public void drawWaveform(Rect rect, int channel, Vector2 visibleRange)
{
var minX = rect.x + rect.width * visibleRange.x;
var maxX = rect.x + rect.width * visibleRange.y;
var visibleRect = new Rect(minX, rect.y, maxX - minX, rect.height);
AudioCurveRendering.AudioMinMaxCurveAndColorEvaluator dlg = delegate(float x, out Color col, out float minValue, out float maxValue) {
col = Color.yellow;
x = Mathf.InverseLerp(rect.xMin, rect.xMax, Mathf.Lerp(minX, maxX, x));
var divisions = Mathf.FloorToInt(rect.width);
var groupIndex = Mathf.Clamp(Mathf.FloorToInt(x * divisions), min: 0, max: divisions - 1);
minMaxInInterval(groupIndex, divisions, channel, out minValue, out maxValue);
};
AudioCurveRendering.DrawMinMaxFilledCurve(visibleRect, dlg);
}
public static void DrawWaveForm(AudioClip clip, int channel, Rect position, float start, float length)
{
if (minMaxData != null && clip == storedClip)
{
var curveColor = new Color(255 / 255f, 168 / 255f, 7 / 255f);
int numChannels = clip.channels;
int numSamples = Mathf.FloorToInt(minMaxData.Length / (2f * numChannels) * (length / clip.length));
AudioCurveRendering.DrawMinMaxFilledCurve(
position,
delegate(float x, out Color col, out float minValue, out float maxValue) {
col = curveColor;
float p = Mathf.Clamp(x * (numSamples - 2), 0.0f, numSamples - 2);
int i = (int)Mathf.Floor(p);
float s = (start / clip.length) * Mathf.FloorToInt(minMaxData.Length / (2 * numChannels) - 2);
int si = (int)Mathf.Floor(s);
int offset1 = Mathf.Clamp(((i + si) * numChannels + channel) * 2, 0, minMaxData.Length - 2);
int offset2 = Mathf.Clamp(offset1 + numChannels * 2, 0, minMaxData.Length - 2);
minValue = Mathf.Min(minMaxData[offset1 + 1], minMaxData[offset2 + 1]);
maxValue = Mathf.Max(minMaxData[offset1 + 0], minMaxData[offset2 + 0]);
if (minValue > maxValue)
{
float tmp = minValue; minValue = maxValue; maxValue = tmp;
}
}
);
return;
}
// If execution has reached this point, the waveform data needs generating
var path = AssetDatabase.GetAssetPath(clip); if (path == null)
{
return;
}
var importer = AssetImporter.GetAtPath(path); if (importer == null)
{
return;
}
var assembly = Assembly.GetAssembly(typeof(AssetImporter)); if (assembly == null)
{
return;
}
var type = assembly.GetType("UnityEditor.AudioUtil"); if (type == null)
{
return;
}
var audioUtilGetMinMaxData = type.GetMethod("GetMinMaxData"); if (audioUtilGetMinMaxData == null)
{
return;
}
storedClip = clip;
minMaxData = audioUtilGetMinMaxData.Invoke(null, new object[] { importer }) as float[];
if (minMaxData == null)
{
return;
}
DrawWaveForm(clip, channel, position, start, length);
}
