dashjs
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A reference client implementation for the playback of MPEG DASH via Javascript and compliant browsers.
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<h1 class="page-title">Source: offline/storage/IndexDBStore.js</h1>
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<pre
class="sunlight-highlight-javascript linenums">/**
* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2013, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @ignore
*/
const localforage = require('localforage');
const entities = require('html-entities').XmlEntities;
function IndexDBStore() {
let instance,
manifestStore,
fragmentStores;
function setup() {
fragmentStores = {};
if (typeof window === 'undefined') {
return;
}
localforage.config({
driver: localforage.INDEXEDDB,
name: 'dash_offline_db'
});
manifestStore = localforage.createInstance({
driver: localforage.INDEXEDDB,
name: 'dash_offline_db',
version: 1.0,
storeName: 'manifest'
});
}
/////////////////////////////////////////
//
// GET/SET Methods
//
////////////////////////////////////////
/**
* Creates an instance of localforage to store fragments in indexed db
* @param {string} storeName
* @instance
*/
function createFragmentStore(storeName) {
if (!fragmentStores[storeName]) {
console.log('setStore ' + storeName);
let fragmentStore = localforage.createInstance({
driver: localforage.INDEXEDDB,
name: 'dash_offline_db',
version: 1.0,
storeName: storeName
});
fragmentStores[storeName] = fragmentStore;
}
}
/**
* Update download status
* @param {number} manifestId
* @param {string} newStatus
* @returns {Promise} promise
* @instance
*/
function setDownloadingStatus(manifestId, newStatus) {
return getManifestById(manifestId).then(function (item) {
item.status = newStatus;
return updateManifest(item).catch(function () {
return Promise.reject('Cannot set status ' + newStatus + ' for this stream !');
});
}).catch(function (err) {
return Promise.reject(err);
});
}
/**
* Updat last downloaded fragment index for representationId
* @param {number} manifestId - manifest id
* @param {string} representationId - representation
* @param {number} state - representation state
* @returns {Promise} promise
* @instance
*/
function setRepresentationCurrentState(manifestId, representationId, state) {
return getManifestById(manifestId).then(function (item) {
if (!item.state) {
item.state = {};
}
if (!item.state[representationId]) {
item.state[representationId] = {
index: -1,
downloaded: 0
};
}
item.state[representationId] = state;
return updateManifest(item).catch(function () {
return Promise.reject('Cannot set current index for represenation id ' + representationId);
});
}).catch(function (err) {
return Promise.reject(err);
});
}
/**
* Returns current downloaded segment index for representation
* @param {number} manifestId - manifest id
* @param {string} representationId - representation
* @returns {Promise} promise
* @instance
*/
function getRepresentationCurrentState(manifestId, representationId) {
return getManifestById(manifestId).then(function (item) {
let state = {
index: -1,
downloaded: 0
};
if (item.state && item.state[representationId]) {
state = item.state[representationId];
}
return Promise.resolve(state);
}).catch(function (err) {
return Promise.reject(err);
});
}
/**
* Returns a fragment from its key
* @param {number} manifestId
* @param {number} key
* @returns {Promise} fragment
* @instance
*/
function getFragmentByKey(manifestId, key) {
let fragmentStore = fragmentStores[manifestId];
if (!fragmentStore) {
return Promise.reject(new Error (`No fragment store found for manifest ${manifestId}`));
}
return fragmentStore.getItem(key).then(function (value) {
return Promise.resolve(value);
}).catch(function (err) {
return Promise.reject(err);
});
}
/**
* Returns a manifest from its identifier
* @param {number} id
* @returns {Promise} {Object[]} manifests
* @instance
*/
function getManifestById(id) {
return getAllManifests().then(function (array) {
if (array) {
let item = null;
for (let i = 0; i < array.manifests.length; i++) {
if (array.manifests[i].manifestId === parseInt(id)) {
item = array.manifests[i];
}
}
if (item !== null) {
item.manifest = entities.decode(item.manifest);
return Promise.resolve(item);
} else {
