Plumb audio through AudioGraph for Composition preview.

The dump file diff as part of this change is because using AudioGraph
means the 2nd item is automatically edited to match the AudioFormat of
the 1st item {44.1KHz mono}, rather than {48KHz stereo}.

Manually verified that for the 2nd item, data output:
* Before: 66936 bytes (16734 frames) output = 348_625us of audio.
* After: 30750 bytes (15375 frames) output = 348_639us of audio.

The small final buffer is caused by SonicAudioProcessor outputting all
pending data when EOS queued, and is WAI.

PiperOrigin-RevId: 580494578

libraries/common/src/main/java/androidx/media3/common/util/Util.java

@@ -89,6 +89,7 @@ import androidx.media3.common.ParserException;
 import androidx.media3.common.PlaybackException;
 import androidx.media3.common.Player;
 import androidx.media3.common.Player.Commands;
+import androidx.media3.common.audio.AudioProcessor;
 import com.google.common.base.Ascii;
 import com.google.common.base.Charsets;
 import com.google.common.math.DoubleMath;
@@ -2132,6 +2133,12 @@ public final class Util {
         .build();
   }
 
+  /** Gets a PCM {@link Format} based on the {@link AudioProcessor.AudioFormat}. */
+  @UnstableApi
+  public static Format getPcmFormat(AudioProcessor.AudioFormat audioFormat) {
+    return getPcmFormat(audioFormat.encoding, audioFormat.channelCount, audioFormat.sampleRate);
+  }
+
   /**
    * Converts a sample bit depth to a corresponding PCM encoding constant.
    *

libraries/test_data/src/test/assets/audiosinkdumps/wav/sample.wav/highPitch.dump

@@ -0,0 +1,36 @@
+AudioSink:
+  buffer count = 10
+  config:
+    pcmEncoding = 2
+    channelCount = 1
+    sampleRate = 44100
+  buffer #0:
+    time = 1000000000000
+    data = -85819864
+  buffer #1:
+    time = 1000000100000
+    data = 566487491
+  buffer #2:
+    time = 1000000200000
+    data = -1256531710
+  buffer #3:
+    time = 1000000300000
+    data = 793455796
+  buffer #4:
+    time = 1000000400000
+    data = -268235582
+  buffer #5:
+    time = 1000000500000
+    data = -8136122
+  buffer #6:
+    time = 1000000600000
+    data = 1750866613
+  buffer #7:
+    time = 1000000700000
+    data = -1100753636
+  buffer #8:
+    time = 1000000800000
+    data = 507833230
+  buffer #9:
+    time = 1000000900000
+    data = 1472467506

libraries/test_data/src/test/assets/audiosinkdumps/wav/sample.wav_then_sample_rf64.wav.dump

@@ -1,5 +1,5 @@
 AudioSink:
-  buffer count = 14
+  buffer count = 15
   config:
     pcmEncoding = 2
     channelCount = 1
@@ -34,20 +34,18 @@ AudioSink:
   buffer #9:
     time = 1000000900000
     data = 1472467506
-  discontinuity:
-  config:
-    pcmEncoding = 2
-    channelCount = 2
-    sampleRate = 48000
   buffer #10:
     time = 1000001000000
-    data = -278103001
+    data = 1785344804
   buffer #11:
     time = 1000001100000
-    data = 1522105084
+    data = 458152960
   buffer #12:
     time = 1000001200000
-    data = 932319027
+    data = -2129352270
   buffer #13:
     time = 1000001300000
-    data = 325000240
+    data = 1572219123
+  buffer #14:
+    time = 1000001348616
+    data = -2263

libraries/transformer/src/main/java/androidx/media3/transformer/AudioGraph.java

@@ -43,6 +43,20 @@ import java.nio.ByteBuffer;
     outputAudioFormat = AudioFormat.NOT_SET;
   }
 
+  /** Returns whether an {@link AudioFormat} is valid as an input format. */
+  public static boolean isInputAudioFormatValid(AudioFormat format) {
+    if (format.encoding == Format.NO_VALUE) {
+      return false;
+    }
+    if (format.sampleRate == Format.NO_VALUE) {
+      return false;
+    }
+    if (format.channelCount == Format.NO_VALUE) {
+      return false;
+    }
+    return true;
+  }
+
   /** Returns a new {@link AudioGraphInput} instance. */
   public AudioGraphInput registerInput(EditedMediaItem item, Format format) throws ExportException {
     checkArgument(format.pcmEncoding != Format.NO_VALUE);

libraries/transformer/src/main/java/androidx/media3/transformer/AudioGraphInput.java

@@ -22,6 +22,7 @@ import static androidx.media3.common.util.Assertions.checkNotNull;
 import static androidx.media3.common.util.Assertions.checkState;
 import static androidx.media3.common.util.Assertions.checkStateNotNull;
 import static androidx.media3.decoder.DecoderInputBuffer.BUFFER_REPLACEMENT_MODE_DIRECT;
+import static androidx.media3.transformer.AudioGraph.isInputAudioFormatValid;
 
 import androidx.annotation.Nullable;
 import androidx.media3.common.C;
@@ -367,22 +368,6 @@ import java.util.concurrent.atomic.AtomicReference;
     return audioProcessingPipeline;
   }
 
-  private static boolean isInputAudioFormatValid(AudioFormat format) {
-    if (format.encoding == Format.NO_VALUE) {
-      return false;
-    }
-    if (format.sampleRate == Format.NO_VALUE) {
-      return false;
-    }
-    if (format.channelCount == Format.NO_VALUE) {
-      return false;
-    }
-    if (format.bytesPerFrame == Format.NO_VALUE) {
-      return false;
-    }
-    return true;
-  }
-
   private static final class MediaItemChange {
     public final EditedMediaItem editedMediaItem;
     public final long durationUs;