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+/*
+ *  Copyright (c) 2020 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef TEST_MAPPABLE_NATIVE_BUFFER_H_
+#define TEST_MAPPABLE_NATIVE_BUFFER_H_
+
+#include <utility>
+#include <vector>
+
+#include "api/array_view.h"
+#include "api/video/video_frame.h"
+#include "common_video/include/video_frame_buffer.h"
+#include "rtc_base/ref_counted_object.h"
+#include "rtc_base/synchronization/mutex.h"
+
+namespace webrtc {
+namespace test {
+
+class MappableNativeBuffer;
+
+VideoFrame CreateMappableNativeFrame(int64_t ntp_time_ms,
+                                     VideoFrameBuffer::Type mappable_type,
+                                     int width,
+                                     int height);
+
+rtc::scoped_refptr<MappableNativeBuffer> GetMappableNativeBufferFromVideoFrame(
+    const VideoFrame& frame);
+
+// A for-testing native buffer that is scalable and mappable. The contents of
+// the buffer is black and the pixels are created upon mapping. Mapped buffers
+// are stored inside MappableNativeBuffer, allowing tests to verify which
+// resolutions were mapped, e.g. when passing them in to an encoder or other
+// modules.
+class MappableNativeBuffer : public VideoFrameBuffer {
+ public:
+  // If `allow_i420_conversion` is false, calling ToI420() on a non-I420 buffer
+  // will DCHECK-crash. Used to ensure zero-copy in tests.
+  MappableNativeBuffer(VideoFrameBuffer::Type mappable_type,
+                       int width,
+                       int height);
+  ~MappableNativeBuffer() override;
+
+  VideoFrameBuffer::Type mappable_type() const { return mappable_type_; }
+
+  VideoFrameBuffer::Type type() const override { return Type::kNative; }
+  int width() const override { return width_; }
+  int height() const override { return height_; }
+
+  rtc::scoped_refptr<VideoFrameBuffer> CropAndScale(int offset_x,
+                                                    int offset_y,
+                                                    int crop_width,
+                                                    int crop_height,
+                                                    int scaled_width,
+                                                    int scaled_height) override;
+
+  rtc::scoped_refptr<I420BufferInterface> ToI420() override;
+  rtc::scoped_refptr<VideoFrameBuffer> GetMappedFrameBuffer(
+      rtc::ArrayView<VideoFrameBuffer::Type> types) override;
+
+  // Gets all the buffers that have been mapped so far, including mappings of
+  // cropped and scaled buffers.
+  std::vector<rtc::scoped_refptr<VideoFrameBuffer>> GetMappedFramedBuffers()
+      const;
+  bool DidConvertToI420() const;
+
+ private:
+  friend class rtc::RefCountedObject<MappableNativeBuffer>;
+
+  class ScaledBuffer : public VideoFrameBuffer {
+   public:
+    ScaledBuffer(rtc::scoped_refptr<MappableNativeBuffer> parent,
+                 int width,
+                 int height);
+    ~ScaledBuffer() override;
+
+    VideoFrameBuffer::Type type() const override { return Type::kNative; }
+    int width() const override { return width_; }
+    int height() const override { return height_; }
+
+    rtc::scoped_refptr<VideoFrameBuffer> CropAndScale(
+        int offset_x,
+        int offset_y,
+        int crop_width,
+        int crop_height,
+        int scaled_width,
+        int scaled_height) override;
+
+    rtc::scoped_refptr<I420BufferInterface> ToI420() override;
+    rtc::scoped_refptr<VideoFrameBuffer> GetMappedFrameBuffer(
+        rtc::ArrayView<VideoFrameBuffer::Type> types) override;
+
+   private:
+    friend class rtc::RefCountedObject<ScaledBuffer>;
+
+    const rtc::scoped_refptr<MappableNativeBuffer> parent_;
+    const int width_;
+    const int height_;
+  };
+
+  rtc::scoped_refptr<ScaledBuffer> FullSizeBuffer();
+  rtc::scoped_refptr<VideoFrameBuffer> GetOrCreateMappedBuffer(int width,
+                                                               int height);
+
+  const VideoFrameBuffer::Type mappable_type_;
+  const int width_;
+  const int height_;
+  mutable Mutex lock_;
+  std::vector<rtc::scoped_refptr<VideoFrameBuffer>> mapped_buffers_
+      RTC_GUARDED_BY(&lock_);
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  //  TEST_MAPPABLE_NATIVE_BUFFER_H_