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annotate libtwamr/lag_wind.tab @ 477:4c9222d95647

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libtwamr encoder: always emit frame->mode = mode; In the original implementation of amr_encode_frame(), the 'mode' member of the output struct was set to 0xFF if the output frame type is TX_NO_DATA. This design was made to mimic the mode field (16-bit word) being set to 0xFFFF (or -1) in 3GPP test sequence format - but nothing actually depends on this struct member being set in any way, and amr_frame_to_tseq() generates the needed 0xFFFF on its own, based on frame->type being equal to TX_NO_DATA. It is simpler and more efficient to always set frame->mode to the actual encoding mode in amr_encode_frame(), and this new behavior has already been documented in doc/AMR-library-API description in anticipation of the present change.
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 18 May 2024 22:30:42 +0000
parents a8dab7028e4d
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 : lag_wind.tab
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11 * Purpose : Table of lag_window for autocorrelation.
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12 * $Id $
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13 *
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14 ********************************************************************************
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15 */
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16 /*-----------------------------------------------------*
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17 | Table of lag_window for autocorrelation. |
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18 | |
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19 | noise floor = 1.0001 = (0.9999 on r[1] ..r[10]) |
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20 | Bandwitdh expansion = 60 Hz |
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21 | |
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22 | |
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23 | lag_wind[0] = 1.00000000 (not stored) |
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24 | lag_wind[1] = 0.99879038 |
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25 | lag_wind[2] = 0.99546897 |
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26 | lag_wind[3] = 0.98995781 |
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27 | lag_wind[4] = 0.98229337 |
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28 | lag_wind[5] = 0.97252619 |
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29 | lag_wind[6] = 0.96072036 |
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30 | lag_wind[7] = 0.94695264 |
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31 | lag_wind[8] = 0.93131179 |
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32 | lag_wind[9] = 0.91389757 |
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33 | lag_wind[10]= 0.89481968 |
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34 -----------------------------------------------------*/
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35
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36 static const Word16 lag_h[10] =
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37 {
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38 32728,
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39 32619,
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46 29946,
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47 29321
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48 };
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49
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50 static const Word16 lag_l[10] =
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51 {
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52 11904,
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54 30720,
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55 25856,
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57 28992,
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58 24384,
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61 14784
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62 };