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/**
* 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 */
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