code import
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fsk_minitel.c
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627
fsk_minitel.c
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@ -0,0 +1,627 @@
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <math.h>
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#define __cplusplus__strings__
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#ifndef M_PI
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#define M_PI 3.14159265358979324
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#endif
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#include <sndfile.h>
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//#if defined(WITH_SPANDSP_INTERNALS)
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#define SPANDSP_EXPOSE_INTERNAL_STRUCTURES
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//#endif
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#include "my_fsk.h"
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#include "spandsp.h"
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#include "spandsp-sim.h"
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int16_t tone_amp[160];
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int tone_pos=0;
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typedef struct
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{
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double x, y;
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} tComplex;
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tComplex complexAdd(const tComplex* a, const tComplex* b)
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{
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tComplex c;
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c.x = a->x + b->x;
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c.y = a->y + b->y;
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return c;
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}
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tComplex complexMul(const tComplex* a, const tComplex* b)
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{
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tComplex c;
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c.x = a->x * b->x - a->y * b->y;
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c.y = a->x * b->y + a->y * b->x;
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return c;
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}
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void dft(tComplex out[], const tComplex in[], size_t n, int direction)
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{
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size_t k, i;
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for (k = 0; k < n; k++)
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{
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tComplex r = { 0, 0 }, e;
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for (i = 0; i < n; i++)
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{
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e.x = cos(-2 * direction * M_PI / n * ((double)k - n / 2) * ((double)i - n / 2));
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e.y = sin(-2 * direction * M_PI / n * ((double)k - n / 2) * ((double)i - n / 2));
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e = complexMul(&e, &in[i]);
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r = complexAdd(&r, &e);
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}
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out[k] = r;
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}
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}
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#define FILTER_LENGTH 64
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void TxInit(tTx* pTx,
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uint SampleRate,
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uint (*pTxGetDataCallBack)(tTx*, uint8*))
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{
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memset(pTx, 0, sizeof(*pTx));
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pTx->State = stSendingOnes;
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pTx->SampleRate = SampleRate;
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pTx->OnesFreq = 1300;
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pTx->ZeroesFreq = 2100;
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pTx->BitRate = 1200;
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pTx->pTxGetDataCallBack = pTxGetDataCallBack;
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pTx->SampleCnt = 0;
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pTx->BitSampleCnt = pTx->SampleRate;
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pTx->Data = 0;
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pTx->DataLeft = 0;
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pTx->Phase = 0.0;
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pTx->PhaseIncrement = 2 * M_PI * pTx->OnesFreq / pTx->SampleRate;
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pTx->queue = queue_init(NULL, 128, QUEUE_READ_ATOMIC | QUEUE_WRITE_ATOMIC);
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}
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int16 TxGetSample(tTx* pTx)
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{
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int16 sample;
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float sample1, sample2, mixed;
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if (pTx->State == stSendingOnes &&
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pTx->SampleCnt >= pTx->SampleRate)
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{
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// Sent 1 second worth of 1's, can now send data
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pTx->State = stSendingData;
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}
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if (pTx->State == stSendingData &&
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pTx->BitSampleCnt >= pTx->SampleRate)
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{
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// Another data bit can now be sent
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uint8 d;
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pTx->BitSampleCnt -= pTx->SampleRate;
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if (!pTx->DataLeft)
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{
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// Get the next data byte (if any)
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if (pTx->pTxGetDataCallBack(pTx, &d) != 0)
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{
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pTx->Data = d & 0x7F;
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pTx->Data |= (__builtin_popcount( d & 0x7F ) & 1) << 7; // insert parity
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pTx->Data |= 1 << 8; // insert the stop bit
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pTx->Data <<= 1; // insert the start bit
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pTx->DataLeft = 10;
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}
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else
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{
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pTx->Data = 0x3FF; // no data, send 10 1's
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pTx->DataLeft = 10;
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}
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}
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// Extract the next data bit to send
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d = pTx->Data & 1;
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pTx->Data >>= 1;
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pTx->DataLeft--;
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// Choose the appropriate frequency for 0 and 1
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if (d)
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{
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pTx->PhaseIncrement = 2 * M_PI * pTx->OnesFreq / pTx->SampleRate;
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}
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else
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{
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pTx->PhaseIncrement = 2 * M_PI * pTx->ZeroesFreq / pTx->SampleRate;
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}
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}
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// Generate the next sample, advance the generator's phase
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sample = (int16)(16000 * cos(pTx->Phase));
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pTx->Phase += pTx->PhaseIncrement;
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if (pTx->Phase >= 2 * M_PI)
