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add ryfi decoder module

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AlexandreRouma 2024-07-24 16:31:29 +02:00
parent 949fde022d
commit 554ba2f596
17 changed files with 1568 additions and 0 deletions
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5
CMakeLists.txt
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@ -48,6 +48,7 @@ option(OPT_BUILD_M17_DECODER "Build the M17 decoder module (Dependencies: codec2
option(OPT_BUILD_METEOR_DEMODULATOR "Build the meteor demodulator module (no dependencies required)" ON) option(OPT_BUILD_METEOR_DEMODULATOR "Build the meteor demodulator module (no dependencies required)" ON)
option(OPT_BUILD_PAGER_DECODER "Build the pager decoder module (no dependencies required)" ON) option(OPT_BUILD_PAGER_DECODER "Build the pager decoder module (no dependencies required)" ON)
option(OPT_BUILD_RADIO "Main audio modulation decoder (AM, FM, SSB, etc...)" ON) option(OPT_BUILD_RADIO "Main audio modulation decoder (AM, FM, SSB, etc...)" ON)
option(OPT_BUILD_RYFI_DECODER "RyFi data link decoder" OFF)
option(OPT_BUILD_WEATHER_SAT_DECODER "Build the HRPT decoder module (no dependencies required)" OFF) option(OPT_BUILD_WEATHER_SAT_DECODER "Build the HRPT decoder module (no dependencies required)" OFF)
# Misc # Misc
@ -260,6 +261,10 @@ if (OPT_BUILD_RADIO)
add_subdirectory("decoder_modules/radio") add_subdirectory("decoder_modules/radio")
endif (OPT_BUILD_RADIO) endif (OPT_BUILD_RADIO)
if (OPT_BUILD_RYFI_DECODER)
add_subdirectory("decoder_modules/ryfi_decoder")
endif (OPT_BUILD_RYFI_DECODER)
if (OPT_BUILD_WEATHER_SAT_DECODER) if (OPT_BUILD_WEATHER_SAT_DECODER)
add_subdirectory("decoder_modules/weather_sat_decoder") add_subdirectory("decoder_modules/weather_sat_decoder")
endif (OPT_BUILD_WEATHER_SAT_DECODER) endif (OPT_BUILD_WEATHER_SAT_DECODER)

8
decoder_modules/ryfi_decoder/CMakeLists.txt Normal file
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@ -0,0 +1,8 @@
cmake_minimum_required(VERSION 3.13)
project(ryfi_decoder)
file(GLOB_RECURSE SRC "src/*.cpp" "src/*.c")
include(${SDRPP_MODULE_CMAKE})
target_include_directories(ryfi_decoder PRIVATE "src/")

139
decoder_modules/ryfi_decoder/src/main.cpp Normal file
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#include <imgui.h>
#include <config.h>
#include <core.h>
#include <gui/style.h>
#include <gui/gui.h>
#include <signal_path/signal_path.h>
#include <module.h>
#include <filesystem>
#include <dsp/routing/splitter.h>
#include <dsp/buffer/reshaper.h>
#include <dsp/sink/handler_sink.h>
#include <gui/widgets/folder_select.h>
#include <gui/widgets/constellation_diagram.h>
#include "ryfi/receiver.h"
#define CONCAT(a, b) ((std::string(a) + b).c_str())
SDRPP_MOD_INFO{
/* Name: */ "ryfi_decoder",
/* Description: */ "RyFi decoder for SDR++",
/* Author: */ "Ryzerth",
/* Version: */ 0, 1, 0,
/* Max instances */ -1
};
#define INPUT_BANDWIDTH 800000
#define INPUT_SAMPLE_RATE 1500000
#define INPUT_BAUDRATE 720000
#define SYMBOL_DIAG_RATE 30
#define SYMBOL_DIAG_COUNT 1024
class RyFiDecoderModule : public ModuleManager::Instance {
public:
RyFiDecoderModule(std::string name) {
this->name = name;
vfo = sigpath::vfoManager.createVFO(name, ImGui::WaterfallVFO::REF_CENTER, 0, INPUT_BANDWIDTH, INPUT_SAMPLE_RATE, INPUT_BANDWIDTH, INPUT_BANDWIDTH, true);
rx.init(vfo->output, INPUT_BAUDRATE, INPUT_SAMPLE_RATE);
reshape.init(rx.softOut, SYMBOL_DIAG_COUNT, (INPUT_BAUDRATE / SYMBOL_DIAG_RATE) - SYMBOL_DIAG_COUNT);
symSink.init(&reshape.out, symSinkHandler, this);
rx.onPacket.bind(&RyFiDecoderModule::packetHandler, this);
rx.start();
reshape.start();
symSink.start();
gui::menu.registerEntry(name, menuHandler, this, this);
}
~RyFiDecoderModule() {
rx.stop();
reshape.stop();
symSink.stop();
sigpath::vfoManager.deleteVFO(vfo);
gui::menu.removeEntry(name);
}
void postInit() {}
void enable() {
double bw = gui::waterfall.getBandwidth();
vfo = sigpath::vfoManager.createVFO(name, ImGui::WaterfallVFO::REF_CENTER, std::clamp<double>(0, -bw / 2.0, bw / 2.0), INPUT_BANDWIDTH, INPUT_SAMPLE_RATE, INPUT_BANDWIDTH, INPUT_BANDWIDTH, true);
rx.setInput(vfo->output);
rx.start();
reshape.start();
symSink.start();
enabled = true;
}
void disable() {
rx.stop();
reshape.stop();
symSink.stop();
sigpath::vfoManager.deleteVFO(vfo);
enabled = false;
}
bool isEnabled() {
return enabled;
}
private:
void packetHandler(ryfi::Packet pkt) {
flog::debug("Got a {} byte packet!", pkt.size());
}
static void menuHandler(void* ctx) {
RyFiDecoderModule* _this = (RyFiDecoderModule*)ctx;
float menuWidth = ImGui::GetContentRegionAvail().x;
if (!_this->enabled) { style::beginDisabled(); }
ImGui::SetNextItemWidth(menuWidth);
_this->constDiagram.draw();
if (!_this->enabled) { style::endDisabled(); }
}
static void symSinkHandler(dsp::complex_t* data, int count, void* ctx) {
RyFiDecoderModule* _this = (RyFiDecoderModule*)ctx;
dsp::complex_t* buf = _this->constDiagram.acquireBuffer();
memcpy(buf, data, 1024 * sizeof(dsp::complex_t));
_this->constDiagram.releaseBuffer();
}
std::string name;
bool enabled = true;
// DSP Chain
VFOManager::VFO* vfo;
ryfi::Receiver rx;
dsp::buffer::Reshaper<dsp::complex_t> reshape;
dsp::sink::Handler<dsp::complex_t> symSink;
ImGui::ConstellationDiagram constDiagram;
};
MOD_EXPORT void _INIT_() {
}
MOD_EXPORT ModuleManager::Instance* _CREATE_INSTANCE_(std::string name) {
return new RyFiDecoderModule(name);
}
MOD_EXPORT void _DELETE_INSTANCE_(void* instance) {
delete (RyFiDecoderModule*)instance;
}
MOD_EXPORT void _END_() {
}

