FreeCalypso > hg > gsm-codec-lib

comparison libtwamr/dec_lag3.h @ 357:fb001496ca8c

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
libtwamr: integrate dec_lag3.c
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 05 May 2024 22:29:09 +0000
parents
children
comparison
equal deleted inserted replaced
356:5ccfe176bae1 357:fb001496ca8c
1 /*
2 ********************************************************************************
3 *
4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
5 * R99 Version 3.3.0
6 * REL-4 Version 4.1.0
7 *
8 ********************************************************************************
9 *
10 * File : dec_lag3.h
11 * Purpose : Decoding of fractional pitch lag with 1/3 resolution.
12 * Extract the integer and fraction parts of the pitch lag from
13 * the received adaptive codebook index.
14 *
15 ********************************************************************************
16 */
17 #ifndef dec_lag3_h
18 #define dec_lag3_h "$Id $"
19
20 /*
21 ********************************************************************************
22 * INCLUDE FILES
23 ********************************************************************************
24 */
25 #include "typedef.h"
26
27 /*
28 ********************************************************************************
29 * LOCAL VARIABLES AND TABLES
30 ********************************************************************************
31 */
32
33 /*
34 ********************************************************************************
35 * DEFINITION OF DATA TYPES
36 ********************************************************************************
37 */
38
39 /*
40 ********************************************************************************
41 * DECLARATION OF PROTOTYPES
42 ********************************************************************************
43 */
44 /*************************************************************************
45 * FUNCTION: Dec_lag3
46 *
47 * PURPOSE: Decoding of fractional pitch lag with 1/3 resolution.
48 * Extract the integer and fraction parts of the pitch lag from
49 * the received adaptive codebook index.
50 *
51 * See "Enc_lag3.c" for more details about the encoding procedure.
52 *
53 * The fractional lag in 1st and 3rd subframes is encoded with 8 bits
54 * while that in 2nd and 4th subframes is relatively encoded with 4, 5
55 * and 6 bits depending on the mode.
56 *
57 *************************************************************************/
58 void Dec_lag3(Word16 index, /* i : received pitch index */
59 Word16 T0_min, /* i : minimum of search range */
60 Word16 T0_max, /* i : maximum of search range */
61 Word16 i_subfr, /* i : subframe flag */
62 Word16 T0_prev, /* i : integer pitch delay of last subframe
63 used in 2nd and 4th subframes */
64 Word16 * T0, /* o : integer part of pitch lag */
65 Word16 * T0_frac, /* o : fractional part of pitch lag */
66 Word16 flag4 /* i : flag for encoding with 4 bits */
67 );
68
69 #endif