Remove some sanity occurrences in Java files

Remove occurrences in comments and private fields.

ISSUE: #7565
PiperOrigin-RevId: 319828820

library/common/src/test/java/com/google/android/exoplayer2/CTest.java

@@ -31,7 +31,7 @@ public class CTest {
   @SuppressLint("InlinedApi")
   @Test
   public void bufferFlagConstants_equalToMediaCodecConstants() {
-    // Sanity check that constant values match those defined by the platform.
+    // Check that constant values match those defined by the platform.
     assertThat(C.BUFFER_FLAG_KEY_FRAME).isEqualTo(MediaCodec.BUFFER_FLAG_KEY_FRAME);
     assertThat(C.BUFFER_FLAG_END_OF_STREAM).isEqualTo(MediaCodec.BUFFER_FLAG_END_OF_STREAM);
     assertThat(C.CRYPTO_MODE_AES_CTR).isEqualTo(MediaCodec.CRYPTO_MODE_AES_CTR);
@@ -40,7 +40,7 @@ public class CTest {
   @SuppressLint("InlinedApi")
   @Test
   public void encodingConstants_equalToAudioFormatConstants() {
-    // Sanity check that encoding constant values match those defined by the platform.
+    // Check that encoding constant values match those defined by the platform.
     assertThat(C.ENCODING_PCM_16BIT).isEqualTo(AudioFormat.ENCODING_PCM_16BIT);
     assertThat(C.ENCODING_MP3).isEqualTo(AudioFormat.ENCODING_MP3);
     assertThat(C.ENCODING_PCM_FLOAT).isEqualTo(AudioFormat.ENCODING_PCM_FLOAT);

library/core/src/main/java/com/google/android/exoplayer2/MediaPeriodHolder.java

@@ -297,7 +297,7 @@ import org.checkerframework.checker.nullness.compatqual.NullableType;
             positionUs);
     associateNoSampleRenderersWithEmptySampleStream(sampleStreams);
 
-    // Update whether we have enabled tracks and sanity check the expected streams are non-null.
+    // Update whether we have enabled tracks and check that the expected streams are non-null.
     hasEnabledTracks = false;
     for (int i = 0; i < sampleStreams.length; i++) {
       if (sampleStreams[i] != null) {

library/core/src/main/java/com/google/android/exoplayer2/audio/AudioTrackPositionTracker.java

@@ -435,7 +435,7 @@ import java.lang.reflect.Method;
       return;
     }
 
-    // Perform sanity checks on the timestamp and accept/reject it.
+    // Check the timestamp and accept/reject it.
     long audioTimestampSystemTimeUs = audioTimestampPoller.getTimestampSystemTimeUs();
     long audioTimestampPositionFrames = audioTimestampPoller.getTimestampPositionFrames();
     if (Math.abs(audioTimestampSystemTimeUs - systemTimeUs) > MAX_AUDIO_TIMESTAMP_OFFSET_US) {
@@ -469,9 +469,9 @@ import java.lang.reflect.Method;
             castNonNull((Integer) getLatencyMethod.invoke(Assertions.checkNotNull(audioTrack)))
                     * 1000L
                 - bufferSizeUs;
-        // Sanity check that the latency is non-negative.
+        // Check that the latency is non-negative.
         latencyUs = Math.max(latencyUs, 0);
-        // Sanity check that the latency isn't too large.
+        // Check that the latency isn't too large.
         if (latencyUs > MAX_LATENCY_US) {
           listener.onInvalidLatency(latencyUs);
           latencyUs = 0;

library/core/src/main/java/com/google/android/exoplayer2/audio/DefaultAudioSink.java

@@ -708,7 +708,7 @@ public final class DefaultAudioSink implements AudioSink {
         afterDrainParameters = null;
       }
 
-      // Sanity check that presentationTimeUs is consistent with the expected value.
+      // Check that presentationTimeUs is consistent with the expected value.
       long expectedPresentationTimeUs =
           startMediaTimeUs
               + configuration.inputFramesToDurationUs(

library/core/src/main/java/com/google/android/exoplayer2/drm/DefaultDrmSession.java

