/**************************************************************/
/* Compute noise shaping coefficients and initial gain values */
/**************************************************************/
internal static void silk_noise_shape_analysis(
SilkChannelEncoder psEnc, /* I/O Encoder state FIX */
SilkEncoderControl psEncCtrl, /* I/O Encoder control FIX */
short[] pitch_res, /* I LPC residual from pitch analysis */
int pitch_res_ptr,
short[] x, /* I Input signal [ frame_length + la_shape ] */
int x_ptr
)
{
SilkShapeState psShapeSt = psEnc.sShape;
int k, i, nSamples, Qnrg, b_Q14, warping_Q16, scale = 0;
int SNR_adj_dB_Q7, HarmBoost_Q16, HarmShapeGain_Q16, Tilt_Q16, tmp32;
int nrg, pre_nrg_Q30, log_energy_Q7, log_energy_prev_Q7, energy_variation_Q7;
int delta_Q16, BWExp1_Q16, BWExp2_Q16, gain_mult_Q16, gain_add_Q16, strength_Q16, b_Q8;
int[] auto_corr = new int[SilkConstants.MAX_SHAPE_LPC_ORDER + 1];
int[] refl_coef_Q16 = new int[SilkConstants.MAX_SHAPE_LPC_ORDER];
int[] AR1_Q24 = new int[SilkConstants.MAX_SHAPE_LPC_ORDER];
int[] AR2_Q24 = new int[SilkConstants.MAX_SHAPE_LPC_ORDER];
short[] x_windowed;
int pitch_res_ptr2;
int x_ptr2;
/* Point to start of first LPC analysis block */
x_ptr2 = x_ptr - psEnc.la_shape;
/****************/
/* GAIN CONTROL */
/****************/
SNR_adj_dB_Q7 = psEnc.SNR_dB_Q7;
/* Input quality is the average of the quality in the lowest two VAD bands */
psEncCtrl.input_quality_Q14 = (int)Inlines.silk_RSHIFT((int)psEnc.input_quality_bands_Q15[0]
+ psEnc.input_quality_bands_Q15[1], 2);
/* Coding quality level, between 0.0_Q0 and 1.0_Q0, but in Q14 */
psEncCtrl.coding_quality_Q14 = Inlines.silk_RSHIFT(Sigmoid.silk_sigm_Q15(Inlines.silk_RSHIFT_ROUND(SNR_adj_dB_Q7 -
((int)((20.0f) * ((long)1 << (7)) + 0.5)) /*Inlines.SILK_CONST(20.0f, 7)*/, 4)), 1);
/* Reduce coding SNR during low speech activity */
if (psEnc.useCBR == 0)
{
b_Q8 = ((int)((1.0f) * ((long)1 << (8)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 8)*/ - psEnc.speech_activity_Q8;
b_Q8 = Inlines.silk_SMULWB(Inlines.silk_LSHIFT(b_Q8, 8), b_Q8);
SNR_adj_dB_Q7 = Inlines.silk_SMLAWB(SNR_adj_dB_Q7,
Inlines.silk_SMULBB(((int)((0 - TuningParameters.BG_SNR_DECR_dB) * ((long)1 << (7)) + 0.5)) /*Inlines.SILK_CONST(0 - TuningParameters.BG_SNR_DECR_dB, 7)*/ >> (4 + 1), b_Q8), /* Q11*/
Inlines.silk_SMULWB(((int)((1.0f) * ((long)1 << (14)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 14)*/ + psEncCtrl.input_quality_Q14, psEncCtrl.coding_quality_Q14)); /* Q12*/
}
if (psEnc.indices.signalType == SilkConstants.TYPE_VOICED)
{
/* Reduce gains for periodic signals */
SNR_adj_dB_Q7 = Inlines.silk_SMLAWB(SNR_adj_dB_Q7, ((int)((TuningParameters.HARM_SNR_INCR_dB) * ((long)1 << (8)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.HARM_SNR_INCR_dB, 8)*/, psEnc.LTPCorr_Q15);
}
else
{
/* For unvoiced signals and low-quality input, adjust the quality slower than SNR_dB setting */
SNR_adj_dB_Q7 = Inlines.silk_SMLAWB(SNR_adj_dB_Q7,
Inlines.silk_SMLAWB(((int)((6.0f) * ((long)1 << (9)) + 0.5)) /*Inlines.SILK_CONST(6.0f, 9)*/, -((int)((0.4f) * ((long)1 << (18)) + 0.5)) /*Inlines.SILK_CONST(0.4f, 18)*/, psEnc.SNR_dB_Q7),
((int)((1.0f) * ((long)1 << (14)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 14)*/ - psEncCtrl.input_quality_Q14);
}
/*************************/
/* SPARSENESS PROCESSING */
/*************************/
/* Set quantizer offset */
if (psEnc.indices.signalType == SilkConstants.TYPE_VOICED)
