Add BitmapDecoder interface

PiperOrigin-RevId: 557827954

libraries/exoplayer/src/androidTest/java/androidx/media3/exoplayer/image/DefaultImageDecoderTest.java

@@ -15,15 +15,18 @@
  */
 package androidx.media3.exoplayer.image;
 
+import static androidx.media3.common.util.Assertions.checkNotNull;
 import static com.google.common.truth.Truth.assertThat;
 import static org.junit.Assert.assertThrows;
 
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.Matrix;
+import androidx.media3.decoder.DecoderInputBuffer;
 import androidx.media3.test.utils.TestUtil;
 import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
+import java.nio.ByteBuffer;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
@@ -36,16 +39,20 @@ public class DefaultImageDecoderTest {
   private static final String PNG_TEST_IMAGE_PATH = "media/png/non-motion-photo-shortened.png";
   private static final String JPEG_TEST_IMAGE_PATH = "media/jpeg/non-motion-photo-shortened.jpg";
 
-  private DefaultImageDecoder imageDecoder;
+  private DefaultImageDecoder decoder;
+  private DecoderInputBuffer inputBuffer;
+  private ImageOutputBuffer outputBuffer;
 
   @Before
   public void setUp() {
-    imageDecoder = new DefaultImageDecoder();
+    decoder = new DefaultImageDecoder.Factory().createImageDecoder();
+    inputBuffer = decoder.createInputBuffer();
+    outputBuffer = decoder.createOutputBuffer();
   }
 
   @After
   public void tearDown() {
-    imageDecoder.release();
+    decoder.release();
   }
 
   @Test
@@ -53,7 +60,7 @@ public class DefaultImageDecoderTest {
     byte[] imageData =
         TestUtil.getByteArray(ApplicationProvider.getApplicationContext(), PNG_TEST_IMAGE_PATH);
 
-    Bitmap bitmap = imageDecoder.decode(imageData, imageData.length);
+    Bitmap bitmap = decode(imageData);
 
     assertThat(
             bitmap.sameAs(
@@ -79,14 +86,22 @@ public class DefaultImageDecoderTest {
             rotationMatrix,
             /* filter= */ false);
 
-    Bitmap actualBitmap = imageDecoder.decode(imageData, imageData.length);
+    Bitmap actualBitmap = decode(imageData);
 
     assertThat(actualBitmap.sameAs(expectedBitmap)).isTrue();
   }
 
   @Test
   public void decodeBitmap_withInvalidData_throws() throws ImageDecoderException {
-    assertThrows(
-        ImageDecoderException.class, () -> imageDecoder.decode(new byte[1], /* length= */ 1));
+    assertThrows(ImageDecoderException.class, () -> decode(new byte[1]));
+  }
+
+  private Bitmap decode(byte[] data) throws Exception {
+    inputBuffer.data = ByteBuffer.wrap(data);
+    Exception e = decoder.decode(inputBuffer, outputBuffer, /* reset= */ false);
+    if (e != null) {
+      throw e;
+    }
+    return checkNotNull(outputBuffer.bitmap);
   }
 }

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/image/DefaultImageDecoder.java

@@ -45,13 +45,27 @@ import java.nio.ByteBuffer;
  * alongside one timestamp)).
  */
 @UnstableApi
-public class DefaultImageDecoder
+public final class DefaultImageDecoder
     extends SimpleDecoder<DecoderInputBuffer, ImageOutputBuffer, ImageDecoderException>
     implements ImageDecoder {
 
+  /** A functional interface for turning byte arrays into bitmaps. */
+  public interface BitmapDecoder {
+
+    /**
+     * Decodes data into a {@link Bitmap}.
+     *
+     * @param data An array holding the data to be decoded, starting at position 0.
+     * @param length The length of the input to be decoded.
+     * @return The decoded {@link Bitmap}.
+     * @throws ImageDecoderException If a decoding error occurs.
+     */
+    Bitmap decode(byte[] data, int length) throws ImageDecoderException;
+  }
+
   /** A factory for {@link DefaultImageDecoder} instances. */
   public static final class Factory implements ImageDecoder.Factory {
-
+    private final BitmapDecoder bitmapDecoder;
     private static final ImmutableSet<String> SUPPORTED_IMAGE_TYPES =
         ImmutableSet.of(
             MimeTypes.IMAGE_PNG,
@@ -60,6 +74,22 @@ public class DefaultImageDecoder
             MimeTypes.IMAGE_HEIF,
             MimeTypes.IMAGE_WEBP);
 
