69 lines
1.7 KiB
C
69 lines
1.7 KiB
C
#ifndef _OSMUX_H_
|
|
#define _OSMUX_H_
|
|
|
|
/* OSmux header:
|
|
*
|
|
* ft (4 bits): 0=signalling, 1=voice (AMR-CMR)
|
|
* amr_cmr (4 bits): see cmr field in AMR header (RFC3267)
|
|
* circuit_id (8 bits): simplified version of RTP SSRC
|
|
* seq (8-bits): combination of RTP timestamp and seq. number
|
|
* amr_f (1-bits): AMR f bit (RFC3267)
|
|
* amr_ft (4-bits): AMR ft bit (RFC3267)
|
|
* amr_q (1-bits): AMR q bit (RFC3267)
|
|
* rtp_marker (1 bits): RTP marker
|
|
*/
|
|
|
|
#define OSMUX_FT_SIGNAL 0
|
|
#define OSMUX_FT_VOICE_AMR 1
|
|
|
|
struct osmux_hdr {
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
uint8_t ft:3,
|
|
ctr:3,
|
|
amr_f:1,
|
|
amr_q:1;
|
|
#elif __BYTE_ORDER == __LITTLE_ENDIAN
|
|
uint8_t amr_q:1,
|
|
amr_f:1,
|
|
ctr:3,
|
|
ft:3;
|
|
#endif
|
|
uint8_t seq;
|
|
uint8_t circuit_id;
|
|
#if __BYTE_ORDER == __BIG_ENDIAN
|
|
uint8_t amr_ft:4,
|
|
amr_cmr:4;
|
|
#elif __BYTE_ORDER == __LITTLE_ENDIAN
|
|
uint8_t amr_cmr:4,
|
|
amr_ft:4;
|
|
#endif
|
|
} __attribute__((packed));
|
|
|
|
/* one to handle all existing RTP flows */
|
|
struct osmux_in_handle {
|
|
uint8_t osmux_seq;
|
|
void (*deliver)(struct msgb *msg);
|
|
};
|
|
|
|
/* one per OSmux circuit_id, ie. one per RTP flow. */
|
|
struct osmux_out_handle {
|
|
uint16_t rtp_seq;
|
|
uint32_t rtp_timestamp;
|
|
};
|
|
|
|
static inline uint8_t *osmux_get_payload(struct osmux_hdr *osmuxh)
|
|
{
|
|
return (uint8_t *)osmuxh + sizeof(struct osmux_hdr);
|
|
}
|
|
|
|
void osmux_xfrm_input_init(struct osmux_in_handle *h);
|
|
int osmux_xfrm_input(struct msgb *msg);
|
|
void osmux_xfrm_input_deliver(struct osmux_in_handle *h);
|
|
|
|
int osmux_xfrm_output(struct osmux_hdr *osmuxh, struct osmux_out_handle *h, struct llist_head *list);
|
|
struct osmux_hdr *osmux_xfrm_output_pull(struct msgb *msg);
|
|
|
|
void osmux_tx_sched(struct llist_head *list, struct timeval *when, void (*tx_cb)(struct msgb *msg, void *data), void *data);
|
|
|
|
#endif
|