@eluvio/elv-utils-js/lib/concerns/libs/Offering.js

Utilities for the Eluvio Content Fabric

// code related to working with offerings

const fraction = require('@eluvio/elv-js-helpers/Conversion/fraction')
const fracStrToNum = require('@eluvio/elv-js-helpers/Conversion/fracStrToNum')

const compare = require('@eluvio/elv-js-helpers/Functional/compare')

const Logger = require('../Logger')

const blueprint = {
  name: 'Offering',
  concerns: [Logger]
}

const durationFrac = ({offering}) => fraction(durationRatStr({offering}))

const durationNum = ({offering}) => fracStrToNum(durationRatStr({offering}))

const durationRatStr = ({offering}) => offering.media_struct.duration_rat

const firstVideoStreamKey = ({offering}) => {
  // sort alphabetically by stream key
  for(const [streamKey, stream] of sortedStreamsKV({offering})) {
    if(stream.codec_type === 'video') return streamKey
  }
  throw new Error('No video stream found in offering')
}

const sortedStreamsKV =  ({offering}) => Object.entries(offering.media_struct.streams).sort((a,b) => compare(a[0], b[0]))

const New = () => {

  // instance interface
  return {}
}

module.exports = {
  blueprint,
  durationFrac,
  durationNum,
  durationRatStr,
  firstVideoStreamKey,
  sortedStreamsKV,
  New
}