feat: add track selection to downloader

app/build.gradle

@@ -191,7 +191,7 @@ dependencies {
     // name and the commit hash with the commit hash of the (pushed) commit you want to test
     // This works thanks to JitPack: https://jitpack.io/
     implementation 'com.github.TeamNewPipe:nanojson:1d9e1aea9049fc9f85e68b43ba39fe7be1c1f751'
-    implementation 'com.github.Theta-Dev:NewPipeExtractor:3fb356a7065c75909ee3856a29be92317c295bb9'
+    implementation 'com.github.Theta-Dev:NewPipeExtractor:1aa232475e957ce5d2c036406a983db4190ebf2b'
     implementation 'com.github.TeamNewPipe:NoNonsense-FilePicker:5.0.0'
 
 /** Checkstyle **/

app/src/main/java/org/schabi/newpipe/download/DownloadDialog.java

@@ -68,6 +68,8 @@ import org.schabi.newpipe.util.SecondaryStreamHelper;
 import org.schabi.newpipe.util.SimpleOnSeekBarChangeListener;
 import org.schabi.newpipe.util.StreamItemAdapter;
 import org.schabi.newpipe.util.StreamItemAdapter.StreamSizeWrapper;
+import org.schabi.newpipe.util.AudioTrackAdapter;
+import org.schabi.newpipe.util.AudioTrackAdapter.AudioTracksWrapper;
 import org.schabi.newpipe.util.ThemeHelper;
 
 import java.io.File;
@@ -95,12 +97,14 @@ public class DownloadDialog extends DialogFragment
     @State
     StreamInfo currentInfo;
     @State
-    StreamSizeWrapper<AudioStream> wrappedAudioStreams;
-    @State
     StreamSizeWrapper<VideoStream> wrappedVideoStreams;
     @State
     StreamSizeWrapper<SubtitlesStream> wrappedSubtitleStreams;
     @State
+    AudioTracksWrapper wrappedAudioTracks;
+    @State
+    int selectedAudioStreamIndex;
+    @State
     int selectedVideoIndex; // set in the constructor
     @State
     int selectedAudioIndex = 0; // default to the first item
@@ -117,6 +121,7 @@ public class DownloadDialog extends DialogFragment
     private Context context;
     private boolean askForSavePath;
 
+    private AudioTrackAdapter audioTrackAdapter;
     private StreamItemAdapter<AudioStream, Stream> audioStreamsAdapter;
     private StreamItemAdapter<VideoStream, AudioStream> videoStreamsAdapter;
     private StreamItemAdapter<SubtitlesStream, Stream> subtitleStreamsAdapter;
@@ -163,18 +168,26 @@ public class DownloadDialog extends DialogFragment
     public DownloadDialog(@NonNull final Context context, @NonNull final StreamInfo info) {
         this.currentInfo = info;
 
+        final List<AudioStream> audioStreams =
+                getStreamsOfSpecifiedDelivery(info.getAudioStreams(), PROGRESSIVE_HTTP);
+        final List<List<AudioStream>> groupedAudioStreams =
+                ListHelper.getGroupedAudioStreams(context, audioStreams);
+        this.wrappedAudioTracks = new AudioTracksWrapper(groupedAudioStreams, context);
+        this.selectedAudioStreamIndex =
+                ListHelper.getDefaultAudioTrackGroup(context, groupedAudioStreams);
+
         // TODO: Adapt this code when the downloader support other types of stream deliveries
         final List<VideoStream> videoStreams = ListHelper.getSortedStreamVideosList(
                 context,
                 getStreamsOfSpecifiedDelivery(info.getVideoStreams(), PROGRESSIVE_HTTP),
                 getStreamsOfSpecifiedDelivery(info.getVideoOnlyStreams(), PROGRESSIVE_HTTP),
                 false,
-                false
+                // If there are multiple languages available, prefer streams without audio
+                // to allow language selection
+                wrappedAudioTracks.size() > 1
         );
 
         this.wrappedVideoStreams = new StreamSizeWrapper<>(videoStreams, context);
-        this.wrappedAudioStreams = new StreamSizeWrapper<>(
-                getStreamsOfSpecifiedDelivery(info.getAudioStreams(), PROGRESSIVE_HTTP), context);
         this.wrappedSubtitleStreams = new StreamSizeWrapper<>(
                 getStreamsOfSpecifiedDelivery(info.getSubtitles(), PROGRESSIVE_HTTP), context);
 
