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ggwave.cpp
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ggwave.cpp
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#include "ggwave/ggwave.h"
#if !defined(ARDUINO) && !defined(PROGMEM)
#define PROGMEM
#endif
#include "fft.h"
#include "reed-solomon/rs.hpp"
#include <math.h>
#include <stdio.h>
//#include <random>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#ifdef GGWAVE_DISABLE_LOG
#define ggprintf(...)
#else
#ifdef ARDUINO
#define ggprintf(...)
#else
#define ggprintf(...) \
g_fptr && fprintf(g_fptr, __VA_ARGS__)
#endif
#endif
#define GG_MIN(A, B) (((A) < (B)) ? (A) : (B))
#define GG_MAX(A, B) (((A) >= (B)) ? (A) : (B))
//
// C interface
//
namespace {
FILE * g_fptr = stderr;
GGWave * g_instances[GGWAVE_MAX_INSTANCES];
double linear_interp(double first_number, double second_number, double fraction) {
return (first_number + ((second_number - first_number)*fraction));
}
}
extern "C"
void ggwave_setLogFile(void * fptr) {
GGWave::setLogFile((FILE *) fptr);
}
extern "C"
ggwave_Parameters ggwave_getDefaultParameters(void) {
return GGWave::getDefaultParameters();
}
extern "C"
ggwave_Instance ggwave_init(ggwave_Parameters parameters) {
for (ggwave_Instance id = 0; id < GGWAVE_MAX_INSTANCES; ++id) {
if (g_instances[id] == nullptr) {
g_instances[id] = new GGWave({
parameters.payloadLength,
parameters.sampleRateInp,
parameters.sampleRateOut,
parameters.sampleRate,
parameters.samplesPerFrame,
parameters.soundMarkerThreshold,
parameters.sampleFormatInp,
parameters.sampleFormatOut,
parameters.operatingMode});
return id;
}
}
ggprintf("Failed to create GGWave instance - reached maximum number of instances (%d)\n", GGWAVE_MAX_INSTANCES);
return -1;
}
extern "C"
void ggwave_free(ggwave_Instance id) {
if (id >= 0 && id < GGWAVE_MAX_INSTANCES && g_instances[id]) {
delete (GGWave *) g_instances[id];
g_instances[id] = nullptr;
return;
}
ggprintf("Failed to free GGWave instance - invalid GGWave instance id %d\n", id);
}
extern "C"
int ggwave_encode(
ggwave_Instance id,
const void * payloadBuffer,
int payloadSize,
ggwave_ProtocolId protocolId,
int volume,
void * waveformBuffer,
int query) {
GGWave * ggWave = (GGWave *) g_instances[id];
if (ggWave == nullptr) {
ggprintf("Invalid GGWave instance %d\n", id);
return -1;
}
if (ggWave->init(payloadSize, (const char *) payloadBuffer, protocolId, volume) == false) {
ggprintf("Failed to initialize Tx transmission for GGWave instance %d\n", id);
return -1;
}
if (query != 0) {
if (query == 1) {
return ggWave->encodeSize_bytes();
}
return ggWave->encodeSize_samples();
}
const int nBytes = ggWave->encode();
if (nBytes == 0) {
ggprintf("Failed to encode data - GGWave instance %d\n", id);
return -1;
}
{
auto pSrc = (const char *) ggWave->txWaveform();
auto pDst = ( char *) waveformBuffer;
memcpy(pDst, pSrc, nBytes);
}
return nBytes;
}
extern "C"
int ggwave_decode(
ggwave_Instance id,
const void * waveformBuffer,
int waveformSize,
void * payloadBuffer) {
GGWave * ggWave = (GGWave *) g_instances[id];
if (ggWave->decode(waveformBuffer, waveformSize) == false) {
ggprintf("Failed to decode data - GGWave instance %d\n", id);
return -1;
}
static thread_local GGWave::TxRxData data;
const auto dataLength = ggWave->rxTakeData(data);
if (dataLength == -1) {
