Ignore mandatory SDP fields as ExoPlayer doesn't use them

Issue: google/ExoPlayer#10049
PiperOrigin-RevId: 444833508

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

@@ -199,13 +199,8 @@ import java.util.HashMap;
      * Builds a new {@link SessionDescription} instance.
      *
      * @return The newly built {@link SessionDescription} instance.
-     * @throws IllegalStateException When one or more of {@link #sessionName}, {@link #timing} and
-     *     {@link #origin} is not set.
      */
     public SessionDescription build() {
-      if (sessionName == null || origin == null || timing == null) {
-        throw new IllegalStateException("One of more mandatory SDP fields are not set.");
-      }
       return new SessionDescription(this);
     }
   }
@@ -237,11 +232,11 @@ import java.util.HashMap;
    */
   public final ImmutableList<MediaDescription> mediaDescriptionList;
   /** The name of a session. */
-  public final String sessionName;
+  @Nullable public final String sessionName;
   /** The origin sender info. */
-  public final String origin;
+  @Nullable public final String origin;
   /** The timing info. */
-  public final String timing;
+  @Nullable public final String timing;
   /** The estimated bitrate in bits per seconds. */
   public final int bitrate;
   /** The uri of a linked content. */
@@ -285,9 +280,9 @@ import java.util.HashMap;
     return bitrate == that.bitrate
         && attributes.equals(that.attributes)
         && mediaDescriptionList.equals(that.mediaDescriptionList)
-        && origin.equals(that.origin)
-        && sessionName.equals(that.sessionName)
-        && timing.equals(that.timing)
+        && Util.areEqual(origin, that.origin)
+        && Util.areEqual(sessionName, that.sessionName)
+        && Util.areEqual(timing, that.timing)
         && Util.areEqual(sessionInfo, that.sessionInfo)
         && Util.areEqual(uri, that.uri)
         && Util.areEqual(emailAddress, that.emailAddress)
@@ -301,9 +296,9 @@ import java.util.HashMap;
     int result = 7;
     result = 31 * result + attributes.hashCode();
     result = 31 * result + mediaDescriptionList.hashCode();
-    result = 31 * result + origin.hashCode();
-    result = 31 * result + sessionName.hashCode();
-    result = 31 * result + timing.hashCode();
+    result = 31 * result + (origin == null ? 0 : origin.hashCode());
+    result = 31 * result + (sessionName == null ? 0 : sessionName.hashCode());
+    result = 31 * result + (timing == null ? 0 : timing.hashCode());
     result = 31 * result + bitrate;
     result = 31 * result + (sessionInfo == null ? 0 : sessionInfo.hashCode());
     result = 31 * result + (uri == null ? 0 : uri.hashCode());

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

@@ -20,7 +20,6 @@ import static com.google.common.truth.Truth.assertThat;
 import android.net.Uri;
 import androidx.annotation.Nullable;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
-import com.google.android.exoplayer2.ParserException;
 import com.google.android.exoplayer2.robolectric.RobolectricUtil;
 import com.google.android.exoplayer2.source.rtsp.RtspClient.PlaybackEventListener;
 import com.google.android.exoplayer2.source.rtsp.RtspClient.SessionInfoListener;
@@ -345,7 +344,7 @@ public final class RtspClientTest {
   }
 
   @Test
-  public void connectServerAndClient_malformedSdpInDescribeResponse_doesNotUpdateTimeline()
+  public void connectServerAndClient_sdpInDescribeResponseHasNoTracks_doesNotUpdateTimeline()
       throws Exception {
     class ResponseProvider implements RtspServer.ResponseProvider {
       @Override
@@ -357,14 +356,16 @@ public final class RtspClientTest {
 
