CPPUNIT_ASSERT_EQUAL (0, src1->input_signature()->max_streams ());
CPPUNIT_ASSERT_EQUAL (1, src1->output_signature()->min_streams ());
CPPUNIT_ASSERT_EQUAL (1, src1->output_signature()->max_streams ());
CPPUNIT_ASSERT_EQUAL (0, src1->input_signature()->max_streams ());
CPPUNIT_ASSERT_EQUAL (1, src1->output_signature()->min_streams ());
CPPUNIT_ASSERT_EQUAL (1, src1->output_signature()->max_streams ());