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annotate doc/Codec-library-depend @ 199:e6c7ced3c031

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mgw: accept zero-length RTP payload as BFI Mainline OsmoBTS now has an option (rtp continuous-streaming) that causes it to emit an RTP packet every 20 ms without gaps, sending a BFI marker in the form of zero-length RTP payload when it has nothing else to send. These codec-independent BFI markers don't indicate TAF, but this provision is a good start. Accept this BFI packet format in themwi-mgw.
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 29 Mar 2023 20:23:43 -0800
parents 623c64ae6102
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1 One important component of Themyscira Wireless system sw, specifically
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2 themwi-mgw, implements speech transcoding between GSM codecs on the inside and
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3 G.711 on the outside. This essential function creates a dependency on some
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4 specialized libraries that implement the codecs which need to be supported.
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5 The following codec libraries are currently required:
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7 1) libgsm, the original GSM 06.10 implementation from 1990s;
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9 2) gsm-codec-lib developed by Mother Mychaela for Themyscira Wireless:
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11 https://www.freecalypso.org/hg/gsm-codec-lib/
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13 This gsm-codec-lib collection provides two libraries: libgsmefr and libgsmfrp.
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14 Both of these libraries are used by themwi-mgw as mandatory dependencies.