ref: 657dea717ea4596a6fb98d42483a5e6cc86ebafd
dir: /celt/tests/test_unit_entropy.c/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <time.h>
#include "entcode.h"
#include "entenc.h"
#include "entdec.h"
#include <string.h>
#include "entenc.c"
#include "entdec.c"
#include "entcode.c"
#ifndef M_LOG2E
# define M_LOG2E 1.4426950408889634074
#endif
#define DATA_SIZE 10000000
#define DATA_SIZE2 10000
int main(int _argc,char **_argv){
ec_enc enc;
ec_dec dec;
long nbits;
long nbits2;
double entropy;
int ft;
int ftb;
int sz;
int i;
int ret;
unsigned int sym;
unsigned int seed;
unsigned char *ptr;
ret=0;
entropy=0;
if (_argc > 2) {
fprintf(stderr, "Usage: %s [<seed>]\n", _argv[0]);
return 1;
}
if (_argc > 1)
seed = atoi(_argv[1]);
else
seed = time(NULL);
/*Testing encoding of raw bit values.*/
ptr = (unsigned char *)malloc(DATA_SIZE);
ec_enc_init(&enc,ptr, DATA_SIZE);
for(ft=2;ft<1024;ft++){
for(i=0;i<ft;i++){
entropy+=log(ft)*M_LOG2E;
ec_enc_uint(&enc,i,ft);
}
}
/*Testing encoding of raw bit values.*/
for(ftb=1;ftb<16;ftb++){
for(i=0;i<(1<<ftb);i++){
entropy+=ftb;
nbits=ec_tell(&enc);
ec_enc_bits(&enc,i,ftb);
nbits2=ec_tell(&enc);
if(nbits2-nbits!=ftb){
fprintf(stderr,"Used %li bits to encode %i bits directly.\n",
nbits2-nbits,ftb);
ret=-1;
}
}
}
nbits=ec_tell_frac(&enc);
ec_enc_done(&enc);
fprintf(stderr,
"Encoded %0.2lf bits of entropy to %0.2lf bits (%0.3lf%% wasted).\n",
entropy,ldexp(nbits,-3),100*(nbits-ldexp(entropy,3))/nbits);
fprintf(stderr,"Packed to %li bytes.\n",(long)ec_range_bytes(&enc));
ec_dec_init(&dec,ptr,DATA_SIZE);
for(ft=2;ft<1024;ft++){
for(i=0;i<ft;i++){
sym=ec_dec_uint(&dec,ft);
if(sym!=(unsigned)i){
fprintf(stderr,"Decoded %i instead of %i with ft of %i.\n",sym,i,ft);
ret=-1;
}
}
}
for(ftb=1;ftb<16;ftb++){
for(i=0;i<(1<<ftb);i++){
sym=ec_dec_bits(&dec,ftb);
if(sym!=(unsigned)i){
fprintf(stderr,"Decoded %i instead of %i with ftb of %i.\n",sym,i,ftb);
ret=-1;
}
}
}
nbits2=ec_tell_frac(&dec);
if(nbits!=nbits2){
fprintf(stderr,
"Reported number of bits used was %0.2lf, should be %0.2lf.\n",
ldexp(nbits2,-3),ldexp(nbits,-3));
ret=-1;
}
/*Testing an encoder bust prefers range coder data over raw bits.
This isn't a general guarantee, will only work for data that is buffered in
the encoder state and not yet stored in the user buffer, and should never
get used in practice.
