Common b23da85: make PFT per-output configurable

7 files changed, 296 insertions, 204 deletions

diff --git a/doc/advanced.mux b/doc/advanced.mux
index c07a2b2..0fc1b53 100644
--- a/doc/advanced.mux
+++ b/doc/advanced.mux
@@ -438,6 +438,10 @@ outputs {
                 destination "192.168.23.23"
                 port        12000
 
+                enable_pft  true
+                fec         1
+                verbose     true
+
                 ; For compatibility: if port is not specified in the destination itself,
                 ; it is taken from the parent 'destinations' block.
             }
@@ -452,6 +456,8 @@ outputs {
                 ; The multicast TTL has to be adapted according to your network
                 ttl 1
 
+                enable_pft  true
+                fec         1
             }
             example_tcp {
                 ; example for EDI TCP server. TCP is reliable, so it is counterproductive to
@@ -469,7 +475,8 @@ outputs {
             }
         }
 
-        ; The settings below apply to all destinations
+        ; The settings below apply to all destinations, unless they are overridden
+        ; inside a destination
 
         ; Enable the PFT subsystem. If false, AFPackets are sent.
         ; PFT is not necessary when using TCP.
diff --git a/lib/edioutput/EDIConfig.h b/lib/edioutput/EDIConfig.h
index 1997210..7016e87 100644
--- a/lib/edioutput/EDIConfig.h
+++ b/lib/edioutput/EDIConfig.h
@@ -1,5 +1,5 @@
 /*
-   Copyright (C) 2019
+   Copyright (C) 2025
    Matthias P. Braendli, matthias.braendli@mpb.li
 
     http://www.opendigitalradio.org
@@ -36,17 +36,31 @@ namespace edi {
 
 /** Configuration for EDI output */
 
+struct pft_settings_t {
+    // protection and fragmentation settings
+    bool verbose       = false;
+    bool enable_pft    = false;
+    unsigned chunk_len = 207;        // RSk, data length of each chunk
+    unsigned fec       = 0;          // number of fragments that can be recovered
+    double fragment_spreading_factor = 0.95;
+    // Spread transmission of fragments in time. 1.0 = 100% means spreading over the whole duration of a frame (24ms)
+    // Above 100% means that the fragments are spread over several 24ms periods, interleaving the AF packets.
+};
+
 struct destination_t {
     virtual ~destination_t() {};
+
+    pft_settings_t pft_settings = {};
 };
 
+
 // Can represent both unicast and multicast destinations
 struct udp_destination_t : public destination_t {
     std::string dest_addr;
-    unsigned int dest_port = 0;
+    uint16_t dest_port = 0;
     std::string source_addr;
-    unsigned int source_port = 0;
-    unsigned int ttl = 10;
+    uint16_t source_port = 0;
+    uint8_t ttl = 10;
 };
 
 // TCP server that can accept multiple connections
@@ -66,16 +80,9 @@ struct tcp_client_t : public destination_t {
 };
 
 struct configuration_t {
-    unsigned chunk_len = 207;        // RSk, data length of each chunk
-    unsigned fec       = 0;          // number of fragments that can be recovered
-    bool dump          = false;      // dump a file with the EDI packets
-    bool verbose       = false;
-    bool enable_pft    = false;      // Enable protection and fragmentation
+    bool verbose = false;
     unsigned int tagpacket_alignment = 0;
     std::vector<std::shared_ptr<destination_t> > destinations;
-    double fragment_spreading_factor = 0.95;
-    // Spread transmission of fragments in time. 1.0 = 100% means spreading over the whole duration of a frame (24ms)
-    // Above 100% means that the fragments are spread over several 24ms periods, interleaving the AF packets.
 
