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annotate doc/EFR-testing @ 605:63f774192906

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gsmhr_decoder_twts002_in(): set BFI=1 SID=1 for invalid SID When a received TW-TS-002 RTP payload indicates invalid SID, which of the 3 possible BFI/SID combinations should we pass to our internal ETSI-based speech decoder or TFO engine? Our original code passed BFI=0 SID=1, but upon further reflection, BFI=1 SID=1 is a better choice. In the corner case where received invalid SID is fed to a full decoder in homed state, setting BFI=1 allows that decoder to emit zeros on PCM and stay homed, instead of launching into full decoding.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 04 Dec 2025 21:01:46 +0000
parents 1e8569000049
children
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3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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1 When it comes to codec libraries, testing for correctness is essential, and EFR
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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2 is no exception. There is a set of EFR encoder and decoder test sequences
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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3 published by ETSI in ts_100725v050200p0.zip (GSM 06.54), and our suite of tools
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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4 includes gsmefr-etsi-enc and gsmefr-etsi-dec test programs that operate on the
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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5 representation formats used by these test sequences. Because these test
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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6 programs are based on libgsmefr EFR_encode_frame() and EFR_decode_frame()
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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7 functions, seeing gsmefr-etsi-enc produce output that matches official ETSI
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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8 *.cod files proves that libgsmefr encoder is correct, and seeing gsmefr-etsi-dec
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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9 produce output that matches official ETSI *.out files proves that libgsmefr
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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10 decoder is correct.
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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12 For debugging, we also have gsmefr-cod-parse and gsmefr-dec-parse utilities that
3fd48946dcb8 doc/EFR-testing article written
Mychaela Falconia <falcon@freecalypso.org>
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13 parse ETSI *.cod and *.dec file formats and dump their content in human-readable
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170e03b20337 doc/EFR-testing (gsmefr-{cod,dec}-parse): document similarity to gsmrec-dump
Mychaela Falconia <falcon@freecalypso.org>
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14 form similar to gsmrec-dump.
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1e8569000049 doc/EFR-testing: document endian issues
Mychaela Falconia <falcon@freecalypso.org>
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1e8569000049 doc/EFR-testing: document endian issues
Mychaela Falconia <falcon@freecalypso.org>
parents: 134
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16 Please note that all ETSI test sequence file formats are endian-dependent: their
1e8569000049 doc/EFR-testing: document endian issues
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17 original programs read and write 16-bit words in the local machine's native byte
1e8569000049 doc/EFR-testing: document endian issues
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18 order, and whenever you are working with published test sequence files, you have
1e8569000049 doc/EFR-testing: document endian issues
Mychaela Falconia <falcon@freecalypso.org>
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19 to check to see if they are BE or LE. Our gsmefr-etsi-{enc,dec} and
1e8569000049 doc/EFR-testing: document endian issues
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parents: 134
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20 gsmefr-{cod,dec}-parse programs support both byte orders; the default is LE
1e8569000049 doc/EFR-testing: document endian issues
Mychaela Falconia <falcon@freecalypso.org>
parents: 134
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21 (matching the main parts of ts_100725v050200p0.zip), or you can select BE with
1e8569000049 doc/EFR-testing: document endian issues
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22 -b option.