Fix CMCD data assignment for init segment

The CMCD data was incorrectly added to the `dataSpec` of the media segment instead of the init segment.

Also relaxed the condition for playbackRate to be C.RATE_UNSET when creating an instance of CmcdData.Factory as there was nothing enforcing this check.

#minor-release

PiperOrigin-RevId: 639046080

RELEASENOTES.md

@@ -56,6 +56,8 @@
         callbacks and if `ExoPlayer` is set with
         `experimentalSetDynamicSchedulingEnabled`, then `ExoPlayer` will
         schedule its work loop as renderers can make progress.
+    *   Fix bug where enabling CMCD for HLS with initialization segments
+        resulted in `Source Error` and `IllegalArgumentException`.
 *   Transformer:
     *   Work around a decoder bug where the number of audio channels was capped
         at stereo when handling PCM input.

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/upstream/CmcdData.java

@@ -138,7 +138,7 @@ public Factory(
         boolean didRebuffer,
         boolean isBufferEmpty) {
       checkArgument(bufferedDurationUs >= 0);
-      checkArgument(playbackRate > 0);
+      checkArgument(playbackRate == C.RATE_UNSET || playbackRate > 0);
       this.cmcdConfiguration = cmcdConfiguration;
       this.trackSelection = trackSelection;
       this.bufferedDurationUs = bufferedDurationUs;

libraries/exoplayer_hls/src/main/java/androidx/media3/exoplayer/hls/HlsMediaChunk.java

@@ -149,7 +149,7 @@ public static HlsMediaChunk createInstance(
             cmcdDataFactory
                 .setObjectType(CmcdData.Factory.OBJECT_TYPE_INIT_SEGMENT)
                 .createCmcdData();
-        initDataSpec = cmcdData.addToDataSpec(dataSpec);
+        initDataSpec = cmcdData.addToDataSpec(initDataSpec);
       }
 
       initDataSource = buildDataSource(dataSource, initSegmentKey, initSegmentIv);

libraries/exoplayer_hls/src/test/java/androidx/media3/exoplayer/hls/e2etest/HlsPlaybackTest.java

@@ -26,6 +26,8 @@
 import androidx.media3.exoplayer.ExoPlayer;
 import androidx.media3.exoplayer.SeekParameters;
 import androidx.media3.exoplayer.hls.HlsMediaSource;
+import androidx.media3.exoplayer.source.DefaultMediaSourceFactory;
+import androidx.media3.exoplayer.upstream.CmcdConfiguration;
 import androidx.media3.test.utils.CapturingRenderersFactory;
 import androidx.media3.test.utils.DumpFileAsserts;
 import androidx.media3.test.utils.FakeClock;
@@ -190,4 +192,30 @@ public void multiSegment_withSeekToPrevSyncFrame_startsRenderingAtBeginningOfSeg
     DumpFileAsserts.assertOutput(
         applicationContext, playbackOutput, "playbackdumps/hls/multi-segment-with-seek.dump");
   }
+
+  @Test
+  public void cmcdEnabled_withInitSegment() throws Exception {
+    Context applicationContext = ApplicationProvider.getApplicationContext();
+    CapturingRenderersFactory capturingRenderersFactory =
+        new CapturingRenderersFactory(applicationContext);
+    ExoPlayer player =
+        new ExoPlayer.Builder(applicationContext, capturingRenderersFactory)
+            .setClock(new FakeClock(/* isAutoAdvancing= */ true))
+            .setMediaSourceFactory(
+                new DefaultMediaSourceFactory(applicationContext)
+                    .setCmcdConfigurationFactory(CmcdConfiguration.Factory.DEFAULT))
+            .build();
+
+    PlaybackOutput playbackOutput = PlaybackOutput.register(player, capturingRenderersFactory);
+    player.setMediaItem(MediaItem.fromUri("asset:///media/hls/multi-segment/playlist.m3u8"));
+    player.prepare();
+    player.play();
+    TestPlayerRunHelper.runUntilPlaybackState(player, Player.STATE_ENDED);
+    player.release();
+
+    DumpFileAsserts.assertOutput(
+        applicationContext,
+        playbackOutput,
+        "playbackdumps/hls/cmcd-enabled-with-init-segment.dump");
+  }
 }