Your emitter seems to be sending some sort of home-brew code.
I don't use the IR librairies so I can't help you with that. Maybe if you give the output from the following sketch, someone else will be able to help you.
int pin = 7;
unsigned long duration;
void setup()
{
Serial.begin(115200);
pinMode(pin, INPUT);
}
void loop()
{
duration = pulseIn(pin, LOW);
if(duration)
Serial.println(duration);
}
If not, you're going to have to do some reading.