Added Procedural audio noise when moving, scaled to velocity

interface/src/Audio.cpp

@@ -111,11 +111,8 @@ int audioCallback (const void *inputBuffer,
     
     int16_t *inputLeft = ((int16_t **) inputBuffer)[0];
     
-    //  Add some noise to the audio we got from the callback
-    
-    for (int i = 0; i < BUFFER_LENGTH_SAMPLES; i++) {
-        inputLeft[i] = (int16_t) (rand() % 65536);
-    }
+    // Add Procedural effects to input samples
+    data->addProceduralSounds(inputLeft, BUFFER_LENGTH_SAMPLES);
     
     if (inputLeft != NULL) {
         

interface/src/Audio.h

@@ -30,6 +30,9 @@ public:
     
     void setWalkingState(bool newWalkState);
     
+    void setLastAcceleration(glm::vec3 a) { audioData->setLastAcceleration(a); };
+    void setLastVelocity(glm::vec3 v) { audioData->setLastVelocity(v); };
+    
     // terminates audio I/O
     bool terminate();
 private:    

interface/src/AudioData.cpp

@@ -28,4 +28,20 @@ AudioData::~AudioData() {
     delete audioSocket;
 }
 
+//  Take a pointer to the acquired microphone input samples and add procedural sounds
+void AudioData::addProceduralSounds(int16_t* inputBuffer, int numSamples) {
+    const float MAX_AUDIBLE_VELOCITY = 3.0;
+    const float MIN_AUDIBLE_VELOCITY = 0.1;
+    const float VOLUME = 200;
+    float speed = glm::length(_lastVelocity);
+    if ((speed > MIN_AUDIBLE_VELOCITY) && (speed < MAX_AUDIBLE_VELOCITY)) {
+        for (int i = 0; i < numSamples; i++) {
+            inputBuffer[i] += (int16_t) ((randFloat() - 0.5f) * VOLUME * speed) ;
+        }
+    }
+
+    return;
+}
+
+
 #endif

interface/src/AudioData.h

@@ -39,6 +39,17 @@ class AudioData {
     
         bool mixerLoopbackFlag;
         bool playWalkSound;
+    
+        //  Added avatar acceleration and velocity for procedural effects sounds from client
+        void setLastVelocity(glm::vec3 v) { _lastVelocity = v; };
+        void setLastAcceleration(glm::vec3 a) { _lastAcceleration = a; };
+        void addProceduralSounds(int16_t* inputBuffer, int numSamples);
+    
+    private: 
+        glm::vec3 _lastVelocity;
+        glm::vec3 _lastAcceleration;
+
+    
 };
 
 #endif /* defined(__interface__AudioData__) */

interface/src/Avatar.h

@@ -105,6 +105,7 @@ public:
     const glm::vec3& getJointPosition(AvatarJointID j) const { return _joint[j].position; };
     const glm::vec3& getBodyUpDirection() const { return _orientation.getUp(); };
     float getSpeed() const { return _speed; };
+    const glm::vec3& getVelocity() const { return _velocity; };
     float getGirth();
     float getHeight();
     

interface/src/main.cpp

@@ -1671,6 +1671,7 @@ void idle(void) {
             handControl.stop();
 		}
         
+        //  Read serial port interface devices
         if (serialPort.active && USING_INVENSENSE_MPU9150) {
             serialPort.readData();
         }
@@ -1696,7 +1697,11 @@ void idle(void) {
     
         myAvatar.setGravity(getGravity(myAvatar.getPosition()));
         myAvatar.simulate(deltaTime);
-
+        
+        //  Update audio stats for procedural sounds
+        audio.setLastAcceleration(myAvatar.getThrust());
+        audio.setLastVelocity(myAvatar.getVelocity());
+        
         glutPostRedisplay();
         lastTimeIdle = check;
     }