diff options
Diffstat (limited to 'src/isdn/v110.c')
| -rw-r--r-- | src/isdn/v110.c | 590 |
1 files changed, 590 insertions, 0 deletions
diff --git a/src/isdn/v110.c b/src/isdn/v110.c new file mode 100644 index 00000000..b4bc4e30 --- /dev/null +++ b/src/isdn/v110.c @@ -0,0 +1,590 @@ +/* V.110 frames according to ITU-T V.110 + * + * This code implements the following functionality: + * - parsing/encoding of osmo_v110_decoded_frame from/to actual 80-bit V.110 frame + * - synchronous rate adapting of user bit rate to V.110 D-bits as per Table 6 + * + * It is (at least initially) a very "naive" implementation, as it first and foremost + * aims to be functional and correct, rather than efficient in any way. Hence it + * operates on unpacked bits (ubit_t, 1 bit per byte), and has various intermediate + * representations and indirect function calls. If needed, a more optimized variant + * can always be developed later on. + */ + +/* (C) 2022 by Harald Welte <laforge@osmocom.org> + * + * SPDX-License-Identifier: GPL-2.0+ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 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. + */ + +#include <stdint.h> +#include <errno.h> + +#include <osmocom/core/bits.h> + +#include <osmocom/isdn/v110.h> + +/************************************************************************* + * V.110 frame decoding/encoding (ubits <-> struct with D/S/X/E bits) + *************************************************************************/ + +/*! Decode a 80-bit V.110 frame present as 80 ubits into a struct osmo_v110_decoded_frame. + * \param[out] fr caller-allocated output data structure, filled by this function + * \param[in] ra_bits One V.110 frame as 80 unpacked bits. + * \param[in] n_bits number of unpacked bits provided in ra_bits + * \returns 0 in case of success; negative on error. */ +int osmo_v110_decode_frame(struct osmo_v110_decoded_frame *fr, const ubit_t *ra_bits, size_t n_bits) +{ + if (n_bits < 80) + return -EINVAL; + + /* X1 .. X2 */ + fr->x_bits[0] = ra_bits[2 * 8 + 7]; + fr->x_bits[1] = ra_bits[7 * 8 + 7]; + + /* S1, S3, S4, S6, S8, S9 */ + fr->s_bits[0] = ra_bits[1 * 8 + 7]; + fr->s_bits[2] = ra_bits[3 * 8 + 7]; + fr->s_bits[3] = ra_bits[4 * 8 + 7]; + fr->s_bits[5] = ra_bits[6 * 8 + 7]; + fr->s_bits[7] = ra_bits[8 * 8 + 7]; + fr->s_bits[8] = ra_bits[9 * 8 + 7]; + + /* E1 .. E7 */ + memcpy(fr->e_bits, ra_bits + 5 * 8 + 1, 7); + + /* D-bits */ + memcpy(fr->d_bits + 0 * 6, ra_bits + 1 * 8 + 1, 6); + memcpy(fr->d_bits + 1 * 6, ra_bits + 2 * 8 + 1, 6); + memcpy(fr->d_bits + 2 * 6, ra_bits + 3 * 8 + 1, 6); + memcpy(fr->d_bits + 3 * 6, ra_bits + 4 * 8 + 1, 6); + + memcpy(fr->d_bits + 4 * 6, ra_bits + 6 * 8 + 1, 6); + memcpy(fr->d_bits + 5 * 6, ra_bits + 7 * 8 + 1, 6); + memcpy(fr->d_bits + 6 * 6, ra_bits + 8 * 8 + 1, 6); + memcpy(fr->d_bits + 7 * 6, ra_bits + 9 * 8 + 1, 6); + + return 0; +} + +/*! Encode a struct osmo_v110_decoded_frame into an 80-bit V.110 frame as