It's mostly here for code coverage completeness.*/
/*Start with a 16-bit buffer.*/
ec_enc_init(&enc,ptr,2);
/*Write 7 raw bits.*/
ec_enc_bits(&enc,0x55,7);
/*Write 12.3 bits of range coder data.*/
ec_enc_uint(&enc,1,2);
ec_enc_uint(&enc,1,3);
ec_enc_uint(&enc,1,4);
ec_enc_uint(&enc,1,5);
ec_enc_uint(&enc,2,6);
ec_enc_uint(&enc,6,7);
ec_enc_done(&enc);
ec_dec_init(&dec,ptr,2);
if(!enc.error
/*The raw bits should have been overwritten by the range coder data.*/
||ec_dec_bits(&dec,7)!=0x05
/*And all the range coder data should have been encoded correctly.*/
||ec_dec_uint(&dec,2)!=1
||ec_dec_uint(&dec,3)!=1
||ec_dec_uint(&dec,4)!=1
||ec_dec_uint(&dec,5)!=1
||ec_dec_uint(&dec,6)!=2
||ec_dec_uint(&dec,7)!=6){
fprintf(stderr,"Encoder bust overwrote range coder data with raw bits.\n");
ret=-1;
}
srand(seed);
fprintf(stderr,"Testing random streams... Random seed: %u (%.4X)\n", seed, rand() % 65536);
for(i=0;i<409600;i++){
unsigned *data;
unsigned *tell;
unsigned tell_bits;
int j;
int zeros;
ft=rand()/((RAND_MAX>>(rand()%11U))+1U)+10;
sz=rand()/((RAND_MAX>>(rand()%9U))+1U);
data=(unsigned *)malloc(sz*sizeof(*data));
tell=(unsigned *)malloc((sz+1)*sizeof(*tell));
ec_enc_init(&enc,ptr,DATA_SIZE2);
zeros = rand()%13==0;
tell[0]=ec_tell_frac(&enc);
for(j=0;j<sz;j++){
if (zeros)
data[j]=0;
else
data[j]=rand()%ft;
ec_enc_uint(&enc,data[j],ft);
tell[j+1]=ec_tell_frac(&enc);
}
if (rand()%2==0)
while(ec_tell(&enc)%8 != 0)
ec_enc_uint(&enc, rand()%2, 2);
tell_bits = ec_tell(&enc);
ec_enc_done(&enc);
if(tell_bits!=(unsigned)ec_tell(&enc)){
fprintf(stderr,"ec_tell() changed after ec_enc_done(): %i instead of %i (Random seed: %u)\n",
ec_tell(&enc),tell_bits,seed);
ret=-1;
}
if ((tell_bits+7)/8 < ec_range_bytes(&enc))
{
fprintf (stderr, "ec_tell() lied, there's %i bytes instead of %d (Random seed: %u)\n",
ec_range_bytes(&enc), (tell_bits+7)/8,seed);
ret=-1;
}
ec_dec_init(&dec,ptr,DATA_SIZE2);
if(ec_tell_frac(&dec)!=tell[0]){
fprintf(stderr,
"Tell mismatch between encoder and decoder at symbol %i: %i instead of %i (Random seed: %u).\n",
0,ec_tell_frac(&dec),tell[0],seed);
}
for(j=0;j<sz;j++){
sym=ec_dec_uint(&dec,ft);
if(sym!=data[j]){
fprintf(stderr,
"Decoded %i instead of %i with ft of %i at position %i of %i (Random seed: %u).\n",
sym,data[j],ft,j,sz,seed);
ret=-1;
}
if(ec_tell_frac(&dec)!=tell[j+1]){
fprintf(stderr,
"Tell mismatch between encoder and decoder at symbol %i: %i instead of %i (Random seed: %u).\n",
j+1,ec_tell_frac(&dec),tell[j+1],seed);
}
}
free(tell);
free(data);
}
/*Test compatibility between multiple different encode/decode routines.*/
for(i=0;i<409600;i++){
unsigned *logp1;
unsigned *data;
unsigned *tell;
unsigned *enc_method;
int j;
sz=rand()/((RAND_MAX>>(rand()%9U))+1U);
logp1=(unsigned *)malloc(sz*sizeof(*logp1));
data=(unsigned *)malloc(sz*sizeof(*data));
tell=(unsigned *)malloc((sz+1)*sizeof(*tell));
enc_method=(unsigned *)malloc(sz*sizeof(*enc_method));
ec_enc_init(&enc,ptr,DATA_SIZE2);
tell[0]=ec_tell_frac(&enc);
for(j=0;j<sz;j++){
data[j]=rand()/((RAND_MAX>>1)+1);
logp1[j]=(rand()%15)+1;
enc_method[j]=rand()/((RAND_MAX>>2)+1);
switch(enc_method[j]){
case 0:{
ec_encode(&enc,data[j]?(1<<logp1[j])-1:0,
