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Skipping transient shape renormalisation in the encoder because

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our search can now work on vectors that don't have unit norm
This commit is contained in:
Jean-Marc Valin 2010-04-20 17:31:45 -04:00
parent 281a63eae8
commit d6b79eeb7a
1 changed files with 8 additions and 8 deletions
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14
libcelt/celt.c
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@ -529,7 +529,9 @@ void deemphasis(celt_sig *in, celt_word16 *pcm, int N, int _C, celt_word16 coef,
}
}
static void mdct_shape(const CELTMode *mode, celt_norm *X, int start, int end, int N, int nbShortMdcts, int mdct_weight_shift, int _C)
static void mdct_shape(const CELTMode *mode, celt_norm *X, int start,
int end, int N, int nbShortMdcts,
int mdct_weight_shift, int _C, int renorm)
{
int m, i, c;
const int C = CHANNELS(_C);
@ -541,6 +543,7 @@ static void mdct_shape(const CELTMode *mode, celt_norm *X, int start, int end, i
#else
X[i] = (1.f/(1<<mdct_weight_shift))*X[i];
#endif
if (renorm)
renormalise_bands(mode, X, C);
}
@ -754,10 +757,7 @@ int celt_encode_float(CELTEncoder * restrict st, const celt_sig * pcm, celt_sig
} while (m<st->mode->nbShortMdcts-1);
#endif
if (mdct_weight_shift)
{
mdct_shape(st->mode, X, mdct_weight_pos+1, st->mode->nbShortMdcts, N, st->mode->nbShortMdcts, mdct_weight_shift, C);
renormalise_bands(st->mode, X, C);
}
mdct_shape(st->mode, X, mdct_weight_pos+1, st->mode->nbShortMdcts, N, st->mode->nbShortMdcts, mdct_weight_shift, C, 0);
}
@ -887,7 +887,7 @@ int celt_encode_float(CELTEncoder * restrict st, const celt_sig * pcm, celt_sig
if (mdct_weight_shift)
{
mdct_shape(st->mode, X, 0, mdct_weight_pos+1, N, st->mode->nbShortMdcts, mdct_weight_shift, C);
mdct_shape(st->mode, X, 0, mdct_weight_pos+1, N, st->mode->nbShortMdcts, mdct_weight_shift, C, 1);
}
/* Synthesis */
@ -1554,7 +1554,7 @@ int celt_decode_float(CELTDecoder * restrict st, const unsigned char *data, int
if (mdct_weight_shift)
{
mdct_shape(st->mode, X, 0, mdct_weight_pos+1, N, st->mode->nbShortMdcts, mdct_weight_shift, C);
mdct_shape(st->mode, X, 0, mdct_weight_pos+1, N, st->mode->nbShortMdcts, mdct_weight_shift, C, 1);
}
/* Synthesis */