     bool enabled() const { return destinations.size() > 0; }
 
diff --git a/lib/edioutput/PFT.cpp b/lib/edioutput/PFT.cpp
index 7e0e8e9..f65fd67 100644
--- a/lib/edioutput/PFT.cpp
+++ b/lib/edioutput/PFT.cpp
@@ -1,5 +1,5 @@
 /*
-   Copyright (C) 2021
+   Copyright (C) 2025
    Matthias P. Braendli, matthias.braendli@mpb.li
 
     http://www.opendigitalradio.org
@@ -31,7 +31,6 @@
  */
 
 #include <vector>
-#include <list>
 #include <cstdio>
 #include <cstring>
 #include <cstdint>
@@ -41,6 +40,7 @@
 #include "PFT.h"
 #include "crc.h"
 #include "ReedSolomon.h"
+#include "Log.h"
 
 namespace edi {
 
@@ -51,11 +51,10 @@ using namespace std;
 
 PFT::PFT() { }
 
-PFT::PFT(const configuration_t &conf) :
+PFT::PFT(const pft_settings_t& conf) :
+    m_enabled(conf.enable_pft),
     m_k(conf.chunk_len),
     m_m(conf.fec),
-    m_pseq(0),
-    m_num_chunks(0),
     m_verbose(conf.verbose)
     {
         if (m_k > 207) {
@@ -324,5 +323,4 @@ void PFT::OverridePSeq(uint16_t pseq)
     m_pseq = pseq;
 }
 
-}
-
+} // namespace edi
diff --git a/lib/edioutput/PFT.h b/lib/edioutput/PFT.h
index 42569a0..52e9f46 100644
--- a/lib/edioutput/PFT.h
+++ b/lib/edioutput/PFT.h
@@ -1,5 +1,5 @@
 /*
-   Copyright (C) 2021
+   Copyright (C) 2025
    Matthias P. Braendli, matthias.braendli@mpb.li
 
     http://www.opendigitalradio.org
@@ -33,12 +33,8 @@
 #pragma once
 
 #include <vector>
-#include <list>
-#include <stdexcept>
 #include <cstdint>
 #include "AFPacket.h"
-#include "Log.h"
-#include "ReedSolomon.h"
 #include "EDIConfig.h"
 
 namespace edi {
@@ -52,21 +48,24 @@ class PFT
         static constexpr int PARITYBYTES = 48;
 
         PFT();
-        PFT(const configuration_t& conf);
+        PFT(const pft_settings_t& conf);
+
+        bool is_enabled() const { return m_enabled and m_k > 0; }
 
         // return a list of PFT fragments with the correct
         // PFT headers
-        std::vector< PFTFragment > Assemble(AFPacket af_packet);
+        std::vector<PFTFragment> Assemble(AFPacket af_packet);
 
         // Apply Reed-Solomon FEC to the AF Packet
         RSBlock Protect(AFPacket af_packet);
 
         // Cut a RSBlock into several fragments that can be transmitted
-        std::vector< std::vector<uint8_t> > ProtectAndFragment(AFPacket af_packet);
+        std::vector<std::vector<uint8_t>> ProtectAndFragment(AFPacket af_packet);
 
         void OverridePSeq(uint16_t pseq);
 
     private:
+        bool m_enabled = false;
         unsigned int m_k = 207; // length of RS data word
         unsigned int m_m = 3; // number of fragments that can be recovered if lost
         uint16_t m_pseq = 0;
diff --git a/lib/edioutput/Transport.cpp b/lib/edioutput/Transport.cpp
index a5e0bc3..e9559b5 100644
--- a/lib/edioutput/Transport.cpp
+++ b/lib/edioutput/Transport.cpp
@@ -25,7 +25,7 @@
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 #include "Transport.h"
-#include <iterator>
+#include "Log.h"
 #include <cmath>
 #include <thread>
 