{
/* Initially set to 0; may be overruled in process_gains(..) */
psEnc.indices.quantOffsetType = 0;
psEncCtrl.sparseness_Q8 = 0;
}
else
{
/* Sparseness measure, based on relative fluctuations of energy per 2 milliseconds */
nSamples = Inlines.silk_LSHIFT(psEnc.fs_kHz, 1);
energy_variation_Q7 = 0;
log_energy_prev_Q7 = 0;
pitch_res_ptr2 = pitch_res_ptr;
for (k = 0; k < Inlines.silk_SMULBB(SilkConstants.SUB_FRAME_LENGTH_MS, psEnc.nb_subfr) / 2; k++)
{
SumSqrShift.silk_sum_sqr_shift(out nrg, out scale, pitch_res, pitch_res_ptr2, nSamples);
nrg += Inlines.silk_RSHIFT(nSamples, scale); /* Q(-scale)*/
log_energy_Q7 = Inlines.silk_lin2log(nrg);
if (k > 0)
{
energy_variation_Q7 += Inlines.silk_abs(log_energy_Q7 - log_energy_prev_Q7);
}
log_energy_prev_Q7 = log_energy_Q7;
pitch_res_ptr2 += nSamples;
}
psEncCtrl.sparseness_Q8 = Inlines.silk_RSHIFT(Sigmoid.silk_sigm_Q15(Inlines.silk_SMULWB(energy_variation_Q7 -
((int)((5.0f) * ((long)1 << (7)) + 0.5)) /*Inlines.SILK_CONST(5.0f, 7)*/, ((int)((0.1f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(0.1f, 16)*/)), 7);
/* Set quantization offset depending on sparseness measure */
if (psEncCtrl.sparseness_Q8 > ((int)((TuningParameters.SPARSENESS_THRESHOLD_QNT_OFFSET) * ((long)1 << (8)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.SPARSENESS_THRESHOLD_QNT_OFFSET, 8)*/)
{
psEnc.indices.quantOffsetType = 0;
}
else
{
psEnc.indices.quantOffsetType = 1;
}
/* Increase coding SNR for sparse signals */
SNR_adj_dB_Q7 = Inlines.silk_SMLAWB(SNR_adj_dB_Q7, ((int)((TuningParameters.SPARSE_SNR_INCR_dB) * ((long)1 << (15)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.SPARSE_SNR_INCR_dB, 15)*/, psEncCtrl.sparseness_Q8 - ((int)((0.5f) * ((long)1 << (8)) + 0.5)) /*Inlines.SILK_CONST(0.5f, 8)*/);
}
/*******************************/
/* Control bandwidth expansion */
/*******************************/
/* More BWE for signals with high prediction gain */
strength_Q16 = Inlines.silk_SMULWB(psEncCtrl.predGain_Q16, ((int)((TuningParameters.FIND_PITCH_WHITE_NOISE_FRACTION) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.FIND_PITCH_WHITE_NOISE_FRACTION, 16)*/);
BWExp1_Q16 = BWExp2_Q16 = Inlines.silk_DIV32_varQ(((int)((TuningParameters.BANDWIDTH_EXPANSION) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.BANDWIDTH_EXPANSION, 16)*/,
Inlines.silk_SMLAWW(((int)((1.0f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 16)*/, strength_Q16, strength_Q16), 16);
delta_Q16 = Inlines.silk_SMULWB(((int)((1.0f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 16)*/ - Inlines.silk_SMULBB(3, psEncCtrl.coding_quality_Q14),
((int)((TuningParameters.LOW_RATE_BANDWIDTH_EXPANSION_DELTA) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.LOW_RATE_BANDWIDTH_EXPANSION_DELTA, 16)*/);
BWExp1_Q16 = Inlines.silk_SUB32(BWExp1_Q16, delta_Q16);
BWExp2_Q16 = Inlines.silk_ADD32(BWExp2_Q16, delta_Q16);
/* BWExp1 will be applied after BWExp2, so make it relative */
BWExp1_Q16 = Inlines.silk_DIV32_16(Inlines.silk_LSHIFT(BWExp1_Q16, 14), Inlines.silk_RSHIFT(BWExp2_Q16, 2));
if (psEnc.warping_Q16 > 0)
{
/* Slightly more warping in analysis will move quantization noise up in frequency, where it's better masked */
warping_Q16 = Inlines.silk_SMLAWB(psEnc.warping_Q16, (int)psEncCtrl.coding_quality_Q14, ((int)((0.01f) * ((long)1 << (18)) + 0.5)) /*Inlines.SILK_CONST(0.01f, 18)*/);
}
else
{
warping_Q16 = 0;
}
/********************************************/
