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annotate libtwamr/ol_ltp.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 f17e42c63058
children
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f17e42c63058 libtwamr: integrate ol_ltp.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 : ol_ltp.h
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11 * Purpose : Compute the open loop pitch lag.
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef ol_ltp_h
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16 #define ol_ltp_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 "p_ol_wgh.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 int ol_ltp(
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33 pitchOLWghtState *st, /* i/o : State struct */
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34 vadState *vadSt, /* i/o : VAD state struct */
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35 enum Mode mode, /* i : coder mode */
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36 Word16 wsp[], /* i : signal used to compute the OL pitch, Q0 */
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37 /* uses signal[-pit_max] to signal[-1] */
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38 Word16 *T_op, /* o : open loop pitch lag, Q0 */
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39 Word16 old_lags[], /* i : history with old stored Cl lags */
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40 Word16 ol_gain_flg[], /* i : OL gain flag */
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41 Word16 idx, /* i : index */
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42 Flag dtx /* i : dtx flag; use dtx=1, do not use dtx=0 */
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43 );
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44 #endif