LOW "(%3), %%ebx \n\t"
-
- "mov %1, %%"REG_D" \n\t"
- "2: \n\t"
-
- "mov %6, %%"REG_a" \n\t"
- "movzbl (%%"REG_a", %%"REG_D"), %%edi \n\t"
- "add %5, %%"REG_D" \n\t"
-
- BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al")
-
- "mov %1, %%edi \n\t"
- "test $1, %%edx \n\t"
- " jz 3f \n\t"
-
- "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
- "add %5, %%"REG_D" \n\t"
-
- BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al")
-
- "mov %2, %%"REG_a" \n\t"
- "mov %1, %%edi \n\t"
- "movl %%edi, (%%"REG_a") \n\t"
-
- "test $1, %%edx \n\t"
- " jnz 4f \n\t"
-
- "add $4, %%"REG_a" \n\t"
- "mov %%"REG_a", %2 \n\t"
-
- "3: \n\t"
- "addl $1, %%edi \n\t"
- "mov %%edi, %1 \n\t"
- "cmpl $63, %%edi \n\t"
- " jb 2b \n\t"
- "mov %2, %%"REG_a" \n\t"
- "movl %%edi, (%%"REG_a") \n\t"
- "4: \n\t"
- "addl %4, %%eax \n\t"
- "shr $2, %%eax \n\t"
-
- "movl %%esi, "RANGE "(%3) \n\t"
- "movl %%ebx, "LOW "(%3) \n\t"
- :"=&a"(coeff_count),"+m"(last), "+m"(index)\
- :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off)\
- : "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"\
- );
- return coeff_count;
-}
-#endif /* defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__)) */
-
-/**
- *
- * @return the number of bytes read or 0 if no end
- */
-static int get_cabac_terminate(CABACContext *c){
- c->range -= 2;
- if(c->low < c->range<<(CABAC_BITS+1)){
- renorm_cabac_decoder_once(c);
- return 0;
- }else{
- return c->bytestream - c->bytestream_start;
- }
-}
-
-/**
- * get (truncated) unnary binarization.
- */
-static int get_cabac_u(CABACContext *c, uint8_t * state, int max, int max_index, int truncated){
- int i;
-
- for(i=0; i<max; i++){
- if(get_cabac(c, state)==0)
- return i;
-
- if(i< max_index) state++;
- }
-
- return truncated ? max : -1;
-}
-
-/**
- * get unary exp golomb k-th order binarization.
- */
-static int get_cabac_ueg(CABACContext *c, uint8_t * state, int max, int is_signed, int k, int max_index){
- int i, v;
- int m= 1<<k;
-
- if(get_cabac(c, state)==0)
- return 0;
-
- if(0 < max_index) state++;
-
- for(i=1; i<max; i++){
- if(get_cabac(c, state)==0){
- if(is_signed && get_cabac_bypass(c)){
- return -i;
- }else
- return i;
- }
-
- if(i < max_index) state++;
- }
-
- while(get_cabac_bypass(c)){
- i+= m;
- m+= m;
- }
-
- v=0;
- while(m>>=1){
- v+= v + get_cabac_bypass(c);
- }
- i += v;
-
- if(is_signed && get_cabac_bypass(c)){
- return -i;
- }else
- return i;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 11:23:04 +0000