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Using the actual degrees of freedom rather than N*C for fine offset

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This commit is contained in:
Jean-Marc Valin 2011-01-28 20:56:56 -05:00
parent 420c325875
commit 17cab431db
1 changed files with 4 additions and 4 deletions
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8
libcelt/rate.c
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@ -339,18 +339,18 @@ static inline int interp_bits2pulses(const CELTMode *m, int start, int end, int
if (N>1)
{
NClogN = N*C*(m->logN[j] + logM);
/* Compensate for the extra DoF in stereo */
den=(C*N+ ((C==2 && N>2) ? 1 : 0));
NClogN = den*(m->logN[j] + logM);
/* Offset for the number of fine bits by log2(N)/2 + FINE_OFFSET
compared to their "fair share" of total/N */
offset = (NClogN>>1)-N*C*FINE_OFFSET;
offset = (NClogN>>1)-den*FINE_OFFSET;
/* N=2 is the only point that doesn't match the curve */
if (N==2)
offset += N*C<<BITRES>>2;
offset += den<<BITRES>>2;
/* Changing the offset for allocating the second and third
fine energy bit */