diff --git a/media/extractors/mp4/ItemTable.cpp b/media/extractors/mp4/ItemTable.cpp
index 0b1cfa0..ded3d1a 100644
--- a/media/extractors/mp4/ItemTable.cpp
+++ b/media/extractors/mp4/ItemTable.cpp
@@ -1582,15 +1582,24 @@
         ssize_t thumbItemIndex = mItemIdToItemMap.indexOfKey(image->thumbnails[0]);
         if (thumbItemIndex >= 0) {
             const ImageItem &thumbnail = mItemIdToItemMap[thumbItemIndex];
-            // TODO(vigneshv): Handle thumbnail for AVIF.
-            if (thumbnail.hvcc != NULL) {
+            if (thumbnail.hvcc != NULL || thumbnail.av1c != NULL) {
                 AMediaFormat_setInt32(meta,
                         AMEDIAFORMAT_KEY_THUMBNAIL_WIDTH, thumbnail.width);
                 AMediaFormat_setInt32(meta,
                         AMEDIAFORMAT_KEY_THUMBNAIL_HEIGHT, thumbnail.height);
-                AMediaFormat_setBuffer(meta,
-                        AMEDIAFORMAT_KEY_THUMBNAIL_CSD_HEVC,
-                        thumbnail.hvcc->data(), thumbnail.hvcc->size());
+                if (thumbnail.hvcc != NULL) {
+                    AMediaFormat_setBuffer(meta,
+                            AMEDIAFORMAT_KEY_THUMBNAIL_CSD_HEVC,
+                            thumbnail.hvcc->data(), thumbnail.hvcc->size());
+                } else {
+                    // We use a hard-coded string here instead of
+                    // AMEDIAFORMAT_KEY_THUMBNAIL_CSD_AV1C. The key is available only from SDK 31.
+                    // The mp4 extractor is part of mainline and builds against SDK 29 as of
+                    // writing. This hard-coded string can be replaced with the named constant once
+                    // the mp4 extractor is built against SDK >= 31.
+                    AMediaFormat_setBuffer(meta,
+                            "thumbnail-csd-av1c", thumbnail.av1c->data(), thumbnail.av1c->size());
+                }
                 ALOGV("image[%u]: thumbnail: size %dx%d, item index %zd",
                         imageIndex, thumbnail.width, thumbnail.height, thumbItemIndex);
             } else {
diff --git a/media/libstagefright/FrameDecoder.cpp b/media/libstagefright/FrameDecoder.cpp
index 965b6dd..e783578 100644
--- a/media/libstagefright/FrameDecoder.cpp
+++ b/media/libstagefright/FrameDecoder.cpp
@@ -121,15 +121,23 @@
             false /*allocRotated*/, true /*metaOnly*/);
 }
 
+bool isAvif(const sp<MetaData> &trackMeta) {
+    const char *mime;
+    return trackMeta->findCString(kKeyMIMEType, &mime)
+        && (!strcasecmp(mime, MEDIA_MIMETYPE_VIDEO_AV1)
+            || !strcasecmp(mime, MEDIA_MIMETYPE_IMAGE_AVIF));
+}
+
 bool findThumbnailInfo(
         const sp<MetaData> &trackMeta, int32_t *width, int32_t *height,
         uint32_t *type = NULL, const void **data = NULL, size_t *size = NULL) {
     uint32_t dummyType;
     const void *dummyData;
     size_t dummySize;
+    int codecConfigKey = isAvif(trackMeta) ? kKeyThumbnailAV1C : kKeyThumbnailHVCC;
     return trackMeta->findInt32(kKeyThumbnailWidth, width)
         && trackMeta->findInt32(kKeyThumbnailHeight, height)
-        && trackMeta->findData(kKeyThumbnailHVCC,
+        && trackMeta->findData(codecConfigKey,
                 type ?: &dummyType, data ?: &dummyData, size ?: &dummySize);
 }
 
@@ -752,7 +760,10 @@
         overrideMeta->remove(kKeyDisplayHeight);
         overrideMeta->setInt32(kKeyWidth, mWidth);
         overrideMeta->setInt32(kKeyHeight, mHeight);
-        overrideMeta->setData(kKeyHVCC, type, data, size);
+        // The AV1 codec configuration data is passed via CSD0 to the AV1
+        // decoder.
+        const int codecConfigKey = isAvif(trackMeta()) ? kKeyOpaqueCSD0 : kKeyHVCC;
+        overrideMeta->setData(codecConfigKey, type, data, size);
         options->setSeekTo(-1);
     } else {
         CHECK(trackMeta()->findInt32(kKeyWidth, &mWidth));