ffmpeg / libavcodec / cabac.h @ 5b21bdab
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/*
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* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file cabac.h
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* Context Adaptive Binary Arithmetic Coder.
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*/
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#ifndef FFMPEG_CABAC_H
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#define FFMPEG_CABAC_H
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#include "bitstream.h" |
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//#undef NDEBUG
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#include <assert.h> |
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#ifdef ARCH_X86
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#include "x86_cpu.h" |
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#endif
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#define CABAC_BITS 16 |
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#define CABAC_MASK ((1<<CABAC_BITS)-1) |
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#define BRANCHLESS_CABAC_DECODER 1 |
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//#define ARCH_X86_DISABLED 1
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typedef struct CABACContext{ |
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int low;
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int range;
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int outstanding_count;
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#ifdef STRICT_LIMITS
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int symCount;
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#endif
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const uint8_t *bytestream_start;
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const uint8_t *bytestream;
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const uint8_t *bytestream_end;
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PutBitContext pb; |
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}CABACContext; |
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extern uint8_t ff_h264_mlps_state[4*64]; |
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extern uint8_t ff_h264_lps_range[4*2*64]; ///< rangeTabLPS |
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extern uint8_t ff_h264_mps_state[2*64]; ///< transIdxMPS |
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extern uint8_t ff_h264_lps_state[2*64]; ///< transIdxLPS |
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extern const uint8_t ff_h264_norm_shift[512]; |
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void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size); |
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void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size); |
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void ff_init_cabac_states(CABACContext *c);
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static inline void put_cabac_bit(CABACContext *c, int b){ |
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put_bits(&c->pb, 1, b);
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for(;c->outstanding_count; c->outstanding_count--){
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put_bits(&c->pb, 1, 1-b); |
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} |
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} |
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static inline void renorm_cabac_encoder(CABACContext *c){ |
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while(c->range < 0x100){ |
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//FIXME optimize
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if(c->low<0x100){ |
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put_cabac_bit(c, 0);
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}else if(c->low<0x200){ |
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c->outstanding_count++; |
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c->low -= 0x100;
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}else{
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put_cabac_bit(c, 1);
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c->low -= 0x200;
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} |
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c->range+= c->range; |
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c->low += c->low; |
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} |
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} |
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#if 0
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static void put_cabac(CABACContext *c, uint8_t * const state, int bit){
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int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + *state];
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if(bit == ((*state)&1)){
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c->range -= RangeLPS;
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*state= ff_h264_mps_state[*state];
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}else{
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c->low += c->range - RangeLPS;
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c->range = RangeLPS;
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*state= ff_h264_lps_state[*state];
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}
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renorm_cabac_encoder(c);
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#ifdef STRICT_LIMITS
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c->symCount++;
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#endif
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} |
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static void put_cabac_static(CABACContext *c, int RangeLPS, int bit){ |
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assert(c->range > RangeLPS); |
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if(!bit){
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c->range -= RangeLPS; |
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}else{
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c->low += c->range - RangeLPS; |
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c->range = RangeLPS; |
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} |
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renorm_cabac_encoder(c); |
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#ifdef STRICT_LIMITS
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c->symCount++; |
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#endif
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} |
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/**
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* @param bit 0 -> write zero bit, !=0 write one bit
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*/
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static void put_cabac_bypass(CABACContext *c, int bit){ |
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c->low += c->low; |
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if(bit){
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c->low += c->range; |
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} |
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//FIXME optimize
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if(c->low<0x200){ |
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put_cabac_bit(c, 0);
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}else if(c->low<0x400){ |
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c->outstanding_count++; |
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c->low -= 0x200;
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}else{
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put_cabac_bit(c, 1);
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c->low -= 0x400;
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} |
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#ifdef STRICT_LIMITS
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c->symCount++; |
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#endif
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} |
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/**
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*
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* @return the number of bytes written
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*/
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static int put_cabac_terminate(CABACContext *c, int bit){ |
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c->range -= 2;
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if(!bit){
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renorm_cabac_encoder(c); |
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}else{
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c->low += c->range; |
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c->range= 2;
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renorm_cabac_encoder(c); |
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assert(c->low <= 0x1FF);
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put_cabac_bit(c, c->low>>9);
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put_bits(&c->pb, 2, ((c->low>>7)&3)|1); |
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flush_put_bits(&c->pb); //FIXME FIXME FIXME XXX wrong
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} |
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#ifdef STRICT_LIMITS
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c->symCount++; |
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#endif
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return (put_bits_count(&c->pb)+7)>>3; |
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} |
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/**
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* put (truncated) unary binarization.
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*/
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static void put_cabac_u(CABACContext *c, uint8_t * state, int v, int max, int max_index, int truncated){ |
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int i;
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assert(v <= max); |
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#if 1 |
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for(i=0; i<v; i++){ |
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put_cabac(c, state, 1);
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if(i < max_index) state++;
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} |
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if(truncated==0 || v<max) |
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put_cabac(c, state, 0);
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#else
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if(v <= max_index){
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for(i=0; i<v; i++){ |
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put_cabac(c, state+i, 1);
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} |
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if(truncated==0 || v<max) |
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put_cabac(c, state+i, 0);
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}else{
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for(i=0; i<=max_index; i++){ |
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put_cabac(c, state+i, 1);
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} |
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for(; i<v; i++){
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put_cabac(c, state+max_index, 1);
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} |
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if(truncated==0 || v<max) |
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put_cabac(c, state+max_index, 0);
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} |
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#endif
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} |
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/**
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* put unary exp golomb k-th order binarization.
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*/
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static void put_cabac_ueg(CABACContext *c, uint8_t * state, int v, int max, int is_signed, int k, int max_index){ |
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int i;
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if(v==0) |
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put_cabac(c, state, 0);
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else{
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const int sign= v < 0; |
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if(is_signed) v= FFABS(v);
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if(v<max){
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for(i=0; i<v; i++){ |
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put_cabac(c, state, 1);
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if(i < max_index) state++;
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} |
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put_cabac(c, state, 0);
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}else{
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int m= 1<<k; |
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for(i=0; i<max; i++){ |
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put_cabac(c, state, 1);
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if(i < max_index) state++;
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} |
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v -= max; |
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while(v >= m){ //FIXME optimize |
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put_cabac_bypass(c, 1);
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v-= m; |
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m+= m; |
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} |
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put_cabac_bypass(c, 0);
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while(m>>=1){ |
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put_cabac_bypass(c, v&m); |
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} |
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} |
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if(is_signed)
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put_cabac_bypass(c, sign); |
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} |
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} |
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#endif /* 0 */ |
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static void refill(CABACContext *c){ |
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#if CABAC_BITS == 16 |
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c->low+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1); |
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#else
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c->low+= c->bytestream[0]<<1; |
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#endif
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c->low -= CABAC_MASK; |
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c->bytestream+= CABAC_BITS/8;
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} |
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#if ! ( defined(ARCH_X86) && defined(HAVE_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS) )
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static void refill2(CABACContext *c){ |
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int i, x;
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x= c->low ^ (c->low-1);
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i= 7 - ff_h264_norm_shift[x>>(CABAC_BITS-1)]; |
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x= -CABAC_MASK; |
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#if CABAC_BITS == 16 |
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x+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1); |
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#else
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x+= c->bytestream[0]<<1; |
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#endif
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c->low += x<<i; |
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c->bytestream+= CABAC_BITS/8;
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} |
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#endif
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static inline void renorm_cabac_decoder(CABACContext *c){ |
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while(c->range < 0x100){ |
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c->range+= c->range; |
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c->low+= c->low; |
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if(!(c->low & CABAC_MASK))
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refill(c); |
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} |
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} |
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static inline void renorm_cabac_decoder_once(CABACContext *c){ |
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#ifdef ARCH_X86_DISABLED
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int temp;
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#if 0
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//P3:683 athlon:475
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asm(
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"lea -0x100(%0), %2 \n\t"
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"shr $31, %2 \n\t" //FIXME 31->63 for x86-64
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"shl %%cl, %0 \n\t"
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"shl %%cl, %1 \n\t"
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: "+r"(c->range), "+r"(c->low), "+c"(temp)
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);
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#elif 0
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//P3:680 athlon:474
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asm(
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"cmp $0x100, %0 \n\t"
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"setb %%cl \n\t" //FIXME 31->63 for x86-64 |
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"shl %%cl, %0 \n\t"
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"shl %%cl, %1 \n\t"
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: "+r"(c->range), "+r"(c->low), "+c"(temp) |
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); |
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#elif 1 |
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int temp2;
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//P3:665 athlon:517
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asm(
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"lea -0x100(%0), %%eax \n\t"
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"cdq \n\t"
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"mov %0, %%eax \n\t"
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"and %%edx, %0 \n\t"
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"and %1, %%edx \n\t"
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"add %%eax, %0 \n\t"
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"add %%edx, %1 \n\t"
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: "+r"(c->range), "+r"(c->low), "+a"(temp), "+d"(temp2) |
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); |
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#elif 0 |
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int temp2;
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//P3:673 athlon:509
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asm(
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"cmp $0x100, %0 \n\t"
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"sbb %%edx, %%edx \n\t"
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"mov %0, %%eax \n\t"
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"and %%edx, %0 \n\t"
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"and %1, %%edx \n\t"
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"add %%eax, %0 \n\t"
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"add %%edx, %1 \n\t"
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: "+r"(c->range), "+r"(c->low), "+a"(temp), "+d"(temp2) |
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); |
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#else
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int temp2;
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//P3:677 athlon:511
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asm(
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"cmp $0x100, %0 \n\t"
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"lea (%0, %0), %%eax \n\t"
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"lea (%1, %1), %%edx \n\t"
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"cmovb %%eax, %0 \n\t"
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"cmovb %%edx, %1 \n\t"
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: "+r"(c->range), "+r"(c->low), "+a"(temp), "+d"(temp2) |
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); |
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#endif
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#else
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//P3:675 athlon:476
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int shift= (uint32_t)(c->range - 0x100)>>31; |
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c->range<<= shift; |
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c->low <<= shift; |
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#endif
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if(!(c->low & CABAC_MASK))
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refill(c); |
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} |
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static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const state){ |
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//FIXME gcc generates duplicate load/stores for c->low and c->range
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#define LOW "0" |
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#define RANGE "4" |
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#ifdef ARCH_X86_64
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#define BYTESTART "16" |
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#define BYTE "24" |
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#define BYTEEND "32" |
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#else
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#define BYTESTART "12" |
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#define BYTE "16" |
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#define BYTEEND "20" |
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#endif
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#if defined(ARCH_X86) && defined(HAVE_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS)
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int bit;
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#ifndef BRANCHLESS_CABAC_DECODER
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asm volatile( |
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"movzbl (%1), %0 \n\t"
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"movl "RANGE "(%2), %%ebx \n\t" |
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"movl "RANGE "(%2), %%edx \n\t" |
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"andl $0xC0, %%ebx \n\t"
|
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"movzbl "MANGLE(ff_h264_lps_range)"(%0, %%ebx, 2), %%esi\n\t" |
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"movl "LOW "(%2), %%ebx \n\t" |
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//eax:state ebx:low, edx:range, esi:RangeLPS
|
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"subl %%esi, %%edx \n\t"
|
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"movl %%edx, %%ecx \n\t"
|
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"shll $17, %%ecx \n\t"
|
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"cmpl %%ecx, %%ebx \n\t"
|
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" ja 1f \n\t"
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|
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#if 1 |
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//athlon:4067 P3:4110
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"lea -0x100(%%edx), %%ecx \n\t"
|
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"shr $31, %%ecx \n\t"
|
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"shl %%cl, %%edx \n\t"
|
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"shl %%cl, %%ebx \n\t"
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#else
|
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//athlon:4057 P3:4130
|
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"cmp $0x100, %%edx \n\t" //FIXME avoidable |
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"setb %%cl \n\t"
|
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"shl %%cl, %%edx \n\t"
|
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"shl %%cl, %%ebx \n\t"
|
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#endif
