Penn Controller Audio Segment Playing

[olivia]

Hi, I just have a question regarding whether there is a feature of if it is possible to write a function which allows the user to play a segment of an audio (marked with a starting time and an end time) instead of playing the entire audio. We do not have the project set up yet but would like to ask if this is a feasible feature to add.

Thank you so much for your help!

[Jeremy]

Hi,

There is no built-in command in PennController for that, but it’s easily implementable using a Function element:

newTrial(
    newButton("Start").print().wait().remove()
    ,
    newAudio("sample", "https://freetestdata.com/wp-content/uploads/2021/09/Free_Test_Data_100KB_MP3.mp3")
    ,
    newFunction("playSegment", async ()=>{
        const a = getAudio("sample")._element.audio;
        a.pause();
        a.currentTime = 1.25; // start at 1.25s
        a.play();
        await new Promise(r=>(function checkAudio() {
            if (a.currentTime >= 2.30) { // end at 2.30s
                a.pause();
                r();
            }
            else setTimeout(checkAudio);
        })());
    })
    ,
    newButton("Play segment").callback( getFunction("playSegment").call() ).print()
    ,
    newButton().wait()
)

Jeremy

[Author]

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