570 lines
16 KiB
C
570 lines
16 KiB
C
/* Traffic channel support for Sysmocom BTS L1 */
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/* (C) 2011 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 <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 <osmocom/trau/osmo_ortp.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/measurement.h>
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#include <sysmocom/femtobts/femtobts.h>
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#include <sysmocom/femtobts/gsml1prim.h>
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#include <sysmocom/femtobts/gsml1const.h>
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#include <sysmocom/femtobts/gsml1types.h>
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#include "femtobts.h"
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#include "l1_if.h"
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/* input octet-aligned, output not octet-aligned */
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void osmo_nibble_shift_right(uint8_t *out, const uint8_t *in,
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unsigned int num_nibbles)
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{
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unsigned int i;
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unsigned int num_whole_bytes = num_nibbles / 2;
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/* first byte: upper nibble empty, lower nibble from src */
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out[0] = (in[0] >> 4);
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/* bytes 1.. */
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for (i = 1; i < num_whole_bytes; i++)
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out[i] = ((in[i-1] & 0xF) << 4) | (in[i] >> 4);
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/* shift the last nibble, in case there's an odd count */
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i = num_whole_bytes;
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if (num_nibbles & 1)
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out[i] = ((in[i-1] & 0xF) << 4) | (in[i] >> 4);
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else
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out[i] = (in[i-1] & 0xF) << 4;
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}
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/* input unaligned, output octet-aligned */
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void osmo_nibble_shift_left_unal(uint8_t *out, const uint8_t *in,
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unsigned int num_nibbles)
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{
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unsigned int i;
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unsigned int num_whole_bytes = num_nibbles / 2;
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for (i = 0; i < num_whole_bytes; i++)
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out[i] = ((in[i] & 0xF) << 4) | (in[i+1] >> 4);
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/* shift the last nibble, in case there's an odd count */
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i = num_whole_bytes;
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if (num_nibbles & 1)
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out[i] = (in[i] & 0xF) << 4;
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}
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#define GSM_FR_BITS 260
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#define GSM_EFR_BITS 244
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#define GSM_FR_BYTES 33 /* TS 101318 Chapter 5.1: 260 bits + 4bit sig */
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#define GSM_HR_BYTES 14 /* TS 101318 Chapter 5.2: 112 bits, no sig */
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#define GSM_EFR_BYTES 31 /* TS 101318 Chapter 5.3: 244 bits + 4bit sig */
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static struct msgb *l1_to_rtppayload_fr(uint8_t *l1_payload, uint8_t payload_len)
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{
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struct msgb *msg = msgb_alloc_headroom(1024, 128, "L1C-to-RTP");
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uint8_t *cur;
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/* step1: reverse the bit-order of each payload byte */
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osmo_revbytebits_buf(l1_payload, payload_len);
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cur = msgb_put(msg, GSM_FR_BYTES);
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/* step2: we need to shift the entire L1 payload by 4 bits right */
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osmo_nibble_shift_right(cur, l1_payload, GSM_FR_BITS/4);
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cur[0] |= 0xD0;
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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, uint8_t *rtp_payload,
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unsigned int payload_len)
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{
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/* step2: we need to shift the RTP payload left by one nibble*/
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osmo_nibble_shift_left_unal(l1_payload, rtp_payload, GSM_FR_BITS/4);
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/* step1: reverse the bit-order of each payload byte */
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osmo_revbytebits_buf(l1_payload, payload_len);
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return GSM_FR_BYTES;
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}
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#ifdef GsmL1_TchPlType_Efr
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static struct msgb *l1_to_rtppayload_efr(uint8_t *l1_payload, uint8_t payload_len)
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{
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struct msgb *msg = msgb_alloc_headroom(1024, 128, "L1C-to-RTP");
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uint8_t *cur;
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/* step1: reverse the bit-order of each payload byte */
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osmo_revbytebits_buf(l1_payload, payload_len);
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cur = msgb_put(msg, GSM_EFR_BYTES);
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/* step 2: we need to shift the entire L1 payload by 4 bits right */
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osmo_nibble_shift_right(cur, l1_payload, GSM_EFR_BITS/4);
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cur[0] |= 0xC0;
