mirror of
https://github.com/ggerganov/ggwave.git
synced 2026-02-06 08:37:59 +08:00
00b23ff54f
* inital implementation * remove file * ggwave-cli : txProtocol -> txProtocolId * ggwave : add custom protocol enum values * r2t2 : use cutom protocols * r2t2 : build only on Unix systems * r2t2 : remove thread * r2t2-rx : wip * r2t2 : wasm build ready + various fixes * r2t2 : error message * Update README.md * Update README.md * Update README.md * Update README.md * r2t2 : length 16 * r2t2 : use slow protocol by default * r2t2 : add timestamp * r2t2 : update html * r2t2 : update github link * r2t2 : more robust tx * r2t2 : add option to use beep command * emscripten : cannot use requestAnimationFrame when capturing audio This causes the queued audio buffer to grow indefinitely when the page is not focused, causing the process to run out of memory. * r2t2 : disable beep option * Update README.md * Update README.md * Update README.md * Update README.md * Update README.md * Update README.md * r2t2 : add example to README
1360 lines
47 KiB
C++
1360 lines
47 KiB
C++
#include "ggwave/ggwave.h"
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#include "resampler.h"
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#include "reed-solomon/rs.hpp"
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#include <chrono>
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#include <cmath>
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#include <algorithm>
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#include <stdexcept>
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#include <map>
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//#include <random>
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//
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// C interface
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//
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namespace {
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std::map<ggwave_Instance, GGWave *> g_instances;
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}
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extern "C"
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ggwave_Parameters ggwave_getDefaultParameters(void) {
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return GGWave::getDefaultParameters();
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}
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extern "C"
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ggwave_Instance ggwave_init(const ggwave_Parameters parameters) {
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static ggwave_Instance curId = 0;
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g_instances[curId] = new GGWave({
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parameters.payloadLength,
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parameters.sampleRateInp,
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parameters.sampleRateOut,
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parameters.samplesPerFrame,
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parameters.soundMarkerThreshold,
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parameters.sampleFormatInp,
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parameters.sampleFormatOut});
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return curId++;
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}
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extern "C"
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void ggwave_free(ggwave_Instance instance) {
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delete (GGWave *) g_instances[instance];
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g_instances.erase(instance);
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}
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extern "C"
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int ggwave_encode(
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ggwave_Instance instance,
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const char * dataBuffer,
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int dataSize,
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ggwave_TxProtocolId txProtocolId,
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int volume,
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char * outputBuffer,
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int query) {
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GGWave * ggWave = (GGWave *) g_instances[instance];
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if (ggWave == nullptr) {
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fprintf(stderr, "Invalid GGWave instance %d\n", instance);
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return -1;
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}
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if (ggWave->init(dataSize, dataBuffer, ggWave->getTxProtocol(txProtocolId), volume) == false) {
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fprintf(stderr, "Failed to initialize GGWave instance %d\n", instance);
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return -1;
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}
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if (query != 0) {
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if (query == 1) {
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return ggWave->encodeSize_bytes();
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}
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return ggWave->encodeSize_samples();
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}
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int nSamples = 0;
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GGWave::CBWaveformOut cbWaveformOut = [&](const void * data, uint32_t nBytes) {
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char * p = (char *) data;
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std::copy(p, p + nBytes, outputBuffer);
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nSamples = nBytes/ggWave->getSampleSizeBytesOut();
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};
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if (ggWave->encode(cbWaveformOut) == false) {
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fprintf(stderr, "Failed to encode data - GGWave instance %d\n", instance);
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return -1;
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}
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return nSamples;
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}
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extern "C"
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int ggwave_decode(
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ggwave_Instance instance,
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const char * dataBuffer,
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int dataSize,
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char * outputBuffer) {
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GGWave * ggWave = (GGWave *) g_instances[instance];
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GGWave::CBWaveformInp cbWaveformInp = [&](void * data, uint32_t nMaxBytes) -> uint32_t {
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uint32_t nCopied = std::min((uint32_t) dataSize, nMaxBytes);
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std::copy(dataBuffer, dataBuffer + nCopied, (char *) data);
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dataSize -= nCopied;
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dataBuffer += nCopied;
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return nCopied;
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};
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ggWave->decode(cbWaveformInp);
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// todo : avoid allocation
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GGWave::TxRxData rxData;
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auto rxDataLength = ggWave->takeRxData(rxData);
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if (rxDataLength == -1) {
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// failed to decode message
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return -1;
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} else if (rxDataLength > 0) {
