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448 lines
13 KiB
C
448 lines
13 KiB
C
/********************************************************************
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* *
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* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
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* *
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* USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
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* GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
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* IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
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* *
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* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
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* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
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* *
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********************************************************************
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function: basic shared codebook operations
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********************************************************************/
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include <ogg/ogg.h>
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#include "misc.h"
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#include "ivorbiscodec.h"
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#include "codebook.h"
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/**** pack/unpack helpers ******************************************/
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int _ilog(unsigned int v){
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int ret=0;
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while(v){
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ret++;
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v>>=1;
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}
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return(ret);
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}
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/* 32 bit float (not IEEE; nonnormalized mantissa +
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biased exponent) : neeeeeee eeemmmmm mmmmmmmm mmmmmmmm
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Why not IEEE? It's just not that important here. */
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#define VQ_FEXP 10
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#define VQ_FMAN 21
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#define VQ_FEXP_BIAS 768 /* bias toward values smaller than 1. */
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static ogg_int32_t _float32_unpack(long val,int *point){
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long mant=val&0x1fffff;
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int sign=val&0x80000000;
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long exp =(val&0x7fe00000L)>>VQ_FMAN;
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exp-=(VQ_FMAN-1)+VQ_FEXP_BIAS;
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if(mant){
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while(!(mant&0x40000000)){
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mant<<=1;
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exp-=1;
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}
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if(sign)mant= -mant;
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}else{
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sign=0;
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exp=-9999;
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}
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*point=exp;
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return mant;
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}
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/* given a list of word lengths, generate a list of codewords. Works
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for length ordered or unordered, always assigns the lowest valued
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codewords first. Extended to handle unused entries (length 0) */
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ogg_uint32_t *_make_words(long *l,long n,long sparsecount){
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long i,j,count=0;
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ogg_uint32_t marker[33];
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ogg_uint32_t *r=(ogg_uint32_t *)_ogg_malloc((sparsecount?sparsecount:n)*sizeof(*r));
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memset(marker,0,sizeof(marker));
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for(i=0;i<n;i++){
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long length=l[i];
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if(length>0){
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ogg_uint32_t entry=marker[length];
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/* when we claim a node for an entry, we also claim the nodes
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below it (pruning off the imagined tree that may have dangled
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from it) as well as blocking the use of any nodes directly
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above for leaves */
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/* update ourself */
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if(length<32 && (entry>>length)){
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/* error condition; the lengths must specify an overpopulated tree */
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_ogg_free(r);
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return(NULL);
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}
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r[count++]=entry;
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/* Look to see if the next shorter marker points to the node
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above. if so, update it and repeat. */
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{
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for(j=length;j>0;j--){
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if(marker[j]&1){
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/* have to jump branches */
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if(j==1)
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marker[1]++;
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else
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marker[j]=marker[j-1]<<1;
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break; /* invariant says next upper marker would already
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have been moved if it was on the same path */
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}
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marker[j]++;
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}
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}
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/* prune the tree; the implicit invariant says all the longer
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markers were dangling from our just-taken node. Dangle them
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from our *new* node. */
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for(j=length+1;j<33;j++)
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if((marker[j]>>1) == entry){
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entry=marker[j];
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marker[j]=marker[j-1]<<1;
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}else
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break;
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}else
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if(sparsecount==0)count++;
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}
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/* sanity check the huffman tree; an underpopulated tree must be
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rejected. The only exception is the one-node pseudo-nil tree,
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which appears to be underpopulated because the tree doesn't
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really exist; there's only one possible 'codeword' or zero bits,
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but the above tree-gen code doesn't mark that. */
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if(sparsecount != 1){
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for(i=1;i<33;i++)
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if(marker[i] & (0xffffffffUL>>(32-i))){
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_ogg_free(r);
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return(NULL);
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}
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}
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/* bitreverse the words because our bitwise packer/unpacker is LSb
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endian */
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for(i=0,count=0;i<n;i++){
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ogg_uint32_t temp=0;
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for(j=0;j<l[i];j++){
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temp<<=1;
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temp|=(r[count]>>j)&1;
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}
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if(sparsecount){
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if(l[i])
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r[count++]=temp;
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}else
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r[count++]=temp;
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}
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return(r);
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}
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/* there might be a straightforward one-line way to do the below
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that's portable and totally safe against roundoff, but I haven't
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thought of it. Therefore, we opt on the side of caution */
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long _book_maptype1_quantvals(const static_codebook *b){
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/* get us a starting hint, we'll polish it below */
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int bits=_ilog(b->entries);
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int vals=b->entries>>((bits-1)*(b->dim-1)/b->dim);
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while(1){
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long acc=1;
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long acc1=1;
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int i;
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for(i=0;i<b->dim;i++){
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acc*=vals;
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acc1*=vals+1;
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}
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if(acc<=b->entries && acc1>b->entries){
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return(vals);
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}else{
