/// <summary>
/// Trims noise off of the front of the given sound data.
/// </summary>
///
/// <remarks>
/// This is also the first method call in the pipeline, so calling this
/// method will continue the pipeline, cutting out the desired chunks and
/// returning all the way back with them.
/// </remarks>
///
/// <param name="data">The data to trim.</param>
private List<SoundData> TrimNoise(SoundData.SoundEnumerator ie)
{
List<SoundData> chunks = new List<SoundData>();
float average = 0;
int count = 0;
ie.MoveNext();
do {
Int16 level = ie.Current, abs = Math.Abs(level);
// Eat a little first to even out the average, then start checking.
if (count >= AVERAGE_COUNT) {
if (abs > 5 * average && IsLeader(ie)) {
chunks.Add(RipChunk(ie, average));
}
}
// Don't let data or spikes screw up our noise muffler.
if (count < AVERAGE_COUNT || !(abs > 5 * average)) {
average = (average * count + abs) / ++count;
} else {
count++;
}
} while (ie.MoveNext());
return chunks;
}