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fixed-point: more energy quantisation stuff.

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This commit is contained in:
Jean-Marc Valin 2008-02-29 00:15:10 +11:00
parent 47bf175f29
commit adf87e261c
1 changed files with 6 additions and 15 deletions
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21
libcelt/quant_bands.c
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@ -43,7 +43,7 @@
#ifdef FIXED_POINT
const celt_word16_t eMeans[24] = {11520, -2048, -3072, -640, 256, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
#else
const float eMeans[24] = {45.f, -8.f, -12.f, -2.5f, 1.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f};
const celt_word16_t eMeans[24] = {45.f, -8.f, -12.f, -2.5f, 1.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f};
#endif
/*const int frac[24] = {4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2};*/
@ -83,13 +83,6 @@ static inline celt_word16_t amp2dB(celt_ener_t amp)
static const celt_word16_t base_resolution = QCONST16(6.f,8);
#ifdef FIXED_POINT
#define Q8 256.f
#define Q8_1 (1.f/256.f)
#else
#define Q8 1.f
#define Q8_1 1.f
#endif
static void quant_energy_mono(const CELTMode *m, celt_ener_t *eBands, celt_word16_t *oldEBands, int budget, ec_enc *enc)
{
int i;
@ -148,12 +141,12 @@ static void quant_energy_mono(const CELTMode *m, celt_ener_t *eBands, celt_word1
/* Has to be without rounding */
q2 = offset>>8;
#else
q2 = (int)floor(Q8_1*offset);
q2 = (int)floor(offset);
#endif
if (q2 > frac[i]-1)
q2 = frac[i]-1;
ec_enc_uint(enc, q2, frac[i]);
offset = (Q8*(q2+.5)/frac[i])-QCONST16(.5f,8);
offset = DIV32_16(SHL16(q2,8)+QCONST16(.5,8),frac[i])-QCONST16(.5f,8);
oldEBands[i] += PSHR32(MULT16_16(DB_SCALING*6,offset),8);
/*printf ("%f ", error[i] - offset);*/
}
@ -202,7 +195,7 @@ static void unquant_energy_mono(const CELTMode *m, celt_ener_t *eBands, celt_wor
if (ec_dec_tell(dec, 0) - bits +EC_ILOG(frac[i])> budget)
break;
q2 = ec_dec_uint(dec, frac[i]);
offset = (Q8*(q2+.5)/frac[i])-QCONST16(.5f,8);
offset = DIV32_16(SHL16(q2,8)+QCONST16(.5,8),frac[i])-QCONST16(.5f,8);
oldEBands[i] += PSHR32(MULT16_16(DB_SCALING*6,offset),8);
}
for (i=0;i<m->nbEBands;i++)
@ -243,10 +236,8 @@ void quant_energy(const CELTMode *m, celt_ener_t *eBands, celt_word16_t *oldEBan
{
int i;
int NB = m->nbEBands;
float mid[NB];
float side[NB];
float left;
float right;
celt_ener_t mid[NB];
celt_ener_t side[NB];
for (i=0;i<NB;i++)
{
//left = eBands[C*i];