diff options
| -rw-r--r-- | TODO-RELEASE | 1 | ||||
| -rw-r--r-- | include/Makefile.am | 1 | ||||
| -rw-r--r-- | include/osmocom/codec/ecu.h | 15 | ||||
| -rw-r--r-- | src/codec/Makefile.am | 2 | ||||
| -rw-r--r-- | src/codec/ecu_fr.c | 165 | ||||
| -rw-r--r-- | tests/Makefile.am | 10 | ||||
| -rw-r--r-- | tests/codec/codec_ecu_fr_test.c | 146 | ||||
| -rw-r--r-- | tests/codec/codec_ecu_fr_test.ok | 192 | ||||
| -rw-r--r-- | tests/testsuite.at | 6 |
9 files changed, 535 insertions, 3 deletions
diff --git a/TODO-RELEASE b/TODO-RELEASE index a5def797..782ba199 100644 --- a/TODO-RELEASE +++ b/TODO-RELEASE @@ -9,3 +9,4 @@ #library what description / commit summary line core msgb_queue_free() add inline func to msgb.h coding gsm0503_rach_ext-encode() add func to gsm0503_coding.h +codec ecu.c / ecu.h implement ECU for FR (Error Concealment Unit) diff --git a/include/Makefile.am b/include/Makefile.am index 09f5ca65..f95d90c7 100644 --- a/include/Makefile.am +++ b/include/Makefile.am @@ -1,6 +1,7 @@ BUILT_SOURCES = osmocom/gsm/gsm0503.h nobase_include_HEADERS = \ + osmocom/codec/ecu.h \ osmocom/codec/codec.h \ osmocom/codec/gsm610_bits.h \ osmocom/core/application.h \ diff --git a/include/osmocom/codec/ecu.h b/include/osmocom/codec/ecu.h new file mode 100644 index 00000000..f7a29a00 --- /dev/null +++ b/include/osmocom/codec/ecu.h @@ -0,0 +1,15 @@ +#pragma once + +#include <stdint.h> +#include <stdbool.h> + +#include <osmocom/codec/codec.h> + +/* Codec independent ECU state */ +struct osmo_ecu_fr_state { + bool subsequent_lost_frame; + uint8_t frame_backup[GSM_FR_BYTES]; +}; + +void osmo_ecu_fr_reset(struct osmo_ecu_fr_state *state, uint8_t *frame); +int osmo_ecu_fr_conceal(struct osmo_ecu_fr_state *state, uint8_t *frame); diff --git a/src/codec/Makefile.am b/src/codec/Makefile.am index b4df5da7..f77d910b 100644 --- a/src/codec/Makefile.am +++ b/src/codec/Makefile.am @@ -13,6 +13,6 @@ endif lib_LTLIBRARIES = libosmocodec.la -libosmocodec_la_SOURCES = gsm610.c gsm620.c gsm660.c gsm690.c +libosmocodec_la_SOURCES = gsm610.c gsm620.c gsm660.c gsm690.c ecu_fr.c libosmocodec_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined libosmocodec_la_LIBADD = $(top_builddir)/src/libosmocore.la diff --git a/src/codec/ecu_fr.c b/src/codec/ecu_fr.c new file mode 100644 index 00000000..d4ea741b --- /dev/null +++ b/src/codec/ecu_fr.c @@ -0,0 +1,165 @@ +/* + * (C) 2017 by sysmocom - s.f.m.c. GmbH + * (C) 2017 by Philipp Maier <pmaier@sysmocom.de> + * + * All Rights Reserved + * + * 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, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + * + */ + +#include <stdbool.h> +#include <string.h> +#include <stdint.h> +#include <errno.h> + +#include <osmocom/core/bitvec.h> + +#include <osmocom/codec/gsm610_bits.h> +#include <osmocom/codec/codec.h> +#include <osmocom/codec/ecu.h> + +/* See also GSM 06.11, chapter 6 Example solution */ +#define GSM610_XMAXC_REDUCE 4 +#define GSM610_XMAXC_LEN 6 + +/** + * Reduce the XMAXC