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{
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pTx->Phase -= 2 * M_PI;
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}
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if (pTx->State == stSendingData)
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{
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pTx->BitSampleCnt += pTx->BitRate;
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}
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pTx->SampleCnt++;
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/*Mix tone*/
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sample1 = sample / 32768.0f;
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sample2 = tone_amp[tone_pos%sizeof(tone_amp)] / 32768.0f;
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mixed = sample1+sample2;
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mixed *= 0.75;
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if (mixed > 1.0f) { mixed = 1.0f ;printf("clip\n"); }
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if (mixed < -1.0f){mixed = -1.0f; printf("clip\n"); }
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tone_pos++;
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return (uint16_t)(mixed * 32768.0f);
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}
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void RxInit(tRx* pRx,
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uint SampleRate,
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void (*pRxGetDataCallBack)(struct tRx*, uint8))
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{
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tComplex tmp[FILTER_LENGTH];
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uint i;
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memset(pRx, 0, sizeof(*pRx));
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pRx->State = stCarrierLost;
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pRx->SampleRate = SampleRate;
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pRx->OnesFreq = 1300;
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pRx->ZeroesFreq = 2100;
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pRx->MidFreq = (pRx->OnesFreq + pRx->ZeroesFreq) / 2;
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pRx->BitRate = 1200;
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pRx->pRxGetDataCallBack = pRxGetDataCallBack;
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pRx->SampleCnt = 0;
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pRx->BitSampleCnt = 0;
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pRx->Data = 0x3FF;
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pRx->Phase = 0.0;
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pRx->PhaseIncrement = 2 * M_PI * pRx->MidFreq / pRx->SampleRate;
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pRx->LastAngle = 0.0;
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pRx->LastDelta = 0;
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pRx->Deltas = 0;
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pRx->CarrierAngle = 0;
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pRx->CarrierCnt = 0;
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pRx->LongAvgPower = 0.0;
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pRx->ShortAvgPower = 0.0;
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pRx->queue = queue_init(rx->queue, 128, QUEUE_READ_ATOMIC | QUEUE_WRITE_ATOMIC);
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for (i = 0; i < FILTER_LENGTH; i++)
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{
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pRx->Delay[i] = 0.0;
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}
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for (i = 0; i < FILTER_LENGTH; i++)
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{
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if (i == 0) // w < 0 (min w)
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{
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pRx->Filter[i].x = 0;
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pRx->Filter[i].y = 0;
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}
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else if (i < FILTER_LENGTH / 2) // w < 0
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{
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pRx->Filter[i].x = 0;
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pRx->Filter[i].y = 0;
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}
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else if (i == FILTER_LENGTH / 2) // w = 0
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{
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pRx->Filter[i].x = 0;
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pRx->Filter[i].y = 0;
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}
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else if (i > FILTER_LENGTH / 2) // w > 0
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{
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pRx->Filter[i].x = 0;
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pRx->Filter[i].y = -1;
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// Extra filter to combat channel noise
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if (i - FILTER_LENGTH / 2 < 875UL * FILTER_LENGTH / pRx->SampleRate ||
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i - FILTER_LENGTH / 2 > (2350UL * FILTER_LENGTH + pRx->SampleRate - 1) / pRx->SampleRate)
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{
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pRx->Filter[i].y = 0;
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}
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}
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}
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memcpy(tmp, pRx->Filter, sizeof(tmp));
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dft(pRx->Filter, tmp, FILTER_LENGTH, -1);
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}
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#define RX_VERBOSE 0
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void RxGetSample(tRx* pRx, int16 Sample)
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{
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tComplex s = { 0.0, 0.0 }, ss;
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double angle;
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uint i;
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int delta;
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double pwr;
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// Insert the sample into the delay line
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memmove(&pRx->Delay[0], &pRx->Delay[1], sizeof(pRx->Delay) - sizeof(pRx->Delay[0]));
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pRx->Delay[FILTER_LENGTH - 1] = Sample;
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// Get the next analytic signal sample by applying Hilbert transform/filter
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for (i = 0; i < FILTER_LENGTH; i++)
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{
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s.x += pRx->Delay[i] * pRx->Filter[FILTER_LENGTH - 1 - i].x;
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s.y += pRx->Delay[i] * pRx->Filter[FILTER_LENGTH - 1 - i].y;
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}
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// Frequency shift by MidFreq down
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ss.x = cos(-pRx->Phase);
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ss.y = sin(-pRx->Phase);
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s = complexMul(&s, &ss);
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pRx->Phase += pRx->PhaseIncrement;
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if (pRx->Phase >= 2 * M_PI)
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{
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pRx->Phase -= 2 * M_PI;
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}
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// Calculate signal power
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pwr = (s.x * s.x + s.y * s.y) / 32768 / 32768;
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pRx->LongAvgPower *= 1 - pRx->BitRate / (pRx->SampleRate * 8.0 * 8);
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pRx->LongAvgPower += pwr;
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pRx->ShortAvgPower *= 1 - pRx->BitRate / (pRx->SampleRate * 8.0);
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pRx->ShortAvgPower += pwr;
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#if 0
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printf("LongAvgPower:%f ShortAvgPower:%f\n", pRx->LongAvgPower, pRx->ShortAvgPower);
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#endif
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// Disconnect if the signal power changes abruptly.
