cache player js code

Author: XiangRongLin

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeThrottlingDecoder.java

@@ -16,13 +16,16 @@ public class YoutubeThrottlingDecoder {
 
     private static final String HTTPS = "https:";
     private static final String N_PARAM_REGEX = "[&?]n=([^&]+)";
+    private static String playerJsCode;
 
     private final String functionName;
     private final String function;
 
     public YoutubeThrottlingDecoder(String videoId, Localization localization) throws ParsingException {
-        String playerJsUrl = cleanPlayerJsUrl(extractPlayerJsUrl(videoId, localization));
-        String playerJsCode = downloadPlayerJsCode(localization, playerJsUrl);
+        if (playerJsCode == null) {
+            String playerJsUrl = cleanPlayerJsUrl(extractPlayerJsUrl(videoId, localization));
+            playerJsCode = downloadPlayerJsCode(localization, playerJsUrl);
+        }
 
         functionName = parseDecodeFunctionName(playerJsCode);
         function = parseDecodeFunction(playerJsCode, functionName);

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java

@@ -534,7 +534,6 @@ public List<VideoStream> getVideoStreams() throws ExtractionException {
                 String newNParam = throttlingDecoder.decodeNParam(oldNParam);
                 String newUrl = throttlingDecoder.replaceNParam(url, newNParam);
 
-                System.out.println("aaaaaa  " + url + " - " + oldNParam + " - " + newNParam);
                 final VideoStream videoStream = new VideoStream(newUrl, false, itag);
                 if (!Stream.containSimilarStream(videoStream, videoStreams)) {
                     videoStreams.add(videoStream);