Unity Waveform UI with customizable resolution

EditorUtil.Waveform.cs

/*
// UI inspector example implementation
Rect waveformRect = GUILayoutUtility.GetRect(waveformSize.x, waveformSize.y, GUIStyle.none);
EditorUtil.Waveform(waveformRect, clip, waveformSize);

float playMarker = 0f; // replace with a 0-1 seek position
if (playMarker >= 0f) {
	Rect progressRect = new Rect(waveformRect);
	float width = progressRect.width * playMarker;
	progressRect.width = Mathf.Clamp(width, 6, width);
	GUI.Box(progressRect, "", "SelectionRect");
}
*/

// UI method implementation
public class EditorUtil
{
	public static void Waveform(Rect waveformRect, AudioClip clip, Vector2 size, float playMarker = -1f, float[] beatMarkers = null, int downBeat = 0)
	{
		// can't load data when audio is set to streaming
		if(clip.loadState != AudioDataLoadState.Loaded)
			clip.LoadAudioData();
		// only do expensive calcs on repaint
		if (Event.current.type != EventType.Repaint)
			return;
		Texture2D waveformTexture = GetWaveformTexture(clip, size); // AssetPreview.GetAssetPreview(clip);
		if (waveformTexture == null)
			return;
		GUIStyle tempStyle = new GUIStyle();
		tempStyle.normal.background = waveformTexture;
		tempStyle.Draw(waveformRect, GUIContent.none, false, false, false, false);
	}

	private static Color waveformBG = new Color(0.25f, 0.25f, 0.25f);
	private static Color waveformColor = new Color(1f, 0.6f, 0.2f);
	public static Texture2D GetWaveformTexture(AudioClip clip, Vector2 size) {
		// get sample data
		float[] samples = new float[clip.samples * clip.channels];
		if (clip.GetData(samples, 0) == false)
			return null;
		// setup texture
		int width = (int) size.x;
		int height = (int) size.y;
		Texture2D texture = new Texture2D(width, height);
		// get sampleIntensity
		int resolution = clip.samples / width;
		// draw color arracy per pixel in width
		Color[] colors = new Color[height];
		float midHeight = height / 2f;
		float sampleComp = 0f;
		for (int i = 0; i < width; i++) {
			// get wave intensity
			float sampleChunk = 0;
			for (int ii = 0; ii < resolution; ii++)
				sampleChunk += Mathf.Abs(samples[(i * resolution) + ii]);
			sampleChunk = sampleChunk / resolution * 1.5f;
			for (int h = 0; h < height; h++) {
				// get value of height relative to totalHeight
				if (h < midHeight)
					sampleComp = Mathf.InverseLerp(midHeight, 0, h);
				else
					sampleComp = Mathf.InverseLerp(midHeight, height, h);
				// corralate to sample height
				if (sampleComp > sampleChunk)
					colors[h] = waveformBG;
				else
					colors[h] = waveformColor;
			}
			// set pixels
			texture.SetPixels(i, 0, 1, height, colors);
		}
		// push to graphics card
		texture.Apply();
		// return finished texture
		return texture;
	}
}