Avoid skipping the first decoder output buffers after speed change

#minor-release

PiperOrigin-RevId: 355652144

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/TransformerAudioRenderer.java

@@ -227,12 +227,11 @@ import java.nio.ByteBuffer;
     MediaCodecAdapterWrapper decoder = checkNotNull(this.decoder);
 
     if (drainingSonicForSpeedChange) {
-      if (!sonicAudioProcessor.isEnded()) {
-        // Sonic needs draining, but has not fully drained yet.
-        return false;
+      if (sonicAudioProcessor.isEnded() && !sonicOutputBuffer.hasRemaining()) {
+        flushSonicAndSetSpeed(currentSpeed);
+        drainingSonicForSpeedChange = false;
       }
-      flushSonicAndSetSpeed(currentSpeed);
-      drainingSonicForSpeedChange = false;
+      return false;
     }
 
     // Sonic invalidates any previous output buffer when more input is queued, so we don't queue if

testdata/src/test/assets/transformerdumps/mp4/sample_sef_slow_motion.mp4.dump

@@ -123,14 +123,44 @@ sample:
   presentationTimeUs = 36499
 sample:
   trackIndex = 0
-  dataHashCode = -2124187794
+  dataHashCode = 250093960
   isKeyFrame = true
   presentationTimeUs = 44415
 sample:
   trackIndex = 0
-  dataHashCode = 1016665126
+  dataHashCode = 1895536226
   isKeyFrame = true
-  presentationTimeUs = 63081
+  presentationTimeUs = 59998
+sample:
+  trackIndex = 0
+  dataHashCode = 1723596464
+  isKeyFrame = true
+  presentationTimeUs = 81748
+sample:
+  trackIndex = 0
+  dataHashCode = -978803114
+  isKeyFrame = true
+  presentationTimeUs = 101414
+sample:
+  trackIndex = 0
+  dataHashCode = 387377078
+  isKeyFrame = true
+  presentationTimeUs = 121080
+sample:
+  trackIndex = 0
+  dataHashCode = -132658698
+  isKeyFrame = true
+  presentationTimeUs = 140746
+sample:
+  trackIndex = 0
+  dataHashCode = 1495036471
+  isKeyFrame = true
+  presentationTimeUs = 159496
+sample:
+  trackIndex = 0
+  dataHashCode = 304440590
+  isKeyFrame = true
+  presentationTimeUs = 178162
 sample:
   trackIndex = 1
   dataHashCode = 2139021989
@@ -151,6 +181,11 @@ sample:
   dataHashCode = -1893277090
   isKeyFrame = false
   presentationTimeUs = 734083
+sample:
+  trackIndex = 0
+  dataHashCode = -752661703
+  isKeyFrame = true
+  presentationTimeUs = 196412
 sample:
   trackIndex = 1
   dataHashCode = -1554795381