Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 1 | /* New (2020) TRAU frame handling according to GSM TS 48.060 + 48.061 */ |
| 2 | |
| 3 | /* (C) 2020 by Harald Welte <laforge@gnumonks.org> |
| 4 | * All Rights Reserved |
| 5 | * |
| 6 | * SPDX-License-Identifier: AGPL-3.0+ |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU Affero General Public License as published by |
| 10 | * the Free Software Foundation; either version 3 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU Affero General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Affero General Public License |
| 19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 20 | * |
| 21 | */ |
| 22 | #include "internal.h" |
| 23 | |
| 24 | #include <unistd.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <stdio.h> |
| 27 | #include <string.h> |
| 28 | #include <errno.h> |
| 29 | |
| 30 | #include <osmocom/trau/trau_frame.h> |
| 31 | #include <osmocom/core/logging.h> |
| 32 | |
| 33 | /*! \addtogroup trau_frame |
| 34 | * @{ |
| 35 | * |
| 36 | * \file trau_frame.c |
| 37 | */ |
| 38 | |
| 39 | static uint32_t get_bits(const ubit_t *bitbuf, int offset, int num) |
| 40 | { |
| 41 | int i; |
| 42 | uint32_t ret = 0; |
| 43 | |
| 44 | for (i = offset; i < offset + num; i++) { |
| 45 | ret = ret << 1; |
| 46 | if (bitbuf[i]) |
| 47 | ret |= 1; |
| 48 | } |
| 49 | return ret; |
| 50 | } |
| 51 | |
| 52 | const struct value_string osmo_trau_frame_type_names[] = { |
| 53 | { OSMO_TRAU_FT_NONE, "NONE" }, |
| 54 | { OSMO_TRAU16_FT_FR, "FR" }, |
| 55 | { OSMO_TRAU16_FT_HR, "HR" }, |
| 56 | { OSMO_TRAU16_FT_EFR, "EFR" }, |
| 57 | { OSMO_TRAU16_FT_AMR, "AMR" }, |
| 58 | { OSMO_TRAU16_FT_OAM, "OAM" }, |
| 59 | { OSMO_TRAU16_FT_DATA, "DATA" }, |
| 60 | { OSMO_TRAU16_FT_EDATA, "EDATA" }, |
| 61 | { OSMO_TRAU16_FT_D145_SYNC, "D145_SYNC" }, |
| 62 | { OSMO_TRAU16_FT_DATA_HR, "DATA_HR" }, |
| 63 | { OSMO_TRAU16_FT_IDLE, "IDLE" }, |
| 64 | { OSMO_TRAU8_SPEECH, "8SPEECH" }, |
| 65 | { OSMO_TRAU8_DATA, "8DATA" }, |
| 66 | { OSMO_TRAU8_OAM, "8OAM" }, |
| 67 | { OSMO_TRAU8_AMR_LOW, "8AMR_LOW" }, |
| 68 | { OSMO_TRAU8_AMR_6k7, "8AMR_6k7" }, |
| 69 | { OSMO_TRAU8_AMR_7k4, "8AMR_7k4" }, |
| 70 | { 0, NULL } |
| 71 | }; |
| 72 | |
| 73 | /********************************************************************************* |
| 74 | * New API; introduced in 2020 for use by osmo-mgw |
| 75 | *********************************************************************************/ |
| 76 | |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 77 | /* Bits C21..C22 (16k) or C4..C5 (8k) */ |
| 78 | enum ts48060_amr_frame_classification { |
| 79 | TS48060_AMR_FC_SPEECH_GOOD = 0x3, |
| 80 | TS48060_AMR_FC_SPEECH_DEGRADED = 0x2, |
| 81 | TS48060_AMR_FC_SPEECH_BAD = 0x1, |
| 82 | TS48060_AMR_FC_NO_SPEECH = 0x0, |
| 83 | }; |
| 84 | |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 85 | /* 16k sub-slots */ |
| 86 | static const ubit_t ft_fr_up_bits[5] = { 0, 0, 0, 1, 0 }; |
| 87 | static const ubit_t ft_fr_down_bits[5] = { 1, 1, 1, 0, 0 }; |
| 88 | static const ubit_t ft_data_up_bits[5] = { 0, 1, 0, 0, 0 }; |
| 89 | static const ubit_t ft_data_down_bits[5] = { 1, 0, 1, 1, 0 }; |
| 90 | static const ubit_t ft_idle_up_bits[5] = { 1, 0, 0, 0, 0 }; |
| 91 | static const ubit_t ft_idle_down_bits[5] = { 0, 1, 1, 1, 0 }; |
| 92 | static const ubit_t ft_efr_bits[5] = { 1, 1, 0, 1, 0 }; |
| 93 | static const ubit_t ft_amr_bits[5] = { 0, 0, 1, 1, 0 }; |
| 94 | static const ubit_t ft_oam_up_bits[5] = { 0, 0, 1, 0, 1 }; |
| 95 | static const ubit_t ft_oam_down_bits[5] = { 1, 1, 0, 1, 1 }; |
| 96 | static const ubit_t ft_d145s_bits[5] = { 1, 0, 1, 0, 0 }; |
| 97 | static const ubit_t ft_edata_bits[5] = { 1, 1, 1, 1, 1 }; |
| 98 | |
| 99 | /* 8k sub-slots */ |
| 100 | static const ubit_t ft_hr_up_bits[5] = { 0, 0, 0, 1, 1 }; |
| 101 | static const ubit_t ft_hr_down_bits[5] = { 1, 1, 1, 0, 1 }; |
| 102 | static const ubit_t ft_data_hr_up_bits[5] = { 0, 1, 0, 0, 1 }; |
| 103 | static const ubit_t ft_data_hr_down_bits[5] = { 1, 0, 1, 1, 1 }; |
| 104 | |
| 105 | |
| 106 | /* generate the sync pattern described in TS 08.60 4.8.1 */ |
| 107 | static void encode_sync16(ubit_t *trau_bits) |
| 108 | { |
| 109 | int i; |
| 110 | |
| 111 | /* 16 '0' bits in header */ |
| 112 | memset(trau_bits, 0, 16); |
| 113 | /* '1'-bit in regular intervals */ |
| 114 | for (i = 16; i < 40*8; i += 16) |
| 115 | trau_bits[i] = 1; |
| 116 | } |
| 117 | |
| 118 | #define T16_500us 8 /* 500 us = 8 bits */ |
| 119 | #define T16_250us 4 /* 250 us = 4 bits */ |
| 120 | |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 121 | #define T8_250us 2 /* 250 us = 2 bits */ |
| 122 | #define T8_125us 1 /* 125 us = 1 bits */ |
| 123 | |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 124 | /* How many 16k bits to delay / advance (TS 48.060 Section 5.5.1.1.1) */ |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 125 | static int trau_frame_16_ta_us(uint8_t c6_11) |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 126 | { |
| 127 | if (c6_11 <= 0x27) |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 128 | return c6_11 * 500; /* delay frame N x 500us */ |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 129 | else if (c6_11 == 0x3e) |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 130 | return 250; /* delay frame 250us */ |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 131 | else if (c6_11 == 0x3f) |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 132 | return -250; /* advance frame 250us */ |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 133 | else |
| 134 | return 0; |
| 135 | } |
| 136 | |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 137 | /* How many 8k bits to delay / advance (TS 48.061 Table 6.1) */ |
| 138 | static int trau_frame_8_ta_us(uint8_t c6_8) |
| 139 | { |
| 140 | /* TA2..TA1..TA0 == C6..C7..C8 */ |
| 141 | switch (c6_8) { |
| 142 | case 0x7: |
| 143 | return 0; |
| 144 | case 0x6: |
| 145 | return -250; |
| 146 | case 0x5: |
| 147 | return 250; |
| 148 | case 0x3: |
| 149 | return 500; |
| 150 | case 0x4: |
| 151 | return 1000; |
| 152 | case 0x2: |
| 153 | return 2000; |
| 154 | case 0x1: |
| 155 | return 6000; |
| 156 | case 0: |
| 157 | return 9000; |
| 158 | default: |
| 159 | return 0; |
| 160 | } |
| 161 | } |
| 162 | |
| 163 | /*! Determine the time alignment in us requested by CCU in a UL frame */ |
| 164 | int osmo_trau_frame_dl_ta_us(const struct osmo_trau_frame *fr) |
| 165 | { |
| 166 | uint8_t c6_11, c6_8, fc; |
| 167 | |
| 168 | /* timing alignment is only communicated from CCU to TRAU in UL */ |
