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        <h1><a href="../index.html">All files</a> / <a href="index.html">src</a> process.ts</h1>
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                <span class="strong">86.93% </span>
                <span class="quiet">Statements</span>
                <span class='fraction'>153/176</span>
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                <span class="strong">87.87% </span>
                <span class="quiet">Branches</span>
                <span class='fraction'>29/33</span>
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                <span class="strong">100% </span>
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                <span class='fraction'>4/4</span>
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            <div class='fl pad1y space-right2'>
                <span class="strong">86.93% </span>
                <span class="quiet">Lines</span>
                <span class='fraction'>153/176</span>
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<span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js">import { spawn } from 'node:child_process'
&nbsp;
import { isWindows } from './utils/platform'
import {
  extractErrorMessage,
  extractProgress,
  CodecDataExtractor
} from './utils/parsing'
import LineBuffer from './utils/line-buffer'
import { InputCodecInformation, ProgressInformation } from './utils/data-types'
import { Readable, Writable } from 'node:stream'
&nbsp;
export type RunResult = {
  stderr: string
  stdout: string
}
&nbsp;
export type RunOptions = {
  nice?: number
  cwd?: string
  timeout?: number
  onProgress?: (progress: ProgressInformation) =&gt; void
  onCodecData?: (data: InputCodecInformation) =&gt; void
  onStderr?: (line: string) =&gt; void
}
&nbsp;
export type ProcessOptions = RunOptions &amp; {
  args: string[]
  captureStdout?: boolean
  inputStream?: Readable
  outputStream?: Writable
}
&nbsp;
export class FfmpegProcess implements ProcessOptions {
  args: string[]
  nice?: number
  cwd?: string
  timeout?: number
  captureStdout?: boolean
  inputStream?: Readable
  outputStream?: Writable
  onProgress?: (progress: ProgressInformation) =&gt; void
  onCodecData?: (data: InputCodecInformation) =&gt; void
  onStderr?: (line: string) =&gt; void
&nbsp;
  constructor(options: ProcessOptions) {
    this.args = options.args
    this.nice = options.nice
    this.cwd = options.cwd
    this.timeout = options.timeout
    this.captureStdout = options.captureStdout
    this.inputStream = options.inputStream
    this.outputStream = options.outputStream
    this.onProgress = options.onProgress
    this.onCodecData = options.onCodecData
    this.onStderr = options.onStderr
&nbsp;
    this.#validateOptions()
  }
&nbsp;
  #validateOptions() {
    if (this.outputStream<span class="branch-0 cbranch-no" title="branch not covered" > &amp;&amp; this.captureStdout)</span> <span class="branch-0 cbranch-no" title="branch not covered" >{</span>
<span class="cstat-no" title="statement not covered" >      throw new Error(</span>
<span class="cstat-no" title="statement not covered" >        "Cannot use 'captureStdout' when a stream output is present"</span>
<span class="cstat-no" title="statement not covered" >      )</span>
<span class="cstat-no" title="statement not covered" >    }</span>
  }
&nbsp;
  // TODO return a compound type that is PromiseLike and has methods on the process (like kill)
  run(callback?: (err: any, result?: any) =&gt; any): Promise&lt;RunResult&gt; {
    let cmd = process.env.FFMPEG_PATH || 'ffmpeg'
    let args: string[] = [...this.args]
&nbsp;
    let { onProgress, onCodecData, onStderr } = this
&nbsp;
    if (this.nice &amp;&amp; this.nice !== 0 &amp;&amp; !isWindows) {
      args = ['-n', this.nice.toString(), cmd, ...args]
      cmd = 'nice'
    }
&nbsp;
    let promise: Promise&lt;RunResult&gt; = new Promise((resolve, reject) =&gt; {
      let child = spawn(cmd, args, {
        cwd: this.cwd,
        timeout: this.timeout,
        windowsHide: true
      })
&nbsp;
      let stderr = new LineBuffer()
      let stdout = new LineBuffer()
&nbsp;
      if (onStderr) {
        stderr.on('line', onStderr)
      }
&nbsp;
      if (onProgress) {
        stderr.on('line', (line: string) =&gt; {
          let progress = extractProgress(line)
          if (progress) {
            onProgress?.(progress)
          }
        })
      }
&nbsp;
      if (onCodecData) {
        let extractor = new CodecDataExtractor(onCodecData)
        stderr.on('line', (line: string) =&gt; {
          if (!extractor.done) {
            extractor.processLine(line)
          }
        })
      }
&nbsp;
      child.on('error', (err) =&gt; reject(err))
&nbsp;
      child.on('close', (code, signal) =&gt; {
        stderr.close()
        stdout.close()
&nbsp;
        if (signal) {
          reject(new Error(`ffmpeg was killed with signal ${signal}`))
        } else if (code) {
          let message = `ffmpeg exited with code ${code}`
          let error = extractErrorMessage(stderr.lines)
&nbsp;
          if (error) {
            message = `${message}:\n${error}`
          }
&nbsp;
          reject(new Error(message))
        } else {
          resolve({
            stdout: stdout.toString(),
            stderr: stderr.toString()
          })
        }
      })
&nbsp;
      if (this.inputStream) <span class="branch-0 cbranch-no" title="branch not covered" >{</span>
<span class="cstat-no" title="statement not covered" >        this.inputStream.pipe(child.stdin)</span>
<span class="cstat-no" title="statement not covered" >        this.inputStream.on('error', (err) =&gt; {</span>
<span class="cstat-no" title="statement not covered" >          // TODO make a specific error type</span>
<span class="cstat-no" title="statement not covered" >          reject(err)</span>
<span class="cstat-no" title="statement not covered" ></span>
<span class="cstat-no" title="statement not covered" >          child.kill()</span>
<span class="cstat-no" title="statement not covered" >        })</span>
<span class="cstat-no" title="statement not covered" ></span>
<span class="cstat-no" title="statement not covered" >        // Prevent stdin errors from bubbling up, ffmpeg will crash anyway</span>
<span class="cstat-no" title="statement not covered" >        child.stdin.on('error', () =&gt; {})</span>
<span class="cstat-no" title="statement not covered" >      }</span>
&nbsp;
      child.stderr.on('data', (data) =&gt; stderr.append(data.toString()))
&nbsp;
      if (this.outputStream) <span class="branch-0 cbranch-no" title="branch not covered" >{</span>
<span class="cstat-no" title="statement not covered" >        child.stdout.pipe(this.outputStream)</span>
<span class="cstat-no" title="statement not covered" ></span>
<span class="cstat-no" title="statement not covered" >        this.outputStream.on('error', (err) =&gt; {</span>
<span class="cstat-no" title="statement not covered" >          // TODO make a specific error type</span>
<span class="cstat-no" title="statement not covered" >          reject(err)</span>
<span class="cstat-no" title="statement not covered" ></span>
<span class="cstat-no" title="statement not covered" >          child.kill()</span>
<span class="cstat-no" title="statement not covered" >        })</span>
      } else if (this.captureStdout) {
        child.stdout.on('data', (data) =&gt; stdout.append(data.toString()))
      }
    })
&nbsp;
    if (callback) {
      promise.then(
        (value) =&gt; callback(null, value),
        (reason) =&gt; callback(reason)
      )
    }
&nbsp;
    return promise
  }
}
&nbsp;</pre></td></tr></table></pre>

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