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Basic optimizations of the Vorbis decoder for the ihp-1x0.

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Capable of real-time decoding with cpu freq at 120mhz.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6527 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Pedro Vasconcelos 2005-05-27 09:14:00 +00:00
parent 3841348930
commit 024db0a766
22 changed files with 428 additions and 107 deletions
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12
apps/codecs/Tremor/window.c
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@ -56,7 +56,6 @@ const void *_vorbis_window(int type, int left){
void _vorbis_apply_window(ogg_int32_t *d,const void *window_p[2],
long *blocksizes,
int lW,int W,int nW){
LOOKUP_T *window[2]={window_p[0],window_p[1]};
long n=blocksizes[W];
long ln=blocksizes[lW];
@ -67,7 +66,14 @@ void _vorbis_apply_window(ogg_int32_t *d,const void *window_p[2],
long rightbegin=n/2+n/4-rn/4;
long rightend=rightbegin+rn/2;
#if CONFIG_CPU == MCF5249
mcf5249_init_mac(); /* shouldn't be needed, but just in case */
mcf5249_vect_zero(&d[0], leftbegin);
mcf5249_vect_mult_fw(&d[leftbegin], &window[lW][0], leftend-leftbegin);
mcf5249_vect_mult_bw(&d[rightbegin], &window[nW][rn/2-1], rightend-rightbegin);
mcf5249_vect_zero(&d[rightend], n-rightend);
#else
int i,p;
for(i=0;i<leftbegin;i++)
@ -81,4 +87,6 @@ void _vorbis_apply_window(ogg_int32_t *d,const void *window_p[2],
for(;i<n;i++)
d[i]=0;
#endif
}