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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport"
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content="width=device-width">
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<title>Cámara</title>
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<style>
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html {
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color-scheme: light dark;
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}
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</style>
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</head>
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<body>
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<h1>Cámara</h1>
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<p>
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Para grabar o capturar imagen,
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cliquea
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<strong>Inicia</strong>.
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</p>
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<p>
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Para grabar por 5 segundos
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cliquea
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<strong>Graba</strong>
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y cliquea
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<strong>Para</strong> para
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detener.
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</p>
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<p>
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Para capturar una imagen de la
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cámara, cliquea
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<strong>Captura</strong>.
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</p>
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<menu style="display: flex;
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flex-wrap: wrap;
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list-style: none;">
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<li>
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<button type="button"
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onclick="inicia()">
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Inicia
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</button>
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</li>
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<li>
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<button type="button"
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onclick="graba()">
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Graba
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</button>
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</li>
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<li>
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<button type="button"
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onclick="para();">
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Para
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</button>
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</li>
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<li>
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<button type="button"
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onclick="captura()">
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Captura
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</button>
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</li>
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</menu>
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<section
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style="display: inline-block;
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vertical-align: top;">
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<h1>Preview</h1>
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<video id="preview" width="160"
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height="120" autoplay
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muted></video>
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</section>
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<section
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style="display: inline-block;
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vertical-align: top;">
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<h1>Recording</h1>
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<video id="recording" width="160"
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height="120" controls></video>
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<p>
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<a id="descarga">Descarga</a>
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</p>
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<div id="mensajes"></div>
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</section>
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<section
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style="display: inline-block;
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vertical-align: top;">
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<h1>Imagen</h1>
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<canvas id="canvas" width="160"
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height="120"></canvas>
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<p>
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<a id="descargaImagen">
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Descarga</a>
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</p>
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</section>
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<script>
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let stream = null
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let TIEMPO_DE_GRABACION = 5000
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var context =
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canvas.getContext('2d')
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async function inicia() {
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try {
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stream = await navigator
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.mediaDevices.getUserMedia({
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video: true,
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audio: true
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})
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preview.srcObject = stream
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descarga.href = stream
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preview.captureStream =
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preview.captureStream
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|| preview.mozCaptureStream
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await new Promise(
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resolve =>
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preview.onplaying = resolve)
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} catch (e) {
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log(e.message)
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}
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}
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async function graba() {
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try {
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const recordedChunks =
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await grabaClip(stream,
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TIEMPO_DE_GRABACION)
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let recordedBlob = new Blob(
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recordedChunks,
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{ type: "video/webm" })
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recording.src =
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URL.createObjectURL(
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recordedBlob)
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descarga.href = recording.src
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descarga.download =
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"RecordedVideo.webm"
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log("Exitosamente grabados "
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+ recordedBlob.size
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+ " bytes de "
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+ recordedBlob.type
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+ " media.")
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} catch (e) {
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log(e.message)
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}
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}
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function para() {
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detiene(preview.srcObject)
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}
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function captura() {
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context.drawImage(preview,
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0, 0, 160, 120)
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descargaImagen.href =
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canvas.toDataURL('image/jpeg')
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descargaImagen.download =
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"imagen.jpg"
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}
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function grabaClip(stream,
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milisegundos) {
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let recorder =
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new MediaRecorder(stream)
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let data = []
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recorder.ondataavailable =
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event => data.push(event.data)
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recorder.start()
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log(recorder.state
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+ " durante "
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+ (milisegundos / 1000)
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+ " segundos…")
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let detenido = new Promise(
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(resolve, reject) => {
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recorder.onstop = resolve
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recorder.onerror =
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event => reject(event.name)
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})
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let grabado =
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espera(milisegundos)
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.then(() => recorder.state
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=== "recording"
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&& recorder.stop()
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)
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return Promise.all([
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detenido,
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grabado
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])
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.then(() => data)
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}
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function detiene(stream) {
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stream.getTracks().forEach(
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track => track.stop())
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}
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function log(msg) {
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mensajes.innerHTML +=
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msg + "<br>"
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}
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function espera(milisegundos) {
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return new Promise(
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resolve => setTimeout(
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resolve, milisegundos))
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}
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</script>
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</body>
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</html>
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