| /* Simple TRAU frame reflector to route voice calls */ |
| |
| /* (C) 2009 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 Affero 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/>. |
| * |
| */ |
| |
| /* The "TRAU mux map" defines which particular 16kbit sub-slot (in which E1 |
| * timeslot on which E1 interface) should be directly muxed to which other |
| * sub-slot. Entries in the mux map are always bi-directional. |
| * |
| * The idea of all this is to directly switch voice channels in the BSC |
| * from one phone to another. We do this right now since we don't support |
| * any external interface for voice channels, and in the future as an |
| * optimization to routing them externally. |
| */ |
| |
| #include <stdint.h> |
| #include <osmocom/msc/gsm_data.h> |
| #include <osmocom/msc/mncc.h> |
| |
| struct decoded_trau_frame; |
| |
| /* map a TRAU mux map entry */ |
| int trau_mux_map(const struct gsm_e1_subslot *src, |
| const struct gsm_e1_subslot *dst); |
| int trau_mux_map_lchan(const struct gsm_lchan *src, |
| const struct gsm_lchan *dst); |
| |
| /* unmap a TRAU mux map entry */ |
| int trau_mux_unmap(const struct gsm_e1_subslot *ss, uint32_t callref); |
| |
| /* we get called by subchan_demux */ |
| int trau_mux_input(struct gsm_e1_subslot *src_e1_ss, |
| const uint8_t *trau_bits, int num_bits); |
| |
| /* add a trau receiver */ |
| int trau_recv_lchan(struct gsm_lchan *lchan, uint32_t callref); |
| |
| /* send trau from application */ |
| int trau_send_frame(struct gsm_lchan *lchan, struct gsm_data_frame *frame); |
| |
| /* switch trau muxer to new lchan */ |
| int switch_trau_mux(struct gsm_lchan *old_lchan, struct gsm_lchan *new_lchan); |
| |
| /* callback invoked if we receive TRAU frames */ |
| int subch_cb(struct subch_demux *dmx, int ch, uint8_t *data, int len, void *_priv); |
| |
| /* TRAU frame transcoding */ |
| struct msgb *trau_decode_fr(uint32_t callref, |
| const struct decoded_trau_frame *tf); |
| struct msgb *trau_decode_efr(uint32_t callref, |
| const struct decoded_trau_frame *tf); |
| void trau_encode_fr(struct decoded_trau_frame *tf, |
| const unsigned char *data); |
| void trau_encode_efr(struct decoded_trau_frame *tf, |
| const unsigned char *data); |