@@ -57,13 +57,18 @@ void configuration_t::print() const
         else {
             throw logic_error("EDI destination not implemented");
         }
+        etiLog.level(info) << "  PFT=" << edi_dest->pft_settings.enable_pft;
+        if (edi_dest->pft_settings.enable_pft) {
+            etiLog.level(info) << "  FEC=" << edi_dest->pft_settings.fec;
+            etiLog.level(info) << "  Chunk Len=" << edi_dest->pft_settings.chunk_len;
+            etiLog.level(info) << "  Fragment spreading factor=" << edi_dest->pft_settings.fragment_spreading_factor;
+        }
     }
 }
 
 
 Sender::Sender(const configuration_t& conf) :
-    m_conf(conf),
-    edi_pft(m_conf)
+    m_conf(conf)
 {
     if (m_conf.verbose) {
         etiLog.level(info) << "Setup EDI Output";
@@ -71,37 +76,39 @@ Sender::Sender(const configuration_t& conf) :
 
     for (const auto& edi_dest : m_conf.destinations) {
         if (const auto udp_dest = dynamic_pointer_cast<edi::udp_destination_t>(edi_dest)) {
-            auto udp_socket = std::make_shared<Socket::UDPSocket>(udp_dest->source_port);
+            Socket::UDPSocket udp_socket(udp_dest->source_port);
 
             if (not udp_dest->source_addr.empty()) {
-                udp_socket->setMulticastSource(udp_dest->source_addr.c_str());
-                udp_socket->setMulticastTTL(udp_dest->ttl);
+                udp_socket.setMulticastSource(udp_dest->source_addr.c_str());
+                udp_socket.setMulticastTTL(udp_dest->ttl);
             }
 
-            udp_sockets.emplace(udp_dest.get(), udp_socket);
+            auto sender = make_shared<udp_sender_t>(
+                    udp_dest->dest_addr,
+                    udp_dest->dest_port,
+                    std::move(udp_socket));
+            m_pft_spreaders.emplace_back(
+                make_shared<PFTSpreader>(udp_dest->pft_settings, sender));
         }
         else if (auto tcp_dest = dynamic_pointer_cast<edi::tcp_server_t>(edi_dest)) {
-            auto dispatcher = make_shared<Socket::TCPDataDispatcher>(
-                    tcp_dest->max_frames_queued, tcp_dest->tcp_server_preroll_buffers);
-
-            dispatcher->start(tcp_dest->listen_port, "0.0.0.0");
-            tcp_dispatchers.emplace(tcp_dest.get(), dispatcher);
+            auto sender = make_shared<tcp_dispatcher_t>(
+                    tcp_dest->listen_port,
+                    tcp_dest->max_frames_queued,
+                    tcp_dest->tcp_server_preroll_buffers);
+            m_pft_spreaders.emplace_back(
+                    make_shared<PFTSpreader>(tcp_dest->pft_settings, sender));
         }
         else if (auto tcp_dest = dynamic_pointer_cast<edi::tcp_client_t>(edi_dest)) {
-            auto tcp_send_client = make_shared<Socket::TCPSendClient>(tcp_dest->dest_addr, tcp_dest->dest_port);
-            tcp_senders.emplace(tcp_dest.get(), tcp_send_client);
+            auto sender = make_shared<tcp_send_client_t>(tcp_dest->dest_addr, tcp_dest->dest_port);
+            m_pft_spreaders.emplace_back(
+                    make_shared<PFTSpreader>(tcp_dest->pft_settings, sender));
         }
         else {
             throw logic_error("EDI destination not implemented");
         }
     }
 
-    if (m_conf.dump) {
-        edi_debug_file.open("./edi.debug");
-    }
-
-    if (m_conf.enable_pft) {
-        unique_lock<mutex> lock(m_mutex);
+    {
         m_running = true;
         m_thread = thread(&Sender::run, this);
     }
@@ -111,10 +118,52 @@ Sender::Sender(const configuration_t& conf) :
     }
 }
 
+void Sender::write(const TagPacket& tagpacket)
+{
+    // Assemble into one AF Packet
+    edi::AFPacket af_packet = edi_af_packetiser.Assemble(tagpacket);
+
+    write(af_packet);
+}
+
+void Sender::write(const AFPacket& af_packet)
+{
+    for (auto& sender : m_pft_spreaders) {
+        sender->send_af_packet(af_packet);
+    }
+}
+
+void Sender::override_af_sequence(uint16_t seq)
+{
+    edi_af_packetiser.OverrideSeq(seq);
+}
+
+void Sender::override_pft_sequence(uint16_t pseq)
+{
+    for (auto& spreader : m_pft_spreaders) {
+        spreader->edi_pft.OverridePSeq(pseq);
+    }
+}
+
+std::vector<Sender::stats_t> Sender::get_tcp_server_stats() const
+{
+    std::vector<Sender::stats_t> stats;
+
+    for (auto& spreader : m_pft_spreaders) {
+        if (auto sender = std::dynamic_pointer_cast<tcp_dispatcher_t>(spreader->sender)) {
+            Sender::stats_t s;
+            s.listen_port = sender->listen_port;
+            s.stats = sender->sock.get_stats();
+            stats.push_back(s);
+        }
+    }
+
+    return stats;
+}
+
 Sender::~Sender()
 {
     {
-        unique_lock<mutex> lock(m_mutex);
         m_running = false;
     }
 
@@ -123,36 +172,89 @@ Sender::~Sender()
     }
 }
 
-void Sender::write(const TagPacket& tagpacket)
+void Sender::run()
 {
-    // Assemble into one AF Packet
-    edi::AFPacket af_packet = edi_afPacketiser.Assemble(tagpacket);
+    while (m_running) {
+        const auto now = chrono::steady_clock::now();
+        for (auto& spreader : m_pft_spreaders) {
+            spreader->tick(now);
+        }
 
-    write(af_packet);
+        this_thread::sleep_for(chrono::microseconds(500));
+    }
 }
 
-void Sender::write(const AFPacket& af_packet)
+
+void Sender::udp_sender_t::send_packet(const std::vector<uint8_t> &frame)
+{
+    Socket::InetAddress addr;
+    addr.resolveUdpDestination(dest_addr, dest_port);
+    sock.send(frame, addr);
+}
+
+void Sender::tcp_dispatcher_t::send_packet(const std::vector<uint8_t> &frame)
+{
+    sock.write(frame);
+}
+
+void Sender::tcp_send_client_t::send_packet(const std::vector<uint8_t> &frame)
+{
+    sock.sendall(frame);
+}
+
+Sender::udp_sender_t::udp_sender_t(std::string dest_addr,
+                                   uint16_t dest_port,
+                                   Socket::UDPSocket&& sock) :
+    dest_addr(dest_addr),
+    dest_port(dest_port),
+    sock(std::move(sock))
+{
+}
+
+Sender::tcp_dispatcher_t::tcp_dispatcher_t(uint16_t listen_port,
+                                           size_t max_frames_queued,
+                                           size_t tcp_server_preroll_buffers) :
+    listen_port(listen_port),
+    sock(max_frames_queued, tcp_server_preroll_buffers)
 {
-    if (m_conf.enable_pft) {
+    sock.start(listen_port, "0.0.0.0");
+}
+
+Sender::tcp_send_client_t::tcp_send_client_t(const std::string &dest_addr,
+                                             uint16_t dest_port) :
+    sock(dest_addr, dest_port)
+{
+}
+
+Sender::PFTSpreader::PFTSpreader(const pft_settings_t& conf, sender_sp sender) :
+    sender(sender),
+    edi_pft(conf)
+{
+}
+
+void Sender::PFTSpreader::send_af_packet(const AFPacket& af_packet)
+{
+    using namespace std::chrono;
+    if (edi_pft.is_enabled()) {
         // Apply PFT layer to AF Packet (Reed Solomon FEC and Fragmentation)
         vector<edi::PFTFragment> edi_fragments = edi_pft.Assemble(af_packet);
 
