1 files changed, 57 insertions, 0 deletions
diff --git a/dom/media/platforms/agnostic/NullDecoderModule.cpp b/dom/media/platforms/agnostic/NullDecoderModule.cpp
new file mode 100644
index 0000000000..2893a4af67
--- /dev/null
+++ b/dom/media/platforms/agnostic/NullDecoderModule.cpp
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "DummyMediaDataDecoder.h"
+#include "ImageContainer.h"
+
+namespace mozilla {
+
+class NullVideoDataCreator : public DummyDataCreator {
+ public:
+  NullVideoDataCreator() = default;
+
+  already_AddRefed<MediaData> Create(MediaRawData* aSample) override {
+    // Create a dummy VideoData with an empty image. This gives us something to
+    // send to media streams if necessary.
+    RefPtr<layers::PlanarYCbCrImage> image =
+        new layers::RecyclingPlanarYCbCrImage(new layers::BufferRecycleBin());
+    return VideoData::CreateFromImage(gfx::IntSize(), aSample->mOffset,
+                                      aSample->mTime, aSample->mDuration, image,
+                                      aSample->mKeyframe, aSample->mTimecode);
+  }
+};
+
+class NullDecoderModule : public PlatformDecoderModule {
+ public:
+  // Decode thread.
+  already_AddRefed<MediaDataDecoder> CreateVideoDecoder(
+      const CreateDecoderParams& aParams) override {
+    UniquePtr<DummyDataCreator> creator = MakeUnique<NullVideoDataCreator>();
+    RefPtr<MediaDataDecoder> decoder = new DummyMediaDataDecoder(
+        std::move(creator), "null media data decoder"_ns, aParams);
+    return decoder.forget();
+  }
+
+  // Decode thread.
+  already_AddRefed<MediaDataDecoder> CreateAudioDecoder(
+      const CreateDecoderParams& aParams) override {
+    MOZ_ASSERT(false, "Audio decoders are unsupported.");
+    return nullptr;
+  }
+
+  media::DecodeSupportSet SupportsMimeType(
+      const nsACString& aMimeType,
+      DecoderDoctorDiagnostics* aDiagnostics) const override {
+    return media::DecodeSupport::SoftwareDecode;
+  }
+};
+
+already_AddRefed<PlatformDecoderModule> CreateNullDecoderModule() {
+  RefPtr<PlatformDecoderModule> pdm = new NullDecoderModule();
+  return pdm.forget();
+}
+
+}  // namespace mozilla