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annotate libtwamr/pre_big.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 38ee82480462
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 : pre_big.h
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11 * Purpose : Big subframe (2 subframes) preprocessing
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef pre_big_h
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16 #define pre_big_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 "tw_amr.h"
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24 #include "typedef.h"
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25 #include "cnst.h"
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26
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27 /*
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28 ********************************************************************************
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29 * DECLARATION OF PROTOTYPES
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30 ********************************************************************************
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31 */
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32
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33 int pre_big(
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34 enum Mode mode, /* i : coder mode */
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35 const Word16 gamma1[], /* i : spectral exp. factor 1 */
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36 const Word16 gamma1_12k2[],/* i : spectral exp. factor 1 for EFR */
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37 const Word16 gamma2[], /* i : spectral exp. factor 2 */
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38 Word16 A_t[], /* i : A(z) unquantized, for 4 subframes, Q12 */
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39 Word16 frameOffset, /* i : Start position in speech vector, Q0 */
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40 Word16 speech[], /* i : speech, Q0 */
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41 Word16 mem_w[], /* i/o: synthesis filter memory state, Q0 */
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42 Word16 wsp[] /* o : weighted speech Q0 */
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43 );
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44
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45 #endif