539 lines
15 KiB
C
539 lines
15 KiB
C
/* Traffic channel support for NuRAN Wireless OC-2G BTS L1 */
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/* Copyright (C) 2015 by Yves Godin <support@nuranwireless.com>
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*
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* Based on sysmoBTS:
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* (C) 2011-2012 by Harald Welte <laforge@gnumonks.org>
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*
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <stdint.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/select.h>
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#include <osmocom/core/timer.h>
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#include <osmocom/core/bits.h>
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#include <osmocom/gsm/gsm_utils.h>
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#include <osmo-bts/logging.h>
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#include <osmo-bts/bts.h>
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#include <osmo-bts/gsm_data.h>
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#include <osmo-bts/msg_utils.h>
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#include <osmo-bts/measurement.h>
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#include <osmo-bts/amr.h>
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#include <osmo-bts/l1sap.h>
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#include <osmo-bts/dtx_dl_amr_fsm.h>
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#include <nrw/oc2g/oc2g.h>
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#include <nrw/oc2g/gsml1prim.h>
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#include <nrw/oc2g/gsml1const.h>
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#include <nrw/oc2g/gsml1types.h>
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#include "oc2gbts.h"
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#include "l1_if.h"
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static struct msgb *l1_to_rtppayload_fr(uint8_t *l1_payload, uint8_t payload_len,
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struct gsm_lchan *lchan)
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{
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struct msgb *msg;
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uint8_t *cur;
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msg = msgb_alloc_headroom(1024, 128, "L1P-to-RTP");
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if (!msg)
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return NULL;
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/* new L1 can deliver bits like we need them */
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cur = msgb_put(msg, GSM_FR_BYTES);
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memcpy(cur, l1_payload, GSM_FR_BYTES);
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lchan_set_marker(osmo_fr_check_sid(l1_payload, payload_len), lchan);
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return msg;
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}
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/*! \brief convert GSM-FR from RTP payload to L1 format
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* \param[out] l1_payload payload part of L1 buffer
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* \param[in] rtp_payload pointer to RTP payload data
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* \param[in] payload_len length of \a rtp_payload
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* \returns number of \a l1_payload bytes filled
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*/
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static int rtppayload_to_l1_fr(uint8_t *l1_payload, const uint8_t *rtp_payload,
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unsigned int payload_len)
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{
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/* new L1 can deliver bits like we need them */
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memcpy(l1_payload, rtp_payload, GSM_FR_BYTES);
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return GSM_FR_BYTES;
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}
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static struct msgb *l1_to_rtppayload_efr(uint8_t *l1_payload,
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uint8_t payload_len,
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struct gsm_lchan *lchan)
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{
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struct msgb *msg;
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uint8_t *cur;
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msg = msgb_alloc_headroom(1024, 128, "L1P-to-RTP");
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if (!msg)
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return NULL;
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/* new L1 can deliver bits like we need them */
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cur = msgb_put(msg, GSM_EFR_BYTES);
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memcpy(cur, l1_payload, GSM_EFR_BYTES);
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enum osmo_amr_type ft;
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enum osmo_amr_quality bfi;
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uint8_t cmr;
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int8_t sti, cmi;
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osmo_amr_rtp_dec(l1_payload, payload_len, &cmr, &cmi, &ft, &bfi, &sti);
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lchan_set_marker(ft == AMR_GSM_EFR_SID, lchan);
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return msg;
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}
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static int rtppayload_to_l1_efr(uint8_t *l1_payload, const uint8_t *rtp_payload,
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unsigned int payload_len)
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{
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memcpy(l1_payload, rtp_payload, payload_len);
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return payload_len;
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}
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static struct msgb *l1_to_rtppayload_hr(uint8_t *l1_payload, uint8_t payload_len,
