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#ifndef _RTPLIB_H_
#define _RTPLIB_H_
#include <stdint.h>
#include <stdbool.h>
#include "str.h"
#include "containers.h"
typedef const struct codec_def_s codec_def_t;
struct rtp_header {
unsigned char v_p_x_cc;
unsigned char m_pt;
uint16_t seq_num;
uint32_t timestamp;
uint32_t ssrc;
uint32_t csrc[];
} __attribute__ ((packed));
enum evs_bw {
EVS_BW_NB = 0,
EVS_BW_WB = 1,
EVS_BW_SWB = 2,
EVS_BW_FB = 3,
__EVS_BW_MAX,
EVS_BW_UNSPEC = -1,
};
union codec_format_options {
struct {
int interleaving;
unsigned int mode_set; // bitfield
int mode_change_period;
unsigned int octet_aligned:1;
unsigned int crc:1;
unsigned int robust_sorting:1;
unsigned int mode_change_neighbor:1;
} amr;
struct {
int mode;
} ilbc;
struct {
// EVS options
unsigned int min_br, max_br;
unsigned int min_br_send, max_br_send;
unsigned int min_br_recv, max_br_recv;
enum evs_bw min_bw, max_bw;
enum evs_bw min_bw_send, max_bw_send;
enum evs_bw min_bw_recv, max_bw_recv;
// AMR options
unsigned int mode_set; // bitfield
int mode_change_period;
// bit field options
unsigned int hf_only:1;
unsigned int amr_io:1;
unsigned int no_dtx:1;
unsigned int no_dtx_recv:1;
int cmr:2; // -1, 0, 1
// AMR bit options
unsigned int mode_change_neighbor:1;
} evs;
struct {
// 0 = default, 1 = set, -1 = not set (0)
int stereo_recv:2;
int stereo_send:2;
int fec_recv:2;
int fec_send:2;
// these are parsed out but ignored
int cbr:2;
int usedtx:2;
int maxplaybackrate;
int sprop_maxcapturerate;
int maxaveragebitrate;
int minptime; // obsolete
} opus;
};
struct rtp_codec_format {
union codec_format_options parsed;
bool fmtp_parsed:1; // set if fmtp string was successfully parsed
};
struct rtp_payload_type;
TYPED_GQUEUE(rtp_pt, struct rtp_payload_type)
G_DEFINE_AUTO_CLEANUP_CLEAR_FUNC(rtp_pt_q, rtp_pt_q_clear)
struct rtp_payload_type {
int payload_type;
int reverse_payload_type;
str encoding_with_params; // "opus/48000/2"
str encoding_with_full_params; // "opus/48000/1"
str encoding; // "opus"
unsigned int clock_rate; // 48000
str encoding_parameters; // "2"
int channels; // 2
str format_parameters; // value of a=fmtp
str codec_opts; // extra codec-specific options
GQueue rtcp_fb; // a=rtcp-fb:...
int ptime; // default from RFC
int bitrate;
codec_def_t *codec_def;
rtp_pt_list *prefs_link; // link in `codec_prefs` list
struct rtp_codec_format format; // parsed out fmtp
unsigned int for_transcoding:1;
unsigned int accepted:1;
unsigned int removed:1;
};
extern const struct rtp_payload_type rfc_rtp_payload_types[];
extern const int num_rfc_rtp_payload_types;
int rtp_payload(struct rtp_header **out, str *p, const str *s);
int rtp_padding(const struct rtp_header *header, str *payload);
const struct rtp_payload_type *rtp_get_rfc_payload_type(unsigned int type);
const struct rtp_payload_type *rtp_get_rfc_codec(const str *codec);
// if not `exact` then also returns true if `a` is compatible with `b`
// matches all params
__attribute__((nonnull(1, 2)))
bool rtp_payload_type_eq_exact(const struct rtp_payload_type *a, const struct rtp_payload_type *b);
__attribute__((nonnull(1, 2)))
bool rtp_payload_type_eq_compat(const struct rtp_payload_type *a, const struct rtp_payload_type *b);
// matches only basic params but not payload type number
__attribute__((nonnull(1, 2)))
bool rtp_payload_type_fmt_eq_nf(const struct rtp_payload_type *a, const struct rtp_payload_type *b);
// matches only basic params and payload type number
__attribute__((nonnull(1, 2)))
bool rtp_payload_type_eq_nf(const struct rtp_payload_type *, const struct rtp_payload_type *);
// matches all params except payload type number
__attribute__((nonnull(1, 2)))
int rtp_payload_type_fmt_cmp(const struct rtp_payload_type *a, const struct rtp_payload_type *b);
__attribute__((nonnull(1, 2)))
bool rtp_payload_type_fmt_eq_exact(const struct rtp_payload_type *a, const struct rtp_payload_type *b);
__attribute__((nonnull(1, 2)))
bool rtp_payload_type_fmt_eq_compat(const struct rtp_payload_type *a, const struct rtp_payload_type *b);
#endif
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