Complete major refactor

src/config.js

@@ -0,0 +1,52 @@
+module.exports = {
+  defaultArgs: [
+    /* args[0] is always the binary path */
+    './ffmpeg',
+    /* Disable interaction mode */
+    '-nostdin',
+    /* Force to override output file */
+    '-y',
+    /* Not to output banner */
+    '-hide_banner',
+  ],
+  baseOptions: {
+    /* Flag to turn on/off log messages in console */
+    log: false,
+    /*
+     * Custom logger to get ffmpeg.wasm output messages.
+     * a sample logger looks like this:
+     *
+     * ```
+     * logger = ({ type, message }) => {
+     *   console.log(type, message);
+     * }
+     * ```
+     *
+     * type can be one of following:
+     *
+     * info: internal workflow debug messages
+     * fferr: ffmpeg native stderr output
+     * ffout: ffmpeg native stdout output
+     */
+    logger: () => {},
+    /*
+     * Progress handler to get current progress of ffmpeg command.
+     * a sample progress handler looks like this:
+     *
+     * ```
+     * progress = ({ ratio }) => {
+     *   console.log(ratio);
+     * }
+     * ```
+     *
+     * ratio is a float number between 0 to 1.
+     */
+    progress: () => {},
+    /*
+     * Path to find/download ffmpeg.wasm-core,
+     * this value should be overwriten by `defaultOptions` in
+     * each environment.
+     */
+    corePath: '',
+  },
+};