Question

JavaScript => public static var dspTime: double;
C# => public static double dspTime;

Description 描述

Returns the current time of the audio system.

返回音频系统的运行时间。

This is a value specified in seconds and based on the actual number of samples the audio system processes and is therefore much more precise than the time obtained via the Time.time property.

这个值以秒为单位，根据的音频系统中音频播放的的实际的值得出，因此比由Time.time属性所获得的时间更精确。

JavaScript:

// The code example shows how to implement a metronome that procedurally generates the click sounds via the OnAudioFilterRead callback.
//这段代码展示了，如何通过OnAudioFilterRead回调播放“咔嗒声”来实现一个节拍器。
// While the game is paused or the suspended, this time will not be updated and sounds playing will be paused. Therefore developers of music scheduling routines do not have to do any rescheduling after the app is unpaused 
//当这个游戏被暂停或着挂起时，这个时间点（PS：暂停的位置）不会被刷新并且声音播放将会暂停。因此在暂停终止时（再次开启）音乐开发者不需要做任何的事情来重新安排。
@script RequireComponent(AudioSource)
 
public var bpm : double = 140.0;
public var gain : float = 0.5f;
public var signatureHi : int = 4;
public var signatureLo : int = 4;
 
private var nextTick : double = 0.0;
private var amp : float = 0.0f;
private var phase : float = 0.0f;
private var sampleRate : double = 0.0;
private var accent : int;
private var running : boolean = false;
 
function Start ()
{
    accent = signatureHi;
    var startTick = AudioSettings.dspTime;
    sampleRate = AudioSettings.outputSampleRate;
    nextTick = startTick * sampleRate;
    running = true;
}
 
function OnAudioFilterRead(data:float[], channels:int)
{
    if(!running)
        return;
    var samplesPerTick = sampleRate * (60.0f / bpm) * (4.0 / signatureLo);
    var sample = AudioSettings.dspTime * sampleRate;
    var dataLen = data.length / channels;
    for(var n = 0; n < dataLen; n++)
    {
        var x : float = gain * amp * Mathf.Sin(phase);
        for(var i = 0; i < channels; i++)
            data[n * channels + i] += x;
        while (sample + n >= nextTick)
        {
            nextTick += samplesPerTick;
            amp = 1.0;
            if(++accent > signatureHi)
            {
                accent = 1;
                amp *= 2.0;
            }
            Debug.Log("Tick: " + accent + "/" + signatureHi);
        }
        phase += amp * 0.3;
        amp *= 0.993;
    }
}

C#:

using UnityEngine;
using System.Collections;
 
// The code example shows how to implement a metronome that procedurally generates the click sounds via the OnAudioFilterRead callback.
// While the game is paused or the suspended, this time will not be updated and sounds playing will be paused. Therefore developers of music scheduling routines do not have to do any rescheduling after the app is unpaused 
 
[RequireComponent(typeof(AudioSource))]
public class ExampleClass : MonoBehaviour
{
	public double bpm = 140.0F;
	public float gain = 0.5F;
	public int signatureHi = 4;
	public int signatureLo = 4;
	private double nextTick = 0.0F;
	private float amp = 0.0F;
	private float phase = 0.0F;
	private double sampleRate = 0.0F;
	private int accent;
	private bool running = false;
	void Start()
	{
		accent = signatureHi;
		double startTick = AudioSettings.dspTime;
		sampleRate = AudioSettings.outputSampleRate;
		nextTick = startTick * sampleRate;
		running = true;
	}
	void OnAudioFilterRead(float[] data, int channels)
	{
		if (!running)
			return;
 
		double samplesPerTick = sampleRate * 60.0F / bpm * 4.0F / signatureLo;
		double sample = AudioSettings.dspTime * sampleRate;
		int dataLen = data.Length / channels;
		int n = 0;
		while (n < dataLen)
		{
			float x = gain * amp * Mathf.Sin(phase);
			int i = 0;
			while (i < channels)
			{
				data[n * channels + i] += x;
				i++;
			}
			while (sample + n >= nextTick)
			{
				nextTick += samplesPerTick;
				amp = 1.0F;
				if (++accent > signatureHi)
				{
					accent = 1;
					amp *= 2.0F;
				}
				Debug.Log("Tick: " + accent + "/" + signatureHi);
			}
			phase += amp * 0.3F;
			amp *= 0.993F;
			n++;
		}
	}
}

AudioSettings