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FfmpegCodec,
FfmpegCodecType,
FfmpegCodecs,
FfmpegEncoderType,
FfmpegEncoders,
FfmpegFilterStreamType,
FfmpegFilters,
FfmpegFormats,
InputCodecInformation,
InputStreamCodecInformation,
ProgressInformation
} from './data-types'
import {
capCodecDecodersRegexp,
capCodecEncodersRegexp,
capCodecRegexp,
capEncoderRegexp,
capFilterRegexp,
capFormatRegexp,
codecAudioRegexp,
codecDurRegexp,
codecEndRegexp,
codecInputRegexp,
codecOutputRegexp,
codecVideoRegexp
} from './regexp'
/**
* Extract an error message from ffmpeg stderr
*
* @param stderrLines stderr output from ffmpeg as an array of lines
* @returns error message
*/
export function extractErrorMessage(stderrLines: string[]): string {
// Return the last block of lines that don't start with a space or square bracket
return stderrLines
.reduce((messages: string[], message: string): string[] => {
if (message.charAt(0) === ' ' || message.charAt(0) === '[') {
return []
} else {
messages.push(message)
return messages
}
}, [])
.join('\n')
}
/**
* Extract progress information from ffmpeg stderr
*
* @param stderrLine a line from ffmpeg stderr
* @returns progress information
*/
export function extractProgress(
stderrLine: string
): ProgressInformation | undefined {
let parts = stderrLine.replace(/=\s+/g, '=').trim().split(' ')
let progress: ProgressInformation = {}
for (let part of parts) {
let [key, value] = part.split('=', 2)
if (value === undefined) {
// Not a progress line
return
}
if (key === 'frame' || key === 'fps') {
progress[key] = Number(value)
} else if (key === 'bitrate') {
progress.bitrate = Number(value.replace('kbits/s', ''))
} else if (key === 'size' || key === 'Lsize') {
progress.size = Number(value.replace('kB', ''))
} else if (key === 'time') {
progress.time = value
} else if (key === 'speed') {
progress.speed = Number(value.replace('x', ''))
}
}
return progress
}
export class CodecDataExtractor {
inputs: InputStreamCodecInformation[]
index: number
inInput: boolean
done: boolean
callback: (data: InputCodecInformation) => any
constructor(callback: (data: InputCodecInformation) => any) {
this.inputs = []
this.index = -1
this.inInput = false
this.done = false
this.callback = callback
}
// TODO better output for multiple inputs / multi-stream inputs !
processLine(line: string) {
let matchFormat = line.match(codecInputRegexp)
if (matchFormat) {
this.inInput = true
this.index++
this.inputs[this.index] = {
format: matchFormat[1]
}
return
}
if (this.inInput) {
let durationMatch = line.match(codecDurRegexp)
if (durationMatch) {
this.inputs[this.index].duration = durationMatch[1]
return
}
let audioMatch = line.match(codecAudioRegexp)
if (audioMatch) {
this.inputs[this.index].audio = audioMatch[1].split(', ')[0]
this.inputs[this.index].audioDetails = audioMatch[1]
return
}
let videoMatch = line.match(codecVideoRegexp)
if (videoMatch) {
this.inputs[this.index].video = videoMatch[1].split(', ')[0]
this.inputs[this.index].videoDetails = videoMatch[1]
return
}
}
if (codecOutputRegexp.test(line)) {
this.inInput = false
}
if (codecEndRegexp.test(line)) {
this.done = true
let { callback } = this
callback(this.inputs)
}
}
}
function parseCodecType(type: string): FfmpegCodecType {
if (type === 'A') return 'audio'
if (type === 'V') return 'video'
if (type === 'S') return 'subtitle'
if (type === 'D') return 'data'
return 'attachment'
}
export function extractCodecs(lines: string[]): FfmpegCodecs {
let codecs: FfmpegCodecs = {}
for (let line of lines) {
let match = line.match(capCodecRegexp)
if (match) {
let [, decode, encode, type, intra, lossy, lossless, name, description] =
match
let codec: FfmpegCodec = {
description,
type: parseCodecType(type),
canEncode: encode === 'E',
canDecode: decode === 'D',
intraFrame: intra === 'I',
lossy: lossy === 'L',
lossless: lossless === 'S'
}
if (decode === 'D') {
let decoders = description.match(capCodecDecodersRegexp)
if (decoders) {
codec.decoders = decoders[1].trim().split(' ')
codec.description = codec.description
.replace(capCodecDecodersRegexp, '')
.trim()
}
}
if (encode === 'E') {
let encoders = description.match(capCodecEncodersRegexp)
if (encoders) {
codec.encoders = encoders[1].trim().split(' ')
codec.description = codec.description
.replace(capCodecEncodersRegexp, '')
.trim()
}
}
codecs[name] = codec
}
}
return codecs
}
export function extractFormats(lines: string[]): FfmpegFormats {
let formats: FfmpegFormats = {}
for (let line of lines) {
let match = line.match(capFormatRegexp)
if (match) {
let [, demux, mux, name, description] = match
formats[name] = {
description,
canMux: mux === 'E',
canDemux: demux === 'D'
}
}
}
return formats
}
function parseFilterStreams(
streams: string
): FfmpegFilterStreamType[] | 'dynamic' {
if (streams === '|') {
return []
} else if (streams === 'N') {
return 'dynamic'
} else {
return [...streams].map((s) => (s === 'A' ? 'audio' : 'video'))
}
}
export function extractFilters(lines: string[]): FfmpegFilters {
let filters: FfmpegFilters = {}
for (let line of lines) {
let match = line.match(capFilterRegexp)
if (match) {
let [, timeline, slice, command, name, inputs, outputs, description] =
match
filters[name] = {
description,
inputs: parseFilterStreams(inputs),
outputs: parseFilterStreams(outputs)
}
}
}
return filters
}
function parseEncoderType(type: string): FfmpegEncoderType {
if (type === 'A') return 'audio'
if (type === 'V') return 'video'
return 'subtitle'
}
export function extractEncoders(lines: string[]): FfmpegEncoders {
let encoders: FfmpegEncoders = {}
for (let line of lines) {
let match = line.match(capEncoderRegexp)
if (match) {
let [, type, frame, slice, exp, band, direct, name, description] = match
encoders[name] = {
description,
type: parseEncoderType(type),
frameMultithreading: frame === 'F',
sliceMultithreading: slice === 'S',
experimental: exp === 'X',
drawHorizBand: band === 'B',
directRendering: direct === 'D'
}
}
}
return encoders
}
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