FreeCalypso > hg > gsm-codec-lib

annotate libtwamr/dec_lag3.h @ 521:68fe269b4316

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
gsmx-to-tw5a: actually write to the output file
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 19 Sep 2024 02:21:08 +0000
parents fb001496ca8c
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
357
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 *
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 * R99 Version 3.3.0
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 * REL-4 Version 4.1.0
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 *
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 *
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 * File : dec_lag3.h
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 * Purpose : Decoding of fractional pitch lag with 1/3 resolution.
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 * Extract the integer and fraction parts of the pitch lag from
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 * the received adaptive codebook index.
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 *
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 #ifndef dec_lag3_h
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 #define dec_lag3_h "$Id $"
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 /*
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 * INCLUDE FILES
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 #include "typedef.h"
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 /*
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 * LOCAL VARIABLES AND TABLES
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 /*
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 * DEFINITION OF DATA TYPES
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 /*
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 * DECLARATION OF PROTOTYPES
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 ********************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 /*************************************************************************
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 * FUNCTION: Dec_lag3
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 *
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 * PURPOSE: Decoding of fractional pitch lag with 1/3 resolution.
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 * Extract the integer and fraction parts of the pitch lag from
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 * the received adaptive codebook index.
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 *
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 * See "Enc_lag3.c" for more details about the encoding procedure.
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 *
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 * The fractional lag in 1st and 3rd subframes is encoded with 8 bits
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 * while that in 2nd and 4th subframes is relatively encoded with 4, 5
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 * and 6 bits depending on the mode.
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 *
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 *************************************************************************/
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 void Dec_lag3(Word16 index, /* i : received pitch index */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 Word16 T0_min, /* i : minimum of search range */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 Word16 T0_max, /* i : maximum of search range */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 Word16 i_subfr, /* i : subframe flag */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 Word16 T0_prev, /* i : integer pitch delay of last subframe
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 used in 2nd and 4th subframes */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64 Word16 * T0, /* o : integer part of pitch lag */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 Word16 * T0_frac, /* o : fractional part of pitch lag */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66 Word16 flag4 /* i : flag for encoding with 4 bits */
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67 );
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68
fb001496ca8c libtwamr: integrate dec_lag3.c
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 #endif