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https://github.com/g4klx/MMDVMHost.git
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First go at VW mode IMBE FEC.
This commit is contained in:
Jonathan Naylor
parent
b560594cac
commit
38dc134982
168
AMBEFEC.cpp
168
AMBEFEC.cpp
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@ -17,6 +17,7 @@
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*/
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#include "Golay24128.h"
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#include "Hamming.h"
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#include "AMBEFEC.h"
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#include <cstdio>
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@ -453,6 +454,15 @@ const unsigned int DSTAR_B_TABLE[] = {2U, 8U, 14U, 20U, 26U, 32U, 38U, 44U, 50U
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const unsigned int DSTAR_C_TABLE[] = {4U, 10U, 16U, 22U, 28U, 34U, 40U, 46U, 52U, 58U, 64U, 70U,
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5U, 11U, 17U, 23U, 29U, 35U, 41U, 47U, 53U, 59U, 65U, 71U};
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const unsigned int IMBE_INTERLEAVE[] = {
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0, 7, 12, 19, 24, 31, 36, 43, 48, 55, 60, 67, 72, 79, 84, 91, 96, 103, 108, 115, 120, 127, 132, 139,
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1, 6, 13, 18, 25, 30, 37, 42, 49, 54, 61, 66, 73, 78, 85, 90, 97, 102, 109, 114, 121, 126, 133, 138,
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2, 9, 14, 21, 26, 33, 38, 45, 50, 57, 62, 69, 74, 81, 86, 93, 98, 105, 110, 117, 122, 129, 134, 141,
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3, 8, 15, 20, 27, 32, 39, 44, 51, 56, 63, 68, 75, 80, 87, 92, 99, 104, 111, 116, 123, 128, 135, 140,
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4, 11, 16, 23, 28, 35, 40, 47, 52, 59, 64, 71, 76, 83, 88, 95, 100, 107, 112, 119, 124, 131, 136, 143,
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5, 10, 17, 22, 29, 34, 41, 46, 53, 58, 65, 70, 77, 82, 89, 94, 101, 106, 113, 118, 125, 130, 137, 142
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};
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CAMBEFEC::CAMBEFEC()
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{
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}
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@ -583,50 +593,132 @@ unsigned int CAMBEFEC::regenerateDStar(unsigned char* bytes) const
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return errors;
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}
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unsigned int CAMBEFEC::regenerateYSF1(unsigned char* bytes) const
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unsigned int CAMBEFEC::regenerateYSF3(unsigned char* bytes) const
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{
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assert(bytes != NULL);
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unsigned int errors = 0U;
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unsigned int offset = 72U;
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for (unsigned int j = 0U; j < 5U; j++, offset += 144U) {
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unsigned int a = 0U;
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unsigned int b = 0U;
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unsigned int c = 0U;
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bool temp[144U];
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unsigned int MASK = 0x800000U;
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for (unsigned int i = 0U; i < 24U; i++) {
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unsigned int aPos = DMR_A_TABLE[i] + offset;
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unsigned int bPos = DMR_B_TABLE[i] + offset;
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unsigned int cPos = DMR_C_TABLE[i] + offset;
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if (READ_BIT(bytes, aPos))
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a |= MASK;
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if (READ_BIT(bytes, bPos))
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b |= MASK;
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if (READ_BIT(bytes, cPos))
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c |= MASK;
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MASK >>= 1;
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}
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errors += regenerate(a, b, c, true);
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MASK = 0x800000U;
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for (unsigned int i = 0U; i < 24U; i++) {
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unsigned int aPos = DMR_A_TABLE[i] + offset;
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unsigned int bPos = DMR_B_TABLE[i] + offset;
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unsigned int cPos = DMR_C_TABLE[i] + offset;
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WRITE_BIT(bytes, aPos, a & MASK);
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WRITE_BIT(bytes, bPos, b & MASK);
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WRITE_BIT(bytes, cPos, c & MASK);
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MASK >>= 1;
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}
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// De-interleave
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for (unsigned int i = 0U; i < 144U; i++) {
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unsigned int n = IMBE_INTERLEAVE[i];
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temp[i] = READ_BIT(bytes, n);
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}
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return errors;
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// now ..
