rtp_parser_err_t
rtp_packet_parse(struct rtp_packet *pkt)
{
int padding_size;
rtp_hdr_ext_t *hdr_ext_ptr;
padding_size = 0;
pkt->data_size = 0;
pkt->data_offset = 0;
pkt->appendable = 1;
pkt->nsamples = RTP_NSAMPLES_UNKNOWN;
if (pkt->size < sizeof(pkt->data.header))
return RTP_PARSER_PTOOSHRT;
if (pkt->data.header.version != 2)
return RTP_PARSER_IHDRVER;
pkt->data_offset = RTP_HDR_LEN(&pkt->data.header);
if (pkt->data.header.x != 0) {
if (pkt->size < pkt->data_offset + sizeof(*hdr_ext_ptr))
return RTP_PARSER_PTOOSHRTXS;
hdr_ext_ptr = (rtp_hdr_ext_t *)&pkt->data.buf[pkt->data_offset];
pkt->data_offset += sizeof(rtp_hdr_ext_t) +
(ntohs(hdr_ext_ptr->length) * sizeof(hdr_ext_ptr->extension[0]));
}
if (pkt->size < pkt->data_offset)
return RTP_PARSER_PTOOSHRTXH;
if (pkt->data.header.p != 0) {
if (pkt->data_offset == pkt->size)
return RTP_PARSER_PTOOSHRTPS;
padding_size = pkt->data.buf[pkt->size - 1];
if (padding_size == 0)
return RTP_PARSER_IPS;
}
if (pkt->size < pkt->data_offset + padding_size)
return RTP_PARSER_PTOOSHRTP;
pkt->data_size = pkt->size - pkt->data_offset - padding_size;
pkt->ts = ntohl(pkt->data.header.ts);
pkt->seq = ntohs(pkt->data.header.seq);
if (pkt->data_size == 0)
return RTP_PARSER_OK;
pkt->nsamples = rtp_calc_samples(pkt->data.header.pt, pkt->data_size,
&pkt->data.buf[pkt->data_offset]);
/*
* G.729 comfort noise frame as the last frame causes
* packet to be non-appendable
*/
if (pkt->data.header.pt == RTP_G729 && (pkt->data_size % 10) != 0)
pkt->appendable = 0;
return RTP_PARSER_OK;
}
rtp_parser_err_t
rtp_packet_parse_raw(unsigned char *buf, size_t size, struct rtp_info *rinfo)
{
int padding_size;
rtp_hdr_ext_t *hdr_ext_ptr;
rtp_hdr_t *header;
header = (rtp_hdr_t *)buf;
padding_size = 0;
rinfo->data_size = 0;
rinfo->data_offset = 0;
rinfo->appendable = 1;
rinfo->nsamples = RTP_NSAMPLES_UNKNOWN;
if (size < sizeof(*header))
return RTP_PARSER_PTOOSHRT;
if (header->version != 2)
return RTP_PARSER_IHDRVER;
rinfo->data_offset = RTP_HDR_LEN(header);
if (header->x != 0) {
if (size < rinfo->data_offset + sizeof(*hdr_ext_ptr))
return RTP_PARSER_PTOOSHRTXS;
hdr_ext_ptr = (rtp_hdr_ext_t *)&buf[rinfo->data_offset];
rinfo->data_offset += sizeof(rtp_hdr_ext_t) +
(ntohs(hdr_ext_ptr->length) * sizeof(hdr_ext_ptr->extension[0]));
}
if (size < rinfo->data_offset)
return RTP_PARSER_PTOOSHRTXH;
if (header->p != 0) {
if (rinfo->data_offset == size)
return RTP_PARSER_PTOOSHRTPS;
padding_size = buf[size - 1];
if (padding_size == 0)
return RTP_PARSER_IPS;
}
if (size < rinfo->data_offset + padding_size)
return RTP_PARSER_PTOOSHRTP;
rinfo->data_size = size - rinfo->data_offset - padding_size;
rinfo->ts = ntohl(header->ts);
rinfo->seq = ntohs(header->seq);
rinfo->ssrc = ntohl(header->ssrc);
rinfo->rtp_profile = &rtp_profiles[header->pt];
if (rinfo->data_size == 0)
return RTP_PARSER_OK;
rinfo->nsamples = rtp_calc_samples(header->pt, rinfo->data_size,
&buf[rinfo->data_offset]);
/*
* G.729 comfort noise frame as the last frame causes
* packet to be non-appendable
*/
if (header->pt == RTP_G729 && (rinfo->data_size % 10) != 0)
rinfo->appendable = 0;
return RTP_PARSER_OK;
}