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Add new TRAU frame sync code 

This code is able to detect and sync against a variety of TRAU
frame sync patterns.  Focus is so far on those patterns present on
16k sub-slots, but 8k sub-slots are expected to be supported soon,
too.

A new codebase for this is required as the old OsmoNITB code had
conflated a 16k sub-slot multiplexer with TRAU frame synchronization,
so there was no way to separate those two parts and hence no way to
support 8k sub-slots.

Change-Id: Ia6fe6228b0b8b9a27999f37ce1115ed5558881ea
This commit is contained in:
Harald Welte 2020-05-14 13:28:07 +02:00
parent 95e2dfbc83
commit 78861c0aef
10 changed files with 712 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/Makefile.am
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@ -5,4 +5,5 @@ nobase_include_HEADERS = osmocom/abis/ipa.h osmocom/abis/trau_frame.h \
osmocom/abis/subchan_demux.h osmocom/abis/e1_input.h \
osmocom/abis/lapd.h osmocom/abis/lapd_pcap.h osmocom/trau/osmo_ortp.h \
osmocom/abis/unixsocket_proto.h \
osmocom/trau/trau_frame.h
osmocom/trau/trau_frame.h \
osmocom/trau/trau_sync.h

19
include/osmocom/trau/trau_sync.h Normal file
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@ -0,0 +1,19 @@
#pragma once
#include <osmocom/core/bits.h>
#include <osmocom/core/fsm.h>
enum osmo_tray_sync_pat_id {
OSMO_TRAU_SYNCP_16_FR_EFR,
OSMO_TRAU_SYNCP_8_HR,
OSMO_TRAU_SYNCP_8_AMR_LOW,
OSMO_TRAU_SYNCP_8_AMR_6K7,
OSMO_TRAU_SYNCP_8_AMR_7K4,
};
typedef void (*frame_out_cb_t)(void *user_data, const ubit_t *bits, unsigned int num_bits);
struct osmo_fsm_inst *
osmo_trau_sync_alloc(void *ctx, const char *name, frame_out_cb_t frame_out_cb,
enum osmo_tray_sync_pat_id pat_id, void *user_data);
void osmo_trau_sync_rx_ubits(struct osmo_fsm_inst *fi, const ubit_t *bits, size_t n_bits);

5
src/Makefile.am
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@ -36,4 +36,7 @@ libosmotrau_la_CFLAGS = $(AM_CFLAGS) $(ORTP_CFLAGS)
libosmotrau_la_LDFLAGS = $(AM_LDFLAGS) -version-info $(TRAU_LIBVERSION)
libosmotrau_la_LIBADD = $(COMMONLIBS) $(ORTP_LIBS)
libosmotrau_la_SOURCES = trau/osmo_ortp.c \
trau/trau_frame.c
trau/trau_frame.c \
trau/trau_sync.c
noinst_HEADERS = trau/ubit_buf.h

