listener_ptr makeStreamListener(StreamingDevice* dev, ClientConn* client, JSONNode &n){
std::auto_ptr<WSStreamListener> listener(new WSStreamListener());
listener->id = jsonIntProp(n, "id");
listener->device = dev;
listener->client = client;
listener->decimateFactor = jsonIntProp(n, "decimateFactor", 1);
// Prevent divide by 0
if (listener->decimateFactor == 0) listener->decimateFactor = 1;
int start = jsonIntProp(n, "start", -1);
if (start < 0){ // Negative indexes are relative to latest sample
start = (dev->buffer_max()) + start + 1;
}
if (start < 0) listener->index = 0;
else listener->index = start;
listener->count = jsonIntProp(n, "count");
JSONNode j_streams = n.at("streams");
for(JSONNode::iterator i=j_streams.begin(); i!=j_streams.end(); i++){
listener->streams.push_back(
dev->findStream(
jsonStringProp(*i, "channel"),
jsonStringProp(*i, "stream")));
}
JSONNode::iterator t = n.find("trigger");
if (t != n.end() && (t->type()) == JSON_NODE){
JSONNode &trigger = *t;
string type = jsonStringProp(trigger, "type", "in");
if (type == "in"){
listener->triggerType = INSTREAM;
listener->triggerLevel = jsonFloatProp(trigger, "level");
listener->triggerStream = dev->findStream(
jsonStringProp(trigger, "channel"),
jsonStringProp(trigger, "stream"));
}else if (type == "out"){
listener->triggerType = OUTSOURCE;
listener->triggerChannel = dev->channelById(jsonStringProp(trigger, "channel"));
if (!listener->triggerChannel) throw ErrorStringException("Trigger channel not found");
}else{
throw ErrorStringException("Invalid trigger type");
}
listener->triggerRepeat = jsonBoolProp(trigger, "repeat", true);
listener->triggerHoldoff = jsonIntProp(trigger, "holdoff", 0);
listener->triggerOffset = jsonIntProp(trigger, "offset", 0);
if (listener->triggerOffset<0 && -listener->triggerOffset >= listener->triggerHoldoff){
// Prevent big negative offsets that could cause infinite loops
listener->triggerHoldoff = -listener->triggerOffset;
}
listener->triggerForce = jsonIntProp(trigger, "force", 0);
listener->triggerForceIndex = listener->index + listener->triggerForce;
}
return listener_ptr(listener.release());
}
inline bool jsonBoolProp(JSONNode &n, const char* prop, bool def){
JSONNode::iterator i = n.find(prop);
if (i != n.end() && i->type() == JSON_BOOL) return i->as_bool();
else return def;
}
inline double jsonFloatProp(JSONNode &n, const char* prop, double def){
JSONNode::iterator i = n.find(prop);
if (i != n.end() && i->type() == JSON_NUMBER) return i->as_float();
else return def;
}
inline int jsonIntProp(JSONNode &n, const char* prop, int def){
JSONNode::iterator i = n.find(prop);
if (i != n.end() && i->type() == JSON_NUMBER) return i->as_int();
else return def;
}
inline string jsonStringProp(JSONNode &n, const char* prop, string def){
JSONNode::iterator i = n.find(prop);
if (i != n.end() && i->type() == JSON_STRING) return i->as_string();
else return def;
}
inline double jsonFloatProp(JSONNode &n, const char* prop){
JSONNode::iterator i = n.find(prop);
if (i != n.end() && i->type() == JSON_NUMBER) return i->as_float();
else throw ErrorStringException(string("JSON missing float property: ") + prop);
}
inline bool jsonBoolProp(JSONNode &n, const char* prop){
JSONNode::iterator i = n.find(prop);
if (i != n.end() && i->type() == JSON_BOOL) return i->as_bool();
else throw ErrorStringException(string("JSON missing bool property: ") + prop);
}
inline string jsonStringProp(JSONNode &n, const char* prop){
JSONNode::iterator i = n.find(prop);
if (i != n.end() && i->type() == JSON_STRING) return i->as_string();
else throw ErrorStringException(string("JSON missing string property: ") + prop);
}