/* Compute noise shaping AR coefs and gains */
/********************************************/
x_windowed = new short[psEnc.shapeWinLength];
for (k = 0; k < psEnc.nb_subfr; k++)
{
/* Apply window: sine slope followed by flat part followed by cosine slope */
int shift, slope_part, flat_part;
flat_part = psEnc.fs_kHz * 3;
slope_part = Inlines.silk_RSHIFT(psEnc.shapeWinLength - flat_part, 1);
ApplySineWindow.silk_apply_sine_window(x_windowed, 0, x, x_ptr2, 1, slope_part);
shift = slope_part;
Array.Copy(x, x_ptr2 + shift, x_windowed, shift, flat_part);
shift += flat_part;
ApplySineWindow.silk_apply_sine_window(x_windowed, shift, x, x_ptr2 + shift, 2, slope_part);
/* Update pointer: next LPC analysis block */
x_ptr2 += psEnc.subfr_length;
BoxedValueInt scale_boxed = new BoxedValueInt(scale);
if (psEnc.warping_Q16 > 0)
{
/* Calculate warped auto correlation */
Autocorrelation.silk_warped_autocorrelation(auto_corr, scale_boxed, x_windowed, warping_Q16, psEnc.shapeWinLength, psEnc.shapingLPCOrder);
}
else
{
/* Calculate regular auto correlation */
Autocorrelation.silk_autocorr(auto_corr, scale_boxed, x_windowed, psEnc.shapeWinLength, psEnc.shapingLPCOrder + 1);
}
scale = scale_boxed.Val;
/* Add white noise, as a fraction of energy */
auto_corr[0] = Inlines.silk_ADD32(auto_corr[0], Inlines.silk_max_32(Inlines.silk_SMULWB(Inlines.silk_RSHIFT(auto_corr[0], 4),
((int)((TuningParameters.SHAPE_WHITE_NOISE_FRACTION) * ((long)1 << (20)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.SHAPE_WHITE_NOISE_FRACTION, 20)*/), 1));
/* Calculate the reflection coefficients using schur */
nrg = Schur.silk_schur64(refl_coef_Q16, auto_corr, psEnc.shapingLPCOrder);
Inlines.OpusAssert(nrg >= 0);
/* Convert reflection coefficients to prediction coefficients */
K2A.silk_k2a_Q16(AR2_Q24, refl_coef_Q16, psEnc.shapingLPCOrder);
Qnrg = -scale; /* range: -12...30*/
Inlines.OpusAssert(Qnrg >= -12);
Inlines.OpusAssert(Qnrg <= 30);
/* Make sure that Qnrg is an even number */
if ((Qnrg & 1) != 0)
{
Qnrg -= 1;
nrg >>= 1;
}
tmp32 = Inlines.silk_SQRT_APPROX(nrg);
Qnrg >>= 1; /* range: -6...15*/
psEncCtrl.Gains_Q16[k] = Inlines.silk_LSHIFT_SAT32(tmp32, 16 - Qnrg);
if (psEnc.warping_Q16 > 0)
{
/* Adjust gain for warping */
gain_mult_Q16 = warped_gain(AR2_Q24, warping_Q16, psEnc.shapingLPCOrder);
Inlines.OpusAssert(psEncCtrl.Gains_Q16[k] >= 0);
if (Inlines.silk_SMULWW(Inlines.silk_RSHIFT_ROUND(psEncCtrl.Gains_Q16[k], 1), gain_mult_Q16) >= (int.MaxValue >> 1))
{
psEncCtrl.Gains_Q16[k] = int.MaxValue;
}
else
{
psEncCtrl.Gains_Q16[k] = Inlines.silk_SMULWW(psEncCtrl.Gains_Q16[k], gain_mult_Q16);
}
}
/* Bandwidth expansion for synthesis filter shaping */
BWExpander.silk_bwexpander_32(AR2_Q24, psEnc.shapingLPCOrder, BWExp2_Q16);
/* Compute noise shaping filter coefficients */
Array.Copy(AR2_Q24, AR1_Q24, psEnc.shapingLPCOrder);
/* Bandwidth expansion for analysis filter shaping */
Inlines.OpusAssert(BWExp1_Q16 <= ((int)((1.0f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 16)*/);
BWExpander.silk_bwexpander_32(AR1_Q24, psEnc.shapingLPCOrder, BWExp1_Q16);
/* Ratio of prediction gains, in energy domain */
pre_nrg_Q30 = LPCInversePredGain.silk_LPC_inverse_pred_gain_Q24(AR2_Q24, psEnc.shapingLPCOrder);
nrg = LPCInversePredGain.silk_LPC_inverse_pred_gain_Q24(AR1_Q24, psEnc.shapingLPCOrder);
/*psEncCtrl.GainsPre[ k ] = 1.0f - 0.7f * ( 1.0f - pre_nrg / nrg ) = 0.3f + 0.7f * pre_nrg / nrg;*/
