96 lines
2.4 KiB
C
96 lines
2.4 KiB
C
#ifndef _RTP_PROXY_H
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#define _RTP_PROXY_H
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/* RTP proxy handling for ip.access nanoBTS */
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/* (C) 2009 by Harald Welte <laforge@gnumonks.org>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <netinet/in.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/select.h>
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#include <openbsc/mncc.h>
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#define RTP_PT_GSM_FULL 3
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#define RTP_PT_GSM_HALF 96
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#define RTP_PT_GSM_EFR 97
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#define RTP_PT_AMR 98
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#define RTP_LEN_GSM_FULL 33
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#define RTP_LEN_GSM_HALF 15
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#define RTP_LEN_GSM_EFR 31
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#define RTP_GSM_DURATION 160
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enum rtp_rx_action {
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RTP_NONE,
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RTP_PROXY,
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RTP_RECV_UPSTREAM,
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};
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enum rtp_tx_action {
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RTP_SEND_NONE,
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RTP_SEND_DOWNSTREAM,
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};
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struct rtp_sub_socket {
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struct sockaddr_in sin_local;
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struct sockaddr_in sin_remote;
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struct osmo_fd bfd;
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/* linked list of to-be-transmitted msgb's */
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struct llist_head tx_queue;
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};
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struct rtp_socket {
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struct llist_head list;
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struct rtp_sub_socket rtp;
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struct rtp_sub_socket rtcp;
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/* what should we do on receive? */
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enum rtp_rx_action rx_action;
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union {
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struct {
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struct rtp_socket *other_sock;
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} proxy;
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struct {
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struct gsm_network *net;
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uint32_t callref;
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} receive;
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};
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enum rtp_tx_action tx_action;
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struct {
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uint16_t sequence;
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uint32_t timestamp;
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uint32_t ssrc;
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struct timeval last_tv;
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} transmit;
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};
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struct rtp_socket *rtp_socket_create(void);
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int rtp_socket_bind(struct rtp_socket *rs, uint32_t ip);
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int rtp_socket_connect(struct rtp_socket *rs, uint32_t ip, uint16_t port);
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int rtp_socket_proxy(struct rtp_socket *this, struct rtp_socket *other);
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int rtp_socket_upstream(struct rtp_socket *this, struct gsm_network *net, uint32_t callref);
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int rtp_socket_free(struct rtp_socket *rs);
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int rtp_send_frame(struct rtp_socket *rs, struct gsm_data_frame *frame);
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#endif /* _RTP_PROXY_H */
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