| 169 | if (fr->dir == OSMO_TRAU_DIR_DL) |
| 170 | return 0; |
| 171 | |
| 172 | switch (fr->type) { |
| 173 | case OSMO_TRAU16_FT_FR: |
| 174 | case OSMO_TRAU16_FT_EFR: |
| 175 | case OSMO_TRAU16_FT_HR: |
| 176 | case OSMO_TRAU16_FT_AMR: |
| 177 | c6_11 = (fr->c_bits[5] << 5) | (fr->c_bits[6] << 4) | (fr->c_bits[7] << 3) | |
| 178 | (fr->c_bits[8] << 2) | (fr->c_bits[9] << 1) | (fr->c_bits[10] << 0); |
| 179 | return trau_frame_16_ta_us(c6_11); |
| 180 | break; |
| 181 | |
| 182 | case OSMO_TRAU8_SPEECH: |
| 183 | c6_8 = (fr->c_bits[5] << 2) | (fr->c_bits[6] << 1) | (fr->c_bits[7] << 0); |
| 184 | return trau_frame_8_ta_us(c6_8); |
| 185 | break; |
| 186 | |
| 187 | case OSMO_TRAU8_AMR_LOW: |
| 188 | fc = (fr->c_bits[3] << 1) | (fr->c_bits[4] << 0); |
| 189 | if (fc == TS48060_AMR_FC_NO_SPEECH) { |
| 190 | c6_11 = (fr->c_bits[5] << 5) | (fr->c_bits[6] << 4) | (fr->c_bits[7] << 3) | |
| 191 | (fr->c_bits[8] << 2) | (fr->c_bits[9] << 1) | (fr->c_bits[10] << 0); |
| 192 | /* For AMR speech on 8 kBit/s submultiplexing the same procedures as for AMR |
| 193 | * speech on 16 kBit/s submultiplexing shall be applied, see 3GPP TS 48.060 */ |
| 194 | return trau_frame_16_ta_us(c6_11); |
| 195 | } else |
| 196 | return 0; |
| 197 | break; |
| 198 | |
| 199 | default: |
| 200 | return 0; |
| 201 | } |
| 202 | } |
| 203 | |
| 204 | static int encode16_handle_ta(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 205 | { |
| 206 | if (fr->dir == OSMO_TRAU_DIR_DL) { |
| 207 | int num_bits = fr->dl_ta_usec * T16_250us / 250; |
| 208 | if (num_bits > 0) { |
| 209 | if (num_bits > 39 * 8) |
| 210 | num_bits = 39; |
| 211 | memset(trau_bits + 40 * 8, 1, num_bits); |
| 212 | return 40 * 8 + num_bits; |
| 213 | } else if (num_bits < 0) { |
| 214 | if (num_bits < -1 * T16_250us) |
| 215 | num_bits = -1 * T16_250us; |
| 216 | return 40 * 8 + num_bits; |
| 217 | } |
| 218 | } |
| 219 | return 40 * 8; |
| 220 | } |
| 221 | |
| 222 | static int encode8_handle_ta(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 223 | { |
| 224 | if (fr->dir == OSMO_TRAU_DIR_DL) { |
| 225 | int num_bits = fr->dl_ta_usec * T8_250us / 250; |
| 226 | if (num_bits > 0) { |
| 227 | if (num_bits > 20 * 8 - 2) |
| 228 | num_bits = 20 * 8 - 2; |
| 229 | memset(trau_bits + 20 * 8, 1, num_bits); |
| 230 | return 20 * 8 + num_bits; |
| 231 | } else if (num_bits < 0) { |
| 232 | if (num_bits < -1 * T8_250us) |
| 233 | num_bits = -2; |
| 234 | return 20 * 8 + num_bits; |
| 235 | } |
| 236 | } |
| 237 | return 20 * 8; |
| 238 | } |
| 239 | |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 240 | /* TS 08.60 Section 3.1.1 */ |
| 241 | static int encode16_fr(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 242 | { |
| 243 | const ubit_t *cbits5; |
| 244 | int i; |
| 245 | int d_idx = 0; |
| 246 | |
| 247 | switch (fr->type) { |
| 248 | case OSMO_TRAU16_FT_IDLE: |
| 249 | if (fr->dir == OSMO_TRAU_DIR_UL) |
| 250 | cbits5 = ft_idle_up_bits; |
| 251 | else |
| 252 | cbits5 = ft_idle_down_bits; |
| 253 | break; |
| 254 | case OSMO_TRAU16_FT_FR: |
| 255 | if (fr->dir == OSMO_TRAU_DIR_UL) |
| 256 | cbits5 = ft_fr_up_bits; |
| 257 | else |
| 258 | cbits5 = ft_fr_down_bits; |
| 259 | break; |
| 260 | case OSMO_TRAU16_FT_EFR: |
| 261 | cbits5 = ft_efr_bits; |
| 262 | break; |
| 263 | default: |
| 264 | return -EINVAL; |
| 265 | } |
| 266 | |
| 267 | encode_sync16(trau_bits); |
| 268 | |
| 269 | /* C1 .. C5 */ |
| 270 | memcpy(trau_bits + 17, cbits5 + 0, 5); |
| 271 | /* C6 .. C15 */ |
| 272 | memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 15 - 5); |
| 273 | /* D1 .. D255 */ |
| 274 | for (i = 32; i < 304; i += 16) { |
| 275 | trau_bits[i] = 1; |
| 276 | memcpy(trau_bits + i + 1, fr->d_bits + d_idx, 15); |
| 277 | d_idx += 15; |
| 278 | } |
| 279 | /* D256 .. D260 */ |
| 280 | trau_bits[304] = 1; |
| 281 | memcpy(trau_bits + 305, fr->d_bits + d_idx, 5); |
| 282 | /* C16 .. C21 */ |
| 283 | memcpy(trau_bits + 310, fr->c_bits + 15, 6); |
| 284 | |
| 285 | /* T1 .. T4 */ |
| 286 | memcpy(trau_bits + 316, fr->t_bits+0, 4); |
| 287 | |
| 288 | /* handle timing adjustment */ |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 289 | return encode16_handle_ta(trau_bits, fr); |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | /* TS 08.60 Section 3.1.1 */ |
| 293 | static int decode16_fr(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 294 | enum osmo_trau_frame_direction dir) |
| 295 | { |
| 296 | int i; |
| 297 | int d_idx = 0; |
| 298 | |
| 299 | /* C1 .. C15 */ |
| 300 | memcpy(fr->c_bits + 0, trau_bits + 17, 15); |
| 301 | /* C16 .. C21 */ |
| 302 | memcpy(fr->c_bits + 15, trau_bits + 310, 6); |
| 303 | /* T1 .. T4 */ |
| 304 | memcpy(fr->t_bits + 0, trau_bits + 316, 4); |
| 305 | /* D1 .. D255 */ |
| 306 | for (i = 32; i < 304; i+= 16) { |
| 307 | memcpy(fr->d_bits + d_idx, trau_bits + i + 1, 15); |
| 308 | d_idx += 15; |
| 309 | } |
| 310 | /* D256 .. D260 */ |
| 311 | memcpy(fr->d_bits + d_idx, trau_bits + 305, 5); |
| 312 | |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | /* TS 08.60 Section 3.1.2 */ |
| 317 | static int encode16_amr(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 318 | { |
| 319 | const ubit_t *cbits5 = ft_amr_bits; |
| 320 | int i, d_idx; |
| 321 | |
| 322 | encode_sync16(trau_bits); |
| 323 | |
| 324 | /* C1 .. C5 */ |
| 325 | memcpy(trau_bits + 17, cbits5 + 0, 5); |
| 326 | /* C6 .. C15 */ |
| 327 | memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 15 - 5); |
| 328 | |
| 329 | trau_bits[32] = 1; |
| 330 | /* C16 .. C25 */ |
| 331 | memcpy(trau_bits + 33, fr->c_bits + 15, 10); |
| 332 | /* D1 .. D5 */ |
| 333 | memcpy(trau_bits + 43, fr->d_bits + 0, 5); |
| 334 | |
| 335 | /* D6 .. D256 */ |
| 336 | for (i = 48, d_idx = 5; i <= 315; i += 16, d_idx += 15) { |
| 337 | trau_bits[i] = 1; |
| 338 | memcpy(trau_bits + i + 1, fr->d_bits + d_idx, 15); |
| 339 | } |
| 340 | |
| 341 | /* T1 .. T4 */ |
| 342 | memcpy(trau_bits + 316, fr->t_bits + 0, 4); |
| 343 | |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 344 | return encode16_handle_ta(trau_bits, fr); |
| 345 | |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 346 | /* FIXME: handle TAE (Timing Alignment Extension) */ |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 347 | } |
| 348 | |
| 349 | /* TS 08.60 Section 3.1.2 */ |
| 350 | static int decode16_amr(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 351 | enum osmo_trau_frame_direction dir) |
| 352 | { |
| 353 | int i; |
| 354 | int d_idx = 0; |
| 355 | |
| 356 | /* C1 .. C15 */ |
