// From buffer
bool ResourceRecord::fromBuffer(unsigned char* buf, size_t size, size_t &offset)
{
// Header
if (m_name.fromBuffer(buf, size, offset))
{
if (size - offset >= 10)
{
m_type = ntohs(*(uint16_t*)(buf + offset));
offset += 2;
m_class = ntohs(*(uint16_t*)(buf + offset));
offset += 2;
m_ttl = ntohl(*(uint32_t*)(buf + offset));
offset += 4;
m_rdlen = ntohs(*(uint16_t*)(buf + offset));
offset += 2;
return dataFromBuffer(buf, size, offset);
}
}
return false;
}
QVideoFrame MFTransform::makeVideoFrame()
{
QVideoFrame frame;
if (!m_format.isValid())
return frame;
IMFMediaBuffer *buffer = 0;
do {
if (FAILED(m_sample->ConvertToContiguousBuffer(&buffer)))
break;
QByteArray array = dataFromBuffer(buffer, m_format.frameHeight(), &m_bytesPerLine);
if (array.isEmpty())
break;
// Wrapping IMFSample or IMFMediaBuffer in a QVideoFrame is not possible because we cannot hold
// IMFSample for a "long" time without affecting the rest of the topology.
// If IMFSample is held for more than 5 frames decoder starts to reuse it even though it hasn't been released it yet.
// That is why we copy data from IMFMediaBuffer here.
frame = QVideoFrame(new QMemoryVideoBuffer(array, m_bytesPerLine), m_format.frameSize(), m_format.pixelFormat());
// WMF uses 100-nanosecond units, Qt uses microseconds
LONGLONG startTime = -1;
if (SUCCEEDED(m_sample->GetSampleTime(&startTime))) {
frame.setStartTime(startTime * 0.1);
LONGLONG duration = -1;
if (SUCCEEDED(m_sample->GetSampleDuration(&duration)))
frame.setEndTime((startTime + duration) * 0.1);
}
} while (false);
if (buffer)
buffer->Release();
return frame;
}
