audiobookshelf/server/scanner/MediaProbeData.js

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const AudioFileMetadata = require('../objects/metadata/AudioMetaTags')
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class MediaProbeData {
constructor(probeData) {
this.embeddedCoverArt = null
this.format = null
this.duration = null
this.size = null
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this.audioStream = null
this.videoStream = null
this.bitRate = null
this.codec = null
this.timeBase = null
this.language = null
this.channelLayout = null
this.channels = null
this.sampleRate = null
this.chapters = []
this.audioFileMetadata = null
this.trackNumber = null
this.trackTotal = null
this.discNumber = null
this.discTotal = null
if (probeData) {
this.construct(probeData)
}
}
construct(probeData) {
for (const key in probeData) {
if (key === 'audioFileMetadata' && probeData[key]) {
this[key] = new AudioFileMetadata(probeData[key])
} else if (this[key] !== undefined) {
this[key] = probeData[key]
}
}
}
getEmbeddedCoverArt(videoStream) {
const ImageCodecs = ['mjpeg', 'jpeg', 'png']
return ImageCodecs.includes(videoStream.codec) ? videoStream.codec : null
}
setData(data) {
var audioStream = data.audio_stream
this.embeddedCoverArt = data.video_stream ? this.getEmbeddedCoverArt(data.video_stream) : null
this.format = data.format
this.duration = data.duration
this.size = data.size
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this.audioStream = audioStream
this.videoStream = this.embeddedCoverArt ? null : data.video_stream || null
this.bitRate = audioStream.bit_rate || data.bit_rate
this.codec = audioStream.codec
this.timeBase = audioStream.time_base
this.language = audioStream.language
this.channelLayout = audioStream.channel_layout
this.channels = audioStream.channels
this.sampleRate = audioStream.sample_rate
this.chapters = data.chapters || []
var metatags = {}
for (const key in data) {
if (data[key] && key.startsWith('file_tag')) {
metatags[key] = data[key]
}
}
this.audioFileMetadata = new AudioFileMetadata()
this.audioFileMetadata.setData(metatags)
// Track ID3 tag might be "3/10" or just "3"
if (this.audioFileMetadata.tagTrack) {
var trackParts = this.audioFileMetadata.tagTrack.split('/').map(part => Number(part))
if (trackParts.length > 0) {
// Fractional track numbers not supported
this.trackNumber = !isNaN(trackParts[0]) ? Math.trunc(trackParts[0]) : null
}
if (trackParts.length > 1) {
this.trackTotal = !isNaN(trackParts[1]) ? trackParts[1] : null
}
}
// Parse disc tag
if (this.audioFileMetadata.tagDisc) {
var discParts = this.audioFileMetadata.tagDisc.split('/').map(p => Number(p))
if (discParts.length > 0) {
this.discNumber = !isNaN(discParts[0]) ? Math.trunc(discParts[0]) : null
}
if (discParts.length > 1) {
this.discTotal = !isNaN(discParts[1]) ? discParts[1] : null
}
}
}
}
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module.exports = MediaProbeData