CrackMe.apk
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package com.google.android.exoplayer2.extractor.ts;
import com.google.android.exoplayer2.C;
import com.google.android.exoplayer2.Format;
import com.google.android.exoplayer2.audio.Ac3Util;
import com.google.android.exoplayer2.extractor.ExtractorOutput;
import com.google.android.exoplayer2.extractor.TrackOutput;
import com.google.android.exoplayer2.extractor.ts.TsPayloadReader;
import com.google.android.exoplayer2.util.Assertions;
import com.google.android.exoplayer2.util.ParsableBitArray;
import com.google.android.exoplayer2.util.ParsableByteArray;
import com.google.android.exoplayer2.util.Util;
import com.google.common.base.Ascii;
import org.checkerframework.checker.nullness.qual.RequiresNonNull;
public final class Ac3Reader implements ElementaryStreamReader {
private static final int HEADER_SIZE = 128;
private static final int STATE_FINDING_SYNC = 0;
private static final int STATE_READING_HEADER = 1;
private static final int STATE_READING_SAMPLE = 2;
private int bytesRead;
private Format format;
private String formatId;
private final ParsableBitArray headerScratchBits;
private final ParsableByteArray headerScratchBytes;
private final String language;
private boolean lastByteWas0B;
private TrackOutput output;
private long sampleDurationUs;
private int sampleSize;
private int state;
private long timeUs;
public void packetFinished() {
}
public Ac3Reader() {
this((String) null);
}
public Ac3Reader(String str) {
ParsableBitArray parsableBitArray = new ParsableBitArray(new byte[128]);
this.headerScratchBits = parsableBitArray;
this.headerScratchBytes = new ParsableByteArray(parsableBitArray.data);
this.state = 0;
this.timeUs = C.TIME_UNSET;
this.language = str;
}
public void seek() {
this.state = 0;
this.bytesRead = 0;
this.lastByteWas0B = false;
this.timeUs = C.TIME_UNSET;
}
public void createTracks(ExtractorOutput extractorOutput, TsPayloadReader.TrackIdGenerator trackIdGenerator) {
trackIdGenerator.generateNewId();
this.formatId = trackIdGenerator.getFormatId();
this.output = extractorOutput.track(trackIdGenerator.getTrackId(), 1);
}
public void packetStarted(long j, int i) {
if (j != C.TIME_UNSET) {
this.timeUs = j;
}
}
public void consume(ParsableByteArray parsableByteArray) {
Assertions.checkStateNotNull(this.output);
while (parsableByteArray.bytesLeft() > 0) {
int i = this.state;
if (i != 0) {
if (i != 1) {
if (i == 2) {
int min = Math.min(parsableByteArray.bytesLeft(), this.sampleSize - this.bytesRead);
this.output.sampleData(parsableByteArray, min);
int i2 = this.bytesRead + min;
this.bytesRead = i2;
int i3 = this.sampleSize;
if (i2 == i3) {
long j = this.timeUs;
if (j != C.TIME_UNSET) {
this.output.sampleMetadata(j, 1, i3, 0, (TrackOutput.CryptoData) null);
this.timeUs += this.sampleDurationUs;
}
this.state = 0;
}
}
} else if (continueRead(parsableByteArray, this.headerScratchBytes.getData(), 128)) {
parseHeader();
this.headerScratchBytes.setPosition(0);
this.output.sampleData(this.headerScratchBytes, 128);
this.state = 2;
}
} else if (skipToNextSync(parsableByteArray)) {
this.state = 1;
this.headerScratchBytes.getData()[0] = Ascii.VT;
this.headerScratchBytes.getData()[1] = 119;
this.bytesRead = 2;
}
}
}
private boolean continueRead(ParsableByteArray parsableByteArray, byte[] bArr, int i) {
int min = Math.min(parsableByteArray.bytesLeft(), i - this.bytesRead);
parsableByteArray.readBytes(bArr, this.bytesRead, min);
int i2 = this.bytesRead + min;
this.bytesRead = i2;
return i2 == i;
}
private boolean skipToNextSync(ParsableByteArray parsableByteArray) {
while (true) {
boolean z = false;
if (parsableByteArray.bytesLeft() <= 0) {
return false;
}
if (!this.lastByteWas0B) {
if (parsableByteArray.readUnsignedByte() == 11) {
z = true;
}
this.lastByteWas0B = z;
} else {
int readUnsignedByte = parsableByteArray.readUnsignedByte();
if (readUnsignedByte == 119) {
this.lastByteWas0B = false;
return true;
}
if (readUnsignedByte == 11) {
z = true;
}
this.lastByteWas0B = z;
}
}
}
@RequiresNonNull({"output"})
private void parseHeader() {
this.headerScratchBits.setPosition(0);
Ac3Util.SyncFrameInfo parseAc3SyncframeInfo = Ac3Util.parseAc3SyncframeInfo(this.headerScratchBits);
if (this.format == null || parseAc3SyncframeInfo.channelCount != this.format.channelCount || parseAc3SyncframeInfo.sampleRate != this.format.sampleRate || !Util.areEqual(parseAc3SyncframeInfo.mimeType, this.format.sampleMimeType)) {
Format build = new Format.Builder().setId(this.formatId).setSampleMimeType(parseAc3SyncframeInfo.mimeType).setChannelCount(parseAc3SyncframeInfo.channelCount).setSampleRate(parseAc3SyncframeInfo.sampleRate).setLanguage(this.language).build();
this.format = build;
this.output.format(build);
}
this.sampleSize = parseAc3SyncframeInfo.frameSize;
this.sampleDurationUs = (((long) parseAc3SyncframeInfo.sampleCount) * 1000000) / ((long) this.format.sampleRate);
}
}
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