codec_pref: move match_codec_pref() to separate c-file and add unit-test

At the moment there are three sources that may advertise a list of
supported audio codec/rate settings. There is the MS that advertises
advertises a speech codec list and the MSC that sends a channel type
information element over A and there are also settings in the bsc
configuration file that may restrict the codec/rate types that are
allowed to use.

The function match_codec_pref() looks at all of the three buckets and
selects a codec that satisfies all three. This is already a somewhat
complicated process, overit is very isolated, so lets give it its own
c-file.

Due to the lack of unit-tests it is very hard to make changes here so
lets add also unit-test to make sure that regressions are catched early.

- Put match_codec_pref() and all its helper functions into a separate
  c-file.
- Add a unit test.

Change-Id: Iabedfdcec8b99a319f2d57cbea45c5e36c7b6e29
Related: OS#3361

5 files changed, 1246 insertions, 0 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 95d836b9b..9b4cfe4a2 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -1,5 +1,6 @@
 SUBDIRS = \
 	bsc \
+	codec_pref \
 	gsm0408 \
 	abis \
 	subscr \
diff --git a/tests/codec_pref/Makefile.am b/tests/codec_pref/Makefile.am
new file mode 100644
index 000000000..e000252da
--- /dev/null
+++ b/tests/codec_pref/Makefile.am
@@ -0,0 +1,34 @@
+AM_CPPFLAGS = \
+	$(all_includes) \
+	-I$(top_srcdir)/include \
+	$(NULL)
+
+AM_CFLAGS = \
+	-Wall \
+	$(LIBOSMOCORE_CFLAGS) \
+	$(LIBOSMOGSM_CFLAGS) \
+	$(LIBOSMOABIS_CFLAGS) \
+	$(LIBOSMOSIGTRAN_CFLAGS) \
+	$(NULL)
+
+AM_LDFLAGS = \
+	$(NULL)
+
+EXTRA_DIST = \
+	codec_pref_test.ok \
+	$(NULL)
+
+noinst_PROGRAMS = \
+	codec_pref_test \
+	$(NULL)
+
+codec_pref_test_SOURCES = \
+	codec_pref_test.c \
+	$(NULL)
+
+codec_pref_test_LDADD = \
+	$(top_builddir)/src/osmo-bsc/codec_pref.o \
+	$(LIBOSMOCORE_LIBS) \
+	$(LIBOSMOGSM_LIBS) \
+	-lrt \
+	$(NULL)
diff --git a/tests/codec_pref/codec_pref_test.c b/tests/codec_pref/codec_pref_test.c
new file mode 100644
index 000000000..73547ad9d
--- /dev/null
+++ b/tests/codec_pref/codec_pref_test.c
@@ -0,0 +1,498 @@
+/*
+ * (C) 2018 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * Author: Philipp Maier
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <osmocom/bsc/osmo_bsc.h>
+#include <osmocom/bsc/bsc_msc_data.h>
+#include <osmocom/bsc/gsm_04_80.h>
+#include <osmocom/core/application.h>
+#include <osmocom/bsc/codec_pref.h>
+
+#include <stdio.h>
+
+void *ctx = NULL;
+
+#define MSC_AUDIO_SUPPORT_MAX 5
+#define N_CONFIG_VARIANTS 9
+
+/* Make sure that there is some memory to put our test configuration. */
+static void init_msc_config(struct bsc_msc_data *msc)
+{
+	unsigned int i;
+
+	msc->audio_support = talloc_zero_array(ctx, struct gsm_audio_support *, MSC_AUDIO_SUPPORT_MAX);
+	msc->audio_length = MSC_AUDIO_SUPPORT_MAX;
+	for (i = 0; i < MSC_AUDIO_SUPPORT_MAX; i++) {
+		msc->audio_support[i] = talloc_zero(msc->audio_support, struct gsm_audio_support);
+	}
+}
+
+/* Free memory that we have used for the test configuration. */
+static void free_msc_config(struct bsc_msc_data *msc)
+{
+	talloc_free(msc->audio_support);
+}
+
+/* The speech codec list is sent by the MS and lists the voice codec settings
+ * that the MS is able to support. The BSC must select one of this codecs
+ * depending on what the MSC is able to support. The following function
+ * generates some realistically made up speech codec lists. */
+static void make_scl_config(struct gsm0808_speech_codec_list *scl, uint8_t config_no)
+{
+	OSMO_ASSERT(config_no < N_CONFIG_VARIANTS);
+
+	switch (config_no) {
+	case 0:
+		/* FR1 only */
+		scl->codec[0].type = GSM0808_SCT_FR1;
+		scl->len = 1;
+		break;
+	case 1:
+		/* HR1 only */
+		scl->codec[0].type = GSM0808_SCT_HR1;