| 357 | memcpy(fr->c_bits + 0, trau_bits + 17, 15); |
| 358 | /* C16 .. C25 */ |
| 359 | memcpy(fr->c_bits + 15, trau_bits + 33, 10); |
| 360 | /* T1 .. T4 */ |
| 361 | memcpy(fr->t_bits + 0, trau_bits + 316, 4); |
| 362 | /* D1 .. D5 */ |
| 363 | memcpy(fr->d_bits, trau_bits + 43, 5); |
| 364 | d_idx += 5; |
| 365 | /* D6 .. D245 */ |
| 366 | for (i = 48; i < 304; i += 16) { |
| 367 | memcpy(fr->d_bits + d_idx, trau_bits + i + 1, 15); |
| 368 | d_idx += 15; |
| 369 | } |
| 370 | /* D246 .. D256 */ |
| 371 | memcpy(fr->d_bits + d_idx, trau_bits + 305, 11); |
| 372 | |
| 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | /* TS 08.60 Section 3.2 */ |
| 377 | static int encode16_oam(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 378 | { |
| 379 | const ubit_t *cbits5; |
| 380 | int i, d_idx; |
| 381 | |
| 382 | if (fr->dir == OSMO_TRAU_DIR_UL) |
| 383 | cbits5 = ft_oam_up_bits; |
| 384 | else |
| 385 | cbits5 = ft_oam_down_bits; |
| 386 | |
| 387 | encode_sync16(trau_bits); |
| 388 | |
| 389 | /* C1 .. C5 */ |
| 390 | memcpy(trau_bits + 17, cbits5, 5); |
| 391 | /* C6 .. C15 */ |
| 392 | memcpy(trau_bits + 17 + 5, fr->c_bits, 15 - 5); |
| 393 | |
| 394 | /* D1 .. D255 */ |
| 395 | for (i = 32, d_idx = 0; i < 304; i += 16, d_idx += 15) { |
| 396 | trau_bits[i] = 1; |
| 397 | memcpy(trau_bits + i + 1, fr->d_bits + d_idx, 15); |
| 398 | } |
| 399 | /* D256 .. D264 */ |
| 400 | memcpy(trau_bits + 305, fr->d_bits + 256, 9); |
| 401 | |
| 402 | /* S1 .. S6 */ |
| 403 | memcpy(trau_bits + 314, fr->s_bits, 6); |
| 404 | |
| 405 | return 40 * 8; |
| 406 | } |
| 407 | |
| 408 | /* TS 08.60 Section 3.2 */ |
| 409 | static int decode16_oam(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 410 | enum osmo_trau_frame_direction dir) |
| 411 | { |
| 412 | int i, d_idx; |
| 413 | |
| 414 | /* C1 .. C15 */ |
| 415 | memcpy(fr->c_bits + 0, trau_bits + 17, 15); |
| 416 | |
| 417 | /* D1 .. D255 */ |
| 418 | for (i = 33, d_idx = 0; i < 312; i+= 16, d_idx += 15) |
| 419 | memcpy(fr->d_bits + d_idx, trau_bits + i + 1, 15); |
| 420 | /* D256 .. D264 */ |
| 421 | memcpy(fr->d_bits+d_idx, trau_bits + 305, 9); |
| 422 | |
| 423 | /* S1 .. S6 */ |
| 424 | memcpy(fr->s_bits, trau_bits + 314, 6); |
| 425 | |
| 426 | return 0; |
| 427 | } |
| 428 | |
| 429 | /* TS 08.61 Section 5.1.1.1 */ |
| 430 | static int encode16_hr(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 431 | { |
| 432 | int d_idx = 0; |
| 433 | const ubit_t *cbits5; |
| 434 | |
| 435 | if (fr->dir == OSMO_TRAU_DIR_UL) |
| 436 | cbits5 = ft_hr_up_bits; |
| 437 | else |
| 438 | cbits5 = ft_hr_down_bits; |
| 439 | |
| 440 | encode_sync16(trau_bits); |
| 441 | |
| 442 | /* C1 .. C5 */ |
| 443 | memcpy(trau_bits + 17, cbits5, 5); |
| 444 | /* C6 .. C15 */ |
| 445 | memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 10); |
| 446 | |
| 447 | /* UFI */ |
| 448 | trau_bits[33] = fr->ufi; |
| 449 | |
| 450 | /* D1 .. D14 */ |
| 451 | memcpy(trau_bits + 4 * 8 + 2, fr->d_bits+d_idx, 14); d_idx += 14; |
| 452 | /* D15 .. D29 */ |
| 453 | memcpy(trau_bits + 6 * 8 + 1, fr->d_bits+d_idx, 15); d_idx += 15; |
| 454 | /* D30 .. D44 */ |
| 455 | memcpy(trau_bits + 8 * 8 + 1, fr->d_bits+d_idx, 15); d_idx += 15; |
| 456 | /* CRC */ |
| 457 | memcpy(trau_bits + 10 * 8 + 1, fr->crc_bits, 3); |
| 458 | /* D45 .. D56 */ |
| 459 | memcpy(trau_bits + 10 * 8 + 4, fr->d_bits+d_idx, 12); d_idx += 12; |
| 460 | /* D57 .. D71 */ |
| 461 | memcpy(trau_bits + 12 * 8 + 1, fr->d_bits+d_idx, 15); d_idx += 15; |
| 462 | /* D72 .. D86 */ |
| 463 | memcpy(trau_bits + 14 * 8 + 1, fr->d_bits+d_idx, 15); d_idx += 15; |
| 464 | /* D87 .. D101 */ |
| 465 | memcpy(trau_bits + 16 * 8 + 1, fr->d_bits+d_idx, 15); d_idx += 15; |
| 466 | /* D102 .. D112 */ |
| 467 | memcpy(trau_bits + 18 * 8 + 1, fr->d_bits+d_idx, 11); d_idx += 11; |
| 468 | |
| 469 | memset(trau_bits + 19 * 8 + 4, 0x01, 4 + 18 * 8 + 6); |
| 470 | /* C16 .. C21 */ |
| 471 | memcpy(trau_bits + 38 * 8 + 6, fr->c_bits + 15, 6); |
| 472 | |
| 473 | /* T1 .. T4 */ |
| 474 | memcpy(trau_bits + 39 * 8 + 4, fr->t_bits, 4); |
| 475 | |
| 476 | /* handle timing adjustment */ |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 477 | return encode16_handle_ta(trau_bits, fr); |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 478 | } |
| 479 | |
| 480 | /* TS 08.61 Section 5.1.1.1 */ |
| 481 | static int decode16_hr(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 482 | enum osmo_trau_frame_direction dir) |
| 483 | { |
| 484 | int d_idx = 0; |
| 485 | |
| 486 | /* C1 .. C15 */ |
| 487 | memcpy(fr->c_bits + 0, trau_bits + 17, 15); |
| 488 | /* C16 .. C21 */ |
| 489 | memcpy(fr->c_bits + 15, trau_bits + 38 * 8 + 6, 6); |
| 490 | /* T1 .. T4 */ |
| 491 | memcpy(fr->t_bits + 0, trau_bits + 39 * 8 + 4, 4); |
| 492 | |
| 493 | /* UFI */ |
| 494 | fr->ufi = trau_bits[33]; |
| 495 | /* D1 .. D14 */ |
| 496 | memcpy(fr->d_bits + d_idx, trau_bits + 4 * 8 + 2, 14); d_idx += 14; |
| 497 | /* D15 .. D29 */ |
| 498 | memcpy(fr->d_bits + d_idx, trau_bits + 6 * 8 + 1, 15); d_idx += 15; |
| 499 | /* D30 .. D44 */ |
| 500 | memcpy(fr->d_bits + d_idx, trau_bits + 8 * 8 + 1, 15); d_idx += 15; |
| 501 | /* CRC0..2 */ |
| 502 | memcpy(fr->crc_bits, trau_bits + 10 * 8 + 1, 3); |
| 503 | /* D45 .. D56 */ |
| 504 | memcpy(fr->d_bits + d_idx, trau_bits + 10 * 8 + 4, 12); d_idx += 12; |
| 505 | /* D57 .. D71 */ |
| 506 | memcpy(fr->d_bits + d_idx, trau_bits + 12 * 8 + 1, 15); d_idx += 15; |
| 507 | /* D72 .. D86 */ |
| 508 | memcpy(fr->d_bits + d_idx, trau_bits + 14 * 8 + 1, 15); d_idx += 15; |
| 509 | /* D87 .. D101 */ |
| 510 | memcpy(fr->d_bits + d_idx, trau_bits + 16 * 8 + 1, 15); d_idx += 15; |
| 511 | /* D102 .. D112 */ |
| 512 | memcpy(fr->d_bits + d_idx, trau_bits + 18 * 8 + 1, 11); d_idx += 11; |
| 513 | |
| 514 | return 0; |
| 515 | } |
| 516 | |
| 517 | static struct osmo_trau_frame fr_idle_frame = { |
| 518 | .type = OSMO_TRAU16_FT_IDLE, |
| 519 | .dir = OSMO_TRAU_DIR_DL, |
| 520 | .t_bits = { 1, 1, 1, 1 }, |
| 521 | }; |
| 522 | #define TRAU_FRAME_BITS (40*8) |
| 523 | static ubit_t encoded_idle_frame[TRAU_FRAME_BITS]; |
| 524 | static int dbits_initted = 0; |
| 525 | |
| 526 | /*! \brief return pointer to global buffer containing a TRAU idle frame */ |
| 527 | static ubit_t *trau_idle_frame(void) |
| 528 | { |
| 529 | /* only initialize during the first call */ |
| 530 | if (!dbits_initted) { |
| 531 | /* set all D-bits to 1 */ |
| 532 | memset(&fr_idle_frame.d_bits, 0x01, 260); |
| 533 | |
| 534 | memset(&fr_idle_frame.c_bits, 0x01, 25); /* spare are set to 1 */ |
| 535 | /* set Downlink Idle Speech Frame pattern */ |
| 536 | fr_idle_frame.c_bits[0] = 0; /* C1 */ |
| 537 | fr_idle_frame.c_bits[1] = 1; /* C2 */ |
| 538 | fr_idle_frame.c_bits[2] = 1; /* C3 */ |
| 539 | fr_idle_frame.c_bits[3] = 1; /* C4 */ |
| 540 | fr_idle_frame.c_bits[4] = 0; /* C5 */ |
| 541 | /* set no Time Alignment pattern */ |
| 542 | fr_idle_frame.c_bits[5] = 0; /* C6 */ |
| 543 | fr_idle_frame.c_bits[6] = 0; /* C7 */ |
| 544 | fr_idle_frame.c_bits[7] = 0; /* C8 */ |
| 545 | fr_idle_frame.c_bits[8] = 0; /* C9 */ |
| 546 | fr_idle_frame.c_bits[9] = 0; /* C10 */ |
| 547 | fr_idle_frame.c_bits[10] = 0; /* C11 */ |
| 548 | /* already set to 1, but maybe we need to modify it in the future */ |
| 549 | fr_idle_frame.c_bits[11] = 1; /* C12 (UFE), good frame */ |
| 550 | fr_idle_frame.c_bits[15] = 1; /* C16 (SP), no DTX */ |
| 551 | |
| 552 | encode16_fr(encoded_idle_frame, &fr_idle_frame); |
| 553 | dbits_initted = 1; /* set it to 1 to not call it again */ |
| 554 | } |
| 555 | return encoded_idle_frame; |
| 556 | } |
| 557 | |
| 558 | /* TS 08.60 Section 3.4 */ |
| 559 | static int encode16_idle(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 560 | { |
| 561 | memcpy(trau_bits, trau_idle_frame(), 40*8); |
| 562 | return 40 * 8; |
| 563 | } |
| 564 | |
| 565 | /* TS 08.60 Section 3.3.1 */ |
| 566 | static int decode16_data(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 567 | enum osmo_trau_frame_direction dir) |
| 568 | { |
| 569 | int i, d_idx = 0; |
| 570 | |
| 571 | /* C1 .. C15 */ |
| 572 | memcpy(fr->c_bits + 0, trau_bits + 17, 15); |
| 573 | |
| 574 | /* D1 .. D63 */ |
| 575 | for (i = 0; i < 9; i++) { |
| 576 | memcpy(fr->d_bits + d_idx, trau_bits + (4 + i) * 8 + 1, 7); |
| 577 | d_idx += 7; |
| 578 | } |
| 579 | /* D64 .. D126 */ |
| 580 | for (i = 0; i < 9; i++) { |
| 581 | memcpy(fr->d_bits + d_idx, trau_bits + (13 + i) * 8 + 1, 7); |
| 582 | d_idx += 7; |
| 583 | } |
| 584 | |
| 585 | /* D127 .. D189 */ |
| 586 | for (i = 0; i < 9; i++) { |
| 587 | memcpy(fr->d_bits + d_idx, trau_bits + (22 + i) * 8 + 1, 7); |
| 588 | d_idx += 7; |
| 589 | } |
| 590 | |
| 591 | /* D190 .. D252 */ |
| 592 | for (i = 0; i < 9; i++) { |
| 593 | memcpy(fr->d_bits + d_idx, trau_bits + (31 + i) * 8 + 1, 7); |
| 594 | d_idx += 7; |
| 595 | } |
| 596 | |
| 597 | return 0; |
| 598 | } |
| 599 | |
| 600 | /* TS 08.60 Section 3.3.1 */ |
| 601 | static int encode16_data(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 602 | { |
| 603 | const ubit_t *cbits5; |
| 604 | int i, d_idx = 0; |
| 605 | |
| 606 | if (fr->dir == OSMO_TRAU_DIR_UL) |
| 607 | cbits5 = ft_data_up_bits; |
| 608 | else |
| 609 | cbits5 = ft_data_down_bits; |
| 610 | |
| 611 | encode_sync16(trau_bits); |
| 612 | |
| 613 | /* C1 .. C5 */ |
| 614 | memcpy(trau_bits + 17, cbits5, 5); |
| 615 | /* C6 .. C15 */ |
| 616 | memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 15 - 5); |
| 617 | |
| 618 | /* D1 .. D63 */ |
| 619 | for (i = 0; i < 9; i++) { |
| 620 | unsigned int offset = (4 + i) * 8; |
| 621 | trau_bits[offset] = 1; |
| 622 | memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7); |
| 623 | d_idx += 7; |
| 624 | } |
| 625 | |
| 626 | /* D64 .. D126 */ |
| 627 | for (i = 0; i < 9; i++) { |
| 628 | unsigned int offset = (13 + i) * 8; |
| 629 | trau_bits[offset] = 1; |
| 630 | memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7); |
| 631 | d_idx += 7; |
| 632 | } |
| 633 | |
| 634 | /* D127 .. D189 */ |
| 635 | for (i = 0; i < 9; i++) { |
| 636 | unsigned int offset = (22 + i) * 8; |
| 637 | trau_bits[offset] = 1; |
| 638 | memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7); |
| 639 | d_idx += 7; |
| 640 | } |
| 641 | |
| 642 | /* D190 .. D252 */ |
| 643 | for (i = 0; i < 9; i++) { |
| 644 | unsigned int offset = (31 + i) * 8; |
| 645 | trau_bits[offset] = 1; |
| 646 | memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7); |
| 647 | d_idx += 7; |
| 648 | } |
| 649 | |
| 650 | return 40 * 8; |
| 651 | } |
| 652 | |
| 653 | /* TS 08.60 3.3.2 */ |
| 654 | static int decode16_edata(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 655 | enum osmo_trau_frame_direction dir) |
| 656 | { |
| 657 | /* C1 .. C13 */ |
| 658 | memcpy(fr->c_bits, trau_bits + 17, 13); |
| 659 | |
| 660 | /* M1 .. M2 */ |
| 661 | memcpy(fr->m_bits, trau_bits + 30, 2); |
| 662 | |
| 663 | /* D1 .. D288 */ |
| 664 | memcpy(fr->d_bits, trau_bits + 4 * 8, 288); |
| 665 | |
| 666 | return 0; |
| 667 | } |
| 668 | |
| 669 | /* TS 08.60 Section 3.3.2 */ |
| 670 | static int encode16_edata(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 671 | { |
| 672 | const ubit_t *cbits5; |
| 673 | |
| 674 | if (fr->type == OSMO_TRAU16_FT_D145_SYNC) |
| 675 | cbits5 = ft_d145s_bits; |
| 676 | else |
| 677 | cbits5 = ft_edata_bits; |
| 678 | |
| 679 | /* C1 .. C5 */ |
| 680 | memcpy(trau_bits + 17, cbits5, 5); |
| 681 | |
| 682 | /* C6 .. C13 */ |
| 683 | memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 8); |
| 684 | |
| 685 | /* M1 .. M2 */ |
| 686 | memcpy(trau_bits + 30, fr->m_bits, 2); |
| 687 | |
| 688 | /* D1 .. D288 */ |
| 689 | memcpy(trau_bits + 4 * 8, fr->d_bits, 288); |
| 690 | |
| 691 | return 40 * 8; |
| 692 | } |
| 693 | |
| 694 | /* TS 08.61 Section 5.1.2 */ |
| 695 | static int decode16_data_hr(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 696 | enum osmo_trau_frame_direction dir) |
| 697 | { |
| 698 | int i, d_idx = 0; |
| 699 | |
| 700 | /* C1 .. C15 */ |
| 701 | memcpy(fr->c_bits+0, trau_bits + 17, 15); |
| 702 | |
| 703 | /* D1 .. D63 */ |
| 704 | for (i = 0; i < 9; i++) { |
| 705 | memcpy(fr->d_bits + d_idx, trau_bits + (4 + i) * 8 + 1, 7); |
| 706 | d_idx += 7; |
| 707 | } |
| 708 | |
| 709 | /* D'1 .. D'63 (mapped to D64..D127) */ |
| 710 | for (i = 0; i < 9; i++) { |
| 711 | memcpy(fr->d_bits + d_idx, trau_bits + (22 + i) * 8 + 1, 7); |
| 712 | d_idx += 7; |
| 713 | } |
| 714 | |
| 715 | return 0; |
| 716 | } |
| 717 | |
| 718 | /* TS 08.61 Section 5.1.2 */ |
| 719 | static int encode16_data_hr(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 720 | { |
| 721 | const ubit_t *cbits5; |
| 722 | int i, d_idx = 0; |
| 723 | |
| 724 | if (fr->dir == OSMO_TRAU_DIR_UL) |
| 725 | cbits5 = ft_data_hr_up_bits; |
| 726 | else |
| 727 | cbits5 = ft_data_hr_down_bits; |
| 728 | |
| 729 | encode_sync16(trau_bits); |
| 730 | |
| 731 | /* C1 .. C5 */ |
| 732 | memcpy(trau_bits + 17, cbits5, 5); |
| 733 | /* C6 .. C15 */ |
| 734 | memcpy(trau_bits + 17 + 5, fr->c_bits + 5, 15 - 5); |
| 735 | |
| 736 | /* D1 .. D63 */ |
| 737 | for (i = 4; i < 4 + 9; i++) { |
