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113 lines
3.0 KiB
C
113 lines
3.0 KiB
C
/** rtp.h
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*
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* Copyright (C) 2013-2015 Tox project All Rights Reserved.
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*
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* This file is part of Tox.
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*
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* Tox is free software: you can redistribute it and/or modify
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* it under the terms of the GNU 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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* Tox 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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Tox. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef RTP_H
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#define RTP_H
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#include "bwcontroller.h"
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#include "../toxcore/Messenger.h"
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#include "../toxcore/logger.h"
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#include <stdbool.h>
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/**
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* Payload type identifier. Also used as rtp callback prefix.
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*/
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enum {
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rtp_TypeAudio = 192,
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rtp_TypeVideo,
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};
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struct RTPHeader {
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/* Standard RTP header */
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#ifndef WORDS_BIGENDIAN
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uint16_t cc: 4; /* Contributing sources count */
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uint16_t xe: 1; /* Extra header */
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uint16_t pe: 1; /* Padding */
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uint16_t ve: 2; /* Version */
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uint16_t pt: 7; /* Payload type */
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uint16_t ma: 1; /* Marker */
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#else
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uint16_t ve: 2; /* Version */
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uint16_t pe: 1; /* Padding */
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uint16_t xe: 1; /* Extra header */
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uint16_t cc: 4; /* Contributing sources count */
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uint16_t ma: 1; /* Marker */
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uint16_t pt: 7; /* Payload type */
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#endif
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uint16_t sequnum;
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uint32_t timestamp;
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uint32_t ssrc;
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uint32_t csrc[16];
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/* Non-standard TOX-specific fields */
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uint16_t cpart;/* Data offset of the current part */
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uint16_t tlen; /* Total message lenght */
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} __attribute__((packed));
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/* Check alignment */
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typedef char __fail_if_misaligned_1 [ sizeof(struct RTPHeader) == 80 ? 1 : -1 ];
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struct RTPMessage {
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uint16_t len;
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struct RTPHeader header;
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uint8_t data[];
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} __attribute__((packed));
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/* Check alignment */
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typedef char __fail_if_misaligned_2 [ sizeof(struct RTPMessage) == 82 ? 1 : -1 ];
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/**
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* RTP control session.
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*/
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typedef struct {
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uint8_t payload_type;
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uint16_t sequnum; /* Sending sequence number */
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uint16_t rsequnum; /* Receiving sequence number */
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uint32_t rtimestamp;
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uint32_t ssrc;
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struct RTPMessage *mp; /* Expected parted message */
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Messenger *m;
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uint32_t friend_number;
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BWController *bwc;
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void *cs;
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int (*mcb)(void *, struct RTPMessage *msg);
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} RTPSession;
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RTPSession *rtp_new(int payload_type, Messenger *m, uint32_t friendnumber,
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BWController *bwc, void *cs,
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int (*mcb)(void *, struct RTPMessage *));
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void rtp_kill(RTPSession *session);
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int rtp_allow_receiving(RTPSession *session);
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int rtp_stop_receiving(RTPSession *session);
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int rtp_send_data(RTPSession *session, const uint8_t *data, uint16_t length, Logger *log);
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#endif /* RTP_H */
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