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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

copyFromChannel() 方法在 AudioBuffer interface copies the audio sample data from the specified channel of the AudioBuffer to a specified Float32Array .

句法

myArrayBuffer.copyFromChannel(destination, channelNumber, startInChannel);
					

参数

destination

Float32Array to copy the channel's samples to.

channelNumber

The channel number of the current AudioBuffer to copy the channel data from.

startInChannel 可选

An optional offset into the source channel's buffer from which to begin copying samples. If not specified, a value of 0 (the beginning of the buffer) is assumed by default.

返回值

undefined .

异常

indexSizeError

One of the input parameters has a value that is outside the accepted range:

• 值 channelNumber specifies a channel number which doesn't exist (that is, it's greater than or equal to the value of numberOfChannels on the channel).
• 值 startInChannel is outside the current range of samples that already exist in the source buffer; that is, it's greater than its current length .

范例

This example creates a new audio buffer, then copies the samples from another channel into it.

var myArrayBuffer = audioCtx.createBuffer(2, frameCount, audioCtx.sampleRate);
var anotherArray = new Float32Array(length);
myArrayBuffer.copyFromChannel(anotherArray, 1, 0);
					

规范

规范	状态	注释
Web 音频 API The definition of 'copyFromChannel' in that specification.	工作草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
copyFromChannel	Chrome 14	Edge 13	Firefox 25	IE 不支持 No	Opera 15	Safari 6	WebView Android Yes	Chrome Android 18	Firefox Android 26	Opera Android 14	Safari iOS ?	Samsung Internet Android 1.0

图例

完整支持

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

另请参阅

• 使用 Web 音频 API

元数据

• 最后修改： 2020 年 1 月 22 日

相关话题

1. Web 音频 API
2. AudioBuffer
3. 构造函数

   1. AudioBuffer()
4. 特性

   1. duration
   2. length
   3. numberOfChannels
   4. sampleRate
5. 方法

   1. copyFromChannel()
   2. copyToChannel()
   3. getChannelData()
6. Related pages for Web Audio API

   1. AnalyserNode
   2. AudioBufferSourceNode
   3. AudioContext
   4. AudioContextOptions
   5. AudioDestinationNode
   6. AudioListener
   7. AudioNode
   8. AudioNodeOptions
   9. AudioParam
   10. AudioProcessingEvent
   11. AudioScheduledSourceNode
   12. AudioWorklet
   13. AudioWorkletGlobalScope
   14. AudioWorkletNode
   15. AudioWorkletProcessor
   16. BaseAudioContext
   17. BiquadFilterNode
   18. ChannelMergerNode
   19. ChannelSplitterNode
   20. ConstantSourceNode
   21. ConvolverNode
   22. DelayNode
   23. DynamicsCompressorNode
   24. GainNode
   25. IIRFilterNode
   26. MediaElementAudioSourceNode
   27. MediaStreamAudioDestinationNode
   28. MediaStreamAudioSourceNode
   29. OfflineAudioCompletionEvent
   30. OfflineAudioContext
   31. OscillatorNode
   32. PannerNode
   33. PeriodicWave
   34. StereoPannerNode
   35. WaveShaperNode