522
src/trau/trau_sync.c Normal file
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@ -0,0 +1,522 @@
/* GSM A-bis TRAU frame synchronization as per TS 48.060 / 48.061 */
/* (C) 2020 by Harald Welte <laforge@gnumonks.org>
* All Rights Reserved
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdint.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/bits.h>
#include <osmocom/core/fsm.h>
#include "ubit_buf.h"
#include <osmocom/trau/trau_sync.h>
#define S(x) (1 << (x))
#define MAX_TRAU_BYTES 40
#define T_SYNC 1
struct sync_pattern {
/* provided by user */
const char *name; /*!< human-readable name */
const uint8_t byte_pattern[MAX_TRAU_BYTES]; /*!< bytes to match against */
const uint8_t byte_mask[MAX_TRAU_BYTES]; /*!< mask applied before matching */
uint8_t byte_len; /*!< length of mask in bytes */
/* generated by code */
ubit_t ubit_pattern[MAX_TRAU_BYTES*8]; /*!< bits to match against */
ubit_t ubit_mask[MAX_TRAU_BYTES*8]; /*!< mask applied before matching */
uint8_t bitcount; /*!< number of high bits in mask */
};
static struct sync_pattern sync_patterns[] = {
[OSMO_TRAU_SYNCP_16_FR_EFR] = {
/* TS 08.60 Section 4.8.1 */
.name = "FR/EFR",
.byte_pattern = {
0x00, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
},
.byte_mask = {
0xff, 0xff, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
},
.byte_len = 40,
},
[OSMO_TRAU_SYNCP_8_HR] = {
/* TS 08.61 Section 6.8.2.1.1 */
.name = "HR8",
.byte_pattern = {
0x00, 0x80, 0x40, 0x80,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
},
.byte_mask = {
0xff, 0x80, 0xC0, 0x80,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
},
.byte_len = 20,
},
[OSMO_TRAU_SYNCP_8_AMR_LOW] = {
/* TS 08.61 Section 6.8.2.1.2 */
/* The frame synchronisation for No_Speech frames and the speech frames of the three lower codec modes */
.name = "AMR8_LOW",
.byte_pattern = {
0x00, 0x80, 0x80, 0x40,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
},
.byte_mask = {
0xff, 0x80, 0x80, 0xC0,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x80,
},
.byte_len = 20,
},
[OSMO_TRAU_SYNCP_8_AMR_6K7] = {
/* The frame synchronisation for the speech frames for codec mode 6,70 kBit/s */
.name = "AMR8_67",
.byte_pattern = {
0x00, 0x80, 0x80, 0x80,
0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00,
},
.byte_mask = {
0xff, 0x80, 0x80, 0x80,
0x80, 0x80, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00,
},
.byte_len = 20
},
[OSMO_TRAU_SYNCP_8_AMR_7K4] = {
/* The frame synchronisation for the speech frames for codec mode 7,40 kBit/s */
.name = "AMR8_74",
.byte_pattern = {
0x20, 0x00, 0x80, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
},
.byte_mask = {
0xe0, 0x80, 0x80, 0x80,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
},
.byte_len = 20,
},
};
#if 0
static struct sync_pattern rbs_ccu_sync_ind_16_pattern = {
.name ="RBS_CCU_SYNC_IND_16",
.byte_pattern = {
0x00, 0x00, 0x01, 0x00,
0x00, 0x00, 0x01, 0x00,
0x01, 0x00, 0x01, 0x00,
},
.byte_mask = {
0xff, 0xff, 0x01, 0x00,
0x01, 0x00, 0x01, 0x00,
0x01, 0x00, 0x01, 0x00,
},
};
static struct sync_pattern rbs_ccu_data_ind_16_pattern = {
.name ="RBS_CCU_DATA_IND_16",
.byte_pattern = {
0x00, 0x00, 0x01, 0x00,
},
.byte_mask = {
0xff, 0xff, 0x01, 0x00,
},
};
#endif
static void expand_sync_pattern(struct sync_pattern *pat)
{
osmo_pbit2ubit(pat->ubit_pattern, pat->byte_pattern, pat->byte_len*8);
osmo_pbit2ubit(pat->ubit_mask, pat->byte_mask, pat->byte_len*8);
}
static unsigned int count_one_bits(const ubit_t *in, unsigned int in_bits)
{
unsigned int i, count = 0;
for (i = 0; i < in_bits; i++) {
if (in[i])
count++;
}
return count;
}
static void sync_pattern_register(struct sync_pattern *p)
{
expand_sync_pattern(p);
p->bitcount = count_one_bits(p->ubit_mask, p->byte_len*8);
}
#if 0
/*! correlate pattern with unpacked bits from buffer.
* \param[in] pattern sync_pattern against which we shall compare
* \param[in] bits unpacked bits to compare against pattern
* \param[in] num_bits number of unpacked bits
* \returns number of bits not matching pattern; -1 if insufficient bits available. */
static int correlate_pattern_ubits(const struct sync_pattern *pattern,
const ubit_t *bits, size_t num_bits)
{
int i, num_wrong = 0;
if (num_bits < pattern->byte_len*8)
return -1; /* insufficient data */
for (i = 0; i < pattern->byte_len *8; i++) {
/* if mask doesn't contain '1', we can skip this octet */
if (!pattern->ubit_mask)
continue;
if (bits[i] != pattern->ubit_pattern[i])
num_wrong++;
}
return num_wrong;
}
#endif
struct trau_rx_sync_state {
/*! call-back to be called for every TRAU frame (called with
* bits=NULL in case of frame sync loss */
frame_out_cb_t out_cb;
/*! opaque user data; passed to out_cb */
void *user_data;
/*! history of received bits */
ubit_t history[MAX_TRAU_BYTES*8+1]; /* +1 not required, but helps to expose bugs */
/*! index of next-to-be-written ubit in history */
unsigned int history_idx;
/*! the pattern we are trying to sync to */
const struct sync_pattern *pattern;
/*! number of consecutive frames without sync */
unsigned int num_consecutive_errors;
};
/* correlate the history (up to the last received bit) against the pattern */
static int correlate_history_against_pattern(struct trau_rx_sync_state *tss)
{
const struct sync_pattern *pattern = tss->pattern;
int i, start, num_wrong = 0;
/* compute index of first bit in history array */
start = (ARRAY_SIZE(tss->history) + tss->history_idx - pattern->byte_len*8)
% ARRAY_SIZE(tss->history);
OSMO_ASSERT(ARRAY_SIZE(tss->history) >= pattern->byte_len*8);
for (i = 0; i < pattern->byte_len*8; i++) {
unsigned int pos = (start + i) % ARRAY_SIZE(tss->history);
/* if mask doesn't contain '1', we can skip this octet */
if (!pattern->ubit_mask[i])
continue;
if (tss->history[pos] != pattern->ubit_pattern[i])
num_wrong++;
}
return num_wrong;
}
/* add (append) one ubit to the history; wrap as needed */
static void rx_history_add_bit(struct trau_rx_sync_state *tss, ubit_t bit)
{
tss->history[tss->history_idx] = bit;
/* simply wrap around at the end */
tss->history_idx = (tss->history_idx + 1) % ARRAY_SIZE(tss->history);
}
/* append bits to history. We assume that this does NOT wrap */
static void rx_history_add_bits(struct trau_rx_sync_state *tss, const ubit_t *bits, size_t n_bits)
{
unsigned int frame_bits_remaining = tss->pattern->byte_len*8 - tss->history_idx;
OSMO_ASSERT(frame_bits_remaining >= n_bits);