74
decoder_modules/ryfi_decoder/src/ryfi/conv_codec.cpp Normal file
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#include "conv_codec.h"
namespace ryfi {
ConvEncoder::ConvEncoder(dsp::stream<uint8_t>* in) {
// Create the convolutional encoder instance
conv = correct_convolutional_create(2, 7, correct_conv_r12_7_polynomial);
// Init the base class
base_type::init(in);
}
ConvEncoder::~ConvEncoder() {
// Destroy the convolutional encoder instance
correct_convolutional_destroy(conv);
}
int ConvEncoder::encode(const uint8_t* in, uint8_t* out, int count) {
// Run convolutional encoder on the data
return correct_convolutional_encode(conv, in, count, out);
}
int ConvEncoder::run() {
int count = base_type::_in->read();
if (count < 0) { return -1; }
count = encode(base_type::_in->readBuf, base_type::out.writeBuf, count);
base_type::_in->flush();
if (!out.swap(count)) { return -1; }
return count;
}
ConvDecoder::ConvDecoder(dsp::stream<dsp::complex_t>* in) {
// Create the convolutional encoder instance
conv = correct_convolutional_create(2, 7, correct_conv_r12_7_polynomial);
// Allocate the soft symbol buffer
soft = dsp::buffer::alloc<uint8_t>(STREAM_BUFFER_SIZE);
// Init the base class
base_type::init(in);
}
ConvDecoder::~ConvDecoder() {
// Destroy the convolutional encoder instance
correct_convolutional_destroy(conv);
// Free the soft symbol buffer
dsp::buffer::free(soft);
}
int ConvDecoder::decode(const dsp::complex_t* in, uint8_t* out, int count) {
// Convert to uint8
const float* _in = (const float*)in;
count *= 2;
for (int i = 0; i < count; i++) {
soft[i] = std::clamp<int>((_in[i] * 127.0f) + 128.0f, 0, 255);
}
// Run convolutional decoder on the data
return correct_convolutional_decode_soft(conv, soft, count, out);
}
int ConvDecoder::run() {
int count = base_type::_in->read();
if (count < 0) { return -1; }
count = decode(base_type::_in->readBuf, base_type::out.writeBuf, count);
base_type::_in->flush();
if (!out.swap(count)) { return -1; }
return count;
}
}

70
decoder_modules/ryfi_decoder/src/ryfi/conv_codec.h Normal file
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@ -0,0 +1,70 @@
#pragma once
#include <stdint.h>
#include "dsp/processor.h"
extern "C" {
#include "correct.h"
}
namespace ryfi {
/**
* RyFi Convolutional Encoder.
*/
class ConvEncoder : public dsp::Processor<uint8_t, uint8_t> {
using base_type = dsp::Processor<uint8_t, uint8_t>;
public:
/**
* Create a convolutional encoder specifying an input stream.
* @param in Input stream.
*/
ConvEncoder(dsp::stream<uint8_t>* in = NULL);
// Destructor
~ConvEncoder();
/**
* Encode data.
* @param in Input bytes.
* @param out Output bits.
* @param count Number of input bytes.
* @return Number of output bits.
*/
int encode(const uint8_t* in, uint8_t* out, int count);
private:
int run();
correct_convolutional* conv;
};
/**
* RyFi Convolutional Decoder.
*/
class ConvDecoder : public dsp::Processor<dsp::complex_t, uint8_t> {
using base_type = dsp::Processor<dsp::complex_t, uint8_t>;
public:
/**
* Create a convolutional encoder specifying an input stream.
* @param in Input stream.
*/
ConvDecoder(dsp::stream<dsp::complex_t>* in = NULL);
// Destructor
~ConvDecoder();
/**
* Decode soft symbols.
* @param in Input soft symbols.
* @param out Output bytes.
* @param count Number of input bytes.
* @return Number of output bits.
*/
int decode(const dsp::complex_t* in, uint8_t* out, int count);
private:
int run();
correct_convolutional* conv;
uint8_t* soft = NULL;
};
}

37
decoder_modules/ryfi_decoder/src/ryfi/frame.cpp Normal file
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#include "frame.h"
namespace ryfi {
int Frame::serialize(uint8_t* bytes) const {
// Write the counter
bytes[0] = (counter >> 8) & 0xFF;
bytes[1] = counter & 0xFF;
// Write the first packet pointer
bytes[2] = (firstPacket >> 8) & 0xFF;
bytes[3] = firstPacket & 0xFF;
// Write the last packet pointer
bytes[4] = (lastPacket >> 8) & 0xFF;
bytes[5] = lastPacket & 0xFF;
// Write the data
memcpy(&bytes[6], content, FRAME_DATA_SIZE);
// Return the length of a serialized frame
return FRAME_SIZE;
}
void Frame::deserialize(const uint8_t* bytes, Frame& frame) {
// Read the counter
frame.counter = (((uint16_t)bytes[0]) << 8) | ((uint16_t)bytes[1]);
// Read the first packet pointer
frame.firstPacket = (((uint16_t)bytes[2]) << 8) | ((uint16_t)bytes[3]);
// Read the last packet pointer
frame.lastPacket = (((uint16_t)bytes[4]) << 8) | ((uint16_t)bytes[5]);
// Read the data
memcpy(frame.content, &bytes[6], FRAME_DATA_SIZE);
}
}

42
decoder_modules/ryfi_decoder/src/ryfi/frame.h Normal file
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#pragma once
#include <stdint.h>
#include "rs_codec.h"
namespace ryfi {
enum PacketOffset {
PKT_OFFS_NONE = 0xFFFF
};
struct Frame {
/**
* Serialize the frame to bytes.
* @param bytes Buffer to write the serialized frame to.
*/
int serialize(uint8_t* bytes) const;
/**
* Deserialize a frame from bytes.
* @param bytes Buffer to deserialize the frame from.
* @param frame Object that will contain the deserialize frame.
*/
static void deserialize(const uint8_t* bytes, Frame& frame);
// Size of a serialized frame
static inline const int FRAME_SIZE = RS_BLOCK_DEC_SIZE*RS_BLOCK_COUNT;
// Size of the data area of the frame
static inline const int FRAME_DATA_SIZE = FRAME_SIZE - 6;
// Steadily increasing counter.
uint16_t counter = 0;
// Byte offset of the first packet in the frame.
uint16_t firstPacket = 0;
// Byte offset of the last packet in the frame.
uint16_t lastPacket = 0;
// Data area of the frame.
uint8_t content[FRAME_DATA_SIZE];
};
}

