first commit

source/decompiled/de/maxhenkel/voicechat/concentus/LPCInversePredGain.java

@@ -0,0 +1,74 @@
+/*
+ * Decompiled with CFR 0.152.
+ */
+package de.maxhenkel.voicechat.concentus;
+
+import de.maxhenkel.voicechat.concentus.Arrays;
+import de.maxhenkel.voicechat.concentus.Inlines;
+
+class LPCInversePredGain {
+    private static final int QA = 24;
+    private static final int A_LIMIT = 0xFFEF9E;
+
+    LPCInversePredGain() {
+    }
+
+    static int LPC_inverse_pred_gain_QA(int[][] A_QA, int order) {
+        int rc_mult1_Q30;
+        int rc_Q31;
+        int[] Anew_QA = A_QA[order & 1];
+        int invGain_Q30 = 0x40000000;
+        for (int k = order - 1; k > 0; --k) {
+            if (Anew_QA[k] > 0xFFEF9E || Anew_QA[k] < -16773022) {
+                return 0;
+            }
+            rc_Q31 = 0 - Inlines.silk_LSHIFT(Anew_QA[k], 7);
+            rc_mult1_Q30 = 0x40000000 - Inlines.silk_SMMUL(rc_Q31, rc_Q31);
+            Inlines.OpusAssert(rc_mult1_Q30 > 32768);
+            Inlines.OpusAssert(rc_mult1_Q30 <= 0x40000000);
+            int mult2Q = 32 - Inlines.silk_CLZ32(Inlines.silk_abs(rc_mult1_Q30));
+            int rc_mult2 = Inlines.silk_INVERSE32_varQ(rc_mult1_Q30, mult2Q + 30);
+            invGain_Q30 = Inlines.silk_LSHIFT(Inlines.silk_SMMUL(invGain_Q30, rc_mult1_Q30), 2);
+            Inlines.OpusAssert(invGain_Q30 >= 0);
+            Inlines.OpusAssert(invGain_Q30 <= 0x40000000);
+            int[] Aold_QA = Anew_QA;
+            Anew_QA = A_QA[k & 1];
+            for (int n = 0; n < k; ++n) {
+                int tmp_QA = Aold_QA[n] - Inlines.MUL32_FRAC_Q(Aold_QA[k - n - 1], rc_Q31, 31);
+                Anew_QA[n] = Inlines.MUL32_FRAC_Q(tmp_QA, rc_mult2, mult2Q);
+            }
+        }
+        if (Anew_QA[0] > 0xFFEF9E || Anew_QA[0] < -16773022) {
+            return 0;
+        }
+        rc_Q31 = 0 - Inlines.silk_LSHIFT(Anew_QA[0], 7);
+        rc_mult1_Q30 = 0x40000000 - Inlines.silk_SMMUL(rc_Q31, rc_Q31);
+        Inlines.OpusAssert((invGain_Q30 = Inlines.silk_LSHIFT(Inlines.silk_SMMUL(invGain_Q30, rc_mult1_Q30), 2)) >= 0);
+        Inlines.OpusAssert(invGain_Q30 <= 0x40000000);
+        return invGain_Q30;
+    }
+
+    static int silk_LPC_inverse_pred_gain(short[] A_Q12, int order) {
+        int[][] Atmp_QA = Arrays.InitTwoDimensionalArrayInt(2, 16);
+        int DC_resp = 0;
+        int[] Anew_QA = Atmp_QA[order & 1];
+        for (int k = 0; k < order; ++k) {
+            DC_resp += A_Q12[k];
+            Anew_QA[k] = Inlines.silk_LSHIFT32(A_Q12[k], 12);
+        }
+        if (DC_resp >= 4096) {
+            return 0;
+        }
+        return LPCInversePredGain.LPC_inverse_pred_gain_QA(Atmp_QA, order);
+    }
+
+    static int silk_LPC_inverse_pred_gain_Q24(int[] A_Q24, int order) {
+        int[][] Atmp_QA = Arrays.InitTwoDimensionalArrayInt(2, 16);
+        int[] Anew_QA = Atmp_QA[order & 1];
+        for (int k = 0; k < order; ++k) {
+            Anew_QA[k] = Inlines.silk_RSHIFT32(A_Q24[k], 0);
+        }
+        return LPCInversePredGain.LPC_inverse_pred_gain_QA(Atmp_QA, order);
+    }
+}
+