FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/sig_proc.h @ 183:452c1d5a6268

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents 988fd7ff514f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
39
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*--------------------------------------------------------------*
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * Function prototypes for general SIGnal PROCessing functions. *
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 *--------------------------------------------------------------*/
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 /* Mathematic functions */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 Word32 Inv_sqrt ( /* (o) : output value (range: 0<=val<1) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 Word32 L_x /* (i) : input value (range: 0<=val<=7fffffff) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 void Log2 (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 Word32 L_x, /* (i) : input value */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 Word16 *exponent, /* (o) : Integer part of Log2. (range: 0<=val<=30) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 Word16 *fraction /* (o) : Fractional part of Log2. (range: 0<=val<1)*/
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 Word32 Pow2 ( /* (o) : result (range: 0<=val<=0x7fffffff) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 Word16 exponent, /* (i) : Integer part. (range: 0<=val<=30) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 Word16 fraction /* (i) : Fractional part. (range: 0.0<=val<1.0) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 /* General signal processing */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21
52
988fd7ff514f libgsmefr: add state pointers to ETSI function prototypes
Mychaela Falconia <falcon@freecalypso.org>
parents: 39
diff changeset
22 void Init_Pre_Process (struct EFR_encoder_state *st);
39
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23 void Pre_Process (
52
988fd7ff514f libgsmefr: add state pointers to ETSI function prototypes
Mychaela Falconia <falcon@freecalypso.org>
parents: 39
diff changeset
24 struct EFR_encoder_state *st,
39
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 Word16 signal[], /* Input/output signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 Word16 lg /* Lenght of signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 Word16 Autocorr (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 Word16 x[], /* (i) : Input signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31 Word16 m, /* (i) : LPC order */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 Word16 r_h[], /* (o) : Autocorrelations (msb) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 Word16 r_l[], /* (o) : Autocorrelations (lsb) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 const Word16 wind[]/* (i) : window for LPC analysis. */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 void Lag_window (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 Word16 m, /* (i) : LPC order */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 Word16 r_h[], /* (i/o) : Autocorrelations (msb) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 Word16 r_l[] /* (i/o) : Autocorrelations (lsb) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 void Levinson (
52
988fd7ff514f libgsmefr: add state pointers to ETSI function prototypes
Mychaela Falconia <falcon@freecalypso.org>
parents: 39
diff changeset
42 struct EFR_encoder_state *st,
39
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 Word16 Rh[], /* (i) : Rh[m+1] Vector of autocorrelations (msb) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 Word16 Rl[], /* (i) : Rl[m+1] Vector of autocorrelations (lsb) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 Word16 A[], /* (o) : A[m] LPC coefficients (m = 10) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 Word16 rc[] /* (o) : rc[4] First 4 reflection coefficients */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 void Az_lsp (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 Word16 a[], /* (i) : predictor coefficients */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50 Word16 lsp[], /* (o) : line spectral pairs */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 Word16 old_lsp[] /* (i) : old lsp[] (in case not found 10 roots) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 void Lsp_Az (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54 Word16 lsp[], /* (i) : line spectral frequencies */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 Word16 a[] /* (o) : predictor coefficients (order = 10) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 void Lsf_lsp (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 Word16 lsf[], /* (i) : lsf[m] normalized (range: 0.0<=val<=0.5) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 Word16 lsp[], /* (o) : lsp[m] (range: -1<=val<1) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 Word16 m /* (i) : LPC order */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 void Lsp_lsf (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 Word16 lsp[], /* (i) : lsp[m] (range: -1<=val<1) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64 Word16 lsf[], /* (o) : lsf[m] normalized (range: 0.0<=val<=0.5) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 Word16 m /* (i) : LPC order */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67 void Reorder_lsf (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68 Word16 *lsf, /* (i/o) : vector of LSFs (range: 0<=val<=0.5) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 Word16 min_dist, /* (i) : minimum required distance */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 Word16 n /* (i) : LPC order */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
71 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
72 void Weight_Fac (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
73 Word16 gamma, /* (i) : Spectral expansion. */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
74 Word16 fac[] /* (i/o) : Computed factors. */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
76 void Weight_Ai (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
77 Word16 a[], /* (i) : a[m+1] LPC coefficients (m=10) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
78 const Word16 fac[],/* (i) : Spectral expansion factors. */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
79 Word16 a_exp[] /* (o) : Spectral expanded LPC coefficients */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
80 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
81 void Residu (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
82 Word16 a[], /* (i) : prediction coefficients */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
83 Word16 x[], /* (i) : speech signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
84 Word16 y[], /* (o) : residual signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
85 Word16 lg /* (i) : size of filtering */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
86 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
87 void Syn_filt (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
88 Word16 a[], /* (i) : a[m+1] prediction coefficients (m=10) */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
89 Word16 x[], /* (i) : input signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
90 Word16 y[], /* (o) : output signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
91 Word16 lg, /* (i) : size of filtering */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
92 Word16 mem[], /* (i/o): memory associated with this filtering. */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
93 Word16 update /* (i) : 0=no update, 1=update of memory. */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
94 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
95 void Convolve (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
96 Word16 x[], /* (i) : input vector */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
97 Word16 h[], /* (i) : impulse response */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
98 Word16 y[], /* (o) : output vector */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
99 Word16 L /* (i) : vector size */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
100 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
101 void agc (
52
988fd7ff514f libgsmefr: add state pointers to ETSI function prototypes
Mychaela Falconia <falcon@freecalypso.org>
parents: 39
diff changeset
102 struct EFR_decoder_state *st,
39
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
103 Word16 *sig_in, /* (i) : postfilter input signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
104 Word16 *sig_out, /* (i/o): postfilter output signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
105 Word16 agc_fac, /* (i) : AGC factor */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
106 Word16 l_trm /* (i) : subframe size */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
107 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
108 void agc2 (
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
109 Word16 *sig_in, /* (i) : postfilter input signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
110 Word16 *sig_out, /* (i/o): postfilter output signal */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
111 Word16 l_trm /* (i) : subframe size */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
112 );
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 void preemphasis (
52
988fd7ff514f libgsmefr: add state pointers to ETSI function prototypes
Mychaela Falconia <falcon@freecalypso.org>
parents: 39
diff changeset
114 struct EFR_decoder_state *st,
39
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
115 Word16 *signal, /* (i/o): input signal overwritten by the output */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
116 Word16 g, /* (i) : preemphasis coefficient */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
117 Word16 L /* (i) : size of filtering */
36e1363ad885 libgsmefr: initial import of ETSI header files
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
118 );