137
decoder_modules/ryfi_decoder/src/ryfi/framing.cpp Normal file
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#include "framing.h"
namespace ryfi {
dsp::complex_t QPSK_SYMBOLS[4] = {
{ -0.070710678118f, -0.070710678118f },
{ -0.070710678118f, 0.070710678118f },
{ 0.070710678118f, -0.070710678118f },
{ 0.070710678118f, 0.070710678118f },
};
Framer::Framer(dsp::stream<uint8_t>* in) {
// Generate the sync symbols
int k = 0;
for (int i = 62; i >= 0; i -= 2) {
syncSyms[k++] = QPSK_SYMBOLS[(SYNC_WORD >> i) & 0b11];
}
// Initialize base class
base_type::init(in);
}
int Framer::encode(const uint8_t* in, dsp::complex_t* out, int count) {
// Copy sync symbols
memcpy(out, syncSyms, SYNC_SYMS*sizeof(dsp::complex_t));
// Modulate the rest of the bits
dsp::complex_t* dataOut = &out[SYNC_SYMS];
int dataSyms = count / 2;
for (int i = 0; i < dataSyms; i++) {
uint8_t bits = (in[i >> 2] >> (6 - 2*(i & 0b11))) & 0b11;
dataOut[i] = QPSK_SYMBOLS[bits];
}
// Compute and return the total number of symbols
return SYNC_SYMS + dataSyms;
}
int Framer::run() {
int count = base_type::_in->read();
if (count < 0) { return -1; }
count = encode(base_type::_in->readBuf, base_type::out.writeBuf, count);
base_type::_in->flush();
if (!out.swap(count)) { return -1; }
return count;
}
Deframer::Deframer(dsp::stream<dsp::complex_t> *in) {
// Compute sync word rotations
// 0: 00 01 11 10
// 90: 10 00 01 11
// 180: 11 10 00 01
// 270: 01 11 10 00
// For 0 and 180 it's the sync and its complement
syncRots[ROT_0_DEG] = SYNC_WORD;
syncRots[ROT_180_DEG] = ~SYNC_WORD;
// For 90 and 270 its the quadrature and its complement
uint64_t quad;
for (int i = 62; i >= 0; i -= 2) {
// Get the symbol
uint8_t sym = (SYNC_WORD >> i) & 0b11;
// Rotate it 90 degrees
uint8_t rsym;
switch (sym) {
case 0b00: rsym = 0b10; break;
case 0b01: rsym = 0b00; break;
case 0b11: rsym = 0b01; break;
case 0b10: rsym = 0b11; break;
}
// Push it into the quadrature
quad = (quad << 2) | rsym;
}
syncRots[ROT_90_DEG] = quad;
syncRots[ROT_270_DEG] = ~quad;
base_type::init(in);
}
int Deframer::run() {
int count = base_type::_in->read();
if (count < 0) { return -1; }
dsp::complex_t* in = base_type::_in->readBuf;
for (int i = 0; i < count; i++) {
if (recv) {
// Copy the symbol to the output and rotate it approprieate
base_type::out.writeBuf[outCount++] = in[i] * symRot;
// Check if we're done receiving the frame, send it out
if (!(--recv)) {
if (!base_type::out.swap(outCount)) {
base_type::_in->flush();
return -1;
}
}
}
else {
// Get the raw symbol
dsp::complex_t fsym = in[i];
// Decode the symbol
uint8_t sym = ((fsym.re > 0) ? 0b10 : 0b00) | ((fsym.im > 0) ? 0b01 : 0b00);
// Push it to the shift register
shift = (shift << 2) | sym;
// Find the rotation starting with the last known one
for (int i = 0; i < 4; i++) {
// Get the test rotation
int testRot = (knownRot+i) & 0b11;
// Check if the hamming distance is close enough
int dist;
if (distance(shift, syncRots[testRot]) < 6) {
// Save the new rotation
knownRot = testRot;
// Start reading in symbols for the frame
symRot = symRots[knownRot];
recv = 8168; // TODO: Don't hardcode!
outCount = 0;
}
}
}
}
base_type::_in->flush();
return count;
}
}

86
decoder_modules/ryfi_decoder/src/ryfi/framing.h Normal file
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#pragma once
#include "dsp/processor.h"
#include <stdint.h>
namespace ryfi {
// Synchronization word.
inline const uint64_t SYNC_WORD = 0x341CC540819D8963;
// Number of synchronization bits.
inline const int SYNC_BITS = 64;
// Number of synchronization symbols.
inline const int SYNC_SYMS = SYNC_BITS / 2;
// Possible constellation rotations
enum {
ROT_0_DEG = 0,
ROT_90_DEG = 1,
ROT_180_DEG = 2,
ROT_270_DEG = 3
};
/**
* RyFi Framer.
*/
class Framer : public dsp::Processor<uint8_t, dsp::complex_t> {
using base_type = dsp::Processor<uint8_t, dsp::complex_t>;
public:
/**
* Create a framer specifying an input stream.
* @param in Input stream.
*/
Framer(dsp::stream<uint8_t>* in = NULL);
/**
* Encode a frame to symbols adding a sync word.
*/
int encode(const uint8_t* in, dsp::complex_t* out, int count);
private:
int run();
dsp::complex_t syncSyms[SYNC_SYMS];
};
class Deframer : public dsp::Processor<dsp::complex_t, dsp::complex_t> {
using base_type = dsp::Processor<dsp::complex_t, dsp::complex_t>;
public:
/**
* Create a deframer specifying an input stream.
* @param in Input stream.
*/
Deframer(dsp::stream<dsp::complex_t> *in = NULL);
private:
int run();
inline static constexpr int distance(uint64_t a, uint64_t b) {
int dist = 0;
for (int i = 0; i < 64; i++) {
dist += ((a & 1) != (b & 1));
a >>= 1;
b >>= 1;
}
return dist;
}
// Frame reading counters
int recv = 0;
int outCount = 0;
// Rotation handling
int knownRot = 0;
uint64_t syncRots[4];
dsp::complex_t symRot;
const dsp::complex_t symRots[4] = {
{ 1.0f, 0.0f }, // 0 deg
{ 0.0f, -1.0f }, // 90 deg
{ -1.0f, 0.0f }, // 180 deg
{ 0.0f, 1.0f }, // 270 deg
};
// Shift register
uint64_t shift;
};
}

126
decoder_modules/ryfi_decoder/src/ryfi/packet.cpp Normal file
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#include "packet.h"
#include "string.h"
#include <stdexcept>
namespace ryfi {
Packet::Packet() {}
Packet::Packet(uint8_t* content, int size) {
// Check that the size isn't too large
if (size > MAX_CONTENT_SIZE) {
throw std::runtime_error("Content size is too large to fit in a packet");
}
// Allocate the buffer
allocate(size);
// Copy over the content
memcpy(_content, content, size);
}
Packet::Packet(const Packet& b) {
// Reallocate the buffer
allocate(b._size);
// Copy over the content
memcpy(_content, b._content, b._size);
}
Packet::Packet(Packet&& b) {
// Move members
_content = b._content;
_size = b._size;
// Destroy old object
b._content = NULL;
b._size = 0;
}
Packet::~Packet() {
// Delete the content
if (_content) { delete[] _content; }
}
Packet& Packet::operator=(const Packet& b) {
// Reallocate the buffer
allocate(b._size);
// Copy over the content
memcpy(_content, b._content, b._size);
// Return self
return *this;
}
Packet& Packet::operator=(Packet&& b) {
// Move members
_content = b._content;
_size = b._size;
// Destroy old object
b._content = NULL;
b._size = 0;
// Return self
return *this;
}
Packet::operator bool() const {
return _size > 0;
}
int Packet::size() const {
// Return the size
return _size;
}
const uint8_t* Packet::data() const {
// Return the size
return _content;
}
void Packet::setContent(uint8_t* content, int size) {
// Check that the size isn't too large
if (size > MAX_CONTENT_SIZE) {
throw std::runtime_error("Content size is too large to fit in a packet");
}
// Reallocate the buffer
allocate(size);
// Copy over the content
memcpy(_content, content, size);
}
int Packet::serializedSize() const {
// Two size bytes + Size of the content
return _size + 2;
}
int Packet::serialize(uint8_t* bytes) const {
// Write the size in big-endian
bytes[0] = (_size >> 8) & 0xFF;
bytes[1] = _size & 0xFF;
// Copy the content of the packet
memcpy(&bytes[2], _content, _size);
// Return the serialized size
return serializedSize();
}
void Packet::allocate(int newSize) {
// If the size hasn't changed, do nothing
if (newSize == _size) { return; }
// Free the old buffer
if (_content) { delete[] _content; };
// Update the size
_size = newSize;
// Allocate the buffer
_content = new uint8_t[newSize];
}
}

