public static List <double> MergeSamples(
IList <double> stream1,
IList <double> stream2,
MergeFileAlgorithm algorithm = MergeFileAlgorithm.AverageX2
)
{
switch (algorithm)
{
case MergeFileAlgorithm.Average:
return(MergeSamplesAverage(stream1, stream2));
case MergeFileAlgorithm.AverageX2:
{
var raw = MergeSamplesAverage(stream1, stream2);
return(raw.Select(t => Math.Max(Math.Min(t * 2, 1), -1)).ToList());
}
case MergeFileAlgorithm.Sum:
return(MergeSamplesSum(stream1, stream2));
default:
throw new ArgumentOutOfRangeException(nameof(algorithm), algorithm, null);
}
}
public static WAVParser MergeFiles(
WAVParser file1,
WAVParser file2,
MergeFileAlgorithm algorithm = MergeFileAlgorithm.AverageX2
)
{
var realFile1 = file1.Clone();
var realFile2 = file2.Clone();
if (realFile1.SampleRate > realFile2.SampleRate)
{
realFile2 = ChangeSampleRate(realFile2, realFile1.SampleRate);
}
else if (realFile1.SampleRate < realFile2.SampleRate)
{
realFile1 = ChangeSampleRate(realFile1, realFile2.SampleRate);
}
var mergeMap = new List <List <int> >();
if (realFile1.ChannelCount == realFile2.ChannelCount)
{
for (int i = 0; i < realFile1.ChannelCount; i++)
{
mergeMap.Add(new List <int>()
{
i, i
});
}
}
else
{
if (realFile1.ChannelCount == 1)
{
for (int i = 0; i < realFile2.ChannelCount; i++)
{
mergeMap.Add(new List <int>()
{
0, i
});
}
}
else if (realFile2.ChannelCount == 1)
{
for (int i = 0; i < realFile1.ChannelCount; i++)
{
mergeMap.Add(new List <int>()
{
i, 0
});
}
}
else
{
throw new Exception(string.Format("File 1 has {0} channels. File 2 has {1} channels. Can't merge",
realFile1.ChannelCount, realFile2.ChannelCount));
}
}
var samples = new List <List <double> >();
foreach (var map in mergeMap)
{
var channel1 = realFile1.Samples[map[0]];
var channel2 = realFile2.Samples[map[1]];
samples.Add(MergeSamples(channel1, channel2, algorithm));
}
var newFile = realFile1.Clone();
newFile.Samples = samples;
return(newFile);
}