@@ -212,33 +225,9 @@ public class DownloadDialog extends DialogFragment
         setStyle(STYLE_NO_TITLE, ThemeHelper.getDialogTheme(context));
         Icepick.restoreInstanceState(this, savedInstanceState);
 
-        final var secondaryStreams = new SparseArrayCompat<SecondaryStreamHelper<AudioStream>>(4);
+        this.audioTrackAdapter = new AudioTrackAdapter(wrappedAudioTracks);
-        final List<VideoStream> videoStreams = wrappedVideoStreams.getStreamsList();
-
-        for (int i = 0; i < videoStreams.size(); i++) {
-            if (!videoStreams.get(i).isVideoOnly()) {
-                continue;
-            }
-            final AudioStream audioStream = SecondaryStreamHelper
-                    .getAudioStreamFor(wrappedAudioStreams.getStreamsList(), videoStreams.get(i));
-
-            if (audioStream != null) {
-                secondaryStreams.append(i, new SecondaryStreamHelper<>(wrappedAudioStreams,
-                        audioStream));
-            } else if (DEBUG) {
-                final MediaFormat mediaFormat = videoStreams.get(i).getFormat();
-                if (mediaFormat != null) {
-                    Log.w(TAG, "No audio stream candidates for video format "
-                            + mediaFormat.name());
-                } else {
-                    Log.w(TAG, "No audio stream candidates for unknown video format");
-                }
-            }
-        }
-
-        this.videoStreamsAdapter = new StreamItemAdapter<>(wrappedVideoStreams, secondaryStreams);
-        this.audioStreamsAdapter = new StreamItemAdapter<>(wrappedAudioStreams);
         this.subtitleStreamsAdapter = new StreamItemAdapter<>(wrappedSubtitleStreams);
+        updateSecondaryStreams();
 
         final Intent intent = new Intent(context, DownloadManagerService.class);
         context.startService(intent);
@@ -265,6 +254,38 @@ public class DownloadDialog extends DialogFragment
         }, Context.BIND_AUTO_CREATE);
     }
 
+    /**
+     * Update the displayed video streams based on the selected audio track.
+     */
+    private void updateSecondaryStreams() {
+        final StreamSizeWrapper<AudioStream> audioStreams = getWrappedAudioStreams();
+        final var secondaryStreams = new SparseArrayCompat<SecondaryStreamHelper<AudioStream>>(4);
+        final List<VideoStream> videoStreams = wrappedVideoStreams.getStreamsList();
+
+        for (int i = 0; i < videoStreams.size(); i++) {
+            if (!videoStreams.get(i).isVideoOnly()) {
+                continue;
+            }
+            final AudioStream audioStream = SecondaryStreamHelper
+                    .getAudioStreamFor(audioStreams.getStreamsList(), videoStreams.get(i));
+
+            if (audioStream != null) {
+                secondaryStreams.append(i, new SecondaryStreamHelper<>(audioStreams, audioStream));
+            } else if (DEBUG) {
+                final MediaFormat mediaFormat = videoStreams.get(i).getFormat();
+                if (mediaFormat != null) {
+                    Log.w(TAG, "No audio stream candidates for video format "
+                            + mediaFormat.name());
+                } else {
+                    Log.w(TAG, "No audio stream candidates for unknown video format");
+                }
+            }
+        }
+
+        this.videoStreamsAdapter = new StreamItemAdapter<>(wrappedVideoStreams, secondaryStreams);
+        this.audioStreamsAdapter = new StreamItemAdapter<>(audioStreams);
+    }
+
     @Override
     public View onCreateView(@NonNull final LayoutInflater inflater,
                              final ViewGroup container,
@@ -285,13 +306,13 @@ public class DownloadDialog extends DialogFragment
 