return Promise.reject('Cannot found manifest with this manifestId : ' + id);
}
} else {
return Promise.reject('Any manifests stored in DB !');
}
}).catch(function (err) {
return Promise.reject(err);
});
}
/**
* Returns all offline manifests
* @returns {Promise} {Object[]} manifests
* @instance
*/
function getAllManifests() {
return manifestStore.getItem('manifest').then(function (array) {
return Promise.resolve(array ? array : {
'manifests': []
});
}).catch(function (err) {
return Promise.reject(err);
});
}
/**
* Return higher manifest id
* @returns {Promise} number
* @instance
*/
function getCurrentHigherManifestId() {
return getAllManifests().then(function (array) {
let higherManifestId = 0;
if (array) {
for (let i = 0; i < array.manifests.length; i++) {
if (array.manifests[i].manifestId > higherManifestId) {
higherManifestId = array.manifests[i].manifestId;
}
}
return Promise.resolve(higherManifestId);
} else {
return Promise.resolve(higherManifestId);
}
}).catch(function (err) {
return Promise.reject(err);
});
}
/**
* Update manifest
* @param {Object} manifest updated manifest
* @returns {Promise} promise asynchronously resolved
* @instance
*/
function updateManifest(manifest) {
return getAllManifests().then(function (array) {
try {
for (let i = 0; i < array.manifests.length; i++) {
if (array.manifests[i].manifestId === manifest.manifestId) {
array.manifests[i] = manifest;
}
}
return manifestStore.setItem('manifest', array);
} catch (err) {
throw new Error('Any results found !');
}
});
}
/**
* save selected representation by user
* @param {Object} manifest updated manifest
* @param {Object} selected selected representations
* @returns {Promise} promise asynchronously resolved
* @instance
*/
function saveSelectedRepresentations(manifest, selected) {
return getManifestById(manifest).then(function (item) {
if (!item.selected) {
item.selected = {};
}
item.selected = selected;
return updateManifest(item).catch(function () {
return Promise.reject('Cannot save selected representations');
});
}).catch(function (err) {
return Promise.reject(err);
});
}
/**
* Store a manifest in manifest array
* @param {Object} manifest
* @instance
*/
function storeManifest(manifest) {
return manifestStore.getItem('manifest').then(function (results) {
let array = results ? results : {
'manifests': []
};
array.manifests.push(manifest);
return manifestStore.setItem('manifest', array);
});
}
/**
* Store a fragment in fragment store
* @param {number} manifestId
* @param {number} fragmentId
* @param {Object} fragmentData
* @returns {Promise} promise asynchronously resolved
* @instance
*/
function storeFragment(manifestId, fragmentId, fragmentData) {
let fragmentStore = fragmentStores[manifestId];
if (!fragmentStore) {
return Promise.reject(new Error (`No fragment store found for manifest ${manifestId}`));
}
return fragmentStore.setItem(fragmentId, fragmentData, function () {
return Promise.resolve();
}).catch(function (err) {
return Promise.reject(err);
});
}
/////////////////////////////////////////
//
// DROP Methods
//
////////////////////////////////////////
/**
* Remove all manifest and fragment store
* @returns {Promise} promise asynchronously resolved
* @instance
*/
function dropAll() {
return localforage.clear().then(function () {
return Promise.resolve();
}).catch(function (err) {
return Promise.reject(err);
});
}
/**
* Remove framgent store given its name
* @param {string} storeName
* @instance
*/
function dropFragmentStore(storeName) {
localforage.dropInstance({
driver: localforage.INDEXEDDB,
name: 'dash_offline_db',
version: 1.0,
storeName: storeName
}).then(function () {
delete fragmentStores[storeName];
}).catch(function (err) {
console.log('dropFragmentStore failed ' + err);
});
return;
}
/**
* Remove download given its id (fragmentStore + manifest entry in manifest array)
* @param {number} manifestId
* @returns {Promise} promise asynchronously resolved
* @instance
*/
function deleteDownloadById(manifestId) {
return manifestStore.getItem('manifest').then(function (array) {
if (array) {
return deleteFragmentStore(manifestId).then(function () {
for (let i = 0; i < array.manifests.length; i++) {
if (array.manifests[i].manifestId === parseInt(manifestId)) {
array.manifests.splice(i, 1);
}
}
return manifestStore.setItem('manifest', array).then(function () {