+		scl->len = 1;
+		break;
+	case 2:
+		/* FR2 only */
+		scl->codec[0].type = GSM0808_SCT_FR2;
+		scl->len = 1;
+		break;
+	case 3:
+		/* FR3 only */
+		scl->codec[0].type = GSM0808_SCT_FR3;
+		scl->len = 1;
+		break;
+	case 4:
+		/* HR3 only */
+		scl->codec[0].type = GSM0808_SCT_HR3;
+		scl->len = 1;
+		break;
+	case 5:
+		/* FR1 and HR1 */
+		scl->codec[0].type = GSM0808_SCT_FR1;
+		scl->codec[1].type = GSM0808_SCT_HR1;
+		scl->len = 2;
+		break;
+	case 6:
+		/* FR1, FR2 and HR1 */
+		scl->codec[0].type = GSM0808_SCT_FR1;
+		scl->codec[1].type = GSM0808_SCT_FR2;
+		scl->codec[2].type = GSM0808_SCT_HR1;
+		scl->len = 3;
+		break;
+	case 7:
+		/* FR1, FR3 and HR3 */
+		scl->codec[0].type = GSM0808_SCT_FR1;
+		scl->codec[1].type = GSM0808_SCT_FR3;
+		scl->codec[2].type = GSM0808_SCT_HR3;
+		scl->len = 3;
+		break;
+	case 8:
+		/* FR1, FR2, FR3, HR1 and HR3 */
+		scl->codec[0].type = GSM0808_SCT_FR1;
+		scl->codec[1].type = GSM0808_SCT_FR2;
+		scl->codec[2].type = GSM0808_SCT_FR3;
+		scl->codec[3].type = GSM0808_SCT_HR1;
+		scl->codec[4].type = GSM0808_SCT_HR3;
+		scl->len = 5;
+		break;
+	}
+}
+
+/* The channel type element which is sent to the BSC by the MSC lists all the
+ * codecs that the MSC is able to support. The following function generates
+ * a realistic permitted speech settings */
+static void make_ct_config(struct gsm0808_channel_type *ct, uint8_t config_no)
+{
+	OSMO_ASSERT(config_no < N_CONFIG_VARIANTS);
+
+	switch (config_no) {
+	case 0:
+		/* FR1 only */
+		ct->perm_spch[0] = GSM0808_PERM_FR1;
+		ct->perm_spch_len = 1;
+		break;
+	case 1:
+		/* HR1 only */
+		ct->perm_spch[0] = GSM0808_PERM_HR1;
+		ct->perm_spch_len = 1;
+		break;
+	case 2:
+		/* FR2 only */
+		ct->perm_spch[0] = GSM0808_PERM_FR2;
+		ct->perm_spch_len = 1;
+		break;
+	case 3:
+		/* FR3 only */
+		ct->perm_spch[0] = GSM0808_PERM_FR3;
+		ct->perm_spch_len = 1;
+		break;
+	case 4:
+		/* HR3 only */
+		ct->perm_spch[0] = GSM0808_PERM_HR3;
+		ct->perm_spch_len = 1;
+		break;
+	case 5:
+		/* FR1 and HR1 */
+		ct->perm_spch[0] = GSM0808_PERM_FR1;
+		ct->perm_spch[1] = GSM0808_PERM_HR1;
+		ct->perm_spch_len = 2;
+		break;
+	case 6:
+		/* FR1, FR2 and HR1 */
+		ct->perm_spch[0] = GSM0808_PERM_FR1;
+		ct->perm_spch[1] = GSM0808_PERM_FR2;
+		ct->perm_spch[2] = GSM0808_PERM_HR1;
+		ct->perm_spch_len = 3;
+		break;
+	case 7:
+		/* FR1, FR3 and HR3 */
+		ct->perm_spch[0] = GSM0808_PERM_FR1;
+		ct->perm_spch[1] = GSM0808_PERM_FR3;
+		ct->perm_spch[2] = GSM0808_PERM_HR3;
+		ct->perm_spch_len = 3;
+		break;
+	case 8:
+		/* FR1, FR2, FR3, HR1 and HR3 */
+		ct->perm_spch[0] = GSM0808_PERM_FR1;
+		ct->perm_spch[1] = GSM0808_PERM_FR2;
+		ct->perm_spch[2] = GSM0808_PERM_FR3;
+		ct->perm_spch[3] = GSM0808_PERM_HR1;
+		ct->perm_spch[4] = GSM0808_PERM_HR3;
+		ct->perm_spch_len = 5;
+		break;
+	}
+}
+
+/* Generate some realistic MSC configuration which one also could find in the
+ * real world. This configuration acts as a filter. While the MSC could in
+ * theory advertise codecs more codecs as we are able to support we have to
+ * make sure that only the codecs we have support for are considered. */
+static void make_msc_config(struct bsc_msc_data *msc, uint8_t config_no)
+{
+	/* 1 = FR1/HR1
+	 * 2 = FR2/HR2
+	 * 3 = FR2/HR3
+	 * Note: HR2 is deprecated */
+
+	OSMO_ASSERT(config_no < N_CONFIG_VARIANTS);
+
+	switch (config_no) {
+	case 0:
+		/* FR1 only */
+		msc->audio_support[0]->ver = 1;
+		msc->audio_support[0]->hr = 0;
+		msc->audio_length = 1;
+		break;
+	case 1:
+		/* HR1 only */
+		msc->audio_support[0]->ver = 1;
+		msc->audio_support[0]->hr = 1;
+		msc->audio_length = 1;
+		break;
+	case 2:
+		/* FR2 only */
+		msc->audio_support[0]->ver = 2;
+		msc->audio_support[0]->hr = 0;
+		msc->audio_length = 1;
+		break;
+	case 3:
+		/* FR3 only */
