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Add RTP bug flag "RTP_BUG_CHANGE_SSRC_ON_MARKER_ALSO_WHEN_SECURE" to allow SSRC change when using SRTP 

Fixes signalwire/freeswitch#2361, where a jump backwards in RTP timestamps caused silence at the start of calls when switching from generated ringback to remote media.
This commit is contained in:
Anton Olofsson 2024-01-23 16:32:29 +01:00
parent d3c60820d7
commit cca18c7b7e
3 changed files with 19 additions and 3 deletions
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9
src/include/switch_types.h
View File

@ -964,13 +964,20 @@ typedef enum {
*/
RTP_BUG_ALWAYS_AUTO_ADJUST = (1 << 12)
RTP_BUG_ALWAYS_AUTO_ADJUST = (1 << 12),
/*
Leave the auto-adjust behavior enableed permenantly rather than only at appropriate times. (IMPLICITLY sets RTP_BUG_ACCEPT_ANY_PACKETS)
*/
RTP_BUG_CHANGE_SSRC_ON_MARKER_ALSO_WHEN_SECURE = (1 << 13),
/*
Allow SSRC change when using SRTP.
*/
} switch_rtp_bug_flag_t;
#ifdef _MSC_VER

8
src/switch_core_media.c
View File

@ -1010,6 +1010,14 @@ SWITCH_DECLARE(void) switch_core_media_parse_rtp_bugs(switch_rtp_bug_flag_t *fla
*flag_pole &= ~RTP_BUG_CHANGE_SSRC_ON_MARKER;
}
if (switch_stristr("CHANGE_SSRC_ON_MARKER_ALSO_WHEN_SECURE", str)) {
*flag_pole |= RTP_BUG_CHANGE_SSRC_ON_MARKER_ALSO_WHEN_SECURE;
}
if (switch_stristr("~CHANGE_SSRC_ON_MARKER_ALSO_WHEN_SECURE", str)) {
*flag_pole &= ~RTP_BUG_CHANGE_SSRC_ON_MARKER_ALSO_WHEN_SECURE;
}
if (switch_stristr("FLUSH_JB_ON_DTMF", str)) {
*flag_pole |= RTP_BUG_FLUSH_JB_ON_DTMF;
}

5
src/switch_rtp.c
View File

@ -8215,7 +8215,7 @@ static int rtp_common_write(switch_rtp_t *rtp_session,
int delta = rtp_session->ts - rtp_session->last_write_ts;
if (!rtp_session->flags[SWITCH_RTP_FLAG_UDPTL] &&
((!rtp_session->flags[SWITCH_RTP_FLAG_RESET] && (abs(delta) > rtp_session->samples_per_interval * 10))
((rtp_session->flags[SWITCH_RTP_FLAG_RESET] && (abs(delta) > rtp_session->samples_per_interval * 10))
|| rtp_session->ts == rtp_session->samples_per_interval)) {
m++;
}
@ -8251,7 +8251,8 @@ static int rtp_common_write(switch_rtp_t *rtp_session,
}
/* If the marker was set, and the timestamp seems to have started over - set a new SSRC, to indicate this is a new stream */
if (m && !switch_rtp_test_flag(rtp_session, SWITCH_RTP_FLAG_SECURE_SEND) && (rtp_session->rtp_bugs & RTP_BUG_CHANGE_SSRC_ON_MARKER) &&
if (m && (rtp_session->rtp_bugs & RTP_BUG_CHANGE_SSRC_ON_MARKER) &&
(!switch_rtp_test_flag(rtp_session, SWITCH_RTP_FLAG_SECURE_SEND) || rtp_session->rtp_bugs & RTP_BUG_CHANGE_SSRC_ON_MARKER_ALSO_WHEN_SECURE) &&
(rtp_session->flags[SWITCH_RTP_FLAG_RESET] || (rtp_session->ts <= rtp_session->last_write_ts && rtp_session->last_write_ts > 0))) {
switch_rtp_set_ssrc(rtp_session, (uint32_t) ((intptr_t) rtp_session + (switch_time_t) switch_epoch_time_now(NULL)));
}