--- a/misc/libtremor/tremor/codebook.c Tue Jul 23 14:01:23 2013 -0700
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,371 +0,0 @@
-/********************************************************************
- * *
- * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
- * *
- * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
- * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
- * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
- * *
- * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
- * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
- * *
- ********************************************************************
-
- function: basic codebook pack/unpack/code/decode operations
-
- ********************************************************************/
-
-#include <stdlib.h>
-#include <string.h>
-#include <math.h>
-#include "ogg.h"
-#include "ivorbiscodec.h"
-#include "codebook.h"
-#include "misc.h"
-
-/* unpacks a codebook from the packet buffer into the codebook struct,
- readies the codebook auxiliary structures for decode *************/
-int vorbis_staticbook_unpack(oggpack_buffer *opb,static_codebook *s){
- long i,j;
- memset(s,0,sizeof(*s));
-
- /* make sure alignment is correct */
- if(oggpack_read(opb,24)!=0x564342)goto _eofout;
-
- /* first the basic parameters */
- s->dim=oggpack_read(opb,16);
- s->entries=oggpack_read(opb,24);
- if(s->entries==-1)goto _eofout;
-
- /* codeword ordering.... length ordered or unordered? */
- switch((int)oggpack_read(opb,1)){
- case 0:
- /* unordered */
- s->lengthlist=(long *)_ogg_malloc(sizeof(*s->lengthlist)*s->entries);
-
- /* allocated but unused entries? */
- if(oggpack_read(opb,1)){
- /* yes, unused entries */
-
- for(i=0;i<s->entries;i++){
- if(oggpack_read(opb,1)){
- long num=oggpack_read(opb,5);
- if(num==-1)goto _eofout;
- s->lengthlist[i]=num+1;
- }else
- s->lengthlist[i]=0;
- }
- }else{
- /* all entries used; no tagging */
- for(i=0;i<s->entries;i++){
- long num=oggpack_read(opb,5);
- if(num==-1)goto _eofout;
- s->lengthlist[i]=num+1;
- }
- }
-
- break;
- case 1:
- /* ordered */
- {
- long length=oggpack_read(opb,5)+1;
- s->lengthlist=(long *)_ogg_malloc(sizeof(*s->lengthlist)*s->entries);
-
- for(i=0;i<s->entries;){
- long num=oggpack_read(opb,_ilog(s->entries-i));
- if(num==-1)goto _eofout;
- for(j=0;j<num && i<s->entries;j++,i++)
- s->lengthlist[i]=length;
- length++;
- }
- }
- break;
- default:
- /* EOF */
- return(-1);
- }
-
- /* Do we have a mapping to unpack? */
- switch((s->maptype=oggpack_read(opb,4))){
- case 0:
- /* no mapping */
- break;
- case 1: case 2:
- /* implicitly populated value mapping */
- /* explicitly populated value mapping */
-
- s->q_min=oggpack_read(opb,32);
- s->q_delta=oggpack_read(opb,32);
- s->q_quant=oggpack_read(opb,4)+1;
- s->q_sequencep=oggpack_read(opb,1);