pre_nrg_Q30 = Inlines.silk_LSHIFT32(Inlines.silk_SMULWB(pre_nrg_Q30, ((int)((0.7f) * ((long)1 << (15)) + 0.5)) /*Inlines.SILK_CONST(0.7f, 15)*/), 1);
psEncCtrl.GainsPre_Q14[k] = (int)((int)((0.3f) * ((long)1 << (14)) + 0.5)) /*Inlines.SILK_CONST(0.3f, 14)*/ + Inlines.silk_DIV32_varQ(pre_nrg_Q30, nrg, 14);
/* Convert to monic warped prediction coefficients and limit absolute values */
limit_warped_coefs(AR2_Q24, AR1_Q24, warping_Q16, ((int)((3.999f) * ((long)1 << (24)) + 0.5)) /*Inlines.SILK_CONST(3.999f, 24)*/, psEnc.shapingLPCOrder);
/* Convert from Q24 to Q13 and store in int16 */
for (i = 0; i < psEnc.shapingLPCOrder; i++)
{
psEncCtrl.AR1_Q13[k * SilkConstants.MAX_SHAPE_LPC_ORDER + i] = (short)Inlines.silk_SAT16(Inlines.silk_RSHIFT_ROUND(AR1_Q24[i], 11));
psEncCtrl.AR2_Q13[k * SilkConstants.MAX_SHAPE_LPC_ORDER + i] = (short)Inlines.silk_SAT16(Inlines.silk_RSHIFT_ROUND(AR2_Q24[i], 11));
}
}
/*****************/
/* Gain tweaking */
/*****************/
/* Increase gains during low speech activity and put lower limit on gains */
gain_mult_Q16 = Inlines.silk_log2lin(-Inlines.silk_SMLAWB(-((int)((16.0f) * ((long)1 << (7)) + 0.5)) /*Inlines.SILK_CONST(16.0f, 7)*/, SNR_adj_dB_Q7, ((int)((0.16f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(0.16f, 16)*/));
gain_add_Q16 = Inlines.silk_log2lin(Inlines.silk_SMLAWB(((int)((16.0f) * ((long)1 << (7)) + 0.5)) /*Inlines.SILK_CONST(16.0f, 7)*/, ((int)((SilkConstants.MIN_QGAIN_DB) * ((long)1 << (7)) + 0.5)) /*Inlines.SILK_CONST(SilkConstants.MIN_QGAIN_DB, 7)*/, ((int)((0.16f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(0.16f, 16)*/));
Inlines.OpusAssert(gain_mult_Q16 > 0);
for (k = 0; k < psEnc.nb_subfr; k++)
{
psEncCtrl.Gains_Q16[k] = Inlines.silk_SMULWW(psEncCtrl.Gains_Q16[k], gain_mult_Q16);
Inlines.OpusAssert(psEncCtrl.Gains_Q16[k] >= 0);
psEncCtrl.Gains_Q16[k] = Inlines.silk_ADD_POS_SAT32(psEncCtrl.Gains_Q16[k], gain_add_Q16);
}
gain_mult_Q16 = ((int)((1.0f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 16)*/ + Inlines.silk_RSHIFT_ROUND(Inlines.silk_MLA(((int)((TuningParameters.INPUT_TILT) * ((long)1 << (26)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.INPUT_TILT, 26)*/,
psEncCtrl.coding_quality_Q14, ((int)((TuningParameters.HIGH_RATE_INPUT_TILT) * ((long)1 << (12)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.HIGH_RATE_INPUT_TILT, 12)*/), 10);
for (k = 0; k < psEnc.nb_subfr; k++)
{
psEncCtrl.GainsPre_Q14[k] = Inlines.silk_SMULWB(gain_mult_Q16, psEncCtrl.GainsPre_Q14[k]);
}
/************************************************/
/* Control low-frequency shaping and noise tilt */
/************************************************/
/* Less low frequency shaping for noisy inputs */
strength_Q16 = Inlines.silk_MUL(((int)((TuningParameters.LOW_FREQ_SHAPING) * ((long)1 << (4)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.LOW_FREQ_SHAPING, 4)*/, Inlines.silk_SMLAWB(((int)((1.0f) * ((long)1 << (12)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 12)*/,
((int)((TuningParameters.LOW_QUALITY_LOW_FREQ_SHAPING_DECR) * ((long)1 << (13)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.LOW_QUALITY_LOW_FREQ_SHAPING_DECR, 13)*/, psEnc.input_quality_bands_Q15[0] - ((int)((1.0f) * ((long)1 << (15)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 15)*/));
strength_Q16 = Inlines.silk_RSHIFT(Inlines.silk_MUL(strength_Q16, psEnc.speech_activity_Q8), 8);
