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AudioProcessorGraph: Fix bug where channel delays could incorrectly be applied multiple times

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reuk 2025-06-19 13:37:04 +01:00
parent 8d935b25b2
commit b0a3be2bb4
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1 changed files with 91 additions and 10 deletions
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101
modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
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@ -1193,18 +1193,25 @@ private:
jassert (bufIndex >= 0);
}
if (inputChan < numOuts && isBufferNeededLater (reversed, ourRenderingIndex, inputChan, src))
const auto nodeDelay = getNodeDelay (src.nodeID);
const auto needsDelay = nodeDelay < maxLatency;
if ((inputChan < numOuts || needsDelay)
&& isBufferNeededLater (reversed, ourRenderingIndex, inputChan, src))
{
// can't mess up this channel because it's needed later by another node,
// so we need to use a copy of it..
// We can't modify this channel because it's needed later by another node,
// so we need to use a copy of it.
// If the input channel index matches any output channel index, this implies that
// the output would overwrite the content of the input buffer.
// If the input needs to be delayed by some amount, this will modify the buffer
// in-place which will produce the wrong delay if a subsequent input needs a
// different delay value.
auto newFreeBuffer = getFreeBuffer (audioBuffers);
sequence.addCopyChannelOp (bufIndex, newFreeBuffer);
bufIndex = newFreeBuffer;
}
auto nodeDelay = getNodeDelay (src.nodeID);
if (nodeDelay < maxLatency)
if (needsDelay)
sequence.addDelayChannelOp (bufIndex, maxLatency - nodeDelay);
return bufIndex;
@ -2144,6 +2151,8 @@ public:
void runTest() override
{
const ScopedJuceInitialiser_GUI scope;
const auto midiChannel = AudioProcessorGraph::midiChannelIndex;
beginTest ("isConnected returns true when two nodes are connected");
@ -2330,6 +2339,66 @@ public:
// not a supported usage pattern.
}
beginTest ("When a delayed channel is used as an input to multiple nodes, the delay is applied appropriately for each node");
{
AudioProcessorGraph graph;
graph.setBusesLayout ({ { AudioChannelSet::stereo() }, { AudioChannelSet::mono() } });
const auto nodeA = graph.addNode (BasicProcessor::make (BasicProcessor::getStereoInMonoOut(), MidiIn::no, MidiOut::no));
const auto nodeB = graph.addNode (BasicProcessor::make (BasicProcessor::getStereoInMonoOut(), MidiIn::no, MidiOut::no));
const auto nodeC = graph.addNode (BasicProcessor::make (BasicProcessor::getStereoInMonoOut(), MidiIn::no, MidiOut::no));
const auto input = graph.addNode (std::make_unique<AudioProcessorGraph::AudioGraphIOProcessor> (AudioProcessorGraph::AudioGraphIOProcessor::IODeviceType::audioInputNode));
const auto output = graph.addNode (std::make_unique<AudioProcessorGraph::AudioGraphIOProcessor> (AudioProcessorGraph::AudioGraphIOProcessor::IODeviceType::audioOutputNode));
constexpr auto latencySamples = 2;
nodeA->getProcessor()->setLatencySamples (latencySamples);
// [input 0 1] 0 and 1 denote input/output channels
// | |
// | |
// [nodeA 0 1] | nodeA has latency applied
// | /|
// | / |
// [nodeB 0 1] | each node sums all input channels onto the first output channel
// | /
// | /
// [nodeC 0 1]
// |
// |
// [out 0]
expect (graph.addConnection ({ { input->nodeID, 0}, { nodeA->nodeID, 0} }));
expect (graph.addConnection ({ { input->nodeID, 1}, { nodeB->nodeID, 1} }));
expect (graph.addConnection ({ { input->nodeID, 1}, { nodeC->nodeID, 1} }));
expect (graph.addConnection ({ { nodeA->nodeID, 0}, { nodeB->nodeID, 0} }));
expect (graph.addConnection ({ { nodeB->nodeID, 0}, { nodeC->nodeID, 0} }));
expect (graph.addConnection ({ { nodeC->nodeID, 0}, { output->nodeID, 0} }));
graph.rebuild();
constexpr auto blockSize = 128;
graph.prepareToPlay (44100.0, blockSize);
expect (graph.getLatencySamples() == latencySamples);
AudioBuffer<float> audio (2, blockSize);
audio.clear();
audio.setSample (1, 0, 1.0f);
MidiBuffer midi;
graph.processBlock (audio, midi);
// The impulse should arrive at nodes B and C simultaneously, so the end result should
// be a double-amplitude impulse with the latency of node A applied
for (auto i = 0; i < blockSize; ++i)
{
const auto expected = i == latencySamples ? 2.0f : 0.0f;
expect (exactlyEqual (audio.getSample (0, i), expected));
}
}
beginTest ("large render sequence can be built");
{
AudioProcessorGraph graph;
@ -2368,7 +2437,7 @@ private:
class BasicProcessor final : public AudioProcessor
{
public:
explicit BasicProcessor (const AudioProcessor::BusesProperties& layout, MidiIn mIn, MidiOut mOut)
explicit BasicProcessor (const BusesProperties& layout, MidiIn mIn, MidiOut mOut)
: AudioProcessor (layout), midiIn (mIn), midiOut (mOut) {}
const String getName() const override { return "Basic Processor"; }
@ -2382,7 +2451,7 @@ private:
void setCurrentProgram (int) override {}
const String getProgramName (int) override { return {}; }
void changeProgramName (int, const String&) override {}
void getStateInformation (juce::MemoryBlock&) override {}
void getStateInformation (MemoryBlock&) override {}
void setStateInformation (const void*, int) override {}
void prepareToPlay (double, int) override {}
void releaseResources() override {}
@ -2391,14 +2460,20 @@ private:
void reset() override {}
void setNonRealtime (bool) noexcept override {}
void processBlock (AudioBuffer<float>&, MidiBuffer&) override
void processBlock (AudioBuffer<float>& audio, MidiBuffer&) override
{
blockPrecision = singlePrecision;
for (auto i = 1; i < audio.getNumChannels(); ++i)
audio.addFrom (0, 0, audio.getReadPointer (i), audio.getNumSamples());
}
void processBlock (AudioBuffer<double>&, MidiBuffer&) override
void processBlock (AudioBuffer<double>& audio, MidiBuffer&) override
{
blockPrecision = doublePrecision;
for (auto i = 1; i < audio.getNumChannels(); ++i)
audio.addFrom (0, 0, audio.getReadPointer (i), audio.getNumSamples());
}
static std::unique_ptr<BasicProcessor> make (const BusesProperties& layout,
@ -2419,6 +2494,12 @@ private:
.withOutput ("out", AudioChannelSet::stereo());
}
static BusesProperties getStereoInMonoOut()
{
return BusesProperties().withInput ("in", AudioChannelSet::stereo())
.withOutput ("out", AudioChannelSet::mono());
}
static BusesProperties getMultichannelProperties (int numChannels)
{
return BusesProperties().withInput ("in", AudioChannelSet::discreteChannels (numChannels))