|
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"movzbl "MANGLE(ff_h264_mps_state)"(%0), %%ecx \n\t" |
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"movb %%cl, (%1) \n\t"
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//eax:state ebx:low, edx:range, esi:RangeLPS
|
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"test %%bx, %%bx \n\t"
|
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" jnz 2f \n\t"
|
| 422 |
"mov "BYTE "(%2), %%"REG_S" \n\t" |
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"subl $0xFFFF, %%ebx \n\t"
|
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"movzwl (%%"REG_S"), %%ecx \n\t" |
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"bswap %%ecx \n\t"
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"shrl $15, %%ecx \n\t"
|
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"add $2, %%"REG_S" \n\t" |
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"addl %%ecx, %%ebx \n\t"
|
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"mov %%"REG_S", "BYTE "(%2) \n\t" |
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"jmp 2f \n\t"
|
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"1: \n\t"
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//eax:state ebx:low, edx:range, esi:RangeLPS
|
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"subl %%ecx, %%ebx \n\t"
|
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"movl %%esi, %%edx \n\t"
|
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"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t" |
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"shll %%cl, %%ebx \n\t"
|
| 437 |
"shll %%cl, %%edx \n\t"
|
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"movzbl "MANGLE(ff_h264_lps_state)"(%0), %%ecx \n\t" |
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"movb %%cl, (%1) \n\t"
|
| 440 |
"add $1, %0 \n\t"
|
| 441 |
"test %%bx, %%bx \n\t"
|
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" jnz 2f \n\t"
|
| 443 |
|
| 444 |
"mov "BYTE "(%2), %%"REG_c" \n\t" |
| 445 |
"movzwl (%%"REG_c"), %%esi \n\t" |
| 446 |
"bswap %%esi \n\t"
|
| 447 |
"shrl $15, %%esi \n\t"
|
| 448 |
"subl $0xFFFF, %%esi \n\t"
|
| 449 |
"add $2, %%"REG_c" \n\t" |
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"mov %%"REG_c", "BYTE "(%2) \n\t" |
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|
| 452 |
"leal -1(%%ebx), %%ecx \n\t"
|
| 453 |
"xorl %%ebx, %%ecx \n\t"
|
| 454 |
"shrl $15, %%ecx \n\t"
|
| 455 |
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t" |
| 456 |
"neg %%ecx \n\t"
|
| 457 |
"add $7, %%ecx \n\t"
|
| 458 |
|
| 459 |
"shll %%cl , %%esi \n\t"
|
| 460 |
"addl %%esi, %%ebx \n\t"
|
| 461 |
"2: \n\t"
|
| 462 |
"movl %%edx, "RANGE "(%2) \n\t" |
| 463 |
"movl %%ebx, "LOW "(%2) \n\t" |
| 464 |
:"=&a"(bit) //FIXME this is fragile gcc either runs out of registers or miscompiles it (for example if "+a"(bit) or "+m"(*state) is used |
| 465 |
:"r"(state), "r"(c) |
| 466 |
: "%"REG_c, "%ebx", "%edx", "%"REG_S, "memory" |
| 467 |
); |
| 468 |
bit&=1;
|
| 469 |
#else /* BRANCHLESS_CABAC_DECODER */ |
| 470 |
|
| 471 |
|
| 472 |
#if defined HAVE_FAST_CMOV
|
| 473 |
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
|
| 474 |
"mov "tmp" , %%ecx \n\t"\ |
| 475 |
"shl $17 , "tmp" \n\t"\ |
| 476 |
"cmp "low" , "tmp" \n\t"\ |
| 477 |
"cmova %%ecx , "range" \n\t"\ |
| 478 |
"sbb %%ecx , %%ecx \n\t"\
|
| 479 |
"and %%ecx , "tmp" \n\t"\ |
| 480 |
"sub "tmp" , "low" \n\t"\ |
| 481 |
"xor %%ecx , "ret" \n\t" |
| 482 |
#else /* HAVE_FAST_CMOV */ |
| 483 |
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
|
| 484 |
"mov "tmp" , %%ecx \n\t"\ |
| 485 |
"shl $17 , "tmp" \n\t"\ |
| 486 |
"sub "low" , "tmp" \n\t"\ |
| 487 |
"sar $31 , "tmp" \n\t" /*lps_mask*/\ |
| 488 |
"sub %%ecx , "range" \n\t" /*RangeLPS - range*/\ |
| 489 |
"and "tmp" , "range" \n\t" /*(RangeLPS - range)&lps_mask*/\ |
| 490 |
"add %%ecx , "range" \n\t" /*new range*/\ |
| 491 |
"shl $17 , %%ecx \n\t"\
|
| 492 |
"and "tmp" , %%ecx \n\t"\ |
| 493 |
"sub %%ecx , "low" \n\t"\ |
| 494 |
"xor "tmp" , "ret" \n\t" |
| 495 |
#endif /* HAVE_FAST_CMOV */ |
| 496 |
|
| 497 |
|
| 498 |
#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
|
| 499 |
"movzbl "statep" , "ret" \n\t"\ |
| 500 |
"mov "range" , "tmp" \n\t"\ |
| 501 |
"and $0xC0 , "range" \n\t"\ |
| 502 |
"movzbl "MANGLE(ff_h264_lps_range)"("ret", "range", 2), "range" \n\t"\ |
| 503 |
"sub "range" , "tmp" \n\t"\ |
| 504 |
BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\ |
| 505 |
"movzbl " MANGLE(ff_h264_norm_shift) "("range"), %%ecx \n\t"\ |
| 506 |
"shl %%cl , "range" \n\t"\ |
| 507 |
"movzbl "MANGLE(ff_h264_mlps_state)"+128("ret"), "tmp" \n\t"\ |
| 508 |
"mov "tmpbyte" , "statep" \n\t"\ |
| 509 |
"shl %%cl , "low" \n\t"\ |
| 510 |
"test "lowword" , "lowword" \n\t"\ |
| 511 |
" jnz 1f \n\t"\
|
| 512 |
"mov "BYTE"("cabac"), %%"REG_c" \n\t"\ |
| 513 |
"movzwl (%%"REG_c") , "tmp" \n\t"\ |
| 514 |
"bswap "tmp" \n\t"\ |
| 515 |
"shr $15 , "tmp" \n\t"\ |
| 516 |
"sub $0xFFFF , "tmp" \n\t"\ |
| 517 |
"add $2 , %%"REG_c" \n\t"\ |
| 518 |
"mov %%"REG_c" , "BYTE "("cabac") \n\t"\ |
| 519 |
"lea -1("low") , %%ecx \n\t"\ |
| 520 |
"xor "low" , %%ecx \n\t"\ |
| 521 |
"shr $15 , %%ecx \n\t"\
|
| 522 |
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\ |
