| // META: global=window,worker |
| |
| 'use strict'; |
| |
| // This test asserts that compressed data length is shorter than the original |
| // data length. If the input is extremely small, the compressed data may be |
| // larger than the original data. |
| |
| const LARGE_FILE = '/media/test-av-384k-44100Hz-1ch-320x240-30fps-10kfr.webm'; |
| |
| async function compressArrayBuffer(input, format) { |
| const cs = new CompressionStream(format); |
| const writer = cs.writable.getWriter(); |
| writer.write(input); |
| const closePromise = writer.close(); |
| const out = []; |
| const reader = cs.readable.getReader(); |
| let totalSize = 0; |
| while (true) { |
| const { value, done } = await reader.read(); |
| if (done) |
| break; |
| out.push(value); |
| totalSize += value.byteLength; |
| } |
| await closePromise; |
| const concatenated = new Uint8Array(totalSize); |
| let offset = 0; |
| for (const array of out) { |
| concatenated.set(array, offset); |
| offset += array.byteLength; |
| } |
| return concatenated; |
| } |
| |
| promise_test(async () => { |
| const response = await fetch(LARGE_FILE); |
| const buffer = await response.arrayBuffer(); |
| const bufferView = new Uint8Array(buffer); |
| const originalLength = bufferView.length; |
| const compressedData = await compressArrayBuffer(bufferView, 'deflate'); |
| const compressedLength = compressedData.length; |
| assert_less_than(compressedLength, originalLength, 'output should be smaller'); |
| }, 'the length of deflated data should be shorter than that of the original data'); |
| |
| promise_test(async () => { |
| const response = await fetch(LARGE_FILE); |
| const buffer = await response.arrayBuffer(); |
| const bufferView = new Uint8Array(buffer); |
| const originalLength = bufferView.length; |
| const compressedData = await compressArrayBuffer(bufferView, 'gzip'); |
| const compressedLength = compressedData.length; |
| assert_less_than(compressedLength, originalLength, 'output should be smaller'); |
| }, 'the length of gzipped data should be shorter than that of the original data'); |