(1<<logp1[j])-(data[j]?0:1),1<<logp1[j]);
}break;
case 1:{
ec_encode_bin(&enc,data[j]?(1<<logp1[j])-1:0,
(1<<logp1[j])-(data[j]?0:1),logp1[j]);
}break;
case 2:{
ec_enc_bit_logp(&enc,data[j],logp1[j]);
}break;
case 3:{
unsigned char icdf[2];
icdf[0]=1;
icdf[1]=0;
ec_enc_icdf(&enc,data[j],icdf,logp1[j]);
}break;
}
tell[j+1]=ec_tell_frac(&enc);
}
ec_enc_done(&enc);
if((ec_tell(&enc)+7U)/8U<ec_range_bytes(&enc)){
fprintf(stderr,"tell() lied, there's %i bytes instead of %d (Random seed: %u)\n",
ec_range_bytes(&enc),(ec_tell(&enc)+7)/8,seed);
ret=-1;
}
ec_dec_init(&dec,ptr,DATA_SIZE2);
if(ec_tell_frac(&dec)!=tell[0]){
fprintf(stderr,
"Tell mismatch between encoder and decoder at symbol %i: %i instead of %i (Random seed: %u).\n",
0,ec_tell_frac(&dec),tell[0],seed);
}
for(j=0;j<sz;j++){
int fs;
int dec_method;
dec_method=rand()/((RAND_MAX>>2)+1);
switch(dec_method){
case 0:{
fs=ec_decode(&dec,1<<logp1[j]);
sym=fs>=(1<<logp1[j])-1;
ec_dec_update(&dec,sym?(1<<logp1[j])-1:0,
(1<<logp1[j])-(sym?0:1),1<<logp1[j]);
}break;
case 1:{
fs=ec_decode_bin(&dec,logp1[j]);
sym=fs>=(1<<logp1[j])-1;
ec_dec_update(&dec,sym?(1<<logp1[j])-1:0,
(1<<logp1[j])-(sym?0:1),1<<logp1[j]);
}break;
case 2:{
sym=ec_dec_bit_logp(&dec,logp1[j]);
}break;
case 3:{
unsigned char icdf[2];
icdf[0]=1;
icdf[1]=0;
sym=ec_dec_icdf(&dec,icdf,logp1[j]);
}break;
}
if(sym!=data[j]){
fprintf(stderr,
"Decoded %i instead of %i with logp1 of %i at position %i of %i (Random seed: %u).\n",
sym,data[j],logp1[j],j,sz,seed);
fprintf(stderr,"Encoding method: %i, decoding method: %i\n",
enc_method[j],dec_method);
ret=-1;
}
if(ec_tell_frac(&dec)!=tell[j+1]){
fprintf(stderr,
"Tell mismatch between encoder and decoder at symbol %i: %i instead of %i (Random seed: %u).\n",
j+1,ec_tell_frac(&dec),tell[j+1],seed);
}
}
free(enc_method);
free(tell);
free(data);
free(logp1);
}
ec_enc_init(&enc,ptr,DATA_SIZE2);
ec_enc_bit_logp(&enc,0,1);
ec_enc_bit_logp(&enc,0,1);
ec_enc_bit_logp(&enc,0,1);
ec_enc_bit_logp(&enc,0,1);
ec_enc_bit_logp(&enc,0,2);
ec_enc_patch_initial_bits(&enc,3,2);
if(enc.error){
fprintf(stderr,"patch_initial_bits failed");
ret=-1;
}
ec_enc_patch_initial_bits(&enc,0,5);
if(!enc.error){
fprintf(stderr,"patch_initial_bits didn't fail when it should have");
ret=-1;
}
ec_enc_done(&enc);
if(ec_range_bytes(&enc)!=1||ptr[0]!=192){
fprintf(stderr,"Got %d when expecting 192 for patch_initial_bits",ptr[0]);
ret=-1;
}
ec_enc_init(&enc,ptr,DATA_SIZE2);
ec_enc_bit_logp(&enc,0,1);
ec_enc_bit_logp(&enc,0,1);
ec_enc_bit_logp(&enc,1,6);
ec_enc_bit_logp(&enc,0,2);
ec_enc_patch_initial_bits(&enc,0,2);
if(enc.error){
fprintf(stderr,"patch_initial_bits failed");
ret=-1;
}
ec_enc_done(&enc);
if(ec_range_bytes(&enc)!=2||ptr[0]!=63){
fprintf(stderr,"Got %d when expecting 63 for patch_initial_bits",ptr[0]);
ret=-1;
}
ec_enc_init(&enc,ptr,2);
ec_enc_bit_logp(&enc,0,2);
for(i=0;i<48;i++){
ec_enc_bits(&enc,0,1);
}
ec_enc_done(&enc);
if(!enc.error){
fprintf(stderr,"Raw bits overfill didn't fail when it should have");
ret=-1;
}
ec_enc_init(&enc,ptr,2);
for(i=0;i<17;i++){
ec_enc_bits(&enc,0,1);
}
ec_enc_done(&enc);
if(!enc.error){
fprintf(stderr,"17 raw bits encoded in two bytes");
ret=-1;
}
free(ptr);
return ret;
}