field. When the XMAXC field reaches + * zero the function will return true. + */ +static bool reduce_xmaxcr(struct bitvec *frame_bitvec, + const unsigned int index) +{ + unsigned int field_index; + uint64_t field; + + field_index = index; + field = bitvec_read_field(frame_bitvec, &field_index, GSM610_XMAXC_LEN); + if (field > GSM610_XMAXC_REDUCE) + field -= GSM610_XMAXC_REDUCE; + else + field = 0; + + field_index = index; + bitvec_write_field(frame_bitvec, &field_index, field, GSM610_XMAXC_LEN); + + return field == 0; +} + +/** + * Reduce all XMAXC fields in the frame. When all XMAXC fields + * reach zero, then the function will return true. + */ +static bool reduce_xmaxcr_all(struct bitvec *frame_bitvec) +{ + bool silent = false; + + if (reduce_xmaxcr(frame_bitvec, GSM610_RTP_XMAXC00)) + silent = true; + if (reduce_xmaxcr(frame_bitvec, GSM610_RTP_XMAXC10)) + silent = true; + if (reduce_xmaxcr(frame_bitvec, GSM610_RTP_XMAXC20)) + silent = true; + if (reduce_xmaxcr(frame_bitvec, GSM610_RTP_XMAXC30)) + silent = true; + + return silent; +} + +/* Use certain modifications to conceal the errors in a full rate frame */ +static int conceal_frame(uint8_t *frame) +{ + struct bitvec *frame_bitvec; + unsigned int len; + bool silent; + int rc = 0; + + /* In case we already deal with a silent frame, + * there is nothing to, we just abort immediately */ + if (osmo_fr_check_sid(frame, GSM_FR_BYTES)) + return 0; + + /* Attempt to allocate memory for bitvec */ + frame_bitvec = bitvec_alloc(GSM_FR_BYTES, NULL); + if (!frame_bitvec) + return -ENOMEM; + + /* Convert a frame to bitvec */ + len = bitvec_unpack(frame_bitvec, frame); + if (len != GSM_FR_BYTES) { + rc = -EIO; + goto leave; + } + + /* Fudge frame parameters */ + silent = reduce_xmaxcr_all(frame_bitvec); + + /* If we reached silence level, mute the frame + * completely, this also means that we can + * save the bitvec_pack operation */ + if (silent) { + memset(frame, 0x00, GSM_FR_BYTES); + frame[0] = 0xd0; + goto leave; + } + + /* Convert back to packed byte form */ + len = bitvec_pack(frame_bitvec, frame); + if (len != GSM_FR_BYTES) { + rc = -EIO; + goto leave; + } + +leave: + bitvec_free(frame_bitvec); + return rc; +} + +/** + * To be called when a good frame is received. + * This function will then create a backup of the frame + * and reset the internal state. + */ +void osmo_ecu_fr_reset(struct osmo_ecu_fr_state *state, uint8_t *frame) +{ + state->subsequent_lost_frame = false; + memcpy(state->frame_backup, frame, GSM_FR_BYTES); +} + +/** + * To be called when a bad frame is received. + * This function will then generate a replacement frame + * that can be used to conceal the dropout. + */ +int osmo_ecu_fr_conceal(struct osmo_ecu_fr_state *state, uint8_t *frame) +{ + int rc; + + /* For subsequent frames we run the error concealment + * functions on the backed up frame before we restore + * the backup */ + if (state->subsequent_lost_frame) { + rc = conceal_frame(state->frame_backup); + if (rc) + return