`--use-file-for-fake-audio-capture` doesn't work on Chrome

[tomoyamachi]

Current behavior:

I use --use-file-for-fake-audio-capture for testing getUserMedia behaviour on Chrome. https://github.com/cypress-io/cypress/issues/4160

But cypress v3.5.0 and v3.6.0, --use-file-for-fake-audio-capture doesn't work it.

Desired behavior:

--use-file-for-fake-audio-capture works on Chrome.

Steps to reproduce: (app code and test code)

// plugins/index.js
module.exports = (on, config) => {
    on('before:browser:launch', (browser = {}, args) => {
        if (browser.name === 'chrome') {
            args.push('--use-fake-device-for-media-stream')
            args.push('--use-fake-ui-for-media-stream')
            args.push('--use-file-for-fake-audio-capture=cypress/fixtures/sample.wav')
        }
        return args
    })
}

and args output

[ '--test-type',
  '--ignore-certificate-errors',
  '--start-maximized',
  '--silent-debugger-extension-api',
  '--no-default-browser-check',
  '--no-first-run',
  '--noerrdialogs',
  '--enable-fixed-layout',
  '--disable-popup-blocking',
  '--disable-password-generation',
  '--disable-save-password-bubble',
  '--disable-single-click-autofill',
  '--disable-prompt-on-repos',
  '--disable-background-timer-throttling',
  '--disable-renderer-backgrounding',
  '--disable-renderer-throttling',
  '--disable-restore-session-state',
  '--disable-translate',
  '--disable-new-profile-management',
  '--disable-new-avatar-menu',
  '--allow-insecure-localhost',
  '--reduce-security-for-testing',
  '--enable-automation',
  '--disable-device-discovery-notifications',
  '--disable-infobars',
  '--autoplay-policy=no-user-gesture-required',
  '--disable-site-isolation-trials',
  '--metrics-recording-only',
  '--disable-prompt-on-repost',
  '--disable-hang-monitor',
  '--disable-sync',
  '--disable-web-resources',
  '--safebrowsing-disable-auto-update',
  '--safebrowsing-disable-download-protection',
  '--disable-client-side-phishing-detection',
  '--disable-component-update',
  '--disable-default-apps',
  '--use-fake-ui-for-media-stream',
  '--use-fake-device-for-media-stream',
  '--disable-ipc-flooding-protection',
  '--disable-backgrounding-occluded-window',
  '--disable-breakpad',
  '--password-store=basic',
  '--use-mock-keychain',
  '--proxy-server=http://localhost:65342',
  '--proxy-bypass-list=<-loopback>',
  '--remote-debugging-port=65349',
  '--use-file-for-fake-audio-capture=cypress/fixtures/sample.wav' ]

I tried to absolute wav file path, but it doesn't work too.

Versions

Cypress v3.5.0, 3.6.0 OS : macOS 10.15 Chrome 78.0.3904.87, 79.0.3945.16

following version worked fine Cypress v3.4.1 OS : macOS 10.15 Chrome 78.0.3904.87

[jennifer-shehane]

I see the arg reading in the Chrome args output as the same path you specified: --use-file-for-fake-audio-capture=cypress/fixtures/sample.wav

Can you detail what the actual issue is? Is the audio file eventually not playing within the web application? What is the error point?

[IhorPryyma]

I'm facing the same issue with MAC Chrome. Did you find a solution?

[AliakseiK]

Issue reproduced for me as well. --use-file-for-fake-audio-capture doesn't work for 79 version of chrome on Mac OS. Sample audio isn't playing. I verified it on 76 version and works fine. Issue isn't related cypress, it is related to Chrome.

[guest271314]

To output audio to speakers when using --use-fake-file-for-audio-capture flag try using AudioContext MediaStreamAudioSourceNode or HTML <audio> element

navigator.mediaDevices.getUserMedia({audio: true})
.then(stream => {
  const audio = new Audio();
  audio.autoplay = true;
  audio.srcObject = stream;
});

navigator.mediaDevices.getUserMedia({audio: true})
.then(mediaStream => {
  const ac = new AudioContext();
  const source = ac.createMediaStreamSource(mediaStream);
  source.connect(ac.destination);
});

Command line

chromium-browser --allow-file-access-from-files --autoplay-policy=no-user-gesture-required --use-fake-device-for-media-stream --use-fake-ui-for-media-stream --use-file-for-fake-audio-capture=$HOME/test.wav%noloop --user-data-dir=$HOME/test 'file:///home/user/testUseFileForFakeAudioCaptureChromium.html'

Tested at Chromium 80.0.3987.7 (32-bit) *nix (both file: protocol and launching Chromium point to "https://github.com" and running the code at console).

To test download attached .txt file, save as .html, adjust paths at above command.

testUseFileForFakeAudioCaptureChromium.txt

[tomoyamachi]

Sorry for the late reply. It looks fail to play audio. But there is no error logs.

BTW, I ran @guest271314's scripts on Mac, and I got error message. I put test.wav to a target path, but fail to read it.

$ /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --version

Google Chrome 79.0.3945.88

$ /Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome \
  --allow-file-access-from-files \
  --autoplay-policy=no-user-gesture-required \
  --use-fake-device-for-media-stream \
  --use-fake-ui-for-media-stream \
  --use-file-for-fake-audio-capture=$HOME/test/test.wav \
  --user-data-dir=$HOME/test/data \
  file://$HOME/test/testUseFileForFakeAudioCaptureChromium.html

[39131:86787:0104/000139.036863:ERROR:simple_sources.cc(30)] Failed to read /Users/xxxx/test/test.wav as input to the fake device.

[guest271314]

Can you upload the wav file that you are testing here or print the output of mediainfo test.wav or mkvmerge -J test.wav? The path to the file or URL to load should be a string.

[davidhennemann]

I think its an issue with chromium and not cypress. I created a bug report in their issue tracker.

https://bugs.chromium.org/p/chromium/issues/detail?id=1032604

[jennifer-shehane]

Since this issue hasn't had activity in a while, we'll close the issue until we can confirm this is still happening. Please comment if there is new information to provide concerning the original issue and we'd be happy to reopen.

[andreieftimie]

Did anyone manage to get this working (found some workaround)?

[loszer]

according to https://bugs.chromium.org/p/chromium/issues/detail?id=1032604#c37 plugin/index.js add chrome args "--no-sandbox" demo code:

on('before:browser:launch', (browser = {}, launchOptions = { args: [] }) => {
    if (browser.name === 'chrome') {
      // https://bugs.chromium.org/p/chromium/issues/detail?id=1032604#c37
      launchOptions.args.push('--no-sandbox')
      launchOptions.args.push('--allow-file-access-from-files')
      launchOptions.args.push('--use-fake-ui-for-media-stream')
      launchOptions.args.push('--use-fake-device-for-media-stream')
      // mp3 not work
      launchOptions.args.push('--use-file-for-fake-audio-capture=tests/fixtures/hello.wav')
    }
    return launchOptions
  })

[mattrussell-sonocent]

@loszer Adding --no-sandbox worked a treat for us, thanks for sharing the workaround.