I've got a question relating to the zmq sub source.
I've got a flowgraph that has rtlsdr -> pub sink
In another graph, I decode FM radio using WBFM receive.
I noticed that it sounds horrible and choppy (sped up).
I looked in the code of the sub source, and saw this
// Copy to output buffer and return
if (msg.size() >= d_itemsize*noutput_items)
{
memcpy(out, (void *) msg.data(), d_itemsize*noutput_items);
return noutput_items;
} else
{
memcpy(out, (void *) msg.data(), msg.size());
return msg.size() / (d_itemsize);
}
Does this mean that if the message size is greater then the number of items requested by scheduler * item size (e.g. complex = 8), the rest of the message is simply dropped?
This is probably the reason for the choppy audio. How can a situation like this be avoided?