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return msg;
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}
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#else
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#warning No EFR support in L1
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#endif
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static struct msgb *l1_to_rtppayload_hr(uint8_t *l1_payload, uint8_t payload_len)
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{
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struct msgb *msg = msgb_alloc_headroom(1024, 128, "L1C-to-RTP");
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uint8_t *cur;
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if (payload_len != GSM_HR_BYTES) {
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LOGP(DL1C, 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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/* reverse the bit-order of each payload byte */
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osmo_revbytebits_buf(cur, GSM_HR_BYTES);
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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, 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(DL1C, 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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/* reverse the bit-order of each payload byte */
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osmo_revbytebits_buf(l1_payload, GSM_HR_BYTES);
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return GSM_HR_BYTES;
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}
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#define AMR_TOC_QBIT 0x04
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#define AMR_CMR_NONE 0xF
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static struct msgb *l1_to_rtppayload_amr(uint8_t *l1_payload, uint8_t payload_len,
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struct amr_multirate_conf *amr_mrc)
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{
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struct msgb *msg = msgb_alloc_headroom(1024, 128, "L1C-to-RTP");
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uint8_t *cur;
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u_int8_t cmr;
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uint8_t ft = l1_payload[2] & 0xF;
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uint8_t cmr_idx = l1_payload[1];
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uint8_t amr_if2_len = payload_len - 2;
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#if 0
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/* CMR == Unset means CMR was not transmitted at this TDMA */
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if (cmr_idx >= GsmL1_AmrCodecMode_Unset)
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cmr = AMR_CMR_NONE;
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else if (cmr_idx >= amr_mrc->num_modes) {
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/* Make sure the CMR of the phone is in the active codec set */
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LOGP(DL1C, LOGL_NOTICE, "L1->RTP: overriding CMR IDX %u\n", cmr_idx);
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cmr = AMR_CMR_NONE;
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} else {
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cmr = amr_mrc->mode[cmr_idx].mode;
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}
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#else
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cmr = AMR_CMR_NONE;
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#endif
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/* RFC 3267 4.4.1 Payload Header */
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msgb_put_u8(msg, (cmr << 4));
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/* RFC 3267 AMR TOC */
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msgb_put_u8(msg, AMR_TOC_QBIT | (ft << 3));
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cur = msgb_put(msg, amr_if2_len-1);
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/* step1: reverse the bit-order within every byte */
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osmo_revbytebits_buf(l1_payload+2, amr_if2_len);
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/* step2: shift everything left by one nibble */
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osmo_nibble_shift_left_unal(cur, l1_payload+2, amr_if2_len*2 -1);
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return msg;
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}
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enum amr_frame_type {
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AMR_FT_SID_AMR = 8,
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};
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int get_amr_mode_idx(const struct amr_multirate_conf *amr_mrc, uint8_t cmi)
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{
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unsigned int i;
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for (i = 0; i < amr_mrc->num_modes; i++) {
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if (amr_mrc->mode[i].mode == cmi)
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return i;
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}
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return -EINVAL;
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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, uint8_t *rtp_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 amr_multirate_conf *amr_mrc = &lchan->tch.amr_mr;
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uint8_t ft = (rtp_payload[1] >> 3) & 0xf;
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uint8_t cmr = rtp_payload[0] >> 4;
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uint8_t cmi, sti;
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uint8_t *l1_cmi_idx = l1_payload;
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uint8_t *l1_cmr_idx = l1_payload+1;
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uint8_t amr_if2_core_len = payload_len - 2;
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int rc;
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/* step1: shift everything right one nibble; make space for FT */
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osmo_nibble_shift_right(l1_payload+2, rtp_payload+2, amr_if2_core_len*2);
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/* step2: reverse the bit-order within every byte of the IF2
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* core frame contained in the RTP payload */
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osmo_revbytebits_buf(l1_payload+2, amr_if2_core_len+1);
