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/**
* Copyright (c) 2019-2021 Chris Hiszpanski. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*/
#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 */
/* vim: set expandtab ts=8 sw=4 tw=0 : */
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