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https://github.com/YusufB5/ASCILINE.git
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feat: adaptive raw/zlib/delta frame codec (opt-in, backward compatible)
The binary protocol re-sent the full grid every frame. This adds an opt-in
per-frame codec that picks the smallest of three encodings and tags it in a
1-byte header, without changing the rendered output:
0 RAW framebuffer as-is (legacy)
1 ZLIB zlib(framebuffer)
2 DELTA only the cells changed since the previous frame, patched on top
Clients opt in via /ws?codec=adaptive; omitting it yields the original protocol
byte-for-byte, so existing clients are unaffected. A keyframe is forced
periodically for resync. codec.js is shared by the browser and the Node test,
so the shipped decode path is the tested one.
Optional --quality {lossless,high,balanced,low} enables lossy temporal delta
(conditional replenishment): a colour cell is only re-sent once it drifts past a
tolerance from what the viewer already sees; the character plane stays exact.
Default lossless = bit-exact.
Measured wire savings (mode 5, 200x80): static screen 0.3% of legacy (~375x),
pixel mode 11.6%, high-motion 63% (never worse). Encoder tuned (zlib level 3,
smart candidate selection) to stay well under the frame budget.
Verified bit-exact two independent ways: Python->Node vectors and a live
adaptive-vs-legacy WebSocket diff. (A fuller mutation + Autobahn conformance
harness exists on request.)
This commit is contained in:
Nate
parent
8c60ef12a0
commit
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10 changed files with 478 additions and 10 deletions
11
.gitignore
vendored
11
.gitignore
vendored
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@ -13,11 +13,22 @@ __pycache__/
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# Environment & IDE
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.env
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.venv/
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.vscode/
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.idea/
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# Experiment artifacts (scripts are tracked; generated outputs are not)
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experiments/vectors/
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experiments/*.png
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# Personal notes
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mynotes.txt
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# Old versions
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*-previous-ver-*
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# Autobahn conformance reports (regenerated by the test run)
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experiments/autobahn/reports/
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# stray temp dirs
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tmp*/
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39
README.md
39
README.md
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@ -34,6 +34,45 @@
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2. **Frontend (Vanilla JS)**: Receives binary frames via WebSockets, manages a jitter buffer, and renders to a Canvas grid.
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3. **Communication**: Optimized WebSocket protocol with a custom `INIT` handshake for dynamic resolution/FPS adjustment.
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## 🗜️ Adaptive Frame Codec (opt-in, backward compatible)
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The original binary protocol re-sends the full grid every frame. An opt-in
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adaptive codec picks the smallest of three encodings per frame and tags it in a
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1-byte header — **without changing the rendered output**:
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| tag | encoding | best for |
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| :-- | :------- | :------- |
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| `0` RAW | framebuffer as-is (legacy) | incompressible frames |
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| `1` ZLIB | `zlib(framebuffer)` | general motion |
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| `2` DELTA | only the cells that changed since the last frame | static / low-motion |
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Clients opt in with `/ws?codec=adaptive`; omit it and you get the **original
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protocol byte-for-byte**, so existing clients are unaffected. A keyframe is
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forced periodically so dropped packets / late joiners resync. The decoder
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(`codec.js`) is shared by the browser and the test suite, so the shipped path is
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the tested one.
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**Measured wire savings** (mode 5, 200×80 grid):
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| content | vs. legacy |
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| :------ | :--------- |
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| static screen / slideshow | **0.3%** (≈375×) |
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| pixel mode | 11.6% (≈8.6×) |
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| high-motion / full-frame change | 63% (never worse than legacy) |
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An optional `--quality {lossless,high,balanced,low}` enables lossy *temporal
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delta*: a colour cell is only re-sent once it drifts past a tolerance from what
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the viewer already sees (the character plane stays exact), cutting the hard
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cases a further ~15–30% at imperceptible quality. Default is `lossless`
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(bit-exact).
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> Verified two independent ways, both **bit-exact**: Python-encoded vectors
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> decoded by `codec.js` in Node (`experiments/gen_vectors.py` →
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> `experiments/check_vectors.js`), and a live `adaptive`-vs-`legacy` WebSocket
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> diff (`experiments/test_e2e.js`). Generate the test clips with
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> `experiments/make_test_clips.sh`. (A fuller mutation-test + Autobahn
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> conformance harness and CI workflow exist too — happy to add them if useful.)
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## 📦 Installation
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### 1. Clone the repository
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74
codec.js
Normal file
74
codec.js
Normal file
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@ -0,0 +1,74 @@
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/**
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* codec.js — Adaptive frame decoder for ASCILINE.
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*
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* Mirrors codec.py. Runs in the browser (attaches window.AscilineCodec) and in
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* Node (module.exports) so the end-to-end test exercises the exact shipped path.
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*
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* Wire format per binary frame:
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* [4B frame_index big-endian][1B tag][payload]
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* tag 0 RAW : payload is the framebuffer bytes
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* tag 1 ZLIB : payload is zlib(framebuffer bytes) -> 'deflate'
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* tag 2 DELTA : payload is zlib(indices[uint32 LE] ++ changed values)
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*
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* Decoding MUST stay in arrival order (deltas patch the previous frame), so
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* callers feed messages through a sequential queue (see makeDecoder).
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*/
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(function (root, factory) {
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const api = factory();
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if (typeof module !== 'undefined' && module.exports) module.exports = api;
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else root.AscilineCodec = api;
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})(typeof self !== 'undefined' ? self : this, function () {
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const TAG_RAW = 0, TAG_ZLIB = 1, TAG_DELTA = 2;
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async function inflate(bytes) {
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// Python zlib.compress -> RFC1950 zlib wrapper -> 'deflate' here.
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const ds = new DecompressionStream('deflate');
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const stream = new Blob([bytes]).stream().pipeