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CB-7963 Adds support for browser platform
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Vladimir Kotikov
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Mar 16, 2015
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/* | ||
* | ||
* Licensed to the Apache Software Foundation (ASF) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. The ASF licenses this file | ||
* to you under the Apache License, Version 2.0 (the | ||
* "License"); you may not use this file except in compliance | ||
* with the License. You may obtain a copy of the License at | ||
* | ||
* http://www.apache.org/licenses/LICENSE-2.0 | ||
* | ||
* Unless required by applicable law or agreed to in writing, | ||
* software distributed under the License is distributed on an | ||
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
* KIND, either express or implied. See the License for the | ||
* specific language governing permissions and limitations | ||
* under the License. | ||
* | ||
*/ | ||
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/*global require, module*/ | ||
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var MediaFile = require('org.apache.cordova.media-capture.MediaFile'); | ||
var MediaFileData = require('org.apache.cordova.media-capture.MediaFileData'); | ||
var CaptureError = require('org.apache.cordova.media-capture.CaptureError'); | ||
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/** | ||
* Helper function that converts data URI to Blob | ||
* @param {String} dataURI Data URI to convert | ||
* @return {Blob} Blob, covnerted from DataURI String | ||
*/ | ||
function dataURItoBlob(dataURI) { | ||
// convert base64 to raw binary data held in a string | ||
// doesn't handle URLEncoded DataURIs | ||
var byteString = atob(dataURI.split(',')[1]); | ||
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// separate out the mime component | ||
var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0]; | ||
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// write the bytes of the string to an ArrayBuffer | ||
var ab = new ArrayBuffer(byteString.length); | ||
var ia = new Uint8Array(ab); | ||
for (var i = 0; i < byteString.length; i++) { | ||
ia[i] = byteString.charCodeAt(i); | ||
} | ||
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// write the ArrayBuffer to a blob, and you're done | ||
return new Blob([ab], { type: mimeString }); | ||
} | ||
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/** | ||
* Creates basic camera UI with preview 'video' element and 'Cancel' button | ||
* Capture starts, when you clicking on preview. | ||
*/ | ||
function CameraUI() { | ||
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// Root element for preview | ||
var container = document.createElement('div'); | ||
container.style.cssText = "left: 0px; top: 0px; width: 100%; height: 100%; position: fixed; z-index:9999;" + | ||
"padding: 40px; background-color: rgba(0,0,0,0.75);" + | ||
"text-align:center; visibility: hidden"; | ||
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// Set up root element contetnts | ||
container.innerHTML = | ||
'<div id="captureHint" style="height:100%; position:relative; display:inline-flex; align-content:flex-start;">' + | ||
'<h2 style="position: absolute; width: 100%; background-color: rgba(255,255,255,0.25); margin: 0">' + | ||
'Click on preview to capture image. Click outside of preview to cancel.</h1>' + | ||
'<video id="capturePreview" style="height: 100%"></video>' + | ||
'</div>'; | ||
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// Add container element to DOM but do not display it since visibility == hidden | ||
document.body.appendChild(container); | ||
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// Create fullscreen preview | ||
var preview = document.getElementById('capturePreview'); | ||
preview.autoplay = true; | ||
// We'll show preview only when video element content | ||
// is fully loaded to avoid glitches | ||
preview.onplay = function () { | ||
container.style.visibility = 'visible'; | ||
}; | ||
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this.container = container; | ||
this.preview = preview; | ||
} | ||
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/** | ||
* Displays capture preview | ||
* @param {Number} count Number of images to take | ||
* @param {Function} successCB Success callback, that accepts data URL of captured image | ||
* @param {Function} errorCB Error callback | ||
*/ | ||
CameraUI.prototype.startPreview = function(count, successCB, errorCB) { | ||
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this.preview.onclick = function (e) { | ||
// proceed with capture here | ||
// We don't need to propagate click event to parent elements. | ||
// Otherwise click on vieo element will trigger click event handler | ||
// for preview root element and cause preview cancellation | ||
e.stopPropagation(); | ||
// Create canvas element, put video frame on it | ||
// and save its contant as Data URL | ||
