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handle erasures produced by LDPC decoding

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This commit is contained in:
Ahmet Inan 2021-06-12 13:27:08 +02:00
commit 4683e531fe
1 changed files with 15 additions and 1 deletions
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16
decode.cc
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@ -192,6 +192,7 @@ struct Decoder
CODE::LDPCDecoder<DVB_T2_TABLE_A3, 1> ldpcdec;
int8_t genmat[255*71];
int8_t code[code_bits], bint[code_bits];
uint16_t erasures[24];
cmplx head[symbol_len], tail[symbol_len];
cmplx fdom[symbol_len], tdom[buffer_len], resam[buffer_len];
value phase[symbol_len/2];
@ -429,7 +430,20 @@ struct Decoder
}
for (int i = 0; i < data_bits+32+12*16; ++i)
CODE::set_le_bit(out, i, code[i] < 0);
int ret = bchdec1(out, out+(data_bits+32)/8, 0, 0, data_bits+32);
int ecnt = 0;
for (int i = 0; i < data_bits+32+12*16; ++i) {
if (!code[i]) {
if (ecnt < 24) {
erasures[ecnt++] = i;
} else {
std::cerr << "payload LDPC produced more than 24 erasures." << std::endl;
return;
}
}
}
if (ecnt)
std::cerr << "payload LDPC produced " << ecnt << " erasures." << std::endl;
int ret = bchdec1(out, out+(data_bits+32)/8, erasures, ecnt, data_bits+32);
if (ret < 0) {
std::cerr << "payload BCH error." << std::endl;
return;