Handle malformed URL in RTP-Info header.

Some server will send partial URIs in the RTP-Info header, while the RTSP spec
requires absolute URLs.

Issue: #9346

#exofixit

PiperOrigin-RevId: 395452741

RELEASENOTES.md

@@ -78,6 +78,8 @@
 *   RTSP:
     *   Handle when additional spaces are in SDP's RTPMAP atrribute
         ([#9379](https://github.com/google/ExoPlayer/issues/9379)).
+    *   Handle partial URIs in RTP-Info headers
+        ([#9346](https://github.com/google/ExoPlayer/issues/9346)).
 *   Extractors:
     *   ID3: Fix issue decoding ID3 tags containing UTF-16 encoded strings
         ([#9087](https://github.com/google/ExoPlayer/issues/9087)).

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspClient.java

@@ -545,7 +545,7 @@ import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
             ImmutableList<RtspTrackTiming> trackTimingList =
                 rtpInfoString == null
                     ? ImmutableList.of()
-                    : RtspTrackTiming.parseTrackTiming(rtpInfoString);
+                    : RtspTrackTiming.parseTrackTiming(rtpInfoString, uri);
             onPlayResponseReceived(new RtspPlayResponse(response.status, timing, trackTimingList));
             break;
 

library/rtsp/src/main/java/com/google/android/exoplayer2/source/rtsp/RtspTrackTiming.java

@@ -15,10 +15,15 @@
  */
 package com.google.android.exoplayer2.source.rtsp;
 
+import static com.google.android.exoplayer2.util.Assertions.checkArgument;
+import static com.google.android.exoplayer2.util.Assertions.checkNotNull;
+
 import android.net.Uri;
 import androidx.annotation.Nullable;
+import androidx.annotation.VisibleForTesting;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.ParserException;
+import com.google.android.exoplayer2.util.UriUtil;
 import com.google.android.exoplayer2.util.Util;
 import com.google.common.collect.ImmutableList;
 
@@ -49,11 +54,12 @@ import com.google.common.collect.ImmutableList;
    * </pre>
    *
    * @param rtpInfoString The value of the RTP-Info header, with header name (RTP-Info) removed.
+   * @param sessionUri The session URI, must include an {@code rtsp} scheme.
    * @return A list of parsed {@link RtspTrackTiming}.
    * @throws ParserException If parsing failed.
    */
-  public static ImmutableList<RtspTrackTiming> parseTrackTiming(String rtpInfoString)
-      throws ParserException {
+  public static ImmutableList<RtspTrackTiming> parseTrackTiming(
+      String rtpInfoString, Uri sessionUri) throws ParserException {
 
     ImmutableList.Builder<RtspTrackTiming> listBuilder = new ImmutableList.Builder<>();
     for (String perTrackTimingString : Util.split(rtpInfoString, ",")) {
@@ -69,7 +75,7 @@ import com.google.common.collect.ImmutableList;
 
           switch (attributeName) {
             case "url":
-              uri = Uri.parse(attributeValue);
+              uri = resolveUri(/* urlString= */ attributeValue, sessionUri);
               break;
             case "seq":
               sequenceNumber = Integer.parseInt(attributeValue);
@@ -96,6 +102,48 @@ import com.google.common.collect.ImmutableList;
     return listBuilder.build();
   }
 
+  /**
+   * Resolves the input string to always be an absolute URL with RTP-Info headers
+   *
+   * <p>Handles some servers do not send absolute URL in RTP-Info headers. This method takes in
+   * RTP-Info header's url string, and returns the correctly formatted {@link Uri url} for this
+   * track. The input url string could be
+   *
+   * <ul>
+   *   <li>A correctly formatted URL, like "{@code rtsp://foo.bar/video}".
+   *   <li>A correct URI that is missing the scheme, like "{@code foo.bar/video}".
+   *   <li>A path to the resource, like "{@code video}" or "{@code /video}".
+   * </ul>
+   *
+   * @param urlString The URL included in the RTP-Info header, without the {@code url=} identifier.
+   * @param sessionUri The session URI, must include an {@code rtsp} scheme, or {@link
+   *     IllegalArgumentException} is thrown.
+   * @return The formatted URL.
+   */
+  @VisibleForTesting
+  /* package */ static Uri resolveUri(String urlString, Uri sessionUri) {
+    checkArgument(checkNotNull(sessionUri.getScheme()).equals("rtsp"));
+
+    Uri uri = Uri.parse(urlString);
+    if (uri.isAbsolute()) {
+      return uri;
+    }
+
+    // The urlString is at least missing the scheme.
+    uri = Uri.parse("rtsp://" + urlString);
+    String sessionUriString = sessionUri.toString();
+
+    String host = checkNotNull(uri.getHost());
+    if (host.equals(sessionUri.getHost())) {
+      // Handles the case that the urlString is only missing the scheme.
+      return uri;
+    }
+
+    return sessionUriString.endsWith("/")
+        ? UriUtil.resolveToUri(sessionUriString, urlString)
+        : UriUtil.resolveToUri(sessionUriString + "/", urlString);
+  }
+
   /**
    * The timestamp of the next RTP packet, {@link C#TIME_UNSET} if not present.
    *

library/rtsp/src/test/java/com/google/android/exoplayer2/source/rtsp/RtspTrackTimingTest.java

@@ -35,7 +35,7 @@ public class RtspTrackTimingTest {
         "url=rtsp://video.example.com/twister/video;seq=12312232;rtptime=78712811";
 