       @Override
       public RtspResponse getDescribeResponse(Uri requestedUri, RtspHeaders headers) {
-        // This session description misses required the o, t and s tags.
         return RtspTestUtils.newDescribeResponseWithSdpMessage(
-            /* sessionDescription= */ "v=0\r\n", rtpPacketStreamDumps, requestedUri);
+            /* sessionDescription= */ "v=0\r\n",
+            // This session description has no tracks.
+            /* rtpPacketStreamDumps= */ ImmutableList.of(),
+            requestedUri);
       }
     }
     rtspServer = new RtspServer(new ResponseProvider());
 
-    AtomicReference<Throwable> failureCause = new AtomicReference<>();
+    AtomicBoolean timelineRequestFailed = new AtomicBoolean();
     rtspClient =
         new RtspClient(
             new SessionInfoListener() {
@@ -375,7 +376,7 @@ public final class RtspClientTest {
               @Override
               public void onSessionTimelineRequestFailed(
                   String message, @Nullable Throwable cause) {
-                failureCause.set(cause);
+                timelineRequestFailed.set(true);
               }
             },
             EMPTY_PLAYBACK_LISTENER,
@@ -385,8 +386,7 @@ public final class RtspClientTest {
             /* debugLoggingEnabled= */ false);
     rtspClient.start();
 
-    RobolectricUtil.runMainLooperUntil(() -> failureCause.get() != null);
-    assertThat(failureCause.get()).hasCauseThat().isInstanceOf(ParserException.class);
+    RobolectricUtil.runMainLooperUntil(timelineRequestFailed::get);
     assertThat(rtspClient.getState()).isEqualTo(RtspClient.RTSP_STATE_UNINITIALIZED);
   }
 }

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

@@ -86,6 +86,48 @@ public class SessionDescriptionTest {
   }
 
   @Test
+  public void parse_sdpStringWithoutMandatoryFields_succeeds() throws Exception {
+    // This SDP string is similar to the one in parse_sdpString_succeeds(), it doesn't include the
+    // mandatory SDP fields origin, session name, session info and timing.
+    String testMediaSdpInfo =
+        "v=0\r\n"
+            + "u=http://www.example.com/lectures/sdp.ps\r\n"
+            + "e=seminar@example.com (Seminar Management)\r\n"
+            + "c=IN IP4 0.0.0.0\r\n"
+            + "a=control:*\r\n"
+            + "m=audio 3456 RTP/AVP 0\r\n"
+            + "a=control:audio\r\n"
+            + "a=rtpmap:0 PCMU/8000\r\n"
+            + "a=3GPP-Adaption-Support:1\r\n"
+            + "m=video 2232 RTP/AVP 31\r\n"
+            + "a=control:video\r\n"
+            + "a=rtpmap:31 H261/90000\r\n";
+
+    SessionDescription sessionDescription = SessionDescriptionParser.parse(testMediaSdpInfo);
+
+    SessionDescription expectedSession =
+        new SessionDescription.Builder()
+            .setUri(Uri.parse("http://www.example.com/lectures/sdp.ps"))
+            .setEmailAddress("seminar@example.com (Seminar Management)")
+            .setConnection("IN IP4 0.0.0.0")
+            .addAttribute(ATTR_CONTROL, "*")
+            .addMediaDescription(
+                new MediaDescription.Builder(MEDIA_TYPE_AUDIO, 3456, RTP_AVP_PROFILE, 0)
+                    .addAttribute(ATTR_CONTROL, "audio")
+                    .addAttribute(ATTR_RTPMAP, "0 PCMU/8000")
+                    .addAttribute("3GPP-Adaption-Support", "1")
+                    .build())
+            .addMediaDescription(
+                new MediaDescription.Builder(MEDIA_TYPE_VIDEO, 2232, RTP_AVP_PROFILE, 31)
+                    .addAttribute(ATTR_CONTROL, "video")
+                    .addAttribute(ATTR_RTPMAP, "31 H261/90000")
+                    .build())
+            .build();
+
+    assertThat(sessionDescription).isEqualTo(expectedSession);
+  }
+
+  @Test
   public void parse_sdpString2_succeeds() throws Exception {
     String testMediaSdpInfo =
         "v=0\r\n"