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

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+/*
+ * Decompiled with CFR 0.152.
+ */
+package de.maxhenkel.voicechat.concentus;
+
+import de.maxhenkel.voicechat.concentus.EntropyCoder;
+import de.maxhenkel.voicechat.concentus.Inlines;
+import de.maxhenkel.voicechat.concentus.SilkTables;
+
+class CodeSigns {
+    CodeSigns() {
+    }
+
+    private static int silk_enc_map(int a) {
+        return Inlines.silk_RSHIFT(a, 15) + 1;
+    }
+
+    private static int silk_dec_map(int a) {
+        return Inlines.silk_LSHIFT(a, 1) - 1;
+    }
+
+    static void silk_encode_signs(EntropyCoder psRangeEnc, byte[] pulses, int length, int signalType, int quantOffsetType, int[] sum_pulses) {
+        int i;
+        short[] icdf = new short[2];
+        short[] sign_icdf = SilkTables.silk_sign_iCDF;
+        icdf[1] = 0;
+        int q_ptr = 0;
+        int icdf_ptr = i = Inlines.silk_SMULBB(7, Inlines.silk_ADD_LSHIFT(quantOffsetType, signalType, 1));
+        length = Inlines.silk_RSHIFT(length + 8, 4);
+        for (i = 0; i < length; ++i) {
+            int p = sum_pulses[i];
+            if (p > 0) {
+                icdf[0] = sign_icdf[icdf_ptr + Inlines.silk_min(p & 0x1F, 6)];
+                for (int j = q_ptr; j < q_ptr + 16; ++j) {
+                    if (pulses[j] == 0) continue;
+                    psRangeEnc.enc_icdf(CodeSigns.silk_enc_map(pulses[j]), icdf, 8);
+                }
+            }
+            q_ptr += 16;
+        }
+    }
+
+    static void silk_decode_signs(EntropyCoder psRangeDec, short[] pulses, int length, int signalType, int quantOffsetType, int[] sum_pulses) {
+        int i;
+        short[] icdf = new short[2];
+        short[] icdf_table = SilkTables.silk_sign_iCDF;
+        icdf[1] = 0;
+        int q_ptr = 0;
+        int icdf_ptr = i = Inlines.silk_SMULBB(7, Inlines.silk_ADD_LSHIFT(quantOffsetType, signalType, 1));
+        length = Inlines.silk_RSHIFT(length + 8, 4);
+        for (i = 0; i < length; ++i) {
+            int p = sum_pulses[i];
+            if (p > 0) {
+                icdf[0] = icdf_table[icdf_ptr + Inlines.silk_min(p & 0x1F, 6)];
+                for (int j = 0; j < 16; ++j) {
+                    if (pulses[q_ptr + j] <= 0) continue;
+                    int n = q_ptr + j;
+                    pulses[n] = (short)(pulses[n] * (short)CodeSigns.silk_dec_map(psRangeDec.dec_icdf(icdf, 8)));
+                }
+            }
+            q_ptr += 16;
+        }
+    }
+}
+