| 523 |
"neg %%ecx \n\t"\
|
| 524 |
"add $7 , %%ecx \n\t"\
|
| 525 |
"shl %%cl , "tmp" \n\t"\ |
| 526 |
"add "tmp" , "low" \n\t"\ |
| 527 |
"1: \n\t"
|
| 528 |
|
| 529 |
asm volatile( |
| 530 |
"movl "RANGE "(%2), %%esi \n\t" |
| 531 |
"movl "LOW "(%2), %%ebx \n\t" |
| 532 |
BRANCHLESS_GET_CABAC("%0", "%2", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl") |
| 533 |
"movl %%esi, "RANGE "(%2) \n\t" |
| 534 |
"movl %%ebx, "LOW "(%2) \n\t" |
| 535 |
|
| 536 |
:"=&a"(bit)
|
| 537 |
:"r"(state), "r"(c) |
| 538 |
: "%"REG_c, "%ebx", "%edx", "%esi", "memory" |
| 539 |
); |
| 540 |
bit&=1;
|
| 541 |
#endif /* BRANCHLESS_CABAC_DECODER */ |
| 542 |
#else /* defined(ARCH_X86) && defined(HAVE_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS) */ |
| 543 |
int s = *state;
|
| 544 |
int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + s]; |
| 545 |
int bit, lps_mask av_unused;
|
| 546 |
|
| 547 |
c->range -= RangeLPS; |
| 548 |
#ifndef BRANCHLESS_CABAC_DECODER
|
| 549 |
if(c->low < (c->range<<(CABAC_BITS+1))){ |
| 550 |
bit= s&1;
|
| 551 |
*state= ff_h264_mps_state[s]; |
| 552 |
renorm_cabac_decoder_once(c); |
| 553 |
}else{
|
| 554 |
bit= ff_h264_norm_shift[RangeLPS]; |
| 555 |
c->low -= (c->range<<(CABAC_BITS+1));
|
| 556 |
*state= ff_h264_lps_state[s]; |
| 557 |
c->range = RangeLPS<<bit; |
| 558 |
c->low <<= bit; |
| 559 |
bit= (s&1)^1; |
| 560 |
|
| 561 |
if(!(c->low & CABAC_MASK)){
|
| 562 |
refill2(c); |
| 563 |
} |
| 564 |
} |
| 565 |
#else /* BRANCHLESS_CABAC_DECODER */ |
| 566 |
lps_mask= ((c->range<<(CABAC_BITS+1)) - c->low)>>31; |
| 567 |
|
| 568 |
c->low -= (c->range<<(CABAC_BITS+1)) & lps_mask;
|
| 569 |
c->range += (RangeLPS - c->range) & lps_mask; |
| 570 |
|
| 571 |
s^=lps_mask; |
| 572 |
*state= (ff_h264_mlps_state+128)[s];
|
| 573 |
bit= s&1;
|
| 574 |
|
| 575 |
lps_mask= ff_h264_norm_shift[c->range]; |
| 576 |
c->range<<= lps_mask; |
| 577 |
c->low <<= lps_mask; |
| 578 |
if(!(c->low & CABAC_MASK))
|
| 579 |
refill2(c); |
| 580 |
#endif /* BRANCHLESS_CABAC_DECODER */ |
| 581 |
#endif /* defined(ARCH_X86) && defined(HAVE_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS) */ |
| 582 |
return bit;
|
| 583 |
} |
| 584 |
|
| 585 |
static int av_noinline get_cabac_noinline(CABACContext *c, uint8_t * const state){ |
| 586 |
return get_cabac_inline(c,state);
|
| 587 |
} |
| 588 |
|
| 589 |
static int get_cabac(CABACContext *c, uint8_t * const state){ |
| 590 |
return get_cabac_inline(c,state);
|
| 591 |
} |
| 592 |
|
| 593 |
static int get_cabac_bypass(CABACContext *c){ |
| 594 |
#if 0 //not faster
|
| 595 |
int bit;
|
| 596 |
asm volatile(
|
| 597 |
"movl "RANGE "(%1), %%ebx \n\t"
|
| 598 |
"movl "LOW "(%1), %%eax \n\t"
|
| 599 |
"shl $17, %%ebx \n\t"
|
| 600 |
"add %%eax, %%eax \n\t"
|
| 601 |
"sub %%ebx, %%eax \n\t"
|
| 602 |
"cdq \n\t"
|
| 603 |
"and %%edx, %%ebx \n\t"
|
| 604 |
"add %%ebx, %%eax \n\t"
|
| 605 |
"test %%ax, %%ax \n\t"
|
| 606 |
" jnz 1f \n\t"
|
| 607 |
"movl "BYTE "(%1), %%"REG_b" \n\t"
|
| 608 |
"subl $0xFFFF, %%eax \n\t"
|
| 609 |
"movzwl (%%"REG_b"), %%ecx \n\t"
|
| 610 |
"bswap %%ecx \n\t"
|
| 611 |
"shrl $15, %%ecx \n\t"
|
| 612 |
"addl $2, %%"REG_b" \n\t"
|
| 613 |
"addl %%ecx, %%eax \n\t"
|
| 614 |
"movl %%"REG_b", "BYTE "(%1) \n\t"
|
| 615 |
"1: \n\t"
|
| 616 |
"movl %%eax, "LOW "(%1) \n\t"
|
| 617 |
|
| 618 |
:"=&d"(bit)
|
| 619 |
:"r"(c)
|
| 620 |
: "%eax", "%"REG_b, "%ecx", "memory"
|
| 621 |
);
|
| 622 |
return bit+1;
|
| 623 |
#else
|
| 624 |
int range;
|
| 625 |
c->low += c->low; |
| 626 |
|
| 627 |
if(!(c->low & CABAC_MASK))
|
| 628 |
refill(c); |
| 629 |
|
| 630 |
range= c->range<<(CABAC_BITS+1);
|
| 631 |
if(c->low < range){
|
| 632 |
return 0; |
| 633 |
}else{
|
| 634 |
c->low -= range; |
| 635 |
return 1; |
| 636 |
} |
| 637 |
#endif
|
| 638 |
} |
| 639 |
|
| 640 |
|
| 641 |
static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){ |
| 642 |
#if defined(ARCH_X86) && !(defined(PIC) && defined(__GNUC__))
|
| 643 |
asm volatile( |
| 644 |
"movl "RANGE "(%1), %%ebx \n\t" |
| 645 |
"movl "LOW "(%1), %%eax \n\t" |
| 646 |
"shl $17, %%ebx \n\t"
|
| 647 |
"add %%eax, %%eax \n\t"
|
| 648 |
"sub %%ebx, %%eax \n\t"
|
| 649 |
"cdq \n\t"
|
| 650 |
"and %%edx, %%ebx \n\t"
|
| 651 |
"add %%ebx, %%eax \n\t"
|
| 652 |
"xor %%edx, %%ecx \n\t"
|
| 653 |
"sub %%edx, %%ecx \n\t"
|
| 654 |
"test %%ax, %%ax \n\t"
|
| 655 |
" jnz 1f \n\t"
|
| 656 |
"mov "BYTE "(%1), %%"REG_b" \n\t" |
| 657 |
"subl $0xFFFF, %%eax \n\t"
|
| 658 |
"movzwl (%%"REG_b"), %%edx \n\t" |
| 659 |
"bswap %%edx \n\t"
|
| 660 |
"shrl $15, %%edx \n\t"
|
| 661 |
"add $2, %%"REG_b" \n\t" |
| 662 |
"addl %%edx, %%eax \n\t"
|
| 663 |
"mov %%"REG_b", "BYTE "(%1) \n\t" |
| 664 |
"1: \n\t"
|
| 665 |
"movl %%eax, "LOW "(%1) \n\t" |
| 666 |
|
| 667 |
:"+c"(val)
|
| 668 |
:"r"(c)
|
| 669 |
: "%eax", "%"REG_b, "%edx", "memory" |
| 670 |
); |
| 671 |
return val;
|
| 672 |
#else
|
| 673 |
int range, mask;
|
| 674 |
c->low += c->low; |
| 675 |
|
| 676 |
if(!(c->low & CABAC_MASK))
|
| 677 |
refill(c); |
| 678 |
|
| 679 |
range= c->range<<(CABAC_BITS+1);
|
| 680 |
c->low -= range; |
| 681 |
mask= c->low >> 31;
|
| 682 |
range &= mask; |
| 683 |
c->low += range; |
| 684 |
return (val^mask)-mask;
|
| 685 |
#endif
|
| 686 |
} |
| 687 |
|
| 688 |
//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!)
|
| 689 |
//FIXME use some macros to avoid duplicatin get_cabac (cannot be done yet as that would make optimization work hard)
|
| 690 |
#if defined(ARCH_X86) && defined(HAVE_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS)
|
| 691 |
static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *significant_coeff_ctx_base, int *index){ |
| 692 |
void *end= significant_coeff_ctx_base + max_coeff - 1; |
| 693 |
int minusstart= -(int)significant_coeff_ctx_base; |
| 694 |
int minusindex= 4-(int)index; |
| 695 |
int coeff_count;
|
| 696 |
asm volatile( |
| 697 |
"movl "RANGE "(%3), %%esi \n\t" |
| 698 |
"movl "LOW "(%3), %%ebx \n\t" |
| 699 |
|
| 700 |
"2: \n\t"
|
| 701 |
|
| 702 |
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al") |
| 703 |
|
| 704 |
"test $1, %%edx \n\t"
|
| 705 |
" jz 3f \n\t"
|
| 706 |
|
| 707 |
BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al") |
| 708 |
|
| 709 |
"mov %2, %%"REG_a" \n\t" |
| 710 |
"movl %4, %%ecx \n\t"
|
| 711 |
"add %1, %%"REG_c" \n\t" |
| 712 |
"movl %%ecx, (%%"REG_a") \n\t" |
| 713 |
|
| 714 |
"test $1, %%edx \n\t"
|
| 715 |
" jnz 4f \n\t"
|
| 716 |
|
| 717 |
"add $4, %%"REG_a" \n\t" |
| 718 |
"mov %%"REG_a", %2 \n\t" |
| 719 |
|
| 720 |
"3: \n\t"
|
| 721 |
"add $1, %1 \n\t"
|
| 722 |
"cmp %5, %1 \n\t"
|
| 723 |
" jb 2b \n\t"
|
| 724 |
"mov %2, %%"REG_a" \n\t" |
| 725 |
"movl %4, %%ecx \n\t"
|
| 726 |
"add %1, %%"REG_c" \n\t" |
| 727 |
"movl %%ecx, (%%"REG_a") \n\t" |
| 728 |
"4: \n\t"
|
| 729 |
"add %6, %%eax \n\t"
|
| 730 |
"shr $2, %%eax \n\t"
|
| 731 |
|
| 732 |
"movl %%esi, "RANGE "(%3) \n\t" |
| 733 |
"movl %%ebx, "LOW "(%3) \n\t" |
| 734 |
:"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)\ |
| 735 |
:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex)\ |
| 736 |
: "%"REG_c, "%ebx", "%edx", "%esi", "memory"\ |
| 737 |
); |
| 738 |
return coeff_count;
|
| 739 |
} |
| 740 |
|
| 741 |
static int decode_significance_8x8_x86(CABACContext *c, uint8_t *significant_coeff_ctx_base, int *index, uint8_t *sig_off){ |
| 742 |
int minusindex= 4-(int)index; |
| 743 |
int coeff_count;
|
| 744 |
long last=0; |
| 745 |
asm volatile( |
| 746 |
"movl "RANGE "(%3), %%esi \n\t" |
| 747 |
"movl "LOW "(%3), %%ebx \n\t" |
| 748 |
|
| 749 |
"mov %1, %%"REG_D" \n\t" |
| 750 |
"2: \n\t"
|
| 751 |
|
| 752 |
"mov %6, %%"REG_a" \n\t" |
| 753 |
"movzbl (%%"REG_a", %%"REG_D"), %%edi \n\t" |
| 754 |
"add %5, %%"REG_D" \n\t" |
| 755 |
|
| 756 |
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al") |
| 757 |
|
| 758 |
"mov %1, %%edi \n\t"
|
| 759 |
"test $1, %%edx \n\t"
|
| 760 |
" jz 3f \n\t"
|
| 761 |
|
| 762 |
"movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t" |
| 763 |
"add %5, %%"REG_D" \n\t" |
| 764 |
|
| 765 |
BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al") |
| 766 |
|
| 767 |
"mov %2, %%"REG_a" \n\t" |
| 768 |
"mov %1, %%edi \n\t"
