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Fix CNG when effEBands is less than nbEBands.

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We were trying to normalize bands that didn't actually exist (e.g.,
 the last band with 320-sample frames at 32kHz).
Thanks to John Ridges for the report.
This commit is contained in:
Timothy B. Terriberry 2011-03-02 15:28:08 -08:00 • committed by Jean-Marc Valin
parent 168888f7a3
commit 115fa35a9d
1 changed files with 16 additions and 7 deletions
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23
libcelt/celt.c
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@ -1967,17 +1967,26 @@ static void celt_decode_lost(CELTDecoder * restrict st, celt_word16 * restrict p
log2Amp(st->mode, st->start, st->end, bandE, backgroundLogE, C);
seed = st->rng;
for (i=0;i<C*N;i++)
for (c=0;c<C;c++)
{
seed = lcg_rand(seed);
X[i] = (celt_int32)(seed)>>20;
for (i=0;i<st->mode->effEBands;i++)
{
int j;
int boffs;
int blen;
boffs = N*c+(st->mode->eBands[i]<<LM);
blen = (st->mode->eBands[i+1]-st->mode->eBands[i])<<LM;
for (j=0;j<blen;j++)
{
seed = lcg_rand(seed);
X[boffs+j] = (celt_int32)(seed)>>20;
}
renormalise_vector(X+boffs, blen, Q15ONE);
}
}
st->rng = seed;
for (c=0;c<C;c++)
for (i=0;i<st->mode->nbEBands;i++)
renormalise_vector(X+N*c+(st->mode->eBands[i]<<LM), (st->mode->eBands[i+1]-st->mode->eBands[i])<<LM, Q15ONE);
denormalise_bands(st->mode, X, freq, bandE, st->mode->nbEBands, C, 1<<LM);
denormalise_bands(st->mode, X, freq, bandE, st->mode->effEBands, C, 1<<LM);
compute_inv_mdcts(st->mode, 0, freq, out_syn, overlap_mem, C, LM);
plc = 0;