Fix uploader name when requesting next streams

src/main/java/org/schabi/newpipe/extractor/channel/ChannelInfo.java

@@ -34,12 +34,12 @@ import java.util.ArrayList;
 
 public class ChannelInfo extends ListInfo {
 
-    public static NextItemsResult getMoreItems(ServiceList serviceItem, String nextStreamsUrl) throws IOException, ExtractionException {
-        return getMoreItems(serviceItem.getService(), nextStreamsUrl);
+    public static NextItemsResult getMoreItems(ServiceList serviceItem, String url, String nextStreamsUrl) throws IOException, ExtractionException {
+        return getMoreItems(serviceItem.getService(), url, nextStreamsUrl);
     }
 
-    public static NextItemsResult getMoreItems(StreamingService service, String nextStreamsUrl) throws IOException, ExtractionException {
-        return service.getChannelExtractor(null, nextStreamsUrl).getNextStreams();
+    public static NextItemsResult getMoreItems(StreamingService service, String url, String nextStreamsUrl) throws IOException, ExtractionException {
+        return service.getChannelExtractor(url, nextStreamsUrl).getNextStreams();
     }
 
     public static ChannelInfo getInfo(String url) throws IOException, ExtractionException {

src/main/java/org/schabi/newpipe/extractor/playlist/PlaylistInfo.java

@@ -14,12 +14,12 @@ import java.util.ArrayList;
 
 public class PlaylistInfo extends ListInfo {
 
-    public static NextItemsResult getMoreItems(ServiceList serviceItem, String nextStreamsUrl) throws IOException, ExtractionException {
-        return getMoreItems(serviceItem.getService(), nextStreamsUrl);
+    public static NextItemsResult getMoreItems(ServiceList serviceItem, String url, String nextStreamsUrl) throws IOException, ExtractionException {
+        return getMoreItems(serviceItem.getService(), url, nextStreamsUrl);
     }
 
-    public static NextItemsResult getMoreItems(StreamingService service, String nextStreamsUrl) throws IOException, ExtractionException {
-        return service.getPlaylistExtractor(null, nextStreamsUrl).getNextStreams();
+    public static NextItemsResult getMoreItems(StreamingService service, String url, String nextStreamsUrl) throws IOException, ExtractionException {
+        return service.getPlaylistExtractor(url, nextStreamsUrl).getNextStreams();
     }
 
     public static PlaylistInfo getInfo(String url) throws IOException, ExtractionException {

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

@@ -45,8 +45,6 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
     private static final String CHANNEL_FEED_BASE = "https://www.youtube.com/feeds/videos.xml?channel_id=";
     private static final String CHANNEL_URL_PARAMETERS = "/videos?view=0&flow=list&sort=dd&live_view=10000";
 
-    private String channelName = ""; //Small hack used to make the channelName available to NextStreams
-
     private Document doc;
     /**
      * It's lazily initialized (when getNextStreams is called)
@@ -69,6 +67,13 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
         nextStreamsAjax = null;
     }
 
+    @Override
+    protected boolean fetchPageUponCreation() {
+        // Unfortunately, we have to fetch the page even if we are getting only next streams,
+        // as they don't deliver enough information on their own (the channel name, for example).
+        return true;
+    }
+
     @Override
     public String getCleanUrl() {
         try {
@@ -93,8 +98,7 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
     @Override
     public String getName() throws ParsingException {
         try {
-            channelName = doc.select("span[class=\"qualified-channel-title-text\"]").first().select("a").first().text();
-            return channelName;
+            return doc.select("meta[property=\"og:title\"]").first().attr("content");
         } catch (Exception e) {
             throw new ParsingException("Could not get channel name", e);
         }
@@ -204,10 +208,10 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
         }
     }
 
-    private void collectStreamsFrom(StreamInfoItemCollector collector,
-                                    Element element) throws ParsingException {
+    private void collectStreamsFrom(StreamInfoItemCollector collector, Element element) throws ParsingException {
         collector.getItemList().clear();
 
+        final String uploaderName = getName();
         for (final Element li : element.children()) {
             if (li.select("div[class=\"feed-item-dismissable\"]").first() != null) {
                 collector.commit(new YoutubeStreamInfoItemExtractor(li) {
@@ -235,11 +239,7 @@ public class YoutubeChannelExtractor extends ChannelExtractor {
 
                     @Override
                     public String getUploaderName() throws ParsingException {
-                        if(channelName.isEmpty()) {
-                            return "";
-                        } else {
-                            return channelName;
-                        }
+                        return uploaderName;
                     }
 
                     @Override

src/test/java/org/schabi/newpipe/extractor/services/youtube/YoutubeChannelExtractorTest.java

@@ -6,7 +6,6 @@ import org.schabi.newpipe.Downloader;
 import org.schabi.newpipe.extractor.ListExtractor;
 import org.schabi.newpipe.extractor.NewPipe;
 import org.schabi.newpipe.extractor.channel.ChannelExtractor;
-import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 
 import static org.junit.Assert.*;
 import static org.schabi.newpipe.extractor.ServiceList.YouTube;