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/* CMI in downlink tells the L1 encoder which encoding function
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* it will use, so we have to use the frame type */
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switch (ft) {
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case 0: case 1: case 2: case 3:
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case 4: case 5: case 6: case 7:
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cmi = ft;
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LOGP(DRTP, LOGL_DEBUG, "SPEECH frame with CMI %u\n", cmi);
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break;
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case AMR_FT_SID_AMR:
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/* extract the mode indiciation from last bits of
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* 39 bit SID frame (Table 6 / 26.101) */
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cmi = (rtp_payload[2+4] >> 1) & 0x7;
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sti = rtp_payload[2+4] & 0x10;
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LOGP(DRTP, LOGL_DEBUG, "SID %s frame with CMI %u\n",
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sti ? "UPDATE" : "FIRST", cmi);
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break;
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default:
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LOGP(DRTP, LOGL_ERROR, "unsupported AMR FT 0x%02x\n", ft);
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return -EINVAL;
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break;
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}
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rc = get_amr_mode_idx(amr_mrc, cmi);
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if (rc < 0) {
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LOGP(DRTP, LOGL_ERROR, "AMR CMI %u not part of AMR MR set\n",
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cmi);
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*l1_cmi_idx = 0;
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} else
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*l1_cmi_idx = rc;
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/* Codec Mode Request is in upper 4 bits of RTP payload header,
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* and we simply copy the CMR into the CMC */
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if (cmr == 0xF) {
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/* FIXME: we need some state about the last codec mode */
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*l1_cmr_idx = 0;
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} else {
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rc = get_amr_mode_idx(amr_mrc, cmr);
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if (rc < 0) {
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/* FIXME: we need some state about the last codec mode */
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LOGP(DRTP, LOGL_INFO, "RTP->L1: overriding CMR %u\n", cmr);
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*l1_cmr_idx = 0;
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} else
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*l1_cmr_idx = rc;
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}
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#if 0
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/* check for bad quality indication */
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if (rtp_payload[1] & AMR_TOC_QBIT) {
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/* obtain frame type from AMR FT */
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l1_payload[2] = ft;
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} else {
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/* bad quality, we should indicate that... */
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if (ft == AMR_FT_SID_AMR) {
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/* FIXME: Should we do GsmL1_TchPlType_Amr_SidBad? */
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l1_payload[2] = ft;
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} else {
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l1_payload[2] = ft;
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}
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}
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#endif
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/* lower 4 bit of first FR2 byte contains FT */
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l1_payload[2] |= ft;
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if (ft == AMR_FT_SID_AMR) {
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/* store the last SID frame in lchan context */
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unsigned int copy_len;
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copy_len = OSMO_MIN(payload_len+1,
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ARRAY_SIZE(lchan->tch.last_sid.buf));
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lchan->tch.last_sid.len = copy_len;
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memcpy(lchan->tch.last_sid.buf, l1_payload, copy_len);
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}
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return payload_len+1;
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}
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#define RTP_MSGB_ALLOC_SIZE 512
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/*! \brief call-back function for incoming RTP
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* \param rs RTP Socket
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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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*
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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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void bts_model_rtp_rx_cb(struct osmo_rtp_socket *rs, uint8_t *rtp_pl,
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unsigned int rtp_pl_len)
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{
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struct gsm_lchan *lchan = rs->priv;
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struct msgb *msg = l1p_msgb_alloc();
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GsmL1_Prim_t *l1p = msgb_l1prim(msg);
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GsmL1_PhDataReq_t *data_req = &l1p->u.phDataReq;
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GsmL1_MsgUnitParam_t *msu_param = &data_req->msgUnitParam;
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uint8_t *payload_type = &msu_param->u8Buffer[0];
