Exemplo n.º 1
0
opus_uint32 ec_dec_uint(ec_dec *_this,opus_uint32 _ft){
  unsigned ft;
  unsigned s;
  int      ftb;
  /*In order to optimize EC_ILOG(), it is undefined for the value 0.*/
  celt_assert(_ft>1);
  _ft--;
  ftb=EC_ILOG(_ft);
  if(ftb>EC_UINT_BITS){
    opus_uint32 t;
    ftb-=EC_UINT_BITS;
    ft=(unsigned)(_ft>>ftb)+1;
    s=ec_decode(_this,ft);
    ec_dec_update(_this,s,s+1,ft);
    t=(opus_uint32)s<<ftb|ec_dec_bits(_this,ftb);
    if(t<=_ft)return t;
    _this->error=1;
    return _ft;
  }
Exemplo n.º 2
0
unsigned ec_decode_bin(ec_dec *_this,unsigned bits){
#if 0
  return ec_decode(_this, 1U<<bits);
#else
  unsigned value=0;
  int count=0;
  _this->nb_end_bits += bits;
  while (bits>=_this->end_bits_left)
  {
    value |= _this->end_byte>>(8-_this->end_bits_left)<<count;
    count += _this->end_bits_left;
    bits -= _this->end_bits_left;
    _this->end_byte=ec_byte_look_at_end(_this->buf);
    _this->end_bits_left = 8;
  }
  value |= ((_this->end_byte>>(8-_this->end_bits_left))&((1<<bits)-1))<<count;
  _this->end_bits_left -= bits;
  return value;
#endif
}
Exemplo n.º 3
0
ec_uint32 ec_dec_uint(ec_dec *_this,ec_uint32 _ft){
  ec_uint32 t;
  unsigned  ft;
  unsigned  s;
  int       ftb;
  t=0;
  /*In order to optimize EC_ILOG(), it is undefined for the value 0.*/
  celt_assert(_ft>1);
  _ft--;
  ftb=EC_ILOG(_ft);
  if(ftb>EC_UNIT_BITS){
    ftb-=EC_UNIT_BITS;
    ft=(unsigned)(_ft>>ftb)+1;
    s=ec_decode(_this,ft);
    ec_dec_update(_this,s,s+1,ft);
    t=t<<EC_UNIT_BITS|s;
    t = t<<ftb|ec_dec_bits(_this,ftb);
    if (t>_ft)
    {
       celt_notify("uint decode error");
       t = _ft;
    }
    return t;
  } else {
Exemplo n.º 4
0
int ec_laplace_decode_start(ec_dec *dec, int decay, int fs)
{
   int val=0;
   int fl, fh, fm;
   unsigned int ft;
   fl = 0;
   ft = 32768;
   fh = fs;
   fm = ec_decode(dec, ft);
   while (fm >= fh && fs != 0)
   {
      fl = fh;
      fs = (fs*(ec_int32)decay)>>14;
      if (fs == 0 && fh+2 <= ft)
      {
         fs = 1;
      }
      fh += fs*2;
      val++;
   }
   if (fl>0)
   {
      if (fm >= fl+fs)
      {
         val = -val;
         fl += fs;
      } else {
         fh -= fs;
      }
   }
   /* Preventing an infinite loop in case something screws up in the decoding */
   if (fl==fh)
      fl--;
   ec_dec_update(dec, fl, fh, ft);
   return val;
}
Exemplo n.º 5
0
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;
  const char    *env_seed;
  ret=0;
  entropy=0;
    if (_argc > 2) {
	fprintf(stderr, "Usage: %s [<seed>]\n", _argv[0]);
	return 1;
    }
  env_seed = getenv("SEED");
  if (_argc > 1)
    seed = atoi(_argv[1]);
  else if (env_seed)
    seed = atoi(env_seed);
  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;
}