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annotate libtwamr/autocorr.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 54f6bc41ed10
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 : autocorr.h
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11 * Purpose : Compute autocorrelations of signal with windowing
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef autocorr_h
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16 #define autocorr_h "$Id $"
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17
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18 /*
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19 ********************************************************************************
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20 * INCLUDE FILES
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21 ********************************************************************************
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22 */
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23 #include "typedef.h"
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24
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25 /*
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26 ********************************************************************************
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27 * DEFINITION OF DATA TYPES
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28 ********************************************************************************
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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 * DECLARATION OF PROTOTYPES
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34 ********************************************************************************
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35 */
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36 /*
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37 **************************************************************************
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38 *
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39 * Function : autocorr
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40 * Purpose : Compute autocorrelations of signal with windowing
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41 * Description : - Windowing of input speech: s'[n] = s[n] * w[n]
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42 * - Autocorrelations of input speech:
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43 * r[k] = sum_{i=k}^{239} s'[i]*s'[i-k] k=0,...,10
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44 * The autocorrelations are expressed in normalized
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45 * double precision format.
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46 * Returns : Autocorrelation
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47 *
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48 **************************************************************************
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49 */
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50 Word16 Autocorr (
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51 Word16 x[], /* (i) : Input signal (L_WINDOW) */
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52 Word16 m, /* (i) : LPC order */
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53 Word16 r_h[], /* (o) : Autocorrelations (msb) (MP1) */
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54 Word16 r_l[], /* (o) : Autocorrelations (lsb) (MP1) */
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55 const Word16 wind[]/* (i) : window for LPC analysis. (L_WINDOW) */
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56 );
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57
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58 #endif