// failed to decode message
return -1;
} else if (dataLength > 0) {
memcpy(payloadBuffer, data.data(), dataLength);
}
return dataLength;
}
extern "C"
int ggwave_ndecode(
ggwave_Instance id,
const void * waveformBuffer,
int waveformSize,
void * payloadBuffer,
int payloadSize) {
GGWave * ggWave = (GGWave *) g_instances[id];
if (ggWave->decode(waveformBuffer, waveformSize) == false) {
ggprintf("Failed to decode data - GGWave instance %d\n", id);
return -1;
}
static thread_local GGWave::TxRxData data;
const auto dataLength = ggWave->rxTakeData(data);
if (dataLength == -1) {
// failed to decode message
return -1;
} else if (dataLength > payloadSize) {
// the payloadBuffer is not big enough to store the data
return -2;
} else if (dataLength > 0) {
memcpy(payloadBuffer, data.data(), dataLength);
}
return dataLength;
}
extern "C"
void ggwave_rxToggleProtocol(
ggwave_ProtocolId protocolId,
int state) {
GGWave::Protocols::rx().toggle(protocolId, state != 0);
}
extern "C"
void ggwave_txToggleProtocol(
ggwave_ProtocolId protocolId,
int state) {
GGWave::Protocols::tx().toggle(protocolId, state != 0);
}
extern "C"
void ggwave_rxProtocolSetFreqStart(
ggwave_ProtocolId protocolId,
int freqStart) {
GGWave::Protocols::rx()[protocolId].freqStart = freqStart;
}
extern "C"
void ggwave_txProtocolSetFreqStart(
ggwave_ProtocolId protocolId,
int freqStart) {
GGWave::Protocols::tx()[protocolId].freqStart = freqStart;
}
extern "C"
int ggwave_rxDurationFrames(ggwave_Instance id) {
GGWave * ggWave = (GGWave *) g_instances[id];
return ggWave->rxDurationFrames();
}
//
// C++ implementation
//
namespace {
// magic numbers used to XOR the Rx / Tx data
// this achieves more homogeneous distribution of the sound energy across the spectrum
constexpr int kDSSMagicSize = 64;
const uint8_t kDSSMagic[kDSSMagicSize] PROGMEM = {
0x96, 0x9f, 0xb4, 0xaf, 0x1b, 0x91, 0xde, 0xc5, 0x45, 0x75, 0xe8, 0x2e, 0x0f, 0x32, 0x4a, 0x5f,
0xb4, 0x56, 0x95, 0xcb, 0x7f, 0x6a, 0x54, 0x6a, 0x48, 0xf2, 0x0b, 0x7b, 0xcd, 0xfb, 0x93, 0x6d,
0x3c, 0x77, 0x5e, 0xc3, 0x33, 0x47, 0xc0, 0xf1, 0x71, 0x32, 0x33, 0x27, 0x35, 0x68, 0x47, 0x1f,
0x4e, 0xac, 0x23, 0x42, 0x5f, 0x00, 0x37, 0xa4, 0x50, 0x6d, 0x48, 0x24, 0x91, 0x7c, 0xa1, 0x4e,
};
uint8_t getDSSMagic(int i) {
#ifdef ARDUINO
return pgm_read_byte(&kDSSMagic[i % kDSSMagicSize]);
#else
return kDSSMagic[i % kDSSMagicSize];
#endif
}
void FFT(float * f, int N, int * wi, float * wf) {
rdft(N, 1, f, wi, wf);
}
void FFT(const float * src, float * dst, int N, int * wi, float * wf) {
memcpy(dst, src, N * sizeof(float));
FFT(dst, N, wi, wf);
}
inline void addAmplitudeSmooth(
const GGWave::Amplitude & src,
GGWave::Amplitude & dst,
float scalar, int startId, int finalId, int cycleMod, int nPerCycle) {
const int nTotal = nPerCycle*finalId;
const float frac = 0.15f;
const float ds = frac*nTotal;
const float ids = 1.0f/ds;
const int nBegin = frac*nTotal;
const int nEnd = (1.0f - frac)*nTotal;
for (int i = startId; i < finalId; i++) {
const float k = cycleMod*finalId + i;
if (k < nBegin) {
dst[i] += scalar*src[i]*(k*ids);
} else if (k > nEnd) {
dst[i] += scalar*src[i]*(((float)(nTotal) - k)*ids);
} else {
dst[i] += scalar*src[i];
}
}
}
int getECCBytesForLength(int len) {
return len < 4 ? 2 : GG_MAX(4, 2*(len/5));
}
