Added SDL waterfall prototype api

1 files changed, 251 insertions, 0 deletions

diff --git a/test/ui_gl_waterfall.c b/test/ui_gl_waterfall.c
index 40872c8..1af4096 100644
--- a/test/ui_gl_waterfall.c
+++ b/test/ui_gl_waterfall.c
@@ -1,7 +1,258 @@
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
+
+//radiola
+#include <draw/tui.h>
+#include <hw/hw.h>
+
+#define SAMPLE_RATE  2048000
+
+#define CENTER_FREQ  446500000
+#define FFT_LEVEL    10
+#define FFT_SIZE     (1 << FFT_LEVEL)
+#define BUF_LENGHT   (2 * FFT_SIZE)
+#define PRESCALE     8
+#define POSTSCALE    2
+
+static rtlsdr_dev_t *dev = NULL;
+
+int16_t* Sinewave;
+int N_WAVE, LOG2_N_WAVE;
+double* power_table;
+
+int sdr_init()
+{
+	int ret;
+	uint32_t dev_index = 0;
+
+	//open tunner
+	ret = rtlsdr_open(&dev, (uint32_t)dev_index);
+	if ( ret < 0 )
+	{
+		printf("Cannot open device %02d\n", dev_index );
+		return -1;
+	}
+
+	ret = rtlsdr_reset_buffer(dev);
+	if ( ret < 0 )
+	{
+		printf("Couldnt reset buffer\n");
+		return -1;
+	}
+
+	ret = rtlsdr_set_sample_rate(dev, SAMPLE_RATE);
+	if ( ret < 0 )
+	{
+		printf("Coulnt set sample rate to %d\n", SAMPLE_RATE);
+		return -1;
+	}
+
+	ret = rtlsdr_set_center_freq( dev, CENTER_FREQ );
+	if ( ret < 0 )
+	{
+		printf("Couldnt set freq %d\n", CENTER_FREQ);
+		return -1;
+	}
+
+	ret = rtlsdr_set_tuner_gain_mode( dev, 1 );
+	if ( ret < 0 )
+	{
+		printf("Cannot set auto gain mode\n");
+		return -1;
+	}
+
+	ret = rtlsdr_set_agc_mode( dev, 1);
+	if ( ret < 0 )
+	{
+		printf("Cannot set agc mode\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+
+int sdr_close()
+{
+	//close tunner
+	if ( dev != NULL)
+	{
+		rtlsdr_close( dev );
+		dev = NULL;
+		return 0;
+	}
+	return -1;
+}
+
+int sdr_get_samples( uint8_t *buf, int len )
+{
+	int ret, read_num;
+
+	ret = rtlsdr_read_sync( dev, buf, len, &read_num );
+	if (ret < 0)
+	{
+		printf("sync read failed\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+//better to have size  size mod olen == 0
+int normalise( uint8_t *ibuf, int ilen, uint8_t *obuf, int olen )
+{
+	int i,j,m;
+	int ppi;
+
+	if ( ilen >= olen )
+	{
+		ppi = ilen / olen;
+	} else {
+		return -1;
+	}
+	m = 0;
+	i = 0;
+	while ( (i < ilen) && (m < olen) )
+	{
+		uint32_t sum=0;
+		for ( j=0; j<ppi; j++ );
+			sum += ibuf[i+j];
+		sum /= ppi;
+		obuf[m] = sum;
+		//printf("%d-", obuf[m] );
+
+		i += ppi;
+		m += 1;
+	}
+
+	return 0;
+}
+
+void sine_table(int size)
+{
+    int i;
+    double d;
+    LOG2_N_WAVE = size;
+    N_WAVE = 1 << LOG2_N_WAVE;
+    Sinewave = malloc(sizeof(int16_t) * N_WAVE*3/4);
+    power_table = malloc(sizeof(double) * N_WAVE);
+    for (i=0; i<N_WAVE*3/4; i++)
+    {
+        d = (double)i * 2.0 * M_PI / N_WAVE;
+        Sinewave[i] = (int)round(32767*sin(d));
+    }
+}
+
+int16_t FIX_MPY(int16_t a, int16_t b)
+/* fixed point multiply and scale */
+{
+	int c = ((int)a * (int)b) >> 14;
+	b = c & 0x01;
+	return (c >> 1) + b;
+}
+
+int32_t real_conj(int16_t real, int16_t imag)
+/* real(n * conj(n)) */
+{
+    return ((int32_t)real*(int32_t)real + (int32_t)imag*(int32_t)imag);
+}
+
+int fix_fft(int16_t iq[], int m)
+/* interleaved iq[], 0 <= n < 2**m, changes in place */
+{
+	int mr, nn, i, j, l, k, istep, n, shift;
+	int16_t qr, qi, tr, ti, wr, wi;
+	n = 1 << m;
+	if (n > N_WAVE)
+		{return -1;}
+	mr = 0;
+	nn = n - 1;
+	/* decimation in time - re-order data */
+	for (m=1; m<=nn; ++m) {
+		l = n;
+		do
+			{l >>= 1;}
+		while (mr+l > nn);
+		mr = (mr & (l-1)) + l;
+		if (mr <= m)
+			{continue;}
+		// real = 2*m, imag = 2*m+1
+		tr = iq[2*m];
+		iq[2*m] = iq[2*mr];
+		iq[2*mr] = tr;
+		ti = iq[2*m+1];
+		iq[2*m+1] = iq[2*mr+1];
+		iq[2*mr+1] = ti;
+	}
+	l = 1;
+	k = LOG2_N_WAVE-1;
+	while (l < n) {
+		shift = 1;
+		istep = l << 1;
+		for (m=0; m<l; ++m) {
+			j = m << k;
+			wr =  Sinewave[j+N_WAVE/4];
+			wi = -Sinewave[j];
+			if (shift) {
+				wr >>= 1; wi >>= 1;}
+			for (i=m; i<n; i+=istep) {
+				j = i + l;
+				tr = FIX_MPY(wr,iq[2*j]) - FIX_MPY(wi,iq[2*j+1]);
+				ti = FIX_MPY(wr,iq[2*j+1]) + FIX_MPY(wi,iq[2*j]);
+				qr = iq[2*i];
+				qi = iq[2*i+1];
+				if (shift) {
+					qr >>= 1; qi >>= 1;}
+				iq[2*j] = qr - tr;
+				iq[2*j+1] = qi - ti;
+				iq[2*i] = qr + tr;
+				iq[2*i+1] = qi + ti;
+			}
+		}
+		--k;
+		l = istep;
+	}
+	return 0;
+}
+
+//fftize
+int simple_fft( uint8_t *buf, int len )
+{
+	int i,j;
+	uint16_t p;
+	int fft_len;
+
+	for (i=0; i<len; i++)
+	{
+		buf[i] = buf[i] * PRESCALE;
+	}
+
+	fix_fft( (uint16_t *)buf, FFT_LEVEL );
+
+	for (i=0; i<FFT_SIZE; i++)
+	{
+		//buf1[i] = rtl_out.buf[i];
+		//p = buf1[i] * buf1[i];
+		j = i*2;
+		p = (int16_t)real_conj(buf[j], buf[j + 1]);
+		buf[i] += p;
+	}
+
+	fft_len = FFT_SIZE / 2;
+	for (i=0; i<fft_len; i++)
+	{
+		buf[i] =         (int)log10(POSTSCALE * (float)buf[i+fft_len]);
+		buf[i+fft_len] = (int)log10(POSTSCALE * (float)buf[i]);
+	}
+
+	return 0;
+}
 
 int main()
 {
+
+
+
 	return 0;
 }
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