| 738 | unsigned int offset = i * 8; |
| 739 | trau_bits[offset] = 1; |
| 740 | memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7); |
| 741 | d_idx += 7; |
| 742 | } |
| 743 | |
| 744 | memset(trau_bits + 13*8, 1, 9*8); |
| 745 | |
| 746 | /* D'1 .. D'63 (mapped to D64..D127) */ |
| 747 | for (i = 22; i < 22 + 9; i++) { |
| 748 | unsigned int offset = i * 8; |
| 749 | trau_bits[offset] = 1; |
| 750 | memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7); |
| 751 | d_idx += 7; |
| 752 | } |
| 753 | |
| 754 | memset(trau_bits + 31*8, 1, 9*8); |
| 755 | |
| 756 | return 40 * 8; |
| 757 | } |
| 758 | |
| 759 | /* TS 08.61 Section 5.2.1.1 */ |
| 760 | static int decode8_hr(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 761 | enum osmo_trau_frame_direction dir) |
| 762 | { |
| 763 | int i, d_idx = 0; |
| 764 | |
| 765 | /* C1 .. C5 */ |
| 766 | memcpy(fr->c_bits, trau_bits + 9, 5); |
| 767 | /* XC1 .. XC2 */ |
| 768 | memcpy(fr->xc_bits, trau_bits + 8 + 6, 2); |
| 769 | /* XC3 .. XC6 */ |
| 770 | memcpy(fr->xc_bits + 2, trau_bits + 2 * 8 + 2, 4); |
| 771 | /* D1 .. D2 */ |
| 772 | memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 6, 2); |
| 773 | d_idx += 2; |
| 774 | |
| 775 | /* D1 .. D44 */ |
| 776 | for (i = 3; i < 3 + 6; i++) { |
| 777 | int offset = i * 8; |
| 778 | memcpy(fr->d_bits + d_idx, trau_bits + offset + 1, 7); |
| 779 | d_idx += 7; |
| 780 | } |
| 781 | |
| 782 | /* CRC0 .. CRC2 */ |
| 783 | fr->crc_bits[2] = trau_bits[82]; |
| 784 | fr->crc_bits[1] = trau_bits[83]; |
| 785 | fr->crc_bits[0] = trau_bits[84]; |
| 786 | |
| 787 | /* D45 .. D48 */ |
| 788 | memcpy(fr->d_bits + d_idx, trau_bits + 85, 4); |
| 789 | |
| 790 | /* D49 .. D111 */ |
| 791 | for (i = 10; i < 10 + 10; i++) { |
| 792 | int offset = i * 8; |
| 793 | memcpy(fr->d_bits + d_idx, trau_bits + offset + 1, 7); |
| 794 | d_idx += 7; |
| 795 | } |
| 796 | /* D112 */ |
| 797 | fr->d_bits[d_idx++] = trau_bits[19 * 8 + 1]; |
| 798 | |
| 799 | /* C6 .. C9 */ |
| 800 | memcpy(fr->c_bits + 5, trau_bits + 19 * 8 + 2, 4); |
| 801 | |
| 802 | /* T1 .. T2 */ |
| 803 | fr->t_bits[0] = trau_bits[19 * 8 + 6]; |
| 804 | fr->t_bits[1] = trau_bits[19 * 8 + 7]; |
| 805 | |
| 806 | return 0; |
| 807 | } |
| 808 | |
| 809 | /* compute the odd parity bit of the given input bit sequence */ |
| 810 | static ubit_t compute_odd_parity(const ubit_t *in, unsigned int num_bits) |
| 811 | { |
| 812 | int i; |
| 813 | unsigned int sum = 0; |
| 814 | |
| 815 | for (i = 0; i < num_bits; i++) { |
| 816 | if (in[i]) |
| 817 | sum++; |
| 818 | } |
| 819 | |
| 820 | if (sum % 1) |
| 821 | return 0; |
| 822 | else |
| 823 | return 1; |
| 824 | } |
| 825 | |
| 826 | /* TS 08.61 Section 5.2.1.1 */ |
| 827 | static int encode8_hr(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 828 | { |
| 829 | int i, d_idx = 0; |
| 830 | |
| 831 | /* sync pattern */ |
| 832 | memset(trau_bits, 0, 8); |
| 833 | trau_bits[8] = 1; |
| 834 | trau_bits[16] = 0; |
| 835 | trau_bits[17] = 1; |
| 836 | for (i = 3; i < 20; i++) |
| 837 | trau_bits[i * 8] = 1; |
| 838 | |
| 839 | /* C1 .. C5 */ |
| 840 | ubit_t *cbits_out = trau_bits + 1 * 8 + 1; |
| 841 | if (fr->dir == OSMO_TRAU_DIR_UL) { |
| 842 | cbits_out[0] = 0; |
| 843 | cbits_out[1] = 0; |
| 844 | cbits_out[2] = 0; |
| 845 | cbits_out[3] = 1; |
| 846 | cbits_out[4] = 1; |
| 847 | } else { |
| 848 | cbits_out[0] = 0; |
| 849 | cbits_out[1] = 0; |
| 850 | cbits_out[2] = 0; |
| 851 | cbits_out[3] = fr->c_bits[3]; |
| 852 | cbits_out[4] = compute_odd_parity(cbits_out, 4); |
| 853 | } |
| 854 | |
| 855 | /* XC1 .. XC2 */ |
| 856 | memcpy(trau_bits + 1 * 8 + 6, fr->xc_bits, 2); |
| 857 | /* XC3 .. XC6 */ |
| 858 | memcpy(trau_bits + 2 * 8 + 2, fr->xc_bits, 4); |
| 859 | /* D1 .. D2 */ |
| 860 | memcpy(trau_bits + 2 * 8 + 6, fr->d_bits, 2); |
| 861 | d_idx += 2; |
| 862 | |
| 863 | /* D1 .. D44 */ |
| 864 | for (i = 3; i < 3 + 6; i++) { |
| 865 | int offset = i * 8; |
| 866 | memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7); |
| 867 | d_idx += 7; |
| 868 | }; |
| 869 | |
| 870 | /* CRC0 .. CRC2 */ |
| 871 | trau_bits[82] = fr->crc_bits[2]; |
| 872 | trau_bits[83] = fr->crc_bits[1]; |
| 873 | trau_bits[84] = fr->crc_bits[0]; |
| 874 | |
| 875 | /* D49 .. D111 */ |
| 876 | for (i = 10; i < 10 + 10; i++) { |
| 877 | int offset = i * 8; |
| 878 | memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7); |
| 879 | d_idx += 7; |
| 880 | } |
| 881 | /* D112 */ |
| 882 | trau_bits[19 * 8 + 1] = fr->d_bits[d_idx++]; |
| 883 | |
| 884 | /* C6 .. C9 */ |
| 885 | memcpy(trau_bits + 19 * 8 + 2, fr->c_bits + 5, 4); |
| 886 | |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 887 | /* T1 .. T2 */ |
| 888 | trau_bits[19 * 8 + 6] = fr->t_bits[0]; |
| 889 | trau_bits[19 * 8 + 7] = fr->t_bits[1]; |
| 890 | |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 891 | /* handle timing adjustment */ |
| 892 | return encode8_handle_ta(trau_bits, fr); |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 893 | } |
| 894 | |
| 895 | /* TS 08.61 Section 5.2.1.2.1 */ |
| 896 | static int decode8_amr_low(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 897 | enum osmo_trau_frame_direction dir) |
| 898 | { |
| 899 | int i, d_idx = 0; |
| 900 | |
| 901 | /* D1 .. D7 */ |
| 902 | memcpy(fr->d_bits + d_idx, trau_bits + 1 * 8 + 1, 7); |
| 903 | d_idx += 7; |
| 904 | /* C1 .. C5 */ |
| 905 | memcpy(fr->c_bits, trau_bits + 2 * 8 + 1, 5); |
| 906 | /* D8 .. D9 */ |
| 907 | memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 6, 2); |
| 908 | d_idx += 2; |
| 909 | /* D10 .. D15 */ |
| 910 | memcpy(fr->d_bits + d_idx, trau_bits + 3 * 8 + 2, 6); |
| 911 | d_idx += 6; |
| 912 | /* D16 .. D120 */ |
| 913 | for (i = 4; i < 19; i++) { |
| 914 | int offset = i * 8; |
| 915 | memcpy(fr->d_bits + d_idx, trau_bits + offset + 1, 7); |
| 916 | d_idx += 7; |
| 917 | } |
| 918 | /* D121 .. D126 */ |
| 919 | memcpy(fr->d_bits + d_idx, trau_bits + 19 * 8 + 1, 6); |
| 920 | d_idx += 6; |
| 921 | |
| 922 | /* T1 */ |
| 923 | fr->t_bits[0] = trau_bits[19 * 8 + 7]; |
| 924 | |
| 925 | return 0; |
| 926 | } |
| 927 | |
| 928 | /* TS 08.61 Section 5.2.1.2.1 */ |
| 929 | static int encode8_amr_low(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 930 | { |
| 931 | int i, d_idx = 0; |
| 932 | |
| 933 | /* sync pattern */ |
| 934 | memset(trau_bits, 0, 8); |
| 935 | trau_bits[8] = 1; |
| 936 | trau_bits[16] = 1; |
| 937 | trau_bits[24] = 0; |
| 938 | trau_bits[25] = 1; |
| 939 | for (i = 4; i < 20; i++) |
| 940 | trau_bits[i * 8] = 1; |
| 941 | |
| 942 | /* D1 .. D7 */ |