     ImmutableList<RtspTrackTiming> trackTimingList =
-        RtspTrackTiming.parseTrackTiming(rtpInfoString);
+        RtspTrackTiming.parseTrackTiming(rtpInfoString, Uri.parse("rtsp://video.example.com"));
 
     assertThat(trackTimingList).hasSize(1);
     RtspTrackTiming trackTiming = trackTimingList.get(0);
@@ -50,7 +50,7 @@ public class RtspTrackTimingTest {
         "url=rtsp://foo.com/bar.avi/streamid=0;seq=45102,url=rtsp://foo.com/bar.avi/streamid=1;seq=30211";
 
     ImmutableList<RtspTrackTiming> trackTimingList =
-        RtspTrackTiming.parseTrackTiming(rtpInfoString);
+        RtspTrackTiming.parseTrackTiming(rtpInfoString, Uri.parse("rtsp://foo.com"));
 
     assertThat(trackTimingList).hasSize(2);
     RtspTrackTiming trackTiming = trackTimingList.get(0);
@@ -67,27 +67,88 @@ public class RtspTrackTimingTest {
   public void parseTiming_withInvalidParameter_throws() {
     String rtpInfoString = "url=rtsp://video.example.com/twister/video;seq=123abc";
 
-    assertThrows(ParserException.class, () -> RtspTrackTiming.parseTrackTiming(rtpInfoString));
-  }
-
-  @Test
-  public void parseTiming_withInvalidUrl_throws() {
-    String rtpInfoString = "url=video.example.com/twister/video;seq=36192348";
-
-    assertThrows(ParserException.class, () -> RtspTrackTiming.parseTrackTiming(rtpInfoString));
+    assertThrows(
+        ParserException.class,
+        () ->
+            RtspTrackTiming.parseTrackTiming(
+                rtpInfoString, Uri.parse("rtsp://video.example.com/twister")));
   }
 
   @Test
   public void parseTiming_withNoParameter_throws() {
     String rtpInfoString = "url=rtsp://video.example.com/twister/video";
 
-    assertThrows(ParserException.class, () -> RtspTrackTiming.parseTrackTiming(rtpInfoString));
+    assertThrows(
+        ParserException.class,
+        () ->
+            RtspTrackTiming.parseTrackTiming(
+                rtpInfoString, Uri.parse("rtsp://video.example.com/twister")));
   }
 
   @Test
   public void parseTiming_withNoUrl_throws() {
     String rtpInfoString = "seq=35421887";
 
-    assertThrows(ParserException.class, () -> RtspTrackTiming.parseTrackTiming(rtpInfoString));
+    assertThrows(
+        ParserException.class,
+        () ->
+            RtspTrackTiming.parseTrackTiming(
+                rtpInfoString, Uri.parse("rtsp://video.example.com/twister")));
+  }
+
+  @Test
+  public void resolveUri_withAbsoluteUri_succeeds() {
+    Uri uri =
+        RtspTrackTiming.resolveUri(
+            "rtsp://video.example.com/twister/video=1?a2bfc09887ce",
+            Uri.parse("rtsp://video.example.com/twister"));
+
+    assertThat(uri).isEqualTo(Uri.parse("rtsp://video.example.com/twister/video=1?a2bfc09887ce"));
+  }
+
+  @Test
+  public void resolveUri_withCompleteUriMissingScheme_succeeds() {
+    Uri uri =
+        RtspTrackTiming.resolveUri(
+            "video.example.com/twister/video=1", Uri.parse("rtsp://video.example.com/twister"));
+
+    assertThat(uri).isEqualTo(Uri.parse("rtsp://video.example.com/twister/video=1"));
+  }
+
+  @Test
+  public void resolveUri_withPartialUriMissingScheme_succeeds() {
+    Uri uri = RtspTrackTiming.resolveUri("video=1", Uri.parse("rtsp://video.example.com/twister"));
+
+    assertThat(uri).isEqualTo(Uri.parse("rtsp://video.example.com/twister/video=1"));
+  }
+
+  @Test
+  public void resolveUri_withMultipartPartialUriMissingScheme_succeeds() {
+    Uri uri =
+        RtspTrackTiming.resolveUri(
+            "container/video=1", Uri.parse("rtsp://video.example.com/twister"));
+
+    assertThat(uri).isEqualTo(Uri.parse("rtsp://video.example.com/twister/container/video=1"));
+  }
+
+  @Test
+  public void resolveUri_withPartialUriMissingSchemeWithIpBaseUri_succeeds() {
+    Uri uri = RtspTrackTiming.resolveUri("video=1", Uri.parse("rtsp://127.0.0.1:18888/test"));
+
+    assertThat(uri).isEqualTo(Uri.parse("rtsp://127.0.0.1:18888/test/video=1"));
+  }
+
+  @Test
+  public void resolveUri_withPartialUriMissingSchemeWithIpBaseUriWithSlash_succeeds() {
+    Uri uri = RtspTrackTiming.resolveUri("video=1", Uri.parse("rtsp://127.0.0.1:18888/test/"));
+
+    assertThat(uri).isEqualTo(Uri.parse("rtsp://127.0.0.1:18888/test/video=1"));
+  }
+
+  @Test
+  public void resolveUri_withSessionUriMissingScheme_throwsIllegalArgumentException() {
+    assertThrows(
+        IllegalArgumentException.class,
+        () -> RtspTrackTiming.resolveUri("video=1", Uri.parse("127.0.0.1:18888/test")));
   }
 }