if (psEnc.indices.signalType == SilkConstants.TYPE_VOICED)
{
/* Reduce low frequencies quantization noise for periodic signals, depending on pitch lag */
/*f = 400; freqz([1, -0.98 + 2e-4 * f], [1, -0.97 + 7e-4 * f], 2^12, Fs); axis([0, 1000, -10, 1])*/
int fs_kHz_inv = Inlines.silk_DIV32_16(((int)((0.2f) * ((long)1 << (14)) + 0.5)) /*Inlines.SILK_CONST(0.2f, 14)*/, psEnc.fs_kHz);
for (k = 0; k < psEnc.nb_subfr; k++)
{
b_Q14 = fs_kHz_inv + Inlines.silk_DIV32_16(((int)((3.0f) * ((long)1 << (14)) + 0.5)) /*Inlines.SILK_CONST(3.0f, 14)*/, psEncCtrl.pitchL[k]);
/* Pack two coefficients in one int32 */
psEncCtrl.LF_shp_Q14[k] = Inlines.silk_LSHIFT(((int)((1.0f) * ((long)1 << (14)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 14)*/ - b_Q14 - Inlines.silk_SMULWB(strength_Q16, b_Q14), 16);
psEncCtrl.LF_shp_Q14[k] |= (b_Q14 - ((int)((1.0f) * ((long)1 << (14)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 14)*/) & 0xFFFF; // opus bug: again, cast to ushort was done here where bitwise masking was intended
}
Inlines.OpusAssert(((int)((TuningParameters.HARM_HP_NOISE_COEF) * ((long)1 << (24)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.HARM_HP_NOISE_COEF, 24)*/ < ((int)((0.5f) * ((long)1 << (24)) + 0.5)) /*Inlines.SILK_CONST(0.5f, 24)*/); /* Guarantees that second argument to SMULWB() is within range of an short*/
Tilt_Q16 = -((int)((TuningParameters.HP_NOISE_COEF) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.HP_NOISE_COEF, 16)*/ -
Inlines.silk_SMULWB(((int)((1.0f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 16)*/ - ((int)((TuningParameters.HP_NOISE_COEF) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.HP_NOISE_COEF, 16)*/,
Inlines.silk_SMULWB(((int)((TuningParameters.HARM_HP_NOISE_COEF) * ((long)1 << (24)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.HARM_HP_NOISE_COEF, 24)*/, psEnc.speech_activity_Q8));
}
else
{
b_Q14 = Inlines.silk_DIV32_16(21299, psEnc.fs_kHz); /* 1.3_Q0 = 21299_Q14*/
/* Pack two coefficients in one int32 */
psEncCtrl.LF_shp_Q14[0] = Inlines.silk_LSHIFT(((int)((1.0f) * ((long)1 << (14)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 14)*/ - b_Q14 -
Inlines.silk_SMULWB(strength_Q16, Inlines.silk_SMULWB(((int)((0.6f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(0.6f, 16)*/, b_Q14)), 16);
psEncCtrl.LF_shp_Q14[0] |= (b_Q14 - ((int)((1.0f) * ((long)1 << (14)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 14)*/) & 0xFFFF; // opus bug: cast to ushort is better expressed as a bitwise operator, otherwise runtime analysis might flag it as an overflow error
for (k = 1; k < psEnc.nb_subfr; k++)
{
psEncCtrl.LF_shp_Q14[k] = psEncCtrl.LF_shp_Q14[0];
}
Tilt_Q16 = -((int)((TuningParameters.HP_NOISE_COEF) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.HP_NOISE_COEF, 16)*/;
}
/****************************/
/* HARMONIC SHAPING CONTROL */
/****************************/
/* Control boosting of harmonic frequencies */
HarmBoost_Q16 = Inlines.silk_SMULWB(Inlines.silk_SMULWB(((int)((1.0f) * ((long)1 << (17)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 17)*/ - Inlines.silk_LSHIFT(psEncCtrl.coding_quality_Q14, 3),
psEnc.LTPCorr_Q15), ((int)((TuningParameters.LOW_RATE_HARMONIC_BOOST) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.LOW_RATE_HARMONIC_BOOST, 16)*/);
/* More harmonic boost for noisy input signals */
HarmBoost_Q16 = Inlines.silk_SMLAWB(HarmBoost_Q16,
