1 files changed, 38 insertions, 0 deletions
diff --git a/openbsc/include/openbsc/rtp.h b/openbsc/include/openbsc/rtp.h
new file mode 100644
index 000000000..451d0defa
--- /dev/null
+++ b/openbsc/include/openbsc/rtp.h
@@ -0,0 +1,38 @@
+#pragma once
+
+/* attempt to determine byte order */
+#include <sys/param.h>
+#include <limits.h>
+#include <time.h>
+
+#ifndef __BYTE_ORDER
+# ifdef __APPLE__
+#  define __BYTE_ORDER __DARWIN_BYTE_ORDER
+#  define __LITTLE_ENDIAN __DARWIN_LITTLE_ENDIAN
+#  define __BIG_ENDIAN __DARWIN_BIG_ENDIAN
+# else
+#  error "__BYTE_ORDER should be defined by someone"
+# endif
+#endif
+
+/* according to rtp_proxy.c RFC 3550 */
+struct rtp_hdr {
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	uint8_t  csrc_count:4,
+		  extension:1,
+		  padding:1,
+		  version:2;
+	uint8_t  payload_type:7,
+		  marker:1;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+	uint8_t  version:2,
+		  padding:1,
+		  extension:1,
+		  csrc_count:4;
+	uint8_t  marker:1,
+		  payload_type:7;
+#endif
+	uint16_t sequence;
+	uint32_t timestamp;
+	uint32_t ssrc;
+} __attribute__((packed));