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annotate libtwamr/e_homing.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 2a094af3d384
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 : e_homing.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 * MODULE INCLUDE FILE AND VERSION ID
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18 *****************************************************************************
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19 */
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20
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21 #include "namespace.h"
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22 #include "e_homing.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
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30 #include "typedef.h"
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31 #include "cnst.h"
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32
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33 /*
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34 *****************************************************************************
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35 * PUBLIC PROGRAM CODE
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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 ********************************************************************************
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41 *
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42 * Function : encoder_homing_frame_test
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43 * In : input_frame[] one frame of speech samples
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44 * Out : none
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45 * Calls : none
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46 * Tables : none
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47 * Compile Defines : none
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48 * Return : 0 input frame does not match the encoder homing frame pattern
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49 * 1 input frame matches the encoder homing frame pattern
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50 * Information : Checks if all samples of the input frame matches the encoder
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51 * homing frame pattern, which is 0x0008 for all samples.
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52 *
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53 ********************************************************************************
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54 */
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55
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56 Word16 encoder_homing_frame_test (const Word16 input_frame[])
361
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57 {
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58 Word16 i, j;
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59
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60 /* check 160 input samples for matching EHF_MASK: defined in e_homing.h */
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61 for (i = 0; i < L_FRAME; i++)
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62 {
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63 j = input_frame[i] ^ EHF_MASK;
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64
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65 if (j)
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66 break;
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67 }
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68
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69 return !j;
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70 }