-Added hls manifest url extraction.

-Changed manifest url fields to nonnull.

src/main/java/org/schabi/newpipe/extractor/services/soundcloud/SoundcloudStreamExtractor.java

@@ -116,9 +116,16 @@ public class SoundcloudStreamExtractor extends StreamExtractor {
         return SoundcloudParsingHelper.getAvatarUrl(track);
     }
 
+    @Nonnull
     @Override
     public String getDashMpdUrl() {
-        return null;
+        return "";
+    }
+
+    @Nonnull
+    @Override
+    public String getHlsUrl() throws ParsingException {
+        return "";
     }
 
     @Override

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

@@ -66,12 +66,6 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         }
     }
 
-    public class LiveStreamException extends ContentNotAvailableException {
-        LiveStreamException(String message) {
-            super(message);
-        }
-    }
-
     public class SubtitlesException extends ContentNotAvailableException {
         SubtitlesException(String message, Throwable cause) {
             super(message, cause);
@@ -338,6 +332,7 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         }
     }
 
+    @Nonnull
     @Override
     public String getDashMpdUrl() throws ParsingException {
         assertPageFetched();
@@ -365,6 +360,24 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         }
     }
 
+    @Nonnull
+    @Override
+    public String getHlsUrl() throws ParsingException {
+        assertPageFetched();
+        try {
+            String hlsvp;
+            if (playerArgs != null && playerArgs.isString("hlsvp")) {
+                hlsvp = playerArgs.getString("hlsvp", "");
+            } else {
+                return "";
+            }
+
+            return hlsvp;
+        } catch (Exception e) {
+            throw new ParsingException("Could not get hls manifest url", e);
+        }
+    }
+
     @Override
     public List<AudioStream> getAudioStreams() throws IOException, ExtractionException {
         assertPageFetched();

src/main/java/org/schabi/newpipe/extractor/stream/StreamExtractor.java

@@ -126,7 +126,8 @@ public abstract class StreamExtractor extends Extractor {
      * @return the url as a string or an empty string
      * @throws ParsingException if an error occurs while reading
      */
-    public abstract String getDashMpdUrl() throws ParsingException;
+    @Nonnull public abstract String getDashMpdUrl() throws ParsingException;
+    @Nonnull public abstract String getHlsUrl() throws ParsingException;
     public abstract List<AudioStream> getAudioStreams() throws IOException, ExtractionException;
     public abstract List<VideoStream> getVideoStreams() throws IOException, ExtractionException;
     public abstract List<VideoStream> getVideoOnlyStreams() throws IOException, ExtractionException;

src/main/java/org/schabi/newpipe/extractor/stream/StreamInfo.java

@@ -126,6 +126,10 @@ public class StreamInfo extends Info {
         return dashMpdUrl;
     }
 
+    public String getHlsUrl() {
+        return hlsUrl;
+    }
+
     public StreamInfoItem getNextVideo() {
         return next_video;
     }
@@ -206,6 +210,10 @@ public class StreamInfo extends Info {
         this.dashMpdUrl = dashMpdUrl;
     }
 
+    public void setHlsUrl(String hlsUrl) {
+        this.hlsUrl = hlsUrl;
+    }
+
     public void setNextVideo(StreamInfoItem next_video) {
         this.next_video = next_video;
     }
@@ -298,6 +306,12 @@ public class StreamInfo extends Info {
             streamInfo.addError(new ExtractionException("Couldn't get Dash manifest", e));
         }
 
+        try {
+            streamInfo.setHlsUrl(extractor.getHlsUrl());
+        } catch (Exception e) {
+            streamInfo.addError(new ExtractionException("Couldn't get HLS manifest", e));
+        }
+
         /*  Load and extract audio */
         try {
             streamInfo.setAudioStreams(extractor.getAudioStreams());
@@ -447,6 +461,7 @@ public class StreamInfo extends Info {
     // crawling such a file is not service dependent. Therefore getting audio only streams by yust
     // providing the dash mpd file will be possible in the future.
     public String dashMpdUrl;
+    public String hlsUrl;
 
     public StreamInfoItem next_video;
     public List<InfoItem> related_streams;