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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-08-19 17:18:51 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-08-19 17:18:51 +0200
commit5ee85c4ac41337e383eb1a735bc05f1e5d46a98f (patch)
tree9a6b4e9ec0138e282a67ac5d537248af4b067ad5 /lib/edioutput/Interleaver.h
parent247b175a6bf8107f0c92e6ca32e11af4b1a47b8a (diff)
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Use EDI output from odr-mmbtools-common
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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;
+};
+
+}
+