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Diffstat (limited to 'src/output/SDR.cpp')
| -rw-r--r-- | src/output/SDR.cpp | 433 |
1 files changed, 433 insertions, 0 deletions
diff --git a/src/output/SDR.cpp b/src/output/SDR.cpp new file mode 100644 index 0000000..ba296de --- /dev/null +++ b/src/output/SDR.cpp @@ -0,0 +1,433 @@ +/* + 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 + */ +/* + 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/>. + */ + +#include "output/SDR.h" + +#include "PcDebug.h" +#include "Log.h" +#include "RemoteControl.h" +#include "Utils.h" + +#include <cmath> +#include <iostream> +#include <assert.h> +#include <stdexcept> +#include <stdio.h> +#include <time.h> +#include <errno.h> +#include <unistd.h> +#include <pthread.h> + +using namespace std; + +namespace Output { + +// Maximum number of frames that can wait in frames +static constexpr size_t FRAMES_MAX_SIZE = 8; + +// If the timestamp is further in the future than +// 100 seconds, abort +static constexpr double TIMESTAMP_ABORT_FUTURE = 100; + +// Add a delay to increase buffers when +// frames are too far in the future +static constexpr double TIMESTAMP_MARGIN_FUTURE = 0.5; + +SDR::SDR(SDRDeviceConfig& config, std::shared_ptr<SDRDevice> device) : + ModOutput(), + RemoteControllable("sdr"), + m_config(config), + m_running(false), + m_device(device) +{ + // muting is remote-controllable + m_config.muting = false; + + time_last_frame.tv_sec = 0; + time_last_frame.tv_nsec = 0; + + m_device_thread = std::thread(&SDR::process_thread_entry, this); + + m_dpd_feedback_server = make_shared<DPDFeedbackServer>( + m_device, + m_config.dpdFeedbackServerPort, + m_config.sampleRate); +} + +SDR::~SDR() +{ + stop(); +} + +void SDR::stop() +{ + m_running.store(false); + + FrameData end_marker; + end_marker.buf.resize(0); + m_queue.push(end_marker); + + if (m_device_thread.joinable()) { + m_device_thread.join(); + } +} + +int SDR::process(Buffer *dataIn) +{ + if (m_device) { + FrameData frame; + frame.buf.resize(dataIn->getLength()); + + const uint8_t* pDataIn = (uint8_t*)dataIn->getData(); + std::copy(pDataIn, pDataIn + dataIn->getLength(), + frame.buf.begin()); + + m_eti_source->calculateTimestamp(frame.ts); + + // TODO check device running + + if (frame.ts.fct == -1) { + etiLog.level(info) << + "SDR output: dropping one frame with invalid FCT"; + } + else { + try { + if (m_dpd_feedback_server) { + m_dpd_feedback_server->set_tx_frame(frame.buf, frame.ts); + } + } + catch (const runtime_error& e) { + etiLog.level(warn) << + "SDR output: Feedback server failed, restarting..."; + + m_dpd_feedback_server = std::make_shared<DPDFeedbackServer>( + m_device, + m_config.dpdFeedbackServerPort, + m_config.sampleRate); + } + + size_t num_frames = m_queue.push_wait_if_full(frame, + FRAMES_MAX_SIZE); + etiLog.log(trace, "SDR,push %zu", num_frames); + } + } + else { + // Ignore frame + } + + return dataIn->getLength(); +} + +void SDR::process_thread_entry() +{ + // Set thread priority to realtime + if (int ret = set_realtime_prio(1)) { + etiLog.level(error) << "Could not set priority for SDR device thread:" << ret; + } + + set_thread_name("sdrdevice"); + + last_tx_time_initialised = false; + + size_t last_num_underflows = 0; + size_t pop_prebuffering = FRAMES_MAX_SIZE; + + m_running.store(true); + + while (m_running.load()) { + struct FrameData