FreeCalypso > hg > gsm-codec-lib

annotate libgsmefr/dec_main.c @ 153:14b627682458

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
gsmfr-decode-r utility put together
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 14 Dec 2022 23:11:20 +0000
parents 18866c0354ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
94
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * This module contains our GSM EFR decoder main function, EFR_decode_params(),
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 * that stands at the boundary between our public interface and the guts of
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 * ETSI-based codec.
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7 #include "gsm_efr.h"
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 #include "typedef.h"
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
9 #include "namespace.h"
98
18866c0354ef libgsmefr/dec_main.c: need to use official shl() function
Mychaela Falconia <falcon@freecalypso.org>
parents: 94
diff changeset
10 #include "basic_op.h"
94
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 #include "cnst.h"
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 #include "codec.h"
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 #include "sig_proc.h"
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 #include "memops.h"
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 #include "dec_state.h"
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 #include "d_homing.h"
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 /* These constants define the number of consecutive parameters
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 that function decoder_homing_frame_test() checks */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 #define WHOLE_FRAME 57
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22 #define TO_FIRST_SUBFRAME 18
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
23
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 void EFR_decode_params(struct EFR_decoder_state *st, const int16_t *params,
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 int bfi, int SID_flag, int TAF, int16_t *pcm_out)
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
26 {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 Word16 *synth = st->synth_buf + M;
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 Word16 Az_dec[AZ_SIZE];
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 Word16 i, temp;
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 Word16 reset_flag;
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
31
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
32 if (!bfi) /* BFI == 0, perform DHF check */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 if (st->reset_flag_old) /* Check for second and further
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 successive DHF (to first subfr.) */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
36 {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
37 reset_flag = decoder_homing_frame_test (params,
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
38 TO_FIRST_SUBFRAME);
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
39 }
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
40 else
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
41 {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
42 reset_flag = 0;
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
43 }
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
44 }
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
45 else /* BFI==1, bypass DHF check (frame
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
46 is taken as not being a DHF) */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
47 {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
48 reset_flag = 0;
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
49 }
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
50
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
51 if (reset_flag && st->reset_flag_old)
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
52 {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
53 /* Force the output to be the encoder homing frame pattern */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
54
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
55 for (i = 0; i < L_FRAME; i++)
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
56 {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
57 synth[i] = EHF_MASK;
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
58 }
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
59 }
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
60 else
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
61 {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
62 /* Synthesis */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
63 Decoder_12k2 (st, bfi, params, synth, Az_dec, TAF, SID_flag);
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
64
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
65 Post_Filter (st, synth, Az_dec); /* Post-filter */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
66
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
67 for (i = 0; i < L_FRAME; i++)
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
68 /* Upscale the 15 bit linear PCM to 16 bits,
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
69 then truncate to 13 bits */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
70 {
98
18866c0354ef libgsmefr/dec_main.c: need to use official shl() function
Mychaela Falconia <falcon@freecalypso.org>
parents: 94
diff changeset
71 temp = shl (synth[i], 1);
94
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
72 synth[i] = temp & 0xfff8;
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
73 }
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
74 } /* else */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
75
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
76 Copy (synth, pcm_out, L_FRAME);
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
77
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
78 /* BFI == 0, perform check for first DHF (whole frame) */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
79 if (!bfi && !st->reset_flag_old)
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
80 {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
81 reset_flag = decoder_homing_frame_test (params, WHOLE_FRAME);
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
82 }
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
83
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
84 if (reset_flag)
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
85 {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
86 /* Bring the decoder and receive DTX to the home state */
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
87 EFR_decoder_reset(st);
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
88 } else {
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
89 st->reset_flag_old = 0;
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
90 }
d80e9f12a1d1 libgsmefr: decoder main function put together
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
91 }