Re-apply CEA-608 validDataChannelTimeoutMs assertion

This change was originally made in 379cb3b.

It was then accidentally lost in when `Cea608Parser` was merged back
into `Cea608Decoder` in 25498b1.

This was spotted when re-doing a similar lost change to `Cea708Decoder`,
reported in #1315.

See reasoning on e2847b3
about why this is the only 'lost' CEA-608 change.

PiperOrigin-RevId: 635803536

Author: icbaker

libraries/extractor/src/main/java/androidx/media3/extractor/text/cea/Cea608Decoder.java

@@ -15,6 +15,7 @@
  */
 package androidx.media3.extractor.text.cea;
 
+import static androidx.media3.common.util.Assertions.checkArgument;
 import static java.lang.Math.min;
 
 import android.graphics.Color;
@@ -365,8 +366,12 @@ public Cea608Decoder(String mimeType, int accessibilityChannel, long validDataCh
     cueBuilders = new ArrayList<>();
     currentCueBuilder = new CueBuilder(CC_MODE_UNKNOWN, DEFAULT_CAPTIONS_ROW_COUNT);
     currentChannel = NTSC_CC_CHANNEL_1;
-    this.validDataChannelTimeoutUs =
-        validDataChannelTimeoutMs > 0 ? validDataChannelTimeoutMs * 1000 : C.TIME_UNSET;
+    if (validDataChannelTimeoutMs != C.TIME_UNSET) {
+      checkArgument(validDataChannelTimeoutMs >= MIN_DATA_CHANNEL_TIMEOUT_MS);
+      this.validDataChannelTimeoutUs = validDataChannelTimeoutMs * 1000;
+    } else {
+      this.validDataChannelTimeoutUs = C.TIME_UNSET;
+    }
     packetLength = MimeTypes.APPLICATION_MP4CEA608.equals(mimeType) ? 2 : 3;
     switch (accessibilityChannel) {
       case 1: