From 8a4f546b85d0887d1d5af0a428753c7d31304b72 Mon Sep 17 00:00:00 2001
From: "Matthias P. Braendli" <matthias.braendli@mpb.li>
Date: Sat, 17 May 2014 17:48:22 +0200
Subject: add non-working PFT layer

---
 src/dabOutput/edi/PFT.cpp | 91 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100644 src/dabOutput/edi/PFT.cpp

(limited to 'src/dabOutput/edi/PFT.cpp')

diff --git a/src/dabOutput/edi/PFT.cpp b/src/dabOutput/edi/PFT.cpp
new file mode 100644
index 0000000..e14a008
--- /dev/null
+++ b/src/dabOutput/edi/PFT.cpp
@@ -0,0 +1,91 @@
+/*
+   Copyright (C) 2013 Matthias P. Braendli
+   http://mpb.li
+
+   EDI output,
+   Protection, Fragmentation and Transport. (PFT)
+
+   Are supported:
+    Reed-Solomon and Fragmentation
+
+   This implements part of PFT as defined ETSI TS 102 821.
+
+   */
+/*
+   This file is part of CRC-DabMux.
+
+   CRC-DabMux 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.
+
+   CRC-DabMux 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 CRC-DabMux.  If not, see <http://www.gnu.org/licenses/>.
+   */
+
+#include "config.h"
+#include <vector>
+#include <list>
+#include <stdint.h>
+#include "PFT.h"
+#include "ReedSolomon.h"
+
+using namespace std;
+
+typedef vector<uint8_t> Chunk;
+
+
+RSPacket PFT::Protect(AFPacket af_packet)
+{
+    RSPacket rs_packet;
+
+    m_num_chunks = af_packet.size() / 207 + 1;
+    const size_t zero_pad = m_num_chunks * m_k - af_packet.size();
+
+    // add zero padding to last chunk
+    for (size_t i = 0; i < zero_pad; i++) {
+        af_packet.push_back(0);
+    }
+
+    for (size_t i = 1; i < af_packet.size(); i+= m_k) {
+        // add new chunk to the list
+        Chunk c(m_k + ParityBytes);
+
+        for (size_t j = 0; j < m_k; j++) {
+            c[j] = af_packet[i+j];
+        }
+
+        // calculate RS for chunk
+        m_encoder.encode(&c.front(), c.size());
+
+        rs_packet.insert(rs_packet.end(), c.begin(), c.end());
+    }
+
+    return rs_packet;
+}
+
+vector< vector<uint8_t> > PFT::ProtectAndFragment(AFPacket af_packet)
+{
+    RSPacket rs_packet = Protect(af_packet);
+
+    const size_t max_payload_size = ( m_num_chunks * ParityBytes ) / (m_m + 1);
+
+    const size_t fragment_size = m_num_chunks * (m_k + ParityBytes) / max_payload_size;
+    const size_t num_fragments = m_num_chunks * (m_k + ParityBytes) / fragment_size;
+
+    vector< vector<uint8_t> > fragments(num_fragments);
+
+    for (size_t i = 0; i < num_fragments; i++) {
+        for (size_t j = 0; j < fragment_size; j++) {
+            fragments[i][j] = rs_packet[j*num_fragments + i]; //TODO that's wrong. fix it.
+        }
+    }
+
+    return fragments;
+}
+
-- 
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