88
decoder_modules/ryfi_decoder/src/ryfi/packet.h Normal file
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#pragma once
#include <stdint.h>
namespace ryfi {
/**
* RyFi Protocol Packet.
*/
class Packet {
public:
// Default constructor
Packet();
/**
* Create a packet from its content.
* @param content Content of the packet.
* @param size Number of bytes of content.
*/
Packet(uint8_t* content, int size);
// Copy constructor
Packet(const Packet& b);
// Move constructor
Packet(Packet&& b);
// Destructor
~Packet();
// Copy assignment operator
Packet& operator=(const Packet& b);
// Move assignment operator
Packet& operator=(Packet&& b);
// Cast to bool operator
operator bool() const;
/**
* Get the size of the content of the packet.
* @return Size of the content of the packet.
*/
int size() const;
/**
* Get the content of the packet. The pointer is only valid until reallocation or deletion.
* @return Content of the packet.
*/
const uint8_t* data() const;
/**
* Set the content of the packet.
* @param content Content of the packet.
* @param size Number of bytes of content.
*/
void setContent(uint8_t* content, int size);
/**
* Get the size of the serialized packet.
* @return Size of the serialized packet.
*/
int serializedSize() const;
/**
* Serialize the packet to bytes.
* @param bytes Buffer to which to write the serialized packet.
* @return Size of the serialized packet.
*/
int serialize(uint8_t* bytes) const;
/**
* Deserialize a packet from bytes.
* TODO
*/
static bool deserialize(uint8_t* bytes, int size, Packet& pkt);
// Maximum size of the content of the packet.
static inline const int MAX_CONTENT_SIZE = 0xFFFF;
// Maximum size of the serialized packet.
static inline const int MAX_SERIALIZED_SIZE = MAX_CONTENT_SIZE + 2;
private:
void allocate(int newSize);
uint8_t* _content = NULL;
int _size = 0;
};
}

191
decoder_modules/ryfi_decoder/src/ryfi/receiver.cpp Normal file
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#include "receiver.h"
#include "utils/flog.h"
namespace ryfi {
Receiver::Receiver() {}
Receiver::Receiver(dsp::stream<dsp::complex_t>* in, double baudrate, double samplerate) {
init(in, baudrate, samplerate);
}
Receiver::~Receiver() {
// Stop everything
stop();
}
void Receiver::init(dsp::stream<dsp::complex_t>* in, double baudrate, double samplerate) {
// Initialize the DSP
demod.init(in, baudrate, samplerate, 31, 0.6, 0.1f, 0.005f, 1e-6, 0.01);
doubler.init(&demod.out);
softOut = &doubler.outA;
deframer.setInput(&doubler.outB);
conv.setInput(&deframer.out);
rs.setInput(&conv.out);
}
void Receiver::setInput(dsp::stream<dsp::complex_t>* in) {
demod.setInput(in);
}
void Receiver::start() {
// Do nothing if already running
if (running) { return; }
// Start the worker thread
workerThread = std::thread(&Receiver::worker, this);
// Start the DSP
demod.start();
doubler.start();
deframer.start();
conv.start();
rs.start();
// Update the running state
running = true;
}
void Receiver::stop() {
// Do nothing if not running
if (!running) { return; }
// Stop the worker thread
rs.out.stopReader();
if (workerThread.joinable()) { workerThread.join(); }
rs.out.clearReadStop();
// Stop the DSP
demod.stop();
doubler.stop();
deframer.stop();
conv.stop();
rs.stop();
// Update the running state
running = false;
}
void Receiver::worker() {
Frame frame;
uint16_t lastCounter = 0;
uint8_t* pktBuffer = new uint8_t[Packet::MAX_CONTENT_SIZE];
int pktExpected = 0;
int pktRead = 0;
while (true) {
// Read a frame
int count = rs.out.read();
if (count <= 0) { break; }
// Deserialize the frame
Frame::deserialize(rs.out.readBuf, frame);
// Flush the stream
rs.out.flush();
//flog::info("Frame[{}]: FirstPacket={}, LastPacket={}", frame.counter, frame.firstPacket, frame.lastPacket);
// Compute the expected frame counter
uint16_t expectedCounter = lastCounter + 1;
lastCounter = frame.counter;
// If the frames aren't consecutive
int frameRead = 0;
if (frame.counter != expectedCounter) {
//flog::warn("Lost at least {} frames", ((int)frame.counter - (int)expectedCounter + 0x10000) % 0x10000);
// Cancel the partial packet if there was one
pktExpected = 0;
pktRead = 0;
// If this frame is not an idle frame or continuation frame
if (frame.firstPacket != PKT_OFFS_NONE) {
// If the offset of the first packet is not plausible
if (frame.firstPacket > Frame::FRAME_DATA_SIZE-2) {
flog::warn("Packet had non-plausible offset: {}", frameRead);
// Skip the frame
continue;
}
// Skip to the end of the packet
frameRead = frame.firstPacket;
}
}
// If there is no partial packet and the frame doesn't contain a packet start, skip it
if (!pktExpected && frame.firstPacket == PKT_OFFS_NONE) { continue; }
// Extract packets from the frame
bool firstPacket = true;
bool lastPacket = false;
while (frameRead < Frame::FRAME_DATA_SIZE) {
// If there is a partial packet read as much as possible from it
if (pktExpected) {
// Compute how many bytes of the packet are available in the frame
int readable = std::min<int>(pktExpected - pktRead, Frame::FRAME_DATA_SIZE - frameRead);
//flog::debug("Reading {} bytes", readable);
// Write them to the packet
memcpy(&pktBuffer[pktRead], &frame.content[frameRead], readable);
pktRead += readable;
frameRead += readable;
// If the packet is read entirely
if (pktRead >= pktExpected) {
// Create the packet object
Packet pkt(pktBuffer, pktExpected);
// Send off the packet
onPacket(pkt);
// Prepare for the next packet
pktRead = 0;
pktExpected = 0;
// If this was the last packet of the frame
if (lastPacket || frame.firstPacket == PKT_OFFS_NONE) {
// Skip the rest of the frame
frameRead = Frame::FRAME_DATA_SIZE;
continue;
}
}
// Go to next packet
continue;
}
// If the packet offset is not plausible
if (Frame::FRAME_DATA_SIZE - frameRead < 2) {
flog::warn("Packet had non-plausible offset: {}", frameRead);
// Skip the rest of the frame and the packet
frameRead = Frame::FRAME_DATA_SIZE;
pktExpected = 0;
pktRead = 0;
continue;
}
// If this is the first packet, use the frame info to skip possible left over data
if (firstPacket) {
frameRead = frame.firstPacket;
firstPacket = false;
}
// Check if this is the last packet
lastPacket = (frameRead == frame.lastPacket);
// Parse the packet size
pktExpected = ((uint16_t)frame.content[frameRead]) << 8;
pktExpected |= (uint16_t)frame.content[frameRead+1];
//flog::debug("Starting to read a {} byte packet at offset {}", pktExpected, frameRead);
// Skip to the packet content
frameRead += 2;
}
}
delete[] pktBuffer;
}
}