ubits. + * \param[out] ra_bits caller-provided output buffer at leat 80 ubits large + * \param[in] n_bits length of ra_bits. Must be at least 80. + * \param[in] input data structure + * \returns number of bits written to ra_bits */ +int osmo_v110_encode_frame(ubit_t *ra_bits, size_t n_bits, const struct osmo_v110_decoded_frame *fr) +{ + if (n_bits < 80) + return -ENOSPC; + + /* alignment pattern */ + memset(ra_bits+0, 0, 8); + for (int i = 1; i < 10; i++) + ra_bits[i*8] = 1; + + /* X1 .. X2 */ + ra_bits[2 * 8 + 7] = fr->x_bits[0]; + ra_bits[7 * 8 + 7] = fr->x_bits[1]; + + /* S1, S3, S4, S6, S8, S9 */ + ra_bits[1 * 8 + 7] = fr->s_bits[0]; + ra_bits[3 * 8 + 7] = fr->s_bits[2]; + ra_bits[4 * 8 + 7] = fr->s_bits[3]; + ra_bits[6 * 8 + 7] = fr->s_bits[5]; + ra_bits[8 * 8 + 7] = fr->s_bits[7]; + ra_bits[9 * 8 + 7] = fr->s_bits[8]; + + /* E1 .. E7 */ + memcpy(ra_bits + 5 * 8 + 1, fr->e_bits, 7); + + /* D-bits */ + memcpy(ra_bits + 1 * 8 + 1, fr->d_bits + 0 * 6, 6); + memcpy(ra_bits + 2 * 8 + 1, fr->d_bits + 1 * 6, 6); + memcpy(ra_bits + 3 * 8 + 1, fr->d_bits + 2 * 6, 6); + memcpy(ra_bits + 4 * 8 + 1, fr->d_bits + 3 * 6, 6); + + memcpy(ra_bits + 6 * 8 + 1, fr->d_bits + 4 * 6, 6); + memcpy(ra_bits + 7 * 8 + 1, fr->d_bits + 5 * 6, 6); + memcpy(ra_bits + 8 * 8 + 1, fr->d_bits + 6 * 6, 6); + memcpy(ra_bits + 9 * 8 + 1, fr->d_bits + 7 * 6, 6); + + return 10 * 8; +} + +/*! Print a encoded V.110 frame in the same table-like structure as the spec. + * \param outf output FILE stream to which to dump + * \param[in] fr unpacked bits to dump + * \param[in] in_len length of unpacked bits available at fr. */ +void osmo_v110_ubit_dump(FILE *outf, const ubit_t *fr, size_t in_len) +{ + if (in_len < 80) + fprintf(outf, "short input data\n"); + + for (unsigned int octet = 0; octet < 10; octet++) { + fprintf(outf, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", + fr[octet * 8 + 0], fr[octet * 8 + 1], fr[octet * 8 + 2], fr[octet * 8 + 3], + fr[octet * 8 + 4], fr[octet * 8 + 5], fr[octet * 8 + 6], fr[octet * 8 + 7]); + } +} + +/************************************************************************* + * RA1 synchronous rate adaptation + *************************************************************************/ + +/* I actually couldn't find any reference as to the value of F(ill) bits */ +#define F 1 + +/*! E1/E2/E3 bit values as per Table 5/V.110 */ +const ubit_t osmo_v110_e1e2e3[_NUM_OSMO_V110_SYNC_RA1][3] = { + [OSMO_V110_SYNC_RA1_600] = { 1, 0, 0 }, + [OSMO_V110_SYNC_RA1_1200] = { 0, 1, 0 }, + [OSMO_V110_SYNC_RA1_2400] = { 1, 1, 0 }, + [OSMO_V110_SYNC_RA1_4800] = { 0, 1, 1 }, + [OSMO_V110_SYNC_RA1_7200] = { 1, 0, 1 }, + [OSMO_V110_SYNC_RA1_9600] = { 0, 1, 1 }, + [OSMO_V110_SYNC_RA1_12000] = { 0, 0, 1 }, + [OSMO_V110_SYNC_RA1_14400] = { 1, 0, 1 }, + [OSMO_V110_SYNC_RA1_19200] = { 0, 1, 1 }, + [OSMO_V110_SYNC_RA1_24000] = { 0, 0, 1 }, + [OSMO_V110_SYNC_RA1_28800] = { 1, 0, 1 }, + [OSMO_V110_SYNC_RA1_38400] = { 0, 1, 1 }, +}; + +/*! Adapt from 6 synchronous 600bit/s input bits to a decoded V.110 frame. + * \param[out] fr caller-allocated output frame to which E+D bits are stored + * \param[in] d_in input user bits + * \param[in] in_len number of bits in d_in. Must be 6. + * \returns 0 on success; negative in case of error. */ +static int v110_adapt_600_to_IR8000(struct osmo_v110_decoded_frame *fr, const ubit_t *d_in, size_t in_len) +{ + if (in_len != 6) + return -EINVAL; + + /* Table 6a / V.110 */ + osmo_v110_e1e2e3_set(fr->e_bits, OSMO_V110_SYNC_RA1_600); + for (int i = 0; i < 6; i++) + memset(fr->d_bits + i*8, d_in[i], 8); + + return 0; +} + +static int v110_adapt_IR8000_to_600(ubit_t *d_out, size_t out_len, const struct osmo_v110_decoded_frame *fr) +{ + if (out_len < 6) + return -ENOSPC; + + if (osmo_v110_e1e2e3_cmp(fr->e_bits, OSMO_V110_SYNC_RA1_600)) + return -EINVAL; + + for (int i = 0; i < 6; i++) { + /* we only use one of the bits, not some kind of consistency check or majority vote */ + d_out[i] = fr->d_bits[i*8]; + } + + return 6; +} + +/*! Adapt from 12 synchronous 1200bit/s input bits to a decoded V.110 frame. + * \param[out] fr caller-allocated output frame to which E+D bits are stored + * \param[in] d_in input user bits + * \param[in] in_len number of bits in d_in. Must be 12. + * \returns 0 on success; negative in case of error. */ +static int v110_adapt_1200_to_IR8000(struct osmo_v110_decoded_frame *fr, const ubit_t *d_in, size_t in_len) +{ + if (in_len != 12) + return -EINVAL; + + /* Table 6b / V.110 */ + osmo_v110_e1e2e3_set(fr->e_bits, OSMO_V110_SYNC_RA1_1200); + for (int i = 0; i < 12; i++) + memset(fr->d_bits + i*4, d_in[i], 4); + + return 0; +} + +static int v110_adapt_IR8000_to_1200(ubit_t *d_out, size_t out_len, const struct osmo_v110_decoded_frame *fr) +{ + if (out_len < 12) + return -ENOSPC; + + if (osmo_v110_e1e2e3_cmp(fr->e_bits, OSMO_V110_SYNC_RA1_1200)) + return -EINVAL; + + for (int i = 0; i < 12; i++) { + /* we only use one of the bits, not some kind of consistency check or majority vote */ + d_out[i] = fr->d_bits[i*4]; + } + + return 12; +} + +/*! Adapt from 24 synchronous 2400bit/s input bits to a decoded V.110 frame. + * \param[out] fr caller-allocated output frame to which E+D bits are stored + * \param[in] d_in input user bits + * \param[in] in_len number of bits in d_in. Must be 24. + * \returns 0 on success; negative in case of error. */ +static int v110_adapt_2400_to_IR8000(struct osmo_v110_decoded_frame *fr, const ubit_t *d_in, size_t in_len) +{ + if (in_len != 24) + return -EINVAL; + + /* Table 6c / V.110 */ + osmo_v110_e1e2e3_set(fr->e_bits, OSMO_V110_SYNC_RA1_2400); + for (int i = 0; i < 24; i++) { + fr->d_bits[i*2 + 0] = d_in[i]; + fr->d_bits[i*2 + 1] = d_in[i]; + } + + return 0; +} + +static int v110_adapt_IR8000_to_2400(ubit_t *d_out, size_t out_len, const struct osmo_v110_decoded_frame *fr) +{ + if (out_len < 24) + return -ENOSPC; + + /* Table 6c / V.110 */ + if (osmo_v110_e1e2e3_cmp(fr->e_bits, OSMO_V110_SYNC_RA1_2400)) + return -EINVAL; + + for (int i = 0; i < 24; i++) { + /* we only use one of the bits, not some kind of consistency check or majority vote */ + d_out[i] = fr->d_bits[i*2]; + } + + return 24; +} + +/*! Adapt from 36 synchronous N x 3600bit/s input bits to a decoded V.110 frame. + * \param[out] fr caller-allocated output frame to which E+D bits are stored + * \param[in] d_in input user bits + * \param[in] in_len number of bits in d_in. Must be 36. + * \returns 0 on success; negative in case of error. */ +static int v110_adapt_Nx3600_to_IR(struct osmo_v110_decoded_frame *fr, const ubit_t *d_in, size_t in_len) +{ + int d_idx = 0; + + if (in_len != 36) + return -EINVAL; + + /* Table 6d / V.110 (7200 is one of Nx3600) */ + osmo_v110_e1e2e3_set(fr->e_bits, OSMO_V110_SYNC_RA1_7200); + + memcpy(fr->d_bits + d_idx, d_in + 0, 10); d_idx += 10; /* D1..D10 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + memcpy(fr->d_bits + d_idx, d_in + 10, 2); d_idx += 2; /* D11..D12 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + memcpy(fr->d_bits + d_idx, d_in + 12, 2); d_idx += 2; /* D13..D14 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + memcpy(fr->d_bits + d_idx, d_in + 14, 14); d_idx += 14; /* D15..D28 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + memcpy(fr->d_bits + d_idx, d_in + 28, 2); d_idx += 2; /* D29..D30 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + memcpy(fr->d_bits + d_idx, d_in + 30, 2); d_idx += 2; /* D31..D32 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + memcpy(fr->d_bits + d_idx, d_in + 32, 4); d_idx += 4; /* D33..D36 */ + + OSMO_ASSERT(d_idx == 48); + + return 0; +} + +static int v110_adapt_IR_to_Nx3600(ubit_t *d_out, size_t out_len, const struct osmo_v110_decoded_frame *fr) +{ + int d_idx = 0; + + if (out_len < 36) + return -ENOSPC; + + /* Table 6d / V.110 (7200 is one of Nx3600) */ + if (osmo_v110_e1e2e3_cmp(fr->e_bits, OSMO_V110_SYNC_RA1_7200)) + return -EINVAL; + + memcpy(d_out + 0, fr->d_bits + d_idx, 10); d_idx += 10; /* D1..D10 */ + d_idx += 2; + memcpy(d_out + 10, fr->d_bits + d_idx, 2); d_idx += 2; /* D11..D12 */ + d_idx += 2; + memcpy(d_out + 12, fr->d_bits + d_idx, 2); d_idx += 2; /* D13..D14 */ + d_idx += 2; + memcpy(d_out + 14, fr->d_bits + d_idx, 14); d_idx += 14;/* D15..D28 */ + d_idx += 2; + memcpy(d_out + 28, fr->d_bits + d_idx, 2); d_idx += 2; /* D29..D30 */ + d_idx += 2; + memcpy(d_out + 30, fr->d_bits + d_idx, 2); d_idx += 2; /* D31..D32 */ + d_idx += 2; + memcpy(d_out + 32, fr->d_bits + d_idx, 4); d_idx += 4; /* D33..D36 */ + + OSMO_ASSERT(d_idx == 48); + + return 36; +} + + +/*! Adapt from 48 synchronous N x 4800bit/s input bits to a decoded V.110 frame. + * \param[out] fr caller-allocated output frame to which E+D bits are stored + * \param[in] d_in input user bits + * \param[in] in_len number of bits in d_in. Must be 48. + * \returns 0 on success; negative in case of error. */ +static int v110_adapt_Nx4800_to_IR(struct osmo_v110_decoded_frame *fr, const ubit_t *d_in, size_t in_len) +{ + if (in_len != 48) + return -EINVAL; + + /* Table 6e / V.110 (4800 is one of Nx4800) */ + osmo_v110_e1e2e3_set(fr->e_bits, OSMO_V110_SYNC_RA1_4800); + + memcpy(fr->d_bits, d_in, 48); + + return 0; +} + +static int v110_adapt_IR_to_Nx4800(ubit_t *d_out, size_t out_len, const struct osmo_v110_decoded_frame *fr) +{ + if (out_len < 48) + return -ENOSPC; + + /* Table 6e / V.110 (4800 is one of Nx4800) */ + if (osmo_v110_e1e2e3_cmp(fr->e_bits, OSMO_V110_SYNC_RA1_4800)) + return -EINVAL; + + memcpy(d_out, fr->d_bits, 48); + + return 48; +} + +/*! Adapt from 30 synchronous N x 12000bit/s input bits to a decoded V.110 frame. + * \param[out] fr caller-allocated output frame to which E+D bits are stored + * \param[in] d_in input user bits + * \param[in] in_len number of bits in d_in. Must be 30. + * \returns 0 on success; negative in case of error. */ +static int v110_adapt_Nx12000_to_IR(struct osmo_v110_decoded_frame *fr, const ubit_t *d_in, size_t in_len) +{ + int d_idx = 0; + + if (in_len != 30) + return -EINVAL; + + /* Table 6f / V.110 (12000 is one of Nx12000) */ + osmo_v110_e1e2e3_set(fr->e_bits, OSMO_V110_SYNC_RA1_12000); + + memcpy(fr->d_bits + d_idx, d_in + 0, 10); d_idx += 10; /* D1..D10 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + memcpy(fr->d_bits + d_idx, d_in + 10, 2); d_idx += 2; /* D11..D12 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + memcpy(fr->d_bits + d_idx, d_in + 12, 2); d_idx += 2; /* D13..D14 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + fr->d_bits[d_idx++] = d_in[14]; /* D15 */ + memset(fr->d_bits + d_idx, F, 3); d_idx += 3; + memcpy(fr->d_bits + d_idx, d_in + 15, 10); d_idx += 10; /* D16..D25 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + memcpy(fr->d_bits + d_idx, d_in + 25, 2); d_idx += 2; /* D26..D27 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + memcpy(fr->d_bits + d_idx, d_in + 27, 2); d_idx += 2; /* D28..D29 */ + memset(fr->d_bits + d_idx, F, 2); d_idx += 2; + fr->d_bits[d_idx++] = d_in[29]; /* D30 */ + memset(fr->d_bits + d_idx, F, 3); d_idx += 3; + + OSMO_ASSERT(d_idx == 48); + + return 0; +} + +static int v110_adapt_IR_to_Nx12000(ubit_t *d_out, size_t out_len, const struct osmo_v110_decoded_frame *fr) +{ + int d_idx = 0; + + if (out_len < 30) + return -ENOSPC; + + /* Table 6f / V.110 (12000 is one of Nx12000) */ + if (osmo_v110_e1e2e3_cmp(fr->e_bits, OSMO_V110_SYNC_RA1_12000)) + return -EINVAL; + + memcpy(d_out + 0, fr->d_bits + d_idx, 10); d_idx += 10; /* D1..D10 */ + d_idx += 2; + memcpy(d_out + 10, fr->d_bits + d_idx, 2); d_idx += 2; /* D11..D12 */ + d_idx += 2; + memcpy(d_out + 12, fr->d_bits + d_idx, 2); d_idx += 2; /* D13..D14 */ + d_idx += 2; + d_out[14] = fr->d_bits[d_idx++]; /* D15 */ + d_idx += 3; + memcpy(d_out + 15, fr->d_bits + d_idx, 10); d_idx += 10;/* D16..D25 */ + d_idx += 2; + memcpy(d_out + 25, fr->d_bits + d_idx, 2); d_idx += 2; /* D26..D27 */ + d_idx += 2; + memcpy(d_out + 27, fr->d_bits + d_idx, 2); d_idx += 2; /* D28..D29 */ + d_idx += 2; + d_out[29] = fr->d_bits[d_idx++]; /* D30 */ + d_idx += 3; + + OSMO_ASSERT(d_idx == 48); + + return 30; +} + +/* definition of a synchronous V.110 RA1 rate adaptation. There is one for each supported tuple + * of user data rate and intermediate rate (IR). */ +struct osmo_v110_sync_ra1 { + unsigned int data_rate; + unsigned int intermediate_rate; + unsigned int user_data_chunk_bits; + /*! RA1 function in user bitrate -> intermediate rate direction */ + int (*adapt_user_to_ir)(struct osmo_v110_decoded_frame *fr, const ubit_t *d_in, size_t in_len); + /*! RA1 function in intermediate rate -> user bitrate direction */ + int (*adapt_ir_to_user)(ubit_t *d_out, size_t out_len, const struct osmo_v110_decoded_frame *fr); +}; + +/* all of the synchronous data signalling rates; see Table 1/V.110 */ +static const struct osmo_v110_sync_ra1 osmo_v110_sync_ra1_def[_NUM_OSMO_V110_SYNC_RA1] = { + [OSMO_V110_SYNC_RA1_600] = { + .data_rate = 600, + .intermediate_rate = 8000, + .user_data_chunk_bits = 6, + .adapt_user_to_ir = v110_adapt_600_to_IR8000, + .adapt_ir_to_user = v110_adapt_IR8000_to_600, + }, + [OSMO_V110_SYNC_RA1_1200] = { + .data_rate = 1200, + .intermediate_rate = 8000, + .user_data_chunk_bits = 12, + .adapt_user_to_ir = v110_adapt_1200_to_IR8000, + .adapt_ir_to_user = v110_adapt_IR8000_to_1200, + }, + [OSMO_V110_SYNC_RA1_2400] = { + .data_rate = 2400, + .intermediate_rate = 8000, + .user_data_chunk_bits = 24, + .adapt_user_to_ir = v110_adapt_2400_to_IR8000, + .adapt_ir_to_user = v110_adapt_IR8000_to_2400, + }, + [OSMO_V110_SYNC_RA1_4800] = { + .data_rate = 4800, + .intermediate_rate = 8000, + .user_data_chunk_bits = 48, + .adapt_user_to_ir = v110_adapt_Nx4800_to_IR, + .adapt_ir_to_user = v110_adapt_IR_to_Nx4800, + }, + [OSMO_V110_SYNC_RA1_7200] = { + .data_rate = 7200, + .intermediate_rate = 16000, + .user_data_chunk_bits = 36, + .adapt_user_to_ir = v110_adapt_Nx3600_to_IR, + .adapt_ir_to_user = v110_adapt_IR_to_Nx3600, + }, + [OSMO_V110_SYNC_RA1_9600] = { + .data_rate = 9600, + .intermediate_rate = 16000, + .user_data_chunk_bits = 48, + .adapt_user_to_ir = v110_adapt_Nx4800_to_IR, + .adapt_ir_to_user = v110_adapt_IR_to_Nx4800, + }, + [OSMO_V110_SYNC_RA1_12000] = { + .data_rate = 12000, + .intermediate_rate = 32000, + .user_data_chunk_bits = 30, + .adapt_user_to_ir = v110_adapt_Nx12000_to_IR, + .adapt_ir_to_user = v110_adapt_IR_to_Nx12000, + }, + [OSMO_V110_SYNC_RA1_14400] = { + .data_rate = 14400, + .intermediate_rate = 32000, + .user_data_chunk_bits = 36, + .adapt_user_to_ir = v110_adapt_Nx3600_to_IR, + .adapt_ir_to_user = v110_adapt_IR_to_Nx3600, + }, + [OSMO_V110_SYNC_RA1_19200] = { + .data_rate = 19200, + .intermediate_rate = 32000, + .user_data_chunk_bits = 48, + .adapt_user_to_ir = v110_adapt_Nx4800_to_IR, + .adapt_ir_to_user = v110_adapt_IR_to_Nx4800, + }, + [OSMO_V110_SYNC_RA1_24000] = { + .data_rate = 24000, + .intermediate_rate = 64000, + .user_data_chunk_bits = 30, + .adapt_user_to_ir = v110_adapt_Nx12000_to_IR, + .adapt_ir_to_user = v110_adapt_IR_to_Nx12000, + }, + [OSMO_V110_SYNC_RA1_28800] = { + .data_rate = 28800, + .intermediate_rate = 64000, + .user_data_chunk_bits = 36, + .adapt_user_to_ir = v110_adapt_Nx3600_to_IR, + .adapt_ir_to_user = v110_adapt_IR_to_Nx3600, + }, + [OSMO_V110_SYNC_RA1_38400] = { + .data_rate = 38400, + .intermediate_rate = 64000, + .user_data_chunk_bits = 48, + .adapt_user_to_ir = v110_adapt_Nx4800_to_IR, + .adapt_ir_to_user = v110_adapt_IR_to_Nx4800, + }, +}; + +/*! obtain the size (in number of bits) of the user data bits in one V.110 + * frame for specified RA1 rate */ +int osmo_v110_sync_ra1_get_user_data_chunk_bitlen(enum osmo_v100_sync_ra1_rate rate) +{ + if (rate < 0 || rate >= _NUM_OSMO_V110_SYNC_RA1) + return -EINVAL; + + return osmo_v110_sync_ra1_def[rate].user_data_chunk_bits; +} + +/*! obtain the user data rate (in bits/s) for specified RA1 rate */ +int osmo_v110_sync_ra1_get_user_data_rate(enum osmo_v100_sync_ra1_rate rate) +{ + if (rate < 0 || rate >= _NUM_OSMO_V110_SYNC_RA1) + return -EINVAL; + + return osmo_v110_sync_ra1_def[rate].data_rate; +} + +/*! obtain the intermediate rate (in bits/s) for specified RA1 rate */ +int osmo_v110_sync_ra1_get_intermediate_rate(enum osmo_v100_sync_ra1_rate rate) +{ + if (rate < 0 || rate >= _NUM_OSMO_V110_SYNC_RA1) + return -EINVAL; + + return osmo_v110_sync_ra1_def[rate].intermediate_rate; +} + +/*! perform V.110 RA1 function in user rate -> intermediate rate direction. + * \param[in] rate specification of the user bitrate + * \param[out] fr caller-allocated output buffer for the [decoded] V.110 frame generated + * \param[in] d_in input user data (unpacked bits) + * \param[in] in_len length of user input data (in number of bits) + * \returns 0 on success; negative in case of error */ +int osmo_v110_sync_ra1_user_to_ir(enum osmo_v100_sync_ra1_rate rate, struct osmo_v110_decoded_frame *fr, + const ubit_t *d_in, size_t in_len) +{ + if (rate < 0 || rate >= _NUM_OSMO_V110_SYNC_RA1) + return -EINVAL; + + return osmo_v110_sync_ra1_def[rate].adapt_user_to_ir(fr, d_in, in_len); +} + +/*! perform V.110 RA1 function in intermediate rate -> user rate direction. + * \param[in] rate specification of the user bitrate + * \param[out] d_out caller-allocated output user data (unpacked bits) + * \param[out] out_len length of d_out output buffer + * \param[in] fr [decoded] V.110 frame used as input + * \returns number of unpacked bits written to d_out on success; negative in case of error */ +int osmo_v110_sync_ra1_ir_to_user(enum osmo_v100_sync_ra1_rate rate, ubit_t *d_out, size_t out_len, + const struct osmo_v110_decoded_frame *fr) +{ + if (rate < 0 || rate >= _NUM_OSMO_V110_SYNC_RA1) + return -EINVAL; + + return osmo_v110_sync_ra1_def[rate].adapt_ir_to_user(d_out, out_len, fr); +} |