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Add a dummy header when DN mode late entry occurs.

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This commit is contained in:
Jonathan Naylor
2017-08-14 16:13:56 +01:00
parent 6d9bca0016
commit f4beafc593
5 changed files with 158 additions and 3 deletions
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99
YSFPayload.cpp
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@@ -816,6 +816,105 @@ unsigned int CYSFPayload::processVoiceFRModeAudio(unsigned char* data)
return errors;
}
void CYSFPayload::writeHeader(unsigned char* data, const unsigned char* csd1, const unsigned char* csd2)
{
assert(data != NULL);
assert(csd1 != NULL);
assert(csd2 != NULL);
writeDataFRModeData1(csd1, data);
writeDataFRModeData2(csd2, data);
}
void CYSFPayload::writeDataFRModeData1(const unsigned char* dt, unsigned char* data)
{
assert(dt != NULL);
assert(data != NULL);
data += YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES;
unsigned char output[25U];
for (unsigned int i = 0U; i < 20U; i++)
output[i] = dt[i] ^ WHITENING_DATA[i];
CCRC::addCCITT162(output, 22U);
output[22U] = 0x00U;
unsigned char convolved[45U];
CYSFConvolution conv;
conv.encode(output, convolved, 180U);
unsigned char bytes[45U];
unsigned int j = 0U;
for (unsigned int i = 0U; i < 180U; i++) {
unsigned int n = INTERLEAVE_TABLE_9_20[i];
bool s0 = READ_BIT1(convolved, j) != 0U;
j++;
bool s1 = READ_BIT1(convolved, j) != 0U;
j++;
WRITE_BIT1(bytes, n, s0);
n++;
WRITE_BIT1(bytes, n, s1);
}
unsigned char* p1 = data;
unsigned char* p2 = bytes;
for (unsigned int i = 0U; i < 5U; i++) {
::memcpy(p1, p2, 9U);
p1 += 18U; p2 += 9U;
}
}
void CYSFPayload::writeDataFRModeData2(const unsigned char* dt, unsigned char* data)
{
assert(dt != NULL);
assert(data != NULL);
data += YSF_SYNC_LENGTH_BYTES + YSF_FICH_LENGTH_BYTES;
unsigned char output[25U];
for (unsigned int i = 0U; i < 20U; i++)
output[i] = dt[i] ^ WHITENING_DATA[i];
CCRC::addCCITT162(output, 22U);
output[22U] = 0x00U;
unsigned char convolved[45U];
CYSFConvolution conv;
conv.encode(output, convolved, 180U);
unsigned char bytes[45U];
unsigned int j = 0U;
for (unsigned int i = 0U; i < 180U; i++) {
unsigned int n = INTERLEAVE_TABLE_9_20[i];
bool s0 = READ_BIT1(convolved, j) != 0U;
j++;
bool s1 = READ_BIT1(convolved, j) != 0U;
j++;
WRITE_BIT1(bytes, n, s0);
n++;
WRITE_BIT1(bytes, n, s1);
}
unsigned char* p1 = data + 9U;
unsigned char* p2 = bytes;
for (unsigned int i = 0U; i < 5U; i++) {
::memcpy(p1, p2, 9U);
p1 += 18U; p2 += 9U;
}
}
void CYSFPayload::setUplink(const std::string& callsign)
{
m_uplink = new unsigned char[YSF_CALLSIGN_LENGTH];