int bytesForSampleFormat(GGWave::SampleFormat sampleFormat) {
switch (sampleFormat) {
case GGWAVE_SAMPLE_FORMAT_UNDEFINED: return 0; break;
case GGWAVE_SAMPLE_FORMAT_U8: return sizeof(uint8_t); break;
case GGWAVE_SAMPLE_FORMAT_I8: return sizeof(int8_t); break;
case GGWAVE_SAMPLE_FORMAT_U16: return sizeof(uint16_t); break;
case GGWAVE_SAMPLE_FORMAT_I16: return sizeof(int16_t); break;
case GGWAVE_SAMPLE_FORMAT_F32: return sizeof(float); break;
};
ggprintf("Invalid sample format: %d\n", (int) sampleFormat);
return 0;
}
}
//
// ggvector
//
template<typename T>
void ggvector<T>::assign(const ggvector & other) {
m_data = other.m_data;
m_size = other.m_size;
}
template<typename T>
void ggvector<T>::copy(const ggvector & other) {
if (this == &other) {
assert(false);
}
memcpy(m_data, other.m_data, GG_MIN(m_size, other.m_size)*sizeof(T));
}
template<typename T>
void ggvector<T>::zero() {
memset(m_data, 0, m_size*sizeof(T));
}
template<typename T>
void ggvector<T>::zero(int n) {
memset(m_data, 0, n*sizeof(T));
}
template struct ggvector<int16_t>;
//
// ggmatrix
//
template <typename T>
void ggmatrix<T>::zero() {
if (m_size0 > 0 && m_size1 > 0) {
memset(m_data, 0, m_size0*m_size1*sizeof(T));
}
}
//
// Protocols
//
void GGWave::Protocols::enableAll() {
for (int i = 0; i < GGWAVE_PROTOCOL_COUNT; i++) {
auto & p = this->data[i];
if (p.name) {
p.enabled = true;
}
}
}
void GGWave::Protocols::disableAll() {
for (int i = 0; i < GGWAVE_PROTOCOL_COUNT; i++) {
auto & p = this->data[i];
p.enabled = false;
}
}
void GGWave::Protocols::toggle(ProtocolId id, bool state) {
if (state) {
// enable protocol
data[id].enabled = true;
} else {
// disable protocol
data[id].enabled = false;
}
}
void GGWave::Protocols::only(ProtocolId id) {
disableAll();
data[id].enabled = true;
}
GGWave::TxProtocols & GGWave::Protocols::tx() {
static TxProtocols protocols = kDefault();
return protocols;
}
GGWave::RxProtocols & GGWave::Protocols::rx() {
static RxProtocols protocols = kDefault();
return protocols;
}
// this probably does not matter, but adding it anyway
#ifdef ARDUINO
const int kAlignment = 4;
#else
const int kAlignment = 8;
#endif
//template <typename T>
//void ggalloc(std::vector<T> & v, int n, void * buf, int & bufSize) {
// if (buf == nullptr) {
// bufSize += n*sizeof(T);
// bufSize = ((bufSize + kAlignment - 1)/kAlignment)*kAlignment;
// return;
// }
//
// v.resize(n);
// bufSize += n*sizeof(T);
// bufSize = ((bufSize + kAlignment - 1)/kAlignment)*kAlignment;
//}
//
//template <typename T>
//void ggalloc(std::vector<std::vector<T>> & v, int n, int m, void * buf, int & bufSize) {
// if (buf == nullptr) {
// bufSize += n*m*sizeof(T);
// bufSize = ((bufSize + kAlignment - 1)/kAlignment)*kAlignment;
// return;
// }
//
// v.resize(n);
// for (int i = 0; i < n; i++) {
// v[i].resize(m);
// }
// bufSize += n*m*sizeof(T);
// bufSize = ((bufSize + kAlignment - 1)/kAlignment)*kAlignment;
//}
template <typename T>
void ggalloc(ggvector<T> & v, int n, void * buf, int & bufSize) {
if (buf == nullptr) {
bufSize += n*sizeof(T);
bufSize = ((bufSize + kAlignment - 1)/kAlignment)*kAlignment;
return;
}
v.assign(ggvector<T>((T *)((char *) buf + bufSize), n));
bufSize += n*sizeof(T);
bufSize = ((bufSize + kAlignment - 1)/kAlignment)*kAlignment;
}
template <typename T>
