Metadata-Version: 2.4
Name: preframr-tokens
Version: 0.54.0
Summary: White-box SID decompiler codec: register dump -> inline op-program tokens, residual-zero at < 1 token/frame.
Author: Anarkiwi
License:                                  Apache License
                                   Version 2.0, January 2004
                                http://www.apache.org/licenses/
        
           TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
        
           1. Definitions.
        
              "License" shall mean the terms and conditions for use, reproduction,
              and distribution as defined by Sections 1 through 9 of this document.
        
              "Licensor" shall mean the copyright owner or entity authorized by
              the copyright owner that is granting the License.
        
              "Legal Entity" shall mean the union of the acting entity and all
              other entities that control, are controlled by, or are under common
              control with that entity. For the purposes of this definition,
              "control" means (i) the power, direct or indirect, to cause the
              direction or management of such entity, whether by contract or
              otherwise, or (ii) ownership of fifty percent (50%) or more of the
              outstanding shares, or (iii) beneficial ownership of such entity.
        
              "You" (or "Your") shall mean an individual or Legal Entity
              exercising permissions granted by this License.
        
              "Source" form shall mean the preferred form for making modifications,
              including but not limited to software source code, documentation
              source, and configuration files.
        
              "Object" form shall mean any form resulting from mechanical
              transformation or translation of a Source form, including but
              not limited to compiled object code, generated documentation,
              and conversions to other media types.
        
              "Work" shall mean the work of authorship, whether in Source or
              Object form, made available under the License, as indicated by a
              copyright notice that is included in or attached to the work
              (an example is provided in the Appendix below).
        
              "Derivative Works" shall mean any work, whether in Source or Object
              form, that is based on (or derived from) the Work and for which the
              editorial revisions, annotations, elaborations, or other modifications
              represent, as a whole, an original work of authorship. For the purposes
              of this License, Derivative Works shall not include works that remain
              separable from, or merely link (or bind by name) to the interfaces of,
              the Work and Derivative Works thereof.
        
              "Contribution" shall mean any work of authorship, including
              the original version of the Work and any modifications or additions
              to that Work or Derivative Works thereof, that is intentionally
              submitted to Licensor for inclusion in the Work by the copyright owner
              or by an individual or Legal Entity authorized to submit on behalf of
              the copyright owner. For the purposes of this definition, "submitted"
              means any form of electronic, verbal, or written communication sent
              to the Licensor or its representatives, including but not limited to
              communication on electronic mailing lists, source code control systems,
              and issue tracking systems that are managed by, or on behalf of, the
              Licensor for the purpose of discussing and improving the Work, but
              excluding communication that is conspicuously marked or otherwise
              designated in writing by the copyright owner as "Not a Contribution."
        
              "Contributor" shall mean Licensor and any individual or Legal Entity
              on behalf of whom a Contribution has been received by Licensor and
              subsequently incorporated within the Work.
        
           2. Grant of Copyright License. Subject to the terms and conditions of
              this License, each Contributor hereby grants to You a perpetual,
              worldwide, non-exclusive, no-charge, royalty-free, irrevocable
              copyright license to reproduce, prepare Derivative Works of,
              publicly display, publicly perform, sublicense, and distribute the
              Work and such Derivative Works in Source or Object form.
        
           3. Grant of Patent License. Subject to the terms and conditions of
              this License, each Contributor hereby grants to You a perpetual,
              worldwide, non-exclusive, no-charge, royalty-free, irrevocable
              (except as stated in this section) patent license to make, have made,
              use, offer to sell, sell, import, and otherwise transfer the Work,
              where such license applies only to those patent claims licensable
              by such Contributor that are necessarily infringed by their
              Contribution(s) alone or by combination of their Contribution(s)
              with the Work to which such Contribution(s) was submitted. If You
              institute patent litigation against any entity (including a
              cross-claim or counterclaim in a lawsuit) alleging that the Work
              or a Contribution incorporated within the Work constitutes direct
              or contributory patent infringement, then any patent licenses
              granted to You under this License for that Work shall terminate
              as of the date such litigation is filed.
        
           4. Redistribution. You may reproduce and distribute copies of the
              Work or Derivative Works thereof in any medium, with or without
              modifications, and in Source or Object form, provided that You
              meet the following conditions:
        
              (a) You must give any other recipients of the Work or
                  Derivative Works a copy of this License; and
        
              (b) You must cause any modified files to carry prominent notices
                  stating that You changed the files; and
        
              (c) You must retain, in the Source form of any Derivative Works
                  that You distribute, all copyright, patent, trademark, and
                  attribution notices from the Source form of the Work,
                  excluding those notices that do not pertain to any part of
                  the Derivative Works; and
        
              (d) If the Work includes a "NOTICE" text file as part of its
                  distribution, then any Derivative Works that You distribute must
                  include a readable copy of the attribution notices contained
                  within such NOTICE file, excluding those notices that do not
                  pertain to any part of the Derivative Works, in at least one
                  of the following places: within a NOTICE text file distributed
                  as part of the Derivative Works; within the Source form or
                  documentation, if provided along with the Derivative Works; or,
                  within a display generated by the Derivative Works, if and
                  wherever such third-party notices normally appear. The contents
                  of the NOTICE file are for informational purposes only and
                  do not modify the License. You may add Your own attribution
                  notices within Derivative Works that You distribute, alongside
                  or as an addendum to the NOTICE text from the Work, provided
                  that such additional attribution notices cannot be construed
                  as modifying the License.
        
              You may add Your own copyright statement to Your modifications and
              may provide additional or different license terms and conditions
              for use, reproduction, or distribution of Your modifications, or
              for any such Derivative Works as a whole, provided Your use,
              reproduction, and distribution of the Work otherwise complies with
              the conditions stated in this License.
        
           5. Submission of Contributions. Unless You explicitly state otherwise,
              any Contribution intentionally submitted for inclusion in the Work
              by You to the Licensor shall be under the terms and conditions of
              this License, without any additional terms or conditions.
              Notwithstanding the above, nothing herein shall supersede or modify
              the terms of any separate license agreement you may have executed
              with Licensor regarding such Contributions.
        
           6. Trademarks. This License does not grant permission to use the trade
              names, trademarks, service marks, or product names of the Licensor,
              except as required for reasonable and customary use in describing the
              origin of the Work and reproducing the content of the NOTICE file.
        
           7. Disclaimer of Warranty. Unless required by applicable law or
              agreed to in writing, Licensor provides the Work (and each
              Contributor provides its Contributions) on an "AS IS" BASIS,
              WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
              implied, including, without limitation, any warranties or conditions
              of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
              PARTICULAR PURPOSE. You are solely responsible for determining the
              appropriateness of using or redistributing the Work and assume any
              risks associated with Your exercise of permissions under this License.
        
           8. Limitation of Liability. In no event and under no legal theory,
              whether in tort (including negligence), contract, or otherwise,
              unless required by applicable law (such as deliberate and grossly
              negligent acts) or agreed to in writing, shall any Contributor be
              liable to You for damages, including any direct, indirect, special,
              incidental, or consequential damages of any character arising as a
              result of this License or out of the use or inability to use the
              Work (including but not limited to damages for loss of goodwill,
              work stoppage, computer failure or malfunction, or any and all
              other commercial damages or losses), even if such Contributor
              has been advised of the possibility of such damages.
        
           9. Accepting Warranty or Additional Liability. While redistributing
              the Work or Derivative Works thereof, You may choose to offer,
              and charge a fee for, acceptance of support, warranty, indemnity,
              or other liability obligations and/or rights consistent with this
              License. However, in accepting such obligations, You may act only
              on Your own behalf and on Your sole responsibility, not on behalf
              of any other Contributor, and only if You agree to indemnify,
              defend, and hold each Contributor harmless for any liability
              incurred by, or claims asserted against, such Contributor by reason
              of your accepting any such warranty or additional liability.
        
