flv-h265/src/utils/ab-equality.js

HTML5 FLV Player

function isAligned16(a) {
    return a.byteOffset % 2 === 0 && a.byteLength % 2 === 0;
}

function isAligned32(a) {
    return a.byteOffset % 4 === 0 && a.byteLength % 4 === 0;
}

function compareArray(a, b) {
    for (let i = 0; i < a.length; i++) {
        if (a[i] !== b[i]) {
            return false;
        }
    }
    return true;
}

function equal8(a, b) {
    return compareArray(a, b);
}

function equal16(a, b) {
    let a16 = new Uint16Array(a.buffer, a.byteOffset, a.byteLength / 2);
    let b16 = new Uint16Array(b.buffer, b.byteOffset, b.byteLength / 2);
    return compareArray(a16, b16);
}

function equal32(a, b) {
    let a32 = new Uint32Array(a.buffer, a.byteOffset, a.byteLength / 4);
    let b32 = new Uint32Array(b.buffer, b.byteOffset, b.byteLength / 4);
    return compareArray(a32, b32);
}

function buffersAreEqual(a, b) {
    if (a.byteLength !== b.byteLength) {
        return false;
    }

    if (isAligned32(a) && isAligned32(b)) {
        return equal32(a, b);
    }

    if (isAligned16(a) && isAligned16(b)) {
        return equal16(a, b);
    }

    return equal8(a, b);
}

export default buffersAreEqual;