--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/intercom/rtp.h	Fri Jun 25 09:57:52 2010 +0200
@@ -0,0 +1,81 @@
+/* rtp.h
+ *
+ * Copyright (C) DFS Deutsche Flugsicherung (2004, 2005). 
+ * All Rights Reserved.
+ * Author: Andre Adrian
+ *
+ * subset of Real Time Protocol Version 2 (RFC3550 and RFC3551)
+ * handling of extension and padding is missing
+ *
+ * Version 0.3.5
+ */
+
+class RTP {
+  /* Format in Host Byte order. Conversion with htonl() to Network Byte
+   * order. This data structure is implementation dependent! 
+   * Tested with GCC and x86 */
+
+  /* first 32bits */
+  unsigned long sequence:16;
+  unsigned long payload_type:7;
+  unsigned long marker:1;
+  unsigned long csrc_count:4;
+  unsigned long extension:1;
+  unsigned long padding:1;
+  unsigned long version:2;
+
+  /* second 32bits */
+  unsigned long timestamp;
+
+  /* third 32bits */
+  unsigned long ssrc;  /* used as unique identifier */
+  
+  /* optional - used with telephone conference */
+  unsigned long csrc[15];
+
+public:
+   RTP::RTP();
+  void RTP::init(int payload_type_, unsigned long ssrc_);
+  int RTP::add_csrc(unsigned long csrc_);
+  void RTP::reset_csrc();
+  int RTP::find_csrc(unsigned long ssrc_);
+  void RTP::next(int frameduration);
+  int RTP::check();
+  unsigned long RTP::getssrc() {
+    return ssrc;
+  };
+  int RTP::get_pt() {
+    return (int) payload_type;
+  };
+  int RTP::get_cc() {
+    return (int) csrc_count;
+  }
+};
+
+const unsigned PT_PCMU = 0;     // 8000 sample/second, G.711 u-Law
+const unsigned PT_GSM =  3;     // 8000 sample/second, GSM
+const unsigned PT_PCMA = 8;     // 8000 sample/second, G.711 A-Law
+const unsigned PT_G729 = 18;    // 8000 sample/second, G.729
+const unsigned PT_EFR =  97;    // inofficial type GSM-EFR
+const unsigned PT_iLBC = 98;    // inofficial type iLBC 20ms
+const unsigned PT_G726 = 99;    // inofficial type G.726 32kbps
+const unsigned PT_SPX =  101;   // inofficial type Wideband Speex
+
+// Speex Wideband kbps/Bytes: 16.8/42, 20.6/52, 23.8/60, 27.8/70, 
+// 34.2/86, 42.2/106
+const int SPX_BITRATE = 27800;
+const int SPX_COMPLEXITY = 3;
+const int SPX_QUALITY = 8;
+const int SPX_ENH = 1;
+
+#define SZ_PCMA 160
+#define SZ_PCMU 160
+#define SZ_G726 80
+#define SZ_GSM  33
+#define SZ_EFR  31
+#define SZ_SPX  70
+#define SZ_iLBC 38
+
+char *RTP_network_copy(char *to, RTP * from);
+char *RTP_host_copy(RTP * to, char *from);
+unsigned long random32(int type);