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annotate libtwamr/ietf_in.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 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 parsing
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3 * an incoming RFC 4867 payload and turning it into struct amr_param_frame
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4 * for decoding.
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5 */
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6
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7 #include <stdint.h>
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8 #include "tw_amr.h"
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9 #include "typedef.h"
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10 #include "namespace.h"
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11 #include "cnst.h"
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12 #include "int_defs.h"
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13 #include "if1_func.h"
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14
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15 int amr_frame_from_ietf(const uint8_t *bytes, struct amr_param_frame *frame)
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16 {
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17 Word16 ft, q, sti;
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18 Word16 serial[MAX_SERIAL_SIZE];
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19
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20 ft = (bytes[0] & 0x78) >> 3;
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21 q = (bytes[0] & 0x04) >> 2;
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22 if (ft == AMR_FT_NODATA) {
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23 frame->type = RX_NO_DATA;
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24 frame->mode = 0xFF;
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25 return 0;
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26 }
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27 if (ft > MRDTX)
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28 return -1;
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29 if1_unpack_bytes(ft, bytes + 1, serial);
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30 Bits2prm(ft, serial, frame->param);
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31 if (ft != MRDTX) {
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32 frame->type = q ? RX_SPEECH_GOOD : RX_SPEECH_BAD;
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33 frame->mode = ft;
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34 } else {
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35 sti = (bytes[5] & 0x10) >> 4;
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36 frame->mode = 0;
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37 if (bytes[5] & 0x08)
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38 frame->mode |= 1;
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39 if (bytes[5] & 0x04)
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40 frame->mode |= 2;
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41 if (bytes[5] & 0x02)
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42 frame->mode |= 4;
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43 if (q)
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44 frame->type = sti ? RX_SID_UPDATE : RX_SID_FIRST;
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45 else
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46 frame->type = RX_SID_BAD;
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47 }
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48 return 0;
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49 }