Add a VideoDecoder for ByteBuffers

Fixes #4021

Author: sjudd

library/src/main/java/com/bumptech/glide/Glide.java

@@ -560,6 +560,16 @@ Uri.class, Bitmap.class, new ResourceBitmapDecoder(resourceDrawableDecoder, bitm
                 bitmapPool, bitmapBytesTranscoder, gifDrawableBytesTranscoder))
         .register(GifDrawable.class, byte[].class, gifDrawableBytesTranscoder);
 
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+      ResourceDecoder<ByteBuffer, Bitmap> byteBufferVideoDecoder =
+          VideoDecoder.byteBuffer(bitmapPool);
+      registry.append(ByteBuffer.class, Bitmap.class, byteBufferVideoDecoder);
+      registry.append(
+          ByteBuffer.class,
+          BitmapDrawable.class,
+          new BitmapDrawableDecoder<>(resources, byteBufferVideoDecoder));
+    }
+
     ImageViewTargetFactory imageViewTargetFactory = new ImageViewTargetFactory();
     glideContext =
         new GlideContext(

library/src/main/java/com/bumptech/glide/load/resource/bitmap/VideoDecoder.java

@@ -3,13 +3,15 @@
 import android.annotation.TargetApi;
 import android.content.res.AssetFileDescriptor;
 import android.graphics.Bitmap;
+import android.media.MediaDataSource;
 import android.media.MediaMetadataRetriever;
 import android.os.Build;
 import android.os.Build.VERSION_CODES;
 import android.os.ParcelFileDescriptor;
 import android.util.Log;
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
+import androidx.annotation.RequiresApi;
 import androidx.annotation.VisibleForTesting;
 import com.bumptech.glide.load.Option;
 import com.bumptech.glide.load.Options;
@@ -120,6 +122,11 @@ public static ResourceDecoder<ParcelFileDescriptor, Bitmap> parcel(BitmapPool bi
     return new VideoDecoder<>(bitmapPool, new ParcelFileDescriptorInitializer());
   }
 
+  @RequiresApi(api = VERSION_CODES.M)
+  public static ResourceDecoder<ByteBuffer, Bitmap> byteBuffer(BitmapPool bitmapPool) {
+    return new VideoDecoder<>(bitmapPool, new ByteBufferInitializer());
+  }
+
   VideoDecoder(BitmapPool bitmapPool, MediaMetadataRetrieverInitializer<T> initializer) {
     this(bitmapPool, initializer, DEFAULT_FACTORY);
   }
@@ -299,4 +306,34 @@ public void initialize(MediaMetadataRetriever retriever, ParcelFileDescriptor da
       retriever.setDataSource(data.getFileDescriptor());
     }
   }
+
+  @RequiresApi(Build.VERSION_CODES.M)
+  static final class ByteBufferInitializer
+      implements MediaMetadataRetrieverInitializer<ByteBuffer> {
+
+    @Override
+    public void initialize(MediaMetadataRetriever retriever, final ByteBuffer data) {
+      retriever.setDataSource(
+          new MediaDataSource() {
+            @Override
+            public int readAt(long position, byte[] buffer, int offset, int size) {
+              if (position >= data.limit()) {
+                return -1;
+              }
+              data.position((int) position);
+              int numBytesRead = Math.min(size, data.remaining());
+              data.get(buffer, offset, numBytesRead);
+              return numBytesRead;
+            }
+
+            @Override
+            public long getSize() {
+              return data.limit();
+            }
+
+            @Override
+            public void close() {}
+          });
+    }
+  }
 }