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Adding a safeguard against unstable LPC, so now there's no way (that I can

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think of) to produce NaNs in the new PLC.
This commit is contained in:
Jean-Marc Valin 2009-12-28 07:59:42 -05:00
parent d69c1cb37c
commit 07fed1bf76
1 changed files with 10 additions and 3 deletions
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13
libcelt/celt.c
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@ -1347,14 +1347,21 @@ static void celt_decode_lost(CELTDecoder * restrict st, celt_word16 * restrict p
iir(e, st->lpc, e, len+st->mode->overlap, LPC_ORDER, mem); iir(e, st->lpc, e, len+st->mode->overlap, LPC_ORDER, mem);
{ {
float ratio, S2=0; float S2=0;
for (i=0;i<len+overlap;i++) for (i=0;i<len+overlap;i++)
S2 += e[i]*1.*e[i]; S2 += e[i]*1.*e[i];
ratio = sqrt((S1+1)/(S2+1)); /* This checks for an "explosion" in the synthesis (including NaNs) */
if (ratio < 1) if (!(S1 > 0.2f*S2))
{
for (i=0;i<len+overlap;i++)
e[i] = 0;
} else if (S1 < S2)
{
float ratio = sqrt((S1+1)/(S2+1));
for (i=0;i<len+overlap;i++) for (i=0;i<len+overlap;i++)
e[i] *= ratio; e[i] *= ratio;
} }
}
for (i=0;i<MAX_PERIOD+st->mode->overlap-N;i++) for (i=0;i<MAX_PERIOD+st->mode->overlap-N;i++)
st->out_mem[C*i+c] = st->out_mem[C*(N+i)+c]; st->out_mem[C*i+c] = st->out_mem[C*(N+i)+c];