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This UPM module captures a still frame from a Linux V4L device, such as a USB webcam, and and then allows you to save it as a JPEG image into a file. The camera and driver in use must support streaming, mmap-able buffers and must provide data in YUYV format. This should encompass most video cameras out there. It has been tested with a few off the shelf USB cameras without any problems. Signed-off-by: Jon Trulson <jtrulson@ics.com> Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
70 lines
2.2 KiB
JavaScript
70 lines
2.2 KiB
JavaScript
/*jslint node:true, vars:true, bitwise:true, unparam:true */
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/*jshint unused:true */
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/*
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* Author: Jon Trulson <jtrulson@ics.com>
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* Copyright (c) 2016 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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var sensorObj = require('jsupm_vcap');
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/************** Main code **************/
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var defaultDev = "/dev/video0";
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// if an argument was specified, use it as the device instead
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if (process.argv.length > 2)
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{
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defaultDev = process.argv[2];
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}
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console.log("Using device " + defaultDev);
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console.log("Initializing...");
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// Instantiate an VCAP instance, using the specified video device
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var sensor = new sensorObj.VCAP(defaultDev);
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// enable some debug/verbose output
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sensor.setDebug(true);
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// This is just a hint. The kernel can change this to a lower
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// resolution that the hardware supports. Use getWidth() and
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// getHeight() methods to see what the kernel actually chose if you
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// care.
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sensor.setResolution(1920, 1080);
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// capture an image
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sensor.captureImage();
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// convert and save it as a jpeg
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sensor.saveImage("video-img1.jpg");
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// make sure we clean up
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sensor = null;
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sensorObj.cleanUp();
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sensorObj = null;
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console.log("Exiting...");
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process.exit(0);
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