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Ancillary Data

Quadro SDI Output PG-03776-001_v06 | 40

m_pRingBuffer->NumValidSamples(0);

m_AncData.AudioGroup4.audioData[0] = m_pRingBuffer->GetBuffer(0);

m_AncData.AudioGroup4.audioData[1] = m_pRingBuffer->GetBuffer(1);

m_AncData.AudioGroup4.audioData[2] = m_pRingBuffer->GetBuffer(0);

m_AncData.AudioGroup4.audioData[3] = m_pRingBuffer->GetBuffer(1);

// Increment frame sequence number.

// When sequence length reached, reset.

frameSequenceNum++;

if (frameSequenceNum == m_uiSequenceLength)

frameSequenceNum = 0;

6.5 CUSTOM DATA

An application can also send custom ancillary data packets. In this case, in addition to

specifying the custom data, an application must also specify the ancillary data packet

data identification (DID, secondary data identification (SDID) and data count (DC)

words as well as the checksum (CS) word for each custom data packet. Custom ancillary

data packets are placed in the VANC region of the video stream. Code Listing 36

illustrates how this can be done.

Code Listing 36: Specifying Custom Data

// Create custom packet(s)

ancData.fields |= NVVIOANCDATAFRAME_CUSTOM;

#define NUM_CUSTOM_PACKETS 255

NVVIOANCDATAPACKET customPackets[NUM_CUSTOM_PACKETS];

for (int i = 0; i < NUM_CUSTOM_PACKETS; i++) {

customPackets[i].version = NVVIOANCDATAPACKET_VERSION;

customPackets[i].DID = 0x69;

customPackets[i].SDID = 0x69;

customPackets[i].DC = 0xff;

customPackets[i].CS = 0x0; //

for (NvU8 j = 0; j < customPackets[i].DC; j++) {

customPackets[i].data[j] = j;

}

ancData.numCustomPackets = NUM_CUSTOM_PACKETS;

ancData.CustomPackets = &customPackets[0];

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SDI Technologies iH30 Dokumentacja Strona 45