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2020-05-14codec: Add functions for AMR s->d bits and d->s bitsHarald Welte2-0/+48
These functions implement re-ordering of bits as per TS 06.90 / 26.101 based on the already existing tables we've had in libosmocoding. Change-Id: Ia4ac2aea2e96f9185f082a07ca64dfc5276efb46
2020-03-13gsm690: Fix amr speech bit length tablePhilipp Maier1-2/+2
The table amr_len_by_ft represents the length of the raw AMR speech bits in bytes. The table is based on the Table found in RFC 4867 ยง3.6, Table 1, Column "Total speech bits". The number of bits is divided by 8 and then rounded up to get the number of consumed octets. An AMR SID frame (including STI and MI) takes up 39 bits, this will result in 5 octets, not in 7. Lets correct this. Related: OS#2978 Change-Id: Icf330450981b32be5d1cee5b10aa92bac4cb72f5
2019-09-20ecu_fr: increase test coverage for FR ECU implementationPhilipp Maier2-0/+84
The ECU implementation for FR is currently tested by calling the related functions directly and by using the generic ECU abstraction layer. However, the test "test_fr_concealment" only tests directly. Lets add a version that uses the generic ECU abstraction layer as well. The generic ECU abstraction layer obsolets the public API functions osmo_ecu_fr_reset() and osmo_ecu_fr_conceal(), lets tag those functions as dprecated. Change-Id: Ib0c8a9b164f14ea4fa00688f760a76cdb4890af4
2019-09-02codec/ecu: Introduce new generic Error Concealment Unit abstractionHarald Welte2-0/+223
We don't want to expose the details of a given ECU implementation to the user (e.g. osmo-bts), but have a generic abstraction layer where an ECU implementation can simply register a few call-back functions with the generic core. As the developer and copyright holder of the related code, I hereby state that any ECU implementation using 'struct osmo_ecu_ops' and registering with the 'osmo_ecu_register()' function shall not be considered as a derivative work under any applicable copyright law; the copyleft terms of GPLv2 shall hence not apply to any such ECU implementation. The intent of the above exception is to allow anyone to combine third party Error Concealment Unit implementations with libosmocore, including but not limited to such published by ETSI. Change-Id: I4d33c9c7c2d4c7462ff38a49c178b65accae1915
2018-07-21tests: codec: ecu_fr: Add buffer with unequal XMAXC valuesPau Espin Pedrol2-17/+47
This buffer verifies that all XMAXC fields must be zero before the entire buffer is considered as silent by osmo_ecu_fr_conceal(). Change-Id: I14a192d001b5e167437cedbe76a1a3dd84dde35c
2018-07-21tests: codec: ecu_fr: Print XMAXC fieldsPau Espin Pedrol2-25/+54
This makes it easy to debug how XMAXC fields are decreased every iteration in osmo_ecu_fr_conceal(). Change-Id: I678d4be5e0b15b05873b0d3bf5ea5bbee7bef839
2018-01-15libosmocodec: implement ECU (Error Concealment Unit) for FRPhilipp Maier2-0/+338
When a bad GSM voice frame is received, it's being replaced by a silence frame. This may cause unpleasant audio effects. This change implements a functionality to craft a replacement frame from the last known good frame. Currently, only FR is supported, support for other codecs may be added latter. Change-Id: I06a21f60db01bfe1c2b838f93866fad1d53fdcd1
2017-11-13Fix/Update copyright notices; Add SPDX annotationHarald Welte1-4/+6
Let's fix some erroneous/accidential references to wrong license, update copyright information where applicable and introduce a SPDX-License-Identifier to all files. Change-Id: I39af26c6aaaf5c926966391f6565fc5936be21af
2017-06-09Fix wrongful GSM FR codec SID frame detection in DTX.Jean-Francois Dionne1-0/+17
Based on ETSI TS 101 318 section 5.1.2 the 95 bits SID code word is not detected correctly due to a wrongful offset in the bits location indexes. Change-Id: I45d98c6edf267f313883503a65385190ffbc65ca
2017-06-09introduce proper test case for GSM FR detectionHarald Welte1-0/+97
our code is actually wrong, so let's skip the test until the fix is applied in a follow-up patch. Change-Id: I710c7871f959671deb3d18ab9062588f3056fd7c
2017-01-10DTX: fix AMR SID-FIRST detectionJean-Francois Dionne1-2/+2
Max's note: adjusted test output. Change-Id: I46477c631bf86345cb757f31d7f2e2935b12adcc Related: OS#1801
2016-11-07Add null-pointer check to osmo_amr_rtp_dec()Max1-3/+9
Check that RTP payload we're about to decode is not NULL and return proper error code instead of segfaulting. Add corresponding test case. Change-Id: Ib6cda9900a41ed16bbfbde9df3de9d38e0a7469b
2016-06-01Add functions to detect HR/FR SID framesMax2-0/+34
Add functions which check if given FR or HR frame (packed in RTP) contains SID (SIlence Descriptor) and corresponding tests. Related: OS#22 Change-Id: I4051e3c0d4fb9ee93d7e9e0ef4abaf9f18e227ca Reviewed-on: https://gerrit.osmocom.org/160 Tested-by: Jenkins Builder Reviewed-by: Harald Welte <laforge@gnumonks.org>
2016-05-31Add helper functions for AMR codecMax2-0/+95
* add functions to encode/decode various codec paramters from RTP payload with AMR frame according to RFC 4867 * those functions are extended version based on code from osmo-bts' amr.c by Andreas Eversberg * add corresponding enum types and strings for logging * add regression tests It's useful both to replace manual parsing in osmo-bts with fuctions covered by test suite and as a debugging helpers for issues related to AMR. Change-Id: Ia217679a07d3fbc970f435e20f6eac33d34bd597 Related: OS#1562 Reviewed-on: https://gerrit.osmocom.org/118 Tested-by: Jenkins Builder Reviewed-by: Holger Freyther <holger@freyther.de>