Clarify SSIM request method name

`requestCalculateSsim` more clearly represents the intention of the caller.

Also rephrase the javadoc to simplify it and make it more precise.

PiperOrigin-RevId: 465575578

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerAndroidTestRunner.java

@@ -52,7 +52,7 @@ public class TransformerAndroidTestRunner {
   public static class Builder {
     private final Context context;
     private final Transformer transformer;
-    private boolean maybeCalculateSsim;
+    private boolean requestCalculateSsim;
     private int timeoutSeconds;
     private boolean suppressAnalysisExceptions;
     @Nullable private Map<String, Object> inputValues;
@@ -85,22 +85,21 @@ public Builder setTimeoutSeconds(int timeoutSeconds) {
     }
 
     /**
-     * Sets whether to try to calculate the SSIM of the transformation output.
+     * Sets whether to calculate the SSIM of the transformation output compared to the input, if
+     * supported. Calculating SSIM is not supported if the input and output video dimensions don't
+     * match, or if the input video is trimmed.
      *
-     * <p>SSIM requires the input and output video dimensions to match. Therefore, if encoder
-     * resolution fallback occurs, this calculation is skipped.
-     *
-     * <p>The calculation involves decoding and comparing both the input and the output video.
-     * Consequently this calculation is not cost-free.
+     * <p>Calculating SSIM involves decoding and comparing frames of the expected and actual videos,
+     * which will increase the runtime of the test.
      *
      * <p>The default value is {@code false}.
      *
-     * @param maybeCalculateSsim Whether to try to calculate SSIM.
+     * @param requestCalculateSsim Whether to calculate SSIM, if supported.
      * @return This {@link Builder}.
      */
     @CanIgnoreReturnValue
-    public Builder setMaybeCalculateSsim(boolean maybeCalculateSsim) {
-      this.maybeCalculateSsim = maybeCalculateSsim;
+    public Builder setRequestCalculateSsim(boolean requestCalculateSsim) {
+      this.requestCalculateSsim = requestCalculateSsim;
       return this;
     }
 
@@ -146,7 +145,7 @@ public TransformerAndroidTestRunner build() {
           context,
           transformer,
           timeoutSeconds,
-          maybeCalculateSsim,
+          requestCalculateSsim,
           suppressAnalysisExceptions,
           inputValues);
     }
@@ -156,15 +155,15 @@ public TransformerAndroidTestRunner build() {
   private final CodecNameForwardingCodecFactory transformerCodecFactory;
   private final Transformer transformer;
   private final int timeoutSeconds;
-  private final boolean maybeCalculateSsim;
+  private final boolean requestCalculateSsim;
   private final boolean suppressAnalysisExceptions;
   @Nullable private final Map<String, Object> inputValues;
 
   private TransformerAndroidTestRunner(
       Context context,
       Transformer transformer,
       int timeoutSeconds,
-      boolean maybeCalculateSsim,
+      boolean requestCalculateSsim,
       boolean suppressAnalysisExceptions,
       @Nullable Map<String, Object> inputValues) {
     this.context = context;
@@ -177,7 +176,7 @@ private TransformerAndroidTestRunner(
             .setEncoderFactory(transformerCodecFactory)
             .build();
     this.timeoutSeconds = timeoutSeconds;
-    this.maybeCalculateSsim = maybeCalculateSsim;
+    this.requestCalculateSsim = requestCalculateSsim;
     this.suppressAnalysisExceptions = suppressAnalysisExceptions;
     this.inputValues = inputValues;
   }
@@ -229,7 +228,7 @@ public TransformationTestResult run(String testId, MediaItem mediaItem) throws E
   private TransformationTestResult runInternal(String testId, MediaItem mediaItem)
       throws InterruptedException, IOException, TimeoutException, TransformationException {
     if (!mediaItem.clippingConfiguration.equals(MediaItem.ClippingConfiguration.UNSET)
-        && maybeCalculateSsim) {
+        && requestCalculateSsim) {
       throw new UnsupportedOperationException(
           "SSIM calculation is not supported for clipped inputs.");
     }
@@ -323,7 +322,7 @@ public void onFallbackApplied(
             .setFilePath(outputVideoFile.getPath())
             .setElapsedTimeMs(elapsedTimeMs);
 
-    if (!maybeCalculateSsim) {
+    if (!requestCalculateSsim) {
       return resultBuilder.build();
     }
     if (fallbackResolutionApplied.get()) {

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/mh/TranscodeQualityTest.java

