eden-emu/opus
17
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Add assertions for band size restrictions.

Browse source 
The way folding is implemented requires two restrictions:
1. The last band must be the largest (so we can use its size to
 allocate a temporary buffer to handle interleaving/TF changes).
2. No band can be larger than twice the size of the previous band
 (so that once we have enough data to start folding, we will always
 have enough data to fold).

Mode creation makes a heuristic attempt to satisfy these
 conditions, but nothing actually guarantees it.
This adds some asserts to check them during mode creation.
They current pass for all supported custom modes.
This commit is contained in:
Timothy B. Terriberry 2011-02-01 12:53:05 -08:00 • committed by Jean-Marc Valin
parent cb8f366af6
commit 2799c29792
1 changed files with 8 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

8
libcelt/modes.c
View file

@ -196,6 +196,14 @@ static celt_int16 *compute_ebands(celt_int32 Fs, int frame_size, int res, int *n
eBands[++j]=eBands[i+1];
*nbEBands=j;
for (i=1;i<*nbEBands;i++)
{
/* Every band must be smaller than the last band. */
celt_assert(eBands[i]-eBands[i-1]<=eBands[*nbEBands]-eBands[*nbEBands-1]);
/* Each band must be no larger than twice the size of the previous one. */
celt_assert(eBands[i+1]-eBands[i]<=2*(eBands[i]-eBands[i-1]));
}
/*for (i=0;i<=*nbEBands+1;i++)
printf ("%d ", eBands[i]);
printf ("\n");