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if(acc>b->entries){
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vals--;
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}else{
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vals++;
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}
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}
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}
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}
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/* different than what _book_unquantize does for mainline:
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we repack the book in a fixed point format that shares the same
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binary point. Upon first use, we can shift point if needed */
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/* we need to deal with two map types: in map type 1, the values are
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generated algorithmically (each column of the vector counts through
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the values in the quant vector). in map type 2, all the values came
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in in an explicit list. Both value lists must be unpacked */
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ogg_int32_t *_book_unquantize(const static_codebook *b,int n,int *sparsemap,
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int *maxpoint){
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long j,k,count=0;
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if(b->maptype==1 || b->maptype==2){
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int quantvals;
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int minpoint,delpoint;
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ogg_int32_t mindel=_float32_unpack(b->q_min,&minpoint);
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ogg_int32_t delta=_float32_unpack(b->q_delta,&delpoint);
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ogg_int32_t *r=(ogg_int32_t *)_ogg_calloc(n*b->dim,sizeof(*r));
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int *rp=(int *)_ogg_calloc(n*b->dim,sizeof(*rp));
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*maxpoint=minpoint;
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/* maptype 1 and 2 both use a quantized value vector, but
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different sizes */
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switch(b->maptype){
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case 1:
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/* most of the time, entries%dimensions == 0, but we need to be
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well defined. We define that the possible vales at each
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scalar is values == entries/dim. If entries%dim != 0, we'll
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have 'too few' values (values*dim<entries), which means that
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we'll have 'left over' entries; left over entries use zeroed
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values (and are wasted). So don't generate codebooks like
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that */
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quantvals=_book_maptype1_quantvals(b);
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for(j=0;j<b->entries;j++){
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if((sparsemap && b->lengthlist[j]) || !sparsemap){
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ogg_int32_t last=0;
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int lastpoint=0;
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int indexdiv=1;
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for(k=0;k<b->dim;k++){
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int index= (j/indexdiv)%quantvals;
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int point=0;
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int val=VFLOAT_MULTI(delta,delpoint,
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abs(b->quantlist[index]),&point);
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val=VFLOAT_ADD(mindel,minpoint,val,point,&point);
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val=VFLOAT_ADD(last,lastpoint,val,point,&point);
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if(b->q_sequencep){
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last=val;
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lastpoint=point;
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}
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if(sparsemap){
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r[sparsemap[count]*b->dim+k]=val;
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rp[sparsemap[count]*b->dim+k]=point;
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}else{
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r[count*b->dim+k]=val;
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rp[count*b->dim+k]=point;
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}
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if(*maxpoint<point)*maxpoint=point;
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indexdiv*=quantvals;
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}
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count++;
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}
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}
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break;
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case 2:
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for(j=0;j<b->entries;j++){
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if((sparsemap && b->lengthlist[j]) || !sparsemap){
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ogg_int32_t last=0;
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int lastpoint=0;
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for(k=0;k<b->dim;k++){
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int point=0;
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int val=VFLOAT_MULTI(delta,delpoint,
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abs(b->quantlist[j*b->dim+k]),&point);
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val=VFLOAT_ADD(mindel,minpoint,val,point,&point);
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val=VFLOAT_ADD(last,lastpoint,val,point,&point);
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if(b->q_sequencep){
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last=val;
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lastpoint=point;
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}
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if(sparsemap){
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r[sparsemap[count]*b->dim+k]=val;
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rp[sparsemap[count]*b->dim+k]=point;
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}else{
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r[count*b->dim+k]=val;
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rp[count*b->dim+k]=point;
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}
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if(*maxpoint<point)*maxpoint=point;
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}
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count++;
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}
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}
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break;
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}
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for(j=0;j<n*b->dim;j++)
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if(rp[j]<*maxpoint)
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r[j]>>=*maxpoint-rp[j];
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_ogg_free(rp);
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return(r);
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}
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return(NULL);
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}
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void vorbis_staticbook_destroy(static_codebook *b){
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if(b->quantlist)_ogg_free(b->quantlist);
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if(b->lengthlist)_ogg_free(b->lengthlist);
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memset(b,0,sizeof(*b));
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_ogg_free(b);
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}
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void vorbis_book_clear(codebook *b){
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/* static book is not cleared; we're likely called on the lookup and
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the static codebook belongs to the info struct */
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if(b->valuelist)_ogg_free(b->valuelist);
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if(b->codelist)_ogg_free(b->codelist);
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if(b->dec_index)_ogg_free(b->dec_index);
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if(b->dec_codelengths)_ogg_free(b->dec_codelengths);
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if(b->dec_firsttable)_ogg_free(b->dec_firsttable);
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memset(b,0,sizeof(*b));
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}
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static ogg_uint32_t bitreverse(ogg_uint32_t x){
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x= ((x>>16)&0x0000ffffUL) | ((x<<16)&0xffff0000UL);
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x= ((x>> 8)&0x00ff00ffUL) | ((x<< 8)&0xff00ff00UL);
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x= ((x>> 4)&0x0f0f0f0fUL) | ((x<< 4)&0xf0f0f0f0UL);
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x= ((x>> 2)&0x33333333UL) | ((x<< 2)&0xccccccccUL);
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return((x>> 1)&0x55555555UL) | ((x<< 1)&0xaaaaaaaaUL);
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}
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static int sort32a(const void *a,const void *b){
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return (**(ogg_uint32_t **)a>**(ogg_uint32_t **)b)-
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(**(ogg_uint32_t **)a<**(ogg_uint32_t **)b);
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}
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/* decode codebook arrangement is more heavily optimized than encode */
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int vorbis_book_init_decode(codebook *c,const static_codebook *s){
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int i,j,n=0,tabn;
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int *sortindex;
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memset(c,0,sizeof(*c));
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/* count actually used entries */
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for(i=0;i<s->entries;i++)
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if(s->lengthlist[i]>0)
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n++;
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c->entries=s->entries;
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c->used_entries=n;
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c->dim=s->dim;
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if(n>0){
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/* two different remappings go on here.
