Add support for extracting channel subscriber count in StreamInfo.

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

@@ -45,6 +45,7 @@ import java.time.OffsetDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.*;
 
+import static org.schabi.newpipe.extractor.ListExtractor.ITEM_COUNT_UNKNOWN;
 import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.*;
 import static org.schabi.newpipe.extractor.utils.Utils.EMPTY_STRING;
 import static org.schabi.newpipe.extractor.utils.Utils.UTF_8;
@@ -437,6 +438,20 @@ public class YoutubeStreamExtractor extends StreamExtractor {
         return fixThumbnailUrl(url);
     }
 
+    @Override
+    public long getUploaderSubscriberCount() throws ParsingException {
+        final JsonObject videoOwnerRenderer = JsonUtils.getObject(videoSecondaryInfoRenderer, "owner.videoOwnerRenderer");
+        if (videoOwnerRenderer.has("subscriberCountText")) {
+            try {
+                return Utils.mixedNumberWordToLong(getTextFromObject(videoOwnerRenderer.getObject("subscriberCountText")));
+            } catch (final NumberFormatException e) {
+                throw new ParsingException("Could not get subscriber count", e);
+            }
+        } else {
+            return ITEM_COUNT_UNKNOWN;
+        }
+    }
+
     @Nonnull
     @Override
     public String getDashMpdUrl() throws ParsingException {

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

@@ -202,6 +202,17 @@ public abstract class StreamExtractor extends Extractor {
         return false;
     }
 
+    /**
+     * The subscriber count of the uploader.
+     * If the subscriber count is not implemented, or is unavailable, return <code>-1</code>.
+     *
+     * @return the subscriber count of the uploader or -1 if not available
+     * @throws ParsingException
+     */
+    public long getUploaderSubscriberCount() throws ParsingException {
+        return -1;
+    }
+
     /**
      * The url to the image file/profile picture/avatar of the creator/uploader of the stream.
      * If the url is not available you can return an empty String.

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

@@ -235,6 +235,11 @@ public class StreamInfo extends Info {
         } catch (Exception e) {
             streamInfo.addError(e);
         }
+        try {
+            streamInfo.setUploaderSubscriberCount(extractor.getUploaderSubscriberCount());
+        } catch (Exception e) {
+            streamInfo.addError(e);
+        }
 
         try {
             streamInfo.setSubChannelName(extractor.getSubChannelName());
@@ -367,6 +372,7 @@ public class StreamInfo extends Info {
     private String uploaderUrl = "";
     private String uploaderAvatarUrl = "";
     private boolean uploaderVerified = false;
+    private long uploaderSubscriberCount = -1;
 
     private String subChannelName = "";
     private String subChannelUrl = "";
@@ -540,6 +546,14 @@ public class StreamInfo extends Info {
         this.uploaderVerified = uploaderVerified;
     }
 
+    public long getUploaderSubscriberCount() {
+        return uploaderSubscriberCount;
+    }
+
+    public void setUploaderSubscriberCount(long uploaderSubscriberCount) {
+        this.uploaderSubscriberCount = uploaderSubscriberCount;
+    }
+
     public String getSubChannelName() {
         return subChannelName;
     }

extractor/src/test/java/org/schabi/newpipe/extractor/services/BaseStreamExtractorTest.java

@@ -5,6 +5,7 @@ public interface BaseStreamExtractorTest extends BaseExtractorTest {
     void testUploaderName() throws Exception;
     void testUploaderUrl() throws Exception;
     void testUploaderAvatarUrl() throws Exception;
+    void testSubscriberCount() throws Exception;
     void testSubChannelName() throws Exception;
     void testSubChannelUrl() throws Exception;
     void testSubChannelAvatarUrl() throws Exception;

extractor/src/test/java/org/schabi/newpipe/extractor/services/DefaultStreamExtractorTest.java

@@ -45,6 +45,7 @@ public abstract class DefaultStreamExtractorTest extends DefaultExtractorTest<St
     public abstract String expectedUploaderName();
     public abstract String expectedUploaderUrl();
     public boolean expectedUploaderVerified() { return false; }
+    public long expectedUploaderSubscriberCountAtLeast() { return -1; }
     public String expectedSubChannelName() { return ""; } // default: there is no subchannel
     public String expectedSubChannelUrl() { return ""; } // default: there is no subchannel
     public boolean expectedDescriptionIsEmpty() { return false; } // default: description is not empty
@@ -105,6 +106,12 @@ public abstract class DefaultStreamExtractorTest extends DefaultExtractorTest<St
         assertEquals(expectedUploaderVerified(), extractor().isUploaderVerified());
     }
 