+		msc->audio_support[0]->ver = 3;
+		msc->audio_support[0]->hr = 0;
+		msc->audio_length = 1;
+		break;
+	case 4:
+		/* HR3 only */
+		msc->audio_support[0]->ver = 3;
+		msc->audio_support[0]->hr = 1;
+		msc->audio_length = 1;
+		break;
+	case 5:
+		/* FR1 and HR1 */
+		msc->audio_support[0]->ver = 1;
+		msc->audio_support[0]->hr = 0;
+		msc->audio_support[1]->ver = 1;
+		msc->audio_support[1]->hr = 1;
+		msc->audio_length = 2;
+		break;
+	case 6:
+		/* FR1, FR2 and HR1 */
+		msc->audio_support[0]->ver = 1;
+		msc->audio_support[0]->hr = 0;
+		msc->audio_support[1]->ver = 2;
+		msc->audio_support[1]->hr = 0;
+		msc->audio_support[2]->ver = 1;
+		msc->audio_support[2]->hr = 1;
+		msc->audio_length = 3;
+		break;
+	case 7:
+		/* FR1, FR3 and HR3 */
+		msc->audio_support[0]->ver = 1;
+		msc->audio_support[0]->hr = 0;
+		msc->audio_support[1]->ver = 3;
+		msc->audio_support[1]->hr = 0;
+		msc->audio_support[2]->ver = 3;
+		msc->audio_support[2]->hr = 1;
+		msc->audio_length = 3;
+		break;
+	case 8:
+		/* FR1, FR2, FR3, HR1 and HR3 */
+		msc->audio_support[0]->ver = 1;
+		msc->audio_support[0]->hr = 0;
+		msc->audio_support[1]->ver = 2;
+		msc->audio_support[1]->hr = 0;
+		msc->audio_support[2]->ver = 3;
+		msc->audio_support[2]->hr = 0;
+		msc->audio_support[3]->ver = 1;
+		msc->audio_support[3]->hr = 1;
+		msc->audio_support[4]->ver = 3;
+		msc->audio_support[4]->hr = 1;
+		msc->audio_length = 5;
+		break;
+	}
+}
+
+/* Try execute match_codec_pref(), display input and output parameters */
+static int test_match_codec_pref(const struct gsm0808_channel_type *ct,
+				 const struct gsm0808_speech_codec_list *scl, const struct bsc_msc_data *msc)
+{
+	int rc;
+	unsigned int i;
+	int full_rate;
+	enum gsm48_chan_mode chan_mode;
+
+	printf("Determining channel mode and rate:\n");
+
+	printf(" * MS: speech codec list (%u items):\n", scl->len);
+	for (i = 0; i < scl->len; i++)
+		printf("   codec[%u]->type=%s\n", i, gsm0808_speech_codec_type_name(scl->codec[i].type));
+
+	printf(" * MSC: channel type permitted speech (%u items):\n", ct->perm_spch_len);
+	for (i = 0; i < ct->perm_spch_len; i++)
+		printf("   perm_spch[%u]=%s\n", i, gsm0808_permitted_speech_name(ct->perm_spch[i]));
+
+	printf(" * BSS: audio support settings (%u items):\n", msc->audio_length);
+	for (i = 0; i < msc->audio_length; i++)
+		if (msc->audio_support[i]->hr)
+			printf("   audio_support[%u]=HR%u\n", i, msc->audio_support[i]->ver);
+		else
+			printf("   audio_support[%u]=FR%u\n", i, msc->audio_support[i]->ver);
+
+	rc = match_codec_pref(&full_rate, &chan_mode, ct, scl, msc);
+	printf(" * result: rc=%i, full_rate=%i, chan_mode=%s\n", rc, full_rate, gsm48_chan_mode_name(chan_mode));
+
+	printf("\n");
+
+	return rc;
+}
+
+/* MS, MSC and local MSC settings are the same */
+static void test_one_to_one(void)
+{
+	unsigned int i;
+	struct gsm0808_channel_type ct_msc;
+	struct gsm0808_speech_codec_list scl_ms;
+	struct bsc_msc_data msc_local;
+	int rc;
+
+	printf("============== test_one_to_one ==============\n\n");
+
+	init_msc_config(&msc_local);
+
+	for (i = 0; i < N_CONFIG_VARIANTS; i++) {
+		make_msc_config(&msc_local, i);
+		make_scl_config(&scl_ms, i);
+		make_ct_config(&ct_msc, i);
+		rc = test_match_codec_pref(&ct_msc, &scl_ms, &msc_local);
+		OSMO_ASSERT(rc == 0);
+	}
+
+	free_msc_config(&msc_local);
+}
+
+/* Network supports all combinations, MS varies */
+static void test_ms(void)
+{
+	unsigned int i;
+	struct gsm0808_channel_type ct_msc;
+	struct gsm0808_speech_codec_list scl_ms;
+	struct bsc_msc_data msc_local;
+	int rc;
+
+	printf("============== test_ms ==============\n\n");
+
+	init_msc_config(&msc_local);
+
+	make_msc_config(&msc_local, 8);
+	make_ct_config(&ct_msc, 8);
+	for (i = 0; i < N_CONFIG_VARIANTS; i++) {
+		make_scl_config(&scl_ms, i);
