Add progress

Author: jeromewu

docs/api.md

@@ -24,6 +24,7 @@ createWorker is a factory function that creates a ffmpeg worker, a worker is bas
   - `workerPath` path for downloading worker script
   - `workerBlobURL` a boolean to define whether to use Blob URL for worker script, default: true
   - `logger` a function to log the progress, a quick example is `m => console.log(m)`
+  - `progress` a function to trace the progress, a quick example is `p => console.log(p)`
 
 
 **Examples:**

package-lock.json

@@ -38,7 +38,7 @@
   },
   "homepage": "https://github.com/ffmpegjs/ffmpeg.js#readme",
   "dependencies": {
-    "@ffmpeg/core": "^0.3.0",
+    "@ffmpeg/core": "^0.3.1",
     "is-url": "^1.2.4",
     "node-fetch": "^2.6.0",
     "regenerator-runtime": "^0.13.3",

package.json

@@ -1,3 +1,4 @@
 module.exports = {
   logger: () => {},
+  progress: () => {},
 };

src/constants/defaultOptions.js

@@ -1,6 +1,7 @@
 const createJob = require('./createJob');
 const { log } = require('./utils/log');
 const getId = require('./utils/getId');
+const extractProgress = require('./utils/extractProgress');
 const resolvePaths = require('./utils/resolvePaths');
 const {
   defaultOptions,
@@ -17,6 +18,7 @@ module.exports = (_options = {}) => {
   const id = getId('Worker', workerCounter);
   const {
     logger,
+    progress,
     ...options
   } = resolvePaths({
     ...defaultOptions,
@@ -131,6 +133,7 @@ module.exports = (_options = {}) => {
       rejects[action](data);
       throw Error(data);
     } else if (status === 'progress') {
+      extractProgress(data, progress);
       logger(data);
     }
   });

src/createWorker.js

@@ -0,0 +1,19 @@
+let duration = 0;
+
+const ts2sec = (ts) => {
+  const [h, m, s] = ts.split(':');
+  return (parseFloat(h) * 60 * 60) + (parseFloat(m) * 60) + parseFloat(s);
+};
+
+module.exports = ({ message }, progress) => {
+  if (message.startsWith('  Duration')) {
+    const ts = message.split(', ')[0].split(': ')[1];
+    duration = ts2sec(ts);
+  } else if (message.startsWith('frame')) {
+    const ts = message.split('time=')[1].split(' ')[0];
+    const t = ts2sec(ts);
+    progress({ ratio: t / duration });
+  } else if (message.startsWith('video:')) {
+    progress({ ratio: 1 });
+  }
+};