private static void ApplyFlatAttenuation(ArraySegment <float> frame, float volume)
{
if (frame.Array == null)
{
throw new ArgumentNullException("frame");
}
//Early exit in the (very common) case that volume is exactly 1
// ReSharper disable once CompareOfFloatsByEqualityOperator (Justification: exact float equality is what we want)
if (volume == 1)
{
return;
}
//Just clear the entire array in the (relatively common) case that volume is 0
// ReSharper disable once CompareOfFloatsByEqualityOperator (Justification: exact float equality is what we want)
if (volume == 0)
{
frame.Clear();
return;
}
//Apply the attenuation to the entire frame
for (int i = 0; i < frame.Count; i++)
{
frame.Array[frame.Offset + i] *= volume;
}
}
public int Decode(EncodedBuffer input, ArraySegment <float> output)
{
//Clear output buffer so that it just contains silence
output.Clear();
//Output the length of a frame
return(_frameSize);
}
public void IList_NotSupported()
{
var array = new long[] { 1, 2, 3, 4, 5, 6, -10 };
IList <long> s = new ArraySegment <long> (array, 2, 3);
try {
s.Add(1);
Assert.Fail("#1");
} catch (NotSupportedException) {
}
try {
s.Clear();
Assert.Fail("#2");
} catch (NotSupportedException) {
}
try {
s.Remove(3);
Assert.Fail("#3");
} catch (NotSupportedException) {
}
try {
s.RemoveAt(3);
Assert.Fail("#4");
} catch (NotSupportedException) {
}
try {
s.Insert(2, 3);
Assert.Fail("#5");
} catch (NotSupportedException) {
}
}
public bool Read(ArraySegment <float> samples)
{
var offset = samples.Offset;
var count = samples.Count;
Log.Trace("{0} samples requested", samples.Count);
while (count > 0)
{
// if we have data already buffered..
if (_firstSample < _lastSample)
{
// copy out what we need
var c = Math.Min(count, _lastSample - _firstSample);
Log.Trace("Transferring {0} buffered samples from previous read", c);
// ReSharper disable once AssignNullToNotNullAttribute (Justification: Array segment cannot be null)
Buffer.BlockCopy(_temp, _firstSample * sizeof(float), samples.Array, offset * sizeof(float), c * sizeof(float));
offset += c;
count -= c;
_firstSample += c;
// if that was the final frame, and we have read all of it
if (_upstreamComplete && _firstSample == _lastSample)
{
// pad the remainder with 0s if we didnt have enough
for (var i = offset; i < samples.Offset + samples.Count; i++)
{
samples.Array[i] = 0;
}
Log.Trace("Request satisfied ({0} samples provided with {1} samples 0-padded)", offset - samples.Offset, samples.Count - (offset - samples.Offset));
// return that we are complete
return(true);
}
}
// break if we have read enough
if (count == 0)
{
break;
}
// if we get here, then we need to read another frame
_firstSample = 0;
_lastSample = _temp.Length;
//If the upstream has already indicated that it is complete there's not a lot we can do!
//Clear the buffer and return zeroes
if (_upstreamComplete)
{
Log.Warn(Log.PossibleBugMessage("Attempting to read from a stream which has already finished", "C88903DE-17D4-4341-9AC6-28EB50BCFC8A"));
samples.Clear();
return(true);
}
Log.Trace("Reading frame ({0} samples)", _temp.Length);
_upstreamComplete = _source.Read(new ArraySegment <float>(_temp));
}
Log.Trace("Request satisfied ({0} samples provided)", offset - samples.Offset);
// return that there is more available
return(false);
}
public void IList_NotSupported ()
{
var array = new long[] { 1, 2, 3, 4, 5, 6, -10 };
IList<long> s = new ArraySegment<long> (array, 2, 3);
try {
s.Add (1);
Assert.Fail ("#1");
} catch (NotSupportedException) {
}
try {
s.Clear ();
Assert.Fail ("#2");
} catch (NotSupportedException) {
}
try {
s.Remove (3);
Assert.Fail ("#3");
} catch (NotSupportedException) {
}
try {
s.RemoveAt (3);
Assert.Fail ("#4");
} catch (NotSupportedException) {
}
try {
s.Insert (2, 3);
Assert.Fail ("#5");
} catch (NotSupportedException) {
}
}