libdatachannel/include/rtc/av1rtppacketizer.hpp

/**
 * Copyright (c) 2023 Paul-Louis Ageneau
 *
 * 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_AV1_RTP_PACKETIZER_H
#define RTC_AV1_RTP_PACKETIZER_H

#if RTC_ENABLE_MEDIA

#include "mediahandlerrootelement.hpp"
#include "nalunit.hpp"
#include "rtppacketizer.hpp"

namespace rtc {

/// RTP packetization of AV1 payload
class RTC_CPP_EXPORT AV1RtpPacketizer final : public RtpPacketizer, public MediaHandlerRootElement {
	shared_ptr<NalUnits> splitMessage(binary_ptr message);
	const uint16_t maximumFragmentSize;

public:
	/// Default clock rate for AV1 in RTP
	inline static const uint32_t defaultClockRate = 90 * 1000;

	// Define how OBUs are seperated in a AV1 Sample
	enum class Packetization {
		Obu = RTC_OBU_PACKETIZED_OBU,
		TemporalUnit = RTC_OBU_PACKETIZED_TEMPORAL_UNIT,
	};

	/// Constructs AV1 payload packetizer with given RTP configuration.
	/// @note RTP configuration is used in packetization process which may change some configuration
	/// properties such as sequence number.
	/// @param rtpConfig  RTP configuration
	AV1RtpPacketizer(Packetization packetization, shared_ptr<RtpPacketizationConfig> rtpConfig,
	                 uint16_t maximumFragmentSize = NalUnits::defaultMaximumFragmentSize);

	ChainedOutgoingProduct processOutgoingBinaryMessage(ChainedMessagesProduct messages,
	                                                    message_ptr control) override;

private:
	const Packetization packetization;
	std::shared_ptr<binary> sequenceHeader;

	std::vector<shared_ptr<binary>> packetizeObu(binary_ptr message, uint16_t maximumFragmentSize);
};

} // namespace rtc

#endif /* RTC_ENABLE_MEDIA */

#endif /* RTC_AV1_RTP_PACKETIZER_H */