snapImage method
抓图
Implementation
Future<int> snapImage(String filePath) async {
if (_snapCompleter != null) {
await _snapCompleter!.future;
}
_snapCompleter = Completer();
final code = await _mediaPlayer.snapImage(
msg: SurfaceMessage(playHandle: _playHandle, textureId: textureId),
filePath: filePath);
_snapCompleter!.complete();
return code;
}