// Generate beats
void PlaceBeats()
{
notes.Clear();
// Screen percentages
markerPosX = (int)(graphics.PreferredBackBufferWidth * MARKER_POS);
int halfScreenHeight = graphics.PreferredBackBufferHeight / 2;
// Go through the list of onsets detected
for (int itemNo = 0; itemNo < audioAnalysis.GetOnsets().Length; itemNo++)
{
// Retrieve the item from the audio analysis onset detected list
float onset = audioAnalysis.GetOnsets()[itemNo];
// If the item is an onset
if (onset > 0.0)
{
GameObject newNote = new GameObject(beatTexture);
// Set the origin of the note in the centre
newNote.Origin = Vector2.One * beatTexture.Height / 2;
// Length of time each item in the onset detected list represents
float timePos = audioAnalysis.GetTimePerSample();
// Place the note in accordance to its position in the song
float xPosition = (itemNo * timePos);
// Stretch the timeline so the notes aren't bunch up
xPosition *= PIXELS_SECOND;
// Add an offset, the marker represents the current position in the song
xPosition += markerPosX;
// Set the note in the correct position
newNote.Position = new Vector2(xPosition, halfScreenHeight);
// Set the note moving towards the left
newNote.Velocity = new Vector2(-PIXELS_SECOND, 0);
if (onset > 0.5f)
{
newNote.TintColor = Color.Orange;
}
else
{
newNote.TintColor = Color.MediumPurple;
}
notes.Add(newNote);
}
}
}
public Song(string fileDirectory)
{
#region cppAnalyzerOld
/*var FloatSamples = Utilities.FloatArrayFromAudio(fileDirectory).ToArray();
* Process audioAnalyzer = new Process();
* string path = @"AubioAnalyzerCpp.exe";
* string currDirectory = Directory.GetCurrentDirectory();
* audioAnalyzer.StartInfo = new ProcessStartInfo(path, '"' + Directory.GetCurrentDirectory() + "\" " + FloatSamples.Length)
* {
* UseShellExecute = false,
* RedirectStandardInput = true,
* RedirectStandardOutput = true,
* };
* audioAnalyzer.Start();
* foreach (float sample in FloatSamples) {
* audioAnalyzer.StandardInput.WriteLine(sample);
* }
*
* string BPMString = audioAnalyzer.StandardOutput.ReadToEnd();
* BeatsPerMinute = (float)Convert.ToDouble(BPMString);
* audioAnalyzer.WaitForExit();
* if (audioAnalyzer.ExitCode != 0) throw new Exception("Audio Analyzer Failed");*/
#endregion cppAnalyzerOld
AudioAnalysis analyzer = new AudioAnalysis();
analyzer.LoadAudioFromFile(fileDirectory);
analyzer.DetectOnsets(out fluxes);
//BPMDetector bpmdet = new BPMDetector(fileDirectory);
//BeatsPerMinute = bpmdet.getBPM();
//msTilStart = bpmdet.getOffset();
Onsets = analyzer.GetOnsets().ToList();
TimePerSample = analyzer.GetTimePerSample();
}
public void Initialize(ISampleSource soundSource, GeneratorOptions options)
{
analysis = new AudioAnalysis();
analysis.PCMStream = soundSource;
analysis.DetectOnsets();
analysis.NormalizeOnsets(0);
analysis.PCMStream.Position = 0;
fps = options.Fps;
Console.WriteLine("Audio analyzer detected " + analysis.GetOnsets().Count(f => f > 0) + " onsets!");
}
public void Apply(IRenderer renderer, Frame frame)
{
var frameTime = frame.Time.TotalSeconds;
var num = 0;
var maxTimespan = (1.0d / fps) * maxFrames;
foreach (var onset in analysis.GetOnsets())
{
if (onset > 0.04)
{
float timePos = num * analysis.GetTimePerSample();
var timeDiff = Math.Abs(frameTime - timePos);
if (timeDiff <= maxTimespan)
{
var onsetMultiplier = Math.Min(1.0, onset + 0.5);
var timeProgress = timeDiff / maxTimespan;
renderer.DrawRect(new Rectangle(0, 0, 1920, 1080), Color.FromArgb((int)(255.0f * intensity * timeProgress * onsetMultiplier), 255, 255, 255));
return;
}
}
num++;
}
}