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struct gsm_lchan *lchan)
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{
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struct msgb *msg;
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uint8_t *cur;
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msg = msgb_alloc_headroom(1024, 128, "L1P-to-RTP");
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if (!msg)
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return NULL;
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if (payload_len != GSM_HR_BYTES) {
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LOGP(DL1P, LOGL_ERROR, "L1 HR frame length %u != expected %u\n",
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payload_len, GSM_HR_BYTES);
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return NULL;
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}
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cur = msgb_put(msg, GSM_HR_BYTES);
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memcpy(cur, l1_payload, GSM_HR_BYTES);
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lchan_set_marker(osmo_hr_check_sid(l1_payload, payload_len), lchan);
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return msg;
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}
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/*! \brief convert GSM-FR from RTP payload to L1 format
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* \param[out] l1_payload payload part of L1 buffer
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* \param[in] rtp_payload pointer to RTP payload data
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* \param[in] payload_len length of \a rtp_payload
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* \returns number of \a l1_payload bytes filled
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*/
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static int rtppayload_to_l1_hr(uint8_t *l1_payload, const uint8_t *rtp_payload,
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unsigned int payload_len)
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{
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if (payload_len != GSM_HR_BYTES) {
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LOGP(DL1P, LOGL_ERROR, "RTP HR frame length %u != expected %u\n",
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payload_len, GSM_HR_BYTES);
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return 0;
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}
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memcpy(l1_payload, rtp_payload, GSM_HR_BYTES);
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return GSM_HR_BYTES;
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}
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static struct msgb *l1_to_rtppayload_amr(uint8_t *l1_payload, uint8_t payload_len,
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struct gsm_lchan *lchan)
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{
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struct msgb *msg;
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uint8_t amr_if2_len = payload_len - 2;
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uint8_t *cur;
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msg = msgb_alloc_headroom(1024, 128, "L1P-to-RTP");
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if (!msg)
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return NULL;
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cur = msgb_put(msg, amr_if2_len);
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memcpy(cur, l1_payload+2, amr_if2_len);
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/*
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* Audiocode's MGW doesn't like receiving CMRs that are not
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* the same as the previous one. This means we need to patch
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* the content here.
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*/
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if ((cur[0] & 0xF0) == 0xF0)
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cur[0]= lchan->tch.last_cmr << 4;
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else
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lchan->tch.last_cmr = cur[0] >> 4;
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return msg;
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}
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/*! \brief convert AMR from RTP payload to L1 format
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* \param[out] l1_payload payload part of L1 buffer
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* \param[in] rtp_payload pointer to RTP payload data
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* \param[in] payload_len length of \a rtp_payload
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* \returns number of \a l1_payload bytes filled
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*/
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static int rtppayload_to_l1_amr(uint8_t *l1_payload, const uint8_t *rtp_payload,
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uint8_t payload_len, uint8_t ft)
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{
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memcpy(l1_payload, rtp_payload, payload_len);
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return payload_len;
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}
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#define RTP_MSGB_ALLOC_SIZE 512
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/*! \brief function for incoming RTP via TCH.req
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* \param[in] rtp_pl buffer containing RTP payload
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* \param[in] rtp_pl_len length of \a rtp_pl
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* \param[in] use_cache Use cached payload instead of parsing RTP
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* \param[in] marker RTP header Marker bit (indicates speech onset)
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* \returns 0 if encoding result can be sent further to L1 without extra actions
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* positive value if data is ready AND extra actions are required
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* negative value otherwise (no data for L1 encoded)