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#pragma once
#include "utils/new_event.h"
#include "dsp/demod/psk.h"
#include "dsp/routing/doubler.h"
#include "packet.h"
#include "frame.h"
#include "rs_codec.h"
#include "conv_codec.h"
#include "framing.h"
#include <mutex>
namespace ryfi {
class Receiver {
public:
Receiver();
/**
* Create a transmitter.
* @param in Baseband input.
* @param baudrate Baudrate to use over the air.
* @param samplerate Samplerate of the baseband.
*/
Receiver(dsp::stream<dsp::complex_t>* in, double baudrate, double samplerate);
/**
* Create a transmitter.
* @param in Baseband input.
* @param baudrate Baudrate to use over the air.
* @param samplerate Samplerate of the baseband.
*/
void init(dsp::stream<dsp::complex_t>* in, double baudrate, double samplerate);
/**
* Set the input stream.
* @param in Baseband input.
*/
void setInput(dsp::stream<dsp::complex_t>* in);
// Destructor
~Receiver();
/**
* Start the transmitter's DSP.
*/
void start();
/**
* Stop the transmitter's DSP.
*/
void stop();
dsp::stream<dsp::complex_t>* softOut;
NewEvent<Packet> onPacket;
private:
void worker();
// DSP
dsp::demod::PSK<4> demod;
dsp::routing::Doubler<dsp::complex_t> doubler;
Deframer deframer;
ConvDecoder conv;
RSDecoder rs;
bool running = false;
std::thread workerThread;
};
}

