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+/*
+ *  Copyright (c) 2019 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 API_TEST_CREATE_FRAME_GENERATOR_H_
+#define API_TEST_CREATE_FRAME_GENERATOR_H_
+
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "absl/types/optional.h"
+#include "api/test/frame_generator_interface.h"
+#include "system_wrappers/include/clock.h"
+
+namespace webrtc {
+namespace test {
+
+// Creates a frame generator that produces frames with small squares that
+// move randomly towards the lower right corner.
+// `type` has the default value FrameGeneratorInterface::OutputType::I420.
+// `num_squares` has the default value 10.
+std::unique_ptr<FrameGeneratorInterface> CreateSquareFrameGenerator(
+    int width,
+    int height,
+    absl::optional<FrameGeneratorInterface::OutputType> type,
+    absl::optional<int> num_squares);
+
+// Creates a frame generator that repeatedly plays a set of yuv files.
+// The frame_repeat_count determines how many times each frame is shown,
+// with 1 = show each frame once, etc.
+std::unique_ptr<FrameGeneratorInterface> CreateFromYuvFileFrameGenerator(
+    std::vector<std::string> filenames,
+    size_t width,
+    size_t height,
+    int frame_repeat_count);
+
+// Creates a frame generator that repeatedly plays a set of nv12 files.
+// The frame_repeat_count determines how many times each frame is shown,
+// with 1 = show each frame once, etc.
+std::unique_ptr<FrameGeneratorInterface> CreateFromNV12FileFrameGenerator(
+    std::vector<std::string> filenames,
+    size_t width,
+    size_t height,
+    int frame_repeat_count = 1);
+
+// Creates a frame generator that repeatedly plays an ivf file.
+std::unique_ptr<FrameGeneratorInterface> CreateFromIvfFileFrameGenerator(
+    std::string filename);
+
+// Creates a frame generator which takes a set of yuv files (wrapping a
+// frame generator created by CreateFromYuvFile() above), but outputs frames
+// that have been cropped to specified resolution: source_width/source_height
+// is the size of the source images, target_width/target_height is the size of
+// the cropped output. For each source image read, the cropped viewport will
+// be scrolled top to bottom/left to right for scroll_tim_ms milliseconds.
+// After that the image will stay in place for pause_time_ms milliseconds,
+// and then this will be repeated with the next file from the input set.
+std::unique_ptr<FrameGeneratorInterface>
+CreateScrollingInputFromYuvFilesFrameGenerator(
+    Clock* clock,
+    std::vector<std::string> filenames,
+    size_t source_width,
+    size_t source_height,
+    size_t target_width,
+    size_t target_height,
+    int64_t scroll_time_ms,
+    int64_t pause_time_ms);
+
+// Creates a frame generator that produces randomly generated slides. It fills
+// the frames with randomly sized and colored squares.
+// `frame_repeat_count` determines how many times each slide is shown.
+std::unique_ptr<FrameGeneratorInterface>
+CreateSlideFrameGenerator(int width, int height, int frame_repeat_count);
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // API_TEST_CREATE_FRAME_GENERATOR_H_