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;
}
public void WriteCassetteData(CassetteData data, string location)
{
Stream stream = GetStream(location);
BinaryWriter writer = new BinaryWriter(stream);
Console.WriteLine(SAMPLE_RATE);
int size = SAMPLE_RATE * 22 +
(88 * data.Program.Length + 59888) * WRITE_RATE;
// The "RIFF" chunk descriptor.
writer.Write("RIFF".ToCharArray());
writer.Write((Int32) (36 + size));
writer.Write("WAVE".ToCharArray());
// The "fmt" sub-chunk.
writer.Write("fmt ".ToCharArray());
writer.Write((Int32) 16);
writer.Write((Int16) 1);
writer.Write((Int16) 1);
writer.Write((Int32) SAMPLE_RATE);
writer.Write((Int32) SAMPLE_RATE * 2);
writer.Write((Int16) 16);
writer.Write((Int16) 16);
// The "data" sub-chunk.
writer.Write("data".ToCharArray());
writer.Write((Int32) size);
// 10 Seconds
for (int i = 0; i < SAMPLE_RATE * 10; ++i) {
writer.Write((Int16) 0);
}
// 3600 Bits
for (int i = 0; i < 3600; ++i) {
Write(writer, true);
}
// 1 Byte.
Write(writer, data.Meta.Key);
char[] name = data.Meta.FileName.ToCharArray();
if (name.Length > 16) {
throw new Exception("Filename of unexpected length.");
}
foreach (char c in name) {
Write(writer, (byte) c);
}
// 16 Bytes.
for (int i = name.Length; i < 16; ++i) {
Write(writer, (byte) ' ');
}
// 3 Bytes.
Write(writer, data.Meta.ProgramSize);
Write(writer, data.Meta.Parity);
// 2 Bytes.
Write(writer, (byte) 0);
Write(writer, (byte) 0);
// 1 Second.
for (int i = 0; i < SAMPLE_RATE; ++i) {
writer.Write((Int16) 0);
}
// 3600 Bits.
for (int i = 0; i < 3600; ++i) {
Write(writer, true);
}
// 1 Byte.
Write(writer, data.Program.Key);
// Program.Length Bytes.
foreach (byte b in data.Program) {
Write(writer, b);
}
// 1 Byte.
Write(writer, data.Program.Parity);
// 2 Bytes.
Write(writer, (byte) 0);
Write(writer, (byte) 0);
writer.Close();
stream.Close();
stream.Dispose();
}