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uint8_t *l1_payload = &msu_param->u8Buffer[1];
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int rc;
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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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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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} 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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}
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break;
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#ifdef GsmL1_TchPlType_Efr
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case GSM48_CMODE_SPEECH_EFR:
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*payload_type = GsmL1_TchPlType_Efr;
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rc = FIXME;
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break;
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#endif
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case GSM48_CMODE_SPEECH_AMR:
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*payload_type = GsmL1_TchPlType_Amr;
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rc = rtppayload_to_l1_amr(l1_payload, rtp_pl,
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rtp_pl_len, lchan);
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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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msgb_free(msg);
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return;
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}
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msu_param->u8Size = rc + 1;
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DEBUGP(DRTP, "%s RTP->L1: %s\n", gsm_lchan_name(lchan),
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osmo_hexdump(msu_param->u8Buffer, msu_param->u8Size));
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/* make sure the number of entries in the dl_tch_queue is never
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* more than 3 */
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{
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struct msgb *tmp;
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int count = 0;
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llist_for_each_entry(tmp, &lchan->dl_tch_queue, list)
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count++;
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DEBUGP(DL1C, "%s DL TCH queue length = %u\n",
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gsm_lchan_name(lchan), count);
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while (count >= 2) {
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tmp = msgb_dequeue(&lchan->dl_tch_queue);
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msgb_free(tmp);
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count--;
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}
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}
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/* enqueue msgb to be transmitted to L1 */
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msgb_enqueue(&lchan->dl_tch_queue, msg);
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}
|
|
|
|
/*! \brief receive a traffic L1 primitive for a given lchan */
|
|
int l1if_tch_rx(struct gsm_lchan *lchan, struct msgb *l1p_msg)
|
|
{
|
|
GsmL1_Prim_t *l1p = msgb_l1prim(l1p_msg);
|
|
GsmL1_PhDataInd_t *data_ind = &l1p->u.phDataInd;
|
|
uint8_t payload_type = data_ind->msgUnitParam.u8Buffer[0];
|
|
uint8_t *payload = data_ind->msgUnitParam.u8Buffer + 1;
|
|
uint8_t payload_len;
|
|
struct msgb *rmsg = NULL;
|
|
|
|
if (data_ind->msgUnitParam.u8Size < 1) {
|
|
LOGP(DL1C, LOGL_ERROR, "%s Rx Payload size 0\n",
|
|
gsm_lchan_name(lchan));
|
|
return -EINVAL;
|
|
}
|
|
payload_len = data_ind->msgUnitParam.u8Size - 1;
|
|
|
|
switch (payload_type) {
|
|
case GsmL1_TchPlType_Fr:
|
|
#ifdef GsmL1_TchPlType_Efr
|
|
case GsmL1_TchPlType_Efr:
|
|
#endif
|
|
if (lchan->type != GSM_LCHAN_TCH_F)
|
|
goto err_payload_match;
|
|
break;
|
|
case GsmL1_TchPlType_Hr:
|
|
if (lchan->type != GSM_LCHAN_TCH_H)
|
|
goto err_payload_match;
|
|
break;
|
|
case GsmL1_TchPlType_Amr:
|
|
if (lchan->type != GSM_LCHAN_TCH_H &&
|
|
lchan->type != GSM_LCHAN_TCH_F)
|
|
goto err_payload_match;
|
|
break;
|
|
default:
|
|
LOGP(DL1C, LOGL_NOTICE, "%s Rx Payload Type %s is unsupported\n",
|
|
gsm_lchan_name(lchan),
|
|
get_value_string(femtobts_tch_pl_names, payload_type));
|
|
break;
|
|
}
|
|
|
|
LOGP(DL1C, LOGL_DEBUG, "%s Rx codec frame (%u): %s\n", gsm_lchan_name(lchan),
|
|
payload_len, osmo_hexdump(payload, payload_len));
|
|
|
|
switch (payload_type) {
|
|
case GsmL1_TchPlType_Fr:
|
|
rmsg = l1_to_rtppayload_fr(payload, payload_len);
|
|
break;
|
|
case GsmL1_TchPlType_Hr:
|
|
rmsg = l1_to_rtppayload_hr(payload, payload_len);
|
|
break;
|
|
#ifdef GsmL1_TchPlType_Efr
|
|
case GsmL1_TchPlType_Efr
|
|
rmsg = l1_to_rtppayload_efr(payload, payload_len);
|
|
break;
|
|
#endif
|
|
case GsmL1_TchPlType_Amr:
|
|
rmsg = l1_to_rtppayload_amr(payload, payload_len,
|
|
&lchan->tch.amr_mr);
|
|
break;
|
|
}
|
|
|
|
if (rmsg) {
|
|
LOGP(DL1C, LOGL_DEBUG, "%s Rx -> RTP: %s\n",
|
|
gsm_lchan_name(lchan), osmo_hexdump(rmsg->data, rmsg->len));
|
|
/* hand rmsg to RTP code for transmission */
|
|
if (lchan->abis_ip.rtp_socket)
|
|
osmo_rtp_send_frame(lchan->abis_ip.rtp_socket,
|
|
rmsg->data, rmsg->len, 160);
|
|
msgb_free(rmsg);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_payload_match:
|
|
LOGP(DL1C, LOGL_ERROR, "%s Rx Payload Type %s incompatible with lchan\n",
|
|
gsm_lchan_name(lchan),
|
|
get_value_string(femtobts_tch_pl_names, payload_type));
|
|
return -EINVAL;
|
|
}
|
|
|
|
struct msgb *gen_empty_tch_msg(struct gsm_lchan *lchan)
|
|
{
|
|
struct msgb *msg = l1p_msgb_alloc();
|
|
GsmL1_Prim_t *l1p = msgb_l1prim(msg);
|
|
GsmL1_PhDataReq_t *data_req = &l1p->u.phDataReq;
|
|
GsmL1_MsgUnitParam_t *msu_param = &data_req->msgUnitParam;
|
|
uint8_t *payload_type = &msu_param->u8Buffer[0];
|
|
uint8_t *l1_payload = &msu_param->u8Buffer[1];
|
|
|
|
switch (lchan->tch_mode) {
|
|
case GSM48_CMODE_SPEECH_AMR:
|
|
*payload_type = GsmL1_TchPlType_Amr;
|
|
if (lchan->tch.last_sid.len) {
|
|
memcpy(l1_payload, lchan->tch.last_sid.buf,
|
|
lchan->tch.last_sid.len);
|
|
msu_param->u8Size = lchan->tch.last_sid.len+1;
|
|
} else {
|
|
/* FIXME: decide if we should send SPEECH_BAD or
|
|
* SID_BAD */
|
|
#if 0
|
|
*payload_type = GsmL1_TchPlType_Amr_SidBad;
|
|
memset(l1_payload, 0xFF, 5);
|
|
msu_param->u8Size = 5 + 3;
|
|
#else
|
|
/* send an all-zero SID */
|
|
msu_param->u8Size = 8;
|
|
#endif
|
|
}
|
|
break;
|
|
default:
|
|
msgb_free(msg);
|
|
msg = NULL;
|
|
break;
|
|
}
|
|
|
|
return msg;
|
|
}
|