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annotate libtwamr/ietf_out.c @ 458:e26b974f7ba3

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doc/AMR-study-utils: update for the current situation
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 10 May 2024 18:45:36 +0000
parents ebe499058c63
children
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441
ebe499058c63 libtwamr: implement API functions for RFC 4867 I/O
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1 /*
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2 * The function implemented in this module is responsible for turning
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3 * struct amr_param_frame (encoder output) into an RFC 4867 payload.
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4 */
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5
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6 #include <stdint.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 "cnst.h"
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11 #include "int_defs.h"
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12 #include "if1_func.h"
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13
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14 static const uint8_t total_bytes_per_ft[9] =
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15 {13, 14, 16, 18, 20, 21, 27, 32, 6};
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16
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17 static const uint8_t first_octet_per_ft[9] =
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18 {0x04, 0x0C, 0x14, 0x1C, 0x24, 0x2C, 0x34, 0x3C, 0x44};
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19
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20 unsigned amr_frame_to_ietf(const struct amr_param_frame *frame, uint8_t *bytes)
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21 {
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22 Word16 serial[MAX_SERIAL_SIZE];
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23 Word16 sti;
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24 enum Mode ft;
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25
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26 switch (frame->type) {
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27 case TX_SPEECH_GOOD:
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28 ft = frame->mode;
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29 break;
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30 case TX_SID_FIRST:
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31 ft = MRDTX;
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32 sti = 0;
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33 break;
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34 case TX_SID_UPDATE:
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35 ft = MRDTX;
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36 sti = 1;
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37 break;
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38 case TX_NO_DATA:
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39 default:
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40 bytes[0] = 0x7C;
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41 return 1;
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42 }
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43 Prm2bits(ft, frame->param, serial);
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44 bytes[0] = first_octet_per_ft[ft];
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45 if1_pack_bytes(ft, serial, bytes + 1);
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46 if (ft == MRDTX) {
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47 if (sti)
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48 bytes[5] |= 0x10;
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49 if (frame->mode & 1)
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50 bytes[5] |= 0x08;
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51 if (frame->mode & 2)
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52 bytes[5] |= 0x04;
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53 if (frame->mode & 4)
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54 bytes[5] |= 0x02;
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55 }
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56 return total_bytes_per_ft[ft];
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57 }