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/*
* Copyright (c) 2019 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_RTP_RTCP_SOURCE_VIDEO_FEC_GENERATOR_H_
#define MODULES_RTP_RTCP_SOURCE_VIDEO_FEC_GENERATOR_H_
#include <cstddef>
#include <cstdint>
#include <memory>
#include <optional>
#include <vector>
#include "api/units/data_rate.h"
#include "modules/include/module_fec_types.h"
#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
#include "modules/rtp_rtcp/source/rtp_packet_to_send.h"
namespace webrtc {
class VideoFecGenerator {
public:
VideoFecGenerator() = default;
virtual ~VideoFecGenerator() = default;
enum class FecType { kFlexFec, kUlpFec };
virtual FecType GetFecType() const = 0;
// Returns the SSRC used for FEC packets (i.e. FlexFec SSRC).
virtual std::optional<uint32_t> FecSsrc() = 0;
// Returns the overhead, in bytes per packet, for FEC (and possibly RED).
virtual size_t MaxPacketOverhead() const = 0;
// Current rate of FEC packets generated, including all RTP-level headers.
virtual DataRate CurrentFecRate() const = 0;
// Set FEC rates, max frames before FEC is sent, and type of FEC masks.
virtual void SetProtectionParameters(
const FecProtectionParams& delta_params,
const FecProtectionParams& key_params) = 0;
// Called on new media packet to be protected. The generator may choose
// to generate FEC packets at this time, if so they will be stored in an
// internal buffer.
virtual void AddPacketAndGenerateFec(const RtpPacketToSend& packet) = 0;
// Get (and remove) and FEC packets pending in the generator. These packets
// will lack sequence numbers, that needs to be set externally.
// TODO(bugs.webrtc.org/11340): Actually FlexFec sets seq#, fix that!
virtual std::vector<std::unique_ptr<RtpPacketToSend>> GetFecPackets() = 0;
// Only called on the VideoSendStream queue, after operation has shut down,
// and only populated if there is an RtpState (e.g. FlexFec).
virtual std::optional<RtpState> GetRtpState() = 0;
};
} // namespace webrtc
#endif // MODULES_RTP_RTCP_SOURCE_VIDEO_FEC_GENERATOR_H_
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