getMediaInfo method

Future<Map<String, dynamic>> getMediaInfo(String path)

Utilizes platform methods (which may include a combination of HW and SW decoders) to analyze the media file at a given path.

This method will return a standard FlutterError if the decoding failed.

Valid media files will generate a dictionary with relevant fields set.

Images are decoded in Dart, while Audio & Video files are processed on the platform itself.

The returned map contains the following fields, depending on the content parsed.

Images	Videos	Audio
mimeType	mimeType	mimeType
width	width
height	height
	frameRate
	durationMs	durationMs
	numTracks
		bitrate

Implementation

Future<Map<String, dynamic>> getMediaInfo(String path) async {
  final RandomAccessFile file = File(path).openSync();
  final Uint8List headerBytes = file.readSync(defaultMagicNumbersMaxLength);
  final String? mimeType = lookupMimeType(path, headerBytes: headerBytes);

  if (mimeType?.startsWith('image') == true) {
    Completer<ui.Image> completer = Completer<ui.Image>();

    final stream = FileImage(File(path)).resolve(const ImageConfiguration());

    final ImageStreamListener listener =
        ImageStreamListener((ImageInfo image, __) {
      if (!completer.isCompleted) {
        completer.complete(image.image);
      }
    }, onError: ((exception, stackTrace) {
      if (!completer.isCompleted) {
        completer.completeError(exception, stackTrace);
      }
    }));

    stream.addListener(listener);

    final image = await completer.future.whenComplete(
      () => stream.removeListener(listener),
    );

    return {
      'width': image.width,
      'height': image.height,
      'mimeType': mimeType,
    };
  }

  return (await _methodChannel.invokeMapMethod<String, dynamic>(
    'getMediaInfo',
    path,
  ))!;
}