Add an E2E test for changing sample rate with AudioProcessor.

PiperOrigin-RevId: 492160193

library/transformer/src/test/java/com/google/android/exoplayer2/transformer/TransformerEndToEndTest.java

@@ -43,6 +43,7 @@ import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.MediaItem;
 import com.google.android.exoplayer2.MediaItem;
+import com.google.android.exoplayer2.audio.SonicAudioProcessor;
 import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory;
 import com.google.android.exoplayer2.extractor.DefaultExtractorsFactory;
 import com.google.android.exoplayer2.extractor.Extractor;
 import com.google.android.exoplayer2.extractor.Extractor;
 import com.google.android.exoplayer2.extractor.ExtractorInput;
 import com.google.android.exoplayer2.extractor.ExtractorInput;
@@ -281,6 +282,23 @@ public final class TransformerEndToEndTest {
   }
   }
 
 
   @Test
   @Test
+  public void startTransformation_adjustSampleRate_completesSuccessfully() throws Exception {
+    SonicAudioProcessor sonicAudioProcessor = new SonicAudioProcessor();
+    sonicAudioProcessor.setOutputSampleRateHz(48000);
+    Transformer transformer =
+        createTransformerBuilder(/* enableFallback= */ false)
+            .setAudioProcessors(ImmutableList.of(sonicAudioProcessor))
+            .build();
+    MediaItem mediaItem = MediaItem.fromUri(ASSET_URI_PREFIX + FILE_AUDIO_VIDEO);
+
+    transformer.startTransformation(mediaItem, outputPath);
+    TransformerTestRunner.runUntilCompleted(transformer);
+
+    DumpFileAsserts.assertOutput(
+        context, testMuxer, getDumpFileName(FILE_AUDIO_VIDEO + ".48000hz"));
+  }
+
+  @Test
   public void startTransformation_withMultipleListeners_callsEachOnCompletion() throws Exception {
   public void startTransformation_withMultipleListeners_callsEachOnCompletion() throws Exception {
     Transformer.Listener mockListener1 = mock(Transformer.Listener.class);
     Transformer.Listener mockListener1 = mock(Transformer.Listener.class);
     Transformer.Listener mockListener2 = mock(Transformer.Listener.class);
     Transformer.Listener mockListener2 = mock(Transformer.Listener.class);

testdata/src/test/assets/transformerdumps/mp4/sample.mp4.48000hz.dump

+format 0:
+  sampleMimeType = audio/mp4a-latm
+  channelCount = 1
+  sampleRate = 48000
+  pcmEncoding = 2
+format 1:
+  id = 1
+  sampleMimeType = video/avc
+  codecs = avc1.64001F
+  maxInputSize = 36722
+  width = 1080
+  height = 720
+  frameRate = 29.970028
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