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import { protocolRegexp } from './utils/regexp'
import { formatBitrate } from './utils/formatting'
import { FilterChain, generateFilterChain } from './utils/filters'
export type OutputAudioOptions = {
codec?: string
bitrate?: string | number
channels?: number
frequency?: number
quality?: number
filters?: FilterChain
}
export type OutputVideoOptions = {
codec?: string
bitrate?: string | number
constantBitrate?: boolean
fps?: number
frames?: number
filters?: FilterChain
}
type OutputTarget = string | Writable
export type OutputOptions = {
target: OutputTarget
seek?: string | number
duration?: string | number
format?: string
map?: string
customArgs?: string[]
audio?: false | OutputAudioOptions
video?: false | OutputVideoOptions
}
export type OutputDefinition = OutputTarget | OutputOptions
export class FfmpegOutput implements OutputOptions {
target: OutputTarget
seek?: string | number
duration?: string | number
format?: string
map?: string
customArgs: string[]
audio?: false | OutputAudioOptions
video?: false | OutputVideoOptions
constructor(options: OutputDefinition) {
if (typeof options === 'string' || options instanceof Writable) {
options = { target: options }
}
this.target = options.target
this.seek = options.seek
this.duration = options.duration
this.format = options.format
this.map = options.map
this.customArgs = options.customArgs || []
this.audio = options.audio
this.video = options.video
}
get isStream(): boolean {
return this.target instanceof Writable
}
get isLocalFile(): boolean {
if (this.target instanceof Writable) {
return false
} else {
let protocol = this.target.match(protocolRegexp)
return !protocol || protocol[1] === 'file'
}
}
#getAudioOptions(): string[] {
let options: string[] = []
if (this.audio === false) {
options.push('-an')
} else if (this.audio) {
if (this.audio.codec) {
options.push('-acodec', this.audio.codec)
}
if (this.audio.bitrate) {
options.push('-b:a', formatBitrate(this.audio.bitrate))
}
if (this.audio.channels) {
options.push('-ac', this.audio.channels.toString())
}
if (this.audio.frequency) {
options.push('-ar', this.audio.frequency.toString())
}
if (this.audio.quality) {
options.push('-aq', this.audio.quality.toString())
}
if (this.audio.filters) {
options.push('-filter:a', generateFilterChain(this.audio.filters))
}
}
return options
}
#getVideoOptions(): string[] {
let options: string[] = []
if (this.video === false) {
options.push('-vn')
} else if (this.video) {
if (this.video.codec) {
options.push('-vcodec', this.video.codec)
}
if (this.video.bitrate) {
let bitrate = formatBitrate(this.video.bitrate)
options.push('-b:v', bitrate)
if (this.video.constantBitrate) {
options.push(
'-minrate',
bitrate,
'-maxrate',
bitrate,
'-bufsize',
bitrate
)
}
}
if (this.video.fps) {
options.push('-r', this.video.fps.toString())
}
if (this.video.frames) {
options.push('-vframes', this.video.frames.toString())
}
if (this.video.filters) {
options.push('-filter:v', generateFilterChain(this.video.filters))
}
// todo size filters
}
return options
}
#getOptions(): string[] {
let options: string[] = []
if (this.seek) {
options.push('-ss', this.seek.toString())
}
if (this.duration) {
options.push('-t', this.duration.toString())
}
if (this.format) {
options.push('-f', this.format)
}
if (this.map) {
options.push('-map', this.map)
}
return options
}
#getOutputString(): string {
if (typeof this.target === 'string') {
return this.target
} else {
return 'pipe:1'
}
}
getFfmpegArguments(): string[] {
return [
...this.#getAudioOptions(),
...this.#getVideoOptions(),
...this.#getOptions(),
...this.customArgs,
this.#getOutputString()
]
}
}
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