FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/hp_max.h @ 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 | 176a44ff94a1 |
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rev | line source |
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1 /* |
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2 ******************************************************************************** |
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3 * |
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001 |
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5 * R99 Version 3.3.0 |
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6 * REL-4 Version 4.1.0 |
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7 * |
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8 ******************************************************************************** |
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9 * |
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10 * File : hp_max.h |
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11 * Purpose : Find the maximum correlation of scal_sig[] in a given |
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12 * delay range. |
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13 * |
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14 ******************************************************************************** |
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15 */ |
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16 #ifndef hp_max_h |
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17 #define hp_max_h "$Id $" |
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18 |
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19 /* |
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20 ******************************************************************************** |
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21 * INCLUDE FILES |
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22 ******************************************************************************** |
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23 */ |
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24 #include "typedef.h" |
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25 |
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26 /* |
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27 ******************************************************************************** |
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28 * DECLARATION OF PROTOTYPES |
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29 ******************************************************************************** |
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30 */ |
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31 /************************************************************************* |
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32 * |
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33 * FUNCTION: hp_max |
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34 * |
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35 * PURPOSE: Find the maximum high-pass filtered correlation of |
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36 * signal scal_sig[] in a given delay range. |
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37 * |
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38 * DESCRIPTION: |
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39 * The correlation is given by |
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40 * corr[t] = <scal_sig[n],scal_sig[n-t]>, t=lag_min,...,lag_max |
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41 * The functions outputs the maximum high-pass filtered correlation |
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42 * after normalization. |
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43 * |
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44 *************************************************************************/ |
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45 Word16 hp_max ( |
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46 Word32 corr[], /* i : correlation vector. */ |
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47 Word16 scal_sig[], /* i : scaled signal. */ |
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48 Word16 L_frame, /* i : length of frame to compute pitch */ |
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49 Word16 lag_max, /* i : maximum lag */ |
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50 Word16 lag_min, /* i : minimum lag */ |
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51 Word16 *cor_hp_max /* o : max high-pass filtered norm. correlation */ |
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52 ); |
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53 #endif |