+		rc = test_match_codec_pref(&ct_msc, &scl_ms, &msc_local);
+		OSMO_ASSERT(rc == 0);
+	}
+
+	free_msc_config(&msc_local);
+}
+
+/* BSS and MS support all combinations, MSC varies */
+static void test_ct(void)
+{
+	unsigned int i;
+	struct gsm0808_channel_type ct_msc;
+	struct gsm0808_speech_codec_list scl_ms;
+	struct bsc_msc_data msc_local;
+	int rc;
+
+	printf("============== test_ct ==============\n\n");
+
+	init_msc_config(&msc_local);
+
+	make_msc_config(&msc_local, 8);
+	make_scl_config(&scl_ms, 8);
+	for (i = 0; i < N_CONFIG_VARIANTS; i++) {
+		make_ct_config(&ct_msc, i);
+		rc = test_match_codec_pref(&ct_msc, &scl_ms, &msc_local);
+		OSMO_ASSERT(rc == 0);
+	}
+
+	free_msc_config(&msc_local);
+}
+
+/* MSC and MS support all combinations, BSS varies */
+static void test_msc(void)
+{
+	unsigned int i;
+	struct gsm0808_channel_type ct_msc;
+	struct gsm0808_speech_codec_list scl_ms;
+	struct bsc_msc_data msc_local;
+	int rc;
+
+	printf("============== test_msc ==============\n\n");
+
+	init_msc_config(&msc_local);
+
+	make_ct_config(&ct_msc, 8);
+	make_scl_config(&scl_ms, 8);
+	for (i = 0; i < N_CONFIG_VARIANTS; i++) {
+		make_msc_config(&msc_local, 8);
+		rc = test_match_codec_pref(&ct_msc, &scl_ms, &msc_local);
+		OSMO_ASSERT(rc == 0);
+	}
+
+	free_msc_config(&msc_local);
+}
+
+/* Some mixed configurations that are supposed to work */
+static void test_selected_working(void)
+{
+	struct gsm0808_channel_type ct_msc;
+	struct gsm0808_speech_codec_list scl_ms;
+	struct bsc_msc_data msc_local;
+	int rc;
+
+	printf("============== test_selected_working ==============\n\n");
+
+	init_msc_config(&msc_local);
+
+	make_scl_config(&scl_ms, 6);
+	make_ct_config(&ct_msc, 5);
+	make_msc_config(&msc_local, 7);
+	rc = test_match_codec_pref(&ct_msc, &scl_ms, &msc_local);
+	OSMO_ASSERT(rc == 0);
+
+	make_scl_config(&scl_ms, 0);
+	make_ct_config(&ct_msc, 5);
+	make_msc_config(&msc_local, 7);
+	rc = test_match_codec_pref(&ct_msc, &scl_ms, &msc_local);
+	OSMO_ASSERT(rc == 0);
+
+	make_scl_config(&scl_ms, 1);
+	make_ct_config(&ct_msc, 5);
+	make_msc_config(&msc_local, 6);
+	rc = test_match_codec_pref(&ct_msc, &scl_ms, &msc_local);
+	OSMO_ASSERT(rc == 0);
+
+	free_msc_config(&msc_local);
+}
+
+/* Some mixed configurations that can not work */
+static void test_selected_non_working(void)
+{
+	struct gsm0808_channel_type ct_msc;
+	struct gsm0808_speech_codec_list scl_ms;
+	struct bsc_msc_data msc_local;
+	int rc;
+
+	printf("============== test_selected_non_working ==============\n\n");
+
+	init_msc_config(&msc_local);
+
+	make_scl_config(&scl_ms, 1);
+	make_ct_config(&ct_msc, 5);
+	make_msc_config(&msc_local, 7);
+	rc = test_match_codec_pref(&ct_msc, &scl_ms, &msc_local);
+	OSMO_ASSERT(rc == -1);
+
+	make_scl_config(&scl_ms, 1);
+	make_ct_config(&ct_msc, 5);
+	make_msc_config(&msc_local, 7);
+	rc = test_match_codec_pref(&ct_msc, &scl_ms, &msc_local);
+	OSMO_ASSERT(rc == -1);
+
+	make_scl_config(&scl_ms, 1);
+	make_ct_config(&ct_msc, 4);
+	make_msc_config(&msc_local, 6);
+	rc = test_match_codec_pref(&ct_msc, &scl_ms, &msc_local);
+	OSMO_ASSERT(rc == -1);
+
+	free_msc_config(&msc_local);
+}
+
+static const struct log_info_cat log_categories[] = {
+	[DMSC] = {
+		  .name = "DMSC",
+		  .description = "Mobile Switching Center",
+		  .enabled = 1,.loglevel = LOGL_NOTICE,
+		  },
+};
+
+static const struct log_info log_info = {
+	.cat = log_categories,
+	.num_cat = ARRAY_SIZE(log_categories),
+};
+
+int main(int argc, char **argv)
+{
+	ctx = talloc_named_const(NULL, 0, "codec_pref_test");
+	msgb_talloc_ctx_init(ctx, 0);
+	osmo_init_logging2(ctx, &log_info);
+
+	test_one_to_one();
+	test_ms();
+	test_ct();
+	test_msc();
+	test_selected_working();
+	test_selected_non_working();
+
+	printf("Testing execution completed.\n");
+	talloc_free(ctx);