           END OF TERMS AND CONDITIONS
        
           APPENDIX: How to apply the Apache License to your work.
        
              To apply the Apache License to your work, attach the following
              boilerplate notice, with the fields enclosed by brackets "[]"
              replaced with your own identifying information. (Don't include
              the brackets!)  The text should be enclosed in the appropriate
              comment syntax for the file format. We also recommend that a
              file or class name and description of purpose be included on the
              same "printed page" as the copyright notice for easier
              identification within third-party archives.
        
           Copyright [yyyy] [name of copyright owner]
        
           Licensed under the Apache License, Version 2.0 (the "License");
           you may not use this file except in compliance with the License.
           You may obtain a copy of the License at
        
               http://www.apache.org/licenses/LICENSE-2.0
        
           Unless required by applicable law or agreed to in writing, software
           distributed under the License is distributed on an "AS IS" BASIS,
           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
           See the License for the specific language governing permissions and
           limitations under the License.
        
Project-URL: Homepage, https://github.com/anarkiwi/preframr-tokens
Project-URL: Source, https://github.com/anarkiwi/preframr-tokens
Project-URL: Issues, https://github.com/anarkiwi/preframr-tokens/issues
Keywords: sid,c64,preframr,tokenizer,codec
Classifier: License :: OSI Approved :: Apache Software License
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.10
Classifier: Programming Language :: Python :: 3.11
Classifier: Programming Language :: Python :: 3.12
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Requires-Python: >=3.10
Description-Content-Type: text/markdown
License-File: LICENSE
Requires-Dist: numpy>=1.24
Requires-Dist: numba>=0.60
Requires-Dist: pandas>=2
Requires-Dist: pyarrow>=14
Requires-Dist: py65>=1.2
Requires-Dist: pygoattracker>=0.1.6
Provides-Extra: dev
Requires-Dist: black>=24; extra == "dev"
Requires-Dist: coverage>=7; extra == "dev"
Requires-Dist: pylint>=3; extra == "dev"
Requires-Dist: pyright>=1.1; extra == "dev"
Requires-Dist: pytest>=7; extra == "dev"
Requires-Dist: pytest-cov>=4; extra == "dev"
Requires-Dist: pytest-xdist>=3.5; extra == "dev"
Dynamic: license-file

# preframr-tokens

The white-box SID decompiler codec. A C64 SID tune is **decompiled** into a
compact op-program — not a dense per-frame register stream — and that program
regenerates the original chip writes **byte-exact** (residual = 0). The whole
tune fits a small context window: every gate tune encodes well under 4096 tokens.
Extracted from the [preframr](https://github.com/anarkiwi/preframr) research
codebase.

Torch-free (numpy + pandas/pyarrow + [py65](https://pypi.org/project/py65/) for
the 6502 emulation, [pygoattracker](https://pypi.org/project/pygoattracker/) for
the GoatTracker backend). The training-side concerns (model, loss, DataLoader,
predict) live in the main `preframr` repo; this package is the encoding layer.

## The idea: `trace = VM(program)`

A SID register dump looks dense — per-frame vibrato, portamento, pulse-width
modulation, arpeggio, envelope ramps — but that density is *generated* by a tiny
fixed op-set running in the player. The frames are *playback*; the composer wrote
*steps*. So the codec recovers the **program**, never the per-frame trace.

### BACC — the bounded accumulator

The special-case effects (vibrato, slide, arp, PWM, ADSR, filter/pitch/pulse
sweeps) are not distinct generators. They are one primitive, the **bounded
accumulator (BACC)**:

> `value += rate every dwell frames`, with `boundary ∈ {wrap-N, reflect, none}`,
> `width ∈ {8, 12}` bits, and an output map `∈ {absolute, base+offset,
> note-table-scaled}` (or a table-walk).

They differ only in their parameters. A voice's whole modulation is one
straight-line PROGRAM of BACC ops. Per-instrument generators are
**pitch-invariant**: vibrato is a depth shift, arp a set of semitone offsets, PWM
a sweep rate — realized through the note table at render time, not stored
per-note. (Free-running modulation falls out naturally: phase is generator
*state*, not reset per note.)

Notes ride a **canonical 12-TET A440 grid**: the note token is the absolute
semitone index on a fixed A440 reference, computed from the onset frequency the
driver actually renders (`pitch.fn_to_grid`). So the same concert pitch is the
**same token across drivers** — a raw onset register write and GoatTracker's
note-table lookup both resolve to one grid index. This is what unifies the token
alphabet across engines.

The gate is **residual = 0, byte-exact**. A lossy codec trivially hits any token
budget, so the budgets only mean anything losslessly — `verify_residual` is the
invariant the codec is held to.

### The virtual machine / recover → render loop

The codec is a set of per-driver **backends**, selected by player fingerprint
(`backends/base.py: select_backend`). Each backend implements three methods:

- `matches(psid)` — does this backend handle the tune's playroutine?
- `recover(psid, nframes, subtune)` — run the playroutine white-box (py65,
  tapping driver RAM) and return a `BaccProgram` (score + pitch-invariant
  instrument generators + initial-state seed).
- `render(program)` — render the program back to a `(nframes, 25)` per-frame SID
  register array.

`recover_program` recovers the program; `render_program` renders it; and
`verify_residual` requires the rendered array to equal the ground-truth dump
**byte-exact** (modulo each backend's small declared don't-care mask, e.g. unused
PW-high bits). The shipped hand backend is **GoatTracker** (gt2reloc), kept as the
worked reference; every other tune is handled by the driver-agnostic **generic**
path (below). Both serialize into one shared token alphabet (the base-16 LEB digit
stream + `REPEAT` / `TRANSPOSE` markers), so a single learnable vocabulary spans
every driver.

Repeated phrases dedup via an **inline backward orderlist** — backward-reference
only, no forward declaration, no frozen table. Any prefix cut at an event
boundary is itself a valid, decodable, continuable song. A transposed phrase
repeat is a single `TRANSPOSE` op (a backward `REPEAT` whose copied notes are
re-coordinated by one constant grid-interval Δ), exactly what a tracker
orderlist's transpose does.

## Two-file input — and the shipped `.sid`-only path

The hand-backend codec is a **two-file** codec: it takes a `.sid` (the player +
song data) and a per-frame register `.dump.parquet` of the ground-truth chip
writes. It recovers the program by emulating the `.sid`, then verifies the render
against the dump. That dump is produced offline by the `anarkiwi/headlessvice`
VICE container.

The **generic** recovery now closes the migration to a **single input file**:

```python
from preframr_tokens.bacc.generic import recover_from_sid

# .sid ALONE -> BaccProgram(driver="generic"); NO .dump.parquet
program, resid, dump = recover_from_sid("Grid_Runner.sid")
assert sum(resid.values()) == 0   # whole-tune, all 25 registers, byte-exact
```

`recover_from_sid` runs the deterministic `preframr-sidtrace` tool ONCE over the
`.sid`, which emits BOTH the per-frame register dump (`.sidwr.bin`) and the bus
trace (`.bus.bin`) in-process. The generic fitter recovers the program from the
bus trace, and the render is verified residual-zero against the SAME-run dump —
the two are internally self-consistent (same emulator, same run). Validated
byte-exact on a range of drivers (e.g. **Grid_Runner**, GoatTracker) from the
`.sid` alone — one driver-agnostic path.

The binary is located via `SIDTRACE_BIN` (env), so the whole-tune residual-zero
test is **skip-if-binary-absent**: the default CI gate runs the committed-dump
oracle in a container with no `preframr-sidtrace` binary and stays self-contained
(no new hard external dependency).

