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import Constants from '../streaming/constants/Constants.js';
import FactoryMaker from '../core/FactoryMaker.js';
import FragmentRequest from '../streaming/vo/FragmentRequest.js';
import URLLoader from '../streaming/net/URLLoader.js';
import DashJSError from '../streaming/vo/DashJSError.js';
import FullSegment from '../dash/vo/FullSegment.js';
function WebmSegmentBaseLoader() {
const context = this.context;
let instance,
logger,
WebM,
errHandler,
dashMetrics,
mediaPlayerModel,
urlLoader,
errors,
baseURLController;
function setup() {
WebM = {
EBML: {
tag: 0x1A45DFA3,
required: true
},
Segment: {
tag: 0x18538067,
required: true,
SeekHead: {
tag: 0x114D9B74,
required: true
},
Info: {
tag: 0x1549A966,
required: true,
TimecodeScale: {
tag: 0x2AD7B1,
required: true,
parse: 'getMatroskaUint'
},
Duration: {
tag: 0x4489,
required: true,
parse: 'getMatroskaFloat'
}
},
Tracks: {
tag: 0x1654AE6B,
required: true
},
Cues: {
tag: 0x1C53BB6B,
required: true,
CuePoint: {
tag: 0xBB,
required: true,
CueTime: {
tag: 0xB3,
required: true,
parse: 'getMatroskaUint'
},
CueTrackPositions: {
tag: 0xB7,
required: true,
CueTrack: {
tag: 0xF7,
required: true,
parse: 'getMatroskaUint'
},
CueClusterPosition: {
tag: 0xF1,
required: true,
parse: 'getMatroskaUint'
}
}
}
}
},
Void: {
tag: 0xEC,
required: true
}
};
}
function initialize() {
urlLoader = URLLoader(context).create({
errHandler: errHandler,
dashMetrics: dashMetrics,
mediaPlayerModel: mediaPlayerModel,
errors: errors
});
}
function setConfig(config) {
if (!config.baseURLController || !config.dashMetrics || !config.mediaPlayerModel || !config.errHandler) {
throw new Error(Constants.MISSING_CONFIG_ERROR);
}
baseURLController = config.baseURLController;
dashMetrics = config.dashMetrics;
mediaPlayerModel = config.mediaPlayerModel;
errHandler = config.errHandler;
errors = config.errors;
logger = config.debug.getLogger(instance);
}
function parseCues(ab) {
let cues = [];
let ebmlParser = EBMLParser(context).create({
data: ab
});
let cue,
cueTrack;
ebmlParser.consumeTagAndSize(WebM.Segment.Cues);
while (ebmlParser.moreData() &&
ebmlParser.consumeTagAndSize(WebM.Segment.Cues.CuePoint, true)) {
cue = {};
cue.CueTime = ebmlParser.parseTag(WebM.Segment.Cues.CuePoint.CueTime);
cue.CueTracks = [];
while (ebmlParser.moreData() &&
ebmlParser.consumeTag(WebM.Segment.Cues.CuePoint.CueTrackPositions, true)) {
const cueTrackPositionSize = ebmlParser.getMatroskaCodedNum();
const startPos = ebmlParser.getPos();
cueTrack = {};
cueTrack.Track = ebmlParser.parseTag(WebM.Segment.Cues.CuePoint.CueTrackPositions.CueTrack);
if (cueTrack.Track === 0) {
throw new Error('Cue track cannot be 0');
}
cueTrack.ClusterPosition =
ebmlParser.parseTag(WebM.Segment.Cues.CuePoint.CueTrackPositions.CueClusterPosition);
cue.CueTracks.push(cueTrack);
// we're not interested any other elements - skip remaining bytes
ebmlParser.setPos(startPos + cueTrackPositionSize);
}
if (cue.CueTracks.length === 0) {
throw new Error('Mandatory cuetrack not found');
}
cues.push(cue);
}
if (cues.length === 0) {
throw new Error('mandatory cuepoint not found');
}
return cues;
}
function parseSegments(data, segmentStart, segmentEnd, segmentDuration) {
let duration,
parsed,
segments,
segment,
i,
len,
start,
end;
parsed = parseCues(data);
segments = [];
// we are assuming one cue track per cue point
// both duration and media range require the i + 1 segment
// the final segment has to use global segment parameters
for (i = 0, len = parsed.length; i < len; i += 1) {
segment = new FullSegment();
duration = 0;
if (i < parsed.length - 1) {
duration = parsed[i + 1].CueTime - parsed[i].CueTime;
} else {
duration = segmentDuration - parsed[i].CueTime;
}
// note that we don't explicitly set segment.media as this will be
// computed when all BaseURLs are resolved later
segment.duration = duration;
segment.startTime = parsed[i].CueTime;
segment.timescale = 1000; // hardcoded for ms
start = parsed[i].CueTracks[0].ClusterPosition + segmentStart;
if (i < parsed.length - 1) {
end = parsed[i + 1].CueTracks[0].ClusterPosition + segmentStart - 1;
} else {
end = segmentEnd - 1;
}
segment.mediaRange = start + '-' + end;
segments.push(segment);
}
logger.debug('Parsed cues: ' + segments.length + ' cues.');
return segments;
}
function parseEbmlHeader(data, media, theRange, callback) {
if (!data || data.byteLength === 0) {
callback(null);
return;
}
let ebmlParser = EBMLParser(context).create({
data: data
});
let duration,
segments,
segmentEnd,
segmentStart;
