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annotate libtwamr/lsp_lsf.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 05a46720af0f
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 : lsp_lsf.h
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11 * Purpose : Lsp_lsf: Transformation lsp to lsf
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12 * : Lsf_lsp: Transformation lsf to lsp
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13 *
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14 ********************************************************************************
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15 */
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16 #ifndef lsp_lsf_h
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17 #define lsp_lsf_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 void Lsf_lsp (
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38 Word16 lsf[], /* (i) : lsf[m] normalized (range: 0.0<=val<=0.5) */
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39 Word16 lsp[], /* (o) : lsp[m] (range: -1<=val<1) */
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40 Word16 m /* (i) : LPC order */
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41 );
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42 void Lsp_lsf (
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43 Word16 lsp[], /* (i) : lsp[m] (range: -1<=val<1) */
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44 Word16 lsf[], /* (o) : lsf[m] normalized (range: 0.0<=val<=0.5) */
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45 Word16 m /* (i) : LPC order */
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46 );
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47
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48 #endif