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*
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* This function prepares a msgb with a L1 PH-DATA.req primitive and
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* queues it into lchan->dl_tch_queue.
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*
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* Note that the actual L1 primitive header is not fully initialized
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* yet, as things like the frame number, etc. are unknown at the time we
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* pre-fill the primtive.
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*/
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int l1if_tch_encode(struct gsm_lchan *lchan, uint8_t *data, uint8_t *len,
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const uint8_t *rtp_pl, unsigned int rtp_pl_len, uint32_t fn,
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bool use_cache, bool marker)
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{
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uint8_t *payload_type;
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uint8_t *l1_payload, ft;
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int rc = 0;
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bool is_sid = false;
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DEBUGP(DRTP, "%s RTP IN: %s\n", gsm_lchan_name(lchan),
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osmo_hexdump(rtp_pl, rtp_pl_len));
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payload_type = &data[0];
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l1_payload = &data[1];
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switch (lchan->tch_mode) {
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case GSM48_CMODE_SPEECH_V1:
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if (lchan->type == GSM_LCHAN_TCH_F) {
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*payload_type = GsmL1_TchPlType_Fr;
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rc = rtppayload_to_l1_fr(l1_payload,
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rtp_pl, rtp_pl_len);
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if (rc && lchan->ts->trx->bts->dtxd)
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is_sid = osmo_fr_check_sid(rtp_pl, rtp_pl_len);
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} else{
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*payload_type = GsmL1_TchPlType_Hr;
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rc = rtppayload_to_l1_hr(l1_payload,
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rtp_pl, rtp_pl_len);
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if (rc && lchan->ts->trx->bts->dtxd)
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is_sid = osmo_hr_check_sid(rtp_pl, rtp_pl_len);
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}
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if (is_sid)
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dtx_cache_payload(lchan, rtp_pl, rtp_pl_len, fn, -1);
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break;
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case GSM48_CMODE_SPEECH_EFR:
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*payload_type = GsmL1_TchPlType_Efr;
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rc = rtppayload_to_l1_efr(l1_payload, rtp_pl,
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rtp_pl_len);
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/* FIXME: detect and save EFR SID */
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break;
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case GSM48_CMODE_SPEECH_AMR:
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if (use_cache) {
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*payload_type = GsmL1_TchPlType_Amr;
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rtppayload_to_l1_amr(l1_payload, lchan->tch.dtx.cache,
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lchan->tch.dtx.len, ft);
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*len = lchan->tch.dtx.len + 1;
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return 0;
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}
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rc = dtx_dl_amr_fsm_step(lchan, rtp_pl, rtp_pl_len, fn,
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l1_payload, marker, len, &ft);
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if (rc < 0)
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return rc;
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if (!dtx_dl_amr_enabled(lchan)) {
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*payload_type = GsmL1_TchPlType_Amr;
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rtppayload_to_l1_amr(l1_payload + 2, rtp_pl, rtp_pl_len,
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ft);
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return 0;
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}
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/* DTX DL-specific logic below: */
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switch (lchan->tch.dtx.dl_amr_fsm->state) {
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case ST_ONSET_V:
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*payload_type = GsmL1_TchPlType_Amr_Onset;
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dtx_cache_payload(lchan, rtp_pl, rtp_pl_len, fn, 0);
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*len = 3;
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return 1;
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case ST_VOICE:
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*payload_type = GsmL1_TchPlType_Amr;
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rtppayload_to_l1_amr(l1_payload + 2, rtp_pl, rtp_pl_len,
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ft);
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return 0;
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case ST_SID_F1:
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if (lchan->type == GSM_LCHAN_TCH_H) { /* AMR HR */
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*payload_type = GsmL1_TchPlType_Amr_SidFirstP1;
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rtppayload_to_l1_amr(l1_payload + 2, rtp_pl,
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rtp_pl_len, ft);
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return 0;
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}