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// 12 voice bits 0
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// 11 golay bits 12
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//
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// 12 voice bits 23
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// 11 golay bits 35
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//
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// 12 voice bits 46
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// 11 golay bits 58
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//
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// 12 voice bits 69
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// 11 golay bits 81
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//
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// 11 voice bits 92
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// 4 hamming bits 103
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//
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// 11 voice bits 107
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// 4 hamming bits 118
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//
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// 11 voice bits 122
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// 4 hamming bits 133
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//
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// 7 voice bits 137
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// De-Whiten some bits
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unsigned int prn = 0x00U;
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for (int i = 0U; i < 12U; i++)
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prn = (prn << 1) | (temp[i] & 1);
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prn <<= 4;
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for (unsigned int i = 23U; i < 137U; i++) {
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prn = (unsigned short)((173 * prn) + 13849);
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temp[i] ^= (prn >> 15) & 1;
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}
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// Check/Fix FEC
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bool* bit = temp;
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// c0
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unsigned int g1 = 0U;
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for (unsigned int i = 0U; i < 23U; i++)
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g1 = (g1 << 1) | (bit[i] & 1);
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unsigned int g3 = CGolay24128::decode23127(g1);
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unsigned int g2 = CGolay24128::encode23127(g3);
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for (int i = 23; i >= 0; i--) {
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bit[i] = g2 & 1;
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g2 >>= 1;
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}
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bit += 23U;
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// c1
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g1 = 0U;
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for (unsigned int i = 0U; i < 23U; i++)
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g1 = (g1 << 1) | (bit[i] & 1);
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g3 = CGolay24128::decode23127(g1);
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g2 = CGolay24128::encode23127(g3);
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for (int i = 23; i >= 0; i--) {
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bit[i] = g2 & 1;
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g2 >>= 1;
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}
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bit += 23U;
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// c2
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g1 = 0;
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for (int i = 0; i < 23; i++)
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g1 = (g1 << 1) | (bit[i] & 1);
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g3 = CGolay24128::decode23127(g1);
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g2 = CGolay24128::encode23127(g3);
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for (int i = 23; i >= 0; i--) {
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bit[i] = g2 & 1;
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g2 >>= 1;
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}
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bit += 23U;
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// c3
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g1 = 0U;
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for (int i = 0U; i < 23U; i++)
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g1 = (g1 << 1) | (bit[i] & 1);
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g3 = CGolay24128::decode23127(g1);
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g2 = CGolay24128::encode23127(g3);
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for (int i = 23; i >= 0; i--) {
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bit[i] = g2 & 1;
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g2 >>= 1;
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}
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bit += 23U;
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// c4
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CHamming::decode15113_1(bit);
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bit += 15U;
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// c5
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CHamming::decode15113_1(bit);
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bit += 15U;
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// c6
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CHamming::decode15113_1(bit);
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// Whiten some bits
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prn = 0x00U;
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for (unsigned int i = 0U; i < 12U; i++)
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prn = (prn << 1) | (temp[i] & 1);
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prn <<= 4;
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for (unsigned int i = 23U; i < 137U; i++) {
