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libgsmhr1/{pack,unpack}_frame.c: comment fix there is only one unvoiced mode, hence it should be singular
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 17 Aug 2024 21:45:34 +0000
parents cc0c244bd233
children
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1 The present suite includes a pair of command line programs that exercise
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2 libtwamr encoder and decoder in 3GPP test sequence format, allowing this library
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3 to be tested against the official test sequences of 3GPP TS 26.074.
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5 twamr-tseq-enc
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6 ==============
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8 This program reads a *.inp file from the collection of TS 26.074, encodes it
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9 per selected AMR mode using libtwamr functions, and emits the encoder output in
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10 3GPP-defined .cod format. The command line structure of twamr-tseq-enc is as
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11 follows:
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13 twamr-tseq-enc [-d] [-2] input.inp mode output.cod
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15 The middle argument specifies the codec mode to be used; there is no default.
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16 Ordinarily the mode argument is one of these 8 keywords:
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18 MR475
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27 However, this mode argument can also take the form of "file:$modefile", where
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28 $modefile is an ASCII text file giving one of the above mode keywords per line.
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29 This form is needed when testing the encoding of t21.inp per t21.mod control
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30 file.
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32 twamr-tseq-enc flag options: -d enables DTX, -2 switches the VAD algorithm from
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33 VAD1 default to VAD2 alternative. The two options can be combined as -d2.
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34
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35 twamr-tseq-dec
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36 ==============
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37
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38 This program reads a *.cod file in 3GPP AMR test sequence format, decodes it
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39 using libtwamr functions, and emits the decoder output in a raw PCM *.out file.
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40 The command line structure of twamr-tseq-dec is as follows:
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42 twamr-tseq-dec [-r] input.cod output.out
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43
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44 By default the first word of each *.cod frame is expected to be a Tx frame type
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45 as in enum TXFrameType; with -r option this first word is expected to be an Rx
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46 frame type as in enum RXFrameType instead. This option directly corresponds to
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47 -rxframetype in the reference decoder program from 3GPP.
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48
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49 Byte order considerations
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50 =========================
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51
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52 Both twamr-tseq-enc and twamr-tseq-dec read and write their input and output
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53 files (16-bit linear PCM on one end and 3GPP *.cod test sequence format on the
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54 other end) in the local machine's native byte order. 3GPP shipped their
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55 TS 26.074 collection of AMR test sequences in little-endian byte order; given
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56 that most GSM software developers are now largely forced by economic pressures
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57 to work on x86 or ARM architecture machines rather than more noble SPARC or
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58 PowerPC systems, the local byte order of the developer's machine will typically
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59 be LE, matching TS 26.074 files as published.