mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-04 23:38:20 +02:00
191 lines
4.6 KiB
C
191 lines
4.6 KiB
C
/*
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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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#include "libavcodec/cabac.c"
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#define SIZE 10240
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#include "libavutil/lfg.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/put_bits.h"
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typedef struct CABACTestContext {
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CABACContext dec;
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int outstanding_count;
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PutBitContext pb;
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} CABACTestContext;
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static inline void put_cabac_bit(CABACTestContext *c, int b)
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{
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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(CABACTestContext *c)
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{
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while (c->dec.range < 0x100) {
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//FIXME optimize
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if (c->dec.low < 0x100) {
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put_cabac_bit(c, 0);
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} else if (c->dec.low < 0x200) {
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c->outstanding_count++;
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c->dec.low -= 0x100;
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}else{
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put_cabac_bit(c, 1);
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c->dec.low -= 0x200;
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}
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c->dec.range += c->dec.range;
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c->dec.low += c->dec.low;
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}
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}
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static void put_cabac(CABACTestContext *c, uint8_t * const state, int bit)
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{
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int RangeLPS = ff_h264_lps_range[2 * (c->dec.range & 0xC0) + *state];
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if(bit == ((*state)&1)){
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c->dec.range -= RangeLPS;
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*state = ff_h264_mlps_state[128 + *state];
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}else{
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c->dec.low += c->dec.range - RangeLPS;
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c->dec.range = RangeLPS;
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*state= ff_h264_mlps_state[127 - *state];
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}
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renorm_cabac_encoder(c);
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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(CABACTestContext *c, int bit)
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{
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c->dec.low += c->dec.low;
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if(bit){
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c->dec.low += c->dec.range;
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}
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//FIXME optimize
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if (c->dec.low < 0x200) {
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put_cabac_bit(c, 0);
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} else if (c->dec.low < 0x400) {
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c->outstanding_count++;
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c->dec.low -= 0x200;
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}else{
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put_cabac_bit(c, 1);
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c->dec.low -= 0x400;
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}
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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(CABACTestContext *c, int bit)
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{
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c->dec.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->dec.low += c->dec.range;
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c->dec.range = 2;
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renorm_cabac_encoder(c);
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av_assert0(c->dec.low <= 0x1FF);
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put_cabac_bit(c, c->dec.low >> 9);
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put_bits(&c->pb, 2, ((c->dec.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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return put_bytes_count(&c->pb, 1);
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}
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/**
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* @param buf_size size of buf in bits
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*/
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static void init_cabac_encoder(CABACTestContext *c, uint8_t *buf, int buf_size)
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{
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init_put_bits(&c->pb, buf, buf_size);
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c->dec.low = 0;
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c->dec.range = 0x1FE;
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c->outstanding_count = 0;
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c->pb.bit_left++; //avoids firstBitFlag
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}
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int main(void){
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CABACTestContext c;
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uint8_t b[9*SIZE];
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uint8_t r[9*SIZE];
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int i, ret = 0;
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uint8_t state[10]= {0};
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AVLFG prng;
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av_lfg_init(&prng, 1);
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init_cabac_encoder(&c, b, SIZE);
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for(i=0; i<SIZE; i++){
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if(2*i<SIZE) r[i] = av_lfg_get(&prng) % 7;
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else r[i] = (i>>8)&1;
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}
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for(i=0; i<SIZE; i++){
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put_cabac_bypass(&c, r[i]&1);
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}
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for(i=0; i<SIZE; i++){
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put_cabac(&c, state, r[i]&1);
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}
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i= put_cabac_terminate(&c, 1);
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b[i++] = av_lfg_get(&prng);
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b[i ] = av_lfg_get(&prng);
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ff_init_cabac_decoder(&c.dec, b, SIZE);
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memset(state, 0, sizeof(state));
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for(i=0; i<SIZE; i++){
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if ((r[i] & 1) != get_cabac_bypass(&c.dec)) {
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av_log(NULL, AV_LOG_ERROR, "CABAC bypass failure at %d\n", i);
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ret = 1;
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}
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}
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for(i=0; i<SIZE; i++){
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if ((r[i] & 1) != get_cabac_noinline(&c.dec, state)) {
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av_log(NULL, AV_LOG_ERROR, "CABAC failure at %d\n", i);
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ret = 1;
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}
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}
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if (!get_cabac_terminate(&c.dec)) {
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av_log(NULL, AV_LOG_ERROR, "where's the Terminator?\n");
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ret = 1;
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}
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return ret;
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}
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