@@ -67,7 +67,7 @@ public void transformHighQualityTargetingAvcToAvc1920x1080_ssimIsGreaterThan95Pe
 
     TransformationTestResult result =
         new TransformerAndroidTestRunner.Builder(context, transformer)
-            .setMaybeCalculateSsim(true)
+            .setRequestCalculateSsim(true)
             .build()
             .run(
                 testId,
@@ -104,7 +104,7 @@ public void transcodeAvcToHevc_ssimIsGreaterThan90Percent() throws Exception {
 
     TransformationTestResult result =
         new TransformerAndroidTestRunner.Builder(context, transformer)
-            .setMaybeCalculateSsim(true)
+            .setRequestCalculateSsim(true)
             .build()
             .run(
                 testId,
@@ -134,7 +134,7 @@ public void transcodeAvcToAvc320x240_ssimIsGreaterThan90Percent() throws Excepti
 
     TransformationTestResult result =
         new TransformerAndroidTestRunner.Builder(context, transformer)
-            .setMaybeCalculateSsim(true)
+            .setRequestCalculateSsim(true)
             .build()
             .run(
                 testId,

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/mh/TransformationTest.java

@@ -55,7 +55,7 @@ public void transform() throws Exception {
             .setEncoderFactory(new ForceEncodeEncoderFactory(context))
             .build();
     new TransformerAndroidTestRunner.Builder(context, transformer)
-        .setMaybeCalculateSsim(true)
+        .setRequestCalculateSsim(true)
         .build()
         .run(testId, MediaItem.fromUri(Uri.parse(MP4_ASSET_WITH_INCREASING_TIMESTAMPS_URI_STRING)));
   }
@@ -86,7 +86,7 @@ public void transformToSpecificBitrate() throws Exception {
                         .build()))
             .build();
     new TransformerAndroidTestRunner.Builder(context, transformer)
-        .setMaybeCalculateSsim(true)
+        .setRequestCalculateSsim(true)
         .build()
         .run(testId, MediaItem.fromUri(Uri.parse(MP4_ASSET_WITH_INCREASING_TIMESTAMPS_URI_STRING)));
   }
@@ -109,7 +109,7 @@ public void transform4K60() throws Exception {
             .setEncoderFactory(new ForceEncodeEncoderFactory(context))
             .build();
     new TransformerAndroidTestRunner.Builder(context, transformer)
-        .setMaybeCalculateSsim(true)
+        .setRequestCalculateSsim(true)
         .setTimeoutSeconds(180)
         .build()
         .run(testId, MediaItem.fromUri(Uri.parse(MP4_REMOTE_4K60_PORTRAIT_URI_STRING)));
@@ -132,7 +132,7 @@ public void transform8K24() throws Exception {
             .setEncoderFactory(new ForceEncodeEncoderFactory(context))
             .build();
     new TransformerAndroidTestRunner.Builder(context, transformer)
-        .setMaybeCalculateSsim(true)
+        .setRequestCalculateSsim(true)
         .setTimeoutSeconds(180)
         .build()
         .run(testId, MediaItem.fromUri(Uri.parse(MP4_REMOTE_8K24_URI_STRING)));
@@ -148,7 +148,7 @@ public void transformNoAudio() throws Exception {
             .setRemoveAudio(true)
             .build();
     new TransformerAndroidTestRunner.Builder(context, transformer)
-        .setMaybeCalculateSsim(true)
+        .setRequestCalculateSsim(true)
         .build()
         .run(testId, MediaItem.fromUri(Uri.parse(MP4_ASSET_WITH_INCREASING_TIMESTAMPS_URI_STRING)));
   }

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/mh/analysis/BitrateAnalysisTest.java

@@ -157,7 +157,7 @@ public void analyzeBitrate() throws Exception {
 
     new TransformerAndroidTestRunner.Builder(context, transformer)
         .setInputValues(inputValues)
-        .setMaybeCalculateSsim(true)
+        .setRequestCalculateSsim(true)
         .build()
         .run(testId, MediaItem.fromUri(Uri.parse(fileUri)));
   }

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/mh/analysis/SsimMapperTest.java

@@ -306,7 +306,7 @@ private double transformAndGetSsim(int bitrate) throws Exception {
       double ssim =
           new TransformerAndroidTestRunner.Builder(context, transformer)
               .setInputValues(inputValues)
-              .setMaybeCalculateSsim(true)
+              .setRequestCalculateSsim(true)
               .build()
               .run(testId, MediaItem.fromUri(Uri.parse(videoUri)))
               .ssim;