FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/tseq_in.c @ 477:4c9222d95647
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> |
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date | Sat, 18 May 2024 22:30:42 +0000 |
parents | 3ce30a95769e |
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1 /* |
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2 * In this module we implement decoder input conversion from 3GPP |
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3 * test sequence format to our internal struct amr_param_frame. |
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4 */ |
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5 |
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6 #include <stdint.h> |
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7 #include <string.h> |
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8 #include "tw_amr.h" |
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9 #include "namespace.h" |
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10 #include "typedef.h" |
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11 #include "cnst.h" |
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12 #include "bits2prm.h" |
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13 |
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14 int amr_frame_from_tseq(const uint16_t *cod, int use_rxtype, |
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15 struct amr_param_frame *frame) |
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16 { |
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17 enum RXFrameType rx_type; |
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18 int rc; |
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19 |
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20 if (use_rxtype) { |
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21 if (cod[0] >= RX_N_FRAMETYPES) |
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22 return -1; |
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23 rx_type = cod[0]; |
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24 } else { |
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25 rc = amr_txtype_to_rxtype(cod[0], &rx_type); |
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26 if (rc < 0) |
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27 return -1; |
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28 } |
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29 frame->type = rx_type; |
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30 if (rx_type == RX_NO_DATA) { |
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31 frame->mode = 0xFF; |
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32 return 0; |
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33 } |
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34 if (cod[MAX_SERIAL_SIZE+1] > 7) |
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35 return -2; |
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36 frame->mode = cod[MAX_SERIAL_SIZE+1]; |
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37 switch (rx_type) { |
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38 case RX_SPEECH_GOOD: |
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39 case RX_SPEECH_DEGRADED: |
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40 case RX_SPEECH_BAD: |
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41 Bits2prm(frame->mode, cod + 1, frame->param); |
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42 break; |
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43 case RX_SID_UPDATE: |
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44 case RX_SID_BAD: |
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45 Bits2prm(MRDTX, cod + 1, frame->param); |
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46 break; |
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47 } |
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48 return 0; |
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49 } |