def test_graph_render():
graph = AudioGraph()
sine = SineOscillator(440)
graph.play(sine)
with pytest.raises(RuntimeError):
graph.render(441000)
del graph
def test_graph_dummy_audioout():
output = AudioOut_Dummy(2)
graph = AudioGraph(output_device=output)
sine = SineOscillator([ 220, 440 ])
graph.play(sine)
graph.render(1024)
samples = graph.output.output_buffer[0][:1024]
assert len(samples) == 1024
del graph
def test_expansion_upmix():
output = AudioOut_Dummy(4)
graph = AudioGraph(output_device=output)
a = SquareOscillator([440, 880, 1320], [0.3, 0.7])
assert a.num_input_channels == 3
assert a.num_output_channels == 3
process_tree(a)
assert np.all(a.inputs["frequency"].output_buffer[0] == 440.0)
assert np.all(a.inputs["frequency"].output_buffer[1] == 880.0)
assert np.all(a.inputs["frequency"].output_buffer[2] == 1320.0)
assert np.all(a.inputs["width"].output_buffer[0] == 0.3)
assert np.all(a.inputs["width"].output_buffer[1] == 0.7)
assert np.all(a.inputs["width"].output_buffer[2] == 0.0)
assert count_zero_crossings(a.output_buffer[0]) == math.ceil(
440 * DEFAULT_BUFFER_LENGTH / graph.sample_rate)
assert count_zero_crossings(a.output_buffer[1]) == math.ceil(
880 * DEFAULT_BUFFER_LENGTH / graph.sample_rate)
assert count_zero_crossings(a.output_buffer[2]) == 0
#--------------------------------------------------------------------------------
# When processed through a Graph, multichannel expansion duplicates the
# 2-channel width node to become 3-channel
#--------------------------------------------------------------------------------
a = SquareOscillator([440, 880, 1320], [0.3, 0.7])
graph.play(a)
graph.render(1024)
assert graph.node_count == 4
assert np.all(a.inputs["frequency"].output_buffer[0] == 440.0)
assert np.all(a.inputs["frequency"].output_buffer[1] == 880.0)
assert np.all(a.inputs["frequency"].output_buffer[2] == 1320.0)
assert np.all(a.inputs["width"].output_buffer[0] == 0.3)
assert np.all(a.inputs["width"].output_buffer[1] == 0.7)
assert np.all(a.inputs["width"].output_buffer[2] == 0.3)
assert count_zero_crossings(a.output_buffer[0]) == math.ceil(
440 * DEFAULT_BUFFER_LENGTH / graph.sample_rate)
assert count_zero_crossings(a.output_buffer[1]) == math.ceil(
880 * DEFAULT_BUFFER_LENGTH / graph.sample_rate)
assert count_zero_crossings(a.output_buffer[2]) == math.ceil(
1320 * DEFAULT_BUFFER_LENGTH / graph.sample_rate)
graph.stop(a)
graph.render(1024)
#--------------------------------------------------------------------------------
# Only remaining note is the abstract audio output node
#--------------------------------------------------------------------------------
assert graph.node_count == 1