Use default profile-level-id if absent in Describe SDP for MPEG4-LATM

PiperOrigin-RevId: 524003092

RELEASENOTES.md

@@ -98,6 +98,9 @@
     *   Retry with TCP if RTSP Setup with UDP fails with RTSP Error 461
         UnsupportedTransport
         ([#11069](https://github.com/google/ExoPlayer/issues/11069)).
+    *   For MPEG4-LATM, use default profile-level-id value if absent in Describe
+        Response SDP message
+        ([#302](https://github.com/androidx/media/issues/302)).
 *   IMA DAI extension:
     *   Fix a bug where a new ad group is inserted in live streams because the
         calculated content position in consecutive timelines varies slightly.

libraries/exoplayer_rtsp/src/main/java/androidx/media3/exoplayer/rtsp/RtspMediaTrack.java

@@ -229,7 +229,8 @@ import com.google.common.collect.ImmutableMap;
               .setChannelCount(aacConfig.channelCount)
               .setCodecs(aacConfig.codecs);
         }
-        processAacFmtpAttribute(formatBuilder, fmtpParameters, channelCount, clockRate);
+        processAacFmtpAttribute(
+            formatBuilder, fmtpParameters, mediaEncoding, channelCount, clockRate);
         break;
       case MimeTypes.AUDIO_AMR_NB:
       case MimeTypes.AUDIO_AMR_WB:
@@ -311,11 +312,17 @@ import com.google.common.collect.ImmutableMap;
   private static void processAacFmtpAttribute(
       Format.Builder formatBuilder,
       ImmutableMap<String, String> fmtpAttributes,
+      String mediaEncoding,
       int channelCount,
       int sampleRate) {
+    @Nullable String profileLevel = fmtpAttributes.get(PARAMETER_PROFILE_LEVEL_ID);
+    if (profileLevel == null && mediaEncoding.equals(RtpPayloadFormat.RTP_MEDIA_MPEG4_LATM_AUDIO)) {
+      // As defined in RFC3016 Section 5.3 for MPEG4-LATM, if profile-level-id is not specified,
+      // then a default value of 30 should be used.
+      profileLevel = "30";
+    }
     checkArgument(
-        fmtpAttributes.containsKey(PARAMETER_PROFILE_LEVEL_ID), "missing profile-level-id param");
+        profileLevel != null && !profileLevel.isEmpty(), "missing profile-level-id param");
-    String profileLevel = checkNotNull(fmtpAttributes.get(PARAMETER_PROFILE_LEVEL_ID));
     formatBuilder.setCodecs(AAC_CODECS_PREFIX + profileLevel);
     formatBuilder.setInitializationData(
         ImmutableList.of(

libraries/exoplayer_rtsp/src/test/java/androidx/media3/exoplayer/rtsp/RtspMediaTrackTest.java

@@ -402,6 +402,22 @@ public class RtspMediaTrackTest {
     assertThat(rtpPayloadFormat.format.codecs).isEqualTo("avc1.64001F");
   }
 
+  @Test
+  public void
+      generatePayloadFormat_withMpeg4LatmMediaDescriptionMissingProfileLevel_generatesCorrectProfileLevel() {
+    MediaDescription mediaDescription =
+        new MediaDescription.Builder(
+                MEDIA_TYPE_AUDIO, /* port= */ 0, RTP_AVP_PROFILE, /* payloadType= */ 96)
+            .setConnection("IN IP4 0.0.0.0")
+            .setBitrate(96_000)
+            .addAttribute(ATTR_RTPMAP, "96 MP4A-LATM/44100")
+            .addAttribute(ATTR_FMTP, "96 config=40002410adca00; cpresent=0")
+            .addAttribute(ATTR_CONTROL, "track1")
+            .build();
+    RtpPayloadFormat rtpPayloadFormat = RtspMediaTrack.generatePayloadFormat(mediaDescription);
+    assertThat(rtpPayloadFormat.format.codecs).isEqualTo("mp4a.40.30");
+  }
+
   @Test
   public void
       generatePayloadFormat_withAacMediaDescriptionMissingFmtpAttribute_throwsIllegalArgumentException() {
@@ -420,7 +436,7 @@ public class RtspMediaTrackTest {
 
   @Test
   public void
-      generatePayloadFormat_withMediaDescriptionMissingProfileLevel_throwsIllegalArgumentException() {
+      generatePayloadFormat_withMpeg4GenericMediaDescriptionMissingProfileLevel_throwsIllegalArgumentException() {
     MediaDescription mediaDescription =
         new MediaDescription.Builder(
                 MEDIA_TYPE_AUDIO, /* port= */ 0, RTP_AVP_PROFILE, /* payloadType= */ 97)
@@ -437,6 +453,25 @@ public class RtspMediaTrackTest {
         () -> RtspMediaTrack.generatePayloadFormat(mediaDescription));
   }
 
+  @Test
+  public void
+      generatePayloadFormat_withMpeg4GenericMediaDescriptionEmptyProfileLevel_throwsIllegalArgumentException() {
+    MediaDescription mediaDescription =
+        new MediaDescription.Builder(
+                MEDIA_TYPE_AUDIO, /* port= */ 0, RTP_AVP_PROFILE, /* payloadType= */ 97)
+            .setConnection("IN IP4 0.0.0.0")
+            .setBitrate(96_000)
+            .addAttribute(ATTR_RTPMAP, "97 MPEG4-GENERIC/44100")
+            .addAttribute(
+                ATTR_FMTP,
+                "97 streamtype=5;mode=AAC-hbr;sizelength=13;indexlength=3;indexdeltalength=3;config=1208;profile-level-id=;")
+            .addAttribute(ATTR_CONTROL, "track1")
+            .build();
+    assertThrows(
+        IllegalArgumentException.class,
+        () -> RtspMediaTrack.generatePayloadFormat(mediaDescription));
+  }
+
   @Test
   public void
       generatePayloadFormat_withH264MediaDescriptionMissingFmtpAttribute_throwsIllegalArgumentException() {