((int)((1.0f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 16)*/ - Inlines.silk_LSHIFT(psEncCtrl.input_quality_Q14, 2), ((int)((TuningParameters.LOW_INPUT_QUALITY_HARMONIC_BOOST) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.LOW_INPUT_QUALITY_HARMONIC_BOOST, 16)*/);
if (SilkConstants.USE_HARM_SHAPING != 0 && psEnc.indices.signalType == SilkConstants.TYPE_VOICED)
{
/* More harmonic noise shaping for high bitrates or noisy input */
HarmShapeGain_Q16 = Inlines.silk_SMLAWB(((int)((TuningParameters.HARMONIC_SHAPING) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.HARMONIC_SHAPING, 16)*/,
((int)((1.0f) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 16)*/ - Inlines.silk_SMULWB(((int)((1.0f) * ((long)1 << (18)) + 0.5)) /*Inlines.SILK_CONST(1.0f, 18)*/ - Inlines.silk_LSHIFT(psEncCtrl.coding_quality_Q14, 4),
psEncCtrl.input_quality_Q14), ((int)((TuningParameters.HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING, 16)*/);
/* Less harmonic noise shaping for less periodic signals */
HarmShapeGain_Q16 = Inlines.silk_SMULWB(Inlines.silk_LSHIFT(HarmShapeGain_Q16, 1),
Inlines.silk_SQRT_APPROX(Inlines.silk_LSHIFT(psEnc.LTPCorr_Q15, 15)));
}
else
{
HarmShapeGain_Q16 = 0;
}
/*************************/
/* Smooth over subframes */
/*************************/
for (k = 0; k < SilkConstants.MAX_NB_SUBFR; k++)
{
psShapeSt.HarmBoost_smth_Q16 =
Inlines.silk_SMLAWB(psShapeSt.HarmBoost_smth_Q16, HarmBoost_Q16 - psShapeSt.HarmBoost_smth_Q16, ((int)((TuningParameters.SUBFR_SMTH_COEF) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.SUBFR_SMTH_COEF, 16)*/);
psShapeSt.HarmShapeGain_smth_Q16 =
Inlines.silk_SMLAWB(psShapeSt.HarmShapeGain_smth_Q16, HarmShapeGain_Q16 - psShapeSt.HarmShapeGain_smth_Q16, ((int)((TuningParameters.SUBFR_SMTH_COEF) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.SUBFR_SMTH_COEF, 16)*/);
psShapeSt.Tilt_smth_Q16 =
Inlines.silk_SMLAWB(psShapeSt.Tilt_smth_Q16, Tilt_Q16 - psShapeSt.Tilt_smth_Q16, ((int)((TuningParameters.SUBFR_SMTH_COEF) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(TuningParameters.SUBFR_SMTH_COEF, 16)*/);
psEncCtrl.HarmBoost_Q14[k] = (int)Inlines.silk_RSHIFT_ROUND(psShapeSt.HarmBoost_smth_Q16, 2);
psEncCtrl.HarmShapeGain_Q14[k] = (int)Inlines.silk_RSHIFT_ROUND(psShapeSt.HarmShapeGain_smth_Q16, 2);
psEncCtrl.Tilt_Q14[k] = (int)Inlines.silk_RSHIFT_ROUND(psShapeSt.Tilt_smth_Q16, 2);
}
}
internal static void silk_PLC_conceal(
SilkChannelDecoder psDec, /* I/O Decoder state */
SilkDecoderControl psDecCtrl, /* I/O Decoder control */
short[] frame, /* O LPC residual signal */
int frame_ptr
)
{
int i, j, k;
int lag, idx, sLTP_buf_idx;
int rand_seed, harm_Gain_Q15, rand_Gain_Q15, inv_gain_Q30;
int energy1, energy2, shift1, shift2;
int rand_ptr;
int pred_lag_ptr;
int LPC_pred_Q10, LTP_pred_Q12;
short rand_scale_Q14;
short[] B_Q14;
int sLPC_Q14_ptr;
short[] sLTP = new short[psDec.ltp_mem_length];
int[] sLTP_Q14 = new int[psDec.ltp_mem_length + psDec.frame_length];
PLCStruct psPLC = psDec.sPLC;
int[] prevGain_Q10 = new int[2];
prevGain_Q10[0] = Inlines.silk_RSHIFT(psPLC.prevGain_Q16[0], 6);
prevGain_Q10[1] = Inlines.silk_RSHIFT(psPLC.prevGain_Q16[1], 6);
if (psDec.first_frame_after_reset != 0)
{
Arrays.MemSetShort(psPLC.prevLPC_Q12, 0, SilkConstants.MAX_LPC_ORDER);
}
silk_PLC_energy(out energy1, out shift1, out energy2, out shift2, psDec.exc_Q14, prevGain_Q10, psDec.subfr_length, psDec.nb_subfr);
if (Inlines.silk_RSHIFT(energy1, shift2) < Inlines.silk_RSHIFT(energy2, shift1))
