/* * 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_functions.h"#include "libavcodec/cabac.c" #define SIZE 10240 #include "libavutil/lfg.h"#include "libavcodec/put_bits.h" typedef struct CABACTestContext {    CABACContext dec;    int outstanding_count;    PutBitContext pb;} CABACTestContext; static inline void put_cabac_bit(CABACTestContext *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(CABACTestContext *c){    while (c->dec.range < 0x100) {        //FIXME optimize        if (c->dec.low < 0x100) {            put_cabac_bit(c, 0);        } else if (c->dec.low < 0x200) {            c->outstanding_count++;            c->dec.low -= 0x100;        }else{            put_cabac_bit(c, 1);            c->dec.low -= 0x200;        }         c->dec.range += c->dec.range;        c->dec.low   += c->dec.low;    }} static void put_cabac(CABACTestContext *c, uint8_t * const state, int bit){    int RangeLPS = ff_h264_lps_range[2 * (c->dec.range & 0xC0) + *state];     if(bit == ((*state)&1)){        c->dec.range -= RangeLPS;        *state    = ff_h264_mlps_state[128 + *state];    }else{        c->dec.low  += c->dec.range - RangeLPS;        c->dec.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(CABACTestContext *c, int bit){    c->dec.low += c->dec.low;     if(bit){        c->dec.low += c->dec.range;    }//FIXME optimize    if (c->dec.low < 0x200) {        put_cabac_bit(c, 0);    } else if (c->dec.low < 0x400) {        c->outstanding_count++;        c->dec.low -= 0x200;    }else{        put_cabac_bit(c, 1);        c->dec.low -= 0x400;    }} /** * * @return the number of bytes written */static int put_cabac_terminate(CABACTestContext *c, int bit){    c->dec.range -= 2;     if(!bit){        renorm_cabac_encoder(c);    }else{        c->dec.low  += c->dec.range;        c->dec.range = 2;         renorm_cabac_encoder(c);         av_assert0(c->dec.low <= 0x1FF);        put_cabac_bit(c, c->dec.low >> 9);        put_bits(&c->pb, 2, ((c->dec.low >> 7) & 3) | 1);         flush_put_bits(&c->pb); //FIXME FIXME FIXME XXX wrong    }     return put_bytes_count(&c->pb, 1);} /** * @param buf_size size of buf in bits */static void init_cabac_encoder(CABACTestContext *c, uint8_t *buf, int buf_size){    init_put_bits(&c->pb, buf, buf_size);     c->dec.low   = 0;    c->dec.range = 0x1FE;    c->outstanding_count = 0;    c->pb.bit_left++; //avoids firstBitFlag} int main(void){    CABACTestContext 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);    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.dec, b, SIZE);     memset(state, 0, sizeof(state));     for(i=0; i<SIZE; i++){        if ((r[i] & 1) != get_cabac_bypass(&c.dec)) {            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.dec, state)) {            av_log(NULL, AV_LOG_ERROR, "CABAC failure at %d\n", i);            ret = 1;        }    }    if (!get_cabac_terminate(&c.dec)) {        av_log(NULL, AV_LOG_ERROR, "where's the Terminator?\n");        ret = 1;    }     return ret;}