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#include "rs_codec.h"
namespace ryfi {
RSEncoder::RSEncoder(dsp::stream<uint8_t>* in) {
// Create the convolutional encoder instance
rs = correct_reed_solomon_create(correct_rs_primitive_polynomial_ccsds, 1, 1, 32);
// Init the base class
base_type::init(in);
}
RSEncoder::~RSEncoder() {
// Destroy the convolutional encoder instance
correct_reed_solomon_destroy(rs);
}
int RSEncoder::encode(const uint8_t* in, uint8_t* out, int count) {
// Check the size
assert(count == RS_BLOCK_COUNT*RS_BLOCK_DEC_SIZE);
// Go through each block
uint8_t block[RS_BLOCK_ENC_SIZE];
for (int i = 0; i < RS_BLOCK_COUNT; i++) {
// Encode block
correct_reed_solomon_encode(rs, &in[i*RS_BLOCK_DEC_SIZE], RS_BLOCK_DEC_SIZE, block);
// Interleave into the frame
int k = 0;
for (int j = i; j < RS_BLOCK_ENC_SIZE*RS_BLOCK_COUNT; j += RS_BLOCK_COUNT) {
out[j] = block[k++];
}
}
// Scramble
for (int i = 0; i < RS_BLOCK_COUNT*RS_BLOCK_ENC_SIZE; i++) {
out[i] ^= RS_SCRAMBLER_SEQ[i];
}
return RS_BLOCK_COUNT*RS_BLOCK_ENC_SIZE;
}
int RSEncoder::run() {
int count = base_type::_in->read();
if (count < 0) { return -1; }
count = encode(base_type::_in->readBuf, base_type::out.writeBuf, count);
base_type::_in->flush();
if (!out.swap(count)) { return -1; }
return count;
}
RSDecoder::RSDecoder(dsp::stream<uint8_t>* in) {
// Create the convolutional encoder instance
rs = correct_reed_solomon_create(correct_rs_primitive_polynomial_ccsds, 1, 1, 32);
// Init the base class
base_type::init(in);
}
RSDecoder::~RSDecoder() {
// Destroy the convolutional encoder instance
correct_reed_solomon_destroy(rs);
}
int RSDecoder::decode(uint8_t* in, uint8_t* out, int count) {
// Check the size
assert(count == RS_BLOCK_COUNT*RS_BLOCK_ENC_SIZE);
// Descramble (TODO: Don't do it in-place)
for (int i = 0; i < RS_BLOCK_COUNT*RS_BLOCK_ENC_SIZE; i++) {
in[i] ^= RS_SCRAMBLER_SEQ[i];
}
// Go through each block
uint8_t block[RS_BLOCK_ENC_SIZE];
for (int i = 0; i < RS_BLOCK_COUNT; i++) {
// Deinterleave out of the frame
int k = 0;
for (int j = i; j < count; j += RS_BLOCK_COUNT) {
block[k++] = in[j];
}
// Decode block and return if decoding fails
int res = correct_reed_solomon_decode(rs, block, RS_BLOCK_ENC_SIZE, &out[i*RS_BLOCK_DEC_SIZE]);
if (res < 0) { return 0; }
}
return RS_BLOCK_COUNT*RS_BLOCK_DEC_SIZE;
}
int RSDecoder::run() {
int count = base_type::_in->read();
if (count < 0) { return -1; }
count = decode(base_type::_in->readBuf, base_type::out.writeBuf, count);
base_type::_in->flush();
if (count && !out.swap(count)) { return -1; }
return count;
}
const uint8_t RS_SCRAMBLER_SEQ[RS_BLOCK_ENC_SIZE*RS_BLOCK_COUNT] = {
0x75, 0x05, 0x7C, 0xCE, 0xF1, 0xD0, 0x6C, 0xF6, 0xFA, 0x65, 0xF6, 0xFC, 0xE0, 0x0A, 0x82, 0x17,
0x6C, 0xBE, 0x76, 0xA0, 0xD6, 0x46, 0x12, 0x2E, 0xDE, 0xB5, 0xF7, 0xAD, 0xCB, 0x51, 0x63, 0x47,
0x27, 0x30, 0x7E, 0x43, 0xD1, 0xA1, 0xCB, 0x10, 0x08, 0x49, 0xDF, 0x86, 0xD4, 0xC4, 0xD7, 0x3C,
0x6D, 0x03, 0x07, 0x37, 0x5B, 0xB3, 0xCD, 0x79, 0x6F, 0x1E, 0xBA, 0xC5, 0x6E, 0xC3, 0x8C, 0x7A,
0x25, 0x99, 0x61, 0x54, 0x5A, 0x96, 0x57, 0x9B, 0xE0, 0x60, 0x5B, 0x09, 0x6D, 0x8B, 0x2D, 0x9D,
0x15, 0x9D, 0x0E, 0xBF, 0x57, 0xFB, 0x9C, 0x49, 0x82, 0x2C, 0x48, 0x59, 0x92, 0x47, 0x79, 0x17,
0x16, 0x74, 0xEA, 0xEA, 0xBB, 0xC5, 0x72, 0x32, 0x17, 0xD1, 0xB3, 0xDE, 0xEB, 0x15, 0xC7, 0x55,
0x8A, 0xF2, 0x88, 0xC2, 0x33, 0xA6, 0x17, 0x8B, 0xD4, 0x77, 0x22, 0x00, 0x63, 0x47, 0x45, 0x5F,
0x36, 0x35, 0x58, 0x8B, 0x88, 0xEC, 0xCA, 0xC4, 0x60, 0x53, 0x9E, 0xBD, 0xB2, 0xF5, 0x51, 0x46,
0x34, 0x9A, 0x07, 0x25, 0x3F, 0xF5, 0x65, 0x63, 0x77, 0x3C, 0x5A, 0xFA, 0x4E, 0x0C, 0xF7, 0x1B,
0x82, 0xAB, 0x73, 0x06, 0x7F, 0xB7, 0xC6, 0x6B, 0xBF, 0xB1, 0x46, 0xF3, 0x01, 0x91, 0xB1, 0xFF,
0x5C, 0x6F, 0xF9, 0x43, 0x0E, 0x6A, 0x70, 0x89, 0x0B, 0xEA, 0x8C, 0xD4, 0x1B, 0x51, 0x01, 0x31,
0x71, 0x2E, 0xDF, 0x24, 0xC1, 0xD5, 0xDB, 0x0E, 0xF5, 0xEB, 0x78, 0x79, 0x39, 0x5B, 0xAD, 0xC3,
0xA9, 0xA6, 0x60, 0x30, 0xA2, 0x9A, 0x7B, 0xA0, 0xF4, 0xAA, 0xC5, 0x57, 0xB3, 0x16, 0xF9, 0xB5,
0x79, 0x20, 0xC1, 0x88, 0x9A, 0x00, 0x43, 0xB2, 0xC6, 0x84, 0x8D, 0x03, 0xF2, 0xD8, 0x90, 0x7A,
0x21, 0x37, 0x7E, 0xF7, 0x75, 0xE5, 0xFB, 0xC9, 0xDC, 0xAB, 0x4B, 0xBC, 0x35, 0x38, 0xB9, 0x3A,
0x53, 0x89, 0x7E, 0xD5, 0x94, 0x12, 0x2D, 0x9B, 0x91, 0x90, 0x1D, 0x4D, 0x0E, 0xE0, 0x93, 0xF3,
0xC1, 0xA1, 0x9B, 0x73, 0x27, 0x22, 0x41, 0x27, 0xEE, 0x2A, 0xD7, 0x45, 0xBC, 0x8F, 0x9B, 0xA2,
0x36, 0x11, 0x16, 0x37, 0x1A, 0xF1, 0x2E, 0x71, 0xCF, 0x86, 0x89, 0x83, 0x5A, 0xF1, 0x24, 0x6C,
0x56, 0x71, 0x53, 0xE4, 0xD2, 0xCB, 0xCA, 0x86, 0x1E, 0xA0, 0xD5, 0x83, 0x3B, 0xEF, 0x09, 0x09,
0xC2, 0x07, 0x53, 0x86, 0xE6, 0x8A, 0xC6, 0x70, 0xFB, 0x91, 0x43, 0xCB, 0x91, 0x6E, 0xA9, 0xBC,
0x31, 0x42, 0x61, 0x0C, 0x88, 0xB8, 0x2C, 0xED, 0xD8, 0xE6, 0xA3, 0xEC, 0xAC, 0xB9, 0x45, 0x5E,
0x2C, 0x73, 0x3F, 0x2E, 0x06, 0xE0, 0xBF, 0x73, 0xDD, 0x2E, 0x45, 0x50, 0x6C, 0x53, 0x55, 0xF0,
0x7F, 0x6E, 0x61, 0xFA, 0xA0, 0x7A, 0x1C, 0xF0, 0xBD, 0xAC, 0x48, 0x61, 0x03, 0x6B, 0xED, 0x54,
0x2A, 0x27, 0x94, 0xF6, 0xF9, 0x6A, 0x04, 0x08, 0x0B, 0x3C, 0xC3, 0x30, 0x66, 0x01, 0xFB, 0xDC,
0xC9, 0x65, 0x03, 0x83, 0x7D, 0x0A, 0xDF, 0xA5, 0x04, 0x14, 0xE4, 0xF2, 0x4C, 0x01, 0xDF, 0x04,
0xD2, 0x80, 0xB9, 0x9B, 0xD9, 0x5E, 0xF8, 0x2A, 0x93, 0x8D, 0x8C, 0x09, 0x9B, 0x38, 0xEC, 0x3B,
0xC4, 0x29, 0x90, 0x7C, 0x65, 0x3A, 0xF2, 0x4B, 0x69, 0xD3, 0x63, 0x9B, 0x40, 0x95, 0xC3, 0xFB,
0x67, 0x54, 0x40, 0x9B, 0x26, 0x9F, 0x52, 0xFE, 0xD8, 0xD0, 0x24, 0x9C, 0x5C, 0xD4, 0xEF, 0xDE,
0x28, 0x66, 0x75, 0x04, 0xCB, 0xA4, 0xC0, 0xB9, 0x4B, 0xC9, 0x20, 0x4B, 0x56, 0xC7, 0x86, 0xC5,
0x39, 0x45, 0x18, 0xA7, 0x48, 0x14, 0x1A, 0x51, 0xCA, 0xD0, 0xC0, 0x15, 0xDD, 0xC1, 0x28, 0x4A,
0x7A, 0xD2, 0x10, 0xEA, 0x83, 0xD3, 0x3A, 0xEF, 0x48, 0x29, 0x41, 0xA4, 0xD4, 0x57, 0xA6, 0x1D,
0x76, 0x24, 0x93, 0x58, 0x7E, 0xB7, 0xDD, 0x0B, 0xF2, 0xCE, 0x71, 0x55, 0xF5, 0xAB, 0x8C, 0xC8,
0x70, 0x59, 0x73, 0x69, 0x9D, 0x29, 0x5E, 0x59, 0xF4, 0xB2, 0xC4, 0x97, 0x75, 0xF0, 0x65, 0x1B,
0x66, 0x5F, 0xA4, 0x33, 0x5C, 0xC7, 0xBF, 0x45, 0xE6, 0x20, 0xC0, 0xBD, 0xAD, 0xAE, 0x9F, 0x97,
0x05, 0xD8, 0x04, 0x2B, 0x0A, 0x46, 0xE8, 0xB8, 0xCB, 0x00, 0xE2, 0x7C, 0x70, 0x1B, 0x49, 0xDE,
0x81, 0xEB, 0x24, 0xAC, 0x1B, 0x3E, 0x09, 0xFB, 0xAC, 0xB7, 0xF2, 0xD1, 0xB2, 0x78, 0xF3, 0xAC,
0xC7, 0x6A, 0xA2, 0x07, 0x4C, 0xED, 0x61, 0xAD, 0x04, 0x7F, 0x45, 0x83, 0x59, 0x31, 0x27, 0xF0,
0x16, 0x6B, 0x0C, 0xAA, 0xD4, 0xD1, 0xCB, 0x1C, 0x51, 0x41, 0x0D, 0x2F, 0x8F, 0xF9, 0xF9, 0x7F,
0x22, 0x89, 0x46, 0xF4, 0xB8, 0x93, 0x98, 0x9E, 0x3E, 0x23, 0xF1, 0x6E, 0x64, 0x08, 0xB6, 0xC9,
0x6E, 0x53, 0x53, 0xED, 0xAD, 0x21, 0xCD, 0x1A, 0xF0, 0x45, 0xFC, 0x14, 0x00, 0xEA, 0xF7, 0x42,
0xEE, 0xDA, 0x58, 0x0D, 0x85, 0xBC, 0x74, 0xFB, 0x73, 0x78, 0xB5, 0x5E, 0x5E, 0x6F, 0x6F, 0x7E,
0x39, 0xC2, 0x05, 0x50, 0xDB, 0x3D, 0xB8, 0xF3, 0x8F, 0x80, 0xEC, 0x46, 0x29, 0x39, 0x89, 0xF3,
0x55, 0x9C, 0x6A, 0x5F, 0x7C, 0xD9, 0x7C, 0x13, 0xE4, 0x56, 0x5E, 0xE9, 0x60, 0x19, 0xE2, 0x7D,
0xC4, 0x41, 0x92, 0x8D, 0xDA, 0x21, 0x58, 0x20, 0xE9, 0xA8, 0x4C, 0x16, 0x34, 0x99, 0xAC, 0xB7,
0x30, 0xBD, 0x39, 0x19, 0xAC, 0x9B, 0x4B, 0x27, 0xFA, 0x32, 0xC1, 0x48, 0xA1, 0x80, 0x34, 0x36,
0x1E, 0xFB, 0x92, 0x43, 0x35, 0x72, 0x2D, 0xEF, 0xD2, 0xF2, 0xFC, 0xC2, 0x85, 0xAB, 0x59, 0x40,
0x8D, 0x9D, 0x1A, 0x1F, 0xE2, 0x92, 0x87, 0xA2, 0xF9, 0x2C, 0x78, 0xE4, 0xC3, 0x26, 0x56, 0x07,
0xB3, 0x78, 0xAF, 0x79, 0x3D, 0x88, 0xF4, 0xAD, 0x66, 0x7C, 0x07, 0x58, 0x98, 0x82, 0x1A, 0x26,
0xF7, 0xFD, 0xCE, 0xFF, 0x75, 0xED, 0xAB, 0xBD, 0xAE, 0x6D, 0x5C, 0x28, 0x91, 0xF3, 0xB7, 0x5C,
0x27, 0x05, 0xEC, 0x3B, 0xE3, 0xDD, 0x93, 0x24, 0x7F, 0xAD, 0x14, 0xAA, 0x49, 0x61, 0x8F, 0x96,
0x1F, 0xAA, 0xB2, 0xEE, 0xA8, 0x24, 0x41, 0x7C, 0xDC, 0xF1, 0x28, 0x26, 0xE6, 0x7F, 0x98, 0x20,
0x50, 0x5F, 0x90, 0x21, 0x8A, 0x09, 0x26, 0x59, 0xD0, 0x07, 0x2F, 0xE1, 0x35, 0x4D, 0x0B, 0x20,
0xB2, 0xD5, 0xDD, 0xB5, 0xAC, 0x1B, 0xFE, 0xD9, 0xE3, 0x35, 0xF1, 0xB8, 0x3F, 0x3D, 0xFC, 0x0B,
0x5A, 0x57, 0xA9, 0x92, 0x2B, 0xC8, 0x3E, 0xC2, 0xAA, 0xEF, 0xB9, 0x98, 0x2C, 0xA8, 0xAB, 0xF6,
0xA1, 0xBF, 0xBC, 0x8D, 0x97, 0xA2, 0x74, 0xD9, 0xE5, 0x99, 0x85, 0x81, 0x15, 0xB0, 0xE7, 0x8B,
0x48, 0x86, 0xF4, 0x94, 0x9C, 0x62, 0x82, 0xD1, 0x2C, 0x24, 0x4B, 0xAC, 0x7A, 0xB8, 0x4E, 0x4A,
0xD2, 0xF6, 0xAA, 0xED, 0xE0, 0x9C, 0x98, 0xD2, 0xDF, 0xC1, 0xBC, 0xBF, 0x55, 0x7D, 0x40, 0xB5,
0xDE, 0xD4, 0x25, 0xBB, 0x81, 0xF4, 0x07, 0x1D, 0xE7, 0x3C, 0xB4, 0x62, 0xC9, 0x55, 0x0A, 0x3A,
0xD5, 0xCE, 0x97, 0xED, 0x30, 0x76, 0x76, 0x51, 0xBC, 0x8C, 0xE4, 0x54, 0xBE, 0xB7, 0xB5, 0xCD,
0xF8, 0x76, 0x37, 0x53, 0x2C, 0x9F, 0xE4, 0xC7, 0xEB, 0xF5, 0x8D, 0x23, 0x8A, 0xDA, 0xD1, 0xA9,
0xD8, 0x4C, 0x53, 0xF3, 0x49, 0xA7, 0x1A, 0x5D, 0xE5, 0x03, 0x49, 0x52, 0xD3, 0xE2, 0x1F, 0xA5,
0x35, 0x9C, 0xBB, 0x0B, 0xC7, 0x0D, 0xA4, 0x65, 0x54, 0x8B, 0x39, 0xF1, 0x3B, 0x67, 0x21, 0x71,
0x10, 0xE7, 0x76, 0xC4, 0xA8, 0xC2, 0x9D, 0x93, 0xC6, 0x51, 0xBA, 0x23
};
}

