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comparison libtwamr/ietf_in.c @ 441:ebe499058c63

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libtwamr: implement API functions for RFC 4867 I/O
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 09 May 2024 07:06:31 +0000
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440:bc736a8654af 441:ebe499058c63
1 /*
2 * The function implemented in this module is responsible for parsing
3 * an incoming RFC 4867 payload and turning it into struct amr_param_frame
4 * for decoding.
5 */
6
7 #include <stdint.h>
8 #include "tw_amr.h"
9 #include "typedef.h"
10 #include "namespace.h"
11 #include "cnst.h"
12 #include "int_defs.h"
13 #include "if1_func.h"
14
15 int amr_frame_from_ietf(const uint8_t *bytes, struct amr_param_frame *frame)
16 {
17 Word16 ft, q, sti;
18 Word16 serial[MAX_SERIAL_SIZE];
19
20 ft = (bytes[0] & 0x78) >> 3;
21 q = (bytes[0] & 0x04) >> 2;
22 if (ft == AMR_FT_NODATA) {
23 frame->type = RX_NO_DATA;
24 frame->mode = 0xFF;
25 return 0;
26 }
27 if (ft > MRDTX)
28 return -1;
29 if1_unpack_bytes(ft, bytes + 1, serial);
30 Bits2prm(ft, serial, frame->param);
31 if (ft != MRDTX) {
32 frame->type = q ? RX_SPEECH_GOOD : RX_SPEECH_BAD;
33 frame->mode = ft;
34 } else {
35 sti = (bytes[5] & 0x10) >> 4;
36 frame->mode = 0;
37 if (bytes[5] & 0x08)
38 frame->mode |= 1;
39 if (bytes[5] & 0x04)
40 frame->mode |= 2;
41 if (bytes[5] & 0x02)
42 frame->mode |= 4;
43 if (q)
44 frame->type = sti ? RX_SID_UPDATE : RX_SID_FIRST;
45 else
46 frame->type = RX_SID_BAD;
47 }
48 return 0;
49 }