mirror of
https://github.com/shaka-project/shaka-player.git
synced 2026-06-15 16:06:41 +03:00
Ivan
2c8cfd20f3
This PR reduces GC pressure during MPEG-TS segment parsing - it replaces nested PES packet arrays with a flat array plus a PES-start index, eliminating per-PES inner array allocations and avoiding spread-operator overhead when concatenating packets - reduces allocations, hence reduces GC pressure on low-end devices during long livestreams
94 lines
2.8 KiB
JavaScript
94 lines
2.8 KiB
JavaScript
/*! @license
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* Shaka Player
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* Copyright 2026 Google LLC
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* SPDX-License-Identifier: Apache-2.0
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*/
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describe('Uint8ArrayUtils', () => {
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const Uint8ArrayUtils = shaka.util.Uint8ArrayUtils;
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describe('concat', () => {
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it('concatenates two buffers', () => {
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const a = new Uint8Array([1, 2]);
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const b = new Uint8Array([3, 4]);
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expect(Uint8ArrayUtils.concat(a, b))
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.toEqual(new Uint8Array([1, 2, 3, 4]));
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});
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it('concatenates three buffers', () => {
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const a = new Uint8Array([1]);
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const b = new Uint8Array([2]);
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const c = new Uint8Array([3]);
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expect(Uint8ArrayUtils.concat(a, b, c))
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.toEqual(new Uint8Array([1, 2, 3]));
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});
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it('handles empty buffers', () => {
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const a = new Uint8Array([1, 2]);
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const b = new Uint8Array([]);
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const c = new Uint8Array([3]);
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expect(Uint8ArrayUtils.concat(a, b, c))
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.toEqual(new Uint8Array([1, 2, 3]));
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});
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it('returns empty array when called with no args', () => {
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expect(Uint8ArrayUtils.concat()).toEqual(new Uint8Array([]));
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});
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it('accepts ArrayBuffer inputs', () => {
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const a = shaka.util.BufferUtils.toArrayBuffer(new Uint8Array([1, 2]));
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const b = shaka.util.BufferUtils.toArrayBuffer(new Uint8Array([3, 4]));
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expect(Uint8ArrayUtils.concat(a, b))
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.toEqual(new Uint8Array([1, 2, 3, 4]));
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});
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});
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describe('concatRange', () => {
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it('concatenates the full array by default', () => {
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const arr = [new Uint8Array([1, 2]), new Uint8Array([3, 4])];
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expect(Uint8ArrayUtils.concatRange(arr))
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.toEqual(new Uint8Array([1, 2, 3, 4]));
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});
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it('concatenates a middle range', () => {
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const arr = [
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new Uint8Array([1, 2]),
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new Uint8Array([3, 4]),
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new Uint8Array([5, 6]),
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];
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expect(Uint8ArrayUtils.concatRange(arr, 1, 2))
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.toEqual(new Uint8Array([3, 4]));
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});
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it('concatenates from start with explicit end', () => {
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const arr = [
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new Uint8Array([1]),
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new Uint8Array([2]),
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new Uint8Array([3]),
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];
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expect(Uint8ArrayUtils.concatRange(arr, 0, 2))
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.toEqual(new Uint8Array([1, 2]));
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});
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it('concatenates from explicit start to end of array', () => {
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const arr = [
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new Uint8Array([1]),
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new Uint8Array([2]),
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new Uint8Array([3]),
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];
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expect(Uint8ArrayUtils.concatRange(arr, 1))
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.toEqual(new Uint8Array([2, 3]));
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});
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it('returns empty array for empty range', () => {
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const arr = [new Uint8Array([1, 2]), new Uint8Array([3, 4])];
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expect(Uint8ArrayUtils.concatRange(arr, 1, 1))
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.toEqual(new Uint8Array([]));
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});
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it('returns empty array for empty input', () => {
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expect(Uint8ArrayUtils.concatRange([])).toEqual(new Uint8Array([]));
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});
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});
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});
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