def test_loopback_rand_rs_int(self): """ Loopback of data, (de)randomiser, rs (en/de)coder, (de)interleaver """ src_data = make_transport_stream() # Disregard end bytes of source data, accounting for interleaver delay expected_delay = dvb_interleaver_bb.DELAY * \ dvb_swig.MPEG_TS_PKT_LENGTH / dvb_swig.DVB_RS_ENCODED_LENGTH expected_result = tuple(src_data[:-expected_delay]) src = gr.vector_source_b(src_data) txpad = dvb_swig.pad_mpeg_ts_packet_bp() randomizer = dvb_swig.randomizer_pp() rs_encoder = dvb_swig.rs_encoder_pp() txdepad = dvb_swig.depad_dvb_packet_rs_encoded_pb() interleaver = dvb_interleaver_bb.interleaver_bb() deinterleaver = dvb_interleaver_bb.deinterleaver_bb() rxpad = dvb_swig.pad_dvb_packet_rs_encoded_bp() rs_decoder = dvb_swig.rs_decoder_pp() derandomizer = dvb_swig.derandomizer_pp() rxdepad = dvb_swig.depad_mpeg_ts_packet_pb() dst = gr.vector_sink_b() # Connect and run self.tb.connect(src, txpad, randomizer, rs_encoder, txdepad, interleaver, deinterleaver) self.tb.connect(deinterleaver, rxpad, rs_decoder, derandomizer, rxdepad, dst) self.tb.run() # Check that the decoded bytes are the same as original self.assertEqual(expected_result, dst.data())
def test_interleaver_bb(self): """ DVB convolutional interleaver, deinterleaver and their associated delays """ data_length = 3000 src_data = [i % 256 for i in range(data_length)] # Ensure that we check for longer than fixed delay of 2244 bytes total to be meaningful self.assertTrue(data_length > dvb_interleaver_bb.DELAY) # We expect only the bytes prior to DELAY - they're still in the shift registers expected_result = tuple(src_data[:-dvb_interleaver_bb.DELAY]) src = gr.vector_source_b(src_data) interleaver = dvb_interleaver_bb.interleaver_bb() deinterleaver = dvb_interleaver_bb.deinterleaver_bb() dst = gr.vector_sink_b() self.tb.connect(src, interleaver, deinterleaver, dst) self.tb.run() self.assertEqual(expected_result, dst.data())