void ggalloc(ggmatrix<T> & v, int n, int m, void * buf, int & bufSize) {
if (buf == nullptr) {
bufSize += n*m*sizeof(T);
bufSize = ((bufSize + kAlignment - 1) / kAlignment)*kAlignment;
return;
}
v = ggmatrix<T>((T *)((char *) buf + bufSize), n, m);
bufSize += n*m*sizeof(T);
bufSize = ((bufSize + kAlignment - 1)/kAlignment)*kAlignment;
}
//
// GGWave
//
GGWave::GGWave(const Parameters & parameters) {
prepare(parameters);
}
GGWave::~GGWave() {
if (m_heap) {
free(m_heap);
}
}
bool GGWave::prepare(const Parameters & parameters, bool allocate) {
if (m_heap) {
free(m_heap);
m_heap = nullptr;
m_heapSize = 0;
}
// parameter initialization:
m_sampleRateInp = parameters.sampleRateInp;
m_sampleRateOut = parameters.sampleRateOut;
m_sampleRate = parameters.sampleRate;
m_samplesPerFrame = parameters.samplesPerFrame;
m_isamplesPerFrame = 1.0f/m_samplesPerFrame;
m_sampleSizeInp = bytesForSampleFormat(parameters.sampleFormatInp);
m_sampleSizeOut = bytesForSampleFormat(parameters.sampleFormatOut);
m_sampleFormatInp = parameters.sampleFormatInp;
m_sampleFormatOut = parameters.sampleFormatOut;
m_hzPerSample = m_sampleRate/m_samplesPerFrame;
m_ihzPerSample = 1.0f/m_hzPerSample;
m_freqDelta_bin = 1;
m_freqDelta_hz = 2*m_hzPerSample;
m_nBitsInMarker = 16;
m_nMarkerFrames = parameters.payloadLength > 0 ? 0 : kDefaultMarkerFrames;
m_encodedDataOffset = parameters.payloadLength > 0 ? 0 : kDefaultEncodedDataOffset;
m_soundMarkerThreshold = parameters.soundMarkerThreshold;
m_isFixedPayloadLength = parameters.payloadLength > 0;
m_payloadLength = parameters.payloadLength;
m_isRxEnabled = parameters.operatingMode & GGWAVE_OPERATING_MODE_RX;
m_isTxEnabled = parameters.operatingMode & GGWAVE_OPERATING_MODE_TX;
m_needResampling = m_sampleRateInp != m_sampleRate || m_sampleRateOut != m_sampleRate;
m_txOnlyTones = parameters.operatingMode & GGWAVE_OPERATING_MODE_TX_ONLY_TONES;
m_isDSSEnabled = parameters.operatingMode & GGWAVE_OPERATING_MODE_USE_DSS;
if (m_sampleSizeInp == 0) {
ggprintf("Invalid or unsupported capture sample format: %d\n", (int) parameters.sampleFormatInp);
return false;
}
if (m_sampleSizeOut == 0) {
ggprintf("Invalid or unsupported playback sample format: %d\n", (int) parameters.sampleFormatOut);
return false;
}
if (parameters.samplesPerFrame > kMaxSamplesPerFrame) {
ggprintf("Invalid samples per frame: %d, max: %d\n", parameters.samplesPerFrame, kMaxSamplesPerFrame);
return false;
}
if (m_sampleRateInp < kSampleRateMin) {
ggprintf("Error: capture sample rate (%g Hz) must be >= %g Hz\n", m_sampleRateInp, kSampleRateMin);
return false;
}
if (m_sampleRateInp > kSampleRateMax) {
ggprintf("Error: capture sample rate (%g Hz) must be <= %g Hz\n", m_sampleRateInp, kSampleRateMax);
return false;
}
// memory allocation:
m_heap = nullptr;
m_heapSize = 0;
if (this->alloc(m_heap, m_heapSize) == false) {
ggprintf("Error: failed to compute the size of the required memory\n");
return false;
}
if (allocate == false) {
return true;
}
const auto heapSize0 = m_heapSize;
m_heap = calloc(m_heapSize, 1);
m_heapSize = 0;
if (this->alloc(m_heap, m_heapSize) == false) {
ggprintf("Error: failed to allocate the required memory: %d\n", m_heapSize);
return false;
}
if (heapSize0 != m_heapSize) {
ggprintf("Error: failed to allocate memory - heapSize0: %d, heapSize: %d\n", heapSize0, m_heapSize);
