Generate compador table only once when the application starts

src/amps/dsp.c

@@ -162,6 +162,8 @@ void dsp_init(void)
 	}
 	dsp_sync_check[0x712] = 0x00; /* no bit error */
 	dsp_sync_check[0x0ed] = 0x80; /* no bit error */
+
+	compandor_init();
 }
 
 static void dsp_init_ramp(amps_t *amps)
@@ -194,7 +196,7 @@ int dsp_init_sender(amps_t *amps, int tolerant)
 	int half;
 
 	/* attack (3ms) and recovery time (13.5ms) according to amps specs */
-	init_compandor(&amps->cstate, 8000, 3.0, 13.5);
+	setup_compandor(&amps->cstate, 8000, 3.0, 13.5);
 
 	PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Init DSP for transceiver.\n");
 

src/cnetz/dsp.c

@@ -76,6 +76,7 @@ const char *cnetz_dsp_mode_name(enum dsp_mode mode)
 
 void dsp_init(void)
 {
+	compandor_init();
 }
 
 static void dsp_init_ramp(cnetz_t *cnetz)
@@ -160,7 +161,7 @@ int dsp_init_sender(cnetz_t *cnetz, int measure_speed, double clock_speed[2], en
 
 	/* init compandor, according to C-Netz specs, attack and recovery time
 	 * shall not exceed according to ITU G.162 */
-	init_compandor(&cnetz->cstate, 8000, 5.0, 22.5);
+	setup_compandor(&cnetz->cstate, 8000, 5.0, 22.5);
 
 	/* use duration of one bit to ramp level of last frame to current frame */
 	cnetz->offset_range = ceil(cnetz->fsk_bitduration);

src/libcompandor/compandor.c

@@ -19,6 +19,7 @@
 
 #include <stdio.h>
 #include <stdint.h>
+#include <stdlib.h>
 #include <string.h>
 #include <math.h>
 #include "../libsample/sample.h"
@@ -39,6 +40,7 @@
 #define ENVELOPE_MAX	9.990
 
 static double sqrt_tab[10000];
+static int compandor_initalized = 0;
 
 /*
  * Init compandor according to ITU-T G.162 specification
@@ -46,10 +48,24 @@ static double sqrt_tab[10000];
  * Hopefully this is correct
  *
  */
-void init_compandor(compandor_t *state, double samplerate, double attack_ms, double recovery_ms)
+
+void compandor_init(void)
 {
 	int i;
 
+	// FIXME: make global, not at instance
+	for (i = 0; i < 10000; i++)
+		sqrt_tab[i] = sqrt(i * 0.001);
+	compandor_initalized = 1;
+}
+
+void setup_compandor(compandor_t *state, double samplerate, double attack_ms, double recovery_ms)
+{
+	if (!compandor_initalized) {
+		fprintf(stderr, "Compandor nicht initialized.\n");
+		abort();
+	}
+
 	memset(state, 0, sizeof(*state));
 
 	state->c.peak = 1.0;
@@ -60,10 +76,6 @@ void init_compandor(compandor_t *state, double samplerate, double attack_ms, dou
 	state->c.step_down = pow(COMPRESS_RECOVERY_FACTOR, 1000.0 / recovery_ms / samplerate);
 	state->e.step_up = pow(EXPAND_ATTACK_FACTOR, 1000.0 / attack_ms / samplerate);
 	state->e.step_down = pow(EXPAND_RECOVERY_FACTOR, 1000.0 / recovery_ms / samplerate);
-
-	// FIXME: make global, not at instance
-	for (i = 0; i < 10000; i++)
-		sqrt_tab[i] = sqrt(i * 0.001);
 }
 
 void compress_audio(compandor_t *state, sample_t *samples, int num)

src/libcompandor/compandor.h

@@ -14,7 +14,8 @@ typedef struct compandor {
 	} e;
 } compandor_t;
 
-void init_compandor(compandor_t *state, double samplerate, double attack_ms, double recovery_ms);
+void compandor_init(void);
+void setup_compandor(compandor_t *state, double samplerate, double attack_ms, double recovery_ms);
 void compress_audio(compandor_t *state, sample_t *samples, int num);
 void expand_audio(compandor_t *state, sample_t *samples, int num);
 

src/libdisplay/display_measurements.c

@@ -24,6 +24,7 @@
 #include <pthread.h>
 #include <sys/ioctl.h>
 #include <math.h>
+#include <sys/param.h>
 #include "../libsample/sample.h"
 #include "../libdebug/debug.h"
 #include "../libdisplay/display.h"
@@ -246,7 +247,7 @@ static void print_measurements(int on)
 				memset(line_color + width - MAX_UNIT_LEN, 4, MAX_UNIT_LEN); /* blue */
 			else
 				memset(line_color + width - MAX_UNIT_LEN, 3, MAX_UNIT_LEN); /* yellow */
-			strncpy(line + width - MAX_UNIT_LEN + 1, text, (strlen(text) < MAX_UNIT_LEN) ? strlen(text) : MAX_UNIT_LEN);
+			memcpy(line + width - MAX_UNIT_LEN + 1, text, MAX(strlen(text), MAX_UNIT_LEN));
 			display_line(on, width);
 		}
 	}

src/nmt/dsp.c

@@ -97,6 +97,8 @@ void dsp_init(void)
 		/* dialtone sine */
 		dsp_sine_dialtone[i] = s * TX_PEAK_DIALTONE;
 	}
+
+	compandor_init();
 }
 
 static int fsk_send_bit(void *inst);
@@ -109,7 +111,7 @@ int dsp_init_sender(nmt_t *nmt, double deviation_factor)
 	int i;
 
 	/* attack (3ms) and recovery time (13.5ms) according to NMT specs */
-	init_compandor(&nmt->cstate, 8000, 3.0, 13.5);
+	setup_compandor(&nmt->cstate, 8000, 3.0, 13.5);
 
 	PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Init DSP for Transceiver.\n");
 

src/r2000/dsp.c

@@ -64,6 +64,7 @@
 /* global init for FSK */
 void dsp_init(void)
 {
+	compandor_init();
 }
 
 static int fsk_send_bit(void *inst);
@@ -75,7 +76,7 @@ static void super_receive_bit(void *inst, int bit, double quality, double level)
 int dsp_init_sender(r2000_t *r2000)
 {
 	/* attack (3ms) and recovery time (13.5ms) according to NMT specs */
-	init_compandor(&r2000->cstate, 8000, 3.0, 13.5);
+	setup_compandor(&r2000->cstate, 8000, 3.0, 13.5);
 
 	PDEBUG_CHAN(DDSP, DEBUG_DEBUG, "Init DSP for Transceiver.\n");
 

src/test/test_compandor.c

@@ -72,7 +72,8 @@ int main(void)
 	sample_t samples[SAMPLERATE * 2];
 	int f;
 
-	init_compandor(&cstate, SAMPLERATE, ATTACK_MS, RECOVERY_MS);
+	compandor_init();
+	setup_compandor(&cstate, SAMPLERATE, ATTACK_MS, RECOVERY_MS);
 
 	for (f = 0; f < 3; f++) {
 		/* -16 and -4 dB */