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annotate libtwamr/set_sign.h @ 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 15c354f75110
children
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15c354f75110 libtwamr: integrate set_sign.c
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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 : set_sign.h
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11 * Purpose : Builds sign vector according to "dn[]" and "cn[]".
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12 *
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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 * MODULE INCLUDE FILE AND VERSION ID
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18 ********************************************************************************
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19 */
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20 #ifndef set_sign_h
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21 #define set_sign_h "@(#)$Id $"
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22 /*
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23 ********************************************************************************
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24 * INCLUDE FILES
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25 ********************************************************************************
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26 */
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27 #include "typedef.h"
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28
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29 /*
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30 ********************************************************************************
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31 * DECLARATION OF PROTOTYPES
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32 ********************************************************************************
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33 */
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34 void set_sign(Word16 dn[], /* i/o : correlation between target and h[] */
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35 Word16 sign[], /* o : sign of dn[] */
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36 Word16 dn2[], /* o : maximum of correlation in each track. */
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37 Word16 n /* i : # of maximum correlations in dn2[] */
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38 );
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39
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40 void set_sign12k2 (
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41 Word16 dn[], /* i/o : correlation between target and h[] */
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42 Word16 cn[], /* i : residual after long term prediction */
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43 Word16 sign[], /* o : sign of d[n] */
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44 Word16 pos_max[], /* o : position of maximum correlation */
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45 Word16 nb_track, /* i : number of tracks tracks */
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46 Word16 ipos[], /* o : starting position for each pulse */
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47 Word16 step /* i : the step size in the tracks */
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48 );
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49
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50 #endif