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if (pRx->State != stCarrierLost &&
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pRx->LongAvgPower > pRx->ShortAvgPower * 8 * 8)
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{
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// N.B. The receiver may have received a few extra (garbage) bytes
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// while demodulating the abruptly changed signal.
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// Prefixing data with its size or using a more advanced protocol
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// may be a good solution to this little problem.
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pRx->State = stCarrierLost;
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pRx->BitSampleCnt = 0;
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pRx->Data = 0x3FF;
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pRx->Phase = 0.0;
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pRx->LastAngle = 0.0;
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pRx->LastDelta = 0;
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pRx->Deltas = 0;
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pRx->CarrierAngle = 0;
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pRx->CarrierCnt = 0;
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}
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// Get the phase angle from the analytic signal sample
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angle = (fpclassify(s.x) == FP_ZERO && fpclassify(s.y) == FP_ZERO) ?
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0.0 : 180 / M_PI * atan2(s.y, s.x);
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// Calculate the phase angle change and force it to the -PI to +PI range
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delta = (int)(360.5 + angle - pRx->LastAngle) % 360;
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if (delta > 180) delta -= 360;
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if (pRx->State == stCarrierLost)
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{
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// Accumulate the phase angle change to see if we're receiving 1's
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pRx->CarrierAngle += delta;
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pRx->CarrierCnt++;
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// Check whether or not the phase corresponds to 1's
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if (delta < 0)
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{
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if (pRx->CarrierCnt >= pRx->SampleRate / pRx->OnesFreq * 8)
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{
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double ph = (double)pRx->CarrierAngle / pRx->CarrierCnt;
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#if RX_VERBOSE
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printf("ca:%5ld, cc:%4ld, ca/cc:%4ld\n",
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(long)pRx->CarrierAngle,
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(long)pRx->CarrierCnt,
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(long)(pRx->CarrierAngle / pRx->CarrierCnt));
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#endif
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// Frequency tolerance is +/-16 Hz per the V.23 spec
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if (ph < (pRx->OnesFreq - 17.0 - pRx->MidFreq) * 360.0 / pRx->SampleRate ||
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ph > (pRx->OnesFreq + 17.0 - pRx->MidFreq) * 360.0 / pRx->SampleRate)
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{
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goto BadCarrier;
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}
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}
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}
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else
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{
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BadCarrier:
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// Phase doesn't correspond to 1's
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pRx->CarrierAngle = 0.0;
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pRx->CarrierCnt = 0;
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}
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if (pRx->CarrierCnt >= pRx->SampleRate / 2 + pRx->SampleRate / 4)
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{
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// 0.75 seconds worth of 1's have been detected, ready to receive data
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// Adjust MidFreq to compensate for the DAC and ADC sample rate difference
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double f1 = (double)pRx->CarrierAngle / pRx->CarrierCnt / 360 * pRx->SampleRate + pRx->MidFreq;
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pRx->MidFreq = (uint)(pRx->MidFreq * f1 / pRx->OnesFreq);
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pRx->PhaseIncrement = 2 * M_PI * pRx->MidFreq / pRx->SampleRate;
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#if RX_VERBOSE
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printf("f1:%u, new MidFreq:%u\n", (uint)f1, pRx->MidFreq);
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#endif
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pRx->State = stCarrierDetected;
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}
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}
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else
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{
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// Detect frequency changes (transitions between 0's and 1's)
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int freqChange = ((int32)pRx->LastDelta * delta < 0 || pRx->LastDelta && !delta);
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int reAddDelta = 0;
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#if RX_VERBOSE
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printf("%6lu: delta:%4d freqChange:%d BitSampleCnt:%u\n",
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(ulong)pRx->SampleCnt,
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delta,
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freqChange,
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pRx->BitSampleCnt);
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#endif
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// Synchronize with 1<->0 transitions
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if (freqChange)
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{
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if (pRx->BitSampleCnt >= pRx->SampleRate / 2)
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{
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pRx->BitSampleCnt = pRx->SampleRate;
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pRx->Deltas -= delta;
