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libosmocore/src/isdn/v110.c

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/* 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);
}
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