| 943 | memcpy(trau_bits + 1 * 8 + 1, fr->d_bits + d_idx, 7); |
| 944 | d_idx += 7; |
| 945 | /* C1 .. C5 */ |
| 946 | memcpy(trau_bits + 2 * 8 + 1, fr->c_bits, 5); |
| 947 | /* D8 .. D9 */ |
| 948 | memcpy(trau_bits + 2 * 8 + 6, fr->d_bits + d_idx, 2); |
| 949 | d_idx += 2; |
| 950 | /* D10 .. D15 */ |
| 951 | memcpy(trau_bits + 3 * 8 + 2, fr->d_bits + d_idx, 6); |
| 952 | d_idx += 6; |
| 953 | /* D16 .. D120 */ |
| 954 | for (i = 4; i < 19; i++) { |
| 955 | int offset = i * 8; |
| 956 | memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 7); |
| 957 | d_idx += 7; |
| 958 | } |
| 959 | /* D121 .. D126 */ |
| 960 | memcpy(trau_bits + 19 * 8 + 1, fr->d_bits + d_idx, 6); |
| 961 | d_idx += 6; |
| 962 | |
| 963 | /* T1 */ |
| 964 | trau_bits[19 * 8 + 7] = fr->t_bits[0]; |
| 965 | |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 966 | return encode8_handle_ta(trau_bits, fr); |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 967 | } |
| 968 | |
| 969 | /* TS 08.61 Section 5.2.1.2.2 */ |
| 970 | static int decode8_amr_67(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 971 | enum osmo_trau_frame_direction dir) |
| 972 | { |
| 973 | int i, d_idx = 0; |
| 974 | |
| 975 | /* D1 .. D7 */ |
| 976 | memcpy(fr->d_bits + d_idx, trau_bits + 1 * 8 + 1, 7); |
| 977 | d_idx += 7; |
| 978 | /* C1 .. C3 */ |
| 979 | memcpy(fr->c_bits, trau_bits + 2 * 8 + 1, 3); |
| 980 | /* D8 .. D11 */ |
| 981 | memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 4, 4); |
| 982 | d_idx += 4; |
| 983 | /* D12 .. D39 */ |
| 984 | for (i = 3; i < 7; i++) { |
| 985 | int offset = i * 8; |
| 986 | memcpy(fr->d_bits + d_idx, trau_bits + offset + 2, 7); |
| 987 | d_idx += 7; |
| 988 | } |
| 989 | |
| 990 | /* D40 .. D137 */ |
| 991 | for (i = 7; i < 20; i+= 2) { |
| 992 | int offset = i * 8; |
| 993 | memcpy(fr->d_bits + d_idx, trau_bits + offset + 1, 15); |
| 994 | d_idx += 15; |
| 995 | } |
| 996 | |
| 997 | return 0; |
| 998 | } |
| 999 | |
| 1000 | /* TS 08.61 Section 5.1.2.2 */ |
| 1001 | static int encode8_amr_67(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 1002 | { |
| 1003 | int i, d_idx = 0; |
| 1004 | |
| 1005 | /* sync pattern */ |
| 1006 | memset(trau_bits, 0, 8); |
| 1007 | trau_bits[1 * 8] = 1; |
| 1008 | trau_bits[2 * 8] = 1; |
| 1009 | trau_bits[3 * 8] = 1; |
| 1010 | trau_bits[4 * 8] = 1; |
| 1011 | trau_bits[5 * 8] = 0; |
| 1012 | for (i = 5; i < 20; i += 2) |
| 1013 | trau_bits[i * 8] = 1; |
| 1014 | |
| 1015 | /* D1 .. D7 */ |
| 1016 | memcpy(trau_bits + 1 * 8 + 1, fr->d_bits + d_idx, 7); |
| 1017 | d_idx += 7; |
| 1018 | /* C1 .. C3 */ |
| 1019 | memcpy(trau_bits + 2 * 8 + 1, fr->c_bits, 3); |
| 1020 | /* D8 .. D11 */ |
| 1021 | memcpy(trau_bits + 2 * 8 + 4, fr->d_bits + d_idx, 4); |
| 1022 | d_idx += 4; |
| 1023 | /* D12 .. D39 */ |
| 1024 | for (i = 3; i < 7; i++) { |
| 1025 | int offset = i * 8; |
| 1026 | memcpy(trau_bits + offset + 2, fr->d_bits + d_idx, 7); |
| 1027 | d_idx += 7; |
| 1028 | } |
| 1029 | |
| 1030 | /* D40 .. D137 */ |
| 1031 | for (i = 7; i < 20; i+= 2) { |
| 1032 | int offset = i * 8; |
| 1033 | memcpy(trau_bits + offset + 1, fr->d_bits + d_idx, 15); |
| 1034 | d_idx += 15; |
| 1035 | } |
| 1036 | |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 1037 | return encode8_handle_ta(trau_bits, fr); |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 1038 | } |
| 1039 | |
| 1040 | /* TS 08.61 Section 5.1.2.3 */ |
| 1041 | static int decode8_amr_74(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 1042 | enum osmo_trau_frame_direction dir) |
| 1043 | { |
| 1044 | int d_idx = 0; |
| 1045 | |
| 1046 | /* D1 .. D5 */ |
| 1047 | memcpy(fr->d_bits + d_idx, trau_bits + 3, 5); |
| 1048 | d_idx += 5; |
| 1049 | /* D6 .. D12 */ |
| 1050 | memcpy(fr->d_bits + d_idx, trau_bits + 1 * 8 + 1, 7); |
| 1051 | d_idx += 7; |
| 1052 | /* C1.. C3 */ |
| 1053 | memcpy(fr->c_bits, trau_bits + 2 * 8 + 1, 3); |
| 1054 | /* D13 .. D16 */ |
| 1055 | memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 4, 4); |
| 1056 | d_idx += 4; |
| 1057 | /* D17 .. D23 */ |
| 1058 | memcpy(fr->d_bits + d_idx, trau_bits + 3 * 8 + 1, 7); |
| 1059 | d_idx += 7; |
| 1060 | /* D24 .. D151 */ |
| 1061 | memcpy(fr->d_bits + d_idx, trau_bits + 4 * 8, 16 * 8); |
| 1062 | |
| 1063 | return 0; |
| 1064 | } |
| 1065 | |
| 1066 | /* TS 08.61 Section 5.1.2.3 */ |
| 1067 | static int encode8_amr_74(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 1068 | { |
| 1069 | int d_idx = 0; |
| 1070 | |
| 1071 | /* sync pattern */ |
| 1072 | trau_bits[0] = 0; |
| 1073 | trau_bits[1] = 0; |
| 1074 | trau_bits[2] = 1; |
| 1075 | trau_bits[1*8] = 0; |
| 1076 | trau_bits[2*8] = 1; |
| 1077 | trau_bits[3*8] = 0; |
| 1078 | |
| 1079 | /* D1 .. D5 */ |
| 1080 | memcpy(trau_bits + 3, fr->d_bits + d_idx, 5); |
| 1081 | d_idx += 5; |
| 1082 | /* D6 .. D12 */ |
| 1083 | memcpy(trau_bits + 1 * 8 + 1, fr->d_bits + d_idx, 7); |
| 1084 | d_idx += 7; |
| 1085 | /* C1.. C3 */ |
| 1086 | memcpy(trau_bits + 2 * 8 + 1, fr->c_bits, 3); |
| 1087 | /* D13 .. D16 */ |
| 1088 | memcpy(trau_bits + 2 * 8 + 4, fr->d_bits + d_idx, 4); |
| 1089 | d_idx += 4; |
| 1090 | /* D17 .. D23 */ |
| 1091 | memcpy(trau_bits + 3 * 8 + 1, fr->d_bits + d_idx, 7); |
| 1092 | d_idx += 7; |
| 1093 | /* D24 .. D151 */ |
| 1094 | memcpy(trau_bits + 4 * 8, fr->d_bits + d_idx, 16 * 8); |
| 1095 | |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 1096 | return encode8_handle_ta(trau_bits, fr); |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 1097 | } |
| 1098 | |
| 1099 | /* TS 08.61 Section 5.2.2 */ |
| 1100 | static int decode8_data(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 1101 | enum osmo_trau_frame_direction dir) |
| 1102 | { |
| 1103 | int i, d_idx = 0; |
| 1104 | |
| 1105 | /* C1 .. C5 */ |
| 1106 | memcpy(fr->c_bits, trau_bits + 1 * 8 + 1, 5); |
| 1107 | /* D1 .. D2 */ |
| 1108 | memcpy(fr->d_bits + d_idx, trau_bits + 1 * 8 + 6, 2); |
| 1109 | d_idx += 2; |
| 1110 | /* D3 .. D8 */ |
| 1111 | memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 2, 6); |
| 1112 | /* D9 .. D57 + D'1 .. D'57 */ |
| 1113 | for (i = 3; i < 20; i++) { |
| 1114 | memcpy(fr->d_bits + d_idx, trau_bits + i * 8 + 1, 7); |
| 1115 | d_idx += 7; |
| 1116 | } |
| 1117 | /* D'58 .. D'62 */ |
| 1118 | memcpy(fr->d_bits + d_idx, trau_bits + 19 * 8 + 1, 6); |
| 1119 | d_idx += 6; |
| 1120 | |
| 1121 | return 0; |
| 1122 | } |
| 1123 | |
| 1124 | /* TS 08.61 Section 5.2.2 */ |
| 1125 | static int encode8_data(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 1126 | { |
| 1127 | int i, d_idx = 0; |
| 1128 | |
