import {startsWith, getFileExtension} from '../utils/string';
import {getUrlFromUri} from '../utils/uri';
import {getViewFromDOMVideo} from '../image/domReader';
import {fileContentTypes} from './filesLoader';
import {urlContentTypes} from './urlsLoader';
/**
* Raw video loader.
*
* Url example (cors enabled):
* {@link https://raw.githubusercontent.com/clappr/clappr/master/test/fixtures/SampleVideo_360x240_1mb.mp4}.
*/
export class RawVideoLoader {
/**
* Set the loader options.
*
* @param {object} _opt The input options.
*/
setOptions(_opt) {
// does nothing
}
/**
* Is the load ongoing? TODO...
*
* @returns {boolean} True if loading.
*/
isLoading() {
return true;
}
/**
* Create a Data URI from an HTTP request response.
*
* @param {object} response The HTTP request response.
* @param {string} dataType The data type.
* @returns {string} The data URI.
*/
#createDataUri(response, dataType) {
// image data as string
const bytes = new Uint8Array(response);
let videoDataStr = '';
for (let i = 0; i < bytes.byteLength; ++i) {
videoDataStr += String.fromCharCode(bytes[i]);
}
// create uri
const uri = 'data:video/' + dataType +
';base64,' + window.btoa(videoDataStr);
return uri;
}
/**
* Internal Data URI load.
*
* @param {object} buffer The read data.
* @param {string} origin The data origin.
* @param {number} index The data index.
*/
load(buffer, origin, index) {
// create a DOM video
const video = document.createElement('video');
if (typeof origin === 'string') {
// url case
const ext = origin.split('.').pop().toLowerCase();
video.src = this.#createDataUri(buffer, ext);
} else {
video.src = buffer;
}
// onload handler
video.onloadedmetadata = (event) => {
try {
getViewFromDOMVideo(event.target,
this.onloaditem, this.onload,
this.onprogress, this.onloadend,
origin, index);
} catch (error) {
this.onerror({
error: error,
source: origin
});
this.onloadend({
source: origin
});
}
};
}
/**
* Abort load.
*/
abort() {
this.onabort({});
this.onloadend({});
}
/**
* Check if the loader can load the provided file.
* True for files with type 'video.*'.
*
* @param {File} file The file to check.
* @returns {boolean} True if the file can be loaded.
*/
canLoadFile(file) {
return (typeof file.type !== 'undefined' &&
file.type.match('video.*') !== null);
}
/**
* Check if the loader can load the provided url.
* True if one of the folowing conditions is true:
* - the `options.forceLoader` is 'rawvideo',
* - the `options.requestHeaders` contains an item
* starting with 'Accept: video/'.
* - the url has a 'mp4', 'ogg' or 'webm' extension.
*
* @param {string} url The url to check.
* @param {object} [options] Optional url request options.
* @returns {boolean} True if the url can be loaded.
*/
canLoadUrl(url, options) {
// check options
if (typeof options !== 'undefined') {
// check options.forceLoader
if (typeof options.forceLoader !== 'undefined' &&
options.forceLoader === 'rawvideo') {
return true;
}
// check options.requestHeaders for 'Accept'
if (typeof options.requestHeaders !== 'undefined') {
const isNameAccept = function (element) {
return element.name === 'Accept';
};
const acceptHeader = options.requestHeaders.find(isNameAccept);
if (typeof acceptHeader !== 'undefined') {
// starts with 'video/'
return startsWith(acceptHeader.value, 'video/');
}
}
}
const urlObjext = getUrlFromUri(url);
const ext = getFileExtension(urlObjext.pathname);
return (ext === 'mp4') ||
(ext === 'ogg') ||
(ext === 'webm');
}
/**
* Check if the loader can load the provided memory object.
*
* @param {object} mem The memory object.
* @returns {boolean} True if the object can be loaded.
*/
canLoadMemory(mem) {
if (typeof mem.filename !== 'undefined') {
const tmpFile = new File(['from memory'], mem.filename);
return this.canLoadFile(tmpFile);
}
return false;
}
/**
* Get the file content type needed by the loader.
*
* @returns {number} One of the 'fileContentTypes'.
*/
loadFileAs() {
return fileContentTypes.DataURL;
}
/**
* Get the url content type needed by the loader.
*
* @returns {number} One of the 'urlContentTypes'.
*/
loadUrlAs() {
return urlContentTypes.ArrayBuffer;
}
/**
* Handle a load start event.
* Default does nothing.
*
* @param {object} _event The load start event.
*/
onloadstart(_event) {}
/**
* Handle a progress event.
* Default does nothing.
*
* @param {object} _event The progress event.
*/
onprogress(_event) {}
/**
* Handle a load item event.
* Default does nothing.
*
* @param {object} _event The load item event fired
* when a file item has been loaded successfully.
*/
onloaditem(_event) {}
/**
* Handle a load event.
* Default does nothing.
*
* @param {object} _event The load event fired
* when a file has been loaded successfully.
*/
onload(_event) {}
/**
* Handle an load end event.
* Default does nothing.
*
* @param {object} _event The load end event fired
* when a file load has completed, successfully or not.
*/
onloadend(_event) {}
/**
* Handle an error event.
* Default does nothing.
*
* @param {object} _event The error event.
*/
onerror(_event) {}
/**
* Handle an abort event.
* Default does nothing.
*
* @param {object} _event The abort event.
*/
onabort(_event) {}
} // class RawVideoLoader