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annotate libtwamr/qgain795.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 2aa98051d445
children
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2aa98051d445 libtwamr: integrate qgain795.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 : qgain795.h
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11 * Purpose : (pre-) quantization of pitch gain for MR795
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12 *
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13 ********************************************************************************
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14 */
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15 #ifndef qgain795_h
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16 #define qgain795_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 "typedef.h"
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24 #include "g_adapt.h"
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25
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26 /*
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27 ********************************************************************************
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28 * DECLARATION OF PROTOTYPES
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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 * FUNCTION: MR795_gain_quant
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35 *
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36 * PURPOSE: pitch and codebook quantization for MR795
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37 *
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38 *************************************************************************/
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39 void
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40 MR795_gain_quant(
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41 GainAdaptState *adapt_st, /* i/o: gain adapter state structure */
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42 Word16 res[], /* i : LP residual, Q0 */
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43 Word16 exc[], /* i : LTP excitation (unfiltered), Q0 */
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44 Word16 code[], /* i : CB innovation (unfiltered), Q13 */
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45 Word16 frac_coeff[], /* i : coefficients (5), Q15 */
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46 Word16 exp_coeff[], /* i : energy coefficients (5), Q0 */
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47 /* coefficients from calc_filt_ener() */
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48 Word16 exp_code_en, /* i : innovation energy (exponent), Q0 */
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49 Word16 frac_code_en, /* i : innovation energy (fraction), Q15 */
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50 Word16 exp_gcode0, /* i : predicted CB gain (exponent), Q0 */
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51 Word16 frac_gcode0, /* i : predicted CB gain (fraction), Q15 */
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52 Word16 L_subfr, /* i : Subframe length */
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53 Word16 cod_gain_frac, /* i : opt. codebook gain (fraction),Q15 */
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54 Word16 cod_gain_exp, /* i : opt. codebook gain (exponent), Q0 */
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55 Word16 gp_limit, /* i : pitch gain limit */
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56 Word16 *gain_pit, /* i/o: Pitch gain (unquant/quant), Q14 */
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57 Word16 *gain_cod, /* o : Code gain, Q1 */
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58 Word16 *qua_ener_MR122, /* o : quantized energy error, Q10 */
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59 /* (for MR122 MA predictor update) */
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60 Word16 *qua_ener, /* o : quantized energy error, Q10 */
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61 /* (for other MA predictor update) */
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62 Word16 **anap /* o : Index of quantization */
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63 /* (first gain pitch, then code pitch)*/
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64 );
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65
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66 #endif