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reAddDelta = 1;
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}
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else
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{
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pRx->BitSampleCnt = 0;
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pRx->Deltas = 0;
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}
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}
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// Accumulate analytic signal phase angle changes
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// (positive for 0, negative for 1)
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pRx->Deltas += delta;
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if (pRx->BitSampleCnt >= pRx->SampleRate)
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{
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// Another data bit has accumulated
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pRx->BitSampleCnt -= pRx->SampleRate;
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#if RX_VERBOSE
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printf("bit: %u\n", pRx->Deltas < 0);
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#endif
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pRx->Data >>= 1;
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pRx->Data |= (pRx->Deltas < 0) << 9;
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pRx->Deltas = delta * reAddDelta;
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if ((pRx->Data & 0x201) == 0x200)
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{
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// Start and stop bits have been detected
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if (pRx->State == stCarrierDetected)
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{
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pRx->State = stReceivingData;
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}
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pRx->Data = (pRx->Data >> 1) & 0x7F;
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pRx->pRxGetDataCallBack(pRx, (uint8)pRx->Data);
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#if RX_VERBOSE
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printf("byte: 0x%02X ('%c')\n",
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pRx->Data,
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(pRx->Data >= 0x20 && pRx->Data <= 0x7F) ? pRx->Data : '?');
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#endif
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pRx->Data = 0x3FF;
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}
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}
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pRx->BitSampleCnt += pRx->BitRate;
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}
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pRx->LastAngle = angle;
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pRx->LastDelta = delta;
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pRx->SampleCnt++;
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}
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typedef struct
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{
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tTx Tx;
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FILE* DataFile;
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int CountDown;
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} tTxTest;
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uint TxGetDataCallBack(tTx* pTx, uint8* pTxData)
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{
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tTxTest* pTxTest = (tTxTest*)pTx;
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uchar c;
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if (pTxTest->CountDown)
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{
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pTxTest->CountDown--;
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return 0;
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}
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/*
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if (fread(&c, 1, 1, pTxTest->DataFile) != 1)
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{
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pTxTest->CountDown = 20;
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return 0;
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}
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*/
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if( ! queue_empty(pTx->queue)){
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c = queue_read_byte(pTx->queue);
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pTxTest->CountDown = 20;
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}
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*pTxData = c;
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return 1;
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}
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int testTx(uint SampleRate,
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double NoiseLevel,
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const char* DataFileName,
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const char* AudioFileName)
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{
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FILE *fData = NULL;
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SNDFILE *fAudio = NULL;
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//FILE *fAudio = NULL;
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tone_gen_descriptor_t t_desc;
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tone_gen_state_t t_state;
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int err = EXIT_FAILURE;
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tTxTest txTest;
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if ((fData = fopen(DataFileName, "rb")) == NULL)
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{
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printf("Can't open file \"%s\"\n", DataFileName);
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goto Exit;
|
||||
}
|
||||
|
||||
tone_gen_descriptor_init(&t_desc, 1300, -12.0, 0, 0,20, 0, 0, 0, 0);
|
||||
|
||||
tone_gen_init(&t_state, &t_desc);
|
||||
tone_gen(&t_state, tone_amp, sizeof(tone_amp));
|
||||
|
||||
if ((fAudio = sf_open_telephony_write(AudioFileName, 1)) == NULL)
|
||||
// if ((fAudio = fopen(AudioFileName, "wb")) == NULL)
|
||||
{
|
||||
printf("Can't create file \"%s\"\n", AudioFileName);
|
||||
goto Exit;
|
||||
}
|
||||
|
||||
txTest.DataFile = fData;
|
||||
txTest.CountDown = 0;
|
||||
|
||||
TxInit(&txTest.Tx,
|
||||
SampleRate,
|
||||
&TxGetDataCallBack);
|
||||
|
||||
do
|
||||
{
|
||||
int16 sample = TxGetSample(&txTest.Tx);
|
||||
if (txTest.CountDown > 1 && txTest.CountDown <= 10)
|
||||
{
|
||||
#if 0 // Enable this code to test disconnecting.