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std::copy(rxData.begin(), rxData.end(), outputBuffer);
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}
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return rxDataLength;
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}
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//
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// C++ implementation
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//
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namespace {
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// FFT routines taken from https://stackoverflow.com/a/37729648/4039976
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int log2(int N) {
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int k = N, i = 0;
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while(k) {
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k >>= 1;
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i++;
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}
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return i - 1;
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}
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int reverse(int N, int n) {
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int j, p = 0;
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for(j = 1; j <= log2(N); j++) {
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if(n & (1 << (log2(N) - j)))
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p |= 1 << (j - 1);
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}
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return p;
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}
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void ordina(float * f1, int N) {
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static thread_local float f2[2*GGWave::kMaxSamplesPerFrame];
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for (int i = 0; i < N; i++) {
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int ir = reverse(N, i);
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f2[2*i + 0] = f1[2*ir + 0];
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f2[2*i + 1] = f1[2*ir + 1];
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}
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for (int j = 0; j < N; j++) {
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f1[2*j + 0] = f2[2*j + 0];
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f1[2*j + 1] = f2[2*j + 1];
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}
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}
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void transform(float * f, int N) {
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ordina(f, N); //first: reverse order
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float * W;
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W = (float *)malloc(N*sizeof(float));
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W[2*1 + 0] = cos(-2.*M_PI/N);
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W[2*1 + 1] = sin(-2.*M_PI/N);
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W[2*0 + 0] = 1;
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W[2*0 + 1] = 0;
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for (int i = 2; i < N / 2; i++) {
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W[2*i + 0] = cos(-2.*i*M_PI/N);
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W[2*i + 1] = sin(-2.*i*M_PI/N);
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}
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int n = 1;
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int a = N / 2;
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for(int j = 0; j < log2(N); j++) {
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for(int i = 0; i < N; i++) {
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if(!(i & n)) {
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int wi = (i * a) % (n * a);
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int fi = i + n;
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float a = W[2*wi + 0];
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float b = W[2*wi + 1];
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float c = f[2*fi + 0];
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float d = f[2*fi + 1];
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float temp[2] = { f[2*i + 0], f[2*i + 1] };
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float Temp[2] = { a*c - b*d, b*c + a*d };
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f[2*i + 0] = temp[0] + Temp[0];
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f[2*i + 1] = temp[1] + Temp[1];
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f[2*fi + 0] = temp[0] - Temp[0];
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f[2*fi + 1] = temp[1] - Temp[1];
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}
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}
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n *= 2;
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a = a / 2;
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}
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free(W);
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}
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void FFT(float * f, int N, float d) {
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transform(f, N);
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for (int i = 0; i < N; i++) {
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f[2*i + 0] *= d;
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f[2*i + 1] *= d;
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}
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}
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void FFT(const float * src, float * dst, int N, float d) {
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for (int i = 0; i < N; ++i) {
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dst[2*i + 0] = src[i];
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dst[2*i + 1] = 0.0f;
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}
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FFT(dst, N, d);
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}
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inline void addAmplitudeSmooth(
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const GGWave::AmplitudeData & src,
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GGWave::AmplitudeData & dst,
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float scalar, int startId, int finalId, int cycleMod, int nPerCycle) {
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int nTotal = nPerCycle*finalId;
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float frac = 0.15f;
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float ds = frac*nTotal;
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float ids = 1.0f/ds;
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int nBegin = frac*nTotal;
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int nEnd = (1.0f - frac)*nTotal;
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for (int i = startId; i < finalId; i++) {
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float k = cycleMod*finalId + i;
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if (k < nBegin) {
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dst[i] += scalar*src[i]*(k*ids);
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} else if (k > nEnd) {
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dst[i] += scalar*src[i]*(((float)(nTotal) - k)*ids);
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} else {
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dst[i] += scalar*src[i];
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}
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}
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}
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template <class T>
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float getTime_ms(const T & tStart, const T & tEnd) {
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return ((float)(std::chrono::duration_cast<std::chrono::microseconds>(tEnd - tStart).count()))/1000.0;
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}
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int getECCBytesForLength(int len) {
