@@ -80,6 +80,7 @@
tests/ringbuf/ringbuf_test
tests/strrb/strrb_test
tests/vty/vty_test
+tests/codec/codec_test
tests/gb/gprs_bssgp_test
tests/smscb/gsm0341_test
tests/bitvec/bitvec_test
@@ -2,6 +2,8 @@
#include <stdint.h>
+#include <osmocom/core/utils.h>
+
extern const uint16_t gsm610_bitorder[]; /* FR */
extern const uint16_t gsm620_unvoiced_bitorder[]; /* HR unvoiced */
extern const uint16_t gsm620_voiced_bitorder[]; /* HR voiced */
@@ -15,3 +17,32 @@
extern const uint16_t gsm690_5_9_bitorder[]; /* AMR 5.9 kbits */
extern const uint16_t gsm690_5_15_bitorder[]; /* AMR 5.15 kbits */
extern const uint16_t gsm690_4_75_bitorder[]; /* AMR 4.75 kbits */
+
+extern const struct value_string osmo_amr_type_names[];
+
+enum osmo_amr_type {
+ AMR_4_75 = 0,
+ AMR_5_15 = 1,
+ AMR_5_90 = 2,
+ AMR_6_70 = 3,
+ AMR_7_40 = 4,
+ AMR_7_95 = 5,
+ AMR_10_2 = 6,
+ AMR_12_2 = 7,
+ AMR_SID = 8,
+ AMR_GSM_EFR_SID = 9,
+ AMR_TDMA_EFR_SID = 10,
+ AMR_PDC_EFR_SID = 11,
+ AMR_NO_DATA = 15,
+};
+
+enum osmo_amr_quality {
+ AMR_BAD = 0,
+ AMR_GOOD = 1
+};
+
+int osmo_amr_rtp_enc(uint8_t *payload, uint8_t cmr, enum osmo_amr_type ft,
+ enum osmo_amr_quality bfi);
+int osmo_amr_rtp_dec(const uint8_t *payload, int payload_len, uint8_t *cmr,
+ int8_t *cmi, enum osmo_amr_type *ft,
+ enum osmo_amr_quality *bfi, int8_t *sti);
@@ -22,7 +22,10 @@
*/
#include <stdint.h>
+#include <errno.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/codec/codec.h>
/*
* These table map between the raw encoder parameter output and
* the format used before channel coding. Both in GSM and in various
@@ -208,3 +211,104 @@
88, 90, 91, 34, 55, 68, 89, 37, 58, 71,
92, 31, 52, 65, 86,
};
+
+static const uint8_t amr_len_by_ft[16] = {
+ 12, 13, 15, 17, 19, 20, 26, 31, 0, 0, 0, 0, 0, 0, 0, 0
+};
+
+const struct value_string osmo_amr_type_names[] = {
+ { AMR_4_75, "AMR 4,75 kbits/s" },
+ { AMR_5_15, "AMR 5,15 kbit/s" },
+ { AMR_5_90, "AMR 5,90 kbit/s" },
+ { AMR_6_70, "AMR 6,70 kbit/s (PDC-EFR)" },
+ { AMR_7_40, "AMR 7,40 kbit/s (TDMA-EFR)" },
+ { AMR_7_95, "AMR 7,95 kbit/s" },
+ { AMR_10_2, "AMR 10,2 kbit/s" },
+ { AMR_12_2, "AMR 12,2 kbit/s (GSM-EFR)" },
+ { AMR_SID, "AMR SID" },
+ { AMR_GSM_EFR_SID, "GSM-EFR SID" },
+ { AMR_TDMA_EFR_SID, "TDMA-EFR SID" },
+ { AMR_PDC_EFR_SID, "PDC-EFR SID" },
+ { AMR_NO_DATA, "No Data/NA" },
+ { 0, NULL },
+};
+
+/*! \brief Decode various AMR parameters from RTP payload (RFC 4867) acording to
+ * 3GPP TS 26.101
+ * \param[in] rtppayload Payload from RTP packet
+ * \param[in] payload_len length of rtppayload
+ * \param[out] cmr AMR Codec Mode Request, not filled if NULL
+ * \param[out] cmi AMR Codec Mode Indicator, -1 if not applicable for this type,
+ * not filled if NULL
+ * \param[out] ft AMR Frame Type, not filled if NULL
+ * \param[out] bfi AMR Bad Frame Indicator, not filled if NULL
+ * \param[out] sti AMR SID Type Indicator, -1 if not applicable for this type,
+ * not filled if NULL
+ * \returns length of AMR data or negative value on error
+ */
+int osmo_amr_rtp_dec(const uint8_t *rtppayload, int payload_len, uint8_t *cmr,
+ int8_t *cmi, enum osmo_amr_type *ft,
+ enum osmo_amr_quality *bfi, int8_t *sti)
+{
+ /* RFC 4867 § 4.4.2 ToC - compound payloads are not supported: F = 0 */
+ uint8_t type = (rtppayload[1] >> 3) & 0xf;
+
+ /* compound payloads are not supported */
+ if (rtppayload[1] >> 7)
+ return -ENOTSUP;
+
+ if (payload_len - 2 < amr_len_by_ft[type])
+ return -ENOTSUP;
+
+ if (payload_len < 2)
+ return -EINVAL;
+
+ if (ft)
+ *ft = type;
+
+ if (cmr)
+ *cmr = rtppayload[0] >> 4;
+
+ if (bfi)
+ *bfi = (rtppayload[1] >> 2) & 1;
+
+ /* Table 6 in 3GPP TS 26.101 */
+ if (cmi)
+ *cmi = (type == AMR_SID) ? ((rtppayload[6] >> 1) & 7) : -1;
+
+ if (sti)
+ *sti = (type == AMR_SID) ? (rtppayload[6] & 0x10) : -1;
+
+ return 2 + amr_len_by_ft[type];
+}
+
+/*! \brief Encode various AMR parameters from RTP payload (RFC 4867)
+ * \param[out] payload Payload for RTP packet, contains speech data (if any)
+ * except for have 2 first bytes where header will be built
+ * \param[in] cmr AMR codec Mode Request
+ * \param[in] ft AMR Frame Type
+ * \param[in] bfi AMR Bad Frame Indicator
+ * \returns length of AMR data (header + ToC + speech data) or negative value
+ * on error
+ *
+ * Note: only octet-aligned mode is supported so the header occupies 2 full
+ * bytes. Optional interleaving header is not supported.
