1 files changed, 150 insertions, 0 deletions
diff --git a/src/sdp.h b/src/sdp.h
new file mode 100644
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--- /dev/null
+++ b/src/sdp.h
@@ -0,0 +1,150 @@
+/**
+ * liburtc
+ * Copyright 2020 Chris Hiszpanski
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _URTC_SDP_H
+#define _URTC_SDP_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdbool.h>
+#include <stdint.h>
+
+
+// Maximum size of SDP string (in bytes)
+#define SDP_MAX_SIZE					2048
+
+#define SDP_MAX_USERNAME_SIZE			32
+#define SDP_MAX_SESSION_ID_SIZE			32
+#define SDP_MAX_SESSION_VERSION_SIZE	32
+#define SDP_MAX_SESSION_NAME_SIZE		32
+
+#define SDP_MAX_BUNDLE_IDS				5
+#define SDP_MAX_BUNDLE_ID_SIZE			32
+#define SDP_MAX_RTP_PAYLOAD_TYPES		32
+
+
+typedef enum sdp_mode {
+	SDP_MODE_SEND_AND_RECEIVE = 0,
+	SDP_MODE_RECEIVE_ONLY,
+	SDP_MODE_SEND_ONLY
+} sdp_mode_t;
+
+typedef enum sdp_media {
+	SDP_MEDIA_TYPE_NULL = 0,
+	SDP_MEDIA_TYPE_AUDIO,
+	SDP_MEDIA_TYPE_VIDEO,
+	SDP_MEDIA_TYPE_TEXT,
+	SDP_MEDIA_TYPE_APPLICATION,
+	SDP_MEDIA_TYPE_MESSAGE
+} sdp_media_type_t;
+
+// Codecs recognized by SDP parser
+typedef enum sdp_codec {
+	SDP_CODEC_NULL = 0,
+	SDP_CODEC_H264,
+	SDP_CODEC_VP9
+} sdp_codec_t;
+
+// Dynamic payload type
+typedef struct sdp_rtpmap {
+	unsigned int      type;             // Dynamic RTP payload type (e.g. 96)
+	enum sdp_codec    codec;            // H264, VP9, etc.
+	unsigned int      clock;            // Typically 90kHz for video
+	unsigned int      flags;
+} sdp_rtpmap_t;
+
+typedef struct sdp {
+	// protocol version
+	uint8_t version;
+
+	// originator and session identifier
+	char username[SDP_MAX_USERNAME_SIZE+1];
+	char session_id[SDP_MAX_SESSION_ID_SIZE+1];
+	char session_version[SDP_MAX_SESSION_VERSION_SIZE+1];
+
+	// session name
+	char session_name[SDP_MAX_SESSION_NAME_SIZE+1];
+
+	// time description (mandatory)
+	uint64_t start_time;
+	uint64_t stop_time;
+
+	// session attributes
+	
+	// bundle media identification tags
+	char mid[SDP_MAX_BUNDLE_IDS][SDP_MAX_BUNDLE_ID_SIZE+1];
+	
+	// ice
+	char ufrag[4*256];					// ice-ufrag (256 unicode chars max.)
+	char pwd[4*256];					// ice-pwd (256 unicode chars max.)
+	struct {
+		bool trickle;
+	} ice_options;
+
+	// video media
+	struct {
+		uint16_t port;
+		struct sdp_rtpmap params[SDP_MAX_RTP_PAYLOAD_TYPES];
+		int count;
+	} video;
+
+	sdp_mode_t mode;					// send, receive, and send-and-receive
+
+	bool rtcp_mux;						// is rtcp multiplexed on same socket
+	bool rtcp_rsize;
+
+	union {
+		uint8_t sha256[32];				// certificate fingerprint
+	} fingerprint;
+
+} sdp_t;
+
+
+/**
+ * Parse SDP string into structure
+ *
+ * \param dst[out] SDP structure
+ * \param src[in] NULL-terminated SDP string
+ *
+ * \return 0 on success, negative on error.
+ */
+int sdp_parse(struct sdp *dst, const char *src);
+
+/**
+ * Serialize SDP structure into string
+ *
+ * \param dst[out] NULL-terminated SDP string
+ * \param len[in] Capacity of dst
+ * \param src[in] SDP structure
+ *
+ * \return 0 on success, negative on error.
+ */
+int sdp_serialize(char *dst, size_t len, const struct sdp *src);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _URTC_SDP_H */