/* * 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 */ #include "libavcodec/cabac.c" #define SIZE 10240 #include "libavutil/lfg.h"#include "libavcodec/avcodec.h" 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_mlps_state[128 + *state];    }else{        c->low += c->range - RangeLPS;        c->range = RangeLPS;        *state= ff_h264_mlps_state[127 - *state];    }     renorm_cabac_encoder(c);} /** * @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;    }} /** * * @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);         av_assert0(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    }     return (put_bits_count(&c->pb)+7)>>3;} int main(void){    CABACContext c;    uint8_t b[9*SIZE];    uint8_t r[9*SIZE];    int i, ret = 0;    uint8_t state[10]= {0};    AVLFG prng;     av_lfg_init(&prng, 1);    ff_init_cabac_encoder(&c, b, SIZE);     for(i=0; i<SIZE; i++){        if(2*i<SIZE) r[i] = av_lfg_get(&prng) % 7;        else         r[i] = (i>>8)&1;    }     for(i=0; i<SIZE; i++){        put_cabac_bypass(&c, r[i]&1);    }     for(i=0; i<SIZE; i++){        put_cabac(&c, state, r[i]&1);    }     i= put_cabac_terminate(&c, 1);    b[i++] = av_lfg_get(&prng);    b[i  ] = av_lfg_get(&prng);     ff_init_cabac_decoder(&c, b, SIZE);     memset(state, 0, sizeof(state));     for(i=0; i<SIZE; i++){        if( (r[i]&1) != get_cabac_bypass(&c) ) {            av_log(NULL, AV_LOG_ERROR, "CABAC bypass failure at %d\n", i);            ret = 1;        }    }     for(i=0; i<SIZE; i++){        if( (r[i]&1) != get_cabac_noinline(&c, state) ) {            av_log(NULL, AV_LOG_ERROR, "CABAC failure at %d\n", i);            ret = 1;        }    }    if(!get_cabac_terminate(&c)) {        av_log(NULL, AV_LOG_ERROR, "where's the Terminator?\n");        ret = 1;    }     return ret;}