FreeCalypso > hg > gsm-codec-lib

annotate README @ 282:9ee8ad3d4d30

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frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 05:44:47 +0000
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1 Themyscira Wireless GSM codec libraries & utilities package
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2 ===========================================================
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4 Themyscira Wireless, a technical initiative of the Women's Republic of
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5 Themyscira, is proud to present this package of GSM codec libraries and
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6 associated command line test and development utilities. The present package
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7 provides two linkable C libraries, intended to be usable by any application
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8 that needs GSM codec functionality:
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10 libgsmefr An implementation of EFR codec in the same spirit as classic
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11 libgsm, i.e., like libgsm, but for EFR instead of 06.10. It is
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12 based on the reference code from ETSI.
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14 libgsmfrp An Rx DTX handler preprocessor to be invoked prior to
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15 gsm_decode() from classic libgsm, implementing GSM 06.11, 06.12
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16 and 06.31 functionality in the Rx direction.
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17
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18 These two libraries are intended primarily for use as part of GSM network
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19 deployment, i.e., as part of the necessary speech transcoder implementation in
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20 whichever network-side server process acts as the voice gateway to PSTN or
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21 other networks. However, they can also be used as part of development and
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22 testing on the mobile side of GSM: for example, to decode TCH downlink bits and
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23 voice memo recordings read out of FreeCalypso GSM MS devices, or to implement
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24 your own lab-oriented GSM MS on top of some other PHY.
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26 Each of these two Themyscira libraries (libgsmefr and libgsmfrp) is free-
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27 standing and independent of the other. libgsmfrp makes use of <gsm.h> header
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28 file from libgsm (for gsm_byte and gsm_frame defined types) and requires this
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29 header file in order to compile; libgsmefr has zero dependencies nominally but
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30 will often be used together with libgsm and libgsmfrp.
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32 Included command line utilities
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33 ===============================
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34
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35 In addition to the two main libraries, the present package includes a number of
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36 command line utilities, falling into the following groups:
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37
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38 * Some utilities specifically exercise and test the two core libraries;
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39
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40 * Some utilities are not specifically for library testing but make use of
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41 our libraries;
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43 * Some utilities are included because they implement some closely related and
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44 relevant debug and development functionality, even though they don't link
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45 with either libgsmefr or libgsmfrp.
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47 Please see the included documentation in the doc subdirectory.