VBAN incoming packet process example: (general algorithm base)
Code: Select all
PROCESS_UDP_PACKET(void * packet, long packetsize, SOCKADDR_IN from);
{
LPT_VBAN_HEADER lpHeader = (LPT_VBAN_HEADER)packet;
//Detect a VBAN packet in a single 32 bit instruction
if (lpHeader->vban == 'NABV')
{
//check the IP-From and Stream Name (different stream can come in)
fOk=CheckIfWeProcessThisStream(lpHeader, from);
if (fOk)
{
//get datasize (ater header) and protocol/codec index
Datasize = packetsize - sizeof(T_VBAN_HEADER);
protocol = lpHeader->format_SR & VBAN_PROTOCOL_MASK;
codec = lpHeader->format_bit & VBAN_CODEC_MASK;
//protocol selector
if (protocol == VBAN_PROTOCOL_AUDIO)
{
//codec selector
switch (codec)
{
case VBAN_CODEC_PCM:
//get audio stream information
SR =VBAN_SRList[lpHeader->format_SR & VBAN_SR_MASK];
nbChannel =((long)lpHeader->format_nbc)+1;
fReserved =lpHeader->format_bit & 0x08;
BitResolution = lpHeader->format_bit & VBAN_DATATYPE_MASK;
sampleSize = VBAN_SampleSize[BitResolution];
nbSample =((long)lpHeader->format_nbs)+1;
nbByte = sampleSize * nbChannel * nbSample;
//Push Data in Audio Stack (to be sent to audio device output for
//example) NOTE that waiting cycles are not allowed in this thread.
if (fReserved == 0)
{
if (nbByte == datasize)
{
MyStream_PushSignal(pStreamObj, lpHeader+1, nbByte,
SR, nbChannel, BitResolution);
}
else nError_corrupt++
}
}
}
}
}
}
get full source code example of a VBAN-Receptor app for linux on github: https://github.com/quiniouben/vban_receptor