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return len < 4 ? 2 : std::max(4, 2*(len/5));
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}
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int bytesForSampleFormat(GGWave::SampleFormat sampleFormat) {
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switch (sampleFormat) {
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case GGWAVE_SAMPLE_FORMAT_UNDEFINED: return 0; break;
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case GGWAVE_SAMPLE_FORMAT_U8: return sizeof(uint8_t); break;
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case GGWAVE_SAMPLE_FORMAT_I8: return sizeof(int8_t); break;
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case GGWAVE_SAMPLE_FORMAT_U16: return sizeof(uint16_t); break;
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case GGWAVE_SAMPLE_FORMAT_I16: return sizeof(int16_t); break;
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case GGWAVE_SAMPLE_FORMAT_F32: return sizeof(float); break;
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};
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fprintf(stderr, "Invalid sample format: %d\n", (int) sampleFormat);
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return 0;
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}
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}
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struct GGWave::Impl {
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Resampler resampler;
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};
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const GGWave::Parameters & GGWave::getDefaultParameters() {
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static ggwave_Parameters result {
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-1, // vaiable payload length
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kBaseSampleRate,
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kBaseSampleRate,
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kDefaultSamplesPerFrame,
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kDefaultSoundMarkerThreshold,
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GGWAVE_SAMPLE_FORMAT_F32,
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GGWAVE_SAMPLE_FORMAT_F32,
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};
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return result;
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}
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GGWave::GGWave(const Parameters & parameters) :
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m_sampleRateInp(parameters.sampleRateInp),
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m_sampleRateOut(parameters.sampleRateOut),
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m_samplesPerFrame(parameters.samplesPerFrame),
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m_isamplesPerFrame(1.0f/m_samplesPerFrame),
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m_sampleSizeBytesInp(bytesForSampleFormat(parameters.sampleFormatInp)),
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m_sampleSizeBytesOut(bytesForSampleFormat(parameters.sampleFormatOut)),
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m_sampleFormatInp(parameters.sampleFormatInp),
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m_sampleFormatOut(parameters.sampleFormatOut),
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m_hzPerSample(kBaseSampleRate/parameters.samplesPerFrame),
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m_ihzPerSample(1.0f/m_hzPerSample),
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m_freqDelta_bin(1),
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m_freqDelta_hz(2*m_hzPerSample),
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m_nBitsInMarker(16),
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m_nMarkerFrames(parameters.payloadLength > 0 ? 0 : kDefaultMarkerFrames),
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m_encodedDataOffset(parameters.payloadLength > 0 ? 0 : kDefaultEncodedDataOffset),
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m_soundMarkerThreshold(parameters.soundMarkerThreshold),
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// common
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m_isFixedPayloadLength(parameters.payloadLength > 0),
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m_payloadLength(parameters.payloadLength),
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// Rx
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m_samplesNeeded(m_samplesPerFrame),
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m_fftInp(kMaxSamplesPerFrame),
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m_fftOut(2*kMaxSamplesPerFrame),
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m_hasNewSpectrum(false),
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m_hasNewAmplitude(false),
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m_sampleSpectrum(kMaxSamplesPerFrame),
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m_sampleAmplitude(kMaxSamplesPerFrame + 128), // small extra space because sometimes resampling needs a few more samples
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m_sampleAmplitudeResampled(8*kMaxSamplesPerFrame), // min input sampling rate is 0.125*kBaseSampleRate
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m_sampleAmplitudeTmp(8*kMaxSamplesPerFrame*m_sampleSizeBytesInp),
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m_hasNewRxData(false),
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m_lastRxDataLength(0),
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m_rxData(kMaxDataSize),
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m_rxProtocol(getDefaultTxProtocol()),
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m_rxProtocolId(getDefaultTxProtocolId()),
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m_rxProtocols(getTxProtocols()),
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m_historyId(0),
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m_sampleAmplitudeAverage(kMaxSamplesPerFrame),
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m_sampleAmplitudeHistory(kMaxSpectrumHistory),
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m_historyIdFixed(0),
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// Tx
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m_hasNewTxData(false),
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m_sendVolume(0.1),
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m_txDataLength(0),
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m_txData(kMaxDataSize),
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m_txDataEncoded(kMaxDataSize),
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m_outputBlock(kMaxSamplesPerFrame),
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m_outputBlockResampled(2*kMaxSamplesPerFrame),
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m_outputBlockTmp(kMaxRecordedFrames*kMaxSamplesPerFrame*m_sampleSizeBytesOut),
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m_outputBlockI16(kMaxRecordedFrames*kMaxSamplesPerFrame),
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m_impl(new Impl()) {
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if (m_payloadLength > 0) {
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// fixed payload length
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if (m_payloadLength > kMaxLengthFixed) {
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throw std::runtime_error("Invalid payload legnth");
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}
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m_txDataLength = m_payloadLength;
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int totalLength = m_txDataLength + getECCBytesForLength(m_txDataLength);
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int totalTxs = 2*(totalLength + minBytesPerTx() - 1)/minBytesPerTx();
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m_spectrumHistoryFixed.resize(totalTxs*maxFramesPerTx());
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} else {
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// variable payload length
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m_recordedAmplitude.resize(kMaxRecordedFrames*kMaxSamplesPerFrame);
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}
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if (m_sampleSizeBytesInp == 0) {
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throw std::runtime_error("Invalid or unsupported capture sample format");
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}
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if (m_sampleSizeBytesOut == 0) {
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throw std::runtime_error("Invalid or unsupported playback sample format");
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}
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if (parameters.samplesPerFrame > kMaxSamplesPerFrame) {
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throw std::runtime_error("Invalid samples per frame");
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}
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if (m_sampleRateInp < kSampleRateMin) {
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fprintf(stderr, "Error: capture sample rate (%g Hz) must be >= %g Hz\n", m_sampleRateInp, kSampleRateMin);
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throw std::runtime_error("Invalid capture/playback sample rate");
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}
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if (m_sampleRateInp > kSampleRateMax) {
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fprintf(stderr, "Error: capture sample rate (%g Hz) must be <= %g Hz\n", m_sampleRateInp, kSampleRateMax);
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throw std::runtime_error("Invalid capture/playback sample rate");
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}
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init("", getDefaultTxProtocol(), 0);
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}
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GGWave::~GGWave() {
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}
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bool GGWave::init(const std::string & text, const int volume) {
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return init(text.size(), text.data(), getDefaultTxProtocol(), volume);
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}
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bool GGWave::init(const std::string & text, const TxProtocol & txProtocol, const int volume) {
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return init(text.size(), text.data(), txProtocol, volume);
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}
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bool GGWave::init(int dataSize, const char * dataBuffer, const int volume) {
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return init(dataSize, dataBuffer, getDefaultTxProtocol(), volume);
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}
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bool GGWave::init(int dataSize, const char * dataBuffer, const TxProtocol & txProtocol, const int volume) {
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if (dataSize < 0) {
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fprintf(stderr, "Negative data size: %d\n", dataSize);
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return false;
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}
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auto maxLength = m_isFixedPayloadLength ? m_payloadLength : kMaxLengthVarible;
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if (dataSize > maxLength) {
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fprintf(stderr, "Truncating data from %d to %d bytes\n", dataSize, maxLength);
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dataSize = maxLength;
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}
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if (volume < 0 || volume > 100) {
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fprintf(stderr, "Invalid volume: %d\n", volume);
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return false;
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}
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m_txProtocol = txProtocol;
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m_txDataLength = dataSize;
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m_sendVolume = ((double)(volume))/100.0f;
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const uint8_t * text = reinterpret_cast<const uint8_t *>(dataBuffer);
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m_hasNewTxData = false;
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std::fill(m_txData.begin(), m_txData.end(), 0);
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std::fill(m_txDataEncoded.begin(), m_txDataEncoded.end(), 0);
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if (m_txDataLength > 0) {
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m_txData[0] = m_txDataLength;
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for (int i = 0; i < m_txDataLength; ++i) m_txData[i + 1] = text[i];
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m_hasNewTxData = true;
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}
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if (m_isFixedPayloadLength) {
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m_txDataLength = m_payloadLength;
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}
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// Rx
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m_receivingData = false;
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m_analyzingData = false;
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m_framesToAnalyze = 0;
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m_framesLeftToAnalyze = 0;
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m_framesToRecord = 0;
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m_framesLeftToRecord = 0;
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std::fill(m_sampleSpectrum.begin(), m_sampleSpectrum.end(), 0);
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std::fill(m_sampleAmplitude.begin(), m_sampleAmplitude.end(), 0);
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for (auto & s : m_sampleAmplitudeHistory) {
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s.resize(kMaxSamplesPerFrame);
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std::fill(s.begin(), s.end(), 0);
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}
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std::fill(m_rxData.begin(), m_rxData.end(), 0);
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for (int i = 0; i < m_samplesPerFrame; ++i) {
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m_fftOut[2*i + 0] = 0.0f;
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m_fftOut[2*i + 1] = 0.0f;
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}
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for (auto & s : m_spectrumHistoryFixed) {
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s.resize(kMaxSamplesPerFrame);
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std::fill(s.begin(), s.end(), 0);
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}
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return true;
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}
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uint32_t GGWave::encodeSize_bytes() const {
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return encodeSize_samples()*m_sampleSizeBytesOut;
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}
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uint32_t GGWave::encodeSize_samples() const {
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if (m_hasNewTxData == false) {
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return 0;
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}
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float factor = 1.0f;
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int samplesPerFrameOut = m_samplesPerFrame;
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if (m_sampleRateOut != kBaseSampleRate) {
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factor = kBaseSampleRate/m_sampleRateOut;
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// note : +1 extra sample in order to overestimate the buffer size
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|
samplesPerFrameOut = m_impl->resampler.resample(factor, m_samplesPerFrame, m_outputBlock.data(), nullptr) + 1;
|