-        if (m_conf.verbose and m_last_num_pft_fragments != edi_fragments.size()) {
+        if (settings.verbose and last_num_pft_fragments != edi_fragments.size()) {
             etiLog.log(debug, "EDI Output: Number of PFT fragments %zu\n",
                     edi_fragments.size());
-            m_last_num_pft_fragments = edi_fragments.size();
+            last_num_pft_fragments = edi_fragments.size();
         }
 
         /* Spread out the transmission of all fragments over part of the 24ms AF packet duration
          * to reduce the risk of losing a burst of fragments because of congestion. */
-        using namespace std::chrono;
         auto inter_fragment_wait_time = microseconds(1);
         if (edi_fragments.size() > 1) {
-            if (m_conf.fragment_spreading_factor > 0) {
+            if (settings.fragment_spreading_factor > 0) {
                 inter_fragment_wait_time =
-                    microseconds(
-                            llrint(m_conf.fragment_spreading_factor * 24000.0 / edi_fragments.size())
-                            );
+                    microseconds(llrint(
+                                settings.fragment_spreading_factor * 24000.0 /
+                                edi_fragments.size()
+                            ));
             }
         }
 
@@ -162,121 +264,35 @@ void Sender::write(const AFPacket& af_packet)
             auto tp = now;
             unique_lock<mutex> lock(m_mutex);
             for (auto& edi_frag : edi_fragments) {
-                m_pending_frames[tp] = move(edi_frag);
+                m_pending_frames[tp] = std::move(edi_frag);
                 tp += inter_fragment_wait_time;
             }
         }
-
-        // Transmission done in run() function
     }
     else /* PFT disabled */ {
-        // Send over ethernet
-        if (m_conf.dump) {
-            ostream_iterator<uint8_t> debug_iterator(edi_debug_file);
-            copy(af_packet.begin(), af_packet.end(), debug_iterator);
-        }
-
-        for (auto& dest : m_conf.destinations) {
-            if (const auto& udp_dest = dynamic_pointer_cast<edi::udp_destination_t>(dest)) {
-                Socket::InetAddress addr;
-                addr.resolveUdpDestination(udp_dest->dest_addr, udp_dest->dest_port);
-
-                if (af_packet.size() > 1400 and not m_udp_fragmentation_warning_printed) {
-                    fprintf(stderr, "EDI Output: AF packet larger than 1400,"
-                            " consider using PFT to avoid UP fragmentation.\n");
-                    m_udp_fragmentation_warning_printed = true;
-                }
-
-                udp_sockets.at(udp_dest.get())->send(af_packet, addr);
-            }
-            else if (auto tcp_dest = dynamic_pointer_cast<edi::tcp_server_t>(dest)) {
-                tcp_dispatchers.at(tcp_dest.get())->write(af_packet);
-            }
-            else if (auto tcp_dest = dynamic_pointer_cast<edi::tcp_client_t>(dest)) {
-                const auto error_stats = tcp_senders.at(tcp_dest.get())->sendall(af_packet);
-
-                if (m_conf.verbose and error_stats.has_seen_new_errors) {
-                    fprintf(stderr, "TCP output %s:%d has %zu reconnects: most recent error: %s\n",
-                            tcp_dest->dest_addr.c_str(),
-                            tcp_dest->dest_port,
-                            error_stats.num_reconnects,
-                            error_stats.last_error.c_str());
-                }
-            }
-            else {
-                throw logic_error("EDI destination not implemented");
-            }
-        }
+        const auto now = steady_clock::now();
+        unique_lock<mutex> lock(m_mutex);
+        m_pending_frames[now] = std::move(af_packet);
     }
-}
 
