[Webkit-unassigned] [Bug 257447] New: StereoPannerNode distorts left panned audio

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257447

            Bug ID: 257447
           Summary: StereoPannerNode distorts left panned audio
           Product: WebKit
           Version: Safari 16
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jayboyd at gmail.com
                CC: cdumez at apple.com

When I create a StereoPannerNode and pan it to anything less than 0, the audio is very distorted. This happens in both Chrome and Safari on my Mac running Ventura 13.2.1.

The problem is identical if I do new StereoPannerNode() or audioContext.createStereoPanner(), and is identical whether I use a mono or stereo version of the same audio sample. It is also identical wherever I place the stereo panner node in the audio chain. 

When I play the audio sample using the OS (right-click from finder and preview), changing the OS pan setting, there is no distortion. 

Here's a bit of code: 

function playSound(name, volume=1, pan=0, octave=0) {
    const buffer = loadedAudio[name]; 
    if (!buffer) {
        console.warn('sound buffer not loaded for '+name); 
        return; 
    }
    if (audioCtx.state === 'suspended') {
        return; 
    }
    const source = audioCtx.createBufferSource();
    const gainNode = audioCtx.createGain(); 
    // const panNode = new StereoPannerNode(audioCtx, {pan: pan}); 
    const panNode = audioCtx.createStereoPanner();
    source.buffer = buffer;
    const note = Math.floor(Math.random() * NOTES.length); 
    const pitch = Math.pow(2, octave) * NOTES[note];
    source.playbackRate.value = pitch; 
    panNode.pan.value = pan;
    gainNode.gain.value = volume; 
    source.connect(gainNode);
    gainNode.connect(panNode); 
    panNode.connect(audioCtx.destination); 
    source.start(0);
}

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