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113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/* @(#) interface to RTP-protocol parsing functions for udpxy
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*
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* Copyright 2008-2011 Pavel V. Cherenkov (pcherenkov@gmail.com)
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*
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* This file is part of udpxy.
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*
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* udpxy 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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* udpxy 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 udpxy. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef RTPH_UDPXY_021308
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#define RTPH_UDPXY_021308
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#include <sys/types.h>
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static const int MPEG_TS_SIG = 0x47;
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static const size_t RTP_MIN_SIZE = 4;
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static const size_t RTP_HDR_SIZE = 12; /* RFC 3550 */
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static const int RTP_VER2 = 0x02;
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/* offset to header extension and extension length,
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* as per RFC 3550 5.3.1 */
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static const size_t XTLEN_OFFSET = 14;
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static const size_t XTSIZE = 4;
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/* minimum length to determine size of an extended RTP header
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*/
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#define RTP_XTHDRLEN (XTLEN_OFFSET + XTSIZE)
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static const size_t CSRC_SIZE = 4;
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/* MPEG payload-type constants - adopted from VLC 0.8.6 */
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#define P_MPGA 0x0E /* MPEG audio */
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#define P_MPGV 0x20 /* MPEG video */
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#define P_MPGTS 0x21 /* MPEG TS */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* check if the buffer is an RTP packet
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*
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* @param buf buffer to analyze
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* @param len size of the buffer
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* @param is_rtp variable to set to 1 if data is an RTP packet
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* @param log log file
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*
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* @return 0 if there was no error, -1 otherwise
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*/
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int RTP_check( const char* buf, const size_t len, int* is_rtp, FILE* log );
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/* process RTP package to retrieve the payload: set
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* pbuf to the start of the payload area; set len to
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* be equal payload's length
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*
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* @param pbuf address of pointer to beginning of RTP packet
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* @param len pointer to RTP packet's length
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* @param verify verify that it is an RTP packet if != 0
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* @param log log file
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*
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* @return 0 if there was no error, -1 otherwise;
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* set pbuf to point to beginning of payload and len
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* be payload size in bytes
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*/
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int RTP_process( void** pbuf, size_t* len, int verify, FILE* log );
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/* verify if buffer contains an RTP packet, 0 otherwise
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*
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* @param buf buffer to analyze
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* @param len size of the buffer
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* @param log error log
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*
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* @return 1 if buffer contains an RTP packet, 0 otherwise
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*/
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int RTP_verify( const char* buf, const size_t len, FILE* log );
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/* calculate length of an RTP header
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*
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* @param buf buffer to analyze
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* @param len size of the buffer
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* @param hdrlen pointer to header length variable
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* @param log error log
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*
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* @return 0 if header length has been calculated,
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* ENOMEM if buffer is not big enough
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*/
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int RTP_hdrlen( const char* buf, const size_t len, size_t* hdrlen,
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FILE* log );
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#ifdef __cplusplus
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}
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#endif
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#endif /* RTPH_UDPXY_021308 */
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/* __EOF__ */
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