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audiograph: a C graph runner over the existing kernels (MicroPython only) - #297
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…ython only) One Graph object owns the block buffers and a list of nodes; run() renders every enabled node in order and writes the OUT node into a caller's buffer. The kernels are the oscillator, ladder, float biquad and feedback delay as they stand, plus small new nodes a voice needs: an ADSR (vrack's EnvelopeCore per sample), a triangle LFO, white noise, a mixer with ramped gains, a VCA and a constant. No existing node file changes.
…nly) One audiograph.Graph renders a whole patch per block: nodes over the oscillator, ladder, float biquad and feedback delay kernels, plus an ADSR, a triangle LFO, white noise, a mixer with ramped gains, a VCA and the output stage, wired through the graph's own int16 block buffers, each node in a group a run can mask out. Nothing in Python runs between the nodes, which is what lets a six-voice polysynth built from these kernels play in real time on an ESP32-P4 (the vrack Poly106: four voices held at factor 1.3 where the rack held none). tests/parity/graph_probe.py holds the runner to its wiring, its nodes, its groups, the mixer ramp and the output node, and each of its planted faults (a mixer added before the node it reads, a filter left out of the chain, a cutoff sent to a node no output reads) fails; clean-build.yml runs the faults first. docs/audiograph.md is the user's page. The CPython and CircuitPython bindings are on the roadmap.
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audiograph.Graphrenders a whole patch per block: nodes over the oscillator, ladder, float biquad and feedback delay kernels, plus an ADSR, a triangle LFO, white noise, a mixer with ramped gains, a VCA and the output stage, wired through the graph's own int16 block buffers, each node in a group a run can mask out. Nothing in Python runs between the nodes, which is what lets a six-voice polysynth built from these kernels play in real time on an ESP32-P4.No existing node file changes. New:
src/shared/audiodsp_graph.{h,c}(runtime-neutral),src/audiograph/(the MicroPython binding),docs/audiograph.md,tests/parity/graph_probe.pywith three planted faults that clean-build.yml runs first, a README section and a roadmap line for the CPython and CircuitPython bindings.Measured on the ESP32-P4 DEV-KIT at a 128-frame block: the vrack Poly106 as a graph holds four voices at real-time factor 1.3 and six at 0.95, where the same patch run node by node from Python held none.