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prober.js
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prober.js
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const ffprobe = require('../libs/nodeFfprobe')
const MediaProbeData = require('../scanner/MediaProbeData')
const Logger = require('../Logger')
function tryGrabBitRate(stream, all_streams, total_bit_rate) {
if (!isNaN(stream.bit_rate) && stream.bit_rate) {
return Number(stream.bit_rate)
}
if (!stream.tags) {
return null
}
// Attempt to get bitrate from bps tags
var bps = stream.tags.BPS || stream.tags['BPS-eng'] || stream.tags['BPS_eng']
if (bps && !isNaN(bps)) {
return Number(bps)
}
var tagDuration = stream.tags.DURATION || stream.tags['DURATION-eng'] || stream.tags['DURATION_eng']
var tagBytes = stream.tags.NUMBER_OF_BYTES || stream.tags['NUMBER_OF_BYTES-eng'] || stream.tags['NUMBER_OF_BYTES_eng']
if (tagDuration && tagBytes && !isNaN(tagDuration) && !isNaN(tagBytes)) {
var bps = Math.floor(Number(tagBytes) * 8 / Number(tagDuration))
if (bps && !isNaN(bps)) {
return bps
}
}
if (total_bit_rate && stream.codec_type === 'video') {
var estimated_bit_rate = total_bit_rate
all_streams.forEach((stream) => {
if (stream.bit_rate && !isNaN(stream.bit_rate)) {
estimated_bit_rate -= Number(stream.bit_rate)
}
})
if (!all_streams.find(s => s.codec_type === 'audio' && s.bit_rate && Number(s.bit_rate) > estimated_bit_rate)) {
return estimated_bit_rate
} else {
return total_bit_rate
}
} else if (stream.codec_type === 'audio') {
return 112000
} else {
return 0
}
}
function tryGrabFrameRate(stream) {
var avgFrameRate = stream.avg_frame_rate || stream.r_frame_rate
if (!avgFrameRate) return null
var parts = avgFrameRate.split('/')
if (parts.length === 2) {
avgFrameRate = Number(parts[0]) / Number(parts[1])
} else {
avgFrameRate = Number(parts[0])
}
if (!isNaN(avgFrameRate)) return avgFrameRate
return null
}
function tryGrabSampleRate(stream) {
var sample_rate = stream.sample_rate
if (!isNaN(sample_rate)) return Number(sample_rate)
return null
}
function tryGrabChannelLayout(stream) {
var layout = stream.channel_layout
if (!layout) return null
return String(layout).split('(').shift()
}
function tryGrabTags(stream, ...tags) {
if (!stream.tags) return null
for (let i = 0; i < tags.length; i++) {
var value = stream.tags[tags[i]] || stream.tags[tags[i].toUpperCase()]
if (value && value.trim()) return value.trim()
}
return null
}
function parseMediaStreamInfo(stream, all_streams, total_bit_rate) {
var info = {
index: stream.index,
type: stream.codec_type,
codec: stream.codec_name || null,
codec_long: stream.codec_long_name || null,
codec_time_base: stream.codec_time_base || null,
time_base: stream.time_base || null,
bit_rate: tryGrabBitRate(stream, all_streams, total_bit_rate),
language: tryGrabTags(stream, 'language'),
title: tryGrabTags(stream, 'title')
}
if (stream.tags) info.tags = stream.tags
if (info.type === 'audio' || info.type === 'subtitle') {
var disposition = stream.disposition || {}
info.is_default = disposition.default === 1 || disposition.default === '1'
}
if (info.type === 'video') {
info.profile = stream.profile || null
info.is_avc = (stream.is_avc !== '0' && stream.is_avc !== 'false')
info.pix_fmt = stream.pix_fmt || null
info.frame_rate = tryGrabFrameRate(stream)
info.width = !isNaN(stream.width) ? Number(stream.width) : null
info.height = !isNaN(stream.height) ? Number(stream.height) : null
info.color_range = stream.color_range || null
info.color_space = stream.color_space || null
info.color_transfer = stream.color_transfer || null
info.color_primaries = stream.color_primaries || null
} else if (stream.codec_type === 'audio') {
info.channels = stream.channels || null
info.sample_rate = tryGrabSampleRate(stream)
info.channel_layout = tryGrabChannelLayout(stream)
}
return info
}
function isNullOrNaN(val) {
return val === null || isNaN(val)
}
/* Example chapter object
* {
"id": 71,
"time_base": "1/1000",
"start": 80792671,
"start_time": "80792.671000",
"end": 81084755,
"end_time": "81084.755000",
"tags": {
"title": "072"
}
* }
*/
function parseChapters(chapters) {
if (!chapters) return []
return chapters.map(chap => {
var title = chap['TAG:title'] || chap.title || ''
if (!title && chap.tags && chap.tags.title) title = chap.tags.title
var timebase = chap.time_base && chap.time_base.includes('/') ? Number(chap.time_base.split('/')[1]) : 1
var start = !isNullOrNaN(chap.start_time) ? Number(chap.start_time) : !isNullOrNaN(chap.start) ? Number(chap.start) / timebase : 0
var end = !isNullOrNaN(chap.end_time) ? Number(chap.end_time) : !isNullOrNaN(chap.end) ? Number(chap.end) / timebase : 0
return {
id: chap.id,
start,
end,
title
}
})
}
function parseTags(format, verbose) {
if (!format.tags) {