| 1129 | /* sync pattern */ |
| 1130 | memset(trau_bits, 0, 8); |
| 1131 | trau_bits[1 * 8] = 1; |
| 1132 | trau_bits[2 * 8] = 0; |
| 1133 | trau_bits[2 * 8 + 1] = 1; |
| 1134 | for (i = 3; i < 19; i++) |
| 1135 | trau_bits[i * 8] = 1; |
| 1136 | trau_bits[19 * 8 + 7] = 1; |
| 1137 | |
| 1138 | /* C1 .. C5 */ |
| 1139 | memcpy(trau_bits + 1 * 8 + 1, fr->c_bits, 5); |
| 1140 | /* D1 .. D2 */ |
| 1141 | memcpy(trau_bits + 1 * 8 + 6, fr->d_bits + d_idx, 2); |
| 1142 | d_idx += 2; |
| 1143 | /* D3 .. D8 */ |
| 1144 | memcpy(trau_bits + 2 * 8 + 2, fr->d_bits + d_idx, 6); |
| 1145 | /* D9 .. D57 + D'1 .. D'57 */ |
| 1146 | for (i = 3; i < 20; i++) { |
| 1147 | memcpy(trau_bits + i * 8 + 1, fr->d_bits + d_idx, 7); |
| 1148 | d_idx += 7; |
| 1149 | } |
| 1150 | /* D'58 .. D'62 */ |
| 1151 | memcpy(trau_bits + 19 * 8 + 1, fr->d_bits + d_idx, 6); |
| 1152 | d_idx += 6; |
| 1153 | |
| 1154 | return 20 * 8; |
| 1155 | } |
| 1156 | |
| 1157 | /* TS 08.61 Section 5.2.3 */ |
| 1158 | static int decode8_oam(struct osmo_trau_frame *fr, const ubit_t *trau_bits, |
| 1159 | enum osmo_trau_frame_direction dir) |
| 1160 | { |
| 1161 | int i, d_idx = 0; |
| 1162 | |
| 1163 | /* C1 .. C5 */ |
| 1164 | memcpy(fr->c_bits, trau_bits + 1 * 8 + 1, 5); |
| 1165 | /* XC1 .. XC2 */ |
| 1166 | memcpy(fr->xc_bits, trau_bits + 1 * 8 + 6, 2); |
| 1167 | /* XC3 .. XC6 */ |
| 1168 | memcpy(fr->xc_bits + 2, trau_bits + 2 * 8 + 2, 4); |
| 1169 | /* D1 .. D2 */ |
| 1170 | memcpy(fr->d_bits + d_idx, trau_bits + 2 * 8 + 6, 2); |
| 1171 | d_idx += 2; |
| 1172 | /* D3 .. D114 */ |
| 1173 | for (i = 3; i < 19; i++) { |
| 1174 | memcpy(fr->d_bits + d_idx, trau_bits + i * 8 + 1, 7); |
| 1175 | d_idx += 7; |
| 1176 | } |
| 1177 | /* D115 .. D120 */ |
| 1178 | memcpy(fr->d_bits + d_idx, trau_bits + 19 * 8 + 1, 6); |
| 1179 | d_idx += 7; |
| 1180 | |
| 1181 | return 0; |
| 1182 | } |
| 1183 | |
| 1184 | /* TS 08.61 Section 5.2.3 */ |
| 1185 | static int encode8_oam(ubit_t *trau_bits, const struct osmo_trau_frame *fr) |
| 1186 | { |
| 1187 | int i, d_idx = 0; |
| 1188 | |
| 1189 | /* sync pattern */ |
| 1190 | memset(trau_bits, 0, 8); |
| 1191 | trau_bits[1 * 8 + 0] = 1; |
| 1192 | trau_bits[2 * 8 + 0] = 0; |
| 1193 | trau_bits[2 * 8 + 1] = 1; |
| 1194 | for (i = 3; i < 20; i++) |
| 1195 | trau_bits[i * 8] = 1; |
| 1196 | |
| 1197 | /* C1 .. C5 */ |
| 1198 | memcpy(trau_bits + 1 * 8 + 1, fr->c_bits, 5); |
| 1199 | /* XC1 .. XC2 */ |
| 1200 | memcpy(trau_bits + 1 * 8 + 6, fr->xc_bits, 2); |
| 1201 | /* XC3 .. XC6 */ |
| 1202 | memcpy(trau_bits + 2 * 8 + 2, fr->xc_bits + 2, 4); |
| 1203 | /* D1 .. D2 */ |
| 1204 | memcpy(trau_bits + 2 * 8 + 6, fr->d_bits + d_idx, 2); |
| 1205 | d_idx += 2; |
| 1206 | /* D3 .. D114 */ |
| 1207 | for (i = 3; i < 19; i++) { |
| 1208 | memcpy(trau_bits + i * 8 + 1, fr->d_bits + d_idx, 7); |
| 1209 | d_idx += 7; |
| 1210 | } |
| 1211 | /* D115 .. D120 */ |
| 1212 | memcpy(trau_bits + 19 * 8 + 1, fr->d_bits + d_idx, 6); |
| 1213 | d_idx += 7; |
| 1214 | |
| 1215 | return 20 * 8; |
| 1216 | } |
| 1217 | |
| 1218 | |
| 1219 | /*! Encode a TRAU frame from its decoded representation to a sequence of unpacked bits. |
| 1220 | * \param[out] bits caller-allocated buffer for unpacked outpud bits |
| 1221 | * \param[in] n_bits size of 'bits' oputput buffer in number of unpacked bits |
| 1222 | * \param[in] fr decoded representation of TRAU frame to be encoded |
| 1223 | * \return 0 number of unpacked output bits generated; negative in case of error */ |
| 1224 | int osmo_trau_frame_encode(ubit_t *bits, size_t n_bits, const struct osmo_trau_frame *fr) |
| 1225 | { |
Harald Welte | 95e2dfb | 2020-08-02 16:01:14 +0200 | [diff] [blame] | 1226 | /* check for sufficient space provided by caller in output buffer */ |
| 1227 | switch (fr->type) { |
| 1228 | case OSMO_TRAU16_FT_FR: |
| 1229 | case OSMO_TRAU16_FT_EFR: |
| 1230 | case OSMO_TRAU16_FT_HR: |
| 1231 | case OSMO_TRAU16_FT_AMR: |
| 1232 | /* timing alignment may happen: increased space requirement */ |
| 1233 | if (n_bits < 2 * 40 * 8 - 1) |
| 1234 | return -ENOSPC; |
| 1235 | break; |
| 1236 | case OSMO_TRAU16_FT_OAM: |
| 1237 | case OSMO_TRAU16_FT_IDLE: |
| 1238 | case OSMO_TRAU16_FT_DATA_HR: |
| 1239 | case OSMO_TRAU16_FT_DATA: |
| 1240 | case OSMO_TRAU16_FT_D145_SYNC: |
| 1241 | case OSMO_TRAU16_FT_EDATA: |
| 1242 | if (n_bits < 1 * 40 * 8) |
| 1243 | return -ENOSPC; |
| 1244 | break; |
| 1245 | case OSMO_TRAU8_SPEECH: |
| 1246 | case OSMO_TRAU8_AMR_LOW: |
| 1247 | case OSMO_TRAU8_AMR_6k7: |
| 1248 | case OSMO_TRAU8_AMR_7k4: |
| 1249 | /* timing alignment may happen: increased space requirement */ |
| 1250 | if (n_bits < 2 * 20 * 8 - 1) |
| 1251 | return -ENOSPC; |
| 1252 | case OSMO_TRAU8_DATA: |
| 1253 | case OSMO_TRAU8_OAM: |
| 1254 | if (n_bits < 1 * 20 * 8) |
| 1255 | return -ENOSPC; |
| 1256 | break; |
| 1257 | case OSMO_TRAU_FT_NONE: |
| 1258 | break; |
| 1259 | default: |
| 1260 | return -EINVAL; |
| 1261 | } |
| 1262 | |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 1263 | switch (fr->type) { |
| 1264 | case OSMO_TRAU16_FT_FR: |
| 1265 | case OSMO_TRAU16_FT_EFR: |
| 1266 | return encode16_fr(bits, fr); |
| 1267 | case OSMO_TRAU16_FT_HR: |
| 1268 | return encode16_hr(bits, fr); |
| 1269 | case OSMO_TRAU16_FT_AMR: |
| 1270 | return encode16_amr(bits, fr); |
| 1271 | case OSMO_TRAU16_FT_OAM: |
| 1272 | return encode16_oam(bits, fr); |
| 1273 | case OSMO_TRAU16_FT_IDLE: |
| 1274 | return encode16_idle(bits, fr); |
| 1275 | case OSMO_TRAU16_FT_DATA_HR: |
| 1276 | return encode16_data_hr(bits, fr); |
| 1277 | case OSMO_TRAU16_FT_DATA: |
| 1278 | return encode16_data(bits, fr); |
| 1279 | case OSMO_TRAU16_FT_D145_SYNC: |
| 1280 | case OSMO_TRAU16_FT_EDATA: |
| 1281 | return encode16_edata(bits, fr); |
| 1282 | case OSMO_TRAU8_SPEECH: |
| 1283 | return encode8_hr(bits, fr); |
| 1284 | case OSMO_TRAU8_DATA: |
| 1285 | return encode8_data(bits, fr); |
| 1286 | case OSMO_TRAU8_OAM: |
| 1287 | return encode8_oam(bits, fr); |
| 1288 | case OSMO_TRAU8_AMR_LOW: |
| 1289 | return encode8_amr_low(bits, fr); |
| 1290 | case OSMO_TRAU8_AMR_6k7: |
| 1291 | return encode8_amr_67(bits, fr); |
| 1292 | case OSMO_TRAU8_AMR_7k4: |
| 1293 | return encode8_amr_74(bits, fr); |
| 1294 | case OSMO_TRAU_FT_NONE: |
| 1295 | default: |
| 1296 | return -EINVAL; |
| 1297 | } |
| 1298 | } |
| 1299 | |
| 1300 | /*! Decode/parse a 16k TRAU frame from unpacked bits to decoded format. |
| 1301 | * \param[out] fr caller-allocated output data structure |
| 1302 | * \param[in] bits unpacked bits containing raw TRAU frame; must be aligned |