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First, we collapse the likely sparse codebook down only to
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actually represented values/words. This collapsing needs to be
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indexed as map-valueless books are used to encode original entry
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positions as integers.
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Second, we reorder all vectors, including the entry index above,
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by sorted bitreversed codeword to allow treeless decode. */
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/* perform sort */
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ogg_uint32_t *codes=_make_words(s->lengthlist,s->entries,c->used_entries);
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ogg_uint32_t **codep=(ogg_uint32_t **)alloca(sizeof(*codep)*n);
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if(codes==NULL)goto err_out;
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for(i=0;i<n;i++){
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codes[i]=bitreverse(codes[i]);
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codep[i]=codes+i;
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}
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qsort(codep,n,sizeof(*codep),sort32a);
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sortindex=(int *)alloca(n*sizeof(*sortindex));
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c->codelist=(ogg_uint32_t *)_ogg_malloc(n*sizeof(*c->codelist));
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/* the index is a reverse index */
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for(i=0;i<n;i++){
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int position=codep[i]-codes;
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sortindex[position]=i;
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}
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for(i=0;i<n;i++)
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c->codelist[sortindex[i]]=codes[i];
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_ogg_free(codes);
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c->valuelist=_book_unquantize(s,n,sortindex,&c->binarypoint);
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c->dec_index=(int *)_ogg_malloc(n*sizeof(*c->dec_index));
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for(n=0,i=0;i<s->entries;i++)
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if(s->lengthlist[i]>0)
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c->dec_index[sortindex[n++]]=i;
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c->dec_codelengths=(char *)_ogg_malloc(n*sizeof(*c->dec_codelengths));
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for(n=0,i=0;i<s->entries;i++)
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if(s->lengthlist[i]>0)
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c->dec_codelengths[sortindex[n++]]=s->lengthlist[i];
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c->dec_firsttablen=_ilog(c->used_entries)-4; /* this is magic */
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if(c->dec_firsttablen<5)c->dec_firsttablen=5;
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if(c->dec_firsttablen>8)c->dec_firsttablen=8;
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tabn=1<<c->dec_firsttablen;
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c->dec_firsttable=(ogg_uint32_t *)_ogg_calloc(tabn,sizeof(*c->dec_firsttable));
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c->dec_maxlength=0;
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for(i=0;i<n;i++){
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if(c->dec_maxlength<c->dec_codelengths[i])
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c->dec_maxlength=c->dec_codelengths[i];
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if(c->dec_codelengths[i]<=c->dec_firsttablen){
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ogg_uint32_t orig=bitreverse(c->codelist[i]);
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for(j=0;j<(1<<(c->dec_firsttablen-c->dec_codelengths[i]));j++)
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c->dec_firsttable[orig|(j<<c->dec_codelengths[i])]=i+1;
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}
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}
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/* now fill in 'unused' entries in the firsttable with hi/lo search
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hints for the non-direct-hits */
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{
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ogg_uint32_t mask=0xfffffffeUL<<(31-c->dec_firsttablen);
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long lo=0,hi=0;
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for(i=0;i<tabn;i++){
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ogg_uint32_t word=i<<(32-c->dec_firsttablen);
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if(c->dec_firsttable[bitreverse(word)]==0){
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while((lo+1)<n && c->codelist[lo+1]<=word)lo++;
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while( hi<n && word>=(c->codelist[hi]&mask))hi++;
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/* we only actually have 15 bits per hint to play with here.
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In order to overflow gracefully (nothing breaks, efficiency
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just drops), encode as the difference from the extremes. */
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{
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unsigned long loval=lo;
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unsigned long hival=n-hi;
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if(loval>0x7fff)loval=0x7fff;
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if(hival>0x7fff)hival=0x7fff;
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c->dec_firsttable[bitreverse(word)]=
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0x80000000UL | (loval<<15) | hival;
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}
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}
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}
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}
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}
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return(0);
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err_out:
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vorbis_book_clear(c);
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return(-1);
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}
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