-
- {
- int quantvals=0;
- switch(s->maptype){
- case 1:
- quantvals=_book_maptype1_quantvals(s);
- break;
- case 2:
- quantvals=s->entries*s->dim;
- break;
- }
-
- /* quantized values */
- s->quantlist=(long *)_ogg_malloc(sizeof(*s->quantlist)*quantvals);
- for(i=0;i<quantvals;i++)
- s->quantlist[i]=oggpack_read(opb,s->q_quant);
-
- if(quantvals&&s->quantlist[quantvals-1]==-1)goto _eofout;
- }
- break;
- default:
- goto _errout;
- }
-
- /* all set */
- return(0);
-
- _errout:
- _eofout:
- vorbis_staticbook_clear(s);
- return(-1);
-}
-
-/* the 'eliminate the decode tree' optimization actually requires the
- codewords to be MSb first, not LSb. This is an annoying inelegancy
- (and one of the first places where carefully thought out design
- turned out to be wrong; Vorbis II and future Ogg codecs should go
- to an MSb bitpacker), but not actually the huge hit it appears to
- be. The first-stage decode table catches most words so that
- bitreverse is not in the main execution path. */
-
-static ogg_uint32_t bitreverse(ogg_uint32_t x){
- x= ((x>>16)&0x0000ffff) | ((x<<16)&0xffff0000);
- x= ((x>> 8)&0x00ff00ff) | ((x<< 8)&0xff00ff00);
- x= ((x>> 4)&0x0f0f0f0f) | ((x<< 4)&0xf0f0f0f0);
- x= ((x>> 2)&0x33333333) | ((x<< 2)&0xcccccccc);
- return((x>> 1)&0x55555555) | ((x<< 1)&0xaaaaaaaa);
-}
-
-STIN long decode_packed_entry_number(codebook *book,
- oggpack_buffer *b){
- int read=book->dec_maxlength;
- long lo,hi;
- long lok = oggpack_look(b,book->dec_firsttablen);
-
- if (lok >= 0) {
- long entry = book->dec_firsttable[lok];
- if(entry&0x80000000UL){
- lo=(entry>>15)&0x7fff;
- hi=book->used_entries-(entry&0x7fff);
- }else{
- oggpack_adv(b, book->dec_codelengths[entry-1]);
- return(entry-1);
- }
- }else{
- lo=0;
- hi=book->used_entries;
- }
-
- lok = oggpack_look(b, read);
-
- while(lok<0 && read>1)
- lok = oggpack_look(b, --read);
-
- if(lok<0){
- oggpack_adv(b,1); /* force eop */
- return -1;
- }
-
- /* bisect search for the codeword in the ordered list */
- {
- ogg_uint32_t testword=bitreverse((ogg_uint32_t)lok);
-
- while(hi-lo>1){
- long p=(hi-lo)>>1;
- long test=book->codelist[lo+p]>testword;
- lo+=p&(test-1);
- hi-=p&(-test);
- }
-
- if(book->dec_codelengths[lo]<=read){
- oggpack_adv(b, book->dec_codelengths[lo]);
- return(lo);
- }
- }
-
- oggpack_adv(b, read+1);
- return(-1);
-}
-
-/* Decode side is specced and easier, because we don't need to find
- matches using different criteria; we simply read and map. There are
- two things we need to do 'depending':
-
- We may need to support interleave. We don't really, but it's
- convenient to do it here rather than rebuild the vector later.
-
- Cascades may be additive or multiplicitive; this is not inherent in
- the codebook, but set in the code using the codebook. Like
- interleaving, it's easiest to do it here.