+    /**
+     * Creates an instance using a {@link BitmapFactory} implementation of {@link BitmapDecoder}.
+     */
+    public Factory() {
+      this.bitmapDecoder = DefaultImageDecoder::decode;
+    }
+
+    /**
+     * Creates an instance.
+     *
+     * @param bitmapDecoder The {@link BitmapDecoder} used to turn a byte arrays into a bitmap.
+     */
+    public Factory(BitmapDecoder bitmapDecoder) {
+      this.bitmapDecoder = bitmapDecoder;
+    }
+
     @Override
     public @RendererCapabilities.Capabilities int supportsFormat(Format format) {
       if (!MimeTypes.isImage(format.containerMimeType)) {
@@ -75,13 +105,15 @@ public class DefaultImageDecoder
 
     @Override
     public DefaultImageDecoder createImageDecoder() {
-      return new DefaultImageDecoder();
+      return new DefaultImageDecoder(bitmapDecoder);
     }
   }
 
-  /** Creates an instance. */
-  public DefaultImageDecoder() {
+  private final BitmapDecoder bitmapDecoder;
+
+  private DefaultImageDecoder(BitmapDecoder bitmapDecoder) {
     super(new DecoderInputBuffer[1], new ImageOutputBuffer[1]);
+    this.bitmapDecoder = bitmapDecoder;
   }
 
   @Override
@@ -117,7 +149,7 @@ public class DefaultImageDecoder
       ByteBuffer inputData = checkNotNull(inputBuffer.data);
       checkState(inputData.hasArray());
       checkArgument(inputData.arrayOffset() == 0);
-      outputBuffer.bitmap = decode(inputData.array(), inputData.remaining());
+      outputBuffer.bitmap = bitmapDecoder.decode(inputData.array(), inputData.remaining());
       outputBuffer.timeUs = inputBuffer.timeUs;
       return null;
     } catch (ImageDecoderException e) {
@@ -133,7 +165,7 @@ public class DefaultImageDecoder
    * @return The decoded {@link Bitmap}.
    * @throws ImageDecoderException If a decoding error occurs.
    */
-  /* package */ Bitmap decode(byte[] data, int length) throws ImageDecoderException {
+  private static Bitmap decode(byte[] data, int length) throws ImageDecoderException {
     @Nullable Bitmap bitmap = BitmapFactory.decodeByteArray(data, /* offset= */ 0, length);
     if (bitmap == null) {
       throw new ImageDecoderException(

libraries/exoplayer/src/test/java/androidx/media3/exoplayer/image/DefaultImageDecoderBufferQueueTest.java

@@ -42,22 +42,17 @@ public class DefaultImageDecoderBufferQueueTest {
   private Bitmap decodedBitmap1;
   private Bitmap decodedBitmap2;
 
+  public int decodeCallCount;
+
   @Before
   public void setUp() throws Exception {
+    decodeCallCount = 0;
     decodedBitmap1 = Bitmap.createBitmap(/* width= */ 1, /* height= */ 1, Bitmap.Config.ARGB_8888);
     decodedBitmap2 = Bitmap.createBitmap(/* width= */ 2, /* height= */ 2, Bitmap.Config.ARGB_8888);
     fakeImageDecoder =
-        new DefaultImageDecoder() {
-
-          public int decodeCallCount;
-
-          /** Overrides the decode method to fake it. */
-          @Override
-          protected Bitmap decode(byte[] data, int length) {
-            decodeCallCount++;
-            return decodeCallCount == 1 ? decodedBitmap1 : decodedBitmap2;
-          }
-        };
+        new DefaultImageDecoder.Factory(
+                (data, length) -> ++decodeCallCount == 1 ? decodedBitmap1 : decodedBitmap2)
+            .createImageDecoder();
   }
 
   @After