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392 lines
10 KiB
C
392 lines
10 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 codebook pack/unpack/code/decode operations
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********************************************************************/
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <ogg/ogg.h>
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#include "ivorbiscodec.h"
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#include "codebook.h"
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#include "misc.h"
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/* unpacks a codebook from the packet buffer into the codebook struct,
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readies the codebook auxiliary structures for decode *************/
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static_codebook *vorbis_staticbook_unpack(oggpack_buffer *opb){
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long i,j;
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static_codebook *s=_ogg_calloc(1,sizeof(*s));
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/* make sure alignment is correct */
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if(oggpack_read(opb,24)!=0x564342)goto _eofout;
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/* first the basic parameters */
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s->dim=oggpack_read(opb,16);
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s->entries=oggpack_read(opb,24);
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if(s->entries==-1)goto _eofout;
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if(_ilog(s->dim)+_ilog(s->entries)>24)goto _eofout;
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/* codeword ordering.... length ordered or unordered? */
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switch((int)oggpack_read(opb,1)){
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case 0:{
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long unused;
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/* allocated but unused entries? */
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unused=oggpack_read(opb,1);
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if((s->entries*(unused?1:5)+7)>>3>opb->storage-oggpack_bytes(opb))
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goto _eofout;
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/* unordered */
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s->lengthlist=(long *)_ogg_malloc(sizeof(*s->lengthlist)*s->entries);
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/* allocated but unused entries? */
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if(unused){
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/* yes, unused entries */
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for(i=0;i<s->entries;i++){
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if(oggpack_read(opb,1)){
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long num=oggpack_read(opb,5);
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if(num==-1)goto _eofout;
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s->lengthlist[i]=num+1;
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}else
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s->lengthlist[i]=0;
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}
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}else{
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/* all entries used; no tagging */
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for(i=0;i<s->entries;i++){
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long num=oggpack_read(opb,5);
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if(num==-1)goto _eofout;
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s->lengthlist[i]=num+1;
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}
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}
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break;
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}
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case 1:
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/* ordered */
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{
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long length=oggpack_read(opb,5)+1;
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if(length==0)goto _eofout;
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s->lengthlist=(long *)_ogg_malloc(sizeof(*s->lengthlist)*s->entries);
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for(i=0;i<s->entries;){
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long num=oggpack_read(opb,_ilog(s->entries-i));
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if(num==-1)goto _eofout;
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if(length>32 || num>s->entries-i ||
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(num>0 && (num-1)>>(length>>1)>>((length+1)>>1))>0){
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goto _errout;
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}
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for(j=0;j<num;j++,i++)
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s->lengthlist[i]=length;
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length++;
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}
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}
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break;
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default:
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/* EOF */
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goto _eofout;
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}
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/* Do we have a mapping to unpack? */
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switch((s->maptype=oggpack_read(opb,4))){
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case 0:
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/* no mapping */
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break;
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case 1: case 2:
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/* implicitly populated value mapping */
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/* explicitly populated value mapping */
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s->q_min=oggpack_read(opb,32);
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s->q_delta=oggpack_read(opb,32);
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s->q_quant=oggpack_read(opb,4)+1;
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s->q_sequencep=oggpack_read(opb,1);
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if(s->q_sequencep==-1)goto _eofout;
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{
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int quantvals=0;
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switch(s->maptype){
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case 1:
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quantvals=(s->dim==0?0:_book_maptype1_quantvals(s));
