Parse Label elements for adaptation sets

Issue: #6297
PiperOrigin-RevId: 273297284

RELEASENOTES.md

@@ -24,8 +24,11 @@
 * Remove the `DataSpec.FLAG_ALLOW_ICY_METADATA` flag. Instead, set the header
   `IcyHeaders.REQUEST_HEADER_ENABLE_METADATA_NAME` in the `DataSpec`
   `httpRequestHeaders`.
-* DASH: Support negative @r values in segment timelines
+* DASH:
-  ([#1787](https://github.com/google/ExoPlayer/issues/1787)).
+  * Support negative @r values in segment timelines
+    ([#1787](https://github.com/google/ExoPlayer/issues/1787)).
+  * Support `Label` elements
+    ([#6297](https://github.com/google/ExoPlayer/issues/6297)).
 * Add `allowedCapturePolicy` field to `AudioAttributes` wrapper to allow to
   opt-out of audio recording.
 * Add `DataSpec.httpRequestHeaders` to set HTTP request headers when connecting

library/core/src/main/java/com/google/android/exoplayer2/Format.java

@@ -1099,6 +1099,39 @@ public final class Format implements Parcelable {
         exoMediaCryptoType);
   }
 
+  public Format copyWithLabel(@Nullable String label) {
+    return new Format(
+        id,
+        label,
+        selectionFlags,
+        roleFlags,
+        bitrate,
+        codecs,
+        metadata,
+        containerMimeType,
+        sampleMimeType,
+        maxInputSize,
+        initializationData,
+        drmInitData,
+        subsampleOffsetUs,
+        width,
+        height,
+        frameRate,
+        rotationDegrees,
+        pixelWidthHeightRatio,
+        projectionData,
+        stereoMode,
+        colorInfo,
+        channelCount,
+        sampleRate,
+        pcmEncoding,
+        encoderDelay,
+        encoderPadding,
+        language,
+        accessibilityChannel,
+        exoMediaCryptoType);
+  }
+
   public Format copyWithContainerInfo(
       @Nullable String id,
       @Nullable String label,

library/dash/src/main/java/com/google/android/exoplayer2/source/dash/manifest/DashManifestParser.java

@@ -316,7 +316,6 @@ public class DashManifestParser extends DefaultHandler
             parseRepresentation(
                 xpp,
                 baseUrl,
-                label,
                 mimeType,
                 codecs,
                 width,
@@ -343,6 +342,8 @@ public class DashManifestParser extends DefaultHandler
                 xpp, (SegmentTemplate) segmentBase, supplementalProperties, periodDurationMs);
       } else if (XmlPullParserUtil.isStartTag(xpp, "InbandEventStream")) {
         inbandEventStreams.add(parseDescriptor(xpp, "InbandEventStream"));
+      } else if (XmlPullParserUtil.isStartTag(xpp, "Label")) {
+        label = parseLabel(xpp);
       } else if (XmlPullParserUtil.isStartTag(xpp)) {
         parseAdaptationSetChild(xpp);
       }
@@ -353,7 +354,11 @@ public class DashManifestParser extends DefaultHandler
     for (int i = 0; i < representationInfos.size(); i++) {
       representations.add(
           buildRepresentation(
-              representationInfos.get(i), drmSchemeType, drmSchemeDatas, inbandEventStreams));
+              representationInfos.get(i),
+              label,
+              drmSchemeType,
+              drmSchemeDatas,
+              inbandEventStreams));
     }
 
     return buildAdaptationSet(id, contentType, representations, accessibilityDescriptors,
@@ -482,7 +487,6 @@ public class DashManifestParser extends DefaultHandler
   protected RepresentationInfo parseRepresentation(
       XmlPullParser xpp,
       String baseUrl,
-      @Nullable String label,
       @Nullable String adaptationSetMimeType,
       @Nullable String adaptationSetCodecs,
       int adaptationSetWidth,
@@ -553,7 +557,6 @@ public class DashManifestParser extends DefaultHandler
     Format format =
         buildFormat(
             id,
-            label,
             mimeType,
             width,
             height,
@@ -574,7 +577,6 @@ public class DashManifestParser extends DefaultHandler
 
   protected Format buildFormat(
       @Nullable String id,
-      @Nullable String label,
       @Nullable String containerMimeType,
       int width,
       int height,
@@ -598,7 +600,7 @@ public class DashManifestParser extends DefaultHandler
       if (MimeTypes.isVideo(sampleMimeType)) {
         return Format.createVideoContainerFormat(
             id,
-            label,
+            /* label= */ null,
             containerMimeType,
             sampleMimeType,
             codecs,
@@ -613,7 +615,7 @@ public class DashManifestParser extends DefaultHandler
       } else if (MimeTypes.isAudio(sampleMimeType)) {
         return Format.createAudioContainerFormat(
             id,
-            label,
+            /* label= */ null,
             containerMimeType,
             sampleMimeType,
             codecs,
@@ -636,7 +638,7 @@ public class DashManifestParser extends DefaultHandler
         }
         return Format.createTextContainerFormat(
             id,
-            label,
+            /* label= */ null,
             containerMimeType,
             sampleMimeType,
             codecs,
@@ -649,7 +651,7 @@ public class DashManifestParser extends DefaultHandler
     }
     return Format.createContainerFormat(
         id,
-        label,
+        /* label= */ null,
         containerMimeType,
         sampleMimeType,
         codecs,
@@ -661,10 +663,14 @@ public class DashManifestParser extends DefaultHandler
 
   protected Representation buildRepresentation(
       RepresentationInfo representationInfo,
+      @Nullable String label,
       @Nullable String extraDrmSchemeType,
       ArrayList<SchemeData> extraDrmSchemeDatas,
       ArrayList<Descriptor> extraInbandEventStreams) {
     Format format = representationInfo.format;
+    if (label != null) {
+      format = format.copyWithLabel(label);
+    }
     String drmSchemeType = representationInfo.drmSchemeType != null
         ? representationInfo.drmSchemeType : extraDrmSchemeType;
     ArrayList<SchemeData> drmSchemeDatas = representationInfo.drmSchemeDatas;
@@ -1132,6 +1138,32 @@ public class DashManifestParser extends DefaultHandler
     return new ProgramInformation(title, source, copyright, moreInformationURL, lang);
   }
 
+  /**
+   * Parses a Label element.
+   *
+   * @param xpp The parser from which to read.
+   * @throws XmlPullParserException If an error occurs parsing the element.
+   * @throws IOException If an error occurs reading the element.
+   * @return The parsed label.
+   */
+  protected String parseLabel(XmlPullParser xpp) throws XmlPullParserException, IOException {
+    return parseText(xpp, "Label");
+  }
+
+  /**
+   * Parses a BaseURL element.
+   *
+   * @param xpp The parser from which to read.
+   * @param parentBaseUrl A base URL for resolving the parsed URL.
+   * @throws XmlPullParserException If an error occurs parsing the element.
+   * @throws IOException If an error occurs reading the element.
+   * @return The parsed and resolved URL.
+   */
+  protected String parseBaseUrl(XmlPullParser xpp, String parentBaseUrl)
+      throws XmlPullParserException, IOException {
+    return UriUtil.resolve(parentBaseUrl, parseText(xpp, "BaseURL"));
+  }
+
   // AudioChannelConfiguration parsing.
 
   protected int parseAudioChannelConfiguration(XmlPullParser xpp)
@@ -1487,10 +1519,18 @@ public class DashManifestParser extends DefaultHandler
     }
   }
 
-  protected static String parseBaseUrl(XmlPullParser xpp, String parentBaseUrl)
+  protected static String parseText(XmlPullParser xpp, String label)
       throws XmlPullParserException, IOException {
-    xpp.next();
+    String text = "";
-    return UriUtil.resolve(parentBaseUrl, xpp.getText());
+    do {
+      xpp.next();
+      if (xpp.getEventType() == XmlPullParser.TEXT) {
+        text = xpp.getText();
+      } else {
+        maybeSkipTag(xpp);
+      }
+    } while (!XmlPullParserUtil.isEndTag(xpp, label));
+    return text;
   }
 
   protected static int parseInt(XmlPullParser xpp, String name, int defaultValue) {

library/dash/src/test/assets/sample_mpd_labels

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<MPD type="static" duration="1s" mediaPresentationDuration="PT1S">
+ <Period>
+  <SegmentTemplate startNumber="0" timescale="1000" media="sq/$Number$">
+   <SegmentTimeline>
+    <S d="1000"/>
+   </SegmentTimeline>
+  </SegmentTemplate>
+  <AdaptationSet id="0" mimeType="audio/mp4" subsegmentAlignment="true" label="audio label">
+   <Representation id="0" codecs="mp4a.40.2" audioSamplingRate="48000" bandwidth="144000">
+    <BaseURL>https://test.com/0</BaseURL>
+   </Representation>
+  </AdaptationSet>
+  <AdaptationSet id="1" mimeType="video/mp4" subsegmentAlignment="true" label="ignored label">
+   <Representation id="1" codecs="avc1.4d4015" width="426" height="240" bandwidth="258000">
+    <BaseURL>https://test.com/1</BaseURL>
+   </Representation>
+   <Label>video label</Label>
+  </AdaptationSet>
+ </Period>
+</MPD>

library/dash/src/test/java/com/google/android/exoplayer2/source/dash/manifest/DashManifestParserTest.java

@@ -44,6 +44,7 @@ public class DashManifestParserTest {
   private static final String SAMPLE_MPD_UNKNOWN_MIME_TYPE = "sample_mpd_unknown_mime_type";
   private static final String SAMPLE_MPD_SEGMENT_TEMPLATE = "sample_mpd_segment_template";
   private static final String SAMPLE_MPD_EVENT_STREAM = "sample_mpd_event_stream";
+  private static final String SAMPLE_MPD_LABELS = "sample_mpd_labels";
 
   private static final String NEXT_TAG_NAME = "Next";
   private static final String NEXT_TAG = "<" + NEXT_TAG_NAME + "/>";
@@ -176,6 +177,21 @@ public class DashManifestParserTest {
     assertThat(mpd.programInformation).isEqualTo(expectedProgramInformation);
   }
 
+  @Test
+  public void parseMediaPresentationDescription_labels() throws IOException {
+    DashManifestParser parser = new DashManifestParser();
+    DashManifest manifest =
+        parser.parse(
+            Uri.parse("https://example.com/test.mpd"),
+            TestUtil.getInputStream(
+                ApplicationProvider.getApplicationContext(), SAMPLE_MPD_LABELS));
+
+    List<AdaptationSet> adaptationSets = manifest.getPeriod(0).adaptationSets;
+
+    assertThat(adaptationSets.get(0).representations.get(0).format.label).isEqualTo("audio label");
+    assertThat(adaptationSets.get(1).representations.get(0).format.label).isEqualTo("video label");
+  }
+
   @Test
   public void parseSegmentTimeline_repeatCount() throws Exception {
     DashManifestParser parser = new DashManifestParser();
@@ -251,6 +267,30 @@ public class DashManifestParserTest {
     assertNextTag(xpp);
   }
 
+  @Test
+  public void parseLabel() throws Exception {
+    DashManifestParser parser = new DashManifestParser();
+    XmlPullParser xpp = XmlPullParserFactory.newInstance().newPullParser();
+    xpp.setInput(new StringReader("<Label>test label</Label>" + NEXT_TAG));
+    xpp.next();
+
+    String label = parser.parseLabel(xpp);
+    assertThat(label).isEqualTo("test label");
+    assertNextTag(xpp);
+  }
+
+  @Test
+  public void parseLabel_noText() throws Exception {
+    DashManifestParser parser = new DashManifestParser();
+    XmlPullParser xpp = XmlPullParserFactory.newInstance().newPullParser();
+    xpp.setInput(new StringReader("<Label/>" + NEXT_TAG));
+    xpp.next();
+
+    String label = parser.parseLabel(xpp);
+    assertThat(label).isEqualTo("");
+    assertNextTag(xpp);
+  }
+
   @Test
   public void parseCea608AccessibilityChannel() {
     assertThat(