ladybird/Tests/LibWeb/Text/input/WebAudio/AudioBuffer-copyToChannel.html

<script src="../include.js"></script>
<script>
    test(() => {
        // Create an empty AudioBuffer
        let audioBuffer = new AudioBuffer({
            numberOfChannels: 2,
            length: 7,
            sampleRate: 8000,
        });

        // Fill channel 0 with 5
        let channel0Data = audioBuffer.getChannelData(0);
        for (let i = 0; i < channel0Data.length; i++) {
            channel0Data[i] = 5;
        }

        // Fill channel 1 with 2
        let channel1Data = audioBuffer.getChannelData(1);
        for (let i = 0; i < channel1Data.length; i++) {
            channel1Data[i] = 2;
        }

        // Copy to out of range channel
        try {
            let errorBuffer = new Float32Array(channel0Data.length);
            audioBuffer.copyToChannel(errorBuffer, 2);
        } catch (e) {
            println(`Error calling copyToChannel: ${e}`);
        }

        // Copy from a non-Float32Array
        try {
            let notFloatArray = new Uint8Array(channel0Data.length);
            audioBuffer.copyToChannel(notFloatArray, 1, 2);
        } catch (e) {
            println(`Error calling copyToChannel: ${e}`);
        }

        // Copy full buffer into channel 0
        let fullBuffer = new Float32Array(channel0Data.length);
        for (let i = 0; i < fullBuffer.length; i++) {
            fullBuffer[i] = 1;
        }
        println(channel0Data);
        audioBuffer.copyToChannel(fullBuffer, 0);
        println(audioBuffer.getChannelData(0));

        // Copy buffer with bigger size into channel 0
        let biggerBuffer = new Float32Array(channel0Data.length + 3);
        for (let i = 0; i < biggerBuffer.length; i++) {
            biggerBuffer[i] = 1;
        }
        println(channel0Data);
        audioBuffer.copyToChannel(biggerBuffer, 0);
        println(audioBuffer.getChannelData(0));

        // Copy buffer into channel 1 with offset
        let offsetBuffer = new Float32Array(channel1Data.length);
        for (let i = 0; i < offsetBuffer.length; i++) {
            offsetBuffer[i] = 3;
        }
        audioBuffer.copyToChannel(offsetBuffer, 1, 2);
        println(audioBuffer.getChannelData(1));

        // Copy buffer into channel 1 with offset bigger than channel size.
        audioBuffer.copyToChannel(offsetBuffer, 1, channel1Data.length + 1);
        println(audioBuffer.getChannelData(1));

        // Copy buffer into detached buffer (no crash)
        let detachedBuffer = new Float32Array(channel0Data.length);
        const transferred = detachedBuffer.buffer.transfer();
        audioBuffer.copyToChannel(detachedBuffer, 0);
        println("Done.");
    });
</script>