CrackMe.apk

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    package com.google.android.exoplayer2.audio;

import com.google.android.exoplayer2.C;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.List;

public class OpusUtil {
    private static final int DEFAULT_SEEK_PRE_ROLL_SAMPLES = 3840;
    private static final int FULL_CODEC_INITIALIZATION_DATA_BUFFER_COUNT = 3;
    public static final int SAMPLE_RATE = 48000;

    private OpusUtil() {
    }

    public static int getChannelCount(byte[] bArr) {
        return bArr[9] & 255;
    }

    public static List<byte[]> buildInitializationData(byte[] bArr) {
        long sampleCountToNanoseconds = sampleCountToNanoseconds((long) getPreSkipSamples(bArr));
        long sampleCountToNanoseconds2 = sampleCountToNanoseconds(3840);
        ArrayList arrayList = new ArrayList(3);
        arrayList.add(bArr);
        arrayList.add(buildNativeOrderByteArray(sampleCountToNanoseconds));
        arrayList.add(buildNativeOrderByteArray(sampleCountToNanoseconds2));
        return arrayList;
    }

    private static int getPreSkipSamples(byte[] bArr) {
        return (bArr[10] & 255) | ((bArr[11] & 255) << 8);
    }

    private static byte[] buildNativeOrderByteArray(long j) {
        return ByteBuffer.allocate(8).order(ByteOrder.nativeOrder()).putLong(j).array();
    }

    private static long sampleCountToNanoseconds(long j) {
        return (j * C.NANOS_PER_SECOND) / 48000;
    }
}
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