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annotate libtwamr/cbsearch.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 4614f1a97e1a
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 : cbsearch.h
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11 * Purpose : Inovative codebook search (find index and gain)
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12 *
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13 *****************************************************************************
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14 */
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15 #ifndef cbsearch_h
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16 #define cbsearch_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
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26 /*
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27 *****************************************************************************
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28 * LOCAL VARIABLES AND TABLES
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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 * DEFINITION OF DATA TYPES
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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 *****************************************************************************
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40 * PUBLIC PROGRAM CODE
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41 *****************************************************************************
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42 */
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43 int cbsearch(Word16 x[], /* i : target vector, Q0 */
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44 Word16 h[], /* i : impulse response of weighted synthesis */
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45 /* filter h[-L_subfr..-1] must be set to */
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46 /* zero. Q12 */
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47 Word16 T0, /* i : Pitch lag */
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48 Word16 pitch_sharp, /* i : Last quantized pitch gain, Q14 */
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49 Word16 gain_pit,/* i : Pitch gain, Q14 */
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50 Word16 res2[], /* i : Long term prediction residual, Q0 */
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51 Word16 code[], /* o : Innovative codebook, Q13 */
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52 Word16 y[], /* o : filtered fixed codebook excitation, Q12 */
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53 Word16 **anap, /* o : Signs of the pulses */
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54 enum Mode mode, /* i : coder mode */
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55 Word16 subNr) /* i : subframe number */
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56 ;
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57
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58 #endif