FreeCalypso > hg > gsm-codec-lib

annotate libgsmfr2/pp_good.c @ 539:0daaae66b3f6

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
libtest: add TW-TS-005 write helper function
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 22 Sep 2024 00:21:16 +0000
parents 96c4ed5529bf
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
5
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * In this module we implement preprocessing of received good frames.
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
3 */
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5 #include <stdint.h>
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
6 #include <string.h>
256
a33edf624061 libgsmfr2: start with API definition and port of libgsmfrp code
Mychaela Falconia <falcon@freecalypso.org>
parents: 242
diff changeset
7 #include "tw_gsmfr.h"
262
573afa985df6 libgsmfr2: split pp_state.h from pp_internal.h
Mychaela Falconia <falcon@freecalypso.org>
parents: 256
diff changeset
8 #include "pp_state.h"
256
a33edf624061 libgsmfr2: start with API definition and port of libgsmfrp code
Mychaela Falconia <falcon@freecalypso.org>
parents: 242
diff changeset
9 #include "pp_internal.h"
5
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10
256
a33edf624061 libgsmfr2: start with API definition and port of libgsmfrp code
Mychaela Falconia <falcon@freecalypso.org>
parents: 242
diff changeset
11 void gsmfr_preproc_good_frame(struct gsmfr_preproc_state *st, uint8_t *frame)
5
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 {
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13 int sid;
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 /* always set correct magic */
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16 frame[0] = 0xD0 | frame[0] & 0x0F;
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 /* now classify by SID */
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
18 sid = gsmfr_preproc_sid_classify(frame);
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 switch (sid) {
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 case 0: /* good speech frame */
242
f081a6850fb5 libgsmfrp: new refined implementation
Mychaela Falconia <falcon@freecalypso.org>
parents: 5
diff changeset
21 st->rx_state = SPEECH;
530
96c4ed5529bf libgsmfr2 preproc: implement support for DTXd
Mychaela Falconia <falcon@freecalypso.org>
parents: 262
diff changeset
22 st->dtxd_sid_flag = 0;
256
a33edf624061 libgsmfr2: start with API definition and port of libgsmfrp code
Mychaela Falconia <falcon@freecalypso.org>
parents: 242
diff changeset
23 memcpy(&st->speech_frame, frame, GSMFR_RTP_FRAME_LEN);
5
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
24 return;
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
25 case 1: /* invalid SID frame */
242
f081a6850fb5 libgsmfrp: new refined implementation
Mychaela Falconia <falcon@freecalypso.org>
parents: 5
diff changeset
26 /* state-dependent handling, similar to BFI */
f081a6850fb5 libgsmfrp: new refined implementation
Mychaela Falconia <falcon@freecalypso.org>
parents: 5
diff changeset
27 gsmfr_preproc_invalid_sid(st, frame);
5
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
28 return;
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
29 case 2: /* valid SID frame */
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
30 st->rx_state = COMFORT_NOISE;
530
96c4ed5529bf libgsmfr2 preproc: implement support for DTXd
Mychaela Falconia <falcon@freecalypso.org>
parents: 262
diff changeset
31 st->dtxd_sid_flag = 1;
242
f081a6850fb5 libgsmfrp: new refined implementation
Mychaela Falconia <falcon@freecalypso.org>
parents: 5
diff changeset
32 gsmfr_preproc_sid2cn(st, frame);
5
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
33 return;
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
34 }
4812e00bc100 libgsmfrp: implement handling of good frames
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
35 }