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annotate libtwamr/d_gain_p.c @ 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 e18452a4fbac
children
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e18452a4fbac libtwamr: integrate d_gain_p.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 : d_gain_p.c
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11 *
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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 #include "namespace.h"
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22 #include "d_gain_p.h"
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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 "tw_amr.h"
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30 #include "typedef.h"
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31 #include "basic_op.h"
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32 #include "oper_32b.h"
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33 #include "no_count.h"
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34 #include "cnst.h"
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35 #include "gains_tab.h"
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36
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37 /*
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38 ********************************************************************************
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39 * PUBLIC PROGRAM CODE
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40 ********************************************************************************
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41 */
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42
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43 /*
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44 **************************************************************************
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45 *
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46 * Function : d_gain_pitch
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47 * Purpose : Decodes the pitch gain using the received index.
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48 * output is in Q14
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49 *
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50 **************************************************************************
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51 */
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52 Word16 d_gain_pitch ( /* return value: gain (Q14) */
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53 enum Mode mode, /* i : AMR mode */
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54 Word16 index /* i : index of quantization */
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55 )
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56 {
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57 Word16 gain;
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58
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59 test ();
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60 if (sub(mode, MR122) == 0)
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61 {
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62 /* clear 2 LSBits */
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63 gain = shl (shr (qua_gain_pitch[index], 2), 2); move16 ();
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64 }
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65 else
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66 {
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67 gain = qua_gain_pitch[index]; move16 ();
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68 }
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69
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70 return gain;
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71 }