|
}
|
|
int nECCBytesPerTx = getECCBytesForLength(m_txDataLength);
|
|
int sendDataLength = m_txDataLength + m_encodedDataOffset;
|
|
int totalBytes = sendDataLength + nECCBytesPerTx;
|
|
int totalDataFrames = ((totalBytes + m_txProtocol.bytesPerTx - 1)/m_txProtocol.bytesPerTx)*m_txProtocol.framesPerTx;
|
|
|
|
return (
|
|
m_nMarkerFrames + totalDataFrames + m_nMarkerFrames
|
|
)*samplesPerFrameOut;
|
|
}
|
|
|
|
bool GGWave::encode(const CBWaveformOut & cbWaveformOut) {
|
|
int frameId = 0;
|
|
|
|
m_impl->resampler.reset();
|
|
|
|
std::vector<double> phaseOffsets(kMaxDataBits);
|
|
|
|
for (int k = 0; k < (int) phaseOffsets.size(); ++k) {
|
|
phaseOffsets[k] = (M_PI*k)/(m_txProtocol.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);
|
|
|
|
std::vector<bool> dataBits(kMaxDataBits);
|
|
|
|
std::vector<AmplitudeData> bit1Amplitude(kMaxDataBits);
|
|
std::vector<AmplitudeData> bit0Amplitude(kMaxDataBits);
|
|
|
|
for (int k = 0; k < (int) dataBits.size(); ++k) {
|
|
double freq = bitFreq(m_txProtocol, k);
|
|
|
|
bit1Amplitude[k].resize(kMaxSamplesPerFrame);
|
|
bit0Amplitude[k].resize(kMaxSamplesPerFrame);
|
|
|
|
double phaseOffset = phaseOffsets[k];
|
|
double curHzPerSample = m_hzPerSample;
|
|
double curIHzPerSample = 1.0/curHzPerSample;
|
|
for (int i = 0; i < m_samplesPerFrame; i++) {
|
|
double curi = i;
|
|
bit1Amplitude[k][i] = std::sin((2.0*M_PI)*(curi*m_isamplesPerFrame)*(freq*curIHzPerSample) + phaseOffset);
|
|
}
|
|
for (int i = 0; i < m_samplesPerFrame; i++) {
|
|
double curi = i;
|
|
bit0Amplitude[k][i] = std::sin((2.0*M_PI)*(curi*m_isamplesPerFrame)*((freq + m_hzPerSample*m_freqDelta_bin)*curIHzPerSample) + phaseOffset);
|
|
}
|
|
}
|
|
|
|
int nECCBytesPerTx = getECCBytesForLength(m_txDataLength);
|
|
int sendDataLength = m_txDataLength + m_encodedDataOffset;
|
|
int totalBytes = sendDataLength + nECCBytesPerTx;
|
|
int totalDataFrames = 2*((totalBytes + m_txProtocol.bytesPerTx - 1)/m_txProtocol.bytesPerTx)*m_txProtocol.framesPerTx;
|
|
|
|
if (m_isFixedPayloadLength == false) {
|
|
RS::ReedSolomon rsLength(1, m_encodedDataOffset - 1);
|
|
rsLength.Encode(m_txData.data(), m_txDataEncoded.data());
|
|
}
|
|
|
|
// first byte of m_txData contains the length of the payload, so we skip it:
|
|
RS::ReedSolomon rsData = RS::ReedSolomon(m_txDataLength, nECCBytesPerTx);
|
|
rsData.Encode(m_txData.data() + 1, m_txDataEncoded.data() + m_encodedDataOffset);
|
|
|
|
float factor = kBaseSampleRate/m_sampleRateOut;
|
|
uint32_t offset = 0;
|
|
|
|
m_waveformTones.clear();
|
|
|
|
while (m_hasNewTxData) {
|
|
std::fill(m_outputBlock.begin(), m_outputBlock.end(), 0.0f);
|
|
|
|
std::uint16_t nFreq = 0;
|
|
m_waveformTones.push_back({});
|
|
|
|
if (frameId < m_nMarkerFrames) {
|
|
nFreq = m_nBitsInMarker;
|
|
|
|
for (int i = 0; i < m_nBitsInMarker; ++i) {
|
|
m_waveformTones.back().push_back({});
|
|
m_waveformTones.back().back().duration_ms = (1000.0*m_samplesPerFrame)/kBaseSampleRate;
|
|
if (i%2 == 0) {
|
|
::addAmplitudeSmooth(bit1Amplitude[i], m_outputBlock, m_sendVolume, 0, m_samplesPerFrame, frameId, m_nMarkerFrames);
|
|
m_waveformTones.back().back().freq_hz = bitFreq(m_txProtocol, i);
|
|
} else {
|
|
::addAmplitudeSmooth(bit0Amplitude[i], m_outputBlock, m_sendVolume, 0, m_samplesPerFrame, frameId, m_nMarkerFrames);
|
|
m_waveformTones.back().back().freq_hz = bitFreq(m_txProtocol, i) + m_hzPerSample;
|
|
}
|
|
}
|
|
} else if (frameId < m_nMarkerFrames + totalDataFrames) {
|
|
int dataOffset = frameId - m_nMarkerFrames;
|
|
int cycleModMain = dataOffset%m_txProtocol.framesPerTx;
|
|
dataOffset /= m_txProtocol.framesPerTx;
|
|
dataOffset *= m_txProtocol.bytesPerTx;
|
|
|
|
std::fill(dataBits.begin(), dataBits.end(), 0);
|
|
|
|
for (int j = 0; j < m_txProtocol.bytesPerTx; ++j) {
|
|
if (dataOffset % 2 == 0) {
|
|
uint8_t d = m_txDataEncoded[dataOffset/2 + j] & 15;
|
|
dataBits[(2*j + 0)*16 + d] = 1;
|
|
} else {
|
|
uint8_t d = m_txDataEncoded[dataOffset/2 + j] & 240;
|
|
dataBits[(2*j + 0)*16 + (d >> 4)] = 1;
|
|
}
|
|
}
|
|
|
|
for (int k = 0; k < 2*m_txProtocol.bytesPerTx*16; ++k) {
|
|
if (dataBits[k] == 0) continue;
|
|
|
|
++nFreq;
|
|
m_waveformTones.back().push_back({});
|
|
m_waveformTones.back().back().duration_ms = (1000.0*m_samplesPerFrame)/kBaseSampleRate;
|
|
if (k%2) {
|
|
::addAmplitudeSmooth(bit0Amplitude[k/2], m_outputBlock, m_sendVolume, 0, m_samplesPerFrame, cycleModMain, m_txProtocol.framesPerTx);
|
|
m_waveformTones.back().back().freq_hz = bitFreq(m_txProtocol, k/2) + m_hzPerSample;
|
|
//printf("frameId = %d, freq = %g\n", frameId, m_waveformTones.back().back().freq_hz);
|
|
} else {
|
|
::addAmplitudeSmooth(bit1Amplitude[k/2], m_outputBlock, m_sendVolume, 0, m_samplesPerFrame, cycleModMain, m_txProtocol.framesPerTx);
|
|
m_waveformTones.back().back().freq_hz = bitFreq(m_txProtocol, k/2);
|
|
//printf("frameId = %d, freq = %g\n", frameId, m_waveformTones.back().back().freq_hz);
|
|
}
|
|
}
|
|
} else if (frameId < m_nMarkerFrames + totalDataFrames + m_nMarkerFrames) {
|
|
nFreq = m_nBitsInMarker;
|
|
|
|
int fId = frameId - (m_nMarkerFrames + totalDataFrames);
|
|
for (int i = 0; i < m_nBitsInMarker; ++i) {
|
|
m_waveformTones.back().push_back({});
|
|
m_waveformTones.back().back().duration_ms = (1000.0*m_samplesPerFrame)/kBaseSampleRate;
|
|
if (i%2 == 0) {
|
|
addAmplitudeSmooth(bit0Amplitude[i], m_outputBlock, m_sendVolume, 0, m_samplesPerFrame, fId, m_nMarkerFrames);
|
|
m_waveformTones.back().back().freq_hz = bitFreq(m_txProtocol, i) + m_hzPerSample;
|
|
} else {
|
|
addAmplitudeSmooth(bit1Amplitude[i], m_outputBlock, m_sendVolume, 0, m_samplesPerFrame, fId, m_nMarkerFrames);
|
|
m_waveformTones.back().back().freq_hz = bitFreq(m_txProtocol, i);
|
|
}
|
|
}
|
|
} else {
|
|
m_hasNewTxData = false;
|
|
break;
|
|
}
|
|
|
|
if (nFreq == 0) nFreq = 1;
|
|
float scale = 1.0f/nFreq;
|
|
for (int i = 0; i < m_samplesPerFrame; ++i) {
|
|
m_outputBlock[i] *= scale;
|
|
}
|
|
|
|
int samplesPerFrameOut = m_samplesPerFrame;
|
|
if (m_sampleRateOut != kBaseSampleRate) {
|
|
samplesPerFrameOut = m_impl->resampler.resample(factor, m_samplesPerFrame, m_outputBlock.data(), m_outputBlockResampled.data());
|
|
} else {
|
|
m_outputBlockResampled = m_outputBlock;
|
|
}
|
|
|
|
// default output is in 16-bit signed int so we always compute it
|
|
for (int i = 0; i < samplesPerFrameOut; ++i) {
|
|
m_outputBlockI16[offset + i] = 32768*m_outputBlockResampled[i];
|
|
}
|
|
|
|
// convert from 32-bit float
|
|
switch (m_sampleFormatOut) {
|
|
case GGWAVE_SAMPLE_FORMAT_UNDEFINED: break;
|
|
case GGWAVE_SAMPLE_FORMAT_U8:
|
|
{
|
|
auto p = reinterpret_cast<uint8_t *>(m_outputBlockTmp.data());
|
|
for (int i = 0; i < samplesPerFrameOut; ++i) {
|
|
p[offset + i] = 128*(m_outputBlockResampled[i] + 1.0f);
|
|
}
|
|
} break;
|
|
case GGWAVE_SAMPLE_FORMAT_I8:
|
|
{
|
|
auto p = reinterpret_cast<uint8_t *>(m_outputBlockTmp.data());
|
|
for (int i = 0; i < samplesPerFrameOut; ++i) {
|
|
p[offset + i] = 128*m_outputBlockResampled[i];
|
|
}
|
|
} break;
|
|
case GGWAVE_SAMPLE_FORMAT_U16:
|
|
{
|
|
auto p = reinterpret_cast<uint16_t *>(m_outputBlockTmp.data());
|
|
for (int i = 0; i < samplesPerFrameOut; ++i) {
|
|
p[offset + i] = 32768*(m_outputBlockResampled[i] + 1.0f);
|
|
}
|
|
} break;
|
|
case GGWAVE_SAMPLE_FORMAT_I16:
|
|
{
|
|
// skip because we already have the data in m_outputBlockI16
|
|
//auto p = reinterpret_cast<uint16_t *>(m_outputBlockTmp.data());
|
|
//for (int i = 0; i < samplesPerFrameOut; ++i) {
|
|
// p[offset + i] = 32768*m_outputBlockResampled[i];
|
|
//}
|
|
} break;
|
|
case GGWAVE_SAMPLE_FORMAT_F32:
|
|
{
|
|
auto p = reinterpret_cast<float *>(m_outputBlockTmp.data());
|
|
for (int i = 0; i < samplesPerFrameOut; ++i) {
|
|
p[offset + i] = m_outputBlockResampled[i];
|
|
}
|
|
} break;
|
|
}
|
|
|
|
++frameId;
|
|
offset += samplesPerFrameOut;
|
|
}
|
|
|
|
switch (m_sampleFormatOut) {
|
|
case GGWAVE_SAMPLE_FORMAT_UNDEFINED: break;
|
|
case GGWAVE_SAMPLE_FORMAT_I16:
|
|
{
|
|
cbWaveformOut(m_outputBlockI16.data(), offset*m_sampleSizeBytesOut);
|
|
} break;
|
|
case GGWAVE_SAMPLE_FORMAT_U8:
|
|
case GGWAVE_SAMPLE_FORMAT_I8:
|
|
case GGWAVE_SAMPLE_FORMAT_U16:
|
|
case GGWAVE_SAMPLE_FORMAT_F32:
|
|
{
|
|
cbWaveformOut(m_outputBlockTmp.data(), offset*m_sampleSizeBytesOut);
|
|
} break;
|
|
}
|
|
|
|
m_txAmplitudeDataI16.resize(offset);
|
|
for (uint32_t i = 0; i < offset; ++i) {
|
|
m_txAmplitudeDataI16[i] = m_outputBlockI16[i];
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void GGWave::decode(const CBWaveformInp & cbWaveformInp) {
|
|