         dialogBinding.fileName.setText(FilenameUtils.createFilename(getContext(),
                 currentInfo.getName()));
-        selectedAudioIndex = ListHelper
+        selectedAudioIndex = ListHelper.getDefaultAudioFormat(getContext(),
-                .getDefaultAudioFormat(getContext(), wrappedAudioStreams.getStreamsList());
+                getWrappedAudioStreams().getStreamsList());
 
         selectedSubtitleIndex = getSubtitleIndexBy(subtitleStreamsAdapter.getAll());
 
         dialogBinding.qualitySpinner.setOnItemSelectedListener(this);
-
+        dialogBinding.audioTrackSpinner.setOnItemSelectedListener(this);
         dialogBinding.videoAudioGroup.setOnCheckedChangeListener(this);
 
         initToolbar(dialogBinding.toolbarLayout.toolbar);
@@ -383,7 +404,7 @@ public class DownloadDialog extends DialogFragment
                         new ErrorInfo(throwable, UserAction.DOWNLOAD_OPEN_DIALOG,
                                 "Downloading video stream size",
                                 currentInfo.getServiceId()))));
-        disposables.add(StreamSizeWrapper.fetchSizeForWrapper(wrappedAudioStreams)
+        disposables.add(StreamSizeWrapper.fetchSizeForWrapper(getWrappedAudioStreams())
                 .subscribe(result -> {
                     if (dialogBinding.videoAudioGroup.getCheckedRadioButtonId()
                             == R.id.audio_button) {
@@ -405,14 +426,29 @@ public class DownloadDialog extends DialogFragment
                                 currentInfo.getServiceId()))));
     }
 
+    private void setupAudioTrackSpinner() {
+        if (getContext() == null) {
+            return;
+        }
+
+        dialogBinding.audioTrackSpinner.setAdapter(audioTrackAdapter);
+        dialogBinding.audioTrackSpinner.setSelection(selectedAudioStreamIndex);
+
+        dialogBinding.audioStreamSpinner.setAdapter(audioStreamsAdapter);
+        dialogBinding.audioStreamSpinner.setSelection(selectedAudioIndex);
+    }
+
     private void setupAudioSpinner() {
         if (getContext() == null) {
             return;
         }
 
-        dialogBinding.qualitySpinner.setAdapter(audioStreamsAdapter);
+        dialogBinding.qualitySpinner.setVisibility(View.GONE);
-        dialogBinding.qualitySpinner.setSelection(selectedAudioIndex);
         setRadioButtonsState(true);
+        dialogBinding.audioStreamSpinner.setVisibility(View.VISIBLE);
+        dialogBinding.audioTrackSpinner.setVisibility(
+                wrappedAudioTracks.size() > 1 ? View.VISIBLE : View.GONE);
+        dialogBinding.defaultAudioTrackPresentText.setVisibility(View.GONE);
     }
 
     private void setupVideoSpinner() {
@@ -422,7 +458,21 @@ public class DownloadDialog extends DialogFragment
 
         dialogBinding.qualitySpinner.setAdapter(videoStreamsAdapter);
         dialogBinding.qualitySpinner.setSelection(selectedVideoIndex);
+        dialogBinding.qualitySpinner.setVisibility(View.VISIBLE);
         setRadioButtonsState(true);
+        dialogBinding.audioStreamSpinner.setVisibility(View.GONE);
+        onVideoStreamSelected();
+    }
+
+    private void onVideoStreamSelected() {
+        final boolean isVideoOnly = videoStreamsAdapter.getItem(selectedVideoIndex).isVideoOnly();
+
+        dialogBinding.audioTrackSpinner.setVisibility(
+                isVideoOnly && wrappedAudioTracks.size() > 1 ? View.VISIBLE : View.GONE);
+        dialogBinding.defaultAudioTrackPresentText.setVisibility(
+                !isVideoOnly && wrappedAudioTracks.size() > 1 ? View.VISIBLE : View.GONE
+
+        );
     }
 
     private void setupSubtitleSpinner() {
@@ -432,7 +482,11 @@ public class DownloadDialog extends DialogFragment
 
         dialogBinding.qualitySpinner.setAdapter(subtitleStreamsAdapter);
         dialogBinding.qualitySpinner.setSelection(selectedSubtitleIndex);
+        dialogBinding.qualitySpinner.setVisibility(View.VISIBLE);
         setRadioButtonsState(true);
+        dialogBinding.audioStreamSpinner.setVisibility(View.GONE);
+        dialogBinding.audioTrackSpinner.setVisibility(View.GONE);
+        dialogBinding.defaultAudioTrackPresentText.setVisibility(View.GONE);
     }
 
