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81 lines
4.2 KiB
Java
81 lines
4.2 KiB
Java
/*
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* Decompiled with CFR 0.152.
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*/
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package de.maxhenkel.voicechat.concentus;
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import de.maxhenkel.voicechat.concentus.BoxedValueInt;
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import de.maxhenkel.voicechat.concentus.BurgModified;
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import de.maxhenkel.voicechat.concentus.Filters;
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import de.maxhenkel.voicechat.concentus.Inlines;
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import de.maxhenkel.voicechat.concentus.NLSF;
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import de.maxhenkel.voicechat.concentus.SilkChannelEncoder;
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import de.maxhenkel.voicechat.concentus.SumSqrShift;
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class FindLPC {
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FindLPC() {
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}
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static void silk_find_LPC(SilkChannelEncoder psEncC, short[] NLSF_Q15, short[] x, int minInvGain_Q30) {
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int[] a_Q16 = new int[16];
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BoxedValueInt res_nrg0 = new BoxedValueInt(0);
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BoxedValueInt res_nrg1 = new BoxedValueInt(0);
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BoxedValueInt rshift0 = new BoxedValueInt(0);
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BoxedValueInt rshift1 = new BoxedValueInt(0);
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BoxedValueInt scratch_box1 = new BoxedValueInt(0);
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BoxedValueInt scratch_box2 = new BoxedValueInt(0);
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int[] a_tmp_Q16 = new int[16];
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short[] a_tmp_Q12 = new short[16];
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short[] NLSF0_Q15 = new short[16];
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int subfr_length = psEncC.subfr_length + psEncC.predictLPCOrder;
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psEncC.indices.NLSFInterpCoef_Q2 = (byte)4;
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BurgModified.silk_burg_modified(scratch_box1, scratch_box2, a_Q16, x, 0, minInvGain_Q30, subfr_length, psEncC.nb_subfr, psEncC.predictLPCOrder);
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int res_nrg = scratch_box1.Val;
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int res_nrg_Q = scratch_box2.Val;
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if (psEncC.useInterpolatedNLSFs != 0 && psEncC.first_frame_after_reset == 0 && psEncC.nb_subfr == 4) {
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BurgModified.silk_burg_modified(scratch_box1, scratch_box2, a_tmp_Q16, x, 2 * subfr_length, minInvGain_Q30, subfr_length, 2, psEncC.predictLPCOrder);
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int res_tmp_nrg = scratch_box1.Val;
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int res_tmp_nrg_Q = scratch_box2.Val;
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int shift = res_tmp_nrg_Q - res_nrg_Q;
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if (shift >= 0) {
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if (shift < 32) {
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res_nrg -= Inlines.silk_RSHIFT(res_tmp_nrg, shift);
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}
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} else {
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Inlines.OpusAssert(shift > -32);
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res_nrg = Inlines.silk_RSHIFT(res_nrg, -shift) - res_tmp_nrg;
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res_nrg_Q = res_tmp_nrg_Q;
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}
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NLSF.silk_A2NLSF(NLSF_Q15, a_tmp_Q16, psEncC.predictLPCOrder);
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short[] LPC_res = new short[2 * subfr_length];
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for (int k = 3; k >= 0; --k) {
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int res_nrg_interp_Q;
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Inlines.silk_interpolate(NLSF0_Q15, psEncC.prev_NLSFq_Q15, NLSF_Q15, k, psEncC.predictLPCOrder);
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NLSF.silk_NLSF2A(a_tmp_Q12, NLSF0_Q15, psEncC.predictLPCOrder);
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Filters.silk_LPC_analysis_filter(LPC_res, 0, x, 0, a_tmp_Q12, 0, 2 * subfr_length, psEncC.predictLPCOrder);
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SumSqrShift.silk_sum_sqr_shift(res_nrg0, rshift0, LPC_res, psEncC.predictLPCOrder, subfr_length - psEncC.predictLPCOrder);
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SumSqrShift.silk_sum_sqr_shift(res_nrg1, rshift1, LPC_res, psEncC.predictLPCOrder + subfr_length, subfr_length - psEncC.predictLPCOrder);
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shift = rshift0.Val - rshift1.Val;
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if (shift >= 0) {
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res_nrg1.Val = Inlines.silk_RSHIFT(res_nrg1.Val, shift);
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res_nrg_interp_Q = 0 - rshift0.Val;
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} else {
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res_nrg0.Val = Inlines.silk_RSHIFT(res_nrg0.Val, 0 - shift);
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res_nrg_interp_Q = 0 - rshift1.Val;
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}
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int res_nrg_interp = Inlines.silk_ADD32(res_nrg0.Val, res_nrg1.Val);
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shift = res_nrg_interp_Q - res_nrg_Q;
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boolean isInterpLower = shift >= 0 ? Inlines.silk_RSHIFT(res_nrg_interp, shift) < res_nrg : (-shift < 32 ? res_nrg_interp < Inlines.silk_RSHIFT(res_nrg, -shift) : false);
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if (!isInterpLower) continue;
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res_nrg = res_nrg_interp;
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res_nrg_Q = res_nrg_interp_Q;
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psEncC.indices.NLSFInterpCoef_Q2 = (byte)k;
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}
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}
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if (psEncC.indices.NLSFInterpCoef_Q2 == 4) {
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NLSF.silk_A2NLSF(NLSF_Q15, a_Q16, psEncC.predictLPCOrder);
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}
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Inlines.OpusAssert(psEncC.indices.NLSFInterpCoef_Q2 == 4 || psEncC.useInterpolatedNLSFs != 0 && psEncC.first_frame_after_reset == 0 && psEncC.nb_subfr == 4);
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}
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}
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