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fixed-point: fixing two overflows that didn't really affect quality

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This commit is contained in:
Jean-Marc Valin 2009-07-01 09:59:21 -04:00
parent 7c422653f3
commit cd29b02773
3 changed files with 16 additions and 6 deletions
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2
libcelt/bands.c
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@ -233,6 +233,8 @@ int compute_pitch_gain(const CELTMode *m, const celt_norm_t *X, const celt_norm_
Sxy = MAC16_16(Sxy, X[j], P[j]); Sxy = MAC16_16(Sxy, X[j], P[j]);
Sxx = MAC16_16(Sxx, X[j], X[j]); Sxx = MAC16_16(Sxx, X[j], X[j]);
} }
Sxy = SHR32(Sxy,2);
Sxx = SHR32(Sxx,2);
/* No negative gain allowed */ /* No negative gain allowed */
if (Sxy < 0) if (Sxy < 0)
Sxy = 0; Sxy = 0;

10
libcelt/fixed_debug.h
View file

@ -427,18 +427,20 @@ static inline short MULT16_16_Q14(int a, int b)
celt_mips+=3; celt_mips+=3;
return res; return res;
} }
static inline short MULT16_16_Q15(int a, int b)
#define MULT16_16_Q15(a, b) _MULT16_16_Q15(a, b, __FILE__, __LINE__)
static inline short _MULT16_16_Q15(int a, int b, char *file, int line)
{ {
long long res; long long res;
if (!VERIFY_SHORT(a) || !VERIFY_SHORT(b)) if (!VERIFY_SHORT(a) || !VERIFY_SHORT(b))
{ {
fprintf (stderr, "MULT16_16_Q15: inputs are not short: %d %d\n", a, b); fprintf (stderr, "MULT16_16_Q15: inputs are not short: %d %d in %s: line %d\n", a, b, file, line);
} }
res = ((long long)a)*b; res = ((long long)a)*b;
res >>= 15; res >>= 15;
if (!VERIFY_SHORT(res)) if (!VERIFY_SHORT(res))
{ {
fprintf (stderr, "MULT16_16_Q15: output is not short: %d\n", (int)res); fprintf (stderr, "MULT16_16_Q15: output is not short: %d in %s: line %d\n", (int)res, file, line);
} }
celt_mips+=1; celt_mips+=1;
return res; return res;
@ -547,6 +549,6 @@ static inline int _DIV32(long long a, long long b, char *file, int line)
#define PDIV32_16(a,b) DIV32_16(ADD32((a),(b)>>1),b) #define PDIV32_16(a,b) DIV32_16(ADD32((a),(b)>>1),b)
#undef PRINT_MIPS #undef PRINT_MIPS
#define PRINT_MIPS(file) do {fprintf (file, "total complexity = %d MIPS\n", celt_mips);} while (0); #define PRINT_MIPS(file) do {fprintf (file, "total complexity = %llu MIPS\n", celt_mips);} while (0);
#endif #endif

10
libcelt/vq.c
View file

@ -335,7 +335,14 @@ celt_word16_t renormalise_vector(celt_norm_t *X, celt_word16_t value, int N, int
} }
rE = celt_sqrt(E); rE = celt_sqrt(E);
g = MULT16_16_Q15(value,celt_rcp(SHL32(rE,9))); /*if (celt_rcp(SHL32(rE,9))>32767)
fprintf (stderr, "celt_rcp: %d %d\n",rE, E); */
#ifdef FIXED_POINT
if (rE <= 128)
g = Q15ONE;
else
#endif
g = MULT16_16_Q15(value,celt_rcp(SHL32(rE,9)));
xptr = X; xptr = X;
for (i=0;i<N;i++) for (i=0;i<N;i++)
{ {
@ -374,7 +381,6 @@ void intra_fold(const CELTMode *m, celt_norm_t * restrict x, int N, int K, celt_
pred_gain = celt_div((celt_word32_t)MULT16_16(Q15_ONE,N),(celt_word32_t)(N+KGAIN*K)); pred_gain = celt_div((celt_word32_t)MULT16_16(Q15_ONE,N),(celt_word32_t)(N+KGAIN*K));
fold(m, N, Y, P, N0, B); fold(m, N, Y, P, N0, B);
renormalise_vector(P, pred_gain, C*N, 1); renormalise_vector(P, pred_gain, C*N, 1);
} }