var canvas = document.createElement('canvas'); | ||
canvas.width = this.videoWidth; | ||
canvas.height = this.videoHeight; | ||
canvas.getContext('2d').drawImage(that.preview, 0, 0); | ||
successCB(canvas.toDataURL('image/jpeg')); | ||
}; | ||
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this.container.onclick = function () { | ||
// Cancel capture here | ||
errorCB(new CaptureError(CaptureError.CAPTURE_NO_MEDIA_FILES)); | ||
}; | ||
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var that = this; | ||
navigator.getUserMedia({video: true}, function (previewStream) { | ||
// Save video stream to be able to stop it later | ||
that._previewStream = previewStream; | ||
that.preview.src = URL.createObjectURL(previewStream); | ||
// We don't need to set visibility = true for preview element | ||
// since this will be done automatically in onplay event handler | ||
}, function (/*err*/) { | ||
errorCB(new CaptureError(CaptureError.CAPTURE_INTERNAL_ERR)); | ||
}); | ||
}; | ||
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/** | ||
* Destroys camera preview, removes all elements created | ||
*/ | ||
CameraUI.prototype.destroyPreview = function () { | ||
this.preview.pause(); | ||
this.preview.src = null; | ||
this._previewStream.stop(); | ||
this._previewStream = null; | ||
this.container && document.body.removeChild(this.container); | ||
}; | ||
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module.exports = { | ||
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captureAudio:function(successCallback, errorCallback) { | ||
errorCallback && errorCallback(new CaptureError(CaptureError.CAPTURE_NOT_SUPPORTED)); | ||
}, | ||
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captureVideo:function (successCallback, errorCallback) { | ||
errorCallback && errorCallback(new CaptureError(CaptureError.CAPTURE_NOT_SUPPORTED)); | ||
}, | ||
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captureImage:function (successCallback, errorCallback, args) { | ||
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var fail = function (code) { | ||
errorCallback && errorCallback(new CaptureError(code || CaptureError.CAPTURE_INTERNAL_ERR)); | ||
}; | ||
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var options = args[0]; | ||
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var limit = options.limit || 1; | ||
if (typeof limit !== 'number' || limit < 1) { | ||
fail(CaptureError.CAPTURE_INVALID_ARGUMENT); | ||
return; | ||
} | ||
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// Counter for already taken images | ||
var imagesTaken = 0; | ||
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navigator.getUserMedia = navigator.getUserMedia || | ||
navigator.webkitGetUserMedia || | ||
navigator.mozGetUserMedia || | ||
navigator.msGetUserMedia; | ||
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if (!navigator.getUserMedia) { | ||
fail(CaptureError.CAPTURE_NOT_SUPPORTED); | ||
return; | ||
} | ||
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var ui = new CameraUI(); | ||
ui.startPreview(limit, function (data) { | ||
// Check if we're done with capture. If so, then destroy UI | ||
if (++imagesTaken >= limit) { | ||
ui.destroyPreview(); | ||
} | ||
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// Array of resultant MediaFiles | ||
var mediaFiles = []; | ||
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// save data to file here | ||
window.requestFileSystem(window.TEMPORARY, data.length * limit, function (fileSystem) { | ||
// If we need to capture multiple files, then append counter to filename | ||
var fileName = limit <= 1 ? 'image.jpg' : 'image' + imagesTaken + '.jpg'; | ||
fileSystem.root.getFile(fileName, {create: true}, function (file) { | ||
file.createWriter(function (writer) { | ||
writer.onwriteend = function () { | ||
file.getMetadata(function (meta) { | ||
mediaFiles.push(new MediaFile(file.name, file.toURL(), 'image/jpeg', meta.modificationTime, meta.size)); | ||
// Check if we're done with capture. If so, then call a successCallback | ||
if (imagesTaken >= limit) { | ||
successCallback(mediaFiles); | ||
} | ||
}, fail); | ||
}; | ||
writer.onerror = fail; | ||
// Since success callback for start preview returns | ||
// a base64 encoded string, we need to convert it to blob first | ||
writer.write(dataURItoBlob(data)); | ||
}); | ||
}, fail); | ||
}, fail); | ||
}, function (err) { | ||
ui.destroyPreview(); | ||
fail(err.code); | ||
}); | ||
}, | ||
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getFormatData: function (successCallback, errorCallback, args) { | ||
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var img = document.createElement('img'); | ||
img.src = args[0]; | ||
img.onload = function () { | ||
successCallback && successCallback(new MediaFileData(null, 0, img.height, img.width, 0)); | ||
}; | ||
} | ||
}; | ||
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require("cordova/exec/proxy").add("Capture",module.exports); |
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