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/*
Copyright (C) 2017
Matthias P. Braendli, matthias.braendli@mpb.li
http://www.opendigitalradio.org
EDI output,
Interleaving of PFT fragments to increase robustness against
burst packet loss.
This is possible because EDI has to assume that fragments may reach
the receiver out of order.
*/
/*
This file is part of the ODR-mmbTools.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "config.h"
#include <vector>
#include <deque>
#include <stdexcept>
#include <cstdint>
#include "Log.h"
#include "PFT.h"
namespace edi {
class Interleaver {
public:
using fragment_vec = std::vector<PFTFragment>;
/* Configure the interleaver to use latency_frames number of AF
* packets for interleaving. Total delay through the interleaver
* will be latency_frames * 24ms
*/
void SetLatency(size_t latency_frames);
/* Move the fragments for an AF Packet into the interleaver and
* return interleaved fragments to be transmitted.
*/
fragment_vec Interleave(fragment_vec &fragments);
private:
size_t m_latency = 0;
size_t m_fragment_count = 0;
size_t m_interleave_offset = 0;
size_t m_stride = 0;
/* Buffer that accumulates enough fragments to interleave */
std::deque<fragment_vec> m_buffer;
/* Buffer that contains fragments that have been interleaved,
* to avoid that the interleaver output is too bursty
*/
std::deque<PFTFragment> m_interleaved_fragments;
};
}
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