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doc/Voice-memo-utils: new article
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 29 Dec 2022 21:03:11 +0000
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Mychaela Falconia <falcon@freecalypso.org>
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1 The full Calypso hw+fw solution as delivered by TI (the relevant components here
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2 are the DSP, the official L1 code and RiViera Audio Service) implements an
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Mychaela Falconia <falcon@freecalypso.org>
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3 interesting feature called voice memos. The voice memo feature itself, plus
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4 FreeCalypso-added AT commands that exercise it, are described in the
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5 Voice-memo-feature article in our separate freecalypso-docs repository; the
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6 present document describes the available FC host tools utilities for working
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7 with these voice memo recordings.
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8
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9 FreeCalypso tools for decoding voice memo files
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10 ===============================================
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11
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12 If you have recorded a voice memo with AT@VMR and then read it out with fc-fsio,
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13 you can use additional FC tools to analyze it. The following tools are
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14 available, split between FC host tools and GSM codec libs & utilities packages:
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15
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16 * fc-vm2gsmx (new with fc-host-tools-r18) takes a binary VM recording (as you
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17 would read out with fc-fsio) and converts it into extended-libgsm (gsmx)
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18 format defined in our GSM codec libraries & utilities package. This gsmx
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19 format is an extension of the classic libgsm (GSM 06.10) format, adding the
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20 possibility of SID frames and BFI markers (frame gaps) in addition to regular
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21 speech frames, thus it can represent the content of a voice memo recording
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22 made in DTX mode. These gsmx files can then be decoded into playable WAV
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23 with our gsmfr-decode utility.
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24
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25 * fc-vm2hex (dates back to fc-host-tools-r5) converts a binary VM recording into
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26 ASCII hex format, similar to the old (2016) TCH DL recording format before it
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27 was extended in late 2022. Every fully-written frame is emitted in the hex
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28 output as 3 space-separated hex status words followed by a block of 66 hex
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29 digits giving the FR1 codec frame in the unchanged bit order of TI's DSP, and
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30 every skipped frame (one for which only status word 0 was written into the
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31 memo file) is emitted in the hex output as just that one word. The hex output
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Mychaela Falconia <falcon@freecalypso.org>
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32 from fc-vm2hex can be further fed to gsmfr-dlcap-parse utility (gsm-codec-lib
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33 package) for deeper analysis.
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34
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35 FreeCalypso tools for external generation of voice memo files
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36 =============================================================
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37
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38 Using FreeCalypso tools, you can produce an external speech recording in GSM
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39 06.10 FR1 codec format, convert it into TCS211 VM format, upload it into FC
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40 device FFS with fc-fsio, and then play these externally-produced voice memos
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Mychaela Falconia <falcon@freecalypso.org>
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41 with AT@VMP. The steps are as follows:
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42
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43 1) You can use gsmfr-encode to FR1-encode a speech sample from WAV into classic
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Mychaela Falconia <falcon@freecalypso.org>
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44 .gsm format, or gsmfr-encode-r if the source is raw BE instead of WAV.
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45 Alternatively, you can use any other off-the-shelf software that can encode
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46 FR1 and write libgsm format; SoX shipped with Slackware includes the
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Mychaela Falconia <falcon@freecalypso.org>
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47 necessary support.
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48
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49 2) fc-gsm2vm (unchanged since fc-host-tools-r5) converts a .gsm recording into
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50 non-DTX TCS211 VM format.
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51
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52 At the present time we don't have any tools for producing external DTX-enabled
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53 VM recordings: the main limitation is that at least to this Mother's knowledge,
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54 the published source software community does not currently possess a GSM 06.10
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55 encoding library that has been extended with VAD and DTX functions. There is
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56 classic libgsm from 1990s, used by everyone in the FOSS community who needs a
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57 GSM 06.10 encoder or decoder, but it doesn't do DTX; we (FreeCalypso and
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58 Themyscira Wireless) have produced our own libgsmfrp front-end that implements
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59 Rx DTX handler functions (that's how we can properly decode FR1 streams that
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60 contain SIDs and/or missing frames), but it doesn't help with DTX encoding.
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61 Therefore, our ability to produce TCS211-compatible VM recordings externally is
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62 currently limited to non-DTX mode.