while (m_hasNewTxData == false) {
|
|
// read capture data
|
|
float factor = m_sampleRateInp/kBaseSampleRate;
|
|
uint32_t nBytesNeeded = m_samplesNeeded*m_sampleSizeBytesInp;
|
|
|
|
if (m_sampleRateInp != kBaseSampleRate) {
|
|
// note : predict 4 extra samples just to make sure we have enough data
|
|
nBytesNeeded = (m_impl->resampler.resample(1.0f/factor, m_samplesNeeded, m_sampleAmplitudeResampled.data(), nullptr) + 4)*m_sampleSizeBytesInp;
|
|
}
|
|
|
|
uint32_t nBytesRecorded = 0;
|
|
|
|
switch (m_sampleFormatInp) {
|
|
case GGWAVE_SAMPLE_FORMAT_UNDEFINED: break;
|
|
case GGWAVE_SAMPLE_FORMAT_U8:
|
|
case GGWAVE_SAMPLE_FORMAT_I8:
|
|
case GGWAVE_SAMPLE_FORMAT_U16:
|
|
case GGWAVE_SAMPLE_FORMAT_I16:
|
|
{
|
|
nBytesRecorded = cbWaveformInp(m_sampleAmplitudeTmp.data(), nBytesNeeded);
|
|
} break;
|
|
case GGWAVE_SAMPLE_FORMAT_F32:
|
|
{
|
|
nBytesRecorded = cbWaveformInp(m_sampleAmplitudeResampled.data(), nBytesNeeded);
|
|
} break;
|
|
}
|
|
|
|
if (nBytesRecorded % m_sampleSizeBytesInp != 0) {
|
|
fprintf(stderr, "Failure during capture - provided bytes (%d) are not multiple of sample size (%d)\n",
|
|
nBytesRecorded, m_sampleSizeBytesInp);
|
|
m_samplesNeeded = m_samplesPerFrame;
|
|
break;
|
|
}
|
|
|
|
if (nBytesRecorded > nBytesNeeded) {
|
|
fprintf(stderr, "Failure during capture - more samples were provided (%d) than requested (%d)\n",
|
|
nBytesRecorded/m_sampleSizeBytesInp, nBytesNeeded/m_sampleSizeBytesInp);
|
|
m_samplesNeeded = m_samplesPerFrame;
|
|
break;
|
|
}
|
|
|
|
// convert to 32-bit float
|
|
int nSamplesRecorded = nBytesRecorded/m_sampleSizeBytesInp;
|
|
switch (m_sampleFormatInp) {
|
|
case GGWAVE_SAMPLE_FORMAT_UNDEFINED: break;
|
|
case GGWAVE_SAMPLE_FORMAT_U8:
|
|
{
|
|
constexpr float scale = 1.0f/128;
|
|
auto p = reinterpret_cast<uint8_t *>(m_sampleAmplitudeTmp.data());
|
|
for (int i = 0; i < nSamplesRecorded; ++i) {
|
|
m_sampleAmplitudeResampled[i] = float(int16_t(*(p + i)) - 128)*scale;
|
|
}
|
|
} break;
|
|
case GGWAVE_SAMPLE_FORMAT_I8:
|
|
{
|
|
constexpr float scale = 1.0f/128;
|
|
auto p = reinterpret_cast<int8_t *>(m_sampleAmplitudeTmp.data());
|
|
for (int i = 0; i < nSamplesRecorded; ++i) {
|
|
m_sampleAmplitudeResampled[i] = float(*(p + i))*scale;
|
|
}
|
|
} break;
|
|
case GGWAVE_SAMPLE_FORMAT_U16:
|
|
{
|
|
constexpr float scale = 1.0f/32768;
|
|
auto p = reinterpret_cast<uint16_t *>(m_sampleAmplitudeTmp.data());
|
|
for (int i = 0; i < nSamplesRecorded; ++i) {
|
|
m_sampleAmplitudeResampled[i] = float(int32_t(*(p + i)) - 32768)*scale;
|
|
}
|
|
} break;
|
|
case GGWAVE_SAMPLE_FORMAT_I16:
|
|
{
|
|
constexpr float scale = 1.0f/32768;
|
|
auto p = reinterpret_cast<int16_t *>(m_sampleAmplitudeTmp.data());
|
|
for (int i = 0; i < nSamplesRecorded; ++i) {
|
|
m_sampleAmplitudeResampled[i] = float(*(p + i))*scale;
|
|
}
|
|
} break;
|
|
case GGWAVE_SAMPLE_FORMAT_F32: break;
|
|
}
|
|
|
|
if (nSamplesRecorded == 0) {
|
|
break;
|
|
}
|
|
|
|
uint32_t offset = m_samplesPerFrame - m_samplesNeeded;
|
|
|
|
if (m_sampleRateInp != kBaseSampleRate) {
|
|
if (nSamplesRecorded <= 2*Resampler::kWidth) {
|
|
m_samplesNeeded = m_samplesPerFrame;
|
|
break;
|
|
}
|
|
|
|
// reset resampler state every minute
|
|
if (!m_receivingData && m_impl->resampler.nSamplesTotal() > 60.0f*factor*kBaseSampleRate) {
|
|
m_impl->resampler.reset();
|
|
}
|
|
|
|
int nSamplesResampled = offset + m_impl->resampler.resample(factor, nSamplesRecorded, m_sampleAmplitudeResampled.data(), m_sampleAmplitude.data() + offset);
|
|
nSamplesRecorded = nSamplesResampled;
|
|
} else {
|
|
for (int i = 0; i < nSamplesRecorded; ++i) {
|
|
m_sampleAmplitude[offset + i] = m_sampleAmplitudeResampled[i];
|
|
}
|
|
}
|
|
|
|
// we have enough bytes to do analysis
|
|
if (nSamplesRecorded >= m_samplesPerFrame) {
|
|
m_hasNewAmplitude = true;
|
|
|
|
if (m_isFixedPayloadLength) {
|
|
decode_fixed();
|
|
} else {
|
|
decode_variable();
|
|
}
|
|
|
|
int nExtraSamples = nSamplesRecorded - m_samplesPerFrame;
|
|
for (int i = 0; i < nExtraSamples; ++i) {
|
|
m_sampleAmplitude[i] = m_sampleAmplitude[m_samplesPerFrame + i];
|
|
}
|
|
|
|
m_samplesNeeded = m_samplesPerFrame - nExtraSamples;
|
|
} else {
|
|
m_samplesNeeded = m_samplesPerFrame - nSamplesRecorded;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool GGWave::takeTxAmplitudeI16(AmplitudeDataI16 & dst) {
|
|
if (m_txAmplitudeDataI16.size() == 0) return false;
|
|
|
|
dst = std::move(m_txAmplitudeDataI16);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool GGWave::stopReceiving() {
|
|
if (m_receivingData == false) {
|
|
return false;
|
|
}
|
|
|
|
m_receivingData = false;
|
|
|
|
return true;
|
|
}
|
|
|
|
int GGWave::takeRxData(TxRxData & dst) {
|
|
if (m_lastRxDataLength == 0) return 0;
|
|
|
|
auto res = m_lastRxDataLength;
|
|
m_lastRxDataLength = 0;
|
|
|
|
if (res != -1) {
|
|
dst = m_rxData;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
bool GGWave::takeRxSpectrum(SpectrumData & dst) {
|
|
if (m_hasNewSpectrum == false) return false;
|
|
|
|
m_hasNewSpectrum = false;
|
|
dst = m_sampleSpectrum;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool GGWave::takeRxAmplitude(AmplitudeData & dst) {
|
|
if (m_hasNewAmplitude == false) return false;
|
|
|
|
m_hasNewAmplitude = false;
|
|
dst = m_sampleAmplitude;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool GGWave::computeFFTR(const float * src, float * dst, int N, float d) {
|
|
if (N > kMaxSamplesPerFrame) {
|
|
fprintf(stderr, "computeFFTR: N (%d) must be <= %d\n", N, GGWave::kMaxSamplesPerFrame);
|
|
return false;
|
|
}
|
|
|
|
FFT(src, dst, N, d);
|
|
|
|
return true;
|
|
}
|
|
|
|
//
|
|
// Variable payload length
|
|
//
|
|
|
|
void GGWave::decode_variable() {
|
|
m_sampleAmplitudeHistory[m_historyId] = m_sampleAmplitude;
|
|
|
|
if (++m_historyId >= kMaxSpectrumHistory) {
|
|
m_historyId = 0;
|
|
}
|
|
|
|
if (m_historyId == 0 || m_receivingData) {
|
|
m_hasNewSpectrum = true;
|
|
|
|
std::fill(m_sampleAmplitudeAverage.begin(), m_sampleAmplitudeAverage.end(), 0.0f);
|
|
for (auto & s : m_sampleAmplitudeHistory) {
|
|
for (int i = 0; i < m_samplesPerFrame; ++i) {
|
|
m_sampleAmplitudeAverage[i] += s[i];
|
|
}
|
|
}
|
|
|
|
float norm = 1.0f/kMaxSpectrumHistory;
|
|
for (int i = 0; i < m_samplesPerFrame; ++i) {
|
|
m_sampleAmplitudeAverage[i] *= norm;
|
|
}
|
|
|
|
// calculate spectrum
|
|
FFT(m_sampleAmplitudeAverage.data(), m_fftOut.data(), m_samplesPerFrame, 1.0);
|
|
|
|
for (int i = 0; i < m_samplesPerFrame; ++i) {
|
|
m_sampleSpectrum[i] = (m_fftOut[2*i + 0]*m_fftOut[2*i + 0] + m_fftOut[2*i + 1]*m_fftOut[2*i + 1]);
|
|
}
|
|
for (int i = 1; i < m_samplesPerFrame/2; ++i) {
|
|
m_sampleSpectrum[i] += m_sampleSpectrum[m_samplesPerFrame - i];
|
|
}
|
|
}
|
|
|
|
if (m_framesLeftToRecord > 0) {
|
|
std::copy(m_sampleAmplitude.begin(),
|
|
m_sampleAmplitude.begin() + m_samplesPerFrame,
|
|
m_recordedAmplitude.data() + (m_framesToRecord - m_framesLeftToRecord)*m_samplesPerFrame);
|
|
|
|
if (--m_framesLeftToRecord <= 0) {
|
|
m_analyzingData = true;
|
|
}
|
|
}
|
|
|
|
if (m_analyzingData) {
|
|
fprintf(stderr, "Analyzing captured data ..\n");
|
|
auto tStart = std::chrono::high_resolution_clock::now();
|
|
|
|
const int stepsPerFrame = 16;
|
|
const int step = m_samplesPerFrame/stepsPerFrame;
|
|
|
|
bool isValid = false;
|
|
for (const auto & rxProtocolPair : m_rxProtocols) {
|
|
const auto & rxProtocolId = rxProtocolPair.first;
|
|
const auto & rxProtocol = rxProtocolPair.second;
|
|
|
|
// skip Rx protocol if start frequency is different from detected one
|
|
if (rxProtocol.freqStart != m_markerFreqStart) {
|
|
continue;
|
|
}
|
|
|
|
std::fill(m_sampleSpectrum.begin(), m_sampleSpectrum.end(), 0.0f);
|
|
|
|
m_framesToAnalyze = m_nMarkerFrames*stepsPerFrame;
|
|
m_framesLeftToAnalyze = m_framesToAnalyze;
|
|
|
|
// note : not sure if looping backwards here is more meaningful than looping forwards
|
|
for (int ii = m_nMarkerFrames*stepsPerFrame - 1; ii >= 0; --ii) {
|
|
bool knownLength = false;
|
|
|
|
int decodedLength = 0;
|
|
const int offsetStart = ii;
|
|
for (int itx = 0; itx < 1024; ++itx) {
|
|
int offsetTx = offsetStart + itx*rxProtocol.framesPerTx*stepsPerFrame;
|
|
if (offsetTx >= m_recvDuration_frames*stepsPerFrame || (itx + 1)*rxProtocol.bytesPerTx >= (int) m_txDataEncoded.size()) {
|
|
break;
|
|
}
|
|
|
|
std::copy(
|
|
m_recordedAmplitude.begin() + offsetTx*step,
|
|
m_recordedAmplitude.begin() + offsetTx*step + m_samplesPerFrame, m_fftInp.data());
|
|
|
|
// note : should we skip the first and last frame here as they are amplitude-smoothed?