return false;
}
if (m_isRxEnabled) {
m_rx.samplesNeeded = m_samplesPerFrame;
m_rx.fftWorkI[0] = 0;
m_rx.protocol = {};
m_rx.protocolId = GGWAVE_PROTOCOL_COUNT;
m_rx.protocols = Protocols::rx();
m_rx.minFreqStart = minFreqStart(m_rx.protocols);
}
if (m_isTxEnabled) {
m_tx.protocols = Protocols::tx();
}
return init("", {}, 0);
}
bool GGWave::alloc(void * p, int & n) {
const int maxLength = m_isFixedPayloadLength ? m_payloadLength : kMaxLengthVariable;
const int totalLength = maxLength + getECCBytesForLength(maxLength);
const int totalTxs = (totalLength + minBytesPerTx(Protocols::rx()) - 1)/minBytesPerTx(Protocols::tx());
if (totalLength > kMaxDataSize) {
ggprintf("Error: total length %d (payload %d + ECC %d bytes) is too large ( > %d)\n",
totalLength, maxLength, getECCBytesForLength(maxLength), kMaxDataSize);
return false;
}
// common
::ggalloc(m_dataEncoded, totalLength + m_encodedDataOffset, p, n);
if (m_isRxEnabled) {
::ggalloc(m_rx.fftOut, 2*m_samplesPerFrame, p, n);
::ggalloc(m_rx.fftWorkI, 3 + sqrt(m_samplesPerFrame/2), p, n);
::ggalloc(m_rx.fftWorkF, m_samplesPerFrame/2, p, n);
::ggalloc(m_rx.spectrum, m_samplesPerFrame, p, n);
// small extra space because sometimes resampling needs a few more samples:
::ggalloc(m_rx.amplitude, m_needResampling ? m_samplesPerFrame + 128 : m_samplesPerFrame, p, n);
// min input sampling rate is 0.125*m_sampleRate:
::ggalloc(m_rx.amplitudeResampled, m_needResampling ? 8*m_samplesPerFrame : m_samplesPerFrame, p, n);
::ggalloc(m_rx.amplitudeTmp, m_needResampling ? 8*m_samplesPerFrame*m_sampleSizeInp : m_samplesPerFrame*m_sampleSizeInp, p, n);
::ggalloc(m_rx.data, maxLength + 1, p, n); // extra byte for null-termination
if (m_isFixedPayloadLength) {
if (m_payloadLength > kMaxLengthFixed) {
ggprintf("Invalid payload length: %d, max: %d\n", m_payloadLength, kMaxLengthFixed);
return false;
}
::ggalloc(m_rx.spectrumHistoryFixed, totalTxs*maxFramesPerTx(Protocols::rx(), false), m_samplesPerFrame, p, n);
::ggalloc(m_rx.detectedBins, 2*totalLength, p, n);
::ggalloc(m_rx.detectedTones, 2*16*maxBytesPerTx(Protocols::rx()), p, n);
} else {
// variable payload length
::ggalloc(m_rx.amplitudeRecorded, kMaxRecordedFrames*m_samplesPerFrame, p, n);
::ggalloc(m_rx.amplitudeAverage, m_samplesPerFrame, p, n);
::ggalloc(m_rx.amplitudeHistory, kMaxSpectrumHistory, m_samplesPerFrame, p, n);
}
}
if (m_isTxEnabled) {
const int maxDataBits = 2*16*maxBytesPerTx(Protocols::tx());
if (m_txOnlyTones == false) {
::ggalloc(m_tx.phaseOffsets, maxDataBits, p, n);
::ggalloc(m_tx.bit0Amplitude, maxDataBits, m_samplesPerFrame, p, n);
::ggalloc(m_tx.bit1Amplitude, maxDataBits, m_samplesPerFrame, p, n);
::ggalloc(m_tx.output, m_samplesPerFrame, p, n);
::ggalloc(m_tx.outputResampled, 2*m_samplesPerFrame, p, n);
::ggalloc(m_tx.outputTmp, kMaxRecordedFrames*m_samplesPerFrame*m_sampleSizeOut, p, n);
::ggalloc(m_tx.outputI16, kMaxRecordedFrames*m_samplesPerFrame, p, n);
}
const int maxTones = m_isFixedPayloadLength ? maxTonesPerTx(Protocols::tx()) : m_nBitsInMarker;
::ggalloc(m_tx.data, maxLength + 1, p, n); // first byte stores the length
::ggalloc(m_tx.dataBits, maxDataBits, p, n);
::ggalloc(m_tx.tones, maxTones*totalTxs + (maxTones > 1 ? totalTxs : 0), p, n);
}
// pre-allocate Reed-Solomon memory buffers
{
