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Fixes an aliasing bug in the MDCT when the frame size isn't a multiple of 4.

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In that case, the yp0 and yp1 ended up aliasing for the last element,
despite being marked as restrict.

Signed-off-by: Jean-Marc Valin <jmvalin@jmvalin.ca>
This commit is contained in:
Marcello Caramma (mcaramma) 2014-02-24 15:06:46 -05:00 • committed by Jean-Marc Valin
parent 718b10c628
commit f17623f2f9
1 changed files with 2 additions and 2 deletions
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4
celt/mdct.c
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@ -276,8 +276,8 @@ void clt_mdct_backward(const mdct_lookup *l, kiss_fft_scalar *in, kiss_fft_scala
/* Post-rotate and de-shuffle from both ends of the buffer at once to make /* Post-rotate and de-shuffle from both ends of the buffer at once to make
it in-place. */ it in-place. */
{ {
kiss_fft_scalar * OPUS_RESTRICT yp0 = out+(overlap>>1); kiss_fft_scalar * yp0 = out+(overlap>>1);
kiss_fft_scalar * OPUS_RESTRICT yp1 = out+(overlap>>1)+N2-2; kiss_fft_scalar * yp1 = out+(overlap>>1)+N2-2;
const kiss_twiddle_scalar *t = &trig[0]; const kiss_twiddle_scalar *t = &trig[0];
/* Loop to (N4+1)>>1 to handle odd N4. When N4 is odd, the /* Loop to (N4+1)>>1 to handle odd N4. When N4 is odd, the
middle pair will be computed twice. */ middle pair will be computed twice. */