FreeCalypso > hg > themwi-system-sw
comparison doc/Codec-library-depend @ 171:4f1f3f799295
doc/Codec-library-depend: article written
| author | Mychaela Falconia <falcon@freecalypso.org> |
|---|---|
| date | Mon, 21 Nov 2022 01:01:39 -0800 |
| parents | |
| children | 623c64ae6102 |
comparison
equal
deleted
inserted
replaced
| 170:a6eb2de277f6 | 171:4f1f3f799295 |
|---|---|
| 1 One important component of Themyscira Wireless system sw, specifically | |
| 2 themwi-mgw, implements speech transcoding between GSM codecs on the inside and | |
| 3 G.711 on the outside. This essential function creates a dependency on some | |
| 4 specialized libraries that implement the codecs which need to be supported. | |
| 5 The following codec libraries are currently required: | |
| 6 | |
| 7 1) libgsm, the original GSM 06.10 implementation from 1990s; | |
| 8 | |
| 9 2) gsm-codec-lib developed by Mother Mychaela: | |
| 10 | |
| 11 https://www.freecalypso.org/hg/gsm-codec-lib/ | |
| 12 | |
| 13 This gsm-codec-lib collection provides two libraries; as of this writing, one | |
| 14 is already implemented while the other is in the plans: | |
| 15 | |
| 16 2a) libgsmfrp is the Rx DTX handler for the original FR codec, a front-end | |
| 17 preprocessor that sits in front of libgsm decoder. This preprocessor | |
| 18 implements functions specified in GSM 06.11, 06.12 and 06.13, and these | |
| 19 functions are required (not optional) for a network-side implementation of | |
| 20 GSM FR codec in a TRAU-like component. | |
| 21 | |
| 22 2b) libgsmefr will be a librified (turned into a library) version of the | |
| 23 official reference implementation (from ETSI) of GSM EFR codec. |