const auto maxLength = m_isFixedPayloadLength ? m_payloadLength : kMaxLengthVariable;
if (m_isFixedPayloadLength == false) {
::ggalloc(m_workRSLength, RS::ReedSolomon::getWorkSize_bytes(1, m_encodedDataOffset - 1), p, n);
}
::ggalloc(m_workRSData, RS::ReedSolomon::getWorkSize_bytes(maxLength, getECCBytesForLength(maxLength)), p, n);
}
if (m_needResampling) {
m_resampler.alloc(p, n);
}
return true;
}
void GGWave::setLogFile(FILE * fptr) {
g_fptr = fptr;
}
const GGWave::Parameters & GGWave::getDefaultParameters() {
static ggwave_Parameters result {
-1, // vaiable payload length
kDefaultSampleRate,
kDefaultSampleRate,
kDefaultSampleRate,
kDefaultSamplesPerFrame,
kDefaultSoundMarkerThreshold,
GGWAVE_SAMPLE_FORMAT_F32,
GGWAVE_SAMPLE_FORMAT_F32,
GGWAVE_OPERATING_MODE_RX | GGWAVE_OPERATING_MODE_TX,
};
return result;
}
bool GGWave::init(const char * text, TxProtocolId protocolId, const int volume) {
return init(strlen(text), text, protocolId, volume);
}
bool GGWave::init(int dataSize, const char * dataBuffer, TxProtocolId protocolId, const int volume) {
if (dataSize < 0) {
ggprintf("Negative data size: %d\n", dataSize);
return false;
}
// Tx
if (m_isTxEnabled) {
const auto maxLength = m_isFixedPayloadLength ? m_payloadLength : kMaxLengthVariable;
if (dataSize > maxLength) {
ggprintf("Truncating data from %d to %d bytes\n", dataSize, maxLength);
dataSize = maxLength;
}
if (volume < 0 || volume > 100) {
ggprintf("Invalid volume: %d\n", volume);
return false;
}
m_tx.hasData = false;
m_tx.data.zero();
m_dataEncoded.zero();
if (dataSize > 0) {
if (protocolId < 0 || protocolId >= m_tx.protocols.size()) {
ggprintf("Invalid protocol ID: %d\n", protocolId);
return false;
}
const auto & protocol = m_tx.protocols[protocolId];
if (protocol.enabled == false) {
ggprintf("Protocol %d is not enabled - make sure to enable it before creating the instance\n", protocolId);
return false;
}
if (protocol.extra == 2 && m_isFixedPayloadLength == false) {
ggprintf("Mono-tone protocols with variable length are not supported\n");
return false;
}
m_tx.protocol = protocol;
m_tx.dataLength = m_isFixedPayloadLength ? m_payloadLength : dataSize;
m_tx.sendVolume = ((double)(volume))/100.0f;
m_tx.data[0] = m_tx.dataLength;
for (int i = 0; i < m_tx.dataLength; ++i) {
m_tx.data[i + 1] = i < dataSize ? dataBuffer[i] : 0;
if (m_isDSSEnabled) {
m_tx.data[i + 1] ^= getDSSMagic(i);
}
}
m_tx.hasData = true;
}
} else {
if (dataSize > 0) {
ggprintf("Tx is disabled - cannot transmit data with this GGWave instance\n");
}
}
// Rx
if (m_isRxEnabled) {
m_rx.receiving = false;
m_rx.analyzing = false;
m_rx.framesToAnalyze = 0;
m_rx.framesLeftToAnalyze = 0;
m_rx.framesToRecord = 0;
m_rx.framesLeftToRecord = 0;
m_rx.spectrum.zero();
m_rx.amplitude.zero();
m_rx.amplitudeHistory.zero();
m_rx.data.zero();
m_rx.spectrumHistoryFixed.zero();
}
return true;
}
uint32_t GGWave::encodeSize_bytes() const {
return encodeSize_samples()*m_sampleSizeOut;
}
uint32_t GGWave::encodeSize_samples() const {
if (m_tx.hasData == false) {
return 0;
}
float factor = 1.0f;
int samplesPerFrameOut = m_samplesPerFrame;
if (m_needResampling) {
factor = m_sampleRate/m_sampleRateOut;
// note : +1 extra sample in order to overestimate the buffer size
samplesPerFrameOut = m_resampler.resample(factor, m_samplesPerFrame, m_tx.output.data(), nullptr) + 1;
}
const int nECCBytesPerTx = getECCBytesForLength(m_tx.dataLength);
const int sendDataLength = m_tx.dataLength + m_encodedDataOffset;
const int totalBytes = sendDataLength + nECCBytesPerTx;
const int totalDataFrames = m_tx.protocol.extra*((totalBytes + m_tx.protocol.bytesPerTx - 1)/m_tx.protocol.bytesPerTx)*m_tx.protocol.framesPerTx;
return (
m_nMarkerFrames + totalDataFrames + m_nMarkerFrames
)*samplesPerFrameOut;
}
uint32_t GGWave::encode() {
if (m_isTxEnabled == false) {
ggprintf("Tx is disabled - cannot transmit data with this GGWave instance\n");
return 0;
}
if (m_needResampling) {
m_resampler.reset();
}
const int nECCBytesPerTx = getECCBytesForLength(m_tx.dataLength);
const int sendDataLength = m_tx.dataLength + m_encodedDataOffset;
const int totalBytes = sendDataLength + nECCBytesPerTx;
const int totalDataFrames = m_tx.protocol.extra*((totalBytes + m_tx.protocol.bytesPerTx - 1)/m_tx.protocol.bytesPerTx)*m_tx.protocol.framesPerTx;
if (m_isFixedPayloadLength == false) {
RS::ReedSolomon rsLength(1, m_encodedDataOffset - 1, m_workRSLength.data());
rsLength.Encode(m_tx.data.data(), m_dataEncoded.data());
}
// first byte of m_tx.data contains the length of the payload, so we skip it:
RS::ReedSolomon rsData = RS::ReedSolomon(m_tx.dataLength, nECCBytesPerTx, m_workRSData.data());
rsData.Encode(m_tx.data.data() + 1, m_dataEncoded.data() + m_encodedDataOffset);
// generate tones
{
int frameId = 0;
bool hasData = m_tx.hasData;
m_tx.nTones = 0;
while (hasData) {
if (frameId < m_nMarkerFrames) {
for (int i = 0; i < m_nBitsInMarker; ++i) {
m_tx.tones[m_tx.nTones++] = 2*i + i%2;
}
} else if (frameId < m_nMarkerFrames + totalDataFrames) {
int dataOffset = frameId - m_nMarkerFrames;
dataOffset /= m_tx.protocol.framesPerTx;
dataOffset *= m_tx.protocol.bytesPerTx;
m_tx.dataBits.zero();
for (int j = 0; j < m_tx.protocol.bytesPerTx; ++j) {
if (m_tx.protocol.extra == 1) {
{
uint8_t d = m_dataEncoded[dataOffset + j] & 15;
m_tx.dataBits[(2*j + 0)*16 + d] = 1;
}
{
uint8_t d = m_dataEncoded[dataOffset + j] & 240;
m_tx.dataBits[(2*j + 1)*16 + (d >> 4)] = 1;
}
} else {
if (dataOffset % m_tx.protocol.extra == 0) {
uint8_t d = m_dataEncoded[dataOffset/m_tx.protocol.extra + j] & 15;
m_tx.dataBits[(2*j + 0)*16 + d] = 1;
} else {
uint8_t d = m_dataEncoded[dataOffset/m_tx.protocol.extra + j] & 240;
m_tx.dataBits[(2*j + 0)*16 + (d >> 4)] = 1;
}
}
}
for (int k = 0; k < 2*m_tx.protocol.bytesPerTx*16; ++k) {
if (m_tx.dataBits[k] == 0) continue;
m_tx.tones[m_tx.nTones++] = k;
}
} else if (frameId < m_nMarkerFrames + totalDataFrames + m_nMarkerFrames) {
for (int i = 0; i < m_nBitsInMarker; ++i) {
m_tx.tones[m_tx.nTones++] = 2*i + (1 - i%2);
}
} else {
hasData = false;
break;
}
if (m_tx.protocol.nTones() > 1) {
m_tx.tones[m_tx.nTones++] = -1;
}
frameId += m_tx.protocol.framesPerTx;
}
if (m_txOnlyTones) {
m_tx.hasData = false;
return true;
}
}
// compute Tx data
{
for (int k = 0; k < (int) m_tx.phaseOffsets.size(); ++k) {
m_tx.phaseOffsets[k] = (M_PI*k)/(m_tx.protocol.nDataBitsPerTx());
}
// note : what is the purpose of this shuffle ? I forgot .. :(
//std::random_device rd;
//std::mt19937 g(rd());
//std::shuffle(phaseOffsets.begin(), phaseOffsets.end(), g);
for (int k = 0; k < (int) m_tx.dataBits.size(); ++k) {
