text: /*
   *  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 MODULES_VIDEO_CODING_SVC_SCALABILITY_STRUCTURE_TEST_HELPERS_H_
  #define MODULES_VIDEO_CODING_SVC_SCALABILITY_STRUCTURE_TEST_HELPERS_H_
  
  #include <stdint.h>
  
  #include <vector>
  
  #include "api/array_view.h"
  #include "api/transport/rtp/dependency_descriptor.h"
  #include "api/video/video_bitrate_allocation.h"
  #include "common_video/generic_frame_descriptor/generic_frame_info.h"
  #include "modules/video_coding/chain_diff_calculator.h"
  #include "modules/video_coding/frame_dependencies_calculator.h"
  #include "modules/video_coding/svc/scalable_video_controller.h"
  
  namespace webrtc {
  
  // Creates bitrate allocation with non-zero bitrate for given number of temporal
  // layers for each spatial layer.
  VideoBitrateAllocation EnableTemporalLayers(int s0, int s1 = 0, int s2 = 0);
  
  class ScalabilityStructureWrapper {
   public:
    explicit ScalabilityStructureWrapper(ScalableVideoController& structure)
        : structure_controller_(structure) {}
  
    std::vector<GenericFrameInfo> GenerateFrames(int num_temporal_units) {
      std::vector<GenericFrameInfo> frames;
      GenerateFrames(num_temporal_units, frames);
      return frames;
    }
    void GenerateFrames(int num_temporal_units,
                        std::vector<GenericFrameInfo>& frames);
  
    // Returns false and ADD_FAILUREs for frames with invalid references.
    // In particular validates no frame frame reference to frame before frames[0].
    // In error messages frames are indexed starting with 0.
    bool FrameReferencesAreValid(
        rtc::ArrayView<const GenericFrameInfo> frames) const;
  
   private:
    ScalableVideoController& structure_controller_;
    FrameDependenciesCalculator frame_deps_calculator_;
    ChainDiffCalculator chain_diff_calculator_;
    int64_t frame_id_ = 0;
  };
  
  }  // namespace webrtc
  
  #endif  // MODULES_VIDEO_CODING_SVC_SCALABILITY_STRUCTURE_TEST_HELPERS_H_
  