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Constrain the pitch gain to prevent potential instabilities.

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This commit is contained in:
Jean-Marc Valin 2009-10-16 23:16:47 -04:00
parent 163b02eb8e
commit d35d677543
3 changed files with 14 additions and 3 deletions
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12
libcelt/bands.c
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@ -211,7 +211,7 @@ void denormalise_bands(const CELTMode *m, const celt_norm_t * restrict X, celt_s
}
}
int compute_pitch_gain(const CELTMode *m, const celt_sig_t *X, const celt_sig_t *P, int norm_rate, int *gain_id, int _C)
int compute_pitch_gain(const CELTMode *m, const celt_sig_t *X, const celt_sig_t *P, int norm_rate, int *gain_id, int _C, celt_word16_t *gain_prod)
{
int j, c;
celt_word16_t g;
@ -281,6 +281,16 @@ int compute_pitch_gain(const CELTMode *m, const celt_sig_t *X, const celt_sig_t
*gain_id = floor(20*(g-.5));
}
#endif
/* This prevents the pitch gain from being above 1.0 for too long by bounding the
maximum error amplification factor to 2.0 */
g = ADD16(QCONST16(.5,14), MULT16_16_16(QCONST16(.05,14),*gain_id));
*gain_prod = MAX16(QCONST32(1., 13), MULT16_16_Q14(*gain_prod,g));
if (*gain_prod>QCONST32(2., 13))
{
*gain_id=9;
*gain_prod = QCONST32(2., 13);
}
if (*gain_id < 0)
{
*gain_id = 0;