diff options
Diffstat (limited to 'main/sdp_state.c')
| -rw-r--r-- | main/sdp_state.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/main/sdp_state.c b/main/sdp_state.c index 853450149..b058d7f9b 100644 --- a/main/sdp_state.c +++ b/main/sdp_state.c @@ -1204,6 +1204,37 @@ void ast_sdp_state_set_t38_parameters(struct ast_sdp_state *sdp_state, stream_state->t38_local_params = *params; } +/*! + * \brief Add SSRC-level attributes if appropriate. + * + * This function does nothing if the SDP options indicate not to add SSRC-level attributes. + * + * Currently, the only attribute added is cname, which is retrieved from the RTP instance. + * + * \param m_line The m_line on which to add the SSRC attributes + * \param options Options that indicate what, if any, SSRC attributes to add + * \param rtp RTP instance from which we get SSRC-level information + */ +static void add_ssrc_attributes(struct ast_sdp_m_line *m_line, const struct ast_sdp_options *options, + struct ast_rtp_instance *rtp) +{ + struct ast_sdp_a_line *a_line; + char attr_buffer[128]; + + if (!ast_sdp_options_get_ssrc(options)) { + return; + } + + snprintf(attr_buffer, sizeof(attr_buffer), "%u cname:%s", ast_rtp_instance_get_ssrc(rtp), + ast_rtp_instance_get_cname(rtp)); + + a_line = ast_sdp_a_alloc("ssrc", attr_buffer); + if (!a_line) { + return; + } + ast_sdp_m_add_a(m_line, a_line); +} + static int sdp_add_m_from_rtp_stream(struct ast_sdp *sdp, const struct ast_sdp_state *sdp_state, const struct ast_sdp_options *options, const struct sdp_state_capabilities *capabilities, int stream_index) { @@ -1335,6 +1366,8 @@ static int sdp_add_m_from_rtp_stream(struct ast_sdp *sdp, const struct ast_sdp_s return -1; } + add_ssrc_attributes(m_line, options, rtp); + if (ast_sdp_add_m(sdp, m_line)) { ast_sdp_m_free(m_line); return -1; |