DTX DL: use FSM for AMR

Use dedicated FSM to handle all DTX DL related events:
- add explicit checks if DTX DL is enabled (fixes regression for non-DTX
setup introduced in 654175f33bd412671e3ef8cdd65c0689d10f278c)
- fix handling of AMR CMI for SPEECH frames
- add FSM for DTX DL
- sync with corresponding changes in OpenBSC's
- handle FACCH-related DTX ONSET events

This affects both lc15 and sysmobts and requires corresponding change in
OpenBSC (Change-Id: Idac8609faf9b5ced818fde899ccfc6ed0c42e8fd).

Change-Id: I74a0b42cb34d525b8a70d264135e82994ca70d31

1 files changed, 4 insertions, 5 deletions

diff --git a/include/osmo-bts/msg_utils.h b/include/osmo-bts/msg_utils.h
index f99f3c40..31bd1725 100644
--- a/include/osmo-bts/msg_utils.h
+++ b/include/osmo-bts/msg_utils.h
@@ -26,12 +26,11 @@ enum {
 };
 
 void lchan_set_marker(bool t, struct gsm_lchan *lchan);
-void save_last_sid(struct gsm_lchan *lchan, const uint8_t *l1_payload,
-		   size_t length, uint32_t fn, int update, uint8_t cmr,
-		   int8_t cmi);
-int dtx_amr_check_onset(struct gsm_lchan *lchan, const uint8_t *rtp_pl,
+void dtx_cache_payload(struct gsm_lchan *lchan, const uint8_t *l1_payload,
+		       size_t length, uint32_t fn, int update);
+int dtx_dl_amr_fsm_step(struct gsm_lchan *lchan, const uint8_t *rtp_pl,
 			size_t rtp_pl_len, uint32_t fn, uint8_t *l1_payload,
-			uint8_t *ft_out);
+			bool marker, uint8_t *len, uint8_t *ft_out);
 uint8_t repeat_last_sid(struct gsm_lchan *lchan, uint8_t *dst, uint32_t fn);
 int msg_verify_ipa_structure(struct msgb *msg);
 int msg_verify_oml_structure(struct msgb *msg);