FreeCalypso > hg > gsm-codec-lib
view amrconv/bitmanip.c @ 216:9d59df9b0e4e
amrconv: new program amr-ietf2cod
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Fri, 21 Apr 2023 21:28:02 +0000 |
parents | b092a510141e |
children |
line wrap: on
line source
/* * This module provides two utility functions that serve as building blocks * for frame bit reordering operations. */ #include <stdint.h> msb_get_bit(buf, bn) uint8_t *buf; { int pos_byte = bn >> 3; int pos_bit = 7 - (bn & 7); return (buf[pos_byte] >> pos_bit) & 1; } msb_set_bit(buf, bn, bit) uint8_t *buf; { int pos_byte = bn >> 3; int pos_bit = 7 - (bn & 7); if (bit) buf[pos_byte] |= (1 << pos_bit); else buf[pos_byte] &= ~(1 << pos_bit); }