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break;
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case 2:
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quantvals=s->entries*s->dim;
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break;
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}
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/* quantized values */
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if((quantvals*s->q_quant+7)>>3>opb->storage-oggpack_bytes(opb))
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goto _eofout;
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s->quantlist=(long *)_ogg_malloc(sizeof(*s->quantlist)*quantvals);
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for(i=0;i<quantvals;i++)
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s->quantlist[i]=oggpack_read(opb,s->q_quant);
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if(quantvals&&s->quantlist[quantvals-1]==-1)goto _eofout;
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}
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break;
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default:
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goto _errout;
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}
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/* all set */
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return(s);
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_errout:
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_eofout:
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vorbis_staticbook_destroy(s);
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return(NULL);
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}
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/* the 'eliminate the decode tree' optimization actually requires the
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codewords to be MSb first, not LSb. This is an annoying inelegancy
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(and one of the first places where carefully thought out design
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turned out to be wrong; Vorbis II and future Ogg codecs should go
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to an MSb bitpacker), but not actually the huge hit it appears to
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be. The first-stage decode table catches most words so that
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bitreverse is not in the main execution path. */
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static ogg_uint32_t bitreverse(ogg_uint32_t x){
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x= ((x>>16)&0x0000ffff) | ((x<<16)&0xffff0000);
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x= ((x>> 8)&0x00ff00ff) | ((x<< 8)&0xff00ff00);
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x= ((x>> 4)&0x0f0f0f0f) | ((x<< 4)&0xf0f0f0f0);
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x= ((x>> 2)&0x33333333) | ((x<< 2)&0xcccccccc);
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return((x>> 1)&0x55555555) | ((x<< 1)&0xaaaaaaaa);
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}
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STIN long decode_packed_entry_number(codebook *book,
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oggpack_buffer *b){
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int read=book->dec_maxlength;
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long lo,hi;
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long lok = oggpack_look(b,book->dec_firsttablen);
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if (lok >= 0) {
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long entry = book->dec_firsttable[lok];
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if(entry&0x80000000UL){
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lo=(entry>>15)&0x7fff;
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hi=book->used_entries-(entry&0x7fff);
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}else{
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oggpack_adv(b, book->dec_codelengths[entry-1]);
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return(entry-1);
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}
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}else{
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lo=0;
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hi=book->used_entries;
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}
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lok = oggpack_look(b, read);
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while(lok<0 && read>1)
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lok = oggpack_look(b, --read);
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if(lok<0){
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oggpack_adv(b,1); /* force eop */
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return -1;
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}
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/* bisect search for the codeword in the ordered list */
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{
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ogg_uint32_t testword=bitreverse((ogg_uint32_t)lok);
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while(hi-lo>1){
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long p=(hi-lo)>>1;
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long test=book->codelist[lo+p]>testword;
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lo+=p&(test-1);
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hi-=p&(-test);
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}
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if(book->dec_codelengths[lo]<=read){
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oggpack_adv(b, book->dec_codelengths[lo]);
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return(lo);
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}
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}
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oggpack_adv(b, read+1);
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return(-1);
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}
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/* Decode side is specced and easier, because we don't need to find
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matches using different criteria; we simply read and map. There are
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two things we need to do 'depending':
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We may need to support interleave. We don't really, but it's
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convenient to do it here rather than rebuild the vector later.
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Cascades may be additive or multiplicitive; this is not inherent in
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the codebook, but set in the code using the codebook. Like
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interleaving, it's easiest to do it here.