const double freq = bitFreq(m_tx.protocol, k);
const double phaseOffset = m_tx.phaseOffsets[k];
const double curHzPerSample = m_hzPerSample;
const double curIHzPerSample = 1.0/curHzPerSample;
for (int i = 0; i < m_samplesPerFrame; i++) {
const double curi = i;
m_tx.bit1Amplitude[k][i] = sin((2.0*M_PI)*(curi*m_isamplesPerFrame)*(freq*curIHzPerSample) + phaseOffset);
}
for (int i = 0; i < m_samplesPerFrame; i++) {
const double curi = i;
m_tx.bit0Amplitude[k][i] = sin((2.0*M_PI)*(curi*m_isamplesPerFrame)*((freq + m_hzPerSample*m_freqDelta_bin)*curIHzPerSample) + phaseOffset);
}
}
}
int frameId = 0;
uint32_t offset = 0;
const float factor = m_sampleRate/m_sampleRateOut;
while (m_tx.hasData) {
m_tx.output.zero();
uint16_t nFreq = 0;
if (frameId < m_nMarkerFrames) {
nFreq = m_nBitsInMarker;
for (int i = 0; i < m_nBitsInMarker; ++i) {
if (i%2 == 0) {
::addAmplitudeSmooth(m_tx.bit1Amplitude[i], m_tx.output, m_tx.sendVolume, 0, m_samplesPerFrame, frameId, m_nMarkerFrames);
} else {
::addAmplitudeSmooth(m_tx.bit0Amplitude[i], m_tx.output, m_tx.sendVolume, 0, m_samplesPerFrame, frameId, m_nMarkerFrames);
}
}
} else if (frameId < m_nMarkerFrames + totalDataFrames) {
int dataOffset = frameId - m_nMarkerFrames;
int cycleModMain = dataOffset%m_tx.protocol.framesPerTx;
dataOffset /= m_tx.protocol.framesPerTx;
dataOffset *= m_tx.protocol.bytesPerTx;
m_tx.dataBits.zero();
for (int j = 0; j < m_tx.protocol.bytesPerTx; ++j) {
if (m_tx.protocol.extra == 1) {
{
uint8_t d = m_dataEncoded[dataOffset + j] & 15;
m_tx.dataBits[(2*j + 0)*16 + d] = 1;
}
{
uint8_t d = m_dataEncoded[dataOffset + j] & 240;
m_tx.dataBits[(2*j + 1)*16 + (d >> 4)] = 1;
}
} else {
if (dataOffset % m_tx.protocol.extra == 0) {
uint8_t d = m_dataEncoded[dataOffset/m_tx.protocol.extra + j] & 15;
m_tx.dataBits[(2*j + 0)*16 + d] = 1;
} else {
uint8_t d = m_dataEncoded[dataOffset/m_tx.protocol.extra + j] & 240;
m_tx.dataBits[(2*j + 0)*16 + (d >> 4)] = 1;
}
}
}
for (int k = 0; k < 2*m_tx.protocol.bytesPerTx*16; ++k) {
if (m_tx.dataBits[k] == 0) continue;
++nFreq;
if (k%2) {
::addAmplitudeSmooth(m_tx.bit0Amplitude[k/2], m_tx.output, m_tx.sendVolume, 0, m_samplesPerFrame, cycleModMain, m_tx.protocol.framesPerTx);
} else {
::addAmplitudeSmooth(m_tx.bit1Amplitude[k/2], m_tx.output, m_tx.sendVolume, 0, m_samplesPerFrame, cycleModMain, m_tx.protocol.framesPerTx);
}
}
} else if (frameId < m_nMarkerFrames + totalDataFrames + m_nMarkerFrames) {
nFreq = m_nBitsInMarker;
const int fId = frameId - (m_nMarkerFrames + totalDataFrames);
for (int i = 0; i < m_nBitsInMarker; ++i) {
if (i%2 == 0) {
addAmplitudeSmooth(m_tx.bit0Amplitude[i], m_tx.output, m_tx.sendVolume, 0, m_samplesPerFrame, fId, m_nMarkerFrames);
} else {
addAmplitudeSmooth(m_tx.bit1Amplitude[i], m_tx.output, m_tx.sendVolume, 0, m_samplesPerFrame, fId, m_nMarkerFrames);
}
}
} else {
m_tx.hasData = false;
break;
}
if (nFreq == 0) nFreq = 1;
const float scale = 1.0f/nFreq;
for (int i = 0; i < m_samplesPerFrame; ++i) {
m_tx.output[i] *= scale;
}
int samplesPerFrameOut = m_samplesPerFrame;
if (m_needResampling) {
samplesPerFrameOut = m_resampler.resample(factor, m_samplesPerFrame, m_tx.output.data(), m_tx.outputResampled.data());
} else {
m_tx.outputResampled.copy(m_tx.output);
}
// default output is in 16-bit signed int so we always compute it