clean up ssb stuff a little

dsp/delay.c

@@ -0,0 +1,21 @@
+#include "delay.h"
+
+void init_delay_line(delay_line_t *delay_line, uint32_t sample_rate) {
+	delay_line->buffer = malloc(sample_rate * sizeof(float));
+	memset(delay_line->buffer, 0, sample_rate * sizeof(float));
+}
+
+void set_delay_line(delay_line_t *delay_line, uint32_t new_delay) {
+	delay_line->delay = new_delay;
+}
+
+float delay_line(delay_line_t *delay_line, float in) {
+	delay_line->buffer[delay_line->idx++] = in;
+	if (delay_line->idx >= delay_line->delay) delay_line->idx = 0;
+	return delay_line->buffer[delay_line->idx];
+}
+
+void exit_delay_line(delay_line_t *delay_line) {
+	if(delay_line->buffer != NULL) free(delay_line->buffer);
+	delay_line->buffer = NULL;
+}

dsp/delay.h

@@ -0,0 +1,12 @@
+#include <string.h>
+
+typedef struct delay_line_t {
+	float *buffer;
+	uint32_t delay;
+	uint32_t idx;
+} delay_line_t;
+
+void init_delay_line(delay_line_t *delay_line, uint32_t sample_rate);
+void set_delay_line(delay_line_t *delay_line, uint32_t new_delay);
+float delay_line(delay_line_t *delay_line, float in);
+void exit_delay_line(delay_line_t *delay_line);

modulation/stereo_encoder.c

@@ -1,26 +1,5 @@
 #include "stereo_encoder.h"
 
-#ifdef STEREO_SSB
-static void init_delay_line(struct delay_line_t *delay_line, uint32_t sample_rate) {
-	delay_line->buffer = malloc(sample_rate * sizeof(float));
-	memset(delay_line->buffer, 0, sample_rate * sizeof(float));
-}
-
-static void set_delay_line(struct delay_line_t *delay_line, uint32_t new_delay) {
-	delay_line->delay = new_delay;
-}
-
-static inline float delay_line(struct delay_line_t *delay_line, float in) {
-	delay_line->buffer[delay_line->idx++] = in;
-	if (delay_line->idx >= delay_line->delay) delay_line->idx = 0;
-	return delay_line->buffer[delay_line->idx];
-}
-
-static void exit_delay_line(struct delay_line_t *delay_line) {
-	free(delay_line->buffer);
-}
-#endif
-
 // Multiplier is the multiplier to get to 19 khz
 void init_stereo_encoder(StereoEncoder* st, uint8_t multiplier, Oscillator* osc, float audio_volume, float pilot_volume) {
     st->multiplier = multiplier;
@@ -28,18 +7,17 @@ void init_stereo_encoder(StereoEncoder* st, uint8_t multiplier, Oscillator* osc,
     st->pilot_volume = pilot_volume;
     st->audio_volume = audio_volume;
     #ifdef STEREO_SSB
-    init_delay_line(&st->delay, STEREO_SSB*2+1);
+    init_delay_line(&st->delay, osc->sample_rate);
+    set_delay_line(&st->delay, STEREO_SSB*2+1);
     #endif
 }
 
-#ifdef STEREO_SSB
 float stereo_encode(StereoEncoder* st, uint8_t enabled, float left, float right, firhilbf *hilbert) {
-#else
-float stereo_encode(StereoEncoder* st, uint8_t enabled, float left, float right) {
-#endif
     float mid = (left+right) * 0.5f;
     if(!enabled) return mid * st->audio_volume;
+    #ifdef STEREO_SSB
     mid = delay_line(&st->delay, mid);
+    #endif
 
     float half_audio = st->audio_volume * 0.5f;
 
@@ -61,3 +39,7 @@ float stereo_encode(StereoEncoder* st, uint8_t enabled, float left, float right)
     return (mid*half_audio) + (signalx1*st->pilot_volume) + ((side*signalx2) * half_audio);
 #endif
 }
+
+void exit_stereo_encoder(StereoEncoder* st) {
+    exit_delay_line(&st->delay);
+}

modulation/stereo_encoder.h

@@ -4,17 +4,9 @@
 
 #include <stdint.h>
 #include "../dsp/oscillator.h"
-#ifdef STEREO_SSB
 #include <liquid/liquid.h>
 #include <complex.h>
-#include <string.h>
+#include "../dsp/delay.h"
-
-typedef struct delay_line_t {
-	float *buffer;
-	uint32_t delay;
-	uint32_t idx;
-} delay_line_t;
-#endif
 
 typedef struct
 {
@@ -22,15 +14,9 @@ typedef struct
     Oscillator* osc;
     float audio_volume;
     float pilot_volume;
-#ifdef STEREO_SSB
     struct delay_line_t delay;
-#endif
 } StereoEncoder;
 
 void init_stereo_encoder(StereoEncoder *st, uint8_t multiplier, Oscillator *osc, float audio_volume, float pilot_volume);
-
-#ifdef STEREO_SSB
 float stereo_encode(StereoEncoder* st, uint8_t enabled, float left, float right, firhilbf *hilbert);
-#else
+void exit_stereo_encoder(StereoEncoder* st);
-float stereo_encode(StereoEncoder* st, uint8_t enabled, float left, float right);
-#endif

src/fm95.c

@@ -145,7 +145,7 @@ void cleanup_runtime(FM95_Runtime* runtime, const FM95_Config config) {
 	}
 	#ifdef STEREO_SSB
 	firhilbf_destroy(runtime->stereo_hilbert);
-	free(runtime->stencode.delay.buffer);
+	exit_stereo_encoder(runtime->stencode);
 	#endif
 }