FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/ietf_out.c @ 446:e2f824ffd08a
amrtest: implement twamr-decode-r
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 10 May 2024 00:30:39 +0000 |
parents | ebe499058c63 |
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rev | line source |
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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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libtwamr: implement API functions for RFC 4867 I/O
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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 } |