public static SampleSoundGenerator ImportFromVorbis(SampleGeneratingArgs args)
{
var generator = new SampleSoundGenerator(new VorbisWaveReader(args.Path))
{
VolumeCorrection = (float)args.Volume
};
return(generator);
}
private static SampleSoundGenerator GetSampleContinuous(SampleHeader sh, Zone izone, byte[] sample, SampleGeneratingArgs args)
{
// Indices in sf2 are numbers of samples, not byte length. So double them
int start = (int)sh.Start + izone.FullStartAddressOffset();
int end = (int)sh.End + izone.FullEndAddressOffset();
int startLoop = (int)sh.StartLoop + izone.FullStartLoopAddressOffset();
int endLoop = (int)sh.EndLoop + izone.FullEndLoopAddressOffset();
int length = end - start;
int lengthBytes = length * 2;
int loopLength = endLoop - startLoop;
int loopLengthBytes = loopLength * 2;
double lengthInSeconds = args.Length != -1 ? (args.Length / 1000) + 0.4 : length / (double)sh.SampleRate + 0.4;
// Sample rate key correction
int keyCorrection = args.Key != -1 ? args.Key - izone.Key() : 0;
double factor = Math.Pow(2, keyCorrection / 12d);
lengthInSeconds *= factor;
int numberOfSamples = (int)Math.Ceiling(lengthInSeconds * sh.SampleRate);
int numberOfLoopSamples = numberOfSamples - length;
if (numberOfLoopSamples < 0)
{
return(GetSampleWithoutLoop(sh, izone, sample, args));
}
int numberOfBytes = numberOfSamples * 2;
byte[] buffer = new byte[numberOfBytes];
Array.Copy(sample, start * 2, buffer, 0, lengthBytes);
for (int i = 0; i < (numberOfLoopSamples + loopLength - 1) / loopLength; i++)
{
Array.Copy(sample, startLoop * 2, buffer, lengthBytes + i * loopLengthBytes, Math.Min(loopLengthBytes, numberOfBytes - (lengthBytes + i * loopLengthBytes)));
}
var output = new SampleSoundGenerator(BufferToWaveStream(buffer, (uint)(sh.SampleRate * factor)))
{
FadeStart = lengthInSeconds - 0.4,
FadeLength = 0.3
};
return(output);
}
public static SampleSoundGenerator ImportSample(SampleGeneratingArgs args)
{
string path = args.Path;
switch (Path.GetExtension(path))
{
case ".sf2": {
SoundFont sf2 = new SoundFont(path);
SampleSoundGenerator wave = ImportFromSoundFont(args, sf2);
GC.Collect();
return(wave);
}
case ".ogg":
return(ImportFromVorbis(args));
default:
return(ImportFromAudio(args));
}
}
public static SampleSoundGenerator ImportSample(SampleGeneratingArgs args)
{
string path = args.Path;
if (Path.GetExtension(path) == ".sf2")
{
SoundFont sf2 = new SoundFont(path);
SampleSoundGenerator wave = ImportFromSoundFont(args, sf2);
GC.Collect();
return(wave);
}
else if (Path.GetExtension(path) == ".ogg")
{
return(ImportFromVorbis(args));
}
else
{
return(ImportFromAudio(args));
}
}
private static SampleSoundGenerator GetSampleWithoutLoop(SampleHeader sh, Zone izone, byte[] sample, SampleGeneratingArgs args)
{
// Indices in sf2 are numbers of samples, not byte length. So double them
int start = (int)sh.Start + izone.FullStartAddressOffset();
int end = (int)sh.End + izone.FullEndAddressOffset();
int length = end - start;
double lengthInSeconds = args.Length != -1 ? (args.Length / 1000) + 0.4 : length / (double)sh.SampleRate;
// Sample rate key correction
int keyCorrection = args.Key != -1 ? args.Key - izone.Key() : 0;
double factor = Math.Pow(2, keyCorrection / 12d);
lengthInSeconds *= factor;
lengthInSeconds = Math.Min(lengthInSeconds, length / (double)sh.SampleRate);
int numberOfSamples = (int)Math.Ceiling(lengthInSeconds * sh.SampleRate);
int numberOfBytes = numberOfSamples * 2;
byte[] buffer = new byte[numberOfBytes];
Array.Copy(sample, start * 2, buffer, 0, numberOfBytes);
var output = new SampleSoundGenerator(BufferToWaveStream(buffer, (uint)(sh.SampleRate * factor)));
if (lengthInSeconds <= 0.4)
{
output.FadeStart = lengthInSeconds * 0.7;
output.FadeLength = lengthInSeconds * 0.2;
}
else
{
output.FadeStart = lengthInSeconds - 0.4;
output.FadeLength = 0.3;
}
return(output);
}
// TODO: format soundfont import to detect file versions and types of files.
public static SampleSoundGenerator ImportFromSoundFont(SampleGeneratingArgs args, SoundFont sf2)
{
SampleSoundGenerator wave = null;
foreach (var preset in sf2.Presets)
{
if (preset.PatchNumber != args.Patch && args.Patch != -1)
{
continue;
}
if (preset.Bank != args.Bank && args.Bank != -1)
{
continue;
}
wave = ImportPreset(sf2, preset, args);
if (wave != null)
{
break;
}
}
return(wave ?? ImportInstruments(sf2, args));
}