return {}
}
if (verbose) {
Logger.debug('Tags', format.tags)
}
const tags = {
file_tag_encoder: tryGrabTags(format, 'encoder', 'tsse', 'tss'),
file_tag_encodedby: tryGrabTags(format, 'encoded_by', 'tenc', 'ten'),
file_tag_title: tryGrabTags(format, 'title', 'tit2', 'tt2'),
file_tag_subtitle: tryGrabTags(format, 'subtitle', 'tit3', 'tt3'),
file_tag_track: tryGrabTags(format, 'track', 'trck', 'trk'),
file_tag_disc: tryGrabTags(format, 'discnumber', 'disc', 'disk', 'tpos'),
file_tag_album: tryGrabTags(format, 'album', 'talb', 'tal'),
file_tag_artist: tryGrabTags(format, 'artist', 'tpe1', 'tp1'),
file_tag_albumartist: tryGrabTags(format, 'albumartist', 'album_artist', 'tpe2'),
file_tag_date: tryGrabTags(format, 'date', 'tyer', 'tye'),
file_tag_composer: tryGrabTags(format, 'composer', 'tcom', 'tcm'),
file_tag_publisher: tryGrabTags(format, 'publisher', 'tpub', 'tpb'),
file_tag_comment: tryGrabTags(format, 'comment', 'comm', 'com'),
file_tag_description: tryGrabTags(format, 'description', 'desc'),
file_tag_genre: tryGrabTags(format, 'genre', 'tcon', 'tco'),
file_tag_series: tryGrabTags(format, 'series', 'show', 'mvin'),
file_tag_seriespart: tryGrabTags(format, 'series-part', 'episode_id', 'mvnm'),
file_tag_isbn: tryGrabTags(format, 'isbn'),
file_tag_language: tryGrabTags(format, 'language', 'lang'),
file_tag_asin: tryGrabTags(format, 'asin'),
// Not sure if these are actually used yet or not
file_tag_creation_time: tryGrabTags(format, 'creation_time'),
file_tag_wwwaudiofile: tryGrabTags(format, 'wwwaudiofile', 'woaf', 'waf'),
file_tag_contentgroup: tryGrabTags(format, 'contentgroup', 'tit1', 'tt1'),
file_tag_releasetime: tryGrabTags(format, 'releasetime', 'tdrl'),
file_tag_movementname: tryGrabTags(format, 'movementname', 'mvnm'),
file_tag_movement: tryGrabTags(format, 'movement', 'mvin'),
file_tag_genre1: tryGrabTags(format, 'tmp_genre1', 'genre1'),
file_tag_genre2: tryGrabTags(format, 'tmp_genre2', 'genre2'),
file_tag_overdrive_media_marker: tryGrabTags(format, 'OverDrive MediaMarkers'),
}
for (const key in tags) {
if (!tags[key]) {
delete tags[key]
}
}
return tags
}
function getDefaultAudioStream(audioStreams) {
if (!audioStreams || !audioStreams.length) return null
if (audioStreams.length === 1) return audioStreams[0]
var defaultStream = audioStreams.find(a => a.is_default)
if (!defaultStream) return audioStreams[0]
return defaultStream
}
function parseProbeData(data, verbose = false) {
try {
var { format, streams, chapters } = data
var sizeBytes = !isNaN(format.size) ? Number(format.size) : null
var sizeMb = sizeBytes !== null ? Number((sizeBytes / (1024 * 1024)).toFixed(2)) : null
// Logger.debug('Parsing Data for', Path.basename(format.filename))
var tags = parseTags(format, verbose)
var cleanedData = {
format: format.format_long_name || format.name || 'Unknown',
duration: !isNaN(format.duration) ? Number(format.duration) : null,
size: sizeBytes,
sizeMb,
bit_rate: !isNaN(format.bit_rate) ? Number(format.bit_rate) : null,
...tags
}
if (verbose && format.tags) {
cleanedData.rawTags = format.tags
}
const cleaned_streams = streams.map(s => parseMediaStreamInfo(s, streams, cleanedData.bit_rate))
cleanedData.video_stream = cleaned_streams.find(s => s.type === 'video')
var audioStreams = cleaned_streams.filter(s => s.type === 'audio')
cleanedData.audio_stream = getDefaultAudioStream(audioStreams)
if (cleanedData.audio_stream && cleanedData.video_stream) {
var videoBitrate = cleanedData.video_stream.bit_rate
// If audio stream bitrate larger then video, most likely incorrect
if (cleanedData.audio_stream.bit_rate > videoBitrate) {
cleanedData.video_stream.bit_rate = cleanedData.bit_rate
}
}
// If format does not have tags, check audio stream (https://github.com/advplyr/audiobookshelf/issues/256)
if (!format.tags && cleanedData.audio_stream && cleanedData.audio_stream.tags) {
var tags = parseTags(cleanedData.audio_stream)
cleanedData = {
...cleanedData,
...tags
}
}
cleanedData.chapters = parseChapters(chapters)
return cleanedData
} catch (error) {
console.error('Parse failed', error)
return null
}
}
// Updated probe returns MediaProbeData object
function probe(filepath, verbose = false) {
if (process.env.FFPROBE_PATH) {
ffprobe.FFPROBE_PATH = process.env.FFPROBE_PATH
}
return ffprobe(filepath)
.then(raw => {
if (raw.error) {
return {
error: raw.error.string
}
}
var rawProbeData = parseProbeData(raw, verbose)
if (!rawProbeData || (!rawProbeData.audio_stream && !rawProbeData.video_stream)) {
return {
error: rawProbeData ? 'Invalid media file: no audio or video streams found' : 'Probe Failed'
}
} else {
var probeData = new MediaProbeData()
probeData.setData(rawProbeData)
return probeData
}
})
.catch((err) => {
return {
error: err
}
})
}
module.exports.probe = probe