frame; + etiLog.log(trace, "SDR,wait"); + m_queue.wait_and_pop(frame, pop_prebuffering); + etiLog.log(trace, "SDR,pop"); + + if (m_running.load() == false or frame.buf.empty()) { + break; + } + + if (m_device) { + handle_frame(frame); + + const auto rs = m_device->get_run_statistics(); + + /* Ensure we fill frames after every underrun and + * at startup to reduce underrun likelihood. */ + if (last_num_underflows < rs.num_underruns) { + pop_prebuffering = FRAMES_MAX_SIZE; + } + else { + pop_prebuffering = 1; + } + + last_num_underflows = rs.num_underruns; + } + + } + + m_running.store(false); + etiLog.level(warn) << "SDR Device thread terminated"; +} + +const char* SDR::name() +{ + if (m_device) { + m_name = "OutputSDR("; + m_name += m_device->device_name(); + m_name += ")"; + } + else { + m_name = "OutputSDR(<no device>)"; + } + return m_name.c_str(); +} + +void SDR::setETISource(EtiSource *etiSource) +{ + m_eti_source = etiSource; +} + +void SDR::sleep_through_frame() +{ + struct timespec now; + if (clock_gettime(CLOCK_MONOTONIC, &now) != 0) { + stringstream ss; + ss << "clock_gettime failure: " << strerror(errno); + throw runtime_error(ss.str()); + } + + if (time_last_frame.tv_sec == 0) { + if (clock_gettime(CLOCK_MONOTONIC, &time_last_frame) != 0) { + stringstream ss; + ss << "clock_gettime failure: " << strerror(errno); + throw runtime_error(ss.str()); + } + } + + long delta_us = timespecdiff_us(time_last_frame, now); + long wait_time_us = transmission_frame_duration_ms(m_config.dabMode); + + if (wait_time_us - delta_us > 0) { + usleep(wait_time_us - delta_us); + } + + time_last_frame.tv_nsec += wait_time_us * 1000; + while (time_last_frame.tv_nsec >= 1000000000L) { + time_last_frame.tv_nsec -= 1000000000L; + time_last_frame.tv_sec++; + } +} + +void SDR::handle_frame(struct FrameData& frame) +{ + // Assumes m_device is valid + + constexpr double tx_timeout = 20.0; + + if (not m_device->is_clk_source_ok()) { + sleep_through_frame(); + return; + } + + double device_time = m_device->get_real_secs(); + bool timestamp_discontinuity = false; + const auto& time_spec = frame.ts; + + if (sourceContainsTimestamp) { + // Tx time from MNSC and TIST + const uint32_t tx_second = frame.ts.timestamp_sec; + const uint32_t tx_pps = frame.ts.timestamp_pps; + + if (not frame.ts.timestamp_valid) { + /* We have not received a full timestamp through + * MNSC. We sleep through the frame. + */ + etiLog.level(info) << + "OutputSDR: Throwing sample " << frame.ts.fct << + " away: incomplete timestamp " << tx_second << + " / " << tx_pps; + return; + } + + if (last_tx_time_initialised) { + const size_t sizeIn = frame.buf.size() / sizeof(complexf); + uint64_t increment = (uint64_t)sizeIn * 16384000ul / + (uint64_t)m_config.sampleRate; + // samps * ticks/s / (samps/s) + // (samps * ticks * s) / (s * samps) + // ticks + + uint32_t expected_sec = last_tx_second + increment / 16384000ul; + uint32_t expected_pps = last_tx_pps + increment % 16384000ul; + + while (expected_pps >= 16384000) { + expected_sec++; + expected_pps -= 16384000; + } + + if (expected_sec != tx_second or expected_pps != tx_pps) { + etiLog.level(warn) << "OutputSDR: timestamp irregularity!" << + std::fixed << + " Expected " << + expected_sec << "+" << (double)expected_pps/16384000.0 << + "(" << expected_pps << ")" << + " Got " << + tx_second << "+" << (double)tx_pps/16384000.0 << + "(" << tx_pps << ")"; + + timestamp_discontinuity = true; + } + } + + last_tx_second = tx_second; + last_tx_pps = tx_pps; + last_tx_time_initialised = true; + + const double pps_offset = tx_pps / 16384000.0; + + etiLog.log(trace, "SDR,tist %f", time_spec.get_real_secs()); + + if (time_spec.get_real_secs() + tx_timeout < device_time) { + etiLog.level(warn) << + "OutputSDR: Timestamp in the past! offset: " << + std::fixed << + time_spec.get_real_secs() - device_time << + " (" << device_time << ")" + " frame " << frame.ts.fct << + ", tx_second " << tx_second << + ", pps " << pps_offset; + return; + } + + if (time_spec.get_real_secs() > device_time + TIMESTAMP_ABORT_FUTURE) { + etiLog.level(error) << + "OutputSDR: Timestamp way too far in the future! offset: " << + std::fixed << + time_spec.get_real_secs() - device_time; + throw std::runtime_error("Timestamp error. Aborted."); + } + } + else { // !sourceContainsTimestamp + if (m_config.muting or m_config.muteNoTimestamps) { + /* There was some error decoding the timestamp */ + if (m_config.muting) { + etiLog.log(info, + "OutputSDR: Muting sample %d requested\n", + frame.ts.fct); + } + else { + etiLog.log(info, + "OutputSDR: Muting sample %d : no timestamp\n", + frame.ts.fct); + } + return; + } + } + + if (timestamp_discontinuity) { + frame.ts.timestamp_refresh = true; + } + m_device->transmit_frame(frame); +} + +// ======================================= +// Remote Control +// ======================================= +void SDR::set_parameter(const string& parameter, const string& value) +{ + stringstream ss(value); + ss.exceptions ( stringstream::failbit | stringstream::badbit ); + + if (parameter == "txgain") { + ss >> m_config.txgain; + m_device->set_txgain(m_config.txgain); + } + else if (parameter == "rxgain") { + ss >> m_config.rxgain; + // TODO myUsrp->set_rx_gain(m_config.rxgain); + throw ParameterError("Parameter " + parameter + " is TODO."); + } + else if (parameter == "freq") { + ss >> m_config.frequency; + m_device->tune(m_config.lo_offset, m_config.frequency); + m_config.frequency = m_device->get_tx_freq(); + } + else if (parameter == "muting") { + ss >> m_config.muting; + } + else if (parameter == "underruns" or + parameter == "latepackets" or + parameter == "frames") { + throw ParameterError("Parameter " + parameter + " is read-only."); + } + else { + stringstream ss_err; + ss_err << "Parameter '" << parameter + << "' is not exported by controllable " << get_rc_name(); + throw ParameterError(ss_err.str()); + } +} + +const string SDR::get_parameter(const string& parameter) const +{ + stringstream ss; + if (parameter == "txgain") { + ss << m_config.txgain; + } + else if (parameter == "rxgain") { + ss << m_config.rxgain; + } + else if (parameter == "freq") { + ss << m_config.frequency; + } + else if (parameter == "muting") { + ss << m_config.muting; + } + else if (parameter == "underruns" or + parameter == "latepackets" or + parameter == "frames" ) { + if (not m_device) { + throw ParameterError("OutputSDR has no device"); + } + const auto stat = m_device->get_run_statistics(); + + if (parameter == "underruns") { + ss << stat.num_underruns; + } + else if (parameter == "latepackets") { + ss << stat.num_late_packets; + } + else if (parameter == "frames") { + ss << stat.num_frames_modulated; + } + } + else { + ss << "Parameter '" << parameter << + "' is not exported by controllable " << get_rc_name(); + throw ParameterError(ss.str()); + } + return ss.str(); +} + +} // namespace Output |