seek method
Seeks to the specified sampleIndex position frame in the file.
Implementation
void seek(int sampleIndex) {
if (_isClosed) throw StateError("WavReader is closed");
if (sampleIndex < 0 || sampleIndex > totalSamples) {
throw RangeError.range(sampleIndex, 0, totalSamples, "sampleIndex");
}
_currentSample = sampleIndex;
file.setPositionSync(_dataStartOffset + sampleIndex * format.blockAlign);
}