let parts = theRange ? theRange.split('-') : null;
let request = null;
let info = {
url: media,
range: {
start: parts ? parseFloat(parts[0]) : null,
end: parts ? parseFloat(parts[1]) : null
},
request: request
};
logger.debug('Parse EBML header: ' + info.url);
// skip over the header itself
ebmlParser.skipOverElement(WebM.EBML);
ebmlParser.consumeTag(WebM.Segment);
// segments start here
segmentEnd = ebmlParser.getMatroskaCodedNum();
segmentEnd += ebmlParser.getPos();
segmentStart = ebmlParser.getPos();
// skip over any top level elements to get to the segment info
while (ebmlParser.moreData() &&
!ebmlParser.consumeTagAndSize(WebM.Segment.Info, true)) {
if (!(ebmlParser.skipOverElement(WebM.Segment.SeekHead, true) ||
ebmlParser.skipOverElement(WebM.Segment.Tracks, true) ||
ebmlParser.skipOverElement(WebM.Segment.Cues, true) ||
ebmlParser.skipOverElement(WebM.Void, true))) {
throw new Error('no valid top level element found');
}
}
// we only need one thing in segment info, duration
while (duration === undefined) {
let infoTag = ebmlParser.getMatroskaCodedNum(true);
let infoElementSize = ebmlParser.getMatroskaCodedNum();
switch (infoTag) {
case WebM.Segment.Info.Duration.tag:
duration = ebmlParser[WebM.Segment.Info.Duration.parse](infoElementSize);
break;
default:
ebmlParser.setPos(ebmlParser.getPos() + infoElementSize);
break;
}
}
// once we have what we need from segment info, we jump right to the
// cues
request = _getFragmentRequest(info);
const onload = function (response) {
segments = parseSegments(response, segmentStart, segmentEnd, duration);
callback(segments);
};
const onloadend = function () {
logger.error('Download Error: Cues ' + info.url);
callback(null);
};
urlLoader.load({
request: request,
success: onload,
error: onloadend
});
logger.debug('Perform cues load: ' + info.url + ' bytes=' + info.range.start + '-' + info.range.end);
}
function loadInitialization(representation, mediaType) {
return new Promise((resolve) => {
let request = null;
let baseUrl = representation ? baseURLController.resolve(representation.path) : null;
let initRange = representation ? representation.range.split('-') : null;
let info = {
range: {
start: initRange ? parseFloat(initRange[0]) : null,
end: initRange ? parseFloat(initRange[1]) : null
},
request: request,
url: baseUrl ? baseUrl.url : undefined,
init: true,
mediaType: mediaType
};
logger.info('Start loading initialization.');
request = _getFragmentRequest(info);
const onload = function () {
// note that we don't explicitly set rep.initialization as this
// will be computed when all BaseURLs are resolved later
resolve(representation);
};
const onloadend = function () {
resolve(representation);
};
urlLoader.load({
request: request,
success: onload,
error: onloadend
});
logger.debug('Perform init load: ' + info.url);
});
}
function loadSegments(representation, mediaType, theRange) {
return new Promise((resolve) => {
let request = null;
let baseUrl = representation ? baseURLController.resolve(representation.path) : null;
let media = baseUrl ? baseUrl.url : undefined;
let bytesToLoad = 8192;
let info = {
bytesLoaded: 0,
bytesToLoad: bytesToLoad,
range: {
start: 0,
end: bytesToLoad
},
request: request,
url: media,
init: false,
mediaType: mediaType,
representation
};
request = _getFragmentRequest(info);
// first load the header, but preserve the manifest range so we can
// load the cues after parsing the header
// NOTE: we expect segment info to appear in the first 8192 bytes
logger.debug('Parsing ebml header');
const onload = function (response) {
parseEbmlHeader(response, media, theRange, function (segments) {
resolve({
segments: segments,
representation: representation,
error: segments ? undefined : new DashJSError(errors.SEGMENT_BASE_LOADER_ERROR_CODE, errors.SEGMENT_BASE_LOADER_ERROR_MESSAGE)
});
});
};
const onloadend = function () {
resolve({
representation: representation,
error: new DashJSError(errors.SEGMENT_BASE_LOADER_ERROR_CODE, errors.SEGMENT_BASE_LOADER_ERROR_MESSAGE)
});
};
urlLoader.load({
request: request,
success: onload,
error: onloadend
});
});
}
function _getFragmentRequest(info) {
const request = new FragmentRequest();
request.setInfo(info);
return request;
}
function reset() {
if (urlLoader) {
urlLoader.abort();
urlLoader = null;
}
}
instance = {
setConfig,
initialize,
loadInitialization,
loadSegments,
reset
};
setup();
return instance;
}
WebmSegmentBaseLoader.__dashjs_factory_name = 'WebmSegmentBaseLoader';
export default FactoryMaker.getSingletonFactory(WebmSegmentBaseLoader);
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