Haxe Lib Datachannel

lib/datachannel/cpp/libdatachannel/include/rtc/video_layers_allocation.hpp

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+/**
+ * Copyright (c) 2026
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef RTC_VIDEO_LAYERS_ALLOCATION_H
+#define RTC_VIDEO_LAYERS_ALLOCATION_H
+
+#if RTC_ENABLE_MEDIA
+
+#include "common.hpp"
+
+#include <cstdint>
+#include <memory>
+#include <vector>
+
+namespace rtc {
+
+// Google Video Layers Allocation for simulcast
+//
+// https://webrtc.googlesource.com/src/+/refs/heads/main/docs/native-code/rtp-hdrext/video-layers-allocation00
+
+struct RTC_CPP_EXPORT VideoLayersAllocation {
+	struct SpatialLayer {
+		uint16_t width = 0;
+		uint16_t height = 0;
+		uint8_t fps = 0;
+		std::vector<uint32_t> targetBitratesKbps;  // per temporal layer, cumulative, cannot be empty
+	};
+
+	struct RtpStream {
+		std::vector<SpatialLayer> spatialLayers;
+	};
+
+	std::vector<RtpStream> rtpStreams;  // up to 4 streams
+
+	/// Generate the wire format for Google Video Layers Allocation RTP header extension
+	/// @param streamIndex The RTP stream index (0-3) for this packet's stream
+	/// @return Binary payload for the RTP header extension, empty if allocation is invalid
+	binary generate(uint8_t streamIndex) const;
+};
+
+} // namespace rtc
+
+#endif /* RTC_ENABLE_MEDIA */
+
+#endif /* RTC_VIDEO_LAYERS_ALLOCATION_H */