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 --- .../audiocontext/createscriptprocessor/index.html | 199 --------------------- 1 file changed, 199 deletions(-) delete mode 100644 files/zh-cn/web/api/audiocontext/createscriptprocessor/index.html (limited to 'files/zh-cn/web/api/audiocontext/createscriptprocessor') diff --git a/files/zh-cn/web/api/audiocontext/createscriptprocessor/index.html b/files/zh-cn/web/api/audiocontext/createscriptprocessor/index.html deleted file mode 100644 index 7e505bc06a..0000000000 --- a/files/zh-cn/web/api/audiocontext/createscriptprocessor/index.html +++ /dev/null @@ -1,199 +0,0 @@ ---- -title: AudioContext.createScriptProcessor() -slug: Web/API/AudioContext/createScriptProcessor -translation_of: Web/API/BaseAudioContext/createScriptProcessor ---- -

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

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{{ domxref("AudioContext") }} 接口的createScriptProcessor() 方法创建一个{{domxref("ScriptProcessorNode")}} 用于通过JavaScript直接处理音频.

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语法

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var audioCtx = new AudioContext();
-myScriptProcessor = audioCtx.createScriptProcessor(bufferSize, numberOfInputChannels, numberOfOutputChannels);
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参数

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bufferSize
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缓冲区大小，以样本帧为单位。具体来讲，缓冲区大小必须是下面这些值当中的某一个: 256, 512, 1024, 2048, 4096, 8192, 16384. 如果不传，或者参数为0，则取当前环境最合适的缓冲区大小, 取值为2的幂次方的一个常数，在该node的整个生命周期中都不变.
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该取值控制着audioprocess事件被分派的频率，以及每一次调用多少样本帧被处理. 较低bufferSzie将导致一定的延迟。较高的bufferSzie就要注意避免音频的崩溃和故障。推荐作者不要给定具体的缓冲区大小，让系统自己选一个好的值来平衡延迟和音频质量。
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numberOfInputChannels
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值为整数，用于指定输入node的声道的数量，默认值是2，最高能取32.
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numberOfOutputChannels
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值为整数，用于指定输出node的声道的数量，默认值是2，最高能取32.
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重要: Webkit (version 31)要求调用这个方法的时候必须传入一个有效的bufferSize .

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注意: numberOfInputChannels和numberOfOutputChannels的值不能同时为0，二者同时为0是无效的

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返回

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A {{domxref("ScriptProcessorNode")}}.

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示例

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下面的例子展示了一个ScriptProcessorNode的基本用法，数据源取自 {{ domxref("AudioContext.decodeAudioData") }}, 给每一个音频样本加一点白噪声，然后通过{{domxref("AudioDestinationNode")}}播放(其实这个就是系统的扬声器)。 对于每一个声道和样本帧，在把结果当成输出样本之前，scriptNode.onaudioprocess方法关联audioProcessingEvent ，并用它来遍历每输入流的每一个声道，和每一个声道中的每一个样本，并添加一点白噪声。

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注意: 完整的示例参照 script-processor-node github (查看源码 source code.)

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var myScript = document.querySelector('script');
-var myPre = document.querySelector('pre');
-var playButton = document.querySelector('button');
-
-// Create AudioContext and buffer source
-var audioCtx = new AudioContext();
-source = audioCtx.createBufferSource();
-
-// Create a ScriptProcessorNode with a bufferSize of 4096 and a single input and output channel
-var scriptNode = audioCtx.createScriptProcessor(4096, 1, 1);
-console.log(scriptNode.bufferSize);
-
-// load in an audio track via XHR and decodeAudioData
-
-function getData() {
-  request = new XMLHttpRequest();
-  request.open('GET', 'viper.ogg', true);
-  request.responseType = 'arraybuffer';
-  request.onload = function() {
-    var audioData = request.response;
-
-    audioCtx.decodeAudioData(audioData, function(buffer) {
-    myBuffer = buffer;
-    source.buffer = myBuffer;
-  },
-    function(e){"Error with decoding audio data" + e.err});
-  }
-  request.send();
-}
-
-// Give the node a function to process audio events
-scriptNode.onaudioprocess = function(audioProcessingEvent) {
-  // The input buffer is the song we loaded earlier
-  var inputBuffer = audioProcessingEvent.inputBuffer;
-
-  // The output buffer contains the samples that will be modified and played
-  var outputBuffer = audioProcessingEvent.outputBuffer;
-
-  // Loop through the output channels (in this case there is only one)
-  for (var channel = 0; channel < outputBuffer.numberOfChannels; channel++) {
-    var inputData = inputBuffer.getChannelData(channel);
-    var outputData = outputBuffer.getChannelData(channel);
-
-    // Loop through the 4096 samples
-    for (var sample = 0; sample < inputBuffer.length; sample++) {
-      // make output equal to the same as the input
-      outputData[sample] = inputData[sample];
-
-      // add noise to each output sample
-      outputData[sample] += ((Math.random() * 2) - 1) * 0.2;
-    }
-  }
-}
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-getData();
-
-// wire up play button
-playButton.onclick = function() {
-  source.connect(scriptNode);
-  scriptNode.connect(audioCtx.destination);
-  source.start();
-}
-
-// When the buffer source stops playing, disconnect everything
-source.onended = function() {
-  source.disconnect(scriptNode);
-  scriptNode.disconnect(audioCtx.destination);
-}
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规范

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SpecificationStatusComment
{{SpecName('Web Audio API', '#widl-AudioContext-createScriptProcessor-ScriptProcessorNode-unsigned-long-bufferSize-unsigned-long-numberOfInputChannels-unsigned-long-numberOfOutputChannels', 'createScriptProcessor')}}{{Spec2('Web Audio API')}}
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浏览器兼容性

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{{CompatibilityTable}}
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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")}}
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FeatureAndroidEdgeFirefox Mobile (Gecko)Firefox OSIE MobileOpera MobileSafari MobileChrome for Android
Basic support{{CompatUnknown}}{{CompatVersionUnknown}}26.01.2{{CompatUnknown}}{{CompatUnknown}}{{CompatUnknown}}33.0
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See also

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