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Disabling pitch when gain is very small.

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This commit is contained in:
Jean-Marc Valin 2008-04-21 15:08:57 +10:00
parent 431e46469c
commit 2146e649c8
2 changed files with 12 additions and 2 deletions
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2
libcelt/celt.c
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@ -346,7 +346,7 @@ int EXPORT celt_encode(CELTEncoder * restrict st, celt_int16_t * restrict pcm, u
/* No pitch, so we just pretend we found a gain of zero */
for (i=0;i<st->mode->nbPBands;i++)
gains[i] = 0;
ec_enc_uint(&st->enc, 0, 128);
ec_enc_bits(&st->enc, 0, 7);
for (i=0;i<C*N;i++)
P[i] = 0;
}

10
libcelt/quant_pitch.c
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@ -95,11 +95,21 @@ static void id2gains(int id, celt_pgain_t *gains, int len)
int quant_pitch(celt_pgain_t *gains, int len, ec_enc *enc)
{
int i, id;
celt_word32_t gain_sum = 0;
/*for (i=0;i<len;i++) printf ("%f ", gains[i]);printf ("\n");*/
/* Convert to a representation where the MSE criterion should be near-optimal */
for (i=0;i<len;i++)
{
gains[i] = SHR16(Q15ONE-celt_sqrt(Q1515ONE-MULT16_16(gains[i],gains[i])),1);
gain_sum = ADD32(gain_sum, EXTEND32(gains[i]));
}
/* Is it worth encoding the pitch? */
if (gain_sum > QCONST32(.3f,15))
{
id = vq_index(gains, pgain_table, len, 128);
} else {
id = 0;
}
ec_enc_bits(enc, id, 7);
/*for (i=0;i<len;i++) printf ("%f ", pgain_table[id*len+i]);printf ("\n");*/
id2gains(id, gains, len);