/// <summary>
/// Converts audio data into a binary format by squaring off the data.
/// </summary>
///
/// <param name="data">The data to convert.</param>
/// <returns>The converted data.</returns>
public BinaryData ConvertToSquare(SoundData data)
{
Int16[] sample = new Int16[4];
List<bool> binData = new List<bool>();
IEnumerator<Int16> audio = data.GetEnumerator();
bool end = false;
while (true) {
for (int i = 0; i < 4; ++i) {
if (audio.MoveNext()) {
sample[i] = audio.Current;
} else {
end = true;
break;
}
}
if (end) {
break;
}
bool[] sizes = NormalizeSample(audio, sample);
// After all that, all we really need is the third value.
binData.Add(sizes[2]);
}
return new BinaryData(binData);
}
public void TestEnumerator()
{
Int16[] data = {
1, 2, 3, 4, 5, 6, 7, 8, 9, 10
};
SoundData audio = new SoundData(new List<Int16>(data));
IEnumerator<Int16> ie = audio.GetEnumerator();
for (int i = 0; i < data.Length; ++i) {
ie.MoveNext();
Assert.AreEqual(data[i], ie.Current, "Enumerator values.");
}
}
public CassetteData[] ChunkData(SoundData data)
{
IEnumerator<Int16> ie = data.GetEnumerator();
float average = 0;
int count = 0;
ie.MoveNext();
List<CassetteData> chunks = new List<CassetteData>();
MetaData meta = null;
do {
Int16 level = ie.Current, abs = Math.Abs(level);
int rate;
// Eat a little first to even out the average, then start checking.
if (count >= IgnoreHead) {
if (level > 5 * average && (rate = FindLeader(ie)) > 0) {
if (meta == null) {
MetaParser parser = new MetaParser(ie, rate);
meta = (MetaData) parser.Parse();
} else {
ProgramParser parser = new ProgramParser(ie, rate,
meta.ProgramSize);
ProgramData program = (ProgramData) parser.Parse();
chunks.Add(new CassetteData(meta, program));
meta = null;
}
rate = count = 0;
}
}
// Don't let data or spikes screw up our noise muffler.
if (count < IgnoreHead || !(abs > 5 * average)) {
average = (average * count + abs) / ++count;
} else {
count++;
}
} while (ie.MoveNext());
CassetteData[] output = new CassetteData[chunks.Count];
for (int i = 0; i < output.Length; ++i) {
output[i] = chunks[i];
}
return output;
}