+	return 0;
+}
diff --git a/tests/codec_pref/codec_pref_test.ok b/tests/codec_pref/codec_pref_test.ok
new file mode 100644
index 000000000..f97fbb166
--- /dev/null
+++ b/tests/codec_pref/codec_pref_test.ok
@@ -0,0 +1,707 @@
+============== test_one_to_one ==============
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=FR1
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=FR1
+ * BSS: audio support settings (1 items):
+   audio_support[0]=FR1
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=HR1
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=HR1
+ * BSS: audio support settings (1 items):
+   audio_support[0]=HR1
+ * result: rc=0, full_rate=0, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=FR2
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=FR2
+ * BSS: audio support settings (1 items):
+   audio_support[0]=FR2
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_EFR
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=FR3
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=FR3
+ * BSS: audio support settings (1 items):
+   audio_support[0]=FR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_AMR
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=HR3
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=HR3
+ * BSS: audio support settings (1 items):
+   audio_support[0]=HR3
+ * result: rc=0, full_rate=0, chan_mode=SPEECH_AMR
+
+Determining channel mode and rate:
+ * MS: speech codec list (2 items):
+   codec[0]->type=FR1
+   codec[1]->type=HR1
+ * MSC: channel type permitted speech (2 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=HR1
+ * BSS: audio support settings (2 items):
+   audio_support[0]=FR1
+   audio_support[1]=HR1
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (3 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=HR1
+ * MSC: channel type permitted speech (3 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=HR1
+ * BSS: audio support settings (3 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=HR1
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (3 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR3
+   codec[2]->type=HR3
+ * MSC: channel type permitted speech (3 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR3
+   perm_spch[2]=HR3
+ * BSS: audio support settings (3 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR3
+   audio_support[2]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+============== test_ms ==============
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=FR1
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=HR1
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=0, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=FR2
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_EFR
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=FR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_AMR
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=0, chan_mode=SPEECH_AMR
+
+Determining channel mode and rate:
+ * MS: speech codec list (2 items):
+   codec[0]->type=FR1
+   codec[1]->type=HR1
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (3 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=HR1
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (3 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR3
+   codec[2]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+============== test_ct ==============
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=FR1
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=HR1
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=0, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=FR2
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_EFR
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=FR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_AMR
