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send NACKs

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orignal 2014-11-29 16:21:19 -05:00
parent 3ff1158384
commit 95027930f2
1 changed files with 47 additions and 3 deletions
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50
Streaming.cpp
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@ -126,6 +126,13 @@ namespace stream
LogPrint ("Missing messages from ", m_LastReceivedSequenceNumber + 1, " to ", receivedSeqn - 1);
// save message and wait for missing message again
SavePacket (packet);
// send NACKs for missing messages ASAP
if (m_IsAckSendScheduled)
{
m_IsAckSendScheduled = false;
m_AckSendTimer.cancel ();
}
SendQuickAck ();
}
}
}
@ -320,6 +327,18 @@ namespace stream
void Stream::SendQuickAck ()
{
int32_t lastReceivedSeqn = m_LastReceivedSequenceNumber;
if (!m_SavedPackets.empty ())
{
int32_t seqn = (*m_SavedPackets.rbegin ())->GetSeqn ();
if (seqn > lastReceivedSeqn) lastReceivedSeqn = seqn;
}
if (lastReceivedSeqn < 0)
{
LogPrint (eLogError, "No packets have been received yet");
return;
}
Packet p;
uint8_t * packet = p.GetBuffer ();
size_t size = 0;
@ -329,10 +348,35 @@ namespace stream
size += 4; // receiveStreamID
*(uint32_t *)(packet + size) = 0; // this is plain Ack message
size += 4; // sequenceNum
*(uint32_t *)(packet + size) = htobe32 (m_LastReceivedSequenceNumber);
*(uint32_t *)(packet + size) = htobe32 (lastReceivedSeqn);
size += 4; // ack Through
packet[size] = 0;
size++; // NACK count
if (lastReceivedSeqn > m_LastReceivedSequenceNumber)
{
// fill NACKs
uint8_t * nacks = packet + size + 1;
uint8_t numNacks = 0;
auto nextSeqn = m_LastReceivedSequenceNumber + 1;
for (auto it: m_SavedPackets)
{
auto seqn = it->GetSeqn ();
for (uint32_t i = nextSeqn; i < seqn; i++)
{
*(uint32_t *)nacks = htobe32 (i);
nacks += 4;
numNacks++;
}
nextSeqn = seqn + 1;
}
packet[size] = numNacks;
size++; // NACK count
packet += numNacks*4; // NACKs
}
else
{
// No NACKs
packet[size] = 0;
size++; // NACK count
}
size++; // resend delay
*(uint16_t *)(packet + size) = 0; // nof flags set
size += 2; // flags