 
@@ -550,18 +604,27 @@ public class DownloadDialog extends DialogFragment
                     + "parent = [" + parent + "], view = [" + view + "], "
                     + "position = [" + position + "], id = [" + id + "]");
         }
-        switch (dialogBinding.videoAudioGroup.getCheckedRadioButtonId()) {
+
-            case R.id.audio_button:
+        switch (parent.getId()) {
+            case R.id.quality_spinner:
+                switch (dialogBinding.videoAudioGroup.getCheckedRadioButtonId()) {
+                    case R.id.video_button:
+                        selectedVideoIndex = position;
+                        onVideoStreamSelected();
+                        break;
+                    case R.id.subtitle_button:
+                        selectedSubtitleIndex = position;
+                        break;
+                }
+                onItemSelectedSetFileName();
+                break;
+            case R.id.audio_track_spinner:
+                selectedAudioStreamIndex = position;
+                updateSecondaryStreams();
+                break;
+            case R.id.audio_stream_spinner:
                 selectedAudioIndex = position;
-                break;
-            case R.id.video_button:
-                selectedVideoIndex = position;
-                break;
-            case R.id.subtitle_button:
-                selectedSubtitleIndex = position;
-                break;
         }
-        onItemSelectedSetFileName();
     }
 
     private void onItemSelectedSetFileName() {
@@ -607,6 +670,7 @@ public class DownloadDialog extends DialogFragment
 
     protected void setupDownloadOptions() {
         setRadioButtonsState(false);
+        setupAudioTrackSpinner();
 
         final boolean isVideoStreamsAvailable = videoStreamsAdapter.getCount() > 0;
         final boolean isAudioStreamsAvailable = audioStreamsAdapter.getCount() > 0;
@@ -657,6 +721,13 @@ public class DownloadDialog extends DialogFragment
         dialogBinding.subtitleButton.setEnabled(enabled);
     }
 
+    private StreamSizeWrapper<AudioStream> getWrappedAudioStreams() {
+        if (selectedAudioStreamIndex < 0 || selectedAudioStreamIndex > wrappedAudioTracks.size()) {
+            return StreamSizeWrapper.empty();
+        }
+        return wrappedAudioTracks.getTracksList().get(selectedAudioStreamIndex);
+    }
+
     private int getSubtitleIndexBy(@NonNull final List<SubtitlesStream> streams) {
         final Localization preferredLocalization = NewPipe.getPreferredLocalization();
 
@@ -1013,7 +1084,6 @@ public class DownloadDialog extends DialogFragment
                         psName = Postprocessing.ALGORITHM_WEBM_MUXER;
                     }
 
-                    psArgs = null;
                     final long videoSize = wrappedVideoStreams.getSizeInBytes(
                             (VideoStream) selectedStream);
 