|
| 769 |
"movl %%edi, (%%"REG_a") \n\t" |
| 770 |
|
| 771 |
"test $1, %%edx \n\t"
|
| 772 |
" jnz 4f \n\t"
|
| 773 |
|
| 774 |
"add $4, %%"REG_a" \n\t" |
| 775 |
"mov %%"REG_a", %2 \n\t" |
| 776 |
|
| 777 |
"3: \n\t"
|
| 778 |
"addl $1, %%edi \n\t"
|
| 779 |
"mov %%edi, %1 \n\t"
|
| 780 |
"cmpl $63, %%edi \n\t"
|
| 781 |
" jb 2b \n\t"
|
| 782 |
"mov %2, %%"REG_a" \n\t" |
| 783 |
"movl %%edi, (%%"REG_a") \n\t" |
| 784 |
"4: \n\t"
|
| 785 |
"addl %4, %%eax \n\t"
|
| 786 |
"shr $2, %%eax \n\t"
|
| 787 |
|
| 788 |
"movl %%esi, "RANGE "(%3) \n\t" |
| 789 |
"movl %%ebx, "LOW "(%3) \n\t" |
| 790 |
:"=&a"(coeff_count),"+m"(last), "+m"(index)\ |
| 791 |
:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off)\ |
| 792 |
: "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"\ |
| 793 |
); |
| 794 |
return coeff_count;
|
| 795 |
} |
| 796 |
#endif /* defined(ARCH_X86) && && defined(HAVE_7REGS) && defined(HAVE_EBX_AVAILABLE) && !defined(BROKEN_RELOCATIONS) */ |
| 797 |
|
| 798 |
/**
|
| 799 |
*
|
| 800 |
* @return the number of bytes read or 0 if no end
|
| 801 |
*/
|
| 802 |
static int get_cabac_terminate(CABACContext *c){ |
| 803 |
c->range -= 2;
|
| 804 |
if(c->low < c->range<<(CABAC_BITS+1)){ |
| 805 |
renorm_cabac_decoder_once(c); |
| 806 |
return 0; |
| 807 |
}else{
|
| 808 |
return c->bytestream - c->bytestream_start;
|
| 809 |
} |
| 810 |
} |
| 811 |
|
| 812 |
#if 0
|
| 813 |
/**
|
| 814 |
* Get (truncated) unary binarization.
|
| 815 |
*/
|
| 816 |
static int get_cabac_u(CABACContext *c, uint8_t * state, int max, int max_index, int truncated){
|
| 817 |
int i;
|
| 818 |
|
| 819 |
for(i=0; i<max; i++){
|
| 820 |
if(get_cabac(c, state)==0)
|
| 821 |
return i;
|
| 822 |
|
| 823 |
if(i< max_index) state++;
|
| 824 |
}
|
| 825 |
|
| 826 |
return truncated ? max : -1;
|
| 827 |
}
|
| 828 |
|
| 829 |
/**
|
| 830 |
* get unary exp golomb k-th order binarization.
|
| 831 |
*/
|
| 832 |
static int get_cabac_ueg(CABACContext *c, uint8_t * state, int max, int is_signed, int k, int max_index){
|
| 833 |
int i, v;
|
| 834 |
int m= 1<<k;
|
| 835 |
|
| 836 |
if(get_cabac(c, state)==0)
|
| 837 |
return 0;
|
| 838 |
|
| 839 |
if(0 < max_index) state++;
|
| 840 |
|
| 841 |
for(i=1; i<max; i++){
|
| 842 |
if(get_cabac(c, state)==0){
|
| 843 |
if(is_signed && get_cabac_bypass(c)){
|
| 844 |
return -i;
|
| 845 |
}else
|
| 846 |
return i;
|
| 847 |
}
|
| 848 |
|
| 849 |
if(i < max_index) state++;
|
| 850 |
}
|
| 851 |
|
| 852 |
while(get_cabac_bypass(c)){
|
| 853 |
i+= m;
|
| 854 |
m+= m;
|
| 855 |
}
|
| 856 |
|
| 857 |
v=0;
|
| 858 |
while(m>>=1){
|
| 859 |
v+= v + get_cabac_bypass(c);
|
| 860 |
}
|
| 861 |
i += v;
|
| 862 |
|
| 863 |
if(is_signed && get_cabac_bypass(c)){
|
| 864 |
return -i;
|
| 865 |
}else
|
| 866 |
return i;
|
| 867 |
}
|
| 868 |
#endif /* 0 */
|
| 869 |
|
| 870 |
#endif /* FFMPEG_CABAC_H */ |