memcpy(&tss->history[tss->history_idx], bits, n_bits);
tss->history_idx = tss->history_idx + n_bits;
}
/* align the history, i.e. next received bit is start of frame */
static void rx_history_align(struct trau_rx_sync_state *tss)
{
ubit_t tmp[sizeof(tss->history)];
size_t history_size = sizeof(tss->history);
size_t pattern_bits = tss->pattern->byte_len*8;
size_t first_bit = (history_size + tss->history_idx - pattern_bits) % history_size;
int i;
/* we need to shift the last received frame to the start of the history buffer;
* do this in two steps: First copy to a local buffer on the stack, using modulo-arithmetic
* as index into the history. Second, copy it back to history */
for (i = 0; i < pattern_bits; i++)
tmp[i] = tss->history[(first_bit + i) % history_size];
memcpy(tss->history, tmp, history_size);
tss->history_idx = 0;
}
enum trau_sync_state {
WAIT_FRAME_ALIGN,
FRAME_ALIGNED,
/* if at least 3 consecutive frames with each at least one framing error have been received */
FRAME_ALIGNMENT_LOST,
};
enum trau_sync_event {
TRAUSYNC_E_RESET,
/*! a buffer of bits was received (msgb with ubits) */
TRAUSYNC_E_RX_BITS,
};
static const struct value_string trau_sync_event_names[] = {
{ TRAUSYNC_E_RESET, "RESET" },
{ TRAUSYNC_E_RX_BITS, "RX_BITS" },
{ 0, NULL }
};
static void trau_sync_wait_align(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct trau_rx_sync_state *tss = (struct trau_rx_sync_state *) fi->priv;
struct ubit_buf *ubb;
switch (event) {
case TRAUSYNC_E_RX_BITS:
ubb = data;
/* append every bit individually + check if we have sync */
while (ubb_length(ubb) > 0) {
ubit_t bit = ubb_pull_ubit(ubb);
int rc;
rx_history_add_bit(tss, bit);
rc = correlate_history_against_pattern(tss);
if (!rc) {
osmo_fsm_inst_state_chg(fi, FRAME_ALIGNED, 0, 0);
/* treat remainder of input bits in correct state */
osmo_fsm_inst_dispatch(fi, TRAUSYNC_E_RX_BITS, ubb);
return;
}
}
break;
default:
OSMO_ASSERT(0);
}
}
static void trau_sync_aligned_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
struct trau_rx_sync_state *tss = (struct trau_rx_sync_state *) fi->priv;
/* dispatch aligned frame to user */
rx_history_align(tss);
tss->out_cb(tss->user_data, tss->history, tss->pattern->byte_len*8);
}
static void trau_sync_aligned(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
struct trau_rx_sync_state *tss = (struct trau_rx_sync_state *) fi->priv;
struct ubit_buf *ubb;
int rc;
switch (event) {
case TRAUSYNC_E_RX_BITS:
ubb = data;
while (ubb_length(ubb)) {
unsigned int frame_bits_remaining = tss->pattern->byte_len*8 - tss->history_idx;
if (ubb_length(ubb) < frame_bits_remaining) {
/* frame not filled by this message; just add data */
rx_history_add_bits(tss, ubb_data(ubb), ubb_length(ubb));
ubb_pull(ubb, ubb_length(ubb));
} else {
/* append as many bits as are missing in the current frame */
rx_history_add_bits(tss, ubb_data(ubb), frame_bits_remaining);
ubb_pull(ubb, frame_bits_remaining);
/* check if we still have frame sync */
rc = correlate_history_against_pattern(tss);
if (rc > 0) {
tss->num_consecutive_errors++;
if (tss->num_consecutive_errors >= 3) {
tss->history_idx = 0;
/* send NULL frame to user */
tss->out_cb(tss->user_data, NULL, 0);
osmo_fsm_inst_state_chg(fi, FRAME_ALIGNMENT_LOST, 1, T_SYNC);
osmo_fsm_inst_dispatch(fi, TRAUSYNC_E_RX_BITS, ubb);
return;
}
} else
tss->num_consecutive_errors = 0;
/* dispatch aligned frame to user */
tss->out_cb(tss->user_data, tss->history, tss->history_idx);
tss->history_idx = 0;
}
}
break;
default:
OSMO_ASSERT(0);
}
}
static void trau_sync_alignment_lost(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
/* we try to restore sync for some amount of time before generating an error */
switch (event) {
case TRAUSYNC_E_RX_BITS:
trau_sync_wait_align(fi, event, data);
break;
default:
OSMO_ASSERT(0);
}
}
static void trau_sync_allstate(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch (event) {
case TRAUSYNC_E_RESET:
osmo_fsm_inst_state_chg(fi, WAIT_FRAME_ALIGN, 0, 0);
break;
default:
OSMO_ASSERT(0);
}
}
static int trau_sync_timeout(struct osmo_fsm_inst *fi)
{
switch (fi->T) {
case T_SYNC:
/* if Tsync expires before frame synchronization is
* again obtained the TRAU initiates sending of the
* urgent alarm pattern described in clause 4.10.2. */
osmo_fsm_inst_state_chg(fi, WAIT_FRAME_ALIGN, 0, 0);
break;
default:
OSMO_ASSERT(0);
}
return 0;
}
static const struct osmo_fsm_state trau_sync_states[] = {
[WAIT_FRAME_ALIGN] = {
.name = "WAIT_FRAME_ALIGN",
.in_event_mask = S(TRAUSYNC_E_RX_BITS),
.out_state_mask = S(FRAME_ALIGNED),
.action = trau_sync_wait_align,
},
[FRAME_ALIGNED] = {
.name = "FRAME_ALIGNED",
.in_event_mask = S(TRAUSYNC_E_RX_BITS),
.out_state_mask = S(FRAME_ALIGNMENT_LOST) | S(WAIT_FRAME_ALIGN),
.action = trau_sync_aligned,
.onenter = trau_sync_aligned_onenter,
},
[FRAME_ALIGNMENT_LOST] = {
.name = "FRAME_ALIGNMENT_LOST",
.in_event_mask = S(TRAUSYNC_E_RX_BITS),
.out_state_mask = S(WAIT_FRAME_ALIGN) | S(FRAME_ALIGNED),
.action = trau_sync_alignment_lost,
},
};
static struct osmo_fsm trau_sync_fsm = {
.name = "trau_sync",
.states = trau_sync_states,
.num_states = ARRAY_SIZE(trau_sync_states),
.allstate_event_mask = S(TRAUSYNC_E_RESET),
.allstate_action = trau_sync_allstate,
.timer_cb = trau_sync_timeout,
.log_subsys = DLGLOBAL,
.event_names = trau_sync_event_names,
};
struct osmo_fsm_inst *
osmo_trau_sync_alloc(void *ctx, const char *name, frame_out_cb_t frame_out_cb,
enum osmo_tray_sync_pat_id pat_id, void *user_data)
{
struct trau_rx_sync_state *tss;
struct osmo_fsm_inst *fi;
if (pat_id >= ARRAY_SIZE(sync_patterns))
return NULL;
fi = osmo_fsm_inst_alloc(&trau_sync_fsm, ctx, NULL, LOGL_NOTICE, name);
if (!fi)
return NULL;
tss = talloc_zero(fi, struct trau_rx_sync_state);
if (!tss) {
osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL);
return NULL;
}
fi->priv = tss;
tss->out_cb = frame_out_cb;
tss->user_data = user_data;
/* FIXME: this must be configurable */
tss->pattern = &sync_patterns[pat_id];
return fi;
}
void osmo_trau_sync_rx_ubits(struct osmo_fsm_inst *fi, const ubit_t *bits, size_t n_bits)
{
struct ubit_buf ubb;
ubb_init(&ubb, bits, n_bits);
osmo_fsm_inst_dispatch(fi, TRAUSYNC_E_RX_BITS, &ubb);
}
static void __attribute__((constructor)) on_dso_load_sync(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(sync_patterns); i++)
sync_pattern_register(&sync_patterns[i]);
osmo_fsm_register(&trau_sync_fsm);
}

