--- a/dom/media/MediaData.h
+++ b/dom/media/MediaData.h
@@ -9,16 +9,17 @@
 #include "AudioSampleFormat.h"
 #include "ImageTypes.h"
 #include "nsSize.h"
 #include "mozilla/gfx/Rect.h"
 #include "nsRect.h"
 #include "nsIMemoryReporter.h"
 #include "SharedBuffer.h"
 #include "mozilla/RefPtr.h"
+#include "mozilla/Span.h"
 #include "mozilla/UniquePtr.h"
 #include "mozilla/UniquePtrExtensions.h"
 #include "nsTArray.h"
 #include "mozilla/CheckedInt.h"
 #include "mozilla/PodOperations.h"
 #include "TimeUnits.h"
 
 namespace mozilla {
@@ -657,16 +658,18 @@ public:
   size_t Size() const { return mBuffer.Length(); }
   size_t AlphaSize() const { return mAlphaBuffer.Length(); }
   size_t ComputedSizeOfIncludingThis() const
   {
     return sizeof(*this)
            + mBuffer.ComputedSizeOfExcludingThis()
            + mAlphaBuffer.ComputedSizeOfExcludingThis();
   }
+  // Access the buffer as a Span.
+  operator Span<const uint8_t>() { return MakeSpan(Data(), Size()); }
 
   const CryptoSample& mCrypto;
   RefPtr<MediaByteBuffer> mExtraData;
 
   // Used by the Vorbis decoder and Ogg demuxer.
   // Indicates that this is the last packet of the stream.
   bool mEOS = false;