From 42a833e89f443116fb165c35654c9f21ceed6876 Mon Sep 17 00:00:00 2001 From: Jacob Erlbeck Date: Mon, 14 Apr 2014 10:31:47 +0200 Subject: mgcp: Add packet size (ptime) conversion The current transcoder implemenation always does a 1:1 recoding concerning the duration of a packet. So RTP timestamps and sequence numbers are not modified. This is not sufficient in some cases, e.g. when the BTS does only allow for a single fixed ptime. This patch decouples encoding from decoding and moves the decoded samples to the state structure so that samples can be combined or drain according to the packaging of incoming and outgoing packets. This patch incorporates parts of Holger's experimental fixes in 0e669e05^..9eba68f9. Ticket: OW#1111 Sponsored-by: On-Waves ehf --- openbsc/src/libmgcp/mgcp_vty.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) (limited to 'openbsc/src/libmgcp/mgcp_vty.c') diff --git a/openbsc/src/libmgcp/mgcp_vty.c b/openbsc/src/libmgcp/mgcp_vty.c index 1f8a63ab7..26b570627 100644 --- a/openbsc/src/libmgcp/mgcp_vty.c +++ b/openbsc/src/libmgcp/mgcp_vty.c @@ -366,6 +366,26 @@ ALIAS_DEPRECATED(cfg_mgcp_rtp_ip_dscp, cfg_mgcp_rtp_ip_tos_cmd, RTP_STR "Apply IP_TOS to the audio stream\n" "The DSCP value\n") +#define FORCE_PTIME_STR "Force a fixed ptime for packets sent to the BTS" +DEFUN(cfg_mgcp_rtp_force_ptime, + cfg_mgcp_rtp_force_ptime_cmd, + "rtp force-ptime (10|20|40)", + RTP_STR FORCE_PTIME_STR + "The required ptime (packet duration) in ms\n") +{ + g_cfg->bts_force_ptime = atoi(argv[0]); + return CMD_SUCCESS; +} + +DEFUN(cfg_mgcp_no_rtp_force_ptime, + cfg_mgcp_no_rtp_force_ptime_cmd, + "no rtp force-ptime", + NO_STR RTP_STR FORCE_PTIME_STR) +{ + g_cfg->bts_force_ptime = 0; + return CMD_SUCCESS; +} + DEFUN(cfg_mgcp_sdp_fmtp_extra, cfg_mgcp_sdp_fmtp_extra_cmd, "sdp audio fmtp-extra .NAME", @@ -1123,6 +1143,8 @@ int mgcp_vty_init(void) install_element(MGCP_NODE, &cfg_mgcp_rtp_transcoder_base_cmd); install_element(MGCP_NODE, &cfg_mgcp_rtp_ip_dscp_cmd); install_element(MGCP_NODE, &cfg_mgcp_rtp_ip_tos_cmd); + install_element(MGCP_NODE, &cfg_mgcp_rtp_force_ptime_cmd); + install_element(MGCP_NODE, &cfg_mgcp_no_rtp_force_ptime_cmd); install_element(MGCP_NODE, &cfg_mgcp_rtp_keepalive_cmd); install_element(MGCP_NODE, &cfg_mgcp_rtp_keepalive_once_cmd); install_element(MGCP_NODE, &cfg_mgcp_no_rtp_keepalive_cmd); -- cgit v1.2.3