app/src/main/java/org/schabi/newpipe/util/AudioTrackAdapter.java

@@ -0,0 +1,94 @@
+package org.schabi.newpipe.util;
+
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.BaseAdapter;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import org.schabi.newpipe.R;
+import org.schabi.newpipe.extractor.stream.AudioStream;
+import org.schabi.newpipe.util.StreamItemAdapter.StreamSizeWrapper;
+
+import java.io.Serializable;
+import java.util.List;
+import java.util.stream.Collectors;
+
+/**
+ * A list adapter for groups of {@link AudioStream}s (audio tracks).
+ */
+public class AudioTrackAdapter extends BaseAdapter {
+    private final AudioTracksWrapper tracksWrapper;
+
+    public AudioTrackAdapter(final AudioTracksWrapper tracksWrapper) {
+        this.tracksWrapper = tracksWrapper;
+    }
+
+    @Override
+    public int getCount() {
+        return tracksWrapper.size();
+    }
+
+    @Override
+    public List<AudioStream> getItem(final int position) {
+        return tracksWrapper.getTracksList().get(position).getStreamsList();
+    }
+
+    @Override
+    public long getItemId(final int position) {
+        return position;
+    }
+
+    @Override
+    public View getView(final int position, final View convertView, final ViewGroup parent) {
+        final var context = parent.getContext();
+        final View view;
+        if (convertView == null) {
+            view = LayoutInflater.from(context).inflate(
+                    R.layout.stream_quality_item, parent, false);
+        } else {
+            view = convertView;
+        }
+
+        final ImageView woSoundIconView = view.findViewById(R.id.wo_sound_icon);
+        final TextView formatNameView = view.findViewById(R.id.stream_format_name);
+        final TextView qualityView = view.findViewById(R.id.stream_quality);
+        final TextView sizeView = view.findViewById(R.id.stream_size);
+
+        final List<AudioStream> streams = getItem(position);
+        final AudioStream stream = streams.get(0);
+
+        woSoundIconView.setVisibility(View.GONE);
+        sizeView.setVisibility(View.VISIBLE);
+
+        if (stream.getAudioTrackId() != null) {
+            formatNameView.setText(stream.getAudioTrackId());
+        }
+        qualityView.setText(Localization.audioTrackName(context, stream));
+
+        return view;
+    }
+
+    public static class AudioTracksWrapper implements Serializable {
+        private final List<StreamSizeWrapper<AudioStream>> tracksList;
+
+        public AudioTracksWrapper(@NonNull final List<List<AudioStream>> groupedAudioStreams,
+                                  @Nullable final Context context) {
+            this.tracksList = groupedAudioStreams.stream().map(streams ->
+                    new StreamSizeWrapper<>(streams, context)).collect(Collectors.toList());
+        }
+
+        public List<StreamSizeWrapper<AudioStream>> getTracksList() {
+            return tracksList;
+        }
+
+        public int size() {
+            return tracksList.size();
+        }
+    }
+}

app/src/main/java/org/schabi/newpipe/util/ListHelper.java

@@ -111,6 +111,19 @@ public final class ListHelper {
                 getAudioTrackComparator(context).thenComparing(getAudioFormatComparator(context)));
     }
 
+    public static int getDefaultAudioTrackGroup(final Context context,
+                                                final List<List<AudioStream>> groupedAudioStreams) {
+        if (groupedAudioStreams == null || groupedAudioStreams.isEmpty()) {
+            return -1;
+        }
+
+        final Comparator<AudioStream> cmp = getAudioTrackComparator(context);
+        final List<AudioStream> highestRanked = groupedAudioStreams.stream()
+                .max((o1, o2) -> cmp.compare(o1.get(0), o2.get(0)))
+                .orElse(null);
+        return groupedAudioStreams.indexOf(highestRanked);
+    }
+
     public static int getAudioFormatIndex(final Context context,
                                           final List<AudioStream> audioStreams,
                                           @Nullable final String trackId) {
@@ -240,8 +253,50 @@ public final class ListHelper {
         }
 