| 1303 | * \param[in] dir direction (uplink/downlink) |
| 1304 | * \returns 0 in case of success; negative on error */ |
| 1305 | int osmo_trau_frame_decode_16k(struct osmo_trau_frame *fr, const ubit_t *bits, |
| 1306 | enum osmo_trau_frame_direction dir) |
| 1307 | { |
| 1308 | uint8_t cbits5 = get_bits(bits, 17, 5); |
| 1309 | |
| 1310 | fr->type = OSMO_TRAU_FT_NONE; |
| 1311 | fr->dir = dir; |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 1312 | fr->dl_ta_usec = 0; |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 1313 | |
| 1314 | switch (cbits5) { |
| 1315 | case TRAU_FT_FR_UP: |
| 1316 | case TRAU_FT_FR_DOWN: |
| 1317 | fr->type = OSMO_TRAU16_FT_FR; |
| 1318 | return decode16_fr(fr, bits, dir); |
| 1319 | case TRAU_FT_IDLE_UP: |
| 1320 | case TRAU_FT_IDLE_DOWN: |
| 1321 | fr->type = OSMO_TRAU16_FT_IDLE; |
| 1322 | return decode16_fr(fr, bits, dir); |
| 1323 | case TRAU_FT_EFR: |
| 1324 | fr->type = OSMO_TRAU16_FT_EFR; |
| 1325 | return decode16_fr(fr, bits, dir); |
| 1326 | case TRAU_FT_AMR: |
| 1327 | fr->type = OSMO_TRAU16_FT_AMR; |
| 1328 | return decode16_amr(fr, bits, dir); |
| 1329 | case TRAU_FT_OM_UP: |
| 1330 | case TRAU_FT_OM_DOWN: |
| 1331 | fr->type = OSMO_TRAU16_FT_OAM; |
| 1332 | return decode16_oam(fr, bits, dir); |
| 1333 | case TRAU_FT_DATA_UP: |
| 1334 | case TRAU_FT_DATA_DOWN: |
| 1335 | fr->type = OSMO_TRAU16_FT_DATA; |
| 1336 | return decode16_data(fr, bits, dir); |
| 1337 | case TRAU_FT_HR_UP: |
| 1338 | case TRAU_FT_HR_DOWN: |
| 1339 | fr->type = OSMO_TRAU16_FT_HR; |
| 1340 | return decode16_hr(fr, bits, dir); |
| 1341 | case TRAU_FT_DATA_UP_HR: |
| 1342 | case TRAU_FT_DATA_DOWN_HR: |
| 1343 | fr->type = OSMO_TRAU16_FT_DATA_HR; |
| 1344 | return decode16_data_hr(fr, bits, dir); |
| 1345 | case TRAU_FT_EDATA: |
| 1346 | fr->type = OSMO_TRAU16_FT_EDATA; |
| 1347 | return decode16_edata(fr, bits, dir); |
| 1348 | case TRAU_FT_D145_SYNC: |
| 1349 | fr->type = OSMO_TRAU16_FT_D145_SYNC; |
| 1350 | return decode16_edata(fr, bits, dir); |
| 1351 | |
| 1352 | default: |
| 1353 | return -EINVAL; |
| 1354 | } |
| 1355 | } |
| 1356 | |
| 1357 | #define TRAU8_FT_AMR_NO_SPEECH_CMI 0x10 /* 1, 0, 0, 0, 0 */ |
| 1358 | #define TRAU8_FT_AMR_NO_SPEECH_CMR 0x14 /* 1, 0, 1, 0, 0 */ |
| 1359 | #define TRAU8_FT_AMR_475_515_590 0..7 |
| 1360 | |
| 1361 | const uint8_t bit8_0[16] = { 0, }; |
| 1362 | |
| 1363 | /*!< check sync pattern for hr/data/oam */ |
| 1364 | static bool is_hr(const ubit_t *bits) |
| 1365 | { |
| 1366 | int i; |
| 1367 | |
| 1368 | /* TS 08.61 Section 6.8.2.1.1 */ |
| 1369 | if (memcmp(bits, bit8_0, sizeof(bit8_0))) |
| 1370 | return false; |
| 1371 | if (bits[8] != 1) |
| 1372 | return false; |
| 1373 | if (bits[16] != 0 || bits[17] != 1) |
| 1374 | return false; |
| 1375 | for (i = 24; i < 20 * 8; i += 16) { |
| 1376 | if (bits[i] != 1) |
| 1377 | return false; |
| 1378 | } |
| 1379 | return true; |
| 1380 | } |
| 1381 | |
| 1382 | |
| 1383 | /*!< check sync pattern for AMR No_Speech + low bit rate */ |
| 1384 | static bool is_amr_low(const ubit_t *bits) |
| 1385 | { |
| 1386 | int i; |
| 1387 | |
| 1388 | /* TS 08.61 Section 6.8.2.1.2 */ |
| 1389 | if (memcmp(bits, bit8_0, sizeof(bit8_0))) |
| 1390 | return false; |
| 1391 | if (bits[8] != 1) |
| 1392 | return false; |
| 1393 | if (bits[16] != 1) |
| 1394 | return false; |
| 1395 | if (bits[24] != 0 || bits[25] != 1) |
| 1396 | return false; |
| 1397 | for (i = 32; i < 20 * 8; i += 16) { |
| 1398 | if (bits[i] != 1) |
| 1399 | return false; |
| 1400 | } |
| 1401 | return true; |
| 1402 | } |
| 1403 | |
| 1404 | /*!< check sync pattern for AMR 6.7kBit/s */ |
| 1405 | static bool is_amr_67(const ubit_t *bits) |
| 1406 | { |
| 1407 | int i; |
| 1408 | |
| 1409 | /* TS 08.61 Section 6.8.2.1.3 */ |
| 1410 | if (memcmp(bits, bit8_0, sizeof(bit8_0))) |
| 1411 | return false; |
| 1412 | if (bits[8] != 1) |
| 1413 | return false; |
| 1414 | if (bits[16] != 1) |
| 1415 | return false; |
| 1416 | if (bits[24] != 1) |
| 1417 | return false; |
| 1418 | if (bits[32] != 1) |
| 1419 | return false; |
| 1420 | if (bits[40] != 0) |
| 1421 | return false; |
| 1422 | for (i = 48; i < 20 * 8; i+= 16) |
| 1423 | if (bits[i] != 1) |
| 1424 | return false; |
| 1425 | |
| 1426 | return true; |
| 1427 | } |
| 1428 | |
| 1429 | /*!< check sync pattern for AMR 7.4kBit/s */ |
| 1430 | static bool is_amr_74(const ubit_t *bits) |
| 1431 | { |
| 1432 | if (bits[0] != 0 || bits[1] != 0 || bits[2] != 0) |
| 1433 | return false; |
| 1434 | if (bits[8] != 0) |
| 1435 | return false; |
| 1436 | if (bits[16] != 1) |
| 1437 | return false; |
| 1438 | if (bits[24] != 0) |
| 1439 | return false; |
| 1440 | |
| 1441 | return true; |
| 1442 | } |
| 1443 | |
| 1444 | /*! Decode/parse a 8k TRAU frame from unpacked bits to decoded format. |
| 1445 | * \param[out] fr caller-allocated output data structure |
| 1446 | * \param[in] bits unpacked bits containing raw TRAU frame; must be aligned |
| 1447 | * \param[in] dir direction (uplink/downlink) |
| 1448 | * \returns 0 in case of success; negative on error */ |
| 1449 | int osmo_trau_frame_decode_8k(struct osmo_trau_frame *fr, const ubit_t *bits, |
| 1450 | enum osmo_trau_frame_direction dir) |
| 1451 | { |
| 1452 | fr->type = OSMO_TRAU_FT_NONE; |
| 1453 | fr->dir = dir; |
Harald Welte | dd9ee98 | 2020-08-02 15:53:46 +0200 | [diff] [blame] | 1454 | fr->dl_ta_usec = 0; |
Harald Welte | 254b924 | 2020-05-11 08:38:51 +0200 | [diff] [blame] | 1455 | |
| 1456 | if (is_hr(bits)) { |
| 1457 | /* normal sync pattern */ |
| 1458 | uint8_t cbits5 = get_bits(bits, 9, 5); |
| 1459 | if (dir == OSMO_TRAU_DIR_UL) { |
| 1460 | switch (cbits5) { /* Section 5.2.4.1.1 */ |
| 1461 | case 0x02: |
| 1462 | return decode8_hr(fr, bits, dir); |
| 1463 | case 0x07: |
| 1464 | return decode8_data(fr, bits, dir); |
| 1465 | case 0x13: |
| 1466 | return decode8_oam(fr, bits, dir); |
| 1467 | } |
| 1468 | } else { |
| 1469 | /* Downlink */ |
| 1470 | switch (cbits5 >> 2) { /* Section 5.2.4.1.2 */ |
| 1471 | case 0: |
| 1472 | return decode8_hr(fr, bits, dir); |
| 1473 | case 1: |
| 1474 | return decode8_data(fr, bits, dir); |
| 1475 | case 2: |
| 1476 | return decode8_oam(fr, bits, dir); |
| 1477 | } |
| 1478 | } |
| 1479 | } else if (is_amr_low(bits)) { |
| 1480 | return decode8_amr_low(fr, bits, dir); |
| 1481 | } else if (is_amr_67(bits)) { |
| 1482 | return decode8_amr_67(fr, bits, dir); |
| 1483 | } else if (is_amr_74(bits)) { |
| 1484 | return decode8_amr_74(fr, bits, dir); |
| 1485 | } |
| 1486 | |
| 1487 | return -EINVAL; |
| 1488 | } |
| 1489 | |
| 1490 | /* }@ */ |