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annotate efr-sid/Unit-test-desc @ 54:0832b5ac62b2

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efr-sid/Unit-test-desc: update for complete status
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 19 Aug 2024 17:40:43 +0000
parents 637ee027999b
children
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637ee027999b efr-sid/Unit-test-desc: blurb written
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1 Unit test for EFR SID detector: test data
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2 =========================================
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3
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4 The test sequence generated here consists of 175 frames in total:
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6 1 perfect (error-free) SID frame: should classify as SID=2
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7 95 frames with 1 bit in the SID field cleared: should classify as SID=2
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8 48 frames with 2 bits in the SID field cleared: should classify as SID=1
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9 11 frames with 15 bits in the SID field cleared: should classify as SID=1
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10 20 frames with 16 bits in the SID field cleared: should classify as SID=0
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11
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12 (The error-free SID frame used as the starting point is frame #71 from
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13 dtx01.cod in the official test sequence set from ETSI.)
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14
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15 The goal is to ensure perfect agreement among the following parties:
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16
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17 * The program used to generate these test frames;
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18 * EFR_sid_classify() function in Themyscira libgsmefr;
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19 * osmo_efr_sid_classify() function in libosmocodec (part of libosmocore);
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20 * SID classification performed by TI Calypso DSP;
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21 * SID classification performed by Nokia InSite BTS (E1 Abis output).
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22
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23 The official reference (source of truth) is GSM 06.62 spec for the definition
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24 of SID field bits and GSM 06.81 spec for SID classification thresholds; all
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25 implementations listed above are supposed to follow these spec definitions.
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26 However, any time a human developer has to read a spec and write code based on
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27 that spec, errors can occur at any step in that process; a cross-check between
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28 our implementation and those made by others before us provides an important
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29 assurance of correctness.
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31 The test frames generated here have been chosen with the goal of maximizing
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32 the chance of catching errors in these two areas:
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33
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34 * Wrong bits being set by tools aiming to generate or corrupt the SID field,
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35 or wrong bits being checked by the SID detector;
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36 * Wrong thresholds being applied for SID classification.
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37
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38 The generator program in this directory and Themyscira libgsmefr were already
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39 in agreement since the beginning of this test data project. The test sequence
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40 generated in this directory has now been tested on TI Calypso DSP (fed via TCH
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41 DL) and on Nokia InSite BTS (fed via TCH UL); both of these pre-existing
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42 historical implementations of TCH Rx produce SID classifications that are
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43 identical to our expectations. The present set of test patterns has also been
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44 added as a unit test to libosmocore, regression-testing osmo_efr_sid_classify()
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45 function.