FreeCalypso > hg > gsm-codec-lib
comparison miscutil/bitmanip.c @ 101:d86f866489e9
gsm-amr2efr utility written
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sun, 27 Nov 2022 05:15:39 +0000 |
parents | frtest/tidsp.c@7960744ba19c |
children | 41f1ae68d253 |
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100:d5bab777865a | 101:d86f866489e9 |
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1 /* | |
2 * This module provides two utility functions that serve as building blocks | |
3 * for frame bit reordering operations. | |
4 */ | |
5 | |
6 #include <stdint.h> | |
7 | |
8 msb_get_bit(buf, bn) | |
9 uint8_t *buf; | |
10 { | |
11 int pos_byte = bn >> 3; | |
12 int pos_bit = 7 - (bn & 7); | |
13 | |
14 return (buf[pos_byte] >> pos_bit) & 1; | |
15 } | |
16 | |
17 msb_set_bit(buf, bn, bit) | |
18 uint8_t *buf; | |
19 { | |
20 int pos_byte = bn >> 3; | |
21 int pos_bit = 7 - (bn & 7); | |
22 | |
23 buf[pos_byte] |= (bit << pos_bit); | |
24 } |