-void Sender::override_af_sequence(uint16_t seq)
-{
-    edi_afPacketiser.OverrideSeq(seq);
-}
-
-void Sender::override_pft_sequence(uint16_t pseq)
-{
-    edi_pft.OverridePSeq(pseq);
+    // Actual transmission done in tick() function
 }
 
-std::vector<Sender::stats_t> Sender::get_tcp_server_stats() const
+void Sender::PFTSpreader::tick(const std::chrono::steady_clock::time_point& now)
 {
-    std::vector<Sender::stats_t> stats;
+    unique_lock<mutex> lock(m_mutex);
 
-    for (auto& el : tcp_dispatchers) {
-        Sender::stats_t s;
-        s.listen_port = el.first->listen_port;
-        s.stats = el.second->get_stats();
-        stats.push_back(s);
-    }
-
-    return stats;
-}
+    for (auto it = m_pending_frames.begin(); it != m_pending_frames.end(); ) {
+        const auto& edi_frag = it->second;
 
-void Sender::run()
-{
-    while (m_running) {
-        unique_lock<mutex> lock(m_mutex);
-        const auto now = chrono::steady_clock::now();
-
-        // Send over ethernet
-        for (auto it = m_pending_frames.begin(); it != m_pending_frames.end(); ) {
-            const auto& edi_frag = it->second;
-
-            if (it->first <= now) {
-                if (m_conf.dump) {
-                    ostream_iterator<uint8_t> debug_iterator(edi_debug_file);
-                    copy(edi_frag.begin(), edi_frag.end(), debug_iterator);
-                }
-
-                for (auto& dest : m_conf.destinations) {
-                    if (const auto& udp_dest = dynamic_pointer_cast<edi::udp_destination_t>(dest)) {
-                        Socket::InetAddress addr;
-                        addr.resolveUdpDestination(udp_dest->dest_addr, udp_dest->dest_port);
-
-                        udp_sockets.at(udp_dest.get())->send(edi_frag, addr);
-                    }
-                    else if (auto tcp_dest = dynamic_pointer_cast<edi::tcp_server_t>(dest)) {
-                        tcp_dispatchers.at(tcp_dest.get())->write(edi_frag);
-                    }
-                    else if (auto tcp_dest = dynamic_pointer_cast<edi::tcp_client_t>(dest)) {
-                        tcp_senders.at(tcp_dest.get())->sendall(edi_frag);
-                    }
-                    else {
-                        throw logic_error("EDI destination not implemented");
-                    }
-                }
-                it = m_pending_frames.erase(it);
-            }
-            else {
-                ++it;
-            }
+        if (it->first <= now) {
+            sender->send_packet(edi_frag);
+            it = m_pending_frames.erase(it);
+        }
+        else {
+            ++it;
         }
-
-        lock.unlock();
-        this_thread::sleep_for(chrono::microseconds(500));
     }
 }
 
-}
+} // namespace edi
diff --git a/lib/edioutput/Transport.h b/lib/edioutput/Transport.h
index 2ca638e..b8a9008 100644
--- a/lib/edioutput/Transport.h
+++ b/lib/edioutput/Transport.h
@@ -33,8 +33,6 @@
 #include "Socket.h"
 #include <chrono>
 #include <map>
-#include <unordered_map>
-#include <fstream>
 #include <cstdint>
 #include <thread>
 #include <mutex>
@@ -43,12 +41,13 @@
 namespace edi {
 
 /** ETI/STI sender for EDI output */
-
 class Sender {
     public:
         Sender(const configuration_t& conf);
         Sender(const Sender&) = delete;
-        Sender operator=(const Sender&) = delete;
+        Sender& operator=(const Sender&) = delete;
+        Sender(Sender&&) = delete;
+        Sender& operator=(Sender&&) = delete;
         ~Sender();
 
         // Assemble the tagpacket into an AF packet, and if needed,
@@ -72,32 +71,78 @@ class Sender {
         std::vector<stats_t> get_tcp_server_stats() const;
 
     private:
-        void run();
-
-        bool m_udp_fragmentation_warning_printed = false;
-
         configuration_t m_conf;
-        std::ofstream edi_debug_file;
 
