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annotate libtwamr/dhf_check.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 9beb01439a90
children
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9beb01439a90 libtwamr: implement DHF check function
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1 /*
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2 * This module implements the DHF checking function.
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3 */
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4
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5 #include <stdint.h>
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6 #include <string.h>
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7 #include "tw_amr.h"
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8 #include "typedef.h"
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9 #include "namespace.h"
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10 #include "bitno.h"
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11
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12 static const Word16 * const dhf_per_mode[8] = {
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13 amr_dhf_mr475,
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14 amr_dhf_mr515,
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15 amr_dhf_mr59,
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16 amr_dhf_mr67,
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17 amr_dhf_mr74,
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18 amr_dhf_mr795,
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19 amr_dhf_mr102,
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20 amr_dhf_mr122
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21 };
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22
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23 int amr_check_dhf(const struct amr_param_frame *frame, int first_sub_only)
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24 {
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25 const Word16 *table;
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26 Word16 nparam;
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27
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28 if (frame->type != RX_SPEECH_GOOD)
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29 return 0;
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30 if ((frame->mode & 0x87) == 0x87)
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31 table = amr_dhf_gsmefr;
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32 else
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33 table = dhf_per_mode[frame->mode & 7];
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34 if (first_sub_only)
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35 nparam = prmnofsf[frame->mode & 7];
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36 else
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37 nparam = prmno[frame->mode & 7];
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38 if (memcmp(frame->param, table, nparam * sizeof(int16_t)))
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39 return 0;
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40 else
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41 return 1;
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42 }