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Vorbis optimizations: allocation of PCM buffers in IRAM, avoiding copying.

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Slight code improvements to the MDCT functions.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6590 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Pedro Vasconcelos 2005-06-06 23:01:51 +00:00
parent 127f14210f
commit 0f10e898f0
11 changed files with 110 additions and 132 deletions
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13
apps/codecs/Tremor/codebook.c
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@ -140,7 +140,7 @@ int vorbis_staticbook_unpack(oggpack_buffer *opb,static_codebook *s){
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){
static inline ogg_uint32_t bitreverse(register 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);
@ -265,12 +265,13 @@ long vorbis_book_decodev_add(codebook *book,ogg_int32_t *a,
a[i++]+=t[j++]>>shift;
}
}else{
shift = -shift;
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;
a[i++]+=t[j++]<<shift;
}
}
return(0);
@ -293,13 +294,13 @@ long vorbis_book_decodev_set(codebook *book,ogg_int32_t *a,
}
}
}else{
shift = -shift;
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;
a[i++]=t[j++]<<shift;
}
}
}
@ -330,14 +331,14 @@ long vorbis_book_decodevv_add(codebook *book,ogg_int32_t **a,
}
}
}else{
shift = -shift;
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;
a[chptr++][i]+=t[j]<<shift;
if(chptr==ch){
chptr=0;
i++;