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Fixed a bunch of fixed-point overflows on insanely hot signals by changing

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the time-domain representation from Q14 to Q12 (Q29 to Q27 using the
standard convention).
This commit is contained in:
Jean-Marc Valin 2008-08-28 23:34:24 -04:00
parent 8dff923a5d
commit 5c3bc67959
6 changed files with 12 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

2
configure.ac
View file

@ -6,7 +6,7 @@ AM_CONFIG_HEADER([config.h])
CELT_MAJOR_VERSION=0
CELT_MINOR_VERSION=4
CELT_MICRO_VERSION=0
CELT_MICRO_VERSION=1
CELT_EXTRA_VERSION=
CELT_VERSION=$CELT_MAJOR_VERSION.$CELT_MINOR_VERSION.$CELT_MICRO_VERSION$CELT_EXTRA_VERSION

6
libcelt/arch.h
View file

@ -71,9 +71,7 @@ typedef celt_word32_t celt_mask_t;
#define Q15ONE 32767
#define Q30ONE 1073741823
#define SIG_SCALING 16384.f
#define SIG_SCALING_1 (1.f/16384.f)
#define SIG_SHIFT 14
#define SIG_SHIFT 12
#define NORM_SCALING 16384
#define NORM_SCALING_1 (1.f/16384.f)
@ -135,8 +133,6 @@ typedef float celt_mask_t;
#define Q15ONE 1.0f
#define Q30ONE 1.0f
#define SIG_SCALING 1.f
#define SIG_SCALING_1 1.f
#define NORM_SCALING 1.f
#define NORM_SCALING_1 1.f
#define ENER_SCALING 1.f

4
libcelt/bands.c
View file

@ -175,9 +175,9 @@ void denormalise_bands(const CELTMode *m, const celt_norm_t * restrict X, celt_s
for (i=0;i<m->nbEBands;i++)
{
int j;
celt_word32_t g = MULT16_32_Q13(sqrtC_1[C-1],bank[i*C+c]);
celt_word32_t g = MULT16_32_Q15(sqrtC_1[C-1],bank[i*C+c]);
j=eBands[i]; do {
freq[j*C+c] = MULT16_32_Q15(X[j*C+c], g);
freq[j*C+c] = SHL32(MULT16_32_Q15(X[j*C+c], g),2);
} while (++j<eBands[i+1]);
}
}

6
libcelt/celt.c
View file

@ -182,11 +182,11 @@ static int transient_analysis(celt_word32_t *in, int len, int C, int *transient_
SAVE_STACK;
ALLOC(begin, len, celt_word32_t);
for (i=0;i<len;i++)
begin[i] = EXTEND32(ABS16(SHR32(in[C*i],SIG_SHIFT)));
begin[i] = ABS32(SHR32(in[C*i],SIG_SHIFT));
for (c=1;c<C;c++)
{
for (i=0;i<len;i++)
begin[i] = MAX32(begin[i], EXTEND32(ABS16(SHR32(in[C*i+c],SIG_SHIFT))));
begin[i] = MAX32(begin[i], ABS32(SHR32(in[C*i+c],SIG_SHIFT)));
}
for (i=1;i<len;i++)
begin[i] = MAX32(begin[i-1],begin[i]);
@ -412,7 +412,7 @@ int celt_encode_float(CELTEncoder * restrict st, celt_sig_t * restrict pcm, unsi
{
/* Apply pre-emphasis */
celt_sig_t tmp = SCALEIN(SHL32(EXTEND32(*pcmp), SIG_SHIFT));
*inp = SUB32(tmp, SHR32(MULT16_16(preemph,st->preemph_memE[c]),1));
*inp = SUB32(tmp, SHR32(MULT16_16(preemph,st->preemph_memE[c]),3));
st->preemph_memE[c] = SCALEIN(*pcmp);
inp += C;
pcmp += C;

2
libcelt/mathops.h
View file

@ -246,7 +246,7 @@ static inline celt_word32_t celt_exp2(celt_word16_t x)
celt_word16_t frac;
integer = SHR16(x,11);
if (integer>14)
return 0x7fffffff;
return 0x7f000000;
else if (integer < -15)
return 0;
frac = SHL16(x-SHL16(integer,11),3);

6
libcelt/quant_bands.c
View file

@ -52,17 +52,19 @@ const celt_word16_t eMeans[24] = {45.f, -8.f, -12.f, -2.5f, 1.f, 0.f, 0.f, 0.f,
static inline celt_ener_t dB2Amp(celt_ener_t dB)
{
celt_ener_t amp;
if (dB>24659)
dB=24659;
amp = PSHR32(celt_exp2(MULT16_16_Q14(21771,dB)),2)-QCONST16(.3f, 14);
if (amp < 0)
amp = 0;
return amp;
return PSHR32(amp,2);
}
#define DBofTWO 24661
static inline celt_word16_t amp2dB(celt_ener_t amp)
{
/* equivalent to return 6.0207*log2(.3+amp) */
return ROUND16(MULT16_16(24661,celt_log2(ADD32(QCONST32(.3f,14),amp))),12);
return ROUND16(MULT16_16(24661,celt_log2(ADD32(QCONST32(.3f,14),SHL32(amp,2)))),12);
/* return DB_SCALING*20*log10(.3+ENER_SCALING_1*amp); */
}
#else