42
src/trau/ubit_buf.h Normal file
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@ -0,0 +1,42 @@
#pragma once
#include <osmocom/core/bits.h>
/* Small helper inspired by msgb */
struct ubit_buf {
const ubit_t *buf; /*!< start of underlying buffer */
const ubit_t *data; /*!< next to be consumed bit */
size_t n_bits; /*!< number of total bits iin buffer */
};
/*! length of [remainig, to be processed] data in ubit_buf */
static inline size_t ubb_length(struct ubit_buf *ubb)
{
return ubb->n_bits - (ubb->data - ubb->buf);
}
/*! retrieve + remove a single ubit_t from start of ubit_buf */
static inline ubit_t ubb_pull_ubit(struct ubit_buf *ubb)
{
OSMO_ASSERT(ubb->data < ubb->buf + ubb->n_bits);
return *ubb->data++;
}
static inline void ubb_pull(struct ubit_buf *ubb, size_t count)
{
OSMO_ASSERT(ubb_length(ubb) >= count);
ubb->data += count;
}
/*! get pointer to next to be consumed bit */
static inline const ubit_t *ubb_data(struct ubit_buf *ubb)
{
return ubb->data;
}
static inline void ubb_init(struct ubit_buf *ubb, const ubit_t *bits, size_t n_bits)
{
ubb->buf = bits;
ubb->data = ubb->buf;
ubb->n_bits = n_bits;
}

