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add file op25_p25_frame.h 

git-svn-id: http://op25.osmocom.org/svn/trunk@185 65a5c917-d112-43f1-993d-58c26a4786be
This commit is contained in:
max 2009-11-27 20:27:23 +00:00
parent 0c54173963
commit f3e5845667
1 changed files with 38 additions and 0 deletions
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38
decoder/src/lib/op25_p25_frame.h Normal file
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#ifndef INCLUDED_OP25_P25_FRAME_H
#define INCLUDED_OP25_P25_FRAME_H 1
static const size_t P25_VOICE_FRAME_SIZE = 1728;
static const size_t P25_HEADER_SYMBOLS = 24 + 32 + 1;
static const size_t P25_HEADER_BITS = P25_HEADER_SYMBOLS * 2;
static const uint64_t P25_FRAME_SYNC_MAGIC = 0x5575F5FF77FFLL;
static const uint64_t P25_FRAME_SYNC_REV_P = 0x5575F5FF77FFLL ^ 0xAAAAAAAAAAAALL;
static const uint64_t P25_FRAME_SYNC_MASK = 0xFFFFFFFFFFFFLL;
/* Given a 64-bit frame header word and a frame body which is to be initialized
* 1. Place flags at beginning of frame body
* 2. Store 64-bit frame header word
* 3. FIXME Place first status symbol
*/
static inline void
p25_setup_frame_header(bit_vector& frame_body, uint64_t hw) {
uint64_t acc = P25_FRAME_SYNC_MAGIC;
for (int i=47; i>=0; i--) {
frame_body[ i ] = acc & 1;
acc >>= 1;
}
acc = hw;
for (int i=113; i>=72; i--) {
frame_body[ i ] = acc & 1;
acc >>= 1;
}
// FIXME: insert proper status dibit bits at 70, 71
frame_body[70] = 1;
frame_body[71] = 0;
for (int i=69; i>=48; i--) {
frame_body[ i ] = acc & 1;
acc >>= 1;
}
}
#endif /* INCLUDED_OP25_P25_FRAME_H */