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annotate libtwamr/inter_36.h @ 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 838ed426bb76
children
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1 /*
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2 ********************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 ********************************************************************************
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9 *
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10 * File : inter_36.h
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11 * Purpose : Interpolating the normalized correlation
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12 * : with 1/3 or 1/6 resolution.
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13 *
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14 ********************************************************************************
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15 */
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16 #ifndef inter_36_h
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17 #define inter_36_h "$Id $"
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18
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19 /*
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20 ********************************************************************************
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21 * INCLUDE FILES
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22 ********************************************************************************
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23 */
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24 #include "typedef.h"
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25
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26 /*
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27 ********************************************************************************
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28 * DEFINITION OF DATA TYPES
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29 ********************************************************************************
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30 */
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31
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32 /*
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33 ********************************************************************************
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34 * DECLARATION OF PROTOTYPES
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35 ********************************************************************************
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36 */
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37 Word16 Interpol_3or6 ( /* (o) : interpolated value */
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38 Word16 *x, /* (i) : input vector */
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39 Word16 frac, /* (i) : fraction (-2..2 for 3*, -3..3 for 6*) */
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40 Word16 flag3 /* (i) : if set, upsampling rate = 3 (6 otherwise) */
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41 );
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42
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43 #endif