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Fixed a bunch of fixed-point overflows on insanely hot signals by changing

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the time-domain representation from Q14 to Q12 (Q29 to Q27 using the
standard convention).
This commit is contained in:
Jean-Marc Valin 2008-08-28 23:34:24 -04:00
parent 8dff923a5d
commit 5c3bc67959
6 changed files with 12 additions and 14 deletions
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6
libcelt/celt.c
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@ -182,11 +182,11 @@ static int transient_analysis(celt_word32_t *in, int len, int C, int *transient_
SAVE_STACK;
ALLOC(begin, len, celt_word32_t);
for (i=0;i<len;i++)
begin[i] = EXTEND32(ABS16(SHR32(in[C*i],SIG_SHIFT)));
begin[i] = ABS32(SHR32(in[C*i],SIG_SHIFT));
for (c=1;c<C;c++)
{
for (i=0;i<len;i++)
begin[i] = MAX32(begin[i], EXTEND32(ABS16(SHR32(in[C*i+c],SIG_SHIFT))));
begin[i] = MAX32(begin[i], ABS32(SHR32(in[C*i+c],SIG_SHIFT)));
}
for (i=1;i<len;i++)
begin[i] = MAX32(begin[i-1],begin[i]);
@ -412,7 +412,7 @@ int celt_encode_float(CELTEncoder * restrict st, celt_sig_t * restrict pcm, unsi
{
/* Apply pre-emphasis */
celt_sig_t tmp = SCALEIN(SHL32(EXTEND32(*pcmp), SIG_SHIFT));
*inp = SUB32(tmp, SHR32(MULT16_16(preemph,st->preemph_memE[c]),1));
*inp = SUB32(tmp, SHR32(MULT16_16(preemph,st->preemph_memE[c]),3));
st->preemph_memE[c] = SCALEIN(*pcmp);
inp += C;
pcmp += C;