         // The TagPacket will then be placed into an AFPacket
-        edi::AFPacketiser edi_afPacketiser;
+        edi::AFPacketiser edi_af_packetiser;
 
-        // The AF Packet will be protected with reed-solomon and split in fragments
-        edi::PFT edi_pft;
+        // PFT spreading requires sending UDP packets at specific time,
+        // independently of time when write() gets called
+        bool m_running = false;
+        std::thread m_thread;
+        virtual void run();
 
-        std::unordered_map<udp_destination_t*, std::shared_ptr<Socket::UDPSocket>> udp_sockets;
-        std::unordered_map<tcp_server_t*, std::shared_ptr<Socket::TCPDataDispatcher>> tcp_dispatchers;
-        std::unordered_map<tcp_client_t*, std::shared_ptr<Socket::TCPSendClient>> tcp_senders;
 
-        // PFT spreading requires sending UDP packets at specific time, independently of
-        // time when write() gets called
-        std::thread m_thread;
-        std::mutex m_mutex;
-        bool m_running = false;
-        std::map<std::chrono::steady_clock::time_point, edi::PFTFragment> m_pending_frames;
 
-        size_t m_last_num_pft_fragments = 0;
-};
 
-}
 
+        struct i_sender {
+            virtual void send_packet(const std::vector<uint8_t> &frame) = 0;
+            virtual ~i_sender() { }
+        };
+
+        struct udp_sender_t : public i_sender {
+            udp_sender_t(
+                    std::string dest_addr,
+                    uint16_t dest_port,
+                    Socket::UDPSocket&& sock);
+
+            std::string dest_addr;
+            uint16_t dest_port;
+            Socket::UDPSocket sock;
+
+            virtual void send_packet(const std::vector<uint8_t> &frame) override;
+        };
+
+        struct tcp_dispatcher_t : public i_sender {
+            tcp_dispatcher_t(
+                    uint16_t listen_port,
+                    size_t max_frames_queued,
+                    size_t tcp_server_preroll_buffers);
+
+            uint16_t listen_port;
+            Socket::TCPDataDispatcher sock;
+            virtual void send_packet(const std::vector<uint8_t> &frame) override;
+        };
+
+        struct tcp_send_client_t : public i_sender {
+            tcp_send_client_t(
+                    const std::string& dest_addr,
+                    uint16_t dest_port);
+
+            Socket::TCPSendClient sock;
+            virtual void send_packet(const std::vector<uint8_t> &frame) override;
+        };
+
+        class PFTSpreader {
+            public:
+                using sender_sp = std::shared_ptr<i_sender>;
+                PFTSpreader(const pft_settings_t &conf, sender_sp sender);
+                sender_sp sender;
+                edi::PFT edi_pft;
+
+                void send_af_packet(const AFPacket &af_packet);
+                void tick(const std::chrono::steady_clock::time_point& now);
+
+            private:
+                // send_af_packet() and tick() are called from different threads, both
+                // are accessing m_pending_frames
+                std::mutex m_mutex;
+                std::map<std::chrono::steady_clock::time_point, edi::PFTFragment> m_pending_frames;
+                pft_settings_t settings;
+                size_t last_num_pft_fragments = 0;
+        };
+
+        std::vector<std::shared_ptr<PFTSpreader>> m_pft_spreaders;
+};
+}
diff --git a/src/DabMux.cpp b/src/DabMux.cpp
index 1a367da..bf525c1 100644
--- a/src/DabMux.cpp
+++ b/src/DabMux.cpp
@@ -327,6 +327,38 @@ int main(int argc, char *argv[])
             if (outputuid == "edi") {
                 ptree pt_edi = pt_outputs.get_child("edi");
 