10
tests/Makefile.am
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@ -7,7 +7,8 @@ check_PROGRAMS = e1inp_ipa_bsc_test \
ipa_proxy_test \
subchan_demux/subchan_demux_test \
ipa_recv/ipa_recv_test \
rtp_test/rtp_test
rtp_test/rtp_test \
trau_sync/trau_sync_test
e1inp_ipa_bsc_test_SOURCES = e1inp_ipa_bsc_test.c
e1inp_ipa_bsc_test_LDADD = $(top_builddir)/src/libosmoabis.la \
@ -36,6 +37,10 @@ rtp_test_rtp_test_SOURCES = rtp_test/rtp_test.c
rtp_test_rtp_test_LDADD = $(top_builddir)/src/libosmotrau.la \
$(LIBOSMOCORE_LIBS)
trau_sync_trau_sync_test_SOURCES = trau_sync/trau_sync_test.c
trau_sync_trau_sync_test_LDADD = $(top_builddir)/src/libosmotrau.la \
$(LIBOSMOCORE_LIBS)
# boilerplate for the tests
# The `:;' works around a Bash 3.2 bug when the output is not writeable.
@ -59,7 +64,8 @@ $(srcdir)/package.m4: $(top_srcdir)/configure.ac
EXTRA_DIST = testsuite.at $(srcdir)/package.m4 $(TESTSUITE) \
subchan_demux/subchan_demux_test.ok \
ipa_recv/ipa_recv_test.ok \
rtp_test/rtp_test.ok
rtp_test/rtp_test.ok \
trau_sync/trau_sync_test.ok trau_sync/trau_sync_test.err
TESTSUITE = $(srcdir)/testsuite