         // Sort collected streams by name
-        return collectedStreams.values().stream().sorted(Comparator.comparing(audioStream ->
+        return collectedStreams.values().stream().sorted(getAudioTrackNameComparator(context))
-                Localization.audioTrackName(context, audioStream))).collect(Collectors.toList());
+                .collect(Collectors.toList());
+    }
+
+    /**
+     * Group the list of audioStreams by their track ID and sort the resulting list by track name.
+     *
+     * @param context      app context to get track names for sorting
+     * @param audioStreams list of audio streams
+     * @return list of audio streams lists representing individual tracks
+     */
+    public static List<List<AudioStream>> getGroupedAudioStreams(
+            @NonNull final Context context,
+            @Nullable final List<AudioStream> audioStreams) {
+        if (audioStreams == null) {
+            return Collections.emptyList();
+        }
+
+        final HashMap<String, List<AudioStream>> collectedStreams = new HashMap<>();
+
+        for (final AudioStream stream : audioStreams) {
+            final String trackId = Objects.toString(stream.getAudioTrackId(), "");
+            if (collectedStreams.containsKey(trackId)) {
+                collectedStreams.get(trackId).add(stream);
+            } else {
+                final List<AudioStream> list = new ArrayList<>();
+                list.add(stream);
+                collectedStreams.put(trackId, list);
+            }
+        }
+
+        // Filter unknown audio tracks if there are multiple tracks
+        if (collectedStreams.size() > 1) {
+            collectedStreams.remove("");
+        }
+
+        // Sort tracks alphabetically, sort track streams by quality
+        final Comparator<AudioStream> nameCmp = getAudioTrackNameComparator(context);
+        final Comparator<AudioStream> formatCmp = getAudioFormatComparator(context);
+
+        return collectedStreams.values().stream()
+                .sorted((o1, o2) -> nameCmp.compare(o1.get(0), o2.get(0)))
+                .map(streams -> streams.stream().sorted(formatCmp).collect(Collectors.toList()))
+                .collect(Collectors.toList());
     }
 
     /*//////////////////////////////////////////////////////////////////////////
@@ -413,8 +468,8 @@ public final class ListHelper {
      * Get the audio-stream from the list with the highest rank, depending on the comparator.
      * Format will be ignored if it yields no results.
      *
-     * @param audioStreams   List of audio streams
+     * @param audioStreams List of audio streams
-     * @param comparator     The comparator used for determining the max/best/highest ranked value
+     * @param comparator   The comparator used for determining the max/best/highest ranked value
      * @return Index of audio stream that produces the highest ranked result or -1 if not found
      */
     static int getAudioIndexByHighestRank(@Nullable final List<AudioStream> audioStreams,
@@ -615,6 +670,9 @@ public final class ListHelper {
 
     /**
      * Get a {@link Comparator} to compare {@link AudioStream}s by their format and bitrate.
+     *
+     * <p>The prefered stream will be ordered last.</p>
+     *
      * @param context app context
      * @return Comparator
      */
@@ -628,7 +686,9 @@ public final class ListHelper {
     /**
      * Get a {@link Comparator} to compare {@link AudioStream}s by their format and bitrate.
      *
-     * @param defaultFormat the default format to look for
+     * <p>The prefered stream will be ordered last.</p>
+     *
+     * @param defaultFormat  the default format to look for
      * @param limitDataUsage choose low bitrate audio stream
      * @return Comparator
      */
@@ -655,6 +715,21 @@ public final class ListHelper {
     /**
      * Get a {@link Comparator} to compare {@link AudioStream}s by their tracks.
      *
+     * <p>In this order:</p>
+     * <ol>
+     * <li>If {@code preferOriginalAudio}: is original audio</li>
+     * <li>Language matches {@code preferredLanguage}</li>
+     * <li>
+     *     Track type ranks highest in this order:
+     *     <i>Original</i> > <i>Dubbed</i> > <i>Descriptive</i>
+     *     <p>If {@code preferDescriptiveAudio}:
+     *     <i>Descriptive</i> > <i>Dubbed</i> > <i>Original</i></p>
+     * </li>
+     * <li>Language is English</li>
+     * </ol>
+     *
+     * <p>The prefered track will be ordered last.</p>
+     *
      * @param context App context
      * @return Comparator
      */
@@ -677,8 +752,23 @@ public final class ListHelper {
     /**
      * Get a {@link Comparator} to compare {@link AudioStream}s by their tracks.
      *
-     * @param preferredLanguage Preferred audio stream language
+     * <p>In this order:</p>
-     * @param preferOriginalAudio Get the original audio track regardless of its language
+     * <ol>
+     * <li>If {@code preferOriginalAudio}: is original audio</li>
+     * <li>Language matches {@code preferredLanguage}</li>
+     * <li>
+     *     Track type ranks highest in this order:
+     *     <i>Original</i> > <i>Dubbed</i> > <i>Descriptive</i>
+     *     <p>If {@code preferDescriptiveAudio}:
+     *     <i>Descriptive</i> > <i>Dubbed</i> > <i>Original</i></p>
+     * </li>
+     * <li>Language is English</li>
+     * </ol>
+     *
+     * <p>The prefered track will be ordered last.</p>
+     *
+     * @param preferredLanguage      Preferred audio stream language
+     * @param preferOriginalAudio    Get the original audio track regardless of its language
      * @param preferDescriptiveAudio Prefer the descriptive audio track if available
      * @return Comparator
      */
@@ -699,10 +789,26 @@ public final class ListHelper {
                         Comparator.nullsFirst(Comparator.comparing(
                                 locale -> locale.getISO3Language().equals(langCode))))
                 .thenComparing(AudioStream::getAudioTrackType,
-                        Comparator.nullsLast(Comparator.comparingInt(trackTypeRanking::indexOf)))
+                        Comparator.nullsFirst(Comparator.comparingInt(trackTypeRanking::indexOf)))
                 .thenComparing(AudioStream::getAudioLocale,
                         Comparator.nullsFirst(Comparator.comparing(
                                 locale -> locale.getISO3Language().equals(
                                         Locale.ENGLISH.getISO3Language()))));
     }
+
+    /**
+     * Get a {@link Comparator} to compare {@link AudioStream}s by their languages and track types
+     * for alphabetical sorting.
+     *
+     * @param context app context for localization
+     * @return Comparator
+     */
+    private static Comparator<AudioStream> getAudioTrackNameComparator(
+            @NonNull final Context context) {
+        final Locale appLoc = Localization.getAppLocale(context);
+
+        return Comparator.comparing(AudioStream::getAudioLocale, Comparator.nullsLast(
+                        Comparator.comparing(locale -> locale.getDisplayName(appLoc))))
+                .thenComparing(AudioStream::getAudioTrackType);
+    }
 }