@@ -421,8 +421,8 @@ import org.checkerframework.checker.nullness.qual.RequiresNonNull;
       case DefaultDrmSessionManager.MODE_RELEASE:
         Assertions.checkNotNull(offlineLicenseKeySetId);
         Assertions.checkNotNull(this.sessionId);
-        // It's not necessary to restore the key (and open a session to do that) before releasing it
+        // It's not necessary to restore the key before releasing it but this serves as a good
-        // but this serves as a good sanity/fast-failure check.
+        // fast-failure check.
         if (restoreKeys()) {
           postKeyRequest(offlineLicenseKeySetId, ExoMediaDrm.KEY_TYPE_RELEASE, allowRetry);
         }

library/core/src/main/java/com/google/android/exoplayer2/text/subrip/SubripDecoder.java

@@ -84,7 +84,7 @@ public final class SubripDecoder extends SimpleSubtitleDecoder {
         continue;
       }
 
-      // Parse the index line as a sanity check.
+      // Parse and check the index line.
       try {
         Integer.parseInt(currentLine);
       } catch (NumberFormatException e) {

library/core/src/main/java/com/google/android/exoplayer2/util/SntpClient.java

@@ -160,7 +160,7 @@ public final class SntpClient {
       final long receiveTime = readTimestamp(buffer, RECEIVE_TIME_OFFSET);
       final long transmitTime = readTimestamp(buffer, TRANSMIT_TIME_OFFSET);
 
-      // Do sanity check according to RFC.
+      // Check server reply validity according to RFC.
       checkValidServerReply(leap, mode, stratum, transmitTime);
 
       // receiveTime = originateTime + transit + skew

library/core/src/main/java/com/google/android/exoplayer2/video/spherical/ProjectionDecoder.java

@@ -43,7 +43,7 @@ public final class ProjectionDecoder {
   private static final int TYPE_MESH = 0x6d657368;
   private static final int TYPE_PROJ = 0x70726f6a;
 
-  // Sanity limits to prevent a bad file from creating an OOM situation. We don't expect a mesh to
+  // Limits to prevent a bad file from creating an OOM situation. We don't expect a mesh to
   // exceed these limits.
   private static final int MAX_COORDINATE_COUNT = 10_000;
   private static final int MAX_VERTEX_COUNT = 32 * 1000;

library/core/src/test/java/com/google/android/exoplayer2/upstream/cache/CacheDataSourceTest2.java

@@ -179,13 +179,13 @@ public final class CacheDataSourceTest2 {
         null); // eventListener
   }
 
-  private static void emptyCache(Cache cache) throws CacheException {
+  private static void emptyCache(Cache cache) {
     for (String key : cache.getKeys()) {
       for (CacheSpan span : cache.getCachedSpans(key)) {
         cache.removeSpan(span);
       }
     }
-    // Sanity check that the cache really is empty now.
+    // Check that the cache really is empty now.
     assertThat(cache.getKeys().isEmpty()).isTrue();
   }
 

library/extractor/src/test/java/com/google/android/exoplayer2/extractor/ExtractorTest.java

@@ -28,9 +28,9 @@ public final class ExtractorTest {
 
   @Test
   public void constants() {
-    // Sanity check that constant values match those defined by {@link C}.
+    // Check that constant values match those defined by {@link C}.
     assertThat(Extractor.RESULT_END_OF_INPUT).isEqualTo(C.RESULT_END_OF_INPUT);
-    // Sanity check that the other constant values don't overlap.
+    // Check that the other constant values don't overlap.
     assertThat(C.RESULT_END_OF_INPUT != Extractor.RESULT_CONTINUE).isTrue();
     assertThat(C.RESULT_END_OF_INPUT != Extractor.RESULT_SEEK).isTrue();
   }

library/extractor/src/test/java/com/google/android/exoplayer2/extractor/mp4/MetadataUtilTest.java

@@ -27,7 +27,7 @@ public final class MetadataUtilTest {
 
   @Test
   public void standardGenre_length_matchesNumberOfId3Genres() {
-    // Sanity check that we haven't forgotten a genre in the list.
+    // Check that we haven't forgotten a genre in the list.
     assertThat(MetadataUtil.STANDARD_GENRES).hasLength(192);
   }
 }