|
|
for (int k = 1; k < rxProtocol.framesPerTx; ++k) {
|
|
for (int i = 0; i < m_samplesPerFrame; ++i) {
|
|
m_fftInp[i] += m_recordedAmplitude[(offsetTx + k*stepsPerFrame)*step + i];
|
|
}
|
|
}
|
|
|
|
FFT(m_fftInp.data(), m_fftOut.data(), m_samplesPerFrame, 1.0);
|
|
|
|
for (int i = 0; i < m_samplesPerFrame; ++i) {
|
|
m_sampleSpectrum[i] = (m_fftOut[2*i + 0]*m_fftOut[2*i + 0] + m_fftOut[2*i + 1]*m_fftOut[2*i + 1]);
|
|
}
|
|
for (int i = 1; i < m_samplesPerFrame/2; ++i) {
|
|
m_sampleSpectrum[i] += m_sampleSpectrum[m_samplesPerFrame - i];
|
|
}
|
|
|
|
uint8_t curByte = 0;
|
|
for (int i = 0; i < 2*rxProtocol.bytesPerTx; ++i) {
|
|
double freq = m_hzPerSample*rxProtocol.freqStart;
|
|
int bin = std::round(freq*m_ihzPerSample) + 16*i;
|
|
|
|
int kmax = 0;
|
|
double amax = 0.0;
|
|
for (int k = 0; k < 16; ++k) {
|
|
if (m_sampleSpectrum[bin + k] > amax) {
|
|
kmax = k;
|
|
amax = m_sampleSpectrum[bin + k];
|
|
}
|
|
}
|
|
|
|
if (i%2) {
|
|
curByte += (kmax << 4);
|
|
m_txDataEncoded[itx*rxProtocol.bytesPerTx + i/2] = curByte;
|
|
curByte = 0;
|
|
} else {
|
|
curByte = kmax;
|
|
}
|
|
}
|
|
|
|
if (itx*rxProtocol.bytesPerTx > m_encodedDataOffset && knownLength == false) {
|
|
RS::ReedSolomon rsLength(1, m_encodedDataOffset - 1);
|
|
if ((rsLength.Decode(m_txDataEncoded.data(), m_rxData.data()) == 0) && (m_rxData[0] > 0 && m_rxData[0] <= 140)) {
|
|
knownLength = true;
|
|
decodedLength = m_rxData[0];
|
|
|
|
const int nTotalBytesExpected = m_encodedDataOffset + decodedLength + ::getECCBytesForLength(decodedLength);
|
|
const int nTotalFramesExpected = 2*m_nMarkerFrames + ((nTotalBytesExpected + rxProtocol.bytesPerTx - 1)/rxProtocol.bytesPerTx)*rxProtocol.framesPerTx;
|
|
if (m_recvDuration_frames > nTotalFramesExpected ||
|
|
m_recvDuration_frames < nTotalFramesExpected - 2*m_nMarkerFrames) {
|
|
knownLength = false;
|
|
break;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
{
|
|
const int nTotalBytesExpected = m_encodedDataOffset + decodedLength + ::getECCBytesForLength(decodedLength);
|
|
if (knownLength && itx*rxProtocol.bytesPerTx > nTotalBytesExpected + 1) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (knownLength) {
|
|
RS::ReedSolomon rsData(decodedLength, ::getECCBytesForLength(decodedLength));
|
|
|
|
if (rsData.Decode(m_txDataEncoded.data() + m_encodedDataOffset, m_rxData.data()) == 0) {
|
|
if (m_rxData[0] != 0) {
|
|
std::string s((char *) m_rxData.data(), decodedLength);
|
|
|
|
fprintf(stderr, "Decoded length = %d, protocol = '%s' (%d)\n", decodedLength, rxProtocol.name, rxProtocolId);
|
|
fprintf(stderr, "Received sound data successfully: '%s'\n", s.c_str());
|
|
|
|
isValid = true;
|
|
m_hasNewRxData = true;
|
|
m_lastRxDataLength = decodedLength;
|
|
m_rxProtocol = rxProtocol;
|
|
m_rxProtocolId = TxProtocolId(rxProtocolId);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (isValid) {
|
|
break;
|
|
}
|
|
--m_framesLeftToAnalyze;
|
|
}
|
|
|
|
if (isValid) break;
|
|
}
|
|
|
|
m_framesToRecord = 0;
|
|
|
|
if (isValid == false) {
|
|
fprintf(stderr, "Failed to capture sound data. Please try again (length = %d)\n", m_rxData[0]);
|
|
m_lastRxDataLength = -1;
|
|
m_framesToRecord = -1;
|
|
}
|
|
|
|
m_receivingData = false;
|
|
m_analyzingData = false;
|
|
|
|
std::fill(m_sampleSpectrum.begin(), m_sampleSpectrum.end(), 0.0f);
|
|
|
|
m_framesToAnalyze = 0;
|
|
m_framesLeftToAnalyze = 0;
|
|
|
|
auto tEnd = std::chrono::high_resolution_clock::now();
|
|
fprintf(stderr, "Time to analyze: %g ms\n", getTime_ms(tStart, tEnd));
|
|
}
|
|
|
|
// check if receiving data
|
|
if (m_receivingData == false) {
|
|
bool isReceiving = false;
|
|
|
|
for (const auto & rxProtocol : getTxProtocols()) {
|
|
int nDetectedMarkerBits = m_nBitsInMarker;
|
|
|
|
for (int i = 0; i < m_nBitsInMarker; ++i) {
|
|
double freq = bitFreq(rxProtocol.second, i);
|
|
int bin = std::round(freq*m_ihzPerSample);
|
|
|
|
if (i%2 == 0) {
|
|
if (m_sampleSpectrum[bin] <= m_soundMarkerThreshold*m_sampleSpectrum[bin + m_freqDelta_bin]) --nDetectedMarkerBits;
|
|
} else {
|
|
if (m_sampleSpectrum[bin] >= m_soundMarkerThreshold*m_sampleSpectrum[bin + m_freqDelta_bin]) --nDetectedMarkerBits;
|
|
}
|
|
}
|
|
|
|
if (nDetectedMarkerBits == m_nBitsInMarker) {
|
|
m_markerFreqStart = rxProtocol.second.freqStart;
|
|
isReceiving = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (isReceiving) {
|
|
if (++m_nMarkersSuccess >= 1) {
|
|
} else {
|
|
isReceiving = false;
|
|
}
|
|
} else {
|
|
m_nMarkersSuccess = 0;
|
|
}
|
|
|
|
if (isReceiving) {
|
|
std::time_t timestamp = std::time(nullptr);
|
|
fprintf(stderr, "%sReceiving sound data ...\n", std::asctime(std::localtime(×tamp)));
|
|
|
|
m_receivingData = true;
|
|
std::fill(m_rxData.begin(), m_rxData.end(), 0);
|
|
|
|
// max recieve duration
|
|
m_recvDuration_frames =
|
|
2*m_nMarkerFrames +
|
|
maxFramesPerTx()*((kMaxLengthVarible + ::getECCBytesForLength(kMaxLengthVarible))/minBytesPerTx() + 1);
|
|
|
|
m_nMarkersSuccess = 0;
|
|
m_framesToRecord = m_recvDuration_frames;
|
|
m_framesLeftToRecord = m_recvDuration_frames;
|
|
}
|
|
} else {
|
|
bool isEnded = false;
|
|
|
|
for (const auto & rxProtocol : getTxProtocols()) {
|
|
int nDetectedMarkerBits = m_nBitsInMarker;
|
|
|
|
for (int i = 0; i < m_nBitsInMarker; ++i) {
|
|
double freq = bitFreq(rxProtocol.second, i);
|
|
int bin = std::round(freq*m_ihzPerSample);
|
|
|
|
if (i%2 == 0) {
|
|
if (m_sampleSpectrum[bin] >= m_soundMarkerThreshold*m_sampleSpectrum[bin + m_freqDelta_bin]) nDetectedMarkerBits--;
|
|
} else {
|
|
