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/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010 Her Majesty the
Queen in Right of Canada (Communications Research Center Canada)
Copyright (C) 2017
Matthias P. Braendli, matthias.braendli@mpb.li
http://opendigitalradio.org
DESCRIPTION:
This presents a TCP socket to an external tool which calculates
a Digital Predistortion model from a short sequence of transmit
samples and corresponding receive samples.
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod 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.
ODR-DabMod 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 ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <thread>
#include <condition_variable>
#include <mutex>
#include <memory>
#include <string>
#include <atomic>
#include "Log.h"
#include "TimestampDecoder.h"
#include "output/SDRDevice.h"
namespace Output {
enum class BurstRequestState {
None, // To pending request
SaveTransmitFrame, // The TX thread has to save an outgoing frame
SaveReceiveFrame, // The RX thread has to save an incoming frame
Acquired, // Both TX and RX frames are ready
};
struct FeedbackBurstRequest {
// All fields in this struct are protected
mutable std::mutex mutex;
std::condition_variable mutex_notification;
BurstRequestState state = BurstRequestState::None;
// In the SaveTransmit states, num_samples complexf samples are saved into
// the vectors
size_t num_samples = 0;
// The timestamp of the first sample of the TX buffers
uint32_t tx_second = 0;
uint32_t tx_pps = 0; // in units of 1/16384000s
// Samples contain complexf, but since our internal representation is uint8_t
// we keep it like that
std::vector<uint8_t> tx_samples;
// The timestamp of the first sample of the RX buffers
uint32_t rx_second = 0;
uint32_t rx_pps = 0;
std::vector<uint8_t> rx_samples; // Also, actually complexf
};
// Serve TX samples and RX feedback samples over a TCP connection
class DPDFeedbackServer {
public:
DPDFeedbackServer(
std::shared_ptr<SDRDevice> device,
uint16_t port, // Set to 0 to disable the Feedbackserver
uint32_t sampleRate);
DPDFeedbackServer(const DPDFeedbackServer& other) = delete;
DPDFeedbackServer& operator=(const DPDFeedbackServer& other) = delete;
~DPDFeedbackServer();
void set_tx_frame(const std::vector<uint8_t> &buf,
const struct frame_timestamp& ts);
private:
// Thread that reacts to burstRequests and receives from the SDR device
void ReceiveBurstThread(void);
// Thread that listens for requests over TCP to get TX and RX feedback
void ServeFeedbackThread(void);
void ServeFeedback(void);
std::thread rx_burst_thread;
std::thread burst_tcp_thread;
FeedbackBurstRequest burstRequest;
std::atomic_bool m_running;
uint16_t m_port = 0;
uint32_t m_sampleRate = 0;
std::shared_ptr<SDRDevice> m_device;
};
} // namespace Output
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