{
/* First sub-frame has lowest energy */
rand_ptr = Inlines.silk_max_int(0, (psPLC.nb_subfr - 1) * psPLC.subfr_length - SilkConstants.RAND_BUF_SIZE);
}
else
{
/* Second sub-frame has lowest energy */
rand_ptr = Inlines.silk_max_int(0, psPLC.nb_subfr * psPLC.subfr_length - SilkConstants.RAND_BUF_SIZE);
}
/* Set up Gain to random noise component */
B_Q14 = psPLC.LTPCoef_Q14;
rand_scale_Q14 = psPLC.randScale_Q14;
/* Set up attenuation gains */
harm_Gain_Q15 = HARM_ATT_Q15[Inlines.silk_min_int(NB_ATT - 1, psDec.lossCnt)];
if (psDec.prevSignalType == SilkConstants.TYPE_VOICED)
{
rand_Gain_Q15 = PLC_RAND_ATTENUATE_V_Q15[Inlines.silk_min_int(NB_ATT - 1, psDec.lossCnt)];
}
else
{
rand_Gain_Q15 = PLC_RAND_ATTENUATE_UV_Q15[Inlines.silk_min_int(NB_ATT - 1, psDec.lossCnt)];
}
/* LPC concealment. Apply BWE to previous LPC */
BWExpander.silk_bwexpander(psPLC.prevLPC_Q12, psDec.LPC_order, ((int)((SilkConstants.BWE_COEF) * ((long)1 << (16)) + 0.5)) /*Inlines.SILK_CONST(SilkConstants.BWE_COEF, 16)*/);
/* First Lost frame */
if (psDec.lossCnt == 0)
{
rand_scale_Q14 = 1 << 14;
/* Reduce random noise Gain for voiced frames */
if (psDec.prevSignalType == SilkConstants.TYPE_VOICED)
{
for (i = 0; i < SilkConstants.LTP_ORDER; i++)
{
rand_scale_Q14 -= B_Q14[i];
}
rand_scale_Q14 = Inlines.silk_max_16(3277, rand_scale_Q14); /* 0.2 */
rand_scale_Q14 = (short)Inlines.silk_RSHIFT(Inlines.silk_SMULBB(rand_scale_Q14, psPLC.prevLTP_scale_Q14), 14);
}
else
{
/* Reduce random noise for unvoiced frames with high LPC gain */
int invGain_Q30, down_scale_Q30;
invGain_Q30 = LPCInversePredGain.silk_LPC_inverse_pred_gain(psPLC.prevLPC_Q12, psDec.LPC_order);
down_scale_Q30 = Inlines.silk_min_32(Inlines.silk_RSHIFT((int)1 << 30, SilkConstants.LOG2_INV_LPC_GAIN_HIGH_THRES), invGain_Q30);
down_scale_Q30 = Inlines.silk_max_32(Inlines.silk_RSHIFT((int)1 << 30, SilkConstants.LOG2_INV_LPC_GAIN_LOW_THRES), down_scale_Q30);
down_scale_Q30 = Inlines.silk_LSHIFT(down_scale_Q30, SilkConstants.LOG2_INV_LPC_GAIN_HIGH_THRES);
rand_Gain_Q15 = Inlines.silk_RSHIFT(Inlines.silk_SMULWB(down_scale_Q30, rand_Gain_Q15), 14);
}
}
rand_seed = psPLC.rand_seed;
lag = Inlines.silk_RSHIFT_ROUND(psPLC.pitchL_Q8, 8);
sLTP_buf_idx = psDec.ltp_mem_length;
/* Rewhiten LTP state */
idx = psDec.ltp_mem_length - lag - psDec.LPC_order - SilkConstants.LTP_ORDER / 2;
Inlines.OpusAssert(idx > 0);
Filters.silk_LPC_analysis_filter(sLTP, idx, psDec.outBuf, idx, psPLC.prevLPC_Q12, 0, psDec.ltp_mem_length - idx, psDec.LPC_order);
/* Scale LTP state */
inv_gain_Q30 = Inlines.silk_INVERSE32_varQ(psPLC.prevGain_Q16[1], 46);
inv_gain_Q30 = Inlines.silk_min(inv_gain_Q30, int.MaxValue >> 1);
for (i = idx + psDec.LPC_order; i < psDec.ltp_mem_length; i++)
{
sLTP_Q14[i] = Inlines.silk_SMULWB(inv_gain_Q30, sLTP[i]);
}
/***************************/
/* LTP synthesis filtering */
/***************************/
for (k = 0; k < psDec.nb_subfr; k++)
{
/* Set up pointer */
pred_lag_ptr = sLTP_buf_idx - lag + SilkConstants.LTP_ORDER / 2;
for (i = 0; i < psDec.subfr_length; i++)
{
/* Unrolled loop */
/* Avoids introducing a bias because Inlines.silk_SMLAWB() always rounds to -inf */
LTP_pred_Q12 = 2;
LTP_pred_Q12 = Inlines.silk_SMLAWB(LTP_pred_Q12, sLTP_Q14[pred_lag_ptr], B_Q14[0]);
LTP_pred_Q12 = Inlines.silk_SMLAWB(LTP_pred_Q12, sLTP_Q14[pred_lag_ptr - 1], B_Q14[1]);
LTP_pred_Q12 = Inlines.silk_SMLAWB(LTP_pred_Q12, sLTP_Q14[pred_lag_ptr - 2], B_Q14[2]);
