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annotate libtwamr/g_adapt.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 2a265be82195
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 : g_adapt.h
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11 * Purpose : gain adaptation for MR795 gain quantization
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12 *
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13 ********************************************************************************
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14 */
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15
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16 /*
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17 ********************************************************************************
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18 * MODULE INCLUDE FILE AND VERSION ID
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19 ********************************************************************************
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20 */
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21 #ifndef g_adapt_h
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22 #define g_adapt_h "$Id $"
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23
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24 /*
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25 ********************************************************************************
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26 * INCLUDE FILES
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27 ********************************************************************************
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28 */
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29 #include "typedef.h"
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30
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31 #define LTPG_MEM_SIZE 5 /* number of stored past LTP coding gains + 1 */
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32
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33 /*
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34 ********************************************************************************
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35 * DEFINITION OF DATA TYPES
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36 ********************************************************************************
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37 */
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38 typedef struct {
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39 Word16 onset; /* onset state, Q0 */
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40 Word16 prev_alpha; /* previous adaptor output, Q15 */
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41 Word16 prev_gc; /* previous code gain, Q1 */
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42
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43 Word16 ltpg_mem[LTPG_MEM_SIZE]; /* LTP coding gain history, Q13 */
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44 /* (ltpg_mem[0] not used for history) */
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45 } GainAdaptState;
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46
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47 /*
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48 ********************************************************************************
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49 * DECLARATION OF PROTOTYPES
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50 ********************************************************************************
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51 */
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52
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53 void gain_adapt_reset (GainAdaptState *st);
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54 /* reset of gain adaptor state (i.e. set state memory to zero)
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55 returns 0 on success
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56 */
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57
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58 /*************************************************************************
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59 *
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60 * Function: gain_adapt()
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61 * Purpose: calculate pitch/codebook gain adaptation factor alpha
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62 * (and update the adaptor state)
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63 *
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64 **************************************************************************
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65 */
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66 void gain_adapt(
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67 GainAdaptState *st, /* i : state struct */
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68 Word16 ltpg, /* i : ltp coding gain (log2()), Q */
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69 Word16 gain_cod, /* i : code gain, Q13 */
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70 Word16 *alpha /* o : gain adaptation factor, Q15 */
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71 );
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72
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73 #endif