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/* OsmoBTS common TCH code */
/* (C) 2011-2012 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <osmo-bts/gsm_data.h>
extern struct msgb *l1p_msgb_alloc(void);
extern uint8_t *get_payload_addr(struct msgb *msg);
extern void set_payload_type(struct msgb *msg, struct gsm_lchan *lchan);
extern void set_payload_size(struct msgb *msg, uint8_t size);
struct msgb *gen_empty_tch_msg(struct gsm_lchan *lchan)
{
struct msgb *msg;
uint8_t *l1_payload;
msg = l1p_msgb_alloc();
if (!msg)
return NULL;
l1_payload = get_payload_addr(msg);
switch (lchan->tch_mode) {
case GSM48_CMODE_SPEECH_AMR:
set_payload_type(msg, lchan);
if (lchan->tch.last_sid.len) {
memcpy(l1_payload, lchan->tch.last_sid.buf,
lchan->tch.last_sid.len);
set_payload_size(msg, 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 */
set_payload_size(msg, 8);
#endif
}
break;
default:
msgb_free(msg);
msg = NULL;
break;
}
return msg;
}
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