+ */
+int osmo_amr_rtp_enc(uint8_t *payload, uint8_t cmr, enum osmo_amr_type ft,
+ enum osmo_amr_quality bfi)
+{
+ if (cmr > 15)
+ return -EINVAL;
+
+ if (ft > 15)
+ return -EMEDIUMTYPE;
+
+ /* RFC 4867 § 4.3.1 payload header */
+ payload[0] = cmr << 4;
+
+ /* RFC 4867 § 4.4.2 ToC - compound payloads are not supported: F = 0 */
+ payload[1] = (((uint8_t)ft) << 3) | (((uint8_t)bfi) << 2);
+
+ /* speech data */
+ return 2 + amr_len_by_ft[ft];
+}
@@ -8,7 +8,7 @@
gsm0808/gsm0808_test gsm0408/gsm0408_test \
gb/bssgp_fc_test gb/gprs_bssgp_test gb/gprs_ns_test \
gprs/gprs_test kasumi/kasumi_test \
- logging/logging_test fr/fr_test \
+ logging/logging_test fr/fr_test codec/codec_test \
loggingrb/loggingrb_test strrb/strrb_test \
vty/vty_test comp128/comp128_test utils/utils_test \
smscb/gsm0341_test stats/stats_test \
@@ -97,6 +97,9 @@
fr_fr_test_SOURCES = fr/fr_test.c
fr_fr_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/gb/libosmogb.la $(LIBRARY_DL)
+codec_codec_test_SOURCES = codec/codec_test.c
+codec_codec_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/codec/libosmocodec.la
+
loggingrb_loggingrb_test_SOURCES = loggingrb/loggingrb_test.c
loggingrb_loggingrb_test_LDADD = $(top_builddir)/src/libosmocore.la $(top_builddir)/src/vty/libosmovty.la
@@ -141,7 +144,7 @@
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 \
- gprs/gprs_test.ok kasumi/kasumi_test.ok \
+ gprs/gprs_test.ok kasumi/kasumi_test.ok codec/codec_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 \
new file mode 100644
@@ -0,0 +1,54 @@
+/*
+ * (C) 2016 by Sysmocom s.f.m.c. GmbH
+ * All Rights Reserved
+ *
+ * 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 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 <stdio.h>
+#include <stdlib.h>
+
+#include <osmocom/core/utils.h>
+#include <osmocom/codec/codec.h>
+
+const uint8_t sid_update[] = {0x20, 0x44, 0x29, 0xc2, 0x92, 0x91, 0xf4};
+const uint8_t sid_first[] = {0x20, 0x44, 0x00, 0x00, 0x00, 0x00, 0x04};
+
+static void test_sid_dec(const uint8_t *t, size_t len)
+{
+ uint8_t cmr;
+ enum osmo_amr_type ft;
+ enum osmo_amr_quality bfi;
+ int8_t sti, cmi;
+ int rc = osmo_amr_rtp_dec(t, len, &cmr, &cmi, &ft, &bfi, &sti);
+ printf("[%d] decode RTP %s%s: FT %s, CMR %s, CMI is %d, SID type %s\n",
+ rc, osmo_hexdump(t, len), bfi == AMR_GOOD ? "OK" : "BAD",
+ get_value_string(osmo_amr_type_names, ft),
+ get_value_string(osmo_amr_type_names, cmr),
+ cmi, sti ? "UPDATE" : "FIRST");
+ if (sti == -1)
+ printf("FAIL: incompatible STI for SID\n");
+}
+
+int main(int argc, char **argv)
+{
+ printf("AMR RTP payload decoder test:\n");
+ test_sid_dec(sid_first, 7);
+ test_sid_dec(sid_update, 7);
+
+ return 0;
+}
+
+
new file mode 100644
@@ -0,0 +1,3 @@
+AMR RTP payload decoder test:
+[2] decode RTP 20 44 00 00 00 00 04 OK: FT AMR SID, CMR AMR 5,90 kbit/s, CMI is 2, SID type FIRST
+[2] decode RTP 20 44 29 c2 92 91 f4 OK: FT AMR SID, CMR AMR 5,90 kbit/s, CMI is 2, SID type UPDATE
@@ -115,12 +115,17 @@
AT_CHECK([$abs_top_builddir/tests/logging/logging_test], [0], [expout], [experr])
AT_CLEANUP
+AT_SETUP([codec])
+AT_KEYWORDS([codec])
+cat $abs_srcdir/codec/codec_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/codec/codec_test], [0], [expout], [ignore])
+AT_CLEANUP
+
AT_SETUP([fr])
AT_KEYWORDS([fr])
cat $abs_srcdir/fr/fr_test.ok > expout
cat $abs_srcdir/fr/fr_test.err > experr
AT_CHECK([$abs_top_builddir/tests/fr/fr_test], [0], [expout], [experr])
-
AT_CLEANUP
AT_SETUP([loggingrb])