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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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commit 90d46a06938d1538534ad48d69248bf923c1c322
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,225 @@ | ||
| /* | ||
| * | ||
| * 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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