Program: 55004
Project: 55004
Buggy source:
public int mixPacketIntoSamplePacket(byte[] packet,SamplePacket samplePacket,long channelFrequency){
  int mixFrequency=(int)(frequency - channelFrequency);
  if (mixFrequency == 0 || (sampleRate / Math.abs(mixFrequency) > MAX_COSINE_LENGTH))   mixFrequency+=sampleRate;
  if (cosineRealLookupTable == null || cosineFrequency != mixFrequency) {
    cosineFrequency=mixFrequency;
    double cycleLength=sampleRate / Math.abs((double)mixFrequency);
    int bestLength=(int)cycleLength;
    double bestLengthError=Math.abs(bestLength - cycleLength);
    for (int i=1; i * cycleLength < MAX_COSINE_LENGTH; i++) {
      if (Math.abs(i * cycleLength - (int)(i * cycleLength)) < bestLengthError) {
        bestLength=(int)(i * cycleLength);
        bestLengthError=Math.abs(bestLength - (i * cycleLength));
      }
    }
    Log.d(LOGTAG,"String_Node_Str" + mixFrequency + "String_Node_Str"+ bestLength+ "String_Node_Str"+ bestLengthError);
    cosineRealLookupTable=new double[bestLength][256];
    cosineImagLookupTable=new double[bestLength][256];
    double cosineAtT;
    double sineAtT;
    for (int t=0; t < bestLength; t++) {
      cosineAtT=Math.cos(2 * Math.PI * mixFrequency* t / (double)sampleRate);
      sineAtT=Math.sin(2 * Math.PI * mixFrequency* t / (double)sampleRate);
      for (int i=0; i < 256; i++) {
        cosineRealLookupTable[t][i]=(i - 128) / 128.0 * cosineAtT;
        cosineImagLookupTable[t][i]=(i - 128) / 128.0 * sineAtT;
      }
    }
    cosineIndex=0;
  }
  int capacity=samplePacket.capacity();
  int count=0;
  int startIndex=samplePacket.size();
  double[] re=samplePacket.re();
  double[] im=samplePacket.im();
  for (int i=0; i < packet.length; i+=2) {
    re[startIndex + count]=cosineRealLookupTable[cosineIndex][packet[i] + 128] - cosineImagLookupTable[cosineIndex][packet[i + 1] + 128];
    im[startIndex + count]=cosineRealLookupTable[cosineIndex][packet[i + 1] + 128] + cosineImagLookupTable[cosineIndex][packet[i] + 128];
    cosineIndex=(cosineIndex + 1) % cosineRealLookupTable.length;
    count++;
    if (startIndex + count >= capacity)     break;
  }
  samplePacket.setSize(samplePacket.size() + count);
  samplePacket.setSampleRate(sampleRate);
  samplePacket.setFrequency(frequency);
  return count;
}

Fixed version (ground truth):
public int mixPacketIntoSamplePacket(byte[] packet,SamplePacket samplePacket,long channelFrequency){
  int mixFrequency=(int)(frequency - channelFrequency);
  if (mixFrequency == 0 || (sampleRate / Math.abs(mixFrequency) > MAX_COSINE_LENGTH))   mixFrequency+=sampleRate;
  if (cosineRealLookupTable == null || cosineFrequency != mixFrequency) {
    cosineFrequency=mixFrequency;
    double cycleLength=sampleRate / Math.abs((double)mixFrequency);
    int bestLength=(int)cycleLength;
    double bestLengthError=Math.abs(bestLength - cycleLength);
    for (int i=1; i * cycleLength < MAX_COSINE_LENGTH; i++) {
      if (Math.abs(i * cycleLength - (int)(i * cycleLength)) < bestLengthError) {
        bestLength=(int)(i * cycleLength);
        bestLengthError=Math.abs(bestLength - (i * cycleLength));
      }
    }
    cosineRealLookupTable=new double[bestLength][256];
    cosineImagLookupTable=new double[bestLength][256];
    double cosineAtT;
    double sineAtT;
    for (int t=0; t < bestLength; t++) {
      cosineAtT=Math.cos(2 * Math.PI * mixFrequency* t / (double)sampleRate);
      sineAtT=Math.sin(2 * Math.PI * mixFrequency* t / (double)sampleRate);
      for (int i=0; i < 256; i++) {
        cosineRealLookupTable[t][i]=(i - 128) / 128.0 * cosineAtT;
        cosineImagLookupTable[t][i]=(i - 128) / 128.0 * sineAtT;
      }
    }
    cosineIndex=0;
  }
  int capacity=samplePacket.capacity();
  int count=0;
  int startIndex=samplePacket.size();
  double[] re=samplePacket.re();
  double[] im=samplePacket.im();
  for (int i=0; i < packet.length; i+=2) {
    re[startIndex + count]=cosineRealLookupTable[cosineIndex][packet[i] + 128] - cosineImagLookupTable[cosineIndex][packet[i + 1] + 128];
    im[startIndex + count]=cosineRealLookupTable[cosineIndex][packet[i + 1] + 128] + cosineImagLookupTable[cosineIndex][packet[i] + 128];
    cosineIndex=(cosineIndex + 1) % cosineRealLookupTable.length;
    count++;
    if (startIndex + count >= capacity)     break;
  }
  samplePacket.setSize(samplePacket.size() + count);
  samplePacket.setSampleRate(sampleRate);
  samplePacket.setFrequency(frequency);
  return count;
}