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addmul==0 -> declarative (set the value)
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addmul==1 -> additive
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addmul==2 -> multiplicitive */
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/* returns the [original, not compacted] entry number or -1 on eof *********/
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long vorbis_book_decode(codebook *book, oggpack_buffer *b){
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if(book->used_entries>0){
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long packed_entry=decode_packed_entry_number(book,b);
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if(packed_entry>=0)
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return(book->dec_index[packed_entry]);
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}
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/* if there's no dec_index, the codebook unpacking isn't collapsed */
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return(-1);
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}
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/* returns 0 on OK or -1 on eof *************************************/
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/* decode vector / dim granularity gaurding is done in the upper layer */
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long vorbis_book_decodevs_add(codebook *book,ogg_int32_t *a,
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oggpack_buffer *b,int n,int point){
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if(book->used_entries>0){
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int step=n/book->dim;
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long *entry = (long *)alloca(sizeof(*entry)*step);
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ogg_int32_t **t = (ogg_int32_t **)alloca(sizeof(*t)*step);
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int i,j,o;
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int shift=point-book->binarypoint;
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if(shift>=0){
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for (i = 0; i < step; i++) {
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entry[i]=decode_packed_entry_number(book,b);
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if(entry[i]==-1)return(-1);
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t[i] = book->valuelist+entry[i]*book->dim;
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}
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for(i=0,o=0;i<book->dim;i++,o+=step)
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for (j=0;j<step;j++)
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a[o+j]+=t[j][i]>>shift;
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}else{
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for (i = 0; i < step; i++) {
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entry[i]=decode_packed_entry_number(book,b);
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if(entry[i]==-1)return(-1);
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t[i] = book->valuelist+entry[i]*book->dim;
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}
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for(i=0,o=0;i<book->dim;i++,o+=step)
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for (j=0;j<step;j++)
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a[o+j]+=t[j][i]<<-shift;
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}
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}
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return(0);
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}
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/* decode vector / dim granularity gaurding is done in the upper layer */
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long vorbis_book_decodev_add(codebook *book,ogg_int32_t *a,
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oggpack_buffer *b,int n,int point){
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if(book->used_entries>0){
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int i,j,entry;
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ogg_int32_t *t;
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int shift=point-book->binarypoint;
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if(shift>=0){
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for(i=0;i<n;){
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entry = decode_packed_entry_number(book,b);
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if(entry==-1)return(-1);
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t = book->valuelist+entry*book->dim;
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for (j=0;j<book->dim;)
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a[i++]+=t[j++]>>shift;
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}
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}else{
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for(i=0;i<n;){
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entry = decode_packed_entry_number(book,b);
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if(entry==-1)return(-1);
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t = book->valuelist+entry*book->dim;
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for (j=0;j<book->dim;)
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a[i++]+=t[j++]<<-shift;
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}
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}
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}
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return(0);
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}
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/* unlike the others, we guard against n not being an integer number
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of <dim> internally rather than in the upper layer (called only by
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floor0) */
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long vorbis_book_decodev_set(codebook *book,ogg_int32_t *a,
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oggpack_buffer *b,int n,int point){
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if(book->used_entries>0){
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int i,j,entry;
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ogg_int32_t *t;
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int shift=point-book->binarypoint;
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if(shift>=0){
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for(i=0;i<n;){
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entry = decode_packed_entry_number(book,b);
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if(entry==-1)return(-1);
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t = book->valuelist+entry*book->dim;
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for (j=0;i<n && j<book->dim;){
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a[i++]=t[j++]>>shift;
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}
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}
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}else{
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for(i=0;i<n;){
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entry = decode_packed_entry_number(book,b);
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if(entry==-1)return(-1);
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t = book->valuelist+entry*book->dim;
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for (j=0;i<n && j<book->dim;){
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a[i++]=t[j++]<<-shift;
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}
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}
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}
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}else{
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int i,j;
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for(i=0;i<n;){
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a[i++]=0;
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}
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}
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return(0);
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}
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/* decode vector / dim granularity gaurding is done in the upper layer */
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long vorbis_book_decodevv_add(codebook *book,ogg_int32_t **a,\
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long offset,int ch,
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oggpack_buffer *b,int n,int point){
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if(book->used_entries>0){
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long i,j,entry;
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int chptr=0;
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int shift=point-book->binarypoint;
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if(shift>=0){
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for(i=offset;i<offset+n;){
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entry = decode_packed_entry_number(book,b);
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if(entry==-1)return(-1);
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{
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const ogg_int32_t *t = book->valuelist+entry*book->dim;
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for (j=0;j<book->dim;j++){
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a[chptr++][i]+=t[j]>>shift;
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if(chptr==ch){
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chptr=0;
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i++;
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}
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}
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}
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}
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}else{
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for(i=offset;i<offset+n;){
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entry = decode_packed_entry_number(book,b);
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if(entry==-1)return(-1);
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{
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const ogg_int32_t *t = book->valuelist+entry*book->dim;
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for (j=0;j<book->dim;j++){
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a[chptr++][i]+=t[j]<<-shift;
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if(chptr==ch){
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chptr=0;
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i++;
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}
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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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}
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