app/src/main/res/layout/download_dialog.xml

@@ -71,11 +71,45 @@
         android:minWidth="150dp"
         tools:listitem="@layout/stream_quality_item" />
 
+    <Spinner
+        android:id="@+id/audio_track_spinner"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/quality_spinner"
+        android:layout_marginLeft="20dp"
+        android:layout_marginRight="20dp"
+        android:layout_marginBottom="12dp"
+        android:minWidth="150dp"
+        tools:visibility="gone" />
+
+    <Spinner
+        android:id="@+id/audio_stream_spinner"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/audio_track_spinner"
+        android:layout_marginLeft="20dp"
+        android:layout_marginRight="20dp"
+        android:layout_marginBottom="12dp"
+        android:minWidth="150dp"
+        tools:visibility="gone" />
+
+    <org.schabi.newpipe.views.NewPipeTextView
+        android:id="@+id/default_audio_track_present_text"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_below="@+id/audio_stream_spinner"
+        android:layout_marginLeft="24dp"
+        android:layout_marginRight="24dp"
+        android:layout_marginBottom="12dp"
+        android:gravity="center"
+        android:text="@string/default_audio_track_present"
+        android:textSize="12sp" />
+
     <org.schabi.newpipe.views.NewPipeTextView
         android:id="@+id/threads_text_view"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_below="@+id/quality_spinner"
+        android:layout_below="@+id/default_audio_track_present_text"
         android:layout_marginLeft="24dp"
         android:layout_marginRight="24dp"
         android:layout_marginBottom="6dp"

app/src/main/res/values/strings.xml

@@ -764,6 +764,7 @@
     <string name="enumeration_comma">,</string>
     <string name="toggle_all">Toggle all</string>
     <string name="streams_not_yet_supported_removed">Streams which are not yet supported by the downloader are not shown</string>
+    <string name="default_audio_track_present">The default audio track should be already present in this stream</string>
     <string name="selected_stream_external_player_not_supported">The selected stream is not supported by external players</string>
     <string name="no_audio_streams_available_for_external_players">No audio streams are available for external players</string>
     <string name="no_video_streams_available_for_external_players">No video streams are available for external players</string>