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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) 2014
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/>.
*/
#ifndef TIMESTAMP_DECODER_H
#define TIMESTAMP_DECODER_H
#include <queue>
#include <string>
#include <time.h>
#include <math.h>
#include <stdio.h>
#include "Eti.h"
#include "Log.h"
struct modulator_offset_config
{
bool use_offset_fixed;
double offset_fixed;
/* These two fields are used when the modulator is run with a fixed offset */
bool use_offset_file;
std::string offset_filename;
/* These two fields are used when the modulator reads the offset from a file */
unsigned delay_calculation_pipeline_stages;
/* Specifies by how many stages the timestamp must be delayed.
* (e.g. The FIRFilter is pipelined, therefore we must increase
* delay_calculation_pipeline_stages by one if the filter is used
*/
};
struct frame_timestamp
{
// Which frame count does this timestamp apply to
uint32_t fct;
uint32_t timestamp_sec;
double timestamp_pps_offset;
bool timestamp_valid;
bool timestamp_refresh;
struct frame_timestamp operator=(const struct frame_timestamp &rhs)
{
if (this != &rhs) {
this->timestamp_sec = rhs.timestamp_sec;
this->timestamp_pps_offset = rhs.timestamp_pps_offset;
this->timestamp_valid = rhs.timestamp_valid;
this->timestamp_refresh = rhs.timestamp_refresh;
this->fct = rhs.fct;
}
return *this;
}
struct frame_timestamp& operator+=(const double& diff)
{
double offset_pps, offset_secs;
offset_pps = modf(diff, &offset_secs);
this->timestamp_sec += lrintf(offset_secs);
this->timestamp_pps_offset += offset_pps;
while (this->timestamp_pps_offset > 1)
{
this->timestamp_pps_offset -= 1.0;
this->timestamp_sec += 1;
};
return *this;
}
const struct frame_timestamp operator+(const double diff)
{
struct frame_timestamp ts = *this;
ts += diff;
return ts;
}
void print(const char* t)
{
fprintf(stderr,
"%s <struct frame_timestamp(%s, %d, %.9f)>\n",
t, this->timestamp_valid ? "valid" : "invalid",
this->timestamp_sec, this->timestamp_pps_offset);
}
};
/* This module decodes MNSC time information */
class TimestampDecoder
{
public:
TimestampDecoder(
struct modulator_offset_config& config,
Logger& logger):
myLogger(logger), modconfig(config)
{
inhibit_second_update = 0;
time_pps = 0.0;
time_secs = 0;
latestFCT = 0;
enableDecode = false;
full_timestamp_received_mnsc = false;
gmtime_r(0, &temp_time);
offset_changed = false;
myLogger.level(info) << "Setting up timestamp decoder with " <<
(modconfig.use_offset_fixed ? "fixed" :
(modconfig.use_offset_file ? "dynamic" : "none")) <<
" offset";
};
/* Calculate the timestamp for the current frame. */
void calculateTimestamp(struct frame_timestamp& ts);
/* Update timestamp data from data in ETI */
void updateTimestampEti(
int framephase,
uint16_t mnsc,
double pps,
uint32_t fct);
/* Update the modulator timestamp offset according to the modconf
*/
bool updateModulatorOffset();
protected:
/* Main program logger */
Logger& myLogger;
/* Push a new MNSC field into the decoder */
void pushMNSCData(int framephase, uint16_t mnsc);
/* Each frame contains the TIST field with the PPS offset.
* For each frame, this function must be called to update
* the timestamp
*/
void updateTimestampPPS(double pps);
/* Update the timestamp when a full set of MNSC data is
* known. This function can be called at most every four
* frames when the data is transferred using the MNSC.
*/
void updateTimestampSeconds(uint32_t secs);
struct tm temp_time;
uint32_t time_secs;
uint32_t latestFCT;
double time_pps;
double timestamp_offset;
int inhibit_second_update;
bool offset_changed;
/* configuration for the offset management */
struct modulator_offset_config& modconfig;
/* When the type or identifier don't match, the decoder must
* be disabled
*/
bool enableDecode;
/* Disable timstamps until full time has been received in mnsc */
bool full_timestamp_received_mnsc;
/* when pipelining, we must shift the calculated timestamps
* through this queue. Otherwise, it would not be possible to
* synchronise two modulators if only one uses (for instance) the
* FIRFilter (1 stage pipeline)
*/
std::queue<struct frame_timestamp*> queue_timestamps;
};
#endif
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