|
||||
// Finish with silence.
|
||||
|
||||
#endif
|
||||
}
|
||||
//sample += (rand() - (int)RAND_MAX / 2) * NoiseLevel * 16000 / (RAND_MAX / 2);
|
||||
sf_writef_short(fAudio, &sample, 1);
|
||||
//fwrite(&sample, 1, sizeof(sample), fAudio);
|
||||
} while (txTest.CountDown != 1); // Drain all data-containing samples
|
||||
|
||||
err = EXIT_SUCCESS;
|
||||
|
||||
Exit:
|
||||
|
||||
if (fData != NULL) fclose(fData);
|
||||
if (fAudio != NULL)
|
||||
sf_close(fAudio);
|
||||
// fclose(fAudio);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
typedef struct
|
||||
{
|
||||
tRx Rx;
|
||||
FILE* DataFile;
|
||||
} tRxTest;
|
||||
|
||||
void RxGetDataCallBack(tRx* pRx, uint8 RxData)
|
||||
{
|
||||
tRxTest* pRxTest = (tRxTest*)pRx;
|
||||
uchar c = RxData;
|
||||
if (queue_free_space(pRx->queue)){
|
||||
queue_write_byte(pRx->queue, (uint16_t)Rxdata);
|
||||
}
|
||||
//fwrite(&c, 1, 1, pRxTest->DataFile);
|
||||
}
|
||||
|
||||
int testRx(uint SampleRate,
|
||||
const char* AudioFileName,
|
||||
const char* DataFileName)
|
||||
{
|
||||
uint lastState;
|
||||
int err = EXIT_FAILURE;
|
||||
tRxTest rxTest;
|
||||
|
||||
|
||||
RxInit(&rxTest.Rx,
|
||||
8000,//SampleRate,
|
||||
&RxGetDataCallBack);
|
||||
|
||||
for (;;)
|
||||
{
|
||||
int16 sample;
|
||||
|
||||
if (fread(&sample, 1, sizeof(sample), fAudio) != sizeof(sample))
|
||||
{
|
||||
if (rxTest.Rx.State != stCarrierLost) goto NoCarrier;
|
||||
break;
|
||||
}
|
||||
|
||||
lastState = rxTest.Rx.State;
|
||||
RxGetSample(&rxTest.Rx, sample);
|
||||
|
||||
if (rxTest.Rx.State != lastState && rxTest.Rx.State == stCarrierDetected)
|
||||
{
|
||||
printf("\nCONNECT %u\n\n", rxTest.Rx.BitRate);
|
||||
}
|
||||
|
||||
if (rxTest.Rx.State != lastState && rxTest.Rx.State == stCarrierLost)
|
||||
{
|
||||
NoCarrier:
|
||||
printf("\n\nNO CARRIER\n");
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
err = EXIT_SUCCESS;
|
||||
|
||||
Exit:
|
||||
|
||||
if (fAudio != NULL) fclose(fAudio);
|
||||
if (fData != NULL) fclose(fData);
|
||||
|
||||
return err;
|
||||
}
|
||||
/*
|
||||
int main(int argc, char* argv[])
|
||||
{
|
||||
uint sampleRate;
|
||||
double noiseLevel;
|
||||
|
||||
if (argc < 2 ||
|
||||
!strcasecmp(argv[1], "-help") ||
|
||||
!strcasecmp(argv[1], "/help") ||
|
||||
!strcasecmp(argv[1], "-?") ||
|
||||
!strcasecmp(argv[1], "/?"))