+    @Test
+    @Override
+    public void testSubscriberCount() throws Exception {
+        assertGreaterOrEqual(expectedUploaderSubscriberCountAtLeast(), extractor().getUploaderSubscriberCount());
+    }
+
     @Test
     @Override
     public void testSubChannelName() throws Exception {

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/stream/YoutubeStreamExtractorDefaultTest.java

@@ -138,6 +138,7 @@ public class YoutubeStreamExtractorDefaultTest {
         @Override public StreamType expectedStreamType() { return StreamType.VIDEO_STREAM; }
         @Override public String expectedUploaderName() { return "PewDiePie"; }
         @Override public String expectedUploaderUrl() { return "https://www.youtube.com/channel/UC-lHJZR3Gqxm24_Vd_AJ5Yw"; }
+        @Override public long expectedUploaderSubscriberCountAtLeast() { return 110_000_000; }
         @Override public List<String> expectedDescriptionContains() {
             return Arrays.asList("https://www.youtube.com/channel/UC7l23W7gFi4Uho6WSzckZRA",
                     "https://www.handcraftpictures.com/");
@@ -182,6 +183,7 @@ public class YoutubeStreamExtractorDefaultTest {
         @Override public StreamType expectedStreamType() { return StreamType.VIDEO_STREAM; }
         @Override public String expectedUploaderName() { return "Unbox Therapy"; }
         @Override public String expectedUploaderUrl() { return "https://www.youtube.com/channel/UCsTcErHg8oDvUnTzoqsYeNw"; }
+        @Override public long expectedUploaderSubscriberCountAtLeast() { return 18_000_000; }
         @Override public List<String> expectedDescriptionContains() {
             return Arrays.asList("https://www.youtube.com/watch?v=X7FLCHVXpsA&list=PL7u4lWXQ3wfI_7PgX0C-VTiwLeu0S4v34",
                     "https://www.youtube.com/watch?v=Lqv6G0pDNnw&list=PL7u4lWXQ3wfI_7PgX0C-VTiwLeu0S4v34",
@@ -274,6 +276,7 @@ public class YoutubeStreamExtractorDefaultTest {
         @Override public StreamType expectedStreamType() { return StreamType.VIDEO_STREAM; }
         @Override public String expectedUploaderName() { return "tagesschau"; }
         @Override public String expectedUploaderUrl() { return "https://www.youtube.com/channel/UC5NOEUbkLheQcaaRldYW5GA"; }
+        @Override public long expectedUploaderSubscriberCountAtLeast() { return 1_000_000; }
         @Override public boolean expectedUploaderVerified() { return true; }
         @Override public List<String> expectedDescriptionContains() {
             return Arrays.asList("Themen der Sendung", "07:15", "Wetter", "Sendung nachträglich bearbeitet");
@@ -336,6 +339,7 @@ public class YoutubeStreamExtractorDefaultTest {
         @Override public StreamType expectedStreamType() { return StreamType.VIDEO_STREAM; }
         @Override public String expectedUploaderName() { return "maiLab"; }
         @Override public String expectedUploaderUrl() { return "https://www.youtube.com/channel/UCyHDQ5C6z1NDmJ4g6SerW8g"; }
+        @Override public long expectedUploaderSubscriberCountAtLeast() { return 1_400_000; }
         @Override public List<String> expectedDescriptionContains()  {return Arrays.asList("Vitamin", "2:44", "Was ist Vitamin D?");}
         @Override public boolean expectedUploaderVerified() { return true; }
         @Override public long expectedLength() { return 1010; }
@@ -405,6 +409,7 @@ public class YoutubeStreamExtractorDefaultTest {
         @Override public StreamType expectedStreamType() { return StreamType.VIDEO_STREAM; }
         @Override public String expectedUploaderName() { return "Dinge Erklärt – Kurzgesagt"; }
         @Override public String expectedUploaderUrl() { return "https://www.youtube.com/channel/UCwRH985XgMYXQ6NxXDo8npw"; }
+        @Override public long expectedUploaderSubscriberCountAtLeast() { return 1_500_000; }
         @Override public List<String> expectedDescriptionContains() { return Arrays.asList("Lasst uns abtauchen!", "Angebot von funk", "Dinge"); }
         @Override public long expectedLength() { return 631; }
         @Override public long expectedTimestamp() { return TIMESTAMP; }