return Promise.resolve('This stream has been successfull removed !');
}).catch(function () {
return Promise.reject('An error occured when trying to delete this manifest');
});
});
} else {
return Promise.resolve('Nothing to delete !');
}
}).catch(function (err) {
return Promise.reject(err);
});
}
/**
* Remove fragment store
* @param {string} storeName
* @returns {Promise} promise asynchronously resolved
* @instance
*/
function deleteFragmentStore(storeName) {
localforage.createInstance({
name: 'dash_offline_db',
storeName: storeName
});
return localforage.dropInstance({
name: 'dash_offline_db',
storeName: storeName
}).then(function () {
delete fragmentStores[storeName];
return Promise.resolve();
}).catch(function (err) {
console.log(err);
return Promise.reject(err);
});
}
setup();
instance = {
dropAll: dropAll,
getFragmentByKey: getFragmentByKey,
getManifestById: getManifestById,
storeFragment: storeFragment,
storeManifest: storeManifest,
updateManifest: updateManifest,
saveSelectedRepresentations: saveSelectedRepresentations,
createFragmentStore: createFragmentStore,
setDownloadingStatus: setDownloadingStatus,
setRepresentationCurrentState: setRepresentationCurrentState,
getRepresentationCurrentState: getRepresentationCurrentState,
getCurrentHigherManifestId: getCurrentHigherManifestId,
getAllManifests: getAllManifests,
dropFragmentStore: dropFragmentStore,
deleteDownloadById: deleteDownloadById
};
return instance;
}
IndexDBStore.__dashjs_factory_name = 'IndexDBStore';
export default dashjs.FactoryMaker.getSingletonFactory(IndexDBStore); /* jshint ignore:line */
</pre>
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<script src="scripts/toc.js"></script>
<script type="text/javascript" src="scripts/fulltext-search-ui.js"></script>
<script>
$( function () {
$( "[id*='$']" ).each( function () {
var $this = $( this );
$this.attr( "id", $this.attr( "id" ).replace( "$", "__" ) );
} );
$( ".tutorial-section pre, .readme-section pre, pre.prettyprint.source" ).each( function () {
var $this = $( this );
var example = $this.find( "code" );
exampleText = example.html();
var lang = /{@lang (.*?)}/.exec( exampleText );
if ( lang && lang[1] ) {
exampleText = exampleText.replace( lang[0], "" );
example.html( exampleText );
lang = lang[1];
} else {
var langClassMatch = example.parent()[0].className.match(/lang\-(\S+)/);
lang = langClassMatch ? langClassMatch[1] : "javascript";
}
if ( lang ) {
$this
.addClass( "sunlight-highlight-" + lang )
.addClass( "linenums" )
.html( example.html() );
}
} );
Sunlight.highlightAll( {
lineNumbers : true,
showMenu : true,
enableDoclinks : true
} );
$.catchAnchorLinks( {
navbarOffset: 10
} );
$( "#toc" ).toc( {
anchorName : function ( i, heading, prefix ) {
return $( heading ).attr( "id" ) || ( prefix + i );
},
selectors : "#toc-content h1,#toc-content h2,#toc-content h3,#toc-content h4",
showAndHide : false,
smoothScrolling: true
} );
$( "#main span[id^='toc']" ).addClass( "toc-shim" );
$( '.dropdown-toggle' ).dropdown();
$( "table" ).each( function () {
var $this = $( this );
$this.addClass('table');
} );
} );
</script>
<!--Navigation and Symbol Display-->
<script>
$( function () {
$( '#main' ).localScroll( {
offset : { top : 60 } //offset by the height of your header (give or take a few px, see what works for you)
} );
$( "dt.name" ).each( function () {
var $this = $( this ).find("h4");
var icon = $( "<i/>" ).addClass( "icon-plus-sign" ).addClass( "pull-right" ).addClass( "icon-white" );
var dt = $(this);
var children = dt.next( "dd" );
dt.prepend( icon ).css( {cursor : "pointer"} );
dt.addClass( "member-collapsed" ).addClass( "member" );
children.hide();
dt.children().on( "click", function () {
children = dt.next( "dd" );
children.slideToggle( "fast", function () {
if ( children.is( ":visible" ) ) {
icon.addClass( "icon-minus-sign" ).removeClass( "icon-plus-sign" ).removeClass( "icon-white" );
dt.addClass( "member-open" ).animate( "member-collapsed" );
} else {
icon.addClass( "icon-plus-sign" ).removeClass( "icon-minus-sign" ).addClass( "icon-white" );
dt.addClass( "member-collapsed" ).removeClass( "member-open" );
}
} );
} );
} );
} );
</script>
<!--Google Analytics-->
<script type="text/javascript">
$(document).ready(function() {
SearcherDisplay.init();
});
</script>
</body>
</html>