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[MSS] Map subTypes to MPEG-DASH AdaptationSet role and accessibility #2509

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Apr 3, 2018
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[MSS] Map subTypes to MPEG-DASH AdaptationSet role and accessibility #2509

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29 changes: 29 additions & 0 deletions src/mss/parser/MssParser.js
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,15 @@ function MssParser(config) {

const TIME_SCALE_100_NANOSECOND_UNIT = 10000000.0;
const SUPPORTED_CODECS = ['AAC', 'AACL', 'AVC1', 'H264', 'TTML', 'DFXP'];
// MPEG-DASH Role and accessibility mapping according to ETSI TS 103 285 v1.1.1 (section 7.1.2)
const ROLE = {
'SUBT': 'alternate',
'CAPT': 'alternate', // 'CAPT' is commonly equivalent to 'SUBT'
'DESC': 'main'
};
const ACCESSIBILITY = {
'DESC': '2'
};
const samplingFrequencyIndex = {
96000: 0x0,
88200: 0x1,
Expand Down Expand Up @@ -114,6 +123,26 @@ function MssParser(config) {
adaptationSet.maxWidth = streamIndex.getAttribute('MaxWidth');
adaptationSet.maxHeight = streamIndex.getAttribute('MaxHeight');

// Map subTypes to MPEG-DASH AdaptationSet role and accessibility (see ETSI TS 103 285 v1.1.1, section 7.1.2)
if (adaptationSet.subType) {
if (ROLE[adaptationSet.subType]) {
let role = {
schemeIdUri: 'urn:mpeg:dash:role:2011',
value: ROLE[adaptationSet.subType]
};
adaptationSet.Role = role;
adaptationSet.Role_asArray = [role];
}
if (ACCESSIBILITY[adaptationSet.subType]) {
let accessibility = {
schemeIdUri: 'urn:tva:metadata:cs:AudioPurposeCS:2007',
value: ACCESSIBILITY[adaptationSet.subType]
};
adaptationSet.Accessibility = accessibility;
adaptationSet.Accessibility_asArray = [accessibility];
}
}

// Create a SegmentTemplate with a SegmentTimeline
segmentTemplate = mapSegmentTemplate(streamIndex);

Expand Down