Implemented StreamResolvingStrategy

Not finished yet

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

@@ -38,6 +38,7 @@
 import org.schabi.newpipe.extractor.utils.Parser;
 
 import java.io.IOException;
+import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
@@ -256,6 +257,35 @@ public String getSubChannelAvatarUrl() throws ParsingException {
         return "";
     }
 
+    /**
+     * Defines how the current stream info should best be resolved.
+     *
+     * <p>
+     * Service mostly offer different methods for streaming data.
+     * However the order is not always clearly defined.
+     * E.g. resolving a livestream might be better using the HLS master playlist.
+     * </p>
+     *
+     * @return A list with the StreamResolutionMode order by priority (0 = highest priority)
+     */
+    @Nonnull
+    public List<StreamResolvingStrategy> getResolverStrategyPriority() {
+        if (isLive()) {
+            return Arrays.asList(
+                    StreamResolvingStrategy.HLS_MASTER_PLAYLIST_URL,
+                    StreamResolvingStrategy.DASH_MPD_URL,
+                    StreamResolvingStrategy.VIDEO_ONLY_AND_AUDIO_STREAMS,
+                    StreamResolvingStrategy.VIDEO_AUDIO_STREAMS
+            );
+        }
+        return Arrays.asList(
+                StreamResolvingStrategy.VIDEO_ONLY_AND_AUDIO_STREAMS,
+                StreamResolvingStrategy.VIDEO_AUDIO_STREAMS,
+                StreamResolvingStrategy.HLS_MASTER_PLAYLIST_URL,
+                StreamResolvingStrategy.DASH_MPD_URL
+        );
+    }
+
     /**
      * Get the dash mpd url.
      *

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

@@ -72,6 +72,7 @@ public class StreamInfo extends Info {
     private String subChannelUrl = "";
     private String subChannelAvatarUrl = "";
 
+    private List<StreamResolvingStrategy> streamResolvingStrategies = new ArrayList<>();
     private List<VideoAudioStream> videoStreams = new ArrayList<>();
     private List<AudioStream> audioStreams = new ArrayList<>();
     private List<VideoStream> videoOnlyStreams = new ArrayList<>();
@@ -275,6 +276,15 @@ public void setSubChannelAvatarUrl(final String subChannelAvatarUrl) {
         this.subChannelAvatarUrl = subChannelAvatarUrl;
     }
 
+    @Nonnull
+    public List<StreamResolvingStrategy> getStreamResolvingStrategies() {
+        return streamResolvingStrategies;
+    }
+
+    public void setStreamResolvingStrategies(@Nonnull final List<StreamResolvingStrategy> streamResolvingStrategies) {
+        this.streamResolvingStrategies = streamResolvingStrategies;
+    }
+
     @Nonnull
     public List<VideoAudioStream> getVideoStreams() {
         return videoStreams;
@@ -507,6 +517,8 @@ private static StreamInfo extractImportantData(@Nonnull final StreamExtractor ex
     private static void extractStreams(final StreamInfo streamInfo,
                                        final StreamExtractor extractor)
             throws ExtractionException {
+        streamInfo.setStreamResolvingStrategies(extractor.getResolverStrategyPriority());
+
         /* ---- Stream extraction goes here ---- */
         // At least one type of stream has to be available, otherwise an exception will be thrown
         // directly into the frontend.

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

@@ -0,0 +1,31 @@
+package org.schabi.newpipe.extractor.stream;
+
+/**
+ * Defines what strategy of the extractor is used for playback.
+ */
+public enum StreamResolvingStrategy {
+    /**
+     * Uses video streams (with no audio) and separate audio streams.
+     * @see StreamExtractor#getVideoOnlyStreams()
+     * @see StreamExtractor#getAudioStreams()
+     */
+    VIDEO_ONLY_AND_AUDIO_STREAMS,
+    /**
+     * Uses video streams that include audio data.
+     *
+     * @see StreamExtractor#getVideoStreams()
+     */
+    VIDEO_AUDIO_STREAMS,
+    /**
+     * Uses the HLS master playlist url.
+     *
+     * @see StreamExtractor#getHlsMasterPlaylistUrl()
+     */
+    HLS_MASTER_PLAYLIST_URL,
+    /**
+     * Uses the DASH MPD url.
+     *
+     * @see StreamExtractor#getDashMpdUrl()
+     */
+    DASH_MPD_URL
+}