def __init__(self, host, port, pkt_size, sample_rate, eof):
gr.top_block.__init__(self, "dial_tone_source")
amplitude = 0.3
src0 = analog.sig_source_f(sample_rate, analog.OC_SIN_WAVE, 350, amplitude)
src1 = analog.sig_source_f(sample_rate, analog.OC_SIN_WAVE, 440, amplitude)
add = blocks.add_ff()
# Throttle needed here to account for the other side's audio card sampling rate
thr = blocks.throttle(gr.sizeof_float, sample_rate)
sink = blocks.udp_sink(gr.sizeof_float, host, port, pkt_size, eof=eof)
self.connect(src0, (add, 0))
self.connect(src1, (add, 1))
self.connect(add, thr, sink)
def add_ff(N):
op = blocks.add_ff()
tb = helper(N, op, gr.sizeof_float, gr.sizeof_float, 2, 1)
return tb
