devs/foxbox
1
0
Fork 0
forked from len0rd/rockbox
Code Pull requests Activity

Vorbis: Apply various bugfixes from upstream Tremor.

Browse source 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13756 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Magnus Holmgren 2007-07-01 17:58:49 +00:00
parent 9af4289770
commit 932b20ec62
6 changed files with 290 additions and 260 deletions
Download patch file Download diff file Expand all files Collapse all files

140
apps/codecs/Tremor/sharedbook.c
View file

@ -337,24 +337,21 @@ int vorbis_book_init_decode(codebook *c,const static_codebook *s){
c->used_entries=n;
c->dim=s->dim;
c->q_min=s->q_min;
c->q_delta=s->q_delta;
/* two different remappings go on here.
First, we collapse the likely sparse codebook down only to
actually represented values/words. This collapsing needs to be
indexed as map-valueless books are used to encode original entry
positions as integers.
Second, we reorder all vectors, including the entry index above,
by sorted bitreversed codeword to allow treeless decode. */
{
if(n>0){
/* two different remappings go on here.
First, we collapse the likely sparse codebook down only to
actually represented values/words. This collapsing needs to be
indexed as map-valueless books are used to encode original entry
positions as integers.
Second, we reorder all vectors, including the entry index above,
by sorted bitreversed codeword to allow treeless decode. */
/* perform sort */
ogg_uint32_t *codes=_make_words(s->lengthlist,s->entries,c->used_entries);
ogg_uint32_t **codep=(ogg_uint32_t **)ogg_tmpmalloc(sizeof(*codep)*n);
if(codes==NULL||codep==NULL)goto err_out;
for(i=0;i<n;i++){
@ -375,67 +372,68 @@ int vorbis_book_init_decode(codebook *c,const static_codebook *s){
for(i=0;i<n;i++)
c->codelist[sortindex[i]]=codes[i];
/* _ogg_free(codes); */
}
c->valuelist=_book_unquantize(s,n,sortindex,&c->binarypoint);
c->dec_index=(int *)_ogg_malloc(n*sizeof(*c->dec_index));
for(n=0,i=0;i<s->entries;i++)
if(s->lengthlist[i]>0)
c->dec_index[sortindex[n++]]=i;
c->dec_codelengths=(char *)_ogg_malloc(n*sizeof(*c->dec_codelengths));
for(n=0,i=0;i<s->entries;i++)
if(s->lengthlist[i]>0)
c->dec_codelengths[sortindex[n++]]=s->lengthlist[i];
c->dec_firsttablen=_ilog(c->used_entries)-4; /* this is magic */
if(c->dec_firsttablen<5)c->dec_firsttablen=5;
if(c->dec_firsttablen>8)c->dec_firsttablen=8;
tabn=1<<c->dec_firsttablen;
c->dec_firsttable=(ogg_uint32_t *)_ogg_calloc(tabn,sizeof(*c->dec_firsttable));
c->dec_maxlength=0;
for(i=0;i<n;i++){
if(c->dec_maxlength<c->dec_codelengths[i])
c->dec_maxlength=c->dec_codelengths[i];
if(c->dec_codelengths[i]<=c->dec_firsttablen){
ogg_uint32_t orig=bitreverse(c->codelist[i]);
for(j=0;j<(1<<(c->dec_firsttablen-c->dec_codelengths[i]));j++)
c->dec_firsttable[orig|(j<<c->dec_codelengths[i])]=i+1;
c->valuelist=_book_unquantize(s,n,sortindex,&c->binarypoint);
c->dec_index=(int *)_ogg_malloc(n*sizeof(*c->dec_index));
for(n=0,i=0;i<s->entries;i++)
if(s->lengthlist[i]>0)
c->dec_index[sortindex[n++]]=i;
c->dec_codelengths=(char *)_ogg_malloc(n*sizeof(*c->dec_codelengths));
for(n=0,i=0;i<s->entries;i++)
if(s->lengthlist[i]>0)
c->dec_codelengths[sortindex[n++]]=s->lengthlist[i];
c->dec_firsttablen=_ilog(c->used_entries)-4; /* this is magic */
if(c->dec_firsttablen<5)c->dec_firsttablen=5;
if(c->dec_firsttablen>8)c->dec_firsttablen=8;
tabn=1<<c->dec_firsttablen;
c->dec_firsttable=(ogg_uint32_t *)_ogg_calloc(tabn,sizeof(*c->dec_firsttable));
c->dec_maxlength=0;
for(i=0;i<n;i++){
if(c->dec_maxlength<c->dec_codelengths[i])
c->dec_maxlength=c->dec_codelengths[i];
if(c->dec_codelengths[i]<=c->dec_firsttablen){
ogg_uint32_t orig=bitreverse(c->codelist[i]);
for(j=0;j<(1<<(c->dec_firsttablen-c->dec_codelengths[i]));j++)
c->dec_firsttable[orig|(j<<c->dec_codelengths[i])]=i+1;
}
}
}
/* now fill in 'unused' entries in the firsttable with hi/lo search
hints for the non-direct-hits */
{
ogg_uint32_t mask=0xfffffffeUL<<(31-c->dec_firsttablen);
long lo=0,hi=0;
for(i=0;i<tabn;i++){
ogg_uint32_t word=i<<(32-c->dec_firsttablen);
if(c->dec_firsttable[bitreverse(word)]==0){
while((lo+1)<n && c->codelist[lo+1]<=word)lo++;
while( hi<n && word>=(c->codelist[hi]&mask))hi++;
/* we only actually have 15 bits per hint to play with here.
In order to overflow gracefully (nothing breaks, efficiency
just drops), encode as the difference from the extremes. */
{
unsigned long loval=lo;
unsigned long hival=n-hi;
if(loval>0x7fff)loval=0x7fff;
if(hival>0x7fff)hival=0x7fff;
c->dec_firsttable[bitreverse(word)]=
0x80000000UL | (loval<<15) | hival;
/* now fill in 'unused' entries in the firsttable with hi/lo search
hints for the non-direct-hits */
{
ogg_uint32_t mask=0xfffffffeUL<<(31-c->dec_firsttablen);
long lo=0,hi=0;
for(i=0;i<tabn;i++){
ogg_uint32_t word=i<<(32-c->dec_firsttablen);
if(c->dec_firsttable[bitreverse(word)]==0){
while((lo+1)<n && c->codelist[lo+1]<=word)lo++;
while( hi<n && word>=(c->codelist[hi]&mask))hi++;
/* we only actually have 15 bits per hint to play with here.
In order to overflow gracefully (nothing breaks, efficiency
just drops), encode as the difference from the extremes. */
{
unsigned long loval=lo;
unsigned long hival=n-hi;
if(loval>0x7fff)loval=0x7fff;
if(hival>0x7fff)hival=0x7fff;
c->dec_firsttable[bitreverse(word)]=
0x80000000UL | (loval<<15) | hival;
}
}
}
}
}
ogg_tmpmalloc_free(pos);
return(0);
err_out: