pylibresidfp
pybind11 binding of libresidfp v1.2.3 (the reSIDfp SID emulator) with chip state save/restore, a deterministic output and a GIL-free render loop.
from pylibresidfp import SID
sid = SID(model="6581", clock_hz=985248.0, sampling_hz=44100.0, method="decimate", filter=True)
sid.write(24, 15); sid.read(27); sid.peek(27); sid.reset()
sid.cycle # absolute cycle count, starts at 0
sid.clock(cycles) # np.int16 samples for those cycles
sid.run(writes, until) # writes: (N, 3) ints or [(cycle, reg, value), ...], absolute cycles
sid.serve(writes, cycle, reg) # run to `cycle`, then read(reg): the body of a NativeSid on_read
state = sid.save_state(); sid.restore_state(state)
twin = sid.copy() # same parameters and state; SID is also picklable
run clocks to each write's cycle, writes it, then clocks to until. Write cycles must not
precede sid.cycle or each other and must not exceed until; violations raise ValueError.
serve discards the samples it produces (use run to keep audio).
clock, run, serve, save_state and restore_state release the GIL. Each instance has a busy
flag: use from a second thread while a call is in progress raises RuntimeError. Distinct
instances run in parallel.
Fed directly from vagrant_moses: sid.run(native_sid.drain_writes(), until).
Determinism
Two instances with the same parameters and writes produce identical samples, for both models and
both methods. Upstream v1.2.3 dithers the filter's float-to-int conversion from a table indexed by
a counter held in the process-wide filter-model singleton; patches/0001-deterministic-rounding.patch
(applied at build time) replaces the dither with plain rounding. Other process-wide state is
immutable after first use (filter and waveform tables). The static setters
Filter6581::setFilterRange/setCaps are not exposed. v1.2.3 has no noiseLevel, so there is no
noise_level option.
State is not portable across builds. sid.cycle is part of the saved state.
Build
git clone --recurse-submodules, then pip install .. Needs CMake >= 3.20, patch and a C++17
compiler. libresidfp is the submodule extern/libresidfp (tag v1.2.3); the build copies its
sources and applies patches/ to the copy. Tests: pip install -e .[dev], then
pytest -n auto --cov=pylibresidfp. docker build . (build arg PYTHON_VERSION) runs the full
lint and test suite.
GPL-2.0-or-later (see COPYING).
1 maintainer
Metadata
1 maintainer
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