## Install

```bash
pip install preframr-tokens
```

## Quick start

```python
import preframr_tokens as P

sid, dump = "Grid_Runner.sid", "Grid_Runner.1.dump.parquet"

# Recover the BACC program, verify it's byte-exact, serialize to token ids.
assert P.verify_residual(sid, dump, P.CPF)        # residual = 0 (lossless)
program = P.recover_program(sid, dump, P.CPF)     # .sid + .dump -> BaccProgram
ids = P.program_to_ids(program)                   # model-facing token id stream

breakdown, frames = P.measure(program)            # {block: tokens}, frame count
print(breakdown["total"], "tokens", "/", frames, "frames")

state = P.render_program(program)                 # BaccProgram -> (nframes, 25)
prog2 = P.ids_to_program(ids, driver=program.driver)  # round-trips byte-exact
```

## Public API

`preframr_tokens.__all__` is the promised surface; everything under
`preframr_tokens.bacc.*` and `preframr_tokens.codec.*` is internal and may move
between releases — depend on the root re-exports.

- `recover_program(sid, dump, cpf=CPF, subtune=0)` — `(.sid, .dump) → BaccProgram`.
- `render_program(program)` — `BaccProgram → (nframes, 25)` register state.
- `verify_residual(sid, dump, cpf=CPF, subtune=0)` — `True` iff render == dump,
  byte-exact (the gate).
- `program_to_ids(program)` / `ids_to_program(ids, driver=...)` — the model-facing
  token id stream (round-trips byte-exact to the program).
- `measure(program)` — `({block: tokens}, nframes)`; `breakdown["total"]` is the
  pre-BPE token count.
- `VOCAB` / `PAD_ID` — token alphabet size and the reserved padding id.
- `per_frame_state(dump, cpf, maxframes)` / `CPF` / `NTSC_CPF` /
  `cpf_from_meta(prefix)` — the dump reader + PAL/NTSC frame clock (`CPF` = 19656
  PAL cycles/frame, `NTSC_CPF` = 17095).

## The input dump format

A raw tune's register dump is a `.dump.parquet` of register writes captured from a
SID player, with at least the columns `clock` (absolute φ2 cycle), `reg` (0..24),
`val` (byte written), and `chipno` (only chip 0 is read). `per_frame_state`
reconstructs the 25-register state per absolute frame at the tune's frame clock.

Register map (`base = voice * 7`): +0/+1 freq lo/hi, +2/+3 pulse-width lo/hi,
+4 control (bit0 GATE, bit3 TEST, bits4–7 waveform), +5 AD, +6 SR. Globals:
21/22 filter cutoff lo/hi, 23 resonance/routing, 24 mode/volume.

## The gate / tests

The reference budget gate is
`tests/test_goattracker.py::test_grid_runner_context_budget`: it recovers the BACC
program from *Grid_Runner* (Jammer, GoatTracker), asserts `verify_residual` is
`True`, and requires both `< 1 token/frame` and the whole song `< 8192` tokens. Its
fixtures are auto-acquired (the `.sid` is downloaded, the dump rendered). The
generic path is exercised end-to-end (whole-tune residual-zero) in
`tests/test_generic_recovery.py` and `tests/test_sid_only_recovery.py`.

Run the full gate (black, pytest, pylint, pyright, coverage) with:

```bash
./run_tests.sh
```

## Where the design narrative lives

The canonical, end-to-end narrative — how the codec landed, the op-set grounding,
and the cross-driver design — lives in the sibling `preframr-xpt` repo: start at
its `AGENTS.md`, then `design/encoding/` (`sid_player_decompiler.md`,
`sid_opset_inventory.md`, `cross_driver_note_unification.md`).

## Stability

Pre-1.0 releases may break API as the codec evolves. Token-alphabet shape changes
bump the major version since they invalidate downstream checkpoints.

## License

Apache 2.0. See `LICENSE`.