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/* AMR FR */
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*payload_type = GsmL1_TchPlType_Amr;
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rtppayload_to_l1_amr(l1_payload + 2, rtp_pl, rtp_pl_len,
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ft);
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return 0;
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case ST_SID_F2:
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*payload_type = GsmL1_TchPlType_Amr;
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rtppayload_to_l1_amr(l1_payload + 2, rtp_pl, rtp_pl_len,
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ft);
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return 0;
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case ST_F1_INH_V:
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*payload_type = GsmL1_TchPlType_Amr_SidFirstInH;
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*len = 3;
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dtx_cache_payload(lchan, rtp_pl, rtp_pl_len, fn, 0);
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return 1;
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case ST_U_INH_V:
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*payload_type = GsmL1_TchPlType_Amr_SidUpdateInH;
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*len = 3;
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dtx_cache_payload(lchan, rtp_pl, rtp_pl_len, fn, 0);
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return 1;
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case ST_SID_U:
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case ST_U_NOINH:
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return -EAGAIN;
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case ST_FACCH:
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return -EBADMSG;
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default:
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LOGP(DRTP, LOGL_ERROR, "Unhandled DTX DL AMR FSM state "
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"%d\n", lchan->tch.dtx.dl_amr_fsm->state);
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return -EINVAL;
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}
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break;
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default:
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/* we don't support CSD modes */
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rc = -1;
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break;
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}
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if (rc < 0) {
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LOGP(DRTP, LOGL_ERROR, "%s unable to parse RTP payload\n",
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gsm_lchan_name(lchan));
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return -EBADMSG;
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}
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*len = rc + 1;
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DEBUGP(DRTP, "%s RTP->L1: %s\n", gsm_lchan_name(lchan),
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osmo_hexdump(data, *len));
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return 0;
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}
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static int is_recv_only(uint8_t speech_mode)
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{
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return (speech_mode & 0xF0) == (1 << 4);
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}
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/*! \brief receive a traffic L1 primitive for a given lchan */
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int l1if_tch_rx(struct gsm_bts_trx *trx, uint8_t chan_nr, struct msgb *l1p_msg)
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{
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GsmL1_Prim_t *l1p = msgb_l1prim(l1p_msg);
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GsmL1_PhDataInd_t *data_ind = &l1p->u.phDataInd;
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uint8_t *payload, payload_type, payload_len;
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struct msgb *rmsg = NULL;
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struct gsm_lchan *lchan = &trx->ts[L1SAP_CHAN2TS(chan_nr)].lchan[l1sap_chan2ss(chan_nr)];
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if (is_recv_only(lchan->abis_ip.speech_mode))
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return -EAGAIN;
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if (data_ind->msgUnitParam.u8Size < 1) {
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LOGPLCFN(lchan, DL1P, LOGL_DEBUG, data_ind->u32Fn, "chan_nr %d Rx Payload size 0\n", chan_nr);
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/* Push empty payload to upper layers */
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rmsg = msgb_alloc_headroom(256, 128, "L1P-to-RTP");
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return add_l1sap_header(trx, rmsg, lchan, chan_nr, data_ind->u32Fn,
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data_ind->measParam.fBer * 10000,
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data_ind->measParam.fLinkQuality * 10, 0, 0, 0);
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}
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payload_type = data_ind->msgUnitParam.u8Buffer[0];
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payload = data_ind->msgUnitParam.u8Buffer + 1;
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payload_len = data_ind->msgUnitParam.u8Size - 1;
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/* clear RTP marker if the marker has previously sent */
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if (!lchan->tch.dtx.is_speech_resume)
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lchan->rtp_tx_marker = false;
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switch (payload_type) {
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case GsmL1_TchPlType_Fr:
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case GsmL1_TchPlType_Efr:
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if (lchan->type != GSM_LCHAN_TCH_F)
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goto err_payload_match;
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break;
