Bandcamp: extract stream length

Author: fynngodau

extractor/src/main/java/org/schabi/newpipe/extractor/services/bandcamp/extractors/BandcampStreamExtractor.java

@@ -161,6 +161,12 @@ public List<AudioStream> getAudioStreams() {
         return audioStreams;
     }
 
+    @Override
+    public long getLength() throws ParsingException {
+        return (long) albumJson.getArray("trackinfo").getObject(0)
+                .getDouble("duration");
+    }
+
     @Override
     public List<VideoStream> getVideoStreams() {
         return Collections.emptyList();

extractor/src/test/java/org/schabi/newpipe/extractor/services/bandcamp/BandcampStreamExtractorTest.java

@@ -91,7 +91,7 @@ public List<String> expectedDescriptionContains() {
 
     @Override
     public long expectedLength() {
-        return 0;
+        return 124;
     }
 
     @Override