FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/ietf_in.c @ 465:026bdc1f0dda
amrefr-tseq-enc: use the new DHF xform that matches T-Mobile
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 12 May 2024 21:43:35 +0000 |
parents | ebe499058c63 |
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rev | line source |
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libtwamr: implement API functions for RFC 4867 I/O
Mychaela Falconia <falcon@freecalypso.org>
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1 /* |
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libtwamr: implement API functions for RFC 4867 I/O
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2 * The function implemented in this module is responsible for parsing |
ebe499058c63
libtwamr: implement API functions for RFC 4867 I/O
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3 * an incoming RFC 4867 payload and turning it into struct amr_param_frame |
ebe499058c63
libtwamr: implement API functions for RFC 4867 I/O
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4 * for decoding. |
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libtwamr: implement API functions for RFC 4867 I/O
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5 */ |
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libtwamr: implement API functions for RFC 4867 I/O
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6 |
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7 #include <stdint.h> |
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libtwamr: implement API functions for RFC 4867 I/O
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8 #include "tw_amr.h" |
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libtwamr: implement API functions for RFC 4867 I/O
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9 #include "typedef.h" |
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libtwamr: implement API functions for RFC 4867 I/O
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10 #include "namespace.h" |
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libtwamr: implement API functions for RFC 4867 I/O
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11 #include "cnst.h" |
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libtwamr: implement API functions for RFC 4867 I/O
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12 #include "int_defs.h" |
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libtwamr: implement API functions for RFC 4867 I/O
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13 #include "if1_func.h" |
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libtwamr: implement API functions for RFC 4867 I/O
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14 |
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libtwamr: implement API functions for RFC 4867 I/O
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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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libtwamr: implement API functions for RFC 4867 I/O
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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 } |