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annotate libtwamr/c3_14pf.h @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 5fc9a2d12048
children
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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 : c3_14pf.h
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11 * Purpose : Searches a 14 bit algebraic codebook containing 3 pulses
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12 * in a frame of 40 samples.
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13 *
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14 ********************************************************************************
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15 */
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16 #ifndef c3_14pf_h
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17 #define c3_14pf_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 * LOCAL VARIABLES AND TABLES
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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 ********************************************************************************
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34 * DEFINITION OF DATA TYPES
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35 ********************************************************************************
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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 * DECLARATION OF PROTOTYPES
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41 ********************************************************************************
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42 */
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43 /*************************************************************************
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44 *
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45 * FUNCTION: code_3i40_14bits()
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46 *
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47 * PURPOSE: Searches a 14 bit algebraic codebook containing 3 pulses
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48 * in a frame of 40 samples.
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49 *
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50 * DESCRIPTION:
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51 * The code length is 40, containing 3 nonzero pulses: i0...i2.
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52 * All pulses can have two possible amplitudes: +1 or -1.
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53 * Pulse i0 can have 8 possible positions, pulses i1 and i2 can have
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54 * 2x8=16 positions.
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55 *
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56 * i0 : 0, 5, 10, 15, 20, 25, 30, 35.
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57 * i1 : 1, 6, 11, 16, 21, 26, 31, 36.
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58 * 3, 8, 13, 18, 23, 28, 33, 38.
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59 * i2 : 2, 7, 12, 17, 22, 27, 32, 37.
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60 * 4, 9, 14, 19, 24, 29, 34, 39.
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61 *
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62 *************************************************************************/
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63
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64 Word16 code_3i40_14bits(
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65 Word16 x[], /* (i) : target vector */
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66 Word16 h[], /* (i) : impulse response of weighted synthesis filter */
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67 /* h[-L_subfr..-1] must be set to zero. */
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68 Word16 T0, /* (i) : Pitch lag */
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69 Word16 pitch_sharp, /* (i) : Last quantized pitch gain */
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70 Word16 code[], /* (o) : Innovative codebook */
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71 Word16 y[], /* (o) : filtered fixed codebook excitation */
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72 Word16 * sign /* (o) : Signs of 3 pulses */
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73 );
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74
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75 #endif