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FS #7833: Optimizations to the Vorbis codec:

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- ARM assembly version of parts of mdct,
- special case for vorbis_book_decodevv_add for 2 channels and even book->dim,
- store the output in vb->pcm if possible, as it is usually in IRAM as
  opposed to v->pcm.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14875 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Tomasz Malesinski 2007-09-27 21:58:51 +00:00
parent 1aaf5dbdb6
commit c13eba29ff
6 changed files with 502 additions and 10 deletions
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54
apps/codecs/Tremor/codebook.c
View file

@ -199,7 +199,7 @@ STIN long decode_packed_entry_number(codebook *book,
return(-1);
}
static inline long decode_packed_block(codebook *book, oggpack_buffer *b,
static long decode_packed_block(codebook *book, oggpack_buffer *b,
long *buf, int n){
long *bufptr = buf;
long *bufend = buf + n;
@ -399,6 +399,55 @@ long vorbis_book_decodev_set(codebook *book,ogg_int32_t *a,
return(0);
}
static long vorbis_book_decodevv_add_2ch_even(codebook *book,ogg_int32_t **a,
long offset,oggpack_buffer *b,
int n,int point){
long i,k,chunk,read;
int shift=point-book->binarypoint;
long entries[32];
ogg_int32_t *p0 = &(a[0][offset]);
ogg_int32_t *p1 = &(a[1][offset]);
if(shift>=0){
for(i=0;i<n;){
chunk=32;
if (chunk*book->dim>(n-i)*2)
chunk=((n-i)*2+book->dim-1)/book->dim;
read = decode_packed_block(book,b,entries,chunk);
for(k=0;k<read;k++){
const ogg_int32_t *t = book->valuelist+entries[k]*book->dim;
const ogg_int32_t *u = t+book->dim;
do{
*p0++ += *t++>>shift;
*p1++ += *t++>>shift;
}while(t<u);
}
if (read<chunk)return-1;
i += read*book->dim/2;
}
}else{
shift = -shift;
for(i=0;i<n;){
chunk=32;
if (chunk*book->dim>(n-i)*2)
chunk=((n-i)*2+book->dim-1)/book->dim;
read = decode_packed_block(book,b,entries,chunk);
for(k=0;k<read;k++){
const ogg_int32_t *t = book->valuelist+entries[k]*book->dim;
const ogg_int32_t *u = t+book->dim;
do{
*p0++ += *t++<<shift;
*p1++ += *t++<<shift;
}while(t<u);
}
if (read<chunk)return-1;
i += read*book->dim/2;
}
}
return(0);
}
long vorbis_book_decodevv_add(codebook *book,ogg_int32_t **a,
long offset,int ch,
oggpack_buffer *b,int n,int point){
@ -408,6 +457,9 @@ long vorbis_book_decodevv_add(codebook *book,ogg_int32_t **a,
int shift=point-book->binarypoint;
long entries[32];
if (!(book->dim&1) && ch==2)
return vorbis_book_decodevv_add_2ch_even(book,a,offset,b,n,point);
if(shift>=0){
for(i=offset;i<offset+n;){