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case GsmL1_TchPlType_Hr:
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if (lchan->type != GSM_LCHAN_TCH_H)
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goto err_payload_match;
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break;
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case GsmL1_TchPlType_Amr:
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if (lchan->type != GSM_LCHAN_TCH_H &&
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lchan->type != GSM_LCHAN_TCH_F)
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goto err_payload_match;
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break;
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case GsmL1_TchPlType_Amr_Onset:
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if (lchan->type != GSM_LCHAN_TCH_H &&
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lchan->type != GSM_LCHAN_TCH_F)
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goto err_payload_match;
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LOGPLCFN(lchan, DL1P, LOGL_DEBUG, data_ind->u32Fn, "DTX: received ONSET from L1 "
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"(%d bytes)\n", payload_len);
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/* according to 3GPP TS 26.093 ONSET frames precede the first
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speech frame of a speech burst - set the marker for next RTP
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frame */
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lchan->tch.dtx.is_speech_resume = true;
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lchan->rtp_tx_marker = true;
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break;
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case GsmL1_TchPlType_Amr_SidFirstP1:
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if (lchan->type != GSM_LCHAN_TCH_H)
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goto err_payload_match;
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LOGPLCFN(lchan, DL1P, LOGL_DEBUG, data_ind->u32Fn, "DTX: received SID_FIRST_P1 from L1 "
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"(%d bytes)\n", payload_len);
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break;
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case GsmL1_TchPlType_Amr_SidFirstP2:
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if (lchan->type != GSM_LCHAN_TCH_H)
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goto err_payload_match;
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LOGPLCFN(lchan, DL1P, LOGL_DEBUG, data_ind->u32Fn, "DTX: received SID_FIRST_P2 from L1 "
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"(%d bytes)\n", payload_len);
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break;
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case GsmL1_TchPlType_Amr_SidFirstInH:
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if (lchan->type != GSM_LCHAN_TCH_H)
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goto err_payload_match;
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lchan->tch.dtx.is_speech_resume = true;
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lchan->rtp_tx_marker = true;
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LOGPLCFN(lchan, DL1P, LOGL_DEBUG, data_ind->u32Fn, "DTX: received SID_FIRST_INH from L1 "
|
|
"(%d bytes)\n", payload_len);
|
|
break;
|
|
case GsmL1_TchPlType_Amr_SidUpdateInH:
|
|
if (lchan->type != GSM_LCHAN_TCH_H)
|
|
goto err_payload_match;
|
|
lchan->tch.dtx.is_speech_resume = true;
|
|
lchan->rtp_tx_marker = true;
|
|
LOGPLCFN(lchan, DL1P, LOGL_DEBUG, data_ind->u32Fn, "DTX: received SID_UPDATE_INH from L1 "
|
|
"(%d bytes)\n", payload_len);
|
|
break;
|
|
default:
|
|
LOGPLCFN(lchan, DL1P, LOGL_NOTICE, data_ind->u32Fn, "%s Rx Payload Type %s is unsupported\n",
|
|
gsm_lchan_name(lchan), get_value_string(oc2gbts_tch_pl_names, payload_type));
|
|
break;
|
|
}
|
|
|
|
LOGPLCHAN(lchan, DL1P, LOGL_DEBUG, "%s lchan->rtp_tx_marker = %s, len=%u\n",
|
|
get_value_string(oc2gbts_tch_pl_names, payload_type),
|
|
lchan->rtp_tx_marker ? "true" : "false", payload_len);
|
|
|
|
switch (payload_type) {
|
|
case GsmL1_TchPlType_Fr:
|
|
rmsg = l1_to_rtppayload_fr(payload, payload_len, lchan);
|
|
break;
|
|
case GsmL1_TchPlType_Hr:
|
|
rmsg = l1_to_rtppayload_hr(payload, payload_len, lchan);
|
|
break;
|
|
case GsmL1_TchPlType_Efr:
|
|
rmsg = l1_to_rtppayload_efr(payload, payload_len, lchan);
|
|
break;
|
|
case GsmL1_TchPlType_Amr:
|
|
case GsmL1_TchPlType_Amr_SidFirstP1:
|
|
rmsg = l1_to_rtppayload_amr(payload, payload_len, lchan);
|
|
break;
|
|
}
|
|
|
|
if (rmsg)
|
|
return add_l1sap_header(trx, rmsg, lchan, chan_nr, data_ind->u32Fn,
|
|
data_ind->measParam.fBer * 10000,
|
|
data_ind->measParam.fLinkQuality * 10, 0, 0, 0);
|
|
|
|
return 0;
|
|
|
|
err_payload_match:
|
|
LOGPLCFN(lchan, DL1P, LOGL_ERROR, data_ind->u32Fn, "%s Rx Payload Type %s incompatible with lchan\n",
|
|
gsm_lchan_name(lchan), get_value_string(oc2gbts_tch_pl_names, payload_type));
|
|
return -EINVAL;
|
|
}
|
|
|
|
struct msgb *gen_empty_tch_msg(struct gsm_lchan *lchan, uint32_t fn)
|
|
{
|
|
struct msgb *msg;
|
|
GsmL1_Prim_t *l1p;
|
|
GsmL1_PhDataReq_t *data_req;
|
|
GsmL1_MsgUnitParam_t *msu_param;
|
|
uint8_t *payload_type;
|
|
uint8_t *l1_payload;
|
|
int rc;
|
|
|
|
msg = l1p_msgb_alloc();
|
|
if (!msg)
|
|
return NULL;
|
|
|
|
l1p = msgb_l1prim(msg);
|
|
data_req = &l1p->u.phDataReq;
|
|
msu_param = &data_req->msgUnitParam;
|
|
payload_type = &msu_param->u8Buffer[0];
|
|
l1_payload = &msu_param->u8Buffer[1];
|
|
|
|
switch (lchan->tch_mode) {
|
|
case GSM48_CMODE_SPEECH_AMR:
|
|
if (lchan->type == GSM_LCHAN_TCH_H &&
|
|
dtx_dl_amr_enabled(lchan)) {
|
|
/* we have to explicitly handle sending SID FIRST P2 for
|
|
AMR HR in here */
|
|
*payload_type = GsmL1_TchPlType_Amr_SidFirstP2;
|
|
rc = dtx_dl_amr_fsm_step(lchan, NULL, 0, fn, l1_payload,
|
|
false, &(msu_param->u8Size),
|
|
NULL);
|
|
if (rc == 0)
|
|
return msg;
|
|
}
|
|
*payload_type = GsmL1_TchPlType_Amr;
|
|
break;
|
|
case GSM48_CMODE_SPEECH_V1:
|
|
if (lchan->type == GSM_LCHAN_TCH_F)
|
|
*payload_type = GsmL1_TchPlType_Fr;
|
|
else
|
|
*payload_type = GsmL1_TchPlType_Hr;
|
|
break;
|
|
case GSM48_CMODE_SPEECH_EFR:
|
|
*payload_type = GsmL1_TchPlType_Efr;
|
|
break;
|
|
default:
|
|
msgb_free(msg);
|
|
return NULL;
|
|
}
|
|
|
|
rc = repeat_last_sid(lchan, l1_payload, fn);
|
|
if (!rc) {
|
|
msgb_free(msg);
|
|
return NULL;
|
|
}
|
|
msu_param->u8Size = rc;
|
|
|
|
return msg;
|
|
}
|