+                bool default_enable_pft = pt_edi.get<bool>("enable_pft", false);
+                edi_conf.verbose = pt_edi.get<bool>("verbose", false);
+
+                unsigned int default_fec = pt_edi.get<unsigned int>("fec", 3);
+                unsigned int default_chunk_len = pt_edi.get<unsigned int>("chunk_len", 207);
+
+                auto check_spreading_factor = [](int percent) {
+                    if (percent < 0) {
+                        throw std::runtime_error("EDI output: negative packet_spread value is invalid.");
+                    }
+                    double factor = (double)percent / 100.0;
+                    if (factor > 30000) {
+                        throw std::runtime_error("EDI output: interleaving set for more than 30 seconds!");
+                    }
+                    return factor;
+                };
+
+                double default_spreading_factor = check_spreading_factor(pt_edi.get<int>("packet_spread", 95));
+
+                using pt_t = boost::property_tree::basic_ptree<std::basic_string<char>, std::basic_string<char>>;
+                auto handle_overrides = [&](edi::pft_settings_t& pft_settings, pt_t pt) {
+                    pft_settings.chunk_len = pt.get<unsigned int>("chunk_len", default_chunk_len);
+                    pft_settings.enable_pft = pt.get<bool>("enable_pft", default_enable_pft);
+                    pft_settings.fec = pt.get<unsigned int>("fec", default_fec);
+                    pft_settings.fragment_spreading_factor = default_spreading_factor;
+                    auto override_spread_percent = pt.get_optional<int>("packet_spread");
+                    if (override_spread_percent) {
+                        pft_settings.fragment_spreading_factor = check_spreading_factor(*override_spread_percent);
+                    }
+                    pft_settings.verbose = pt.get<bool>("verbose", edi_conf.verbose);
+                };
+
                 for (auto pt_edi_dest : pt_edi.get_child("destinations")) {
                     const auto proto = pt_edi_dest.second.get<string>("protocol", "udp");
                     if (proto == "udp") {
@@ -346,6 +378,8 @@ int main(int argc, char *argv[])
                             dest->dest_port       = pt_edi.get<unsigned int>("port");
                         }
 
+                        handle_overrides(dest->pft_settings, pt_edi_dest.second);
+
                         edi_conf.destinations.push_back(dest);
                     }
                     else if (proto == "tcp") {
@@ -355,6 +389,8 @@ int main(int argc, char *argv[])
                         double preroll = pt_edi_dest.second.get<double>("preroll-burst", 0.0);
                         dest->tcp_server_preroll_buffers = ceil(preroll / 24e-3);
 
+                        handle_overrides(dest->pft_settings, pt_edi_dest.second);
+
                         edi_conf.destinations.push_back(dest);
                     }
                     else {
@@ -362,22 +398,6 @@ int main(int argc, char *argv[])
                     }
                 }
 
-                edi_conf.dump = pt_edi.get<bool>("dump", false);
-                edi_conf.enable_pft = pt_edi.get<bool>("enable_pft", false);
-                edi_conf.verbose = pt_edi.get<bool>("verbose", false);
-
-                edi_conf.fec = pt_edi.get<unsigned int>("fec", 3);
-                edi_conf.chunk_len = pt_edi.get<unsigned int>("chunk_len", 207);
-
-                int spread_percent = pt_edi.get<int>("packet_spread", 95);
-                if (spread_percent < 0) {
-                    throw std::runtime_error("EDI output: negative packet_spread value is invalid.");
-                }
-                edi_conf.fragment_spreading_factor = (double)spread_percent / 100.0;
-                if (edi_conf.fragment_spreading_factor > 30000) {
-                    throw std::runtime_error("EDI output: interleaving set for more than 30 seconds!");
-                }
-
                 edi_conf.tagpacket_alignment = pt_edi.get<unsigned int>("tagpacket_alignment", 8);
 
                 mux.set_edi_config(edi_conf);