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fixed-point: changed find_spectral_pitch() to use single-precision (16-bit) FFT.

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This involved adding kfft_single.[ch] that redefines kiss_fft a second time
with a different prefix. All this is still a bit of a mess now. The mask
had to be converted to 16-bit input, but we're still using floats to apply it.
This commit is contained in:
Jean-Marc Valin 2008-03-05 17:20:30 +11:00
parent 4024444811
commit f93747c44a
12 changed files with 166 additions and 28 deletions
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8
libcelt/psy.c
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@ -126,7 +126,7 @@ static void spreading_func(struct PsyDecay *d, celt_word32_t *psd, celt_mask_t *
}
/* Compute a marking threshold from the spectrum X. */
void compute_masking(struct PsyDecay *decay, celt_word32_t *X, celt_mask_t *mask, int len)
void compute_masking(struct PsyDecay *decay, celt_word16_t *X, celt_mask_t *mask, int len)
{
int i;
VARDECL(celt_word32_t *psd);
@ -134,10 +134,10 @@ void compute_masking(struct PsyDecay *decay, celt_word32_t *X, celt_mask_t *mask
SAVE_STACK;
N=len/2;
ALLOC(psd, N, celt_word32_t);
psd[0] = MULT16_16(ROUND(X[0],SIG_SHIFT), ROUND(X[0],SIG_SHIFT));
psd[0] = MULT16_16(X[0], X[0]);
for (i=1;i<N;i++)
psd[i] = ADD32(MULT16_16(ROUND(X[i*2],SIG_SHIFT), ROUND(X[i*2],SIG_SHIFT)),
MULT16_16(ROUND(X[i*2+1],SIG_SHIFT), ROUND(X[i*2+1],SIG_SHIFT)));
psd[i] = ADD32(MULT16_16(X[i*2], X[i*2]),
MULT16_16(X[i*2+1], X[i*2+1]));
/* TODO: Do tone masking */
/* Noise masking */
spreading_func(decay, psd, mask, N);