From 310fd066e91f454b990372ffa30e803cc8120975 Mon Sep 17 00:00:00 2001 From: Florian Merz Date: Thu, 11 Feb 2021 12:56:40 +0100 Subject: unslug zh-cn: move --- .../api/baseaudiocontext/createdelay/index.html | 213 +++++++++++++++++++++ 1 file changed, 213 insertions(+) create mode 100644 files/zh-cn/web/api/baseaudiocontext/createdelay/index.html (limited to 'files/zh-cn/web/api/baseaudiocontext/createdelay') diff --git a/files/zh-cn/web/api/baseaudiocontext/createdelay/index.html b/files/zh-cn/web/api/baseaudiocontext/createdelay/index.html new file mode 100644 index 0000000000..b8e502758d --- /dev/null +++ b/files/zh-cn/web/api/baseaudiocontext/createdelay/index.html @@ -0,0 +1,213 @@ +--- +title: AudioContext.createDelay() +slug: Web/API/AudioContext/createDelay +translation_of: Web/API/BaseAudioContext/createDelay +--- +

{{ APIRef("Web Audio API") }}

+ +
+

  createDelay() 是  {{ domxref("AudioContext") }}   的一个方法，作用是将输入音频信号延迟一定时间。（比如可以实现 对着话筒说句话，然后几秒后 这句话从音响里播放出来）

+ +

 

+
+ +

语法

+ +
var audioCtx = new AudioContext();
+var synthDelay = audioCtx.createDelay(maxDelayTime);
+ +

参数

+ +
+
maxDelayTime
+
设置最大允许延迟的时间，以“秒”为单位
+
+ +

返回

+ +

A {{domxref("DelayNode")}}. The default {{domxref("DelayNode.delayTime")}} if no parameter is passed to createDelay() is 0 seconds.

+ +

以上是原文，大意是返回延时时间，没有设置时默认是0

+ +

 

+ +

示例

+ +

首先是中文版的简洁的示例，这个例子中 话筒里接收到的声音 会延迟3秒 从音响中播放

+ +
window.AudioContext = window.AudioContext || window.webkitAudioContext || window.mozAudioContext || window.msAudioContext;
+
+try {//音频相关api
+    var audioContext = new window.AudioContext();
+    var synthDelay = audioContext.createDelay(5.0);
+} catch (e) {
+    alert("你浏览器不支持");
+}
+
+
+var error = function (error) {alert("有错误"); };
+
+//以下是获取麦克风
+if (navigator.getUserMedia) { //标准api
+ navigator.getUserMedia({ "audio": true },
+ function (stream) {
+ micto(stream);    //具体工作
+                   }, error);
+}else if(navigator.webkitGetUserMedia) {   //webkit api
+ navigator.webkitGetUserMedia({audio:true, video:  false },
+ function (stream) {
+  micto(stream); //具体工作
+                   }, error);
+ }else if (navigator.mozGetUserMedia) {  //火狐 api
+ navigator.mozGetUserMedia({ "audio": true },
+ function (stream) {
+  micto(stream);//具体工作
+                   }, error);
+ }else if (navigator.msGetUserMedia) { //ie api
+ navigator.msGetUserMedia({ "audio": true },
+ function (stream) {
+  micto(stream);//具体工作
+                   }, error);
+ } else {
+   alert("您的浏览器版不支持这个api");
+}
+
+
+
+
+
+ var micto = function(stream) {
+
+  synthDelay.delayTime.value = 3.0;   //延迟3秒
+
+  var source = audioContext.createMediaStreamSource(stream);
+
+  source.connect(synthDelay);
+
+  synthDelay.connect(audioContext.destination);
+
+      }
+
+ +

 

+ +

 以下是英文版示例

+ +

We have created a simple example that allows you to play three different samples on a constant loop — see create-delay (you can also view the source code). If you just press the play buttons, the loops will start immediately; if you slide the sliders up to the right, then press the play buttons, a delay will be introduced, so the looping sounds don't start playing for a short amount of time.

+ +
var AudioContext = window.AudioContext || window.webkitAudioContext;
+var audioCtx = new AudioContext();
+
+var synthDelay = audioCtx.createDelay(5.0);
+
+  ...
+
+var synthSource;
+
+playSynth.onclick = function() {
+  synthSource = audioCtx.createBufferSource();
+  synthSource.buffer = buffers[2];
+  synthSource.loop = true;
+  synthSource.start();
+  synthSource.connect(synthDelay);
+  synthDelay.connect(destination);
+  this.setAttribute('disabled', 'disabled');
+}
+
+stopSynth.onclick = function() {
+  synthSource.disconnect(synthDelay);
+  synthDelay.disconnect(destination);
+  synthSource.stop();
+  playSynth.removeAttribute('disabled');
+}
+
+...
+
+var delay1;
+rangeSynth.oninput = function() {
+delay1 = rangeSynth.value;
+synthDelay.delayTime.value = delay1;
+}
+
+ +

Specifications

+ + + + + + + + + + + + + + +
SpecificationStatusComment
{{SpecName('Web Audio API', '#widl-AudioContext-createDelay-DelayNode-double-maxDelayTime', 'createDelay()')}}{{Spec2('Web Audio API')}} 
+ +

Browser compatibility

+ +
{{CompatibilityTable}}
+ +
+ + + + + + + + + + + + + + + + + + + + + +
FeatureChromeEdgeFirefox (Gecko)Internet ExplorerOperaSafari (WebKit)
Basic support{{CompatChrome(10.0)}}{{property_prefix("webkit")}}{{CompatVersionUnknown}}{{CompatGeckoDesktop(25.0)}} {{CompatNo}}15.0{{property_prefix("webkit")}}
+ 22 (unprefixed)		6.0{{property_prefix("webkit")}}
+
+ +
+ + + + + + + + + + + + + + + + + + + + + + + + + +
FeatureAndroidEdgeFirefox Mobile (Gecko)Firefox OSIE MobileOpera MobileSafari MobileChrome for Android
Basic support{{CompatUnknown}}{{CompatVersionUnknown}}26.01.2{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}33.0
+
+ +

See also

+ + -- cgit v1.2.3-54-g00ecf