Init commit

.gitattributes

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+. !text !filter !merge !diff

.gitignore

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+node_modules

README.md

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+FFmpeg.js
+=========
+
+A FFmpeg WebAssembly version built from scratch, you can learn how to do it from this series of stories: [Build FFmpeg WebAssembly version (=ffmpeg.js)](https://medium.com/@jeromewus/build-ffmpeg-webassembly-version-ffmpeg-js-part-1-preparation-ed12bf4c8fac).
+
+---
+
+## Installation
+
+```
+$ npm install @ffmpeg/ffmpeg
+```
+
+## Example
+
+```javascript
+const fs = require('fs');
+const ffmpeg = require('@ffmpeg/ffmpeg');
+
+(async () => {
+  await ffmpeg.load();
+  const data = ffmpeg.transcode('./test.avi', 'mp4');
+  fs.wrieFileSync('./test.mp4', data);
+})();
+```

examples/transcode.js

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+const fs = require('fs');
+const ffmpeg = require('../src');
+const { argv } = process;
+const [,, inputPath, outputPath] = argv;
+
+(async () => {
+  await ffmpeg.load();
+  const data = ffmpeg.transcode(inputPath, outputPath.split('.').pop());
+  fs.writeFileSync(outputPath, data);
+})();

package-lock.json

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+{
+  "name": "@ffmpeg/ffmpeg",
+  "version": "0.1.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@ffmpeg/core": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/@ffmpeg/core/-/core-0.1.0.tgz",
+      "integrity": "sha512-a4/HokRytKFJDW+RVvuf22rUzjNgXZKhlF6FIVBcLACIDcCEQZ0uCUC+5DZb+xprCvdMyXm0wy90uoYLRTq+LA=="
+    }
+  }
+}

package.json

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+{
+  "name": "@ffmpeg/ffmpeg",
+  "version": "0.1.0",
+  "description": "FFmpeg WebAssembly version",
+  "main": "src/index.js",
+  "directories": {
+    "example": "examples"
+  },
+  "scripts": {
+    "test": "mocha"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/jeromewu/ffmpeg.js.git"
+  },
+  "keywords": [
+    "ffmpeg",
+    "WebAssembly",
+    "video"
+  ],
+  "author": "Jerome Wu <jeromewus@gmail.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/jeromewu/ffmpeg.js/issues"
+  },
+  "homepage": "https://github.com/jeromewu/ffmpeg.js#readme",
+  "dependencies": {
+    "@ffmpeg/core": "^0.1.0"
+  }
+}

src/constants/defaultArgs.js

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+module.exports = [
+  './ffmpeg',       // args[0] is always binary path
+  '-nostdin',       // Disable interaction mode
+  '-loglevel',
+  'quiet',
+];

src/index.js

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+const load = require('./load');
+const transcode = require('./transcode');
+
+module.exports = {
+  load,
+  transcode,
+};

src/load.js

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+const { setModule } = require('./util/module');
+const FFmpegCore = require('@ffmpeg/core');
+
+module.exports = () => (
+  new Promise((resolve, reject) => {
+    FFmpegCore()
+      .then((Module) => {
+        setModule(Module);
+        resolve();
+      });
+  })
+);

src/transcode.js

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+const fs = require('fs');
+const { getModule } = require('./util/module');
+const getFFmpeg = require('./util/getFFmpeg');
+const strList2ptr = require('./util/strList2ptr');
+const defaultArgs = require('./constants/defaultArgs');
+
+module.exports = (inputPath, outputExt, options='') => {
+  const Module = getModule();
+  const data = new Uint8Array(fs.readFileSync(inputPath));
+  const iPath = `file.${inputPath.split('.').pop()}`;
+  const oPath = `file.${outputExt}`;
+  const ffmpeg = getFFmpeg();
+  const args = [...defaultArgs, ...`${options} -i ${iPath} ${oPath}`.trim().split(' ')];
+  Module.FS.writeFile(iPath, data);
+  ffmpeg(args.length, strList2ptr(args));
+  return Buffer.from(Module.FS.readFile(oPath));
+};

src/util/getFFmpeg.js

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+const { getModule } = require('./module');
+
+module.exports = () => {
+  const Module = getModule();
+  return Module.cwrap('ffmpeg', 'number', ['number', 'number']);
+};

src/util/module.js

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+let Module = null;
+
+exports.setModule = m => {
+  Module = m;
+};
+
+exports.getModule = () => Module;

src/util/str2ptr.js

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+const { getModule } = require('./module');
+
+module.exports = (s) => {
+  const Module = getModule();
+  const ptr = Module._malloc((s.length+1)*Uint8Array.BYTES_PER_ELEMENT);
+  for (let i = 0; i < s.length; i++) {
+    Module.setValue(ptr+i, s.charCodeAt(i), 'i8');
+  }
+  Module.setValue(ptr+s.length, 0, 'i8');
+  return ptr;
+};

src/util/strList2ptr.js

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+const { getModule } = require('./module');
+const str2ptr = require('./str2ptr');
+
+module.exports = (strList) => {
+  const Module = getModule();
+  const listPtr = Module._malloc(strList.length*Uint32Array.BYTES_PER_ELEMENT);
+
+  strList.forEach((s, idx) => {
+    const strPtr = str2ptr(s);
+    Module.setValue(listPtr + (4*idx), strPtr, 'i32');
+  });
+
+  return listPtr;
+};