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annotate libtwamr/q_gain_c.h @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 3a25bdfad0d8
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3a25bdfad0d8 libtwamr: integrate q_gain_c.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 : q_gain_c.h
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11 * Purpose : Scalar quantization of the innovative
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12 * : codebook gain.
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13 *
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14 ********************************************************************************
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15 */
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16 #ifndef q_gain_c_h
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17 #define q_gain_c_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 "tw_amr.h"
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25 #include "typedef.h"
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26 #include "gc_pred.h"
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27
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28 /*
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29 ********************************************************************************
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30 * DECLARATION OF PROTOTYPES
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31 ********************************************************************************
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32 */
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33
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34 /*--------------------------------------------------------------------------*
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35 * Function q_gain_code() *
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36 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ *
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37 * Scalar quantization of the innovative codebook gain. *
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38 * *
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39 * gc_pred() is used for MA prediction of the innovation energy *
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40 *--------------------------------------------------------------------------*/
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41 Word16 q_gain_code ( /* o : quantization index, Q0 */
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42 enum Mode mode, /* i : AMR mode */
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43 Word16 exp_gcode0, /* i : predicted CB gain (exponent), Q0 */
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44 Word16 frac_gcode0, /* i : predicted CB gain (fraction), Q15 */
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45 Word16 *gain, /* i/o: quantized fixed codebook gain, Q1 */
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46 Word16 *qua_ener_MR122, /* o : quantized energy error, Q10 */
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47 /* (for MR122 MA predictor update) */
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48 Word16 *qua_ener /* o : quantized energy error, Q10 */
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49 /* (for other MA predictor update) */
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50 );
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51
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52 #endif