|
||||
{
|
||||
Usage:
|
||||
printf("Usage:\n\n"
|
||||
" %s tx <sample rate> <noise level> <data input file> <PCM output file>\n"
|
||||
" %s rx <sample rate> <PCM input file> <data output file>\n",
|
||||
argv[0],
|
||||
argv[0]);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!strcasecmp(argv[1], "tx") &&
|
||||
argc == 6 &&
|
||||
sscanf(argv[2], "%u", &sampleRate) == 1 &&
|
||||
sscanf(argv[3], "%lf", &noiseLevel) == 1)
|
||||
{
|
||||
return testTx(sampleRate, noiseLevel, argv[4], argv[5]);
|
||||
}
|
||||
else if (!strcasecmp(argv[1], "rx") &&
|
||||
argc == 5 &&
|
||||
sscanf(argv[2], "%u", &sampleRate) == 1)
|
||||
{
|
||||
return testRx(sampleRate, argv[3], argv[4]);
|
||||
}
|
||||
else
|
||||
{
|
||||
goto Usage;
|
||||
}
|
||||
}
|
||||
*/
|
||||
94
fsk_minitel.h
Normal file
94
fsk_minitel.h
Normal file
@ -0,0 +1,94 @@
|
||||
|
||||
typedef unsigned char uchar, uint8;
|
||||
typedef signed char schar, int8;
|
||||
typedef unsigned short ushort, uint16;
|
||||
typedef short int16;
|
||||
typedef unsigned int uint;
|
||||
typedef unsigned long ulong;
|
||||
#if UINT_MAX >= 0xFFFFFFFF
|
||||
typedef int int32;
|
||||
typedef unsigned int uint32;
|
||||
#else
|
||||
typedef long int32;
|
||||
typedef unsigned long uint32;
|
||||
#endif
|
||||
typedef long long int64;
|
||||
typedef unsigned long long uint64;
|
||||
|
||||
|
||||
typedef struct tTx
|
||||
{
|
||||
enum
|
||||
{
|
||||
stSendingOnes,
|
||||
stSendingData
|
||||
} State;
|
||||
|
||||
uint SampleRate;
|
||||
uint OnesFreq;
|
||||
uint ZeroesFreq;
|
||||
uint BitRate;
|
||||
|
||||
uint32 SampleCnt;
|
||||
uint BitSampleCnt;
|
||||
uint Data;
|
||||
uint DataLeft;
|
||||
|
||||
double Phase;
|
||||
double PhaseIncrement;
|
||||
|
||||
queue_state_t *queue;
|
||||
uint (*pTxGetDataCallBack)(struct tTx*, uint8*);
|
||||
} tTx;
|
||||
|
||||
typedef struct tRx
|
||||
{
|
||||
enum
|
||||
{
|
||||
stCarrierLost,
|
||||
stCarrierDetected,
|
||||
stReceivingData
|
||||
} State;
|
||||
|
||||
uint SampleRate;
|
||||
uint OnesFreq;
|
||||
uint ZeroesFreq;
|
||||
uint MidFreq;
|
||||
uint BitRate;
|
||||
|
||||
uint32 SampleCnt;
|
||||
uint BitSampleCnt;
|
||||
uint Data;
|
||||
|
||||
double Phase;
|
||||
double PhaseIncrement;
|
||||
|
||||
tComplex Filter[FILTER_LENGTH];
|
||||
double Delay[FILTER_LENGTH];
|
||||
|
||||
double LastAngle;
|
||||
int LastDelta;
|
||||
int32 Deltas;
|
||||
|
||||
int32 CarrierAngle;
|
||||
int32 CarrierCnt;
|
||||
|
||||
double LongAvgPower;
|
||||
double ShortAvgPower;
|
||||
queue_state_t *queue;
|
||||
void (*pRxGetDataCallBack)(struct tRx*, uint8);
|
||||
} tRx;
|
||||
|
||||
|
||||
void TxInit(tTx* pTx,
|
||||
uint SampleRate,
|
||||
uint (*pTxGetDataCallBack)(tTx*, uint8*));
|
||||
|
||||
int16 TxGetSample(tTx* pTx);
|
||||
|
||||
void RxInit(tRx* pRx,
|
||||
uint SampleRate,
|
||||
void (*pRxGetDataCallBack)(struct tRx*, uint8));
|
||||
|
||||
void RxGetSample(tRx* pRx, int16 Sample);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user