if (m_sampleSpectrum[bin] <= m_soundMarkerThreshold*m_sampleSpectrum[bin + m_freqDelta_bin]) nDetectedMarkerBits--;
|
|
}
|
|
}
|
|
|
|
if (nDetectedMarkerBits == m_nBitsInMarker) {
|
|
isEnded = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (isEnded) {
|
|
if (++m_nMarkersSuccess >= 1) {
|
|
} else {
|
|
isEnded = false;
|
|
}
|
|
} else {
|
|
m_nMarkersSuccess = 0;
|
|
}
|
|
|
|
if (isEnded && m_framesToRecord > 1) {
|
|
std::time_t timestamp = std::time(nullptr);
|
|
m_recvDuration_frames -= m_framesLeftToRecord - 1;
|
|
fprintf(stderr, "%sReceived end marker. Frames left = %d, recorded = %d\n", std::asctime(std::localtime(×tamp)), m_framesLeftToRecord, m_recvDuration_frames);
|
|
m_nMarkersSuccess = 0;
|
|
m_framesLeftToRecord = 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
//
|
|
// Fixed payload length
|
|
|
|
void GGWave::decode_fixed() {
|
|
m_hasNewSpectrum = true;
|
|
|
|
// calculate spectrum
|
|
FFT(m_sampleAmplitude.data(), m_fftOut.data(), m_samplesPerFrame, 1.0);
|
|
|
|
for (int i = 0; i < m_samplesPerFrame; ++i) {
|
|
m_sampleSpectrum[i] = (m_fftOut[2*i + 0]*m_fftOut[2*i + 0] + m_fftOut[2*i + 1]*m_fftOut[2*i + 1]);
|
|
}
|
|
for (int i = 1; i < m_samplesPerFrame/2; ++i) {
|
|
m_sampleSpectrum[i] += m_sampleSpectrum[m_samplesPerFrame - i];
|
|
}
|
|
|
|
m_spectrumHistoryFixed[m_historyIdFixed] = m_sampleSpectrum;
|
|
|
|
if (++m_historyIdFixed >= (int) m_spectrumHistoryFixed.size()) {
|
|
m_historyIdFixed = 0;
|
|
}
|
|
|
|
bool isValid = false;
|
|
for (const auto & rxProtocolPair : m_rxProtocols) {
|
|
const auto & rxProtocolId = rxProtocolPair.first;
|
|
const auto & rxProtocol = rxProtocolPair.second;
|
|
|
|
const int binStart = rxProtocol.freqStart;
|
|
const int binDelta = 16;
|
|
|
|
const int totalLength = m_payloadLength + getECCBytesForLength(m_payloadLength);
|
|
const int totalTxs = 2*((totalLength + rxProtocol.bytesPerTx - 1)/rxProtocol.bytesPerTx);
|
|
|
|
int historyStartId = m_historyIdFixed - totalTxs*rxProtocol.framesPerTx;
|
|
if (historyStartId < 0) {
|
|
historyStartId += m_spectrumHistoryFixed.size();
|
|
}
|
|
|
|
const int nTones = 2*rxProtocol.bytesPerTx;
|
|
std::vector<int> detectedBins(2*totalLength);
|
|
|
|
struct ToneData {
|
|
int nMax[16];
|
|
};
|
|
|
|
std::vector<ToneData> tones(nTones);
|
|
|
|
bool detectedSignal = true;
|
|
int txDetectedTotal = 0;
|
|
int txNeededTotal = 0;
|
|
for (int k = 0; k < totalTxs; ++k) {
|
|
if (k % 2 == 0) {
|
|
for (auto & tone : tones) {
|
|
std::fill(tone.nMax, tone.nMax + 16, 0);
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < rxProtocol.framesPerTx; ++i) {
|
|
int historyId = historyStartId + k*rxProtocol.framesPerTx + i;
|
|
if (historyId >= (int) m_spectrumHistoryFixed.size()) {
|
|
historyId -= m_spectrumHistoryFixed.size();
|
|
}
|
|
|
|
for (int j = 0; j < rxProtocol.bytesPerTx; ++j) {
|
|
int f0bin = -1;
|
|
int f1bin = -1;
|
|
|
|
double f0max = 0.0;
|
|
double f1max = 0.0;
|
|
|
|
for (int b = 0; b < 16; ++b) {
|
|
{
|
|
const auto & v = m_spectrumHistoryFixed[historyId][binStart + 2*j*binDelta + b];
|
|
|
|
if (f0max <= v) {
|
|
f0max = v;
|
|
f0bin = b;
|
|
}
|
|
}
|
|
|
|
{
|
|
const auto & v = m_spectrumHistoryFixed[historyId][binStart + 2*j*binDelta + b];
|
|
|
|
if (f1max <= v) {
|
|
f1max = v;
|
|
f1bin = b;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (k%2 == 0) tones[2*j + 0].nMax[f0bin]++;
|
|
if (k%2 == 1) tones[2*j + 1].nMax[f1bin]++;
|
|
}
|
|
}
|
|
if (k % 2 == 0) continue;
|
|
|
|
int txDetected = 0;
|
|
int txNeeded = 0;
|
|
for (int j = 0; j < rxProtocol.bytesPerTx; ++j) {
|
|
if ((k/2)*rxProtocol.bytesPerTx + j >= totalLength) break;
|
|
txNeeded += 2;
|
|
for (int b = 0; b < 16; ++b) {
|
|
if (tones[2*j + 0].nMax[b] > rxProtocol.framesPerTx/2) {
|
|
detectedBins[2*((k/2)*rxProtocol.bytesPerTx + j) + 0] = b;
|
|
txDetected++;
|
|
}
|
|
if (tones[2*j + 1].nMax[b] > rxProtocol.framesPerTx/2) {
|
|
detectedBins[2*((k/2)*rxProtocol.bytesPerTx + j) + 1] = b;
|
|
txDetected++;
|
|
}
|
|
}
|
|
}
|
|
|
|
txDetectedTotal += txDetected;
|
|
txNeededTotal += txNeeded;
|
|
}
|
|
|
|
//if (rxProtocolId == GGWAVE_TX_PROTOCOL_DT_FAST) {
|
|
// printf("detected = %d, needed = %d\n", txDetectedTotal, txNeededTotal);
|
|
//}
|
|
|
|
if (txDetectedTotal < 0.75*txNeededTotal) {
|
|
detectedSignal = false;
|
|
}
|
|
|
|
if (detectedSignal) {
|
|
RS::ReedSolomon rsData(m_payloadLength, getECCBytesForLength(m_payloadLength));
|
|
|
|
for (int j = 0; j < totalLength; ++j) {
|
|
m_txDataEncoded[j] = (detectedBins[2*j + 1] << 4) + detectedBins[2*j + 0];
|
|
}
|
|
|
|
if (rsData.Decode(m_txDataEncoded.data(), m_rxData.data()) == 0) {
|
|
if (m_rxData[0] != 0) {
|
|
std::time_t timestamp = std::time(nullptr);
|
|
std::string tstr = std::asctime(std::localtime(×tamp));
|
|
tstr.back() = 0;
|
|
fprintf(stderr, "[%s] Received: '%s'\n", tstr.c_str(), m_rxData.data());
|
|
|
|
isValid = true;
|
|
m_hasNewRxData = true;
|
|
m_lastRxDataLength = m_payloadLength;
|
|
m_rxProtocol = rxProtocol;
|
|
m_rxProtocolId = TxProtocolId(rxProtocolId);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (isValid) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
int GGWave::maxFramesPerTx() const {
|
|
int res = 0;
|
|
for (const auto & protocol : getTxProtocols()) {
|
|
res = std::max(res, protocol.second.framesPerTx);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
int GGWave::minBytesPerTx() const {
|
|
int res = getTxProtocols().begin()->second.bytesPerTx;
|
|
for (const auto & protocol : getTxProtocols()) {
|
|
res = std::min(res, protocol.second.bytesPerTx);
|
|
}
|
|
return res;
|
|
}
|
|
|