Move scalability structures from av1 into own subfolder

To make it natural to reuse them for vp9

Bug: webrtc:11999
Change-Id: If2ef7ca16b8be96e0e03bb19211d9f5eb74b2d3d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/188620
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32414}

modules/video_coding/svc/scalability_structure_test_helpers.cc

@@ -0,0 +1,95 @@
+/*
+ *  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.
+ */
+#include "modules/video_coding/svc/scalability_structure_test_helpers.h"
+
+#include <stdint.h>
+
+#include <utility>
+#include <vector>
+
+#include "api/transport/rtp/dependency_descriptor.h"
+#include "api/video/video_bitrate_allocation.h"
+#include "api/video/video_frame_type.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"
+#include "test/gtest.h"
+
+namespace webrtc {
+
+VideoBitrateAllocation EnableTemporalLayers(int s0, int s1, int s2) {
+  VideoBitrateAllocation bitrate;
+  for (int tid = 0; tid < s0; ++tid) {
+    bitrate.SetBitrate(0, tid, 1'000'000);
+  }
+  for (int tid = 0; tid < s1; ++tid) {
+    bitrate.SetBitrate(1, tid, 1'000'000);
+  }
+  for (int tid = 0; tid < s2; ++tid) {
+    bitrate.SetBitrate(2, tid, 1'000'000);
+  }
+  return bitrate;
+}
+
+std::vector<GenericFrameInfo> ScalabilityStructureWrapper::GenerateFrames(
+    int num_temporal_units,
+    bool restart) {
+  std::vector<GenericFrameInfo> frames;
+  for (int i = 0; i < num_temporal_units; ++i) {
+    for (auto& layer_frame : structure_controller_.NextFrameConfig(restart)) {
+      int64_t frame_id = ++frame_id_;
+      bool is_keyframe = layer_frame.IsKeyframe();
+
+      absl::optional<GenericFrameInfo> frame_info =
+          structure_controller_.OnEncodeDone(std::move(layer_frame));
+      EXPECT_TRUE(frame_info.has_value());
+      if (is_keyframe) {
+        chain_diff_calculator_.Reset(frame_info->part_of_chain);
+      }
+      frame_info->chain_diffs =
+          chain_diff_calculator_.From(frame_id, frame_info->part_of_chain);
+      for (int64_t base_frame_id : frame_deps_calculator_.FromBuffersUsage(
+               is_keyframe ? VideoFrameType::kVideoFrameKey
+                           : VideoFrameType::kVideoFrameDelta,
+               frame_id, frame_info->encoder_buffers)) {
+        EXPECT_LT(base_frame_id, frame_id);
+        EXPECT_GE(base_frame_id, 0);
+        frame_info->frame_diffs.push_back(frame_id - base_frame_id);
+      }
+
+      frames.push_back(*std::move(frame_info));
+    }
+    restart = false;
+  }
+
+  if (restart) {
+    buffer_contains_frame_.reset();
+  }
+  for (const GenericFrameInfo& frame : frames) {
+    for (const CodecBufferUsage& buffer_usage : frame.encoder_buffers) {
+      if (buffer_usage.id < 0 || buffer_usage.id >= 8) {
+        ADD_FAILURE() << "Invalid buffer id " << buffer_usage.id
+                      << ". Up to 8 buffers are supported.";
+        continue;
+      }
+      if (buffer_usage.referenced && !buffer_contains_frame_[buffer_usage.id]) {
+        ADD_FAILURE() << "buffer " << buffer_usage.id
+                      << " was reference before updated.";
+      }
+      if (buffer_usage.updated) {
+        buffer_contains_frame_.set(buffer_usage.id);
+      }
+    }
+  }
+
+  return frames;
+}
+
+}  // namespace webrtc