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86 lines
2.9 KiB
Java
86 lines
2.9 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.EntropyCoder;
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import de.maxhenkel.voicechat.concentus.Inlines;
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class Laplace {
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private static final int LAPLACE_LOG_MINP = 0;
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private static final long LAPLACE_MINP = 1L;
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private static final int LAPLACE_NMIN = 16;
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Laplace() {
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}
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static long ec_laplace_get_freq1(long fs0, int decay) {
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long ft = Inlines.CapToUInt32(32736L - fs0);
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return Inlines.CapToUInt32(ft * (long)(16384 - decay)) >> 15;
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}
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static void ec_laplace_encode(EntropyCoder enc, BoxedValueInt value, long fs, int decay) {
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int val = value.Val;
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long fl = 0L;
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if (val != 0) {
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int i;
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int s = 0 - (val < 0 ? 1 : 0);
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val = val + s ^ s;
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fl = fs;
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fs = Laplace.ec_laplace_get_freq1(fs, decay);
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for (i = 1; fs > 0L && i < val; ++i) {
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fl = Inlines.CapToUInt32(fl + (fs *= 2L) + 2L);
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fs = Inlines.CapToUInt32(fs * (long)decay >> 15);
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}
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if (fs == 0L) {
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int ndi_max = (int)(32768L - fl + 1L - 1L) >> 0;
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ndi_max = ndi_max - s >> 1;
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int di = Inlines.IMIN(val - i, ndi_max - 1);
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fl = Inlines.CapToUInt32(fl + (long)(2 * di + 1 + s) * 1L);
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fs = Inlines.IMIN(1L, 32768L - fl);
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value.Val = i + di + s ^ s;
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} else {
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fl += Inlines.CapToUInt32(++fs & (long)(~s));
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}
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Inlines.OpusAssert(fl + fs <= 32768L);
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Inlines.OpusAssert(fs > 0L);
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}
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enc.encode_bin(fl, fl + fs, 15);
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}
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static int ec_laplace_decode(EntropyCoder dec, long fs, int decay) {
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int val = 0;
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long fm = dec.decode_bin(15);
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long fl = 0L;
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if (fm >= fs) {
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++val;
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fl = fs;
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fs = Laplace.ec_laplace_get_freq1(fs, decay) + 1L;
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while (fs > 1L && fm >= fl + 2L * fs) {
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fl = Inlines.CapToUInt32(fl + (fs *= 2L));
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fs = Inlines.CapToUInt32((fs - 2L) * (long)decay >> 15);
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++fs;
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++val;
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}
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if (fs <= 1L) {
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int di = (int)(fm - fl) >> 1;
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val += di;
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fl = Inlines.CapToUInt32(fl + Inlines.CapToUInt32((long)(2 * di) * 1L));
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}
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if (fm < fl + fs) {
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val = -val;
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} else {
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fl = Inlines.CapToUInt32(fl + fs);
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}
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}
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Inlines.OpusAssert(fl < 32768L);
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Inlines.OpusAssert(fs > 0L);
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Inlines.OpusAssert(fl <= fm);
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Inlines.OpusAssert(fm < Inlines.IMIN(fl + fs, 32768L));
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dec.dec_update(fl, Inlines.IMIN(fl + fs, 32768L), 32768L);
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return val;
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}
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}
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