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=0, chan_mode=SPEECH_AMR
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (2 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=HR1
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (3 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=HR1
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (3 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR3
+   perm_spch[2]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+============== test_msc ==============
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (5 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=FR3
+   codec[3]->type=HR1
+   codec[4]->type=HR3
+ * MSC: channel type permitted speech (5 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=FR2
+   perm_spch[2]=FR3
+   perm_spch[3]=HR1
+   perm_spch[4]=HR3
+ * BSS: audio support settings (5 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=FR3
+   audio_support[3]=HR1
+   audio_support[4]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+============== test_selected_working ==============
+
+Determining channel mode and rate:
+ * MS: speech codec list (3 items):
+   codec[0]->type=FR1
+   codec[1]->type=FR2
+   codec[2]->type=HR1
+ * MSC: channel type permitted speech (2 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=HR1
+ * BSS: audio support settings (3 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR3
+   audio_support[2]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=FR1
+ * MSC: channel type permitted speech (2 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=HR1
+ * BSS: audio support settings (3 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR3
+   audio_support[2]=HR3
+ * result: rc=0, full_rate=1, chan_mode=SPEECH_V1
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=HR1
+ * MSC: channel type permitted speech (2 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=HR1
+ * BSS: audio support settings (3 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=HR1
+ * result: rc=0, full_rate=0, chan_mode=SPEECH_V1
+
+============== test_selected_non_working ==============
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=HR1
+ * MSC: channel type permitted speech (2 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=HR1
+ * BSS: audio support settings (3 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR3
+   audio_support[2]=HR3
+ * result: rc=-1, full_rate=-1, chan_mode=SIGNALLING
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=HR1
+ * MSC: channel type permitted speech (2 items):
+   perm_spch[0]=FR1
+   perm_spch[1]=HR1
+ * BSS: audio support settings (3 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR3
+   audio_support[2]=HR3
+ * result: rc=-1, full_rate=-1, chan_mode=SIGNALLING
+
+Determining channel mode and rate:
+ * MS: speech codec list (1 items):
+   codec[0]->type=HR1
+ * MSC: channel type permitted speech (1 items):
+   perm_spch[0]=HR3
+ * BSS: audio support settings (3 items):
+   audio_support[0]=FR1
+   audio_support[1]=FR2
+   audio_support[2]=HR1
+ * result: rc=-1, full_rate=-1, chan_mode=SIGNALLING
+
+Testing execution completed.
diff --git a/tests/testsuite.at b/tests/testsuite.at
index 515ffa0cb..f38465554 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -26,6 +26,12 @@ cat $abs_srcdir/bsc/bsc_test.ok > expout
 AT_CHECK([$abs_top_builddir/tests/bsc/bsc_test], [], [expout], [ignore])
 AT_CLEANUP
 
+AT_SETUP([codec_pref])
+AT_KEYWORDS([codec_pref])
+cat $abs_srcdir/codec_pref/codec_pref_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/codec_pref/codec_pref_test], [], [expout], [ignore])
+AT_CLEANUP
+
 AT_SETUP([nanobts_omlattr])
 AT_KEYWORDS([nanobts_omlattr])
 cat $abs_srcdir/nanobts_omlattr/nanobts_omlattr_test.ok > expout