void BitVector::encode(const ViterbiTCH_AFS12_2& coder, BitVector& target) const
| 41 | |
| 42 | //void BitVector::encode(const ViterbiTCH_AFS12_2& coder, BitVector& target) const |
| 43 | void ViterbiTCH_AFS12_2::encode(const BitVector& in, BitVector& target) const |
| 44 | { |
| 45 | assert(in.size() == 250); |
| 46 | assert(target.size() == 508); |
| 47 | const char *u = in.begin(); |
| 48 | char *C = target.begin(); |
| 49 | const unsigned H = 4; |
| 50 | BitVector r(254+H); |
| 51 | for (int k = -H; k <= -1; k++) r[k+H] = 0; |
| 52 | for (unsigned k = 0; k <= 249; k++) { |
| 53 | r[k+H] = u[k] ^ r[k-3+H] ^ r[k-4+H]; |
| 54 | C[2*k] = u[k]; |
| 55 | C[2*k+1] = r[k+H] ^ r[k-1+H] ^ r[k-3+H] ^ r[k-4+H]; |
| 56 | } |
| 57 | // termination |
| 58 | for (unsigned k = 250; k <= 253; k++) { |
| 59 | r[k+H] = 0; |
| 60 | C[2*k] = r[k-3+H] ^ r[k-4+H]; |
| 61 | C[2*k+1] = r[k+H] ^ r[k-1+H] ^ r[k-3+H] ^ r[k-4+H]; |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | |
| 66 |