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author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 17 Apr 2024 20:53:10 +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.