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#pragma once
#include <stdint.h>
#include "dsp/processor.h"
extern "C" {
#include "correct.h"
}
namespace ryfi {
// Size of an encoded reed-solomon block.
inline const int RS_BLOCK_ENC_SIZE = 255;
// Size of a decoded reed-solomon block.
inline const int RS_BLOCK_DEC_SIZE = 223;
// Number of reed-solomon blocks.
inline const int RS_BLOCK_COUNT = 4;
// Scrambler sequence
extern const uint8_t RS_SCRAMBLER_SEQ[RS_BLOCK_ENC_SIZE*RS_BLOCK_COUNT];
/**
* RyFi Reed-Solomon Encoder.
*/
class RSEncoder : public dsp::Processor<uint8_t, uint8_t> {
using base_type = dsp::Processor<uint8_t, uint8_t>;
public:
/**
* Create a reed-solomon encoder specifying an input stream.
* @param in Input stream
*/
RSEncoder(dsp::stream<uint8_t>* in = NULL);
// Destructor
~RSEncoder();
/**
* Encode data.
* @param in Input bytes.
* @param out Output bytes.
* @param count Number of input bytes.
* @return Number of output bytes.
*/
int encode(const uint8_t* in, uint8_t* out, int count);
private:
int run();
correct_reed_solomon* rs;
};
/**
* RyFi Reed-Solomon Decoder.
*/
class RSDecoder : public dsp::Processor<uint8_t, uint8_t> {
using base_type = dsp::Processor<uint8_t, uint8_t>;
public:
/**
* Create a reed-solomon decoder specifying an input stream.
* @param in Input stream
*/
RSDecoder(dsp::stream<uint8_t>* in = NULL);
// Destructor
~RSDecoder();
/**
* Decode data.
* @param in Input bytes.
* @param out Output bytes.
* @param count Number of input bytes.
* @return Number of output bytes.
*/
int decode(uint8_t* in, uint8_t* out, int count);
private:
int run();
correct_reed_solomon* rs;
};
}