rc; + } + + /* Restore the backed up frame and set flag in case + * we receive even more bad frames */ + memcpy(frame, state->frame_backup, GSM_FR_BYTES); + state->subsequent_lost_frame = true; + + return 0; +} diff --git a/tests/Makefile.am b/tests/Makefile.am index 78542b2a..877a302d 100644 --- a/tests/Makefile.am +++ b/tests/Makefile.am @@ -17,7 +17,8 @@ check_PROGRAMS = timer/timer_test sms/sms_test ussd/ussd_test \ write_queue/wqueue_test socket/socket_test \ coding/coding_test conv/conv_gsm0503_test \ abis/abis_test endian/endian_test sercomm/sercomm_test \ - stats/stats_test prbs/prbs_test gsm23003/gsm23003_test + stats/stats_test prbs/prbs_test gsm23003/gsm23003_test \ + codec/codec_ecu_fr_test if ENABLE_MSGFILE check_PROGRAMS += msgfile/msgfile_test @@ -136,6 +137,9 @@ fr_fr_test_LDADD = $(LDADD) $(top_builddir)/src/gb/libosmogb.la $(LIBRARY_DL) \ codec_codec_test_SOURCES = codec/codec_test.c codec_codec_test_LDADD = $(LDADD) $(top_builddir)/src/codec/libosmocodec.la +codec_codec_ecu_fr_test_SOURCES = codec/codec_ecu_fr_test.c +codec_codec_ecu_fr_test_LDADD = $(LDADD) $(top_builddir)/src/codec/libosmocodec.la + loggingrb_loggingrb_test_SOURCES = loggingrb/loggingrb_test.c loggingrb_loggingrb_test_LDADD = $(LDADD) @@ -205,11 +209,13 @@ EXTRA_DIST = testsuite.at $(srcdir)/package.m4 $(TESTSUITE) \ gsm0808/gsm0808_test.ok gb/bssgp_fc_tests.err \ gb/bssgp_fc_tests.ok gb/bssgp_fc_tests.sh \ gb/gprs_bssgp_test.ok gb/gprs_ns_test.ok gea/gea_test.ok \ - gprs/gprs_test.ok kasumi/kasumi_test.ok codec/codec_test.ok \ + gprs/gprs_test.ok kasumi/kasumi_test.ok \ msgfile/msgfile_test.ok msgfile/msgconfig.cfg \ logging/logging_test.ok logging/logging_test.err \ fr/fr_test.ok loggingrb/logging_test.ok \ loggingrb/logging_test.err strrb/strrb_test.ok \ + codec/codec_test.ok \ + codec/codec_ecu_fr_test.ok \ vty/vty_test.ok \ vty/fail_not_de-indented.cfg \ vty/fail_tabs_and_spaces.cfg \ diff --git a/tests/codec/codec_ecu_fr_test.c b/tests/codec/codec_ecu_fr_test.c new file mode 100644 index 00000000..0fdc489d --- /dev/null +++ b/tests/codec/codec_ecu_fr_test.c @@ -0,0 +1,146 @@ +#include <stdio.h> +#include <stdint.h> +#include <string.h> + +#include <osmocom/core/bitvec.h> +#include <osmocom/core/utils.h> + +#include <osmocom/codec/codec.h> +#include <osmocom/codec/ecu.h> + +/* Set with sample full-rate voice frames and some intentional dropouts */ +static const char *fr_frames_hex[] = { + "d9aa93ae63de00471a91b95b8660471392b4a2daa037628f391c624039258dc723", + "d8eb83699a66c036ec89b7246e6034dc8d48948620589b7256e3a6603b2371b8da", + "d967abaa1cbe4035238da6ace4c036d46ec69ba600391c4eb8a2b040591c6a3924", + "d8e8a42662c240472469b91bd2e0452291b6dba600495b8e38dcb020491a71c91b", + "da2aac1ddbb00036e46e26dcec6039138db923822047137248e3560048e38dc8e3", + "d929ab2a9b5240395b6dc72ba020469c8d551c5440349c9148e36a4036a372471b", + "d9eb93215bb8a0271c69c724682036db71c71a94a0372491b72bee4044eb71b923", + "d9ab9aa19abc40391b6e5ae2ee40471b91c6dbe820492291b8e4b84036e47238