Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/redphone/JitterBuffer.cpp

@@ -0,0 +1,34 @@
+#include "JitterBuffer.h"
+
+#include <android/log.h>
+
+#define TAG "JitterBuffer"
+
+JitterBuffer::JitterBuffer() :
+  pendingAudio()
+{
+  pthread_mutex_init(&lock, NULL);
+}
+
+void JitterBuffer::addAudio(int64_t sequence, char* encodedData, int encodedDataLen) {
+  EncodedAudioData *encodedAudioData = new EncodedAudioData(encodedData, encodedDataLen, sequence);
+
+  pthread_mutex_lock(&lock);
+  pendingAudio.push(encodedAudioData);
+  __android_log_print(ANDROID_LOG_WARN, TAG, "Queue Size: %d", pendingAudio.size());
+  pthread_mutex_unlock(&lock);
+}
+
+EncodedAudioData* JitterBuffer::getAudio() {
+  EncodedAudioData *next = NULL;
+
+  pthread_mutex_lock(&lock);
+
+  if (!pendingAudio.empty()) {
+    next = pendingAudio.top();
+    pendingAudio.pop();
+  }
+
+  pthread_mutex_unlock(&lock);
+  return next;
+}