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refactor(audio): rename and enhance audio speed change functionality with improved tests

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This commit is contained in:
AshAnand34
2025-07-08 12:05:40 -07:00
parent 881b707392
commit 321484c670
4 changed files with 162 additions and 125 deletions
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71
src/pages/tools/audio/change-speed/index.tsx
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@@ -7,9 +7,8 @@ import { InitialValuesType } from './types';
import ToolAudioInput from '@components/input/ToolAudioInput';
import ToolFileResult from '@components/result/ToolFileResult';
import TextFieldWithDesc from '@components/options/TextFieldWithDesc';
import { FFmpeg } from '@ffmpeg/ffmpeg';
import { fetchFile } from '@ffmpeg/util';
import RadioWithTextField from '@components/options/RadioWithTextField';
import { changeAudioSpeed } from './service';
const initialValues: InitialValuesType = {
newSpeed: 2,
@@ -30,81 +29,15 @@ export default function ChangeSpeed({
const [result, setResult] = useState<File | null>(null);
const [loading, setLoading] = useState(false);
// FFmpeg only supports a tempo between 0.5 and 2.0, so we chain filters
const computeAudioFilter = (speed: number): string => {
if (speed <= 2 && speed >= 0.5) {
return `atempo=${speed}`;
}
const filters: string[] = [];
let remainingSpeed = speed;
while (remainingSpeed > 2.0) {
filters.push('atempo=2.0');
remainingSpeed /= 2.0;
}
while (remainingSpeed < 0.5) {
filters.push('atempo=0.5');
remainingSpeed /= 0.5;
}
filters.push(`atempo=${remainingSpeed.toFixed(2)}`);
return filters.join(',');
};
const compute = async (
optionsValues: InitialValuesType,
input: File | null
) => {
if (!input) return;
const { newSpeed, outputFormat } = optionsValues;
let ffmpeg: FFmpeg | null = null;
let ffmpegLoaded = false;
setLoading(true);
try {
ffmpeg = new FFmpeg();
if (!ffmpegLoaded) {
await ffmpeg.load({
wasmURL:
'https://cdn.jsdelivr.net/npm/@ffmpeg/core@0.12.9/dist/esm/ffmpeg-core.wasm'
});
ffmpegLoaded = true;
}
const fileName = input.name;
const outputName = `output.${outputFormat}`;
await ffmpeg.writeFile(fileName, await fetchFile(input));
const audioFilter = computeAudioFilter(newSpeed);
let args = ['-i', fileName, '-filter:a', audioFilter];
if (outputFormat === 'mp3') {
args.push('-b:a', '192k', '-f', 'mp3', outputName);
} else if (outputFormat === 'aac') {
args.push('-c:a', 'aac', '-b:a', '192k', '-f', 'adts', outputName);
} else if (outputFormat === 'wav') {
args.push(
'-acodec',
'pcm_s16le',
'-ar',
'44100',
'-ac',
'2',
'-f',
'wav',
outputName
);
}
await ffmpeg.exec(args);
const data = await ffmpeg.readFile(outputName);
let mimeType = 'audio/mp3';
if (outputFormat === 'aac') mimeType = 'audio/aac';
if (outputFormat === 'wav') mimeType = 'audio/wav';
const blob = new Blob([data], { type: mimeType });
const newFile = new File(
[blob],
fileName.replace(/\.[^/.]+$/, `-${newSpeed}x.${outputFormat}`),
{ type: mimeType }
);
await ffmpeg.deleteFile(fileName);
await ffmpeg.deleteFile(outputName);
const newFile = await changeAudioSpeed(input, optionsValues);
setResult(newFile);
} catch (err) {
console.error(`Failed to process audio: ${err}`);
setResult(null);
} finally {
setLoading(false);