db", + "d96b9be9db782044e371b55cb200389491c69b8ea034e271c8d3808038ec6db8e3", + "d9aa9365e3f060375c6db6ebc4c02764b1c51b78a0571c91a723de6049248dc8dd", + "BAD", + "d9ea9c219ce60046e38d3724e0c034e56e36eb7e0038d471b8dcb260491b8dbb23", + "d9e89be9d9e0a0391b6dd6a4624029247138e3a2a04713922524de0036db69d91c", + "d9699422a2b6a048dd90c91c6a802b6259395c8880575b4a58e4ac20269d7248d4", + "d967ac5b1baae0371c71b8ab9c804a9e8e58a55a8038626ec8dcb640395c7244dc", + "d9e8a3e262e68027638db52b88a038634e471a7ec049136e3b1bc8402923adcad2", + "d8eab36e1bbe0046e34d491b608035137658d3524044e48e375cdac0472b9238d4", + "d9689ba5e3d260491b516adb5e4027256e27227ee0351c8e549a5c60492471971b", + "BAD", + "BAD", + "d8e6a2e1d3d2605b1376c8d35280392451391cbc80392a71b6db8aa049238dc8ab", + "d9a87ba1a3982048eb8a471cac00472b4e391bbc40292489b71cc200495b8d3ae3", + "d9278b2a1ba4c0475b8dc722d6e0491b5228da70204ae36dc71d94a056a29236e3", + "d9ec9be2129520392335598c50c04b5bad3d4ba680789b69df5a5aa0469cd1b4da", + "d8ea932623e660669b8e4a9dd8a03aa32a76e466e028d396cc9bbe4047256dc8e5", + "d96a94215aa0403aab713f22e8e024e68db91ab6a027abd1a55b6e804aec9146e4", + "d867ac21e270a0350d6ac91a724037247246d2a6c0396c89d6dc562049244e48d5", + "d8a9b460d3b48026a4ad471b7c20452491b69bbc803ae48db722ee00292491a8db", + "d928a3e1d3b24036e37244abf02047634d371b74c047637148a29ac03b234e38e3", + "d9ab9b21d2e0c0471c693aec54e044dbae46dc7c20391badb724ee8038e469bb15", + "d9a99361a276403b1a6ad6dcd40026e489c8e3bc40371c4dc564e2c036e28eb963", + "BAD", + "BAD", + "BAD", + "BAD", + "BAD", + "BAD", + "d92c8b6d5aee4034ebb22724862047145634a5c0a038e371b8e4a880485c89dd25", + "d8e78b29e3c6c038dba9d91beca04723ad491cda80471471b6ec7ae03b1396b91b", + "d8a78b25e37a0022dd8a46dc68a0351bad391bde2046e56dd8dc96c038e396d89b", + "d8a88c255ab6e038e38e48dbde8038ad8dc8db8ec0376372b564b44038e49234dc", + "d9708ce6a39ce049646646a2c1a0272496b29a66c037db562863ace0795b55b2e3", + "d8ee9bea5ae4003ae371b713eae05adc91995a5ea064dcc9571e786026ed51c52c", + "d9299421d2944036ed69b8e572a048e36d551cd480571d4ec95be680356c69c763", + "d92aab696190c046e26e392cae0026a376a8dc662048d291b75b54c04ad3ae3b1b", + "d8e7a469627a6038e289cb1baca0569b8db6dddec026dc8e38e5dc803722722d23", + "d8a88c299b64c03a548a58e37420272c6dd76b92c0471c9236dbc0e0551c71c713", + "BAD", + "d7299c19a3be8024e58ea7a49f20a522963ad976e0a76ecd92b38500cb62aa4c94", + "d7eb6c6262eee02b2c42e79a60a0aa55aed68a7f00ad358e10fad960e55a39396d", + "d970858dd2ab61d91355ebc15ca1a6a7ca48a05cc0dae66f2523c2a1bad3825daa", + "d8f0844a23ad20da50d6de025e81c37392b9039cc0c764c1bd1e94c1b699736a98", + "d9708ce6a39ce049646646a2c1a0272496b29a66c037db562863ace0795b55b2e3", + "d9299421d2944036ed69b8e572a048e36d551cd480571d4ec95be680356c69c763", + "d9299421d2944036ed69b8e572a048e36d551cd480571d4ec95be680356c69c763", + "d9299421d2944036ed69b8e572a048e36d551cd480571d4ec95be680356c69c763", + "d2577a1cda50004924924924500049249249245000492492492450004923924924", + NULL +}; + +/* Example of a good frame */ +static const char *sample_frame_hex = \ + "d9ec9be212901f802335598c501f805bad3d4ba01f809b69df5a501f809cd1b4da"; + +/** + * Start with a good voice frame and then simulate 20 consecutive bad frames, + * watching how the error concealment decreases the XMAXC parameters. + */ +void test_fr_concealment(void) +{ + struct osmo_ecu_fr_state state; + uint8_t frame[GSM_FR_BYTES]; + int i, rc; + + /* Parse frame from string to hex */ + osmo_hexparse(sample_frame_hex, frame, GSM_FR_BYTES); + + printf("Start with: %s\n", sample_frame_hex); + + /* Reset the ECU with the proposed known good frame */ + osmo_ecu_fr_reset(&state, frame); + + /* Now pretend that we do not receive any good frames anymore */ + for (i = 0; i < 20; i++) { + rc = osmo_ecu_fr_conceal(&state, frame); + OSMO_ASSERT(rc == 0); + + printf("conceal: %02i, result: %s\n", + i, osmo_hexdump_nospc(frame, GSM_FR_BYTES)); + } +} + +/* Simulate a real life situation: voice frames with a few dropouts */ +void test_fr_concealment_realistic() +{ + struct osmo_ecu_fr_state state; + uint8_t frame[GSM_FR_BYTES]; + unsigned int frame_len; + int rc, i = 0; + + while (fr_frames_hex[i] != NULL) { + /* Debug print */ + printf("Frame No. %03i:\n", i); + + /* Good or bad frame? */ + frame_len = strlen(fr_frames_hex[i]) / 2; + if (frame_len == GSM_FR_BYTES) { + printf(" * input: %s\n", fr_frames_hex[i]); + osmo_hexparse(fr_frames_hex[i], frame, GSM_FR_BYTES); + osmo_ecu_fr_reset(&state, frame); + } else { + printf(" * input: (bad)\n"); + memset(frame, 0x00, GSM_FR_BYTES); + rc = osmo_ecu_fr_conceal(&state, frame); + OSMO_ASSERT(rc == 0); + } + + /* Print result */ + printf(" * output: %s\n", + osmo_hexdump_nospc(frame, GSM_FR_BYTES)); + + /* Go to the next frame */ + i++; + } +} + +int main(int argc, char **argv) +{ + /* Perform actual tests */ + test_fr_concealment(); + test_fr_concealment_realistic(); + + return 0; +} diff --git a/tests/codec/codec_ecu_fr_test.ok b/tests/codec/codec_ecu_fr_test.ok new file mode 100644 index 00000000..6e200994 --- /dev/null +++ b/tests/codec/codec_ecu_fr_test.ok @@ -0,0 +1,192 @@ +Start with: d9ec9be212901f802335598c501f805bad3d4ba01f809b69df5a501f809cd1b4da +conceal: 00, result: d9ec9be212901f802335598c501f805bad3d4ba01f809b69df5a501f809cd1b4da +conceal: 01, result: d9ec9be212901d802335598c501d805bad3d4ba01d809b69df5a501d809cd1b4da +conceal: 02, result: d9ec9be212901b802335598c501b805bad3d4ba01b809b69df5a501b809cd1b4da +conceal: 03, result: d9ec9be2129019802335598c5019805bad3d4ba019809b69df5a5019809cd1b4da +conceal: 04, result: d9ec9be2129017802335598c5017805bad3d4ba017809b69df5a5017809cd1b4da +conceal: 05, result: d9ec9be2129015802335598c5015805bad3d4ba015809b69df5a5015809cd1b4da +conceal: 06, result: d9ec9be2129013802335598c5013805bad3d4ba013809b69df5a5013809cd1b4da +conceal: 07, result: d9ec9be2129011802335598c5011805bad3d4ba011809b69df5a5011809cd1b4da +conceal: 08, result: d9ec9be212900f802335598c500f805bad3d4ba00f809b69df5a500f809cd1b4da +conceal: 09, result: d9ec9be212900d802335598c500d805bad3d4ba00d809b69df5a500d809cd1b4da +conceal: 10, result: d9ec9be212900b802335598c500b805bad3d4ba00b809b69df5a500b809cd1b4da +conceal: 11, result: d9ec9be2129009802335598c5009805bad3d4ba009809b69df5a5009809cd1b4da +conceal: 12, result: d9ec9be2129007802335598c5007805bad3d4ba007809b69df5a5007809cd1b4da +conceal: 13, result: d9ec9be2129005802335598c5005805bad3d4ba005809b69df5a5005809cd1b4da +conceal: 14, result: d9ec9be2129003802335598c5003805bad3d4ba003809b69df5a5003809cd1b4da +conceal: 15, result: d9ec9be2129001802335598c5001805bad3d4ba001809b69df5a5001809cd1b4da +conceal: 16, result: d00000000000000000000000000000000000000000000000000000000000000000 +conceal: 17, result: d00000000000000000000000000000000000000000000000000000000000000000 +conceal: 18, result: d00000000000000000000000000000000000000000000000000000000000000000 +conceal: 19, result: d00000000000000000000000000000000000000000000000000000000000000000 +Frame No. 000: + * input: d9aa93ae63de00471a91b95b8660471392b4a2daa037628f391c624039258dc723 + * output: d9aa93ae63de00471a91b95b8660471392b4a2daa037628f391c624039258dc723 +Frame No. 001: + * input: d8eb83699a66c036ec89b7246e6034dc8d48948620589b7256e3a6603b2371b8da + * output: d8eb83699a66c036ec89b7246e6034dc8d48948620589b7256e3a6603b2371b8da +Frame No. 002: + * input: d967abaa1cbe4035238da6ace4c036d46ec69ba600391c4eb8a2b040591c6a3924 + * output: d967abaa1cbe4035238da6ace4c036d46ec69ba600391c4eb8a2b040591c6a3924 +Frame No. 003: + * input: d8e8a42662c240472469b91bd2e0452291b6dba600495b8e38dcb020491a71c91b + * output: d8e8a42662c240472469b91bd2e0452291b6dba600495b8e38dcb020491a71c91b +Frame No. 004: + * input: da2aac1ddbb00036e46e26dcec6039138db923822047137248e3560048e38dc8e3 + * output: da2aac1ddbb00036e46e26dcec6039138db923822047137248e3560048e38dc8e3 +Frame No. 005: + * input: d929ab2a9b5240395b6dc72ba020469c8d551c5440349c9148e36a4036a372471b + * output: d929ab2a9b5240395b6dc72ba020469c8d551c5440349c9148e36a4036a372471b +Frame No. 006: + * input: d9eb93215bb8a0271c69c724682036db71c71a94a0372491b72bee4044eb71b923 + * output: d9eb93215bb8a0271c69c724682036db71c71a94a0372491b72bee4044eb71b923 +Frame No. 007: + * input: d9ab9aa19abc40391b6e5ae2ee40471b91c6dbe820492291b8e4b84036e47238db + * output: 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d2577a1cda50004924924924500049249249245000492492492450004923924924 + * output: d2577a1cda50004924924924500049249249245000492492492450004923924924 diff --git a/tests/testsuite.at b/tests/testsuite.at index 81730ee2..0ec852cc 100644 --- a/tests/testsuite.at +++ b/tests/testsuite.at @@ -157,6 +157,12 @@ cat $abs_srcdir/codec/codec_test.ok > expout AT_CHECK([$abs_top_builddir/tests/codec/codec_test], [0], [expout], [ignore]) AT_CLEANUP +AT_SETUP([codec_ecu_fr]) +AT_KEYWORDS([codec_ecu_fr]) +cat $abs_srcdir/codec/codec_ecu_fr_test.ok > expout +AT_CHECK([$abs_top_builddir/tests/codec/codec_ecu_fr_test], [0], [expout], [ignore]) +AT_CLEANUP + AT_SETUP([fr]) AT_KEYWORDS([fr]) cat $abs_srcdir/fr/fr_test.ok > expout |