Rework Bandcamp comments (#613)

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

@@ -38,8 +38,8 @@ public class BandcampChannelExtractor extends ChannelExtractor {
     @Override
     public String getBannerUrl() throws ParsingException {
         /*
-         * Why does the mobile endpoint not contain the header?? Or at least not the same one?
-         * Anyway we're back to querying websites
+         * Mobile API does not return the header or not the correct header.
+         * Therefore, we need to query the website
          */
         try {
             final String html = getDownloader()
@@ -61,8 +61,7 @@ public class BandcampChannelExtractor extends ChannelExtractor {
     }
 
     /**
-     * bandcamp stopped providing RSS feeds when appending /feed to any URL
-     * because too few people used it.
+     * Bandcamp discontinued their RSS feeds because it hadn't been used enough.
      */
     @Override
     public String getFeedUrl() {
@@ -108,7 +107,7 @@ public class BandcampChannelExtractor extends ChannelExtractor {
         final JsonArray discography = channelInfo.getArray("discography");
 
         for (int i = 0; i < discography.size(); i++) {
-            // I define discograph as an item that can appear in a discography
+            // A discograph is as an item appears in a discography
             final JsonObject discograph = discography.getObject(i);
 
             if (!discograph.getString("item_type").equals("track")) continue;

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

@@ -71,10 +71,14 @@ public class BandcampExtractorHelper {
     }
 
     /**
+     * Generate image url from image ID.
+     * <p>
+     * The appendix "_10" was chosen because it provides images sized 1200x1200. Other integer
+     * values are possible as well (e.g. 0 is a very large resolution, possibly the original).
+     *
      * @param id    The image ID
-     * @param album Whether this is the cover of an album
-     * @return URL of image with this ID in size 10 which is 1200x1200 (we could also choose size 0
-     * but we don't want something as large as 3460x3460 here)
+     * @param album True if this is the cover of an album or track
+     * @return URL of image with this ID sized 1200x1200
      */
     public static String getImageUrl(final long id, final boolean album) {
         return "https://f4.bcbits.com/img/" + (album ? 'a' : "") + id + "_10.jpg";

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

@@ -24,8 +24,8 @@ public class BandcampRadioInfoItemExtractor implements StreamInfoItemExtractor {
     @Override
     public long getDuration() {
         /* Duration is only present in the more detailed information that has to be queried separately.
-         * Because the servers would probably not like over 300 queries every time someone opens the kiosk,
-         * we're just providing 0 here.
+         * Therefore, over 300 queries would be needed every time the kiosk is opened if we were to
+         * display the real value.
          */
         //return query(show.getInt("id")).getLong("audio_duration");
         return 0;

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

@@ -54,7 +54,10 @@ public class BandcampRadioStreamExtractor extends BandcampStreamExtractor {
     @Nonnull
     @Override
     public String getName() throws ParsingException {
-        return showInfo.getString("subtitle"); // "audio_title" is a boring title
+        /* Select "subtitle" and not "audio_title", as the latter would cause a lot of
+         * items to show the same title, e.g. "Bandcamp Weekly".
+         */
+        return showInfo.getString("subtitle");
     }
 
     @Nonnull

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

@@ -48,7 +48,6 @@ public class BandcampSearchExtractor extends SearchExtractor {
     }
 
     public InfoItemsPage<InfoItem> getPage(final Page page) throws IOException, ExtractionException {
-        // okay apparently this is where we DOWNLOAD the page and then COMMIT its ENTRIES to an INFOITEMPAGE
         final String html = getDownloader().get(page.getUrl()).responseBody();
 
         final InfoItemsSearchCollector collector = new InfoItemsSearchCollector(getServiceId());

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

@@ -291,7 +291,9 @@ public class BandcampStreamExtractor extends StreamExtractor {
 
         int license = current.getInt("license_type");
 
-        // Tests resulted in this mapping of ints to licence: https://cloud.disroot.org/s/ZTWBxbQ9fKRmRWJ/preview
+        /* Tests resulted in this mapping of ints to licence: https://cloud.disroot.org/s/ZTWBxbQ9fKRmRWJ/preview
+         * (screenshot from a Bandcamp artist's account)
+         */
 
         switch (license) {
             case 1:

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

@@ -8,8 +8,7 @@ import org.schabi.newpipe.extractor.stream.StreamType;
 import javax.annotation.Nullable;
 
 /**
- * Implements methods that return a constant value for better readability in
- * subclasses.
+ * Implements methods that return a constant value in subclasses for better readability.
  */
 public abstract class BandcampStreamInfoItemExtractor implements StreamInfoItemExtractor {
     private final String uploaderUrl;