Support for Signal calls.

Merge in RedPhone

// FREEBIE

jni/redphone/RtpPacket.cpp

@@ -0,0 +1,78 @@
+#include "RtpPacket.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <arpa/inet.h>
+
+#include "SrtpStream.h"
+//#include <srtp.h>
+
+RtpPacket::RtpPacket(char* packetBuf, int packetLen) {
+  packet     = (char*)malloc(packetLen);
+  payloadLen = packetLen - sizeof(RtpHeader);
+  memcpy(packet, packetBuf, packetLen);
+}
+
+RtpPacket::RtpPacket(char* payload, int payloadBufLen, int sequenceNumber, int timestamp) {
+  packet     = (char*)malloc(sizeof(RtpHeader) + payloadBufLen + SRTP_MAC_SIZE);
+  payloadLen = payloadBufLen;
+
+  memset(packet, 0, sizeof(RtpHeader) + payloadLen + SRTP_MAC_SIZE);
+
+  RtpHeader *header = (RtpHeader*)packet;
+  header->flags          = htons(32768);
+  header->sequenceNumber = htons(sequenceNumber);
+  header->ssrc           = 0;
+  header->timestamp      = htonl(timestamp);
+
+  memcpy(packet + sizeof(RtpHeader), payload, payloadLen);
+}
+
+RtpPacket::~RtpPacket() {
+  free(packet);
+}
+
+uint16_t RtpPacket::getSequenceNumber() {
+  RtpHeader *header = (RtpHeader*)packet;
+  return ntohs(header->sequenceNumber);
+}
+
+int RtpPacket::getPayloadType() {
+  RtpHeader *header = (RtpHeader*)packet;
+  return header->flags & 0x7F;
+}
+
+uint32_t RtpPacket::getTimestamp() {
+  RtpHeader *header = (RtpHeader*)packet;
+  return ntohl(header->timestamp);
+}
+
+void RtpPacket::setTimestamp(uint32_t timestamp) {
+  RtpHeader *header = (RtpHeader*)packet;
+  header->timestamp = htonl(timestamp);
+}
+
+uint32_t RtpPacket::getSsrc() {
+  RtpHeader *header = (RtpHeader*)packet;
+  return ntohl(header->ssrc);
+}
+
+char* RtpPacket::getPayload() {
+  return packet + sizeof(RtpHeader);
+}
+
+uint32_t RtpPacket::getPayloadLen() {
+  return payloadLen;
+}
+
+void RtpPacket::setPayloadLen(uint32_t payloadLen) {
+  this->payloadLen = payloadLen;
+}
+
+char* RtpPacket::getSerializedPacket() {
+  return packet;
+}
+
+int RtpPacket::getSerializedPacketLen() {
+  return sizeof(RtpHeader) + payloadLen;
+}