From 1109132f09d75da9a28b649c7677bb6ce07c40c0 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:41:45 -0500 Subject: initial commit --- files/es/web/api/analysernode/index.html | 218 +++++++++++++++++++++++++++++++ 1 file changed, 218 insertions(+) create mode 100644 files/es/web/api/analysernode/index.html (limited to 'files/es/web/api/analysernode/index.html') diff --git a/files/es/web/api/analysernode/index.html b/files/es/web/api/analysernode/index.html new file mode 100644 index 0000000000..73a51adba8 --- /dev/null +++ b/files/es/web/api/analysernode/index.html @@ -0,0 +1,218 @@ +--- +title: AnalyserNode +slug: Web/API/AnalyserNode +translation_of: Web/API/AnalyserNode +--- +

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

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La interfaz AnalyserNode representa un nodo habilitado para proveer frecuencia en tiempo real y analisis de tiempo-dominio. Es un {{domxref("AudioNode")}} que pasa el flujo de audio sin modificación desde el origen de entrada a la salida, pero, te permite obtener los datos generados, procesarlos, y crear visualizaciones de audio.

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Un AnalyzerNode tiene exactamente una entrada y una salida. El nodo trabaja incluso si la salida no se encuentra conectada.

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Without modifying the audio stream, the node allows to get the frequency and time-domain data associated to it, using a FFT.

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Numero de entradas1
Numero de salidas1 (puede estar desconectada)
Modo de conteo de canal"explicit"
Conteo de cana1
Interpretación de canal"speakers"
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Herencia

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Esta interfaz hereda de las siguientes interfaces padre:

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{{InheritanceDiagram}}

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Propiedades

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Inherits properties from its parent, {{domxref("AudioNode")}}.

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{{domxref("AnalyserNode.fftSize")}}
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Is an unsigned long value representing the size of the FFT (Fast Fourier Transform) to be used to determine the frequency domain.
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{{domxref("AnalyserNode.frequencyBinCount")}} {{readonlyInline}}
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Is an unsigned long value half that of the FFT size. This generally equates to the number of data values you will have to play with for the visualization.
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{{domxref("AnalyserNode.minDecibels")}}
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Is a double value representing the minimum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte values — basically, this specifies the minimum value for the range of results when using getByteFrequencyData().
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{{domxref("AnalyserNode.maxDecibels")}}
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Is a double value representing the maximum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte values — basically, this specifies the maximum value for the range of results when using getByteFrequencyData().
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{{domxref("AnalyserNode.smoothingTimeConstant")}}
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Is a double value representing the averaging constant with the last analysis frame — basically, it makes the transition between values over time smoother.
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Methods

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Inherits methods from its parent, {{domxref("AudioNode")}}.

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{{domxref("AnalyserNode.getFloatFrequencyData()")}}
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Copies the current frequency data into a {{domxref("Float32Array")}} array passed into it.
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{{domxref("AnalyserNode.getByteFrequencyData()")}}
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Copies the current frequency data into a {{domxref("Uint8Array")}} (unsigned byte array) passed into it.
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{{domxref("AnalyserNode.getFloatTimeDomainData()")}}
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Copies the current waveform, or time-domain, data into a {{domxref("Float32Array")}} array passed into it.
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{{domxref("AnalyserNode.getByteTimeDomainData()")}}
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Copies the current waveform, or time-domain, data into a {{domxref("Uint8Array")}} (unsigned byte array) passed into it.
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Examples

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Note: See the guide Visualizations with Web Audio API for more information on creating audio visualizations.

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Basic usage

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The following example shows basic usage of an {{domxref("AudioContext")}} to create an AnalyserNode, then {{domxref("window.requestAnimationFrame()","requestAnimationFrame")}} and {{htmlelement("canvas")}} to collect time domain data repeatedly and draw an "oscilloscope style" output of the current audio input. For more complete applied examples/information, check out our Voice-change-O-matic demo (see app.js lines 128–205 for relevant code).

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var audioCtx = new (window.AudioContext || window.webkitAudioContext)();
+var analyser = audioCtx.createAnalyser();
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+  ...
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+analyser.fftSize = 2048;
+var bufferLength = analyser.frequencyBinCount;
+var dataArray = new Uint8Array(bufferLength);
+analyser.getByteTimeDomainData(dataArray);
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+// draw an oscilloscope of the current audio source
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+function draw() {
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+      drawVisual = requestAnimationFrame(draw);
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+      analyser.getByteTimeDomainData(dataArray);
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+      canvasCtx.fillStyle = 'rgb(200, 200, 200)';
+      canvasCtx.fillRect(0, 0, WIDTH, HEIGHT);
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+      canvasCtx.lineWidth = 2;
+      canvasCtx.strokeStyle = 'rgb(0, 0, 0)';
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+      canvasCtx.beginPath();
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+      var sliceWidth = WIDTH * 1.0 / bufferLength;
+      var x = 0;
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+      for(var i = 0; i < bufferLength; i++) {
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+        var v = dataArray[i] / 128.0;
+        var y = v * HEIGHT/2;
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+        if(i === 0) {
+          canvasCtx.moveTo(x, y);
+        } else {
+          canvasCtx.lineTo(x, y);
+        }
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+        x += sliceWidth;
+      }
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+      canvasCtx.lineTo(canvas.width, canvas.height/2);
+      canvasCtx.stroke();
+    };
+
+    draw();
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Specifications

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SpecificationStatusComment
{{SpecName('Web Audio API', '#the-analysernode-interface', 'AnalyserNode')}}{{Spec2('Web Audio API')}} 
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Browser compatibility

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

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