private async void StartRecording(Callback callback)
{
bool result = true;
string message = null;
string fileExtension = ".3gp";
int counter = 0;
string audioFileName = StorageUtility.UpdateFilename(audioDefaultFileName, counter) + fileExtension;
bool fileExists = await StorageUtility.IsFileExistAsync(audioFileName, localFolderName);
while (fileExists)
{
counter++;
audioFileName = StorageUtility.UpdateFilename(audioFileName, counter) + fileExtension;
fileExists = await StorageUtility.IsFileExistAsync(audioFileName, localFolderName);
}
string currentFilePath = StorageUtility.GetAppLocalPath() + "/" + localFolderName + "/" + audioFileName;
result = result && await StorageUtility.CreateEmptyFileInFolder(localFolderName, audioFileName);
result = result && _recorder.StartRecording(currentFilePath, out message);
callback?.Invoke(result, message, currentFilePath);
}