diff options
Diffstat (limited to 'gsm-receiver/src/lib/decoder/interleave.c')
| -rw-r--r-- | gsm-receiver/src/lib/decoder/interleave.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/gsm-receiver/src/lib/decoder/interleave.c b/gsm-receiver/src/lib/decoder/interleave.c index 7b45927..8d11286 100644 --- a/gsm-receiver/src/lib/decoder/interleave.c +++ b/gsm-receiver/src/lib/decoder/interleave.c @@ -25,6 +25,27 @@ interleave_init(INTERLEAVE_CTX *ictx, int size, int block_size) } int +interleave_init_facch_f(INTERLEAVE_CTX *ictx, int size, int block_size, int block_offset) +{ + ictx->trans_size = size; + ictx->trans = (unsigned short *)malloc(size * sizeof *ictx->trans); + +// DEBUGF("size: %d\n", size); +// DEBUGF("Block size: %d\n", block_size); + int j, k, B; + for (k = 0; k < size; k++) + { + B = (k + block_offset) % 8; + j = 2 * ((49 * k) % 57) + ((k % 8) / 4); + ictx->trans[k] = B * block_size + j; + /* Mapping: pos1 goes to pos2: pos1 -> pos2 */ +// DEBUGF("%d -> %d\n", ictx->trans[k], k); + } +// exit(0); + return 0; +} + +int interleave_deinit(INTERLEAVE_CTX *ictx) { if (ictx->trans != NULL) |