mirror of
https://github.com/mpv-player/mpv
synced 2024-12-22 06:42:03 +00:00
fc91fed21e
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14281 b3059339-0415-0410-9bf9-f77b7e298cf2
348 lines
9.1 KiB
C
348 lines
9.1 KiB
C
/********************************************************************
|
|
* *
|
|
* THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
|
|
* *
|
|
* THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002 *
|
|
* BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
|
|
* ALL REDISTRIBUTION RIGHTS RESERVED. *
|
|
* *
|
|
********************************************************************
|
|
|
|
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"
|
|
#include "os.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);
|
|
}
|
|
|
|
static inline 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)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);
|
|
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){
|
|
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(packed_entry);
|
|
}
|
|
|
|
/* 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){
|
|
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){
|
|
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){
|
|
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_decodevv_add(codebook *book,ogg_int32_t **a,\
|
|
long offset,int ch,
|
|
oggpack_buffer *b,int n,int point){
|
|
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);
|
|
}
|