FreeCalypso > hg > gsm-codec-lib
annotate libtwamr/dec_lag3.h @ 452:6e595f7d40e2
CHANGES: document changes for the upcoming release
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 10 May 2024 03:45:47 +0000 |
parents | fb001496ca8c |
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libtwamr: integrate dec_lag3.c
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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 : dec_lag3.h |
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11 * Purpose : Decoding of fractional pitch lag with 1/3 resolution. |
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12 * Extract the integer and fraction parts of the pitch lag from |
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13 * the received adaptive codebook index. |
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14 * |
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15 ******************************************************************************** |
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16 */ |
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17 #ifndef dec_lag3_h |
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18 #define dec_lag3_h "$Id $" |
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19 |
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20 /* |
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21 ******************************************************************************** |
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22 * INCLUDE FILES |
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23 ******************************************************************************** |
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24 */ |
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25 #include "typedef.h" |
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26 |
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27 /* |
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28 ******************************************************************************** |
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29 * LOCAL VARIABLES AND TABLES |
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30 ******************************************************************************** |
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31 */ |
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32 |
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33 /* |
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34 ******************************************************************************** |
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35 * DEFINITION OF DATA TYPES |
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36 ******************************************************************************** |
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37 */ |
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38 |
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39 /* |
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40 ******************************************************************************** |
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41 * DECLARATION OF PROTOTYPES |
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42 ******************************************************************************** |
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43 */ |
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44 /************************************************************************* |
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45 * FUNCTION: Dec_lag3 |
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46 * |
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47 * PURPOSE: Decoding of fractional pitch lag with 1/3 resolution. |
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48 * Extract the integer and fraction parts of the pitch lag from |
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49 * the received adaptive codebook index. |
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50 * |
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51 * See "Enc_lag3.c" for more details about the encoding procedure. |
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52 * |
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53 * The fractional lag in 1st and 3rd subframes is encoded with 8 bits |
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54 * while that in 2nd and 4th subframes is relatively encoded with 4, 5 |
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55 * and 6 bits depending on the mode. |
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56 * |
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57 *************************************************************************/ |
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58 void Dec_lag3(Word16 index, /* i : received pitch index */ |
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59 Word16 T0_min, /* i : minimum of search range */ |
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60 Word16 T0_max, /* i : maximum of search range */ |
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61 Word16 i_subfr, /* i : subframe flag */ |
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62 Word16 T0_prev, /* i : integer pitch delay of last subframe |
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63 used in 2nd and 4th subframes */ |
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64 Word16 * T0, /* o : integer part of pitch lag */ |
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65 Word16 * T0_frac, /* o : fractional part of pitch lag */ |
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66 Word16 flag4 /* i : flag for encoding with 4 bits */ |
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67 ); |
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68 |
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69 #endif |