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// Create an audio graph on an offline context that consists of a
// constant source and two gain nodes. One of the nodes is the node te
// be tested and the other is the reference node. The output from the
// test node is in channel 0 of the offline context; the reference
// node is in channel 1.
//
// Returns a dictionary with the context, source node, the test node,
// and the reference node.
function setupRetrospectiveGraph() {
// Use a sample rate that is a power of two to eliminate round-off
// in computing the currentTime.
let context = new OfflineAudioContext(2, 16384, 16384);
let source = new ConstantSourceNode(context);
let test = new GainNode(context);
let reference = new GainNode(context);
source.connect(test);
source.connect(reference);
let merger = new ChannelMergerNode(
context, {numberOfInputs: context.destination.channelCount});
test.connect(merger, 0, 0);
reference.connect(merger, 0, 1);
merger.connect(context.destination);
return {context: context, source: source, test: test, reference: reference};
}
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