1 files changed, 63 insertions, 0 deletions
diff --git a/third_party/libwebrtc/modules/video_coding/codecs/vp8/include/temporal_layers_checker.h b/third_party/libwebrtc/modules/video_coding/codecs/vp8/include/temporal_layers_checker.h
new file mode 100644
index 0000000000..3d1671a676
--- /dev/null
+++ b/third_party/libwebrtc/modules/video_coding/codecs/vp8/include/temporal_layers_checker.h
@@ -0,0 +1,63 @@
+/*
+ *  Copyright (c) 2018 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_CODECS_VP8_INCLUDE_TEMPORAL_LAYERS_CHECKER_H_
+#define MODULES_VIDEO_CODING_CODECS_VP8_INCLUDE_TEMPORAL_LAYERS_CHECKER_H_
+
+#include <stdint.h>
+
+#include <memory>
+
+#include "api/video_codecs/vp8_frame_config.h"
+#include "api/video_codecs/vp8_temporal_layers.h"
+
+namespace webrtc {
+
+// Interface for a class that verifies correctness of temporal layer
+// configurations (dependencies, sync flag, etc).
+// Intended to be used in tests as well as with real apps in debug mode.
+class TemporalLayersChecker {
+ public:
+  explicit TemporalLayersChecker(int num_temporal_layers);
+  virtual ~TemporalLayersChecker() {}
+
+  virtual bool CheckTemporalConfig(bool frame_is_keyframe,
+                                   const Vp8FrameConfig& frame_config);
+
+  static std::unique_ptr<TemporalLayersChecker> CreateTemporalLayersChecker(
+      Vp8TemporalLayersType type,
+      int num_temporal_layers);
+
+ private:
+  struct BufferState {
+    BufferState() : is_keyframe(true), temporal_layer(0), sequence_number(0) {}
+    bool is_keyframe;
+    uint8_t temporal_layer;
+    uint32_t sequence_number;
+  };
+  bool CheckAndUpdateBufferState(BufferState* state,
+                                 bool* need_sync,
+                                 bool frame_is_keyframe,
+                                 uint8_t temporal_layer,
+                                 Vp8FrameConfig::BufferFlags flags,
+                                 uint32_t sequence_number,
+                                 uint32_t* lowest_sequence_referenced);
+  BufferState last_;
+  BufferState arf_;
+  BufferState golden_;
+  int num_temporal_layers_;
+  uint32_t sequence_number_;
+  uint32_t last_sync_sequence_number_;
+  uint32_t last_tl0_sequence_number_;
+};
+
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_CODECS_VP8_INCLUDE_TEMPORAL_LAYERS_CHECKER_H_