FreeCalypso > hg > gsm-codec-lib

annotate amrconv/bitmanip.c @ 282:9ee8ad3d4d30

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 05:44:47 +0000
parents b092a510141e
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
19
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
101
d86f866489e9 gsm-amr2efr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 19
diff changeset
2 * This module provides two utility functions that serve as building blocks
d86f866489e9 gsm-amr2efr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 19
diff changeset
3 * for frame bit reordering operations.
19
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
4 */
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
5
101
d86f866489e9 gsm-amr2efr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 19
diff changeset
6 #include <stdint.h>
19
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
7
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
8 msb_get_bit(buf, bn)
101
d86f866489e9 gsm-amr2efr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 19
diff changeset
9 uint8_t *buf;
19
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
10 {
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
11 int pos_byte = bn >> 3;
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
12 int pos_bit = 7 - (bn & 7);
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
13
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
14 return (buf[pos_byte] >> pos_bit) & 1;
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
15 }
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
16
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
17 msb_set_bit(buf, bn, bit)
101
d86f866489e9 gsm-amr2efr utility written
Mychaela Falconia <falcon@freecalypso.org>
parents: 19
diff changeset
18 uint8_t *buf;
19
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
19 {
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
20 int pos_byte = bn >> 3;
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
21 int pos_bit = 7 - (bn & 7);
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
22
107
41f1ae68d253 amr2efr & efr2amr cosmetic: cleaner approach to bit reshuffling
Mychaela Falconia <falcon@freecalypso.org>
parents: 101
diff changeset
23 if (bit)
41f1ae68d253 amr2efr & efr2amr cosmetic: cleaner approach to bit reshuffling
Mychaela Falconia <falcon@freecalypso.org>
parents: 101
diff changeset
24 buf[pos_byte] |= (1 << pos_bit);
41f1ae68d253 amr2efr & efr2amr cosmetic: cleaner approach to bit reshuffling
Mychaela Falconia <falcon@freecalypso.org>
parents: 101
diff changeset
25 else
41f1ae68d253 amr2efr & efr2amr cosmetic: cleaner approach to bit reshuffling
Mychaela Falconia <falcon@freecalypso.org>
parents: 101
diff changeset
26 buf[pos_byte] &= ~(1 << pos_bit);
19
7960744ba19c frtest: gsmfr-cvt-dlcap program based on fc-tch2fr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
27 }