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Don't allow empty eBands.

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Currently compute_ebands()'s attempts to round bands to even sizes
 and enforce size constraints on consecutive bands can leave some
 bands entirely empty (e.g., Fs=8000, frame_size=64, i=11).
This adds a simple post-processing loop to remove such bands.
This commit is contained in:
Timothy B. Terriberry 2011-02-01 12:32:34 -08:00 • committed by Jean-Marc Valin
parent 7bb26e13ca
commit cb8f366af6
1 changed files with 7 additions and 1 deletions
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8
libcelt/modes.c
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@ -133,7 +133,7 @@ static const celt_int16 bark_freq[BARK_BANDS+1] = {
static celt_int16 *compute_ebands(celt_int32 Fs, int frame_size, int res, int *nbEBands)
{
celt_int16 *eBands;
int i, lin, low, high, nBark, offset=0;
int i, j, lin, low, high, nBark, offset=0;
/* All modes that have 2.5 ms short blocks use the same definition */
if (Fs == 400*(celt_int32)frame_size)
@ -190,6 +190,12 @@ static celt_int16 *compute_ebands(celt_int32 Fs, int frame_size, int res, int *n
eBands[i] -= (2*eBands[i]-eBands[i-1]-eBands[i+1])/2;
}
}
/* Remove any empty bands. */
for (i=j=0;i<*nbEBands;i++)
if(eBands[i+1]>eBands[j])
eBands[++j]=eBands[i+1];
*nbEBands=j;
/*for (i=0;i<=*nbEBands+1;i++)
printf ("%d ", eBands[i]);
printf ("\n");