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import { ffprobe, FfprobeData } from 'fluent-ffmpeg'
import { VideoFileMetadata } from '@shared/models/videos'
/**
*
* Helpers to run ffprobe and extract data from the JSON output
*
*/
function ffprobePromise (path: string) {
return new Promise<FfprobeData>((res, rej) => {
ffprobe(path, (err, data) => {
if (err) return rej(err)
return res(data)
})
})
}
// ---------------------------------------------------------------------------
// Audio
// ---------------------------------------------------------------------------
const imageCodecs = new Set([
'ansi', 'apng', 'bintext', 'bmp', 'brender_pix', 'dpx', 'exr', 'fits', 'gem', 'gif', 'jpeg2000', 'jpgls', 'mjpeg', 'mjpegb', 'msp2',
'pam', 'pbm', 'pcx', 'pfm', 'pgm', 'pgmyuv', 'pgx', 'photocd', 'pictor', 'png', 'ppm', 'psd', 'sgi', 'sunrast', 'svg', 'targa', 'tiff',
'txd', 'webp', 'xbin', 'xbm', 'xface', 'xpm', 'xwd'
])
async function isAudioFile (path: string, existingProbe?: FfprobeData) {
const videoStream = await getVideoStream(path, existingProbe)
if (!videoStream) return true
if (imageCodecs.has(videoStream.codec_name)) return true
return false
}
async function hasAudioStream (path: string, existingProbe?: FfprobeData) {
const { audioStream } = await getAudioStream(path, existingProbe)
return !!audioStream
}
async function getAudioStream (videoPath: string, existingProbe?: FfprobeData) {
// without position, ffprobe considers the last input only
// we make it consider the first input only
// if you pass a file path to pos, then ffprobe acts on that file directly
const data = existingProbe || await ffprobePromise(videoPath)
if (Array.isArray(data.streams)) {
const audioStream = data.streams.find(stream => stream['codec_type'] === 'audio')
if (audioStream) {
return {
absolutePath: data.format.filename,
audioStream,
bitrate: parseInt(audioStream['bit_rate'] + '', 10)
}
}
}
return { absolutePath: data.format.filename }
}
function getMaxAudioBitrate (type: 'aac' | 'mp3' | string, bitrate: number) {
const maxKBitrate = 384
const kToBits = (kbits: number) => kbits * 1000
// If we did not manage to get the bitrate, use an average value
if (!bitrate) return 256
if (type === 'aac') {
switch (true) {
case bitrate > kToBits(maxKBitrate):
return maxKBitrate
default:
return -1 // we interpret it as a signal to copy the audio stream as is
}
}
/*
a 192kbit/sec mp3 doesn't hold as much information as a 192kbit/sec aac.
That's why, when using aac, we can go to lower kbit/sec. The equivalences
made here are not made to be accurate, especially with good mp3 encoders.
*/
switch (true) {
case bitrate <= kToBits(192):
return 128
case bitrate <= kToBits(384):
return 256
default:
return maxKBitrate
}
}
// ---------------------------------------------------------------------------
// Video
// ---------------------------------------------------------------------------
async function getVideoStreamDimensionsInfo (path: string, existingProbe?: FfprobeData) {
const videoStream = await getVideoStream(path, existingProbe)
if (!videoStream) return undefined
return {
width: videoStream.width,
height: videoStream.height,
ratio: Math.max(videoStream.height, videoStream.width) / Math.min(videoStream.height, videoStream.width),
resolution: Math.min(videoStream.height, videoStream.width),
isPortraitMode: videoStream.height > videoStream.width
}
}
async function getVideoStreamFPS (path: string, existingProbe?: FfprobeData) {
const videoStream = await getVideoStream(path, existingProbe)
if (!videoStream) return 0
for (const key of [ 'avg_frame_rate', 'r_frame_rate' ]) {
const valuesText: string = videoStream[key]
if (!valuesText) continue
const [ frames, seconds ] = valuesText.split('/')
if (!frames || !seconds) continue
const result = parseInt(frames, 10) / parseInt(seconds, 10)
if (result > 0) return Math.round(result)
}
return 0
}
async function buildFileMetadata (path: string, existingProbe?: FfprobeData) {
const metadata = existingProbe || await ffprobePromise(path)
return new VideoFileMetadata(metadata)
}
async function getVideoStreamBitrate (path: string, existingProbe?: FfprobeData): Promise<number> {
const metadata = await buildFileMetadata(path, existingProbe)
let bitrate = metadata.format.bit_rate as number
if (bitrate && !isNaN(bitrate)) return bitrate
const videoStream = await getVideoStream(path, existingProbe)
if (!videoStream) return undefined
bitrate = videoStream?.bit_rate
if (bitrate && !isNaN(bitrate)) return bitrate
return undefined
}
async function getVideoStreamDuration (path: string, existingProbe?: FfprobeData) {
const metadata = await buildFileMetadata(path, existingProbe)
return Math.round(metadata.format.duration)
}
async function getVideoStream (path: string, existingProbe?: FfprobeData) {
const metadata = await buildFileMetadata(path, existingProbe)
return metadata.streams.find(s => s.codec_type === 'video')
}
// ---------------------------------------------------------------------------
export {
getVideoStreamDimensionsInfo,
buildFileMetadata,
getMaxAudioBitrate,
getVideoStream,
getVideoStreamDuration,
getAudioStream,
getVideoStreamFPS,
isAudioFile,
ffprobePromise,
getVideoStreamBitrate,
hasAudioStream
}
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