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Using a real 16-bit value for the coarse beta on intra frames

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This commit is contained in:
Jean-Marc Valin 2011-01-27 16:51:20 -05:00
parent 8ca161212b
commit 097c5be8dc
1 changed files with 9 additions and 7 deletions
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16
libcelt/quant_bands.c
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@ -66,9 +66,11 @@ static const celt_word16 eMeans[25] = {
#ifdef FIXED_POINT #ifdef FIXED_POINT
static const celt_word16 pred_coef[4] = {29440, 26112, 21248, 16384}; static const celt_word16 pred_coef[4] = {29440, 26112, 21248, 16384};
static const celt_word16 beta_coef[4] = {30147, 22282, 12124, 6554}; static const celt_word16 beta_coef[4] = {30147, 22282, 12124, 6554};
static const celt_word16 beta_intra = 4915;
#else #else
static const celt_word16 pred_coef[4] = {29440/32768., 26112/32768., 21248/32768., 16384/32768.}; static const celt_word16 pred_coef[4] = {29440/32768., 26112/32768., 21248/32768., 16384/32768.};
static const celt_word16 beta_coef[4] = {30147/32768., 22282/32768., 12124/32768., 6554/32768.}; static const celt_word16 beta_coef[4] = {30147/32768., 22282/32768., 12124/32768., 6554/32768.};
static const celt_word16 beta_intra = 4915/32768.;
#endif #endif
/*Parameters of the Laplace-like probability models used for the coarse energy. /*Parameters of the Laplace-like probability models used for the coarse energy.
@ -173,7 +175,7 @@ static int quant_coarse_energy_impl(const CELTMode *m, int start, int end,
if (intra) if (intra)
{ {
coef = 0; coef = 0;
beta = QCONST16(.15f,15); beta = beta_intra;
} else { } else {
beta = beta_coef[LM]; beta = beta_coef[LM];
coef = pred_coef[LM]; coef = pred_coef[LM];
@ -289,7 +291,7 @@ void quant_coarse_energy(const CELTMode *m, int start, int end, int effEnd,
(first symbols in the stream) */ (first symbols in the stream) */
#ifdef FIXED_POINT #ifdef FIXED_POINT
max_decay = MIN32(QCONST16(16,DB_SHIFT), SHL32(EXTEND32(nbAvailableBytes),DB_SHIFT-3)); max_decay = MIN32(QCONST16(16.f,DB_SHIFT), SHL32(EXTEND32(nbAvailableBytes),DB_SHIFT-3));
#else #else
max_decay = MIN32(16.f, .125f*nbAvailableBytes); max_decay = MIN32(16.f, .125f*nbAvailableBytes);
#endif #endif
@ -380,7 +382,7 @@ void quant_fine_energy(const CELTMode *m, int start, int end, celt_word16 *oldEB
q2 = 0; q2 = 0;
ec_enc_bits(enc, q2, fine_quant[i]); ec_enc_bits(enc, q2, fine_quant[i]);
#ifdef FIXED_POINT #ifdef FIXED_POINT
offset = SUB16(SHR32(SHL32(EXTEND32(q2),DB_SHIFT)+QCONST16(.5,DB_SHIFT),fine_quant[i]),QCONST16(.5f,DB_SHIFT)); offset = SUB16(SHR32(SHL32(EXTEND32(q2),DB_SHIFT)+QCONST16(.5f,DB_SHIFT),fine_quant[i]),QCONST16(.5f,DB_SHIFT));
#else #else
offset = (q2+.5f)*(1<<(14-fine_quant[i]))*(1.f/16384) - .5f; offset = (q2+.5f)*(1<<(14-fine_quant[i]))*(1.f/16384) - .5f;
#endif #endif
@ -410,7 +412,7 @@ void quant_energy_finalise(const CELTMode *m, int start, int end, celt_word16 *o
q2 = error[i+c*m->nbEBands]<0 ? 0 : 1; q2 = error[i+c*m->nbEBands]<0 ? 0 : 1;
ec_enc_bits(enc, q2, 1); ec_enc_bits(enc, q2, 1);
#ifdef FIXED_POINT #ifdef FIXED_POINT
offset = SHR16(SHL16(q2,DB_SHIFT)-QCONST16(.5,DB_SHIFT),fine_quant[i]+1); offset = SHR16(SHL16(q2,DB_SHIFT)-QCONST16(.5f,DB_SHIFT),fine_quant[i]+1);
#else #else
offset = (q2-.5f)*(1<<(14-fine_quant[i]-1))*(1.f/16384); offset = (q2-.5f)*(1<<(14-fine_quant[i]-1))*(1.f/16384);
#endif #endif
@ -436,7 +438,7 @@ void unquant_coarse_energy(const CELTMode *m, int start, int end, celt_word16 *o
if (intra) if (intra)
{ {
coef = 0; coef = 0;
beta = QCONST16(.15f,15); beta = beta_intra;
} else { } else {
beta = beta_coef[LM]; beta = beta_coef[LM];
coef = pred_coef[LM]; coef = pred_coef[LM];
@ -499,7 +501,7 @@ void unquant_fine_energy(const CELTMode *m, int start, int end, celt_word16 *old
celt_word16 offset; celt_word16 offset;
q2 = ec_dec_bits(dec, fine_quant[i]); q2 = ec_dec_bits(dec, fine_quant[i]);
#ifdef FIXED_POINT #ifdef FIXED_POINT
offset = SUB16(SHR32(SHL32(EXTEND32(q2),DB_SHIFT)+QCONST16(.5,DB_SHIFT),fine_quant[i]),QCONST16(.5f,DB_SHIFT)); offset = SUB16(SHR32(SHL32(EXTEND32(q2),DB_SHIFT)+QCONST16(.5f,DB_SHIFT),fine_quant[i]),QCONST16(.5f,DB_SHIFT));
#else #else
offset = (q2+.5f)*(1<<(14-fine_quant[i]))*(1.f/16384) - .5f; offset = (q2+.5f)*(1<<(14-fine_quant[i]))*(1.f/16384) - .5f;
#endif #endif
@ -526,7 +528,7 @@ void unquant_energy_finalise(const CELTMode *m, int start, int end, celt_word16
celt_word16 offset; celt_word16 offset;
q2 = ec_dec_bits(dec, 1); q2 = ec_dec_bits(dec, 1);
#ifdef FIXED_POINT #ifdef FIXED_POINT
offset = SHR16(SHL16(q2,DB_SHIFT)-QCONST16(.5,DB_SHIFT),fine_quant[i]+1); offset = SHR16(SHL16(q2,DB_SHIFT)-QCONST16(.5f,DB_SHIFT),fine_quant[i]+1);
#else #else
offset = (q2-.5f)*(1<<(14-fine_quant[i]-1))*(1.f/16384); offset = (q2-.5f)*(1<<(14-fine_quant[i]-1))*(1.f/16384);
#endif #endif