protected virtual Task <TransformResult> Transform(TransformSource source)
{
int length = (int)source.Memory.Length;
var memory = source.Alloc(length);
source.Memory.CopyTo(memory.Span);
source.Consumed = source.Memory.End;// GetPosition(length);
var transformed = Transform(memory.Span);
var transformResult = new TransformResult()
{
Result = transformed,
Written = transformed.Length,
};
////using (var fs = System.IO.File.Open("sample-aaa.wav", System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write))
////{
//// fs.Seek(0, System.IO.SeekOrigin.End);
//// fs.Write(buffer, 0, length);
////}
////var transformResult = new TransformResult()
////{
//// Result = buffer.AsMemory(),
//// Written = length,
////};
return(Task.FromResult(transformResult));
}
protected override Task <TransformResult> Transform(TransformSource source)
{
int length = (int)source.Memory.Length;
var buffer = source.Alloc(length);
source.Consumed = source.Memory.GetPosition(length);
var start = 0;
foreach (var segment in source.Memory)
{
// write the log (append mode)
using (var fs = File.Open(Filename, FileMode.OpenOrCreate, FileAccess.Write))
{
fs.Seek(0, SeekOrigin.End);
fs.Write(segment.Span);
}
segment.CopyTo(buffer.Slice(start));
start += segment.Length;
}
var transformResult = new TransformResult()
{
Result = buffer.Slice(0, length),
Written = length,
};
return(Task.FromResult(transformResult));
}
protected override Task <TransformResult> Transform(TransformSource source)
{
var length = (int)source.Memory.Length;
source.Consumed = source.Memory.End;
var memory = source.Alloc(length * 4);
var spanFloats = MemoryMarshal.Cast <byte, float>(memory.Span);
// Instead of just copying the byte array to floats ...
//Utilities.CopyToFloat(source.Memory, spanFloats, length);
// ... we constrain the value of the float array to the interval [-1, +1)
int offset = 0;
foreach (var segment in source.Memory)
{
for (int i = 0; i < segment.Length; i++)
{
if (offset >= length) // target.Length
{
break;
}
var input = segment.Span;
//spanFloats[offset] = input[i];
b_min = Math.Min(b_min, input[i]);
b_max = Math.Max(b_max, input[i]);
// TODO: this version is handling only 8 bit per sample
//temp[offset] = input[i] / 32768f;
//temp[offset] = input[i] / 256f;
spanFloats[offset] = (input[i] - 128) / 128.0f;
b2_min = Math.Min(b2_min, spanFloats[offset]);
b2_max = Math.Max(b2_max, spanFloats[offset]);
offset++;
}
}
// finally we return the byte[] representation of our floats
var transformResult = new TransformResult()
{
Result = memory,
Written = memory.Length,
};
return(Task.FromResult(transformResult));
}
protected override Task <TransformResult> Transform(TransformSource source)
{
var length = (int)source.Memory.Length;
source.Consumed = source.Memory.End;
var output = source.Alloc(length / 4);
var outSpan = output.Span;
int offset = 0;
float dataOffset = 1.4f;//(b2_max - b2_min) / 2;
foreach (var segment in source.Memory)
{
var dataSource = MemoryMarshal.Cast <byte, float>(segment.Span);
for (int i = 0; i < dataSource.Length; i++)
{
if (offset >= length) // target.Length
{
break;
}
var input = segment.Span;
a_min = Math.Min(a_min, dataSource[i]);
a_max = Math.Max(a_max, dataSource[i]);
//outSpan[offset] = (byte)((dataSource[i] - 0.5f) * 8192);
//outSpan[offset] = (byte)((dataSource[i]) * 150.0f);
//outSpan[offset] = (byte)((dataSource[i] + 1.0f) * 12/8.0f);
outSpan[offset] = (byte)((dataSource[i] + dataOffset) * (256.0f / (2 * dataOffset)));
a2_min = Math.Min(a2_min, outSpan[offset]);
a2_max = Math.Max(a2_max, outSpan[offset]);
offset++;
}
}
// end
var transformResult = new TransformResult()
{
Result = output,
Written = output.Length,
};
return(Task.FromResult(transformResult));
}