ffprobe command was added. Missing definitions were added. Code reformat.

packages/ffmpeg/src/classes.ts

@@ -62,6 +62,7 @@ export class FFmpeg {
           case FFMessageType.MOUNT:
           case FFMessageType.UNMOUNT:
           case FFMessageType.EXEC:
+          case FFMessageType.FFPROBE:
           case FFMessageType.WRITE_FILE:
           case FFMessageType.READ_FILE:
           case FFMessageType.DELETE_FILE:
@@ -249,6 +250,42 @@ export class FFmpeg {
       signal
     ) as Promise<number>;
 
+  /**
+   * Execute ffprobe command.
+   *
+   * @example
+   * ```ts
+   * const ffmpeg = new FFmpeg();
+   * await ffmpeg.load();
+   * await ffmpeg.writeFile("video.avi", ...);
+   * // Getting duration of a video in seconds: ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 video.avi -o output.txt
+   * await ffmpeg.ffprobe(["-v", "error", "-show_entries", "format=duration", "-of", "default=noprint_wrappers=1:nokey=1", "video.avi", "-o", "output.txt"]);
+   * const data = ffmpeg.readFile("output.txt");
+   * ```
+   *
+   * @returns `0` if no error, `!= 0` if timeout (1) or error.
+   * @category FFmpeg
+   */
+  public ffprobe = (
+    /** ffprobe command line args */
+    args: string[],
+    /**
+     * milliseconds to wait before stopping the command execution.
+     *
+     * @defaultValue -1
+     */
+    timeout = -1,
+    { signal }: FFMessageOptions = {}
+  ): Promise<number> =>
+    this.#send(
+      {
+        type: FFMessageType.FFPROBE,
+        data: { args, timeout },
+      },
+      undefined,
+      signal
+    ) as Promise<number>;
+
   /**
    * Terminate all ongoing API calls and terminate web worker.
    * `FFmpeg.load()` must be called again before calling any other APIs.

packages/ffmpeg/src/const.ts

@@ -7,6 +7,7 @@ export const CORE_URL = `https://unpkg.com/@ffmpeg/core@${CORE_VERSION}/dist/umd
 export enum FFMessageType {
   LOAD = "LOAD",
   EXEC = "EXEC",
+  FFPROBE = "FFPROBE",
   WRITE_FILE = "WRITE_FILE",
   READ_FILE = "READ_FILE",
   DELETE_FILE = "DELETE_FILE",

packages/ffmpeg/src/worker.ts

@@ -100,6 +100,14 @@ const exec = ({ args, timeout = -1 }: FFMessageExecData): ExitCode => {
   return ret;
 };
 
+const ffprobe = ({ args, timeout = -1 }: FFMessageExecData): ExitCode => {
+  ffmpeg.setTimeout(timeout);
+  ffmpeg.ffprobe(...args);
+  const ret = ffmpeg.ret;
+  ffmpeg.reset();
+  return ret;
+};
+
 const writeFile = ({ path, data }: FFMessageWriteFileData): OK => {
   ffmpeg.FS.writeFile(path, data);
   return true;
@@ -170,6 +178,9 @@ self.onmessage = async ({
       case FFMessageType.EXEC:
         data = exec(_data as FFMessageExecData);
         break;
+      case FFMessageType.FFPROBE:
+        data = ffprobe(_data as FFMessageExecData);
+        break;
       case FFMessageType.WRITE_FILE:
         data = writeFile(_data as FFMessageWriteFileData);
         break;