async Task <string> GetTranslatedWEBVTT(string uri, string inputLanguage, string outputLanguage)
{
string translatedContent = string.Empty;
if (!string.IsNullOrEmpty(uri) && !string.IsNullOrEmpty(inputLanguage) && !string.IsNullOrEmpty(outputLanguage))
{
string content = await GetContent(uri);
if (!string.IsNullOrEmpty(content))
{
TextBoxLogWriteLine("Original Subtitles downloaded");
List <SubtitileItem> SubtitleList = ParseWEBVTT(content);
if (SubtitleList.Count > 0)
{
TextBoxLogWriteLine("Original Subtitles parsed");
translatedContent += "\xFEFF";
translatedContent += "WEBVTT\r\n\r\n";
SubtitileItem newItem = new SubtitileItem("", "", "");
bool bError = false;
foreach (SubtitileItem item in SubtitleList)
{
newItem.startTime = item.startTime;
newItem.endTime = item.endTime;
if (!string.IsNullOrEmpty(item.subtitle))
{
newItem.subtitle = await _ttc.Translate(item.subtitle, inputLanguage, outputLanguage);
if (!string.IsNullOrEmpty(newItem.subtitle))
{
translatedContent += newItem.ToString();
}
else
{
bError = true;
break;
}
}
}
if (bError == true)
{
TextBoxLogWriteLine("Error while translating subtitles at " + newItem.startTime);
}
else
{
TextBoxLogWriteLine("Translating subtitles done:" + translatedContent);
}
}
}
else
{
TextBoxLogWriteLine("Error while downloading subtitles: subtitle string empty");
}
}
return(translatedContent);
}
List <SubtitileItem> ParseWEBVTT(string content)
{
List <SubtitileItem> result = new List <SubtitileItem>();
// Remove the first WCHAR FEFF from the string
int n = 0;
while ((n < content.Length) && (content[n] != 'W'))
{
n++;
}
content = content.Substring(n);
if (!string.IsNullOrEmpty(content) && (result != null))
{
string separator = "\r\n\r\n";
string separator1 = "\r\n";
string separator2 = "-->";
string[] tabLineSeparator = { separator };
string[] tabItemSeparator = { separator1, separator2 };
string[] lines = content.Split(tabLineSeparator, StringSplitOptions.RemoveEmptyEntries);
if (lines.Count() > 0)
{
if (lines[0] == "WEBVTT")
{
for (int i = 1; i < lines.Count(); i++)
{
string[] items = lines[i].Split(tabItemSeparator, StringSplitOptions.RemoveEmptyEntries);
if (items.Count() == 3)
{
string startTime = ParseWEBVTTTime(items[0]);
string endTime = ParseWEBVTTTime(items[1]);
string subtitle = items[2].Trim();
if (!string.IsNullOrEmpty(startTime) &&
!string.IsNullOrEmpty(endTime) &&
!string.IsNullOrEmpty(subtitle))
{
SubtitileItem item = new SubtitileItem(startTime, endTime, subtitle);
if (item != null)
{
result.Add(item);
}
}
}
}
}
}
}
;
return(result);
}