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prn = (unsigned short)((173 * prn) + 13849);
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temp[i] ^= (prn >> 15) & 1;
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}
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// Interleave
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for (unsigned int i = 0U; i < 144U; i++) {
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unsigned int n = IMBE_INTERLEAVE[i];
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WRITE_BIT(bytes, n, temp[i]);
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}
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return 0U;
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}
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unsigned int CAMBEFEC::regenerate(unsigned int& a, unsigned int& b, unsigned int& c, bool b23) const
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@ -28,7 +28,7 @@ public:
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unsigned int regenerateDStar(unsigned char* bytes) const;
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unsigned int regenerateYSF1(unsigned char* bytes) const;
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unsigned int regenerateYSF3(unsigned char* bytes) const;
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private:
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unsigned int regenerate(unsigned int& a, unsigned int& b, unsigned int& c, bool b23) const;
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@ -108,8 +108,7 @@ bool CYSFControl::writeModem(unsigned char *data)
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LogMessage("YSF, EOT, FI=%X FN=%u FT=%u DT=%X", fi, fn, ft, dt);
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m_payload.decode(data + 2U, fi, fn, ft, dt);
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// m_payload.encode(data + 2U); XXX
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m_payload.process(data + 2U, fi, fn, ft, dt);
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m_frames++;
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@ -150,14 +149,19 @@ bool CYSFControl::writeModem(unsigned char *data)
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LogMessage("YSF, Valid FICH, FI=%X FN=%u FT=%u DT=%X", fi, fn, ft, dt);
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m_payload.decode(data + 2U, fi, fn, ft, dt);
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// payload.encode(data + 2U); XXX
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m_payload.process(data + 2U, fi, fn, ft, dt);
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bool change = false;
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if (cm == 0x00U && m_dest == NULL) {
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m_dest = (unsigned char*)"CQCQCQ ";
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change = true;
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if (m_dest == NULL) {
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if (cm == YSF_CM_GROUP) {
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m_dest = (unsigned char*)"CQCQCQ ";
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change = true;
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} else {
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m_dest = m_payload.getDest();
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if (m_dest != NULL)
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change = true;
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}
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}
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if (m_source == NULL) {
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@ -166,12 +170,6 @@ bool CYSFControl::writeModem(unsigned char *data)
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change = true;
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}
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if (m_dest == NULL) {
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m_dest = m_payload.getDest();
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if (m_dest != NULL)
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change = true;
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}
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if (change) {
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if (m_source != NULL && m_dest != NULL) {
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m_display->writeFusion((char*)m_source, (char*)m_dest);
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@ -188,7 +186,7 @@ bool CYSFControl::writeModem(unsigned char *data)
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}
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} else {
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// Reconstruct FICH based on the last valid frame
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m_fich.setFI(0x01U); // Communication channel
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m_fich.setFI(YSF_FI_COMMUNICATIONS); // Communication channel
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}
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m_frames++;
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@ -75,70 +75,56 @@ const unsigned char BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U
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#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
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CYSFPayload::CYSFPayload() :
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m_data(NULL),
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m_uplink(NULL),
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m_downlink(NULL),
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m_source(NULL),
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m_dest(NULL),
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m_fec()
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{
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m_data = new unsigned char[90U];
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}
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CYSFPayload::~CYSFPayload()
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{
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delete[] m_data;
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delete[] m_uplink;
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delete[] m_downlink;
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delete[] m_source;