LTP_pred_Q12 = Inlines.silk_SMLAWB(LTP_pred_Q12, sLTP_Q14[pred_lag_ptr - 3], B_Q14[3]);
LTP_pred_Q12 = Inlines.silk_SMLAWB(LTP_pred_Q12, sLTP_Q14[pred_lag_ptr - 4], B_Q14[4]);
pred_lag_ptr++;
/* Generate LPC excitation */
rand_seed = Inlines.silk_RAND(rand_seed);
idx = Inlines.silk_RSHIFT(rand_seed, 25) & SilkConstants.RAND_BUF_MASK;
sLTP_Q14[sLTP_buf_idx] = Inlines.silk_LSHIFT32(Inlines.silk_SMLAWB(LTP_pred_Q12, psDec.exc_Q14[rand_ptr + idx], rand_scale_Q14), 2);
sLTP_buf_idx++;
}
/* Gradually reduce LTP gain */
for (j = 0; j < SilkConstants.LTP_ORDER; j++)
{
B_Q14[j] = (short)(Inlines.silk_RSHIFT(Inlines.silk_SMULBB(harm_Gain_Q15, B_Q14[j]), 15));
}
/* Gradually reduce excitation gain */
rand_scale_Q14 = (short)(Inlines.silk_RSHIFT(Inlines.silk_SMULBB(rand_scale_Q14, rand_Gain_Q15), 15));
/* Slowly increase pitch lag */
psPLC.pitchL_Q8 = Inlines.silk_SMLAWB(psPLC.pitchL_Q8, psPLC.pitchL_Q8, SilkConstants.PITCH_DRIFT_FAC_Q16);
psPLC.pitchL_Q8 = Inlines.silk_min_32(psPLC.pitchL_Q8, Inlines.silk_LSHIFT(Inlines.silk_SMULBB(SilkConstants.MAX_PITCH_LAG_MS, psDec.fs_kHz), 8));
lag = Inlines.silk_RSHIFT_ROUND(psPLC.pitchL_Q8, 8);
}
/***************************/
/* LPC synthesis filtering */
/***************************/
sLPC_Q14_ptr = psDec.ltp_mem_length - SilkConstants.MAX_LPC_ORDER;
/* Copy LPC state */
Array.Copy(psDec.sLPC_Q14_buf, 0, sLTP_Q14, sLPC_Q14_ptr, SilkConstants.MAX_LPC_ORDER);
Inlines.OpusAssert(psDec.LPC_order >= 10); /* check that unrolling works */
for (i = 0; i < psDec.frame_length; i++)
{
/* partly unrolled */
int sLPCmaxi = sLPC_Q14_ptr + SilkConstants.MAX_LPC_ORDER + i;
/* Avoids introducing a bias because Inlines.silk_SMLAWB() always rounds to -inf */
LPC_pred_Q10 = Inlines.silk_RSHIFT(psDec.LPC_order, 1);
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - 1], psPLC.prevLPC_Q12[0]);
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - 2], psPLC.prevLPC_Q12[1]);
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - 3], psPLC.prevLPC_Q12[2]);
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - 4], psPLC.prevLPC_Q12[3]);
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - 5], psPLC.prevLPC_Q12[4]);
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - 6], psPLC.prevLPC_Q12[5]);
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - 7], psPLC.prevLPC_Q12[6]);
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - 8], psPLC.prevLPC_Q12[7]);
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - 9], psPLC.prevLPC_Q12[8]);
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - 10], psPLC.prevLPC_Q12[9]);
for (j = 10; j < psDec.LPC_order; j++)
{
LPC_pred_Q10 = Inlines.silk_SMLAWB(LPC_pred_Q10, sLTP_Q14[sLPCmaxi - j - 1], psPLC.prevLPC_Q12[j]);
}
/* Add prediction to LPC excitation */
sLTP_Q14[sLPCmaxi] = Inlines.silk_ADD_LSHIFT32(sLTP_Q14[sLPCmaxi], LPC_pred_Q10, 4);
/* Scale with Gain */
frame[frame_ptr + i] = (short)Inlines.silk_SAT16(Inlines.silk_SAT16(Inlines.silk_RSHIFT_ROUND(Inlines.silk_SMULWW(sLTP_Q14[sLPCmaxi], prevGain_Q10[1]), 8)));
}
/* Save LPC state */
Array.Copy(sLTP_Q14, sLPC_Q14_ptr + psDec.frame_length, psDec.sLPC_Q14_buf, 0, SilkConstants.MAX_LPC_ORDER);
/**************************************/
/* Update states */
/**************************************/
psPLC.rand_seed = rand_seed;
psPLC.randScale_Q14 = rand_scale_Q14;
for (i = 0; i < SilkConstants.MAX_NB_SUBFR; i++)
{
psDecCtrl.pitchL[i] = lag;
}
}