6
tests/testsuite.at
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@ -29,3 +29,9 @@ cat $abs_srcdir/rtp_test/rtp_test.ok > expout
AT_CHECK([$abs_top_builddir/tests/rtp_test/rtp_test], [ignore], [expout])
AT_CLEANUP
AT_SETUP([trau_sync])
AT_KEYWORDS([trau_sync])
cat $abs_srcdir/trau_sync/trau_sync_test.ok > expout
cat $abs_srcdir/trau_sync/trau_sync_test.err > experr
AT_CHECK([$abs_top_builddir/tests/trau_sync/trau_sync_test], [0], [expout], [experr])
AT_CLEANUP

85
tests/trau_sync/trau_sync_test.c Normal file
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@ -0,0 +1,85 @@
#include <osmocom/core/application.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/bits.h>
#include <osmocom/trau/trau_sync.h>
static void frame_out_cb(void *user_data, const ubit_t *bits, unsigned int num_bits)
{
char *str = user_data;
printf("demux_bits_cb '%s': %s\n", str, osmo_ubit_dump(bits, num_bits));
}
static const uint8_t sync_pattern[] = {
0x00, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
0x80, 0x00, 0x80, 0x00, 0x80, 0x00, 0x80, 0x00,
};
#define ASSERT_STATE(fi, x) OSMO_ASSERT(!strcmp(osmo_fsm_inst_state_name(fi), x))
static void test_body(void)
{
struct osmo_fsm_inst *fi = osmo_trau_sync_alloc(NULL, "test", frame_out_cb, OSMO_TRAU_SYNCP_16_FR_EFR, "test");
OSMO_ASSERT(fi);
printf("\n==> %s\n", __func__);
ubit_t bits[40*8];
/* send some invalid data */
memset(bits, 0, sizeof(bits));
osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
osmo_trau_sync_rx_ubits(fi, bits, 23);
/* first valid frame */
osmo_pbit2ubit(bits, sync_pattern, sizeof(sync_pattern)*8);
osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
ASSERT_STATE(fi, "FRAME_ALIGNED");
/* second valid frame */
osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
ASSERT_STATE(fi, "FRAME_ALIGNED");
/* send wrong frame */
memset(bits, 1, sizeof(bits));
osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
ASSERT_STATE(fi, "FRAME_ALIGNED");
/* intersperse a valid frame */
osmo_pbit2ubit(bits, sync_pattern, sizeof(sync_pattern)*8);
osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
/* second wrong frame - but not consecutive */
memset(bits, 1, sizeof(bits));
osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
ASSERT_STATE(fi, "FRAME_ALIGNED");
/* third wrong frame - second consecutive */
osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
ASSERT_STATE(fi, "FRAME_ALIGNED");
/* only from third consecutive invalid frame onwards we should loose alignment */
osmo_trau_sync_rx_ubits(fi, bits, sizeof(bits));
ASSERT_STATE(fi, "FRAME_ALIGNMENT_LOST");
}
static const struct log_info_cat default_categories[] = {
};
const struct log_info log_info = {
.cat = default_categories,
.num_cat = ARRAY_SIZE(default_categories),
};
int main(int argc, char **argv)
{
osmo_init_logging2(NULL, NULL);
osmo_fsm_log_addr(false);
log_set_print_filename2(osmo_stderr_target, LOG_FILENAME_NONE);
test_body();
}

15
tests/trau_sync/trau_sync_test.err Normal file
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@ -0,0 +1,15 @@
<0000> trau_sync(test){WAIT_FRAME_ALIGN}: Allocated
<0000> trau_sync(test){WAIT_FRAME_ALIGN}: Received Event RX_BITS
<0000> trau_sync(test){WAIT_FRAME_ALIGN}: Received Event RX_BITS
<0000> trau_sync(test){WAIT_FRAME_ALIGN}: Received Event RX_BITS
<0000> trau_sync(test){WAIT_FRAME_ALIGN}: state_chg to FRAME_ALIGNED
<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
<0000> trau_sync(test){FRAME_ALIGNED}: Received Event RX_BITS
<0000> trau_sync(test){FRAME_ALIGNED}: state_chg to FRAME_ALIGNMENT_LOST
<0000> trau_sync(test){FRAME_ALIGNMENT_LOST}: Received Event RX_BITS


9
tests/trau_sync/trau_sync_test.ok Normal file
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@ -0,0 +1,9 @@
==> test_body
demux_bits_cb 'test': 00000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000
demux_bits_cb 'test': 00000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000
demux_bits_cb 'test': 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
demux_bits_cb 'test': 00000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000100000000000000010000000000000001000000000000000
demux_bits_cb 'test': 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
demux_bits_cb 'test': 11111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111
demux_bits_cb 'test':