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| (Empty) | |
| 1 <!DOCTYPE html> |
| 2 <body><span>click me</span></body> |
| 3 <script> |
| 4 function synthesizeClick(callback) { |
| 5 document.onclick = callback; |
| 6 window.parent.postMessage({ msg: 'clickme' }, '*'); |
| 7 } |
| 8 |
| 9 // AudioContext will start as suspended when lacking a user gesture. |
| 10 var audioContext = new AudioContext(); |
| 11 window.parent.postMessage({ msg: 'initialState', value: audioContext.state }, |
| 12 '*'); |
| 13 |
| 14 // OfflineAudioContext has no user gesture requirement but is always suspended. |
| 15 var offlineAudioContext = new OfflineAudioContext(1, 512, 3000); |
| 16 window.parent.postMessage({ msg: 'initialOfflineState', |
| 17 value: offlineAudioContext.state }, '*'); |
| 18 |
| 19 // Calling 'resume()' will fail to start the AudioContext. |
| 20 audioContext.resume(); |
| 21 window.parent.postMessage({ msg: 'afterResume', value: audioContext.state }, |
| 22 '*'); |
| 23 |
| 24 // Calling 'start()' will fail to start the AudioContext associated. |
| 25 var oscillator = audioContext.createOscillator(); |
| 26 oscillator.type = 'square'; |
| 27 oscillator.frequency.value = 2000; |
| 28 oscillator.connect(audioContext.destination); |
| 29 oscillator.start(); |
| 30 window.parent.postMessage({ msg: 'afterOscillator', value: audioContext.state }, |
| 31 '*'); |
| 32 |
| 33 var otherAudioContext = new AudioContext(); |
| 34 |
| 35 synthesizeClick(_ => { |
| 36 // Calling 'resume()' from a click event will start the audio context. |
| 37 audioContext.resume(); |
| 38 window.parent.postMessage({ msg: 'stateAfterClick', |
| 39 value: audioContext.state }, '*'); |
| 40 |
| 41 window.parent.postMessage({ msg: 'stateOtherContextAfterClick', |
| 42 value: otherAudioContext.state }, '*'); |
| 43 |
| 44 synthesizeClick(_ => { |
| 45 var oscillator = otherAudioContext.createOscillator(); |
| 46 oscillator.type = 'square'; |
| 47 oscillator.frequency.value = 2000; |
| 48 oscillator.connect(otherAudioContext.destination); |
| 49 // Calling 'start()' from a click event will not start the audio context. |
| 50 oscillator.start(); |
| 51 |
| 52 window.parent.postMessage({ msg: 'stateOtherContextAfterSecondClick', |
| 53 value: otherAudioContext.state }, '*'); |
| 54 |
| 55 synthesizeClick(_ => { |
| 56 // Creating an AudioContext from a click event will start it. |
| 57 var lastAudioContext = new AudioContext(); |
| 58 window.parent.postMessage({ msg: 'stateCreatedAfterClick', |
| 59 value: lastAudioContext.state }, '*'); |
| 60 |
| 61 window.parent.postMessage({ msg: 'done' }, '*'); |
| 62 }); |
| 63 }); |
| 64 }); |
| 65 </script> |
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Chromium Code Reviews
Issue 2314903002:
Web Audio: when media playback requires a user gesture, apply rule to cross origin iframes. (Closed)