177
decoder_modules/ryfi_decoder/src/ryfi/transmitter.cpp Normal file
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#include "transmitter.h"
namespace ryfi {
Transmitter::Transmitter(double baudrate, double samplerate) {
// Initialize the DSP
rs.setInput(&in);
conv.setInput(&rs.out);
framer.setInput(&conv.out);
resamp.init(&framer.out, baudrate, samplerate);
rrcTaps = dsp::taps::rootRaisedCosine<float>(511, 0.6, baudrate, samplerate);
// Normalize the taps
float tot = 0.0f;
for (int i = 0; i < rrcTaps.size; i++) {
tot += rrcTaps.taps[i];
}
for (int i = 0; i < rrcTaps.size; i++) {
rrcTaps.taps[i] /= tot;
}
rrc.init(&resamp.out, rrcTaps);
out = &rrc.out;
}
Transmitter::~Transmitter() {
// Stop everything
stop();
}
void Transmitter::start() {
// Do nothing if already running
if (running) { return; }
// Start the worker thread
workerThread = std::thread(&Transmitter::worker, this);
// Start the DSP
rs.start();
conv.start();
framer.start();
resamp.start();
rrc.start();
// Update the running state
running = true;
}
void Transmitter::stop() {
// Do nothing if not running
if (!running) { return; }
// Stop the worker thread
in.stopWriter();
if (workerThread.joinable()) { workerThread.join(); }
in.clearWriteStop();
// Stop the DSP
rs.stop();
conv.stop();
framer.stop();
resamp.stop();
rrc.stop();
// Update the running state
running = false;
}
bool Transmitter::send(const Packet& pkt) {
// Acquire the packet queue
std::lock_guard<std::mutex> lck(packetsMtx);
// If there are too many packets queued up, drop the packet
if (packets.size() >= MAX_QUEUE_SIZE) { return false; }
// Push the packet onto the queue
packets.push(pkt);
}
bool Transmitter::txFrame(const Frame& frame) {
// Serialize the frame
int count = frame.serialize(in.writeBuf);
// Send it off
return in.swap(count);
}
Packet Transmitter::popPacket() {
// Acquire the packet queue
std::unique_lock<std::mutex> lck(packetsMtx);
// If no packets are available, return empty packet
if (!packets.size()) { return Packet(); }
// Pop the front packet and return it
Packet pkt = packets.front();
packets.pop();
return pkt;
}
void Transmitter::worker() {
Frame frame;
Packet pkt;
uint16_t counter = 0;
int pktToWrite = 0;
int pktWritten = 0;
uint8_t* pktBuffer = new uint8_t[Packet::MAX_SERIALIZED_SIZE];
while (true) {
// Initialize the frame
frame.counter = counter++;
frame.firstPacket = PKT_OFFS_NONE;
frame.lastPacket = PKT_OFFS_NONE;
int frameOffset = 0;
// Fill the frame with as much packet data as possible
while (frameOffset < sizeof(Frame::content)) {
// If there is no packet in the process of being sent
if (!pktWritten) {
// If there is not enough space for the size of the packet
if ((sizeof(Frame::content) - frameOffset) < 2) {
// Fill the rest of the frame with noise and send it
for (int i = frameOffset; i < sizeof(Frame::content); i++) { frame.content[i] = rand(); }
break;
}
// Get the next packet
pkt = popPacket();
// If there was an available packet
if (pkt) {
// Serialize the packet
pktToWrite = pkt.serializedSize();
pkt.serialize(pktBuffer);
}
}
// If none was available
if (!pkt) {
// Fill the rest of the frame with noise and send it
for (int i = frameOffset; i < sizeof(Frame::content); i++) { frame.content[i] = rand(); }
break;
}
// If this is the beginning of the packet
if (!pktWritten) {
//flog::debug("Starting to write a {} byte packet at offset {}", pktToWrite-2, frameOffset);
// If this is the first packet of the frame, update its offset
if (frame.firstPacket == PKT_OFFS_NONE) { frame.firstPacket = frameOffset; }
// Update the last packet pointer
frame.lastPacket = frameOffset;
}
// Compute the amount of data writeable to the frame
int writeable = std::min<int>(pktToWrite - pktWritten, sizeof(Frame::content) - frameOffset);
// Copy the data to the frame
memcpy(&frame.content[frameOffset], &pktBuffer[pktWritten], writeable);
pktWritten += writeable;
frameOffset += writeable;
// If the packet is done being sent
if (pktWritten >= pktToWrite) {
// Prepare for a new packet
pktToWrite = 0;
pktWritten = 0;
}
}
// Send the frame
if (!txFrame(frame)) { break; }
}
delete[] pktBuffer;
}
}

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decoder_modules/ryfi_decoder/src/ryfi/transmitter.h Normal file
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#pragma once
#include "dsp/multirate/rational_resampler.h"
#include "dsp/taps/root_raised_cosine.h"
#include "dsp/filter/fir.h"
#include "packet.h"
#include "frame.h"
#include "rs_codec.h"
#include "conv_codec.h"
#include "framing.h"
#include <queue>
#include <mutex>
namespace ryfi {
class Transmitter {
public:
/**
* Create a transmitter.
* @param baudrate Baudrate to use over the air.
* @param samplerate Samplerate of the baseband.
*/
Transmitter(double baudrate, double samplerate);
// Destructor
~Transmitter();
/**
* Start the transmitter's DSP.
*/
void start();
/**
* Stop the transmitter's DSP.
*/
void stop();
/**
* Send a packet.
* @param pkg Packet to send.
* @return True if the packet was send, false if it was dropped.
*/
bool send(const Packet& pkt);
// Baseband output
dsp::stream<dsp::complex_t>* out;
static inline const int MAX_QUEUE_SIZE = 32;
private:
bool txFrame(const Frame& frame);
Packet popPacket();
void worker();
// Packet queue
std::mutex packetsMtx;
std::queue<Packet> packets;
// DSP
dsp::stream<uint8_t> in;
RSEncoder rs;
ConvEncoder conv;
Framer framer;
dsp::multirate::RationalResampler<dsp::complex_t> resamp;
dsp::tap<float> rrcTaps;
dsp::filter::FIR<dsp::complex_t, float> rrc;
bool running = false;
std::thread workerThread;
};
}