- addmul==0 -> declarative (set the value)
- addmul==1 -> additive
- addmul==2 -> multiplicitive */
-
-/* returns the [original, not compacted] entry number or -1 on eof *********/
-long vorbis_book_decode(codebook *book, oggpack_buffer *b){
- if(book->used_entries>0){
- long packed_entry=decode_packed_entry_number(book,b);
- if(packed_entry>=0)
- return(book->dec_index[packed_entry]);
- }
-
- /* if there's no dec_index, the codebook unpacking isn't collapsed */
- return(-1);
-}
-
-/* returns 0 on OK or -1 on eof *************************************/
-long vorbis_book_decodevs_add(codebook *book,ogg_int32_t *a,
- oggpack_buffer *b,int n,int point){
- if(book->used_entries>0){
- int step=n/book->dim;
- long *entry = (long *)alloca(sizeof(*entry)*step);
- ogg_int32_t **t = (ogg_int32_t **)alloca(sizeof(*t)*step);
- int i,j,o;
- int shift=point-book->binarypoint;
-
- if(shift>=0){
- for (i = 0; i < step; i++) {
- entry[i]=decode_packed_entry_number(book,b);
- if(entry[i]==-1)return(-1);
- t[i] = book->valuelist+entry[i]*book->dim;
- }
- for(i=0,o=0;i<book->dim;i++,o+=step)
- for (j=0;j<step;j++)
- a[o+j]+=t[j][i]>>shift;
- }else{
- for (i = 0; i < step; i++) {
- entry[i]=decode_packed_entry_number(book,b);
- if(entry[i]==-1)return(-1);
- t[i] = book->valuelist+entry[i]*book->dim;
- }
- for(i=0,o=0;i<book->dim;i++,o+=step)
- for (j=0;j<step;j++)
- a[o+j]+=t[j][i]<<-shift;
- }
- }
- return(0);
-}
-
-long vorbis_book_decodev_add(codebook *book,ogg_int32_t *a,
- oggpack_buffer *b,int n,int point){
- if(book->used_entries>0){
- int i,j,entry;
- ogg_int32_t *t;
- int shift=point-book->binarypoint;
-
- if(shift>=0){
- for(i=0;i<n;){
- entry = decode_packed_entry_number(book,b);
- if(entry==-1)return(-1);
- t = book->valuelist+entry*book->dim;
- for (j=0;j<book->dim;)
- a[i++]+=t[j++]>>shift;
- }
- }else{
- for(i=0;i<n;){
- entry = decode_packed_entry_number(book,b);
- if(entry==-1)return(-1);
- t = book->valuelist+entry*book->dim;
- for (j=0;j<book->dim;)
- a[i++]+=t[j++]<<-shift;
- }
- }
- }
- return(0);
-}
-
-long vorbis_book_decodev_set(codebook *book,ogg_int32_t *a,
- oggpack_buffer *b,int n,int point){
- if(book->used_entries>0){
- int i,j,entry;
- ogg_int32_t *t;
- int shift=point-book->binarypoint;
-
- if(shift>=0){
-
- for(i=0;i<n;){
- entry = decode_packed_entry_number(book,b);
- if(entry==-1)return(-1);
- t = book->valuelist+entry*book->dim;
- for (j=0;j<book->dim;){
- a[i++]=t[j++]>>shift;
- }
- }
- }else{
-
- for(i=0;i<n;){
- entry = decode_packed_entry_number(book,b);
- if(entry==-1)return(-1);
- t = book->valuelist+entry*book->dim;
- for (j=0;j<book->dim;){
- a[i++]=t[j++]<<-shift;
- }
- }
- }
- }else{
-
- int i,j;
- for(i=0;i<n;){
- for (j=0;j<book->dim;){
- a[i++]=0;
- }
- }
- }
- return(0);
-}
-
-long vorbis_book_decodevv_add(codebook *book,ogg_int32_t **a,\
- long offset,int ch,
- oggpack_buffer *b,int n,int point){
- if(book->used_entries>0){
- long i,j,entry;
- int chptr=0;
- int shift=point-book->binarypoint;
-
- if(shift>=0){
-
- for(i=offset;i<offset+n;){
- entry = decode_packed_entry_number(book,b);
- if(entry==-1)return(-1);
- {
- const ogg_int32_t *t = book->valuelist+entry*book->dim;
- for (j=0;j<book->dim;j++){
- a[chptr++][i]+=t[j]>>shift;
- if(chptr==ch){
- chptr=0;
- i++;
- }
- }
- }
- }
- }else{
-
- for(i=offset;i<offset+n;){
- entry = decode_packed_entry_number(book,b);
- if(entry==-1)return(-1);
- {
- const ogg_int32_t *t = book->valuelist+entry*book->dim;
- for (j=0;j<book->dim;j++){
- a[chptr++][i]+=t[j]<<-shift;
- if(chptr==ch){
- chptr=0;
- i++;
- }
- }
- }
- }
- }
- }
- return(0);
-}