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delete[] m_dest;
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}
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void CYSFPayload::decode(const unsigned char* bytes, unsigned char fi, unsigned char fn, unsigned char ft, unsigned char dt)
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void CYSFPayload::process(unsigned char* bytes, unsigned char fi, unsigned char fn, unsigned char ft, unsigned char dt)
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{
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assert(bytes != NULL);
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::memcpy(m_data, bytes + YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES, 90U);
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// Header and trailer
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if (fi == 0U || fi == 2U) {
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decodeHeader();
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processHeader(bytes + YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES);
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return;
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}
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// V/D Mode 1
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if (dt == 0U) {
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decodeVDMode1(fn);
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return;
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}
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switch (dt) {
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case YSF_DT_VD_MODE1:
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processVDMode1(bytes + YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES, fn);
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break;
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// V/D Mode 2
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if (dt == 2U) {
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decodeVDMode2(fn);
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return;
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}
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case YSF_DT_VD_MODE2:
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processVDMode2(bytes + YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES, fn);
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break;
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// Data FR Mode
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if (dt == 1U) {
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decodeDataFRMode(fn);
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return;
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}
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case YSF_DT_DATA_FR_MODE:
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processDataFRMode(bytes + YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES, fn);
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break;
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// Voice FR Mode
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default: // YSF_DT_VOICE_FR_MODE
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processVoiceFRMode(bytes + YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES);
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break;
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}
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}
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void CYSFPayload::encode(unsigned char* bytes)
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{
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assert(bytes != NULL);
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::memcpy(bytes + YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES, m_data, 90U);
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}
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void CYSFPayload::decodeHeader()
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void CYSFPayload::processHeader(unsigned char* data)
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{
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unsigned char dch[45U];
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unsigned char* p1 = m_data;
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unsigned char* p1 = data;
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unsigned char* p2 = dch;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p2, p1, 9U);
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@ -205,7 +191,7 @@ void CYSFPayload::decodeHeader()
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WRITE_BIT1(bytes, n, s1);
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}
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p1 = m_data;
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p1 = data;
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p2 = bytes;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p1, p2, 9U);
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@ -244,7 +230,7 @@ void CYSFPayload::decodeHeader()
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WRITE_BIT1(bytes, n, s1);
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}
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p1 = m_data + 9U;
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p1 = data + 9U;
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p2 = bytes;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p1, p2, 9U);
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@ -252,16 +238,21 @@ void CYSFPayload::decodeHeader()
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}
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}
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void CYSFPayload::decodeVDMode1(unsigned char fn)
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void CYSFPayload::processVDMode1(unsigned char* data, unsigned char fn)
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{
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// Regenerate the AMBE FEC
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unsigned int errors = m_fec.regenerateYSF1(m_data);
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unsigned int errors = 0U;
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errors += m_fec.regenerateDMR(data + 9U);
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errors += m_fec.regenerateDMR(data + 27U);
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errors += m_fec.regenerateDMR(data + 45U);
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errors += m_fec.regenerateDMR(data + 63U);
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errors += m_fec.regenerateDMR(data + 81U);
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LogMessage("YSF, V/D Mode 1, AMBE FEC %u/235 (%.1f%%)", errors, float(errors) / 235.0F);
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unsigned char dch[45U];
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unsigned char* p1 = m_data;
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unsigned char* p1 = data;
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unsigned char* p2 = dch;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p2, p1, 9U);
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@ -356,7 +347,7 @@ void CYSFPayload::decodeVDMode1(unsigned char fn)
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WRITE_BIT1(bytes, n, s1);
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}
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p1 = m_data;
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p1 = data;
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p2 = bytes;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p1, p2, 9U);
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@ -365,11 +356,11 @@ void CYSFPayload::decodeVDMode1(unsigned char fn)
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}
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}
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void CYSFPayload::decodeVDMode2(unsigned char fn)
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void CYSFPayload::processVDMode2(unsigned char* data, unsigned char fn)
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{
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unsigned char dch[25U];
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unsigned char* p1 = m_data;
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unsigned char* p1 = data;
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unsigned char* p2 = dch;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p2, p1, 5U);
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@ -467,7 +458,7 @@ void CYSFPayload::decodeVDMode2(unsigned char fn)
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WRITE_BIT1(bytes, n, s1);
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}
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p1 = m_data;
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p1 = data;
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p2 = bytes;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p1, p2, 5U);
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@ -476,11 +467,11 @@ void CYSFPayload::decodeVDMode2(unsigned char fn)
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}
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}
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void CYSFPayload::decodeDataFRMode(unsigned char fn)
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void CYSFPayload::processDataFRMode(unsigned char* data, unsigned char fn)
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{
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unsigned char dch[45U];
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unsigned char* p1 = m_data;
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unsigned char* p1 = data;
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unsigned char* p2 = dch;
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for (unsigned int i = 0U; i < 5U; i++) {
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::memcpy(p2, p1, 9U);
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@ -559,7 +550,7 @@ void CYSFPayload::decodeDataFRMode(unsigned char fn)
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WRITE_BIT1(bytes, n, s1);
|
||||
}
|
||||
|
||||
p1 = m_data;
|
||||
p1 = data;
|
||||
p2 = bytes;
|
||||
for (unsigned int i = 0U; i < 5U; i++) {
|
||||
::memcpy(p1, p2, 9U);
|
||||
|
|
@ -567,7 +558,7 @@ void CYSFPayload::decodeDataFRMode(unsigned char fn)
|
|||
}
|
||||
}
|
||||
|
||||
p1 = m_data + 9U;
|
||||
p1 = data + 9U;
|
||||
p2 = dch;
|
||||
for (unsigned int i = 0U; i < 5U; i++) {
|
||||
::memcpy(p2, p1, 9U);
|
||||
|
|
@ -630,7 +621,7 @@ void CYSFPayload::decodeDataFRMode(unsigned char fn)
|
|||
WRITE_BIT1(bytes, n, s1);
|
||||
}
|
||||
|
||||
p1 = m_data + 9U;
|
||||
p1 = data + 9U;
|
||||
p2 = bytes;
|
||||
for (unsigned int i = 0U; i < 5U; i++) {
|
||||
::memcpy(p1, p2, 9U);
|
||||
|
|
@ -639,6 +630,19 @@ void CYSFPayload::decodeDataFRMode(unsigned char fn)
|
|||
}
|
||||
}
|
||||
|
||||
void CYSFPayload::processVoiceFRMode(unsigned char* data)
|
||||
{
|
||||
// Regenerate the AMBE FEC
|
||||
unsigned int errors = 0U;
|
||||
errors += m_fec.regenerateYSF3(data + 0U);
|
||||
errors += m_fec.regenerateYSF3(data + 18U);
|
||||
errors += m_fec.regenerateYSF3(data + 36U);
|
||||
errors += m_fec.regenerateYSF3(data + 54U);
|
||||
errors += m_fec.regenerateYSF3(data + 72U);
|
||||
|
||||
LogMessage("YSF, V Mode 3, AMBE FEC %u/720 (%.1f%%)", errors, float(errors) / 720.0F);
|
||||
}
|
||||
|
||||
void CYSFPayload::setUplink(const std::string& callsign)
|
||||
{
|
||||
m_uplink = new unsigned char[10U];
|
||||
|
|
|
|||
14
YSFPayload.h
14
YSFPayload.h
|
|
@ -28,9 +28,7 @@ public:
|
|||
CYSFPayload();
|
||||
~CYSFPayload();
|
||||
|
||||
void decode(const unsigned char* bytes, unsigned char fi, unsigned char fn, unsigned char ft, unsigned char dt);
|
||||
|
||||
void encode(unsigned char* bytes);
|
||||
void process(unsigned char* bytes, unsigned char fi, unsigned char fn, unsigned char ft, unsigned char dt);
|
||||
|
||||
unsigned char* getSource();
|
||||
unsigned char* getDest();
|
||||
|
|
@ -41,17 +39,17 @@ public:
|
|||
void reset();
|
||||
|
||||
private:
|
||||
unsigned char* m_data;
|
||||
unsigned char* m_uplink;
|
||||
unsigned char* m_downlink;
|
||||
unsigned char* m_source;
|
||||
unsigned char* m_dest;
|
||||
CAMBEFEC m_fec;
|
||||
|
||||
void decodeHeader();
|
||||
void decodeVDMode1(unsigned char fn);
|
||||
void decodeVDMode2(unsigned char fn);
|
||||
void decodeDataFRMode(unsigned char fn);
|
||||
void processHeader(unsigned char* bytes);
|
||||
void processVDMode1(unsigned char* bytes, unsigned char fn);
|
||||
void processVDMode2(unsigned char* bytes, unsigned char fn);
|
||||
void processDataFRMode(unsigned char* bytes, unsigned char fn);
|
||||
void processVoiceFRMode(unsigned char* bytes);
|
||||
};
|
||||
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in a new issue