sound: Fix frequency handling and add RPM rev test (#29)

- Change curr_frequency from uint32_t to double for precise frequency
  control
- Remove get_closest_frequency() and change phase calculation in engine
  sound to ensure continuous sine curve
- Add RPM revving test

src/monocoque/devices/sound/usb_generic_shaker.c

@@ -80,7 +80,7 @@ int patestCallbackGearShift(const void*                     inputBuffer,
         data->curr_duration += 1.0 / SAMPLE_RATE;
         if (data->curr_duration >= data->duration) {
             data->curr_duration = 0.0;
-            data->curr_frequency = 0;
+            data->curr_frequency = 0.0;
         }
 
         *out++ = sample;

src/monocoque/devices/sound/usb_generic_shaker_pulse.c

@@ -37,46 +37,38 @@ void gear_sound_stream(pa_stream *s, size_t length, void *userdata) {
         data->curr_duration += 1.0 / SAMPLE_RATE;
         if (data->curr_duration >= data->duration) {
             data->curr_duration = 0.0;
-            data->curr_frequency = 0;
+            data->curr_frequency = 0.0;
         }
     }
     pa_stream_write(s, buffer, length, NULL, 0LL, PA_SEEK_RELATIVE);
 }
 
-double get_closest_frequency(size_t num_samples, double input_frequency) {
-
-    double samples_per_cycle = SAMPLE_RATE / input_frequency;
-
-    double adjusted_frequency = SAMPLE_RATE / (num_samples / floor(num_samples/samples_per_cycle) );
-
-    return adjusted_frequency;
-}
-
 void engine_sound_stream(pa_stream *s, size_t length, void *userdata) {
 
     SoundData* data = (SoundData*)userdata;
     double freq = data->curr_frequency;
 
     size_t num_samples = length / sizeof(int16_t);
-    freq = get_closest_frequency( num_samples, freq );
+
     //size_t num_samples = (size_t) (DURATION * SAMPLE_RATE);
     int16_t buffer[num_samples];
 
     //double t = 0;
     for (size_t i = 0; i < num_samples; i++) {
+
         double t = data->phase;
 
-        double sample = ((double)data->curr_amplitude/100) * 32767.0 * sin( 2.0 * M_PI * freq * t );
+        double sample = ((double)data->curr_amplitude/100) * 32767.0 * sin( 2.0 * M_PI * t );
 
         buffer[i] = (int16_t)sample;
 
-        t += 1.0 / SAMPLE_RATE;
-        if (t >= SAMPLE_RATE) {
-            t = 0;
+        t += freq / SAMPLE_RATE;
+        if (t >= 1.0) {
+            t -= floor(t);
         }
+
         data->phase = t;
     }
-    data->phase = round(data->phase);
 
     pa_stream_write(s, buffer, length, NULL, 0LL, PA_SEEK_RELATIVE);
 }

src/monocoque/devices/sounddevice.c

@@ -26,7 +26,7 @@ int gear_sound_set(SoundDevice* sounddevice, SimData* simdata)
     }
     sounddevice->sounddata.last_gear = simdata->gear;
 
-    slogt("set gear frequency to %i", sounddevice->sounddata.curr_frequency);
+    slogt("set gear frequency to %f", sounddevice->sounddata.curr_frequency);
 }
 
 
@@ -37,9 +37,9 @@ double modulate(SoundDevice* sounddevice, double raw_effect, SoundEffectModulati
     {
         case SOUND_EFFECT_MODULATION_FREQUENCY:
             modulated_effect = ((sounddevice->sounddata.frequencyMax - sounddevice->sounddata.frequency) * raw_effect) + sounddevice->sounddata.frequency;
-            sounddevice->sounddata.curr_frequency = trunc(modulated_effect);
+            sounddevice->sounddata.curr_frequency = modulated_effect;
             sounddevice->sounddata.curr_amplitude = sounddevice->sounddata.amplitude;
-            slogt("set curr frequency to %i from raw effect %f and base frequency %i", sounddevice->sounddata.curr_frequency, raw_effect, sounddevice->sounddata.frequency);
+            slogt("set curr frequency to %f from raw effect %f and base frequency %i", sounddevice->sounddata.curr_frequency, raw_effect, sounddevice->sounddata.frequency);
             break;
         case SOUND_EFFECT_MODULATION_AMPLIFY:
             modulated_effect = ((sounddevice->sounddata.amplitudeMax - sounddevice->sounddata.amplitude) * raw_effect) + sounddevice->sounddata.amplitude;
@@ -80,7 +80,7 @@ int sounddev_tyreslip_update(SimDevice* this, SimData* simdata)
     }
     else
     {
-        sounddevice->sounddata.curr_frequency = 0;
+        sounddevice->sounddata.curr_frequency = 0.0;
         sounddevice->sounddata.curr_amplitude = 0;
         sounddevice->sounddata.curr_duration = 0;
     }
@@ -100,7 +100,7 @@ int sounddev_tyrelock_update(SimDevice* this, SimData* simdata)
     }
     else
     {
-        sounddevice->sounddata.curr_frequency = 0;
+        sounddevice->sounddata.curr_frequency = 0.0;
         sounddevice->sounddata.curr_amplitude = 0;
         sounddevice->sounddata.curr_duration = 0;
     }
@@ -118,7 +118,7 @@ int sounddev_absbrakes_update(SimDevice* this, SimData* simdata)
     }
     else
     {
-        sounddevice->sounddata.curr_frequency = 0;
+        sounddevice->sounddata.curr_frequency = 0.0;
         sounddevice->sounddata.curr_amplitude = 0;
         sounddevice->sounddata.curr_duration = 0;
     }
@@ -138,7 +138,7 @@ int sounddev_suspension_update(SimDevice* this, SimData* simdata)
     }
     else
     {
-        sounddevice->sounddata.curr_frequency = 0;
+        sounddevice->sounddata.curr_frequency = 0.0;
         sounddevice->sounddata.curr_amplitude = 0;
         sounddevice->sounddata.curr_duration = 0;
     }
@@ -189,7 +189,7 @@ int sounddev_init(SoundDevice* sounddevice, const char* devname, MonocoqueTyreId
     sounddevice->sounddata.phase = 0;
 
     sounddevice->sounddata.curr_amplitude = 0;
-    sounddevice->sounddata.curr_frequency = 0;
+    sounddevice->sounddata.curr_frequency = 0.0;
 
 
     const char* streamname= "Engine";

src/monocoque/devices/sounddevice.h

@@ -26,7 +26,7 @@ typedef struct
     uint32_t amplitude;
     uint32_t amplitudeMax;
     double duration;
-    uint32_t curr_frequency;
+    double curr_frequency;
     uint32_t curr_amplitude;
     double curr_duration;
     double phase;

src/monocoque/gameloop/gameloop.c

@@ -726,7 +726,35 @@ int tester(SimDevice* devices, int numdevices)
     simdata->Yvelocity = 100;
     simdata->Zvelocity = 0;
 
-    sleep(3);
+    sleep(1);
+
+    fprintf(stdout, "Revving rpm from 1000 to 8000 and back\n");
+
+    for (int r = 0; r < 8000; r += 3)
+    {
+        simdata->rpms = 1000 + r;
+        for (int x = 0; x < numdevices; x++)
+        {
+            if (devices[x].initialized == true)
+            {
+                devices[x].update(&devices[x], simdata);
+            }
+        }
+        usleep(1000);
+    }
+
+    for (int r = 0; r < 8000; r += 3)
+    {
+        simdata->rpms = 9000 - r;
+        for (int x = 0; x < numdevices; x++)
+        {
+            if (devices[x].initialized == true)
+            {
+                devices[x].update(&devices[x], simdata);
+            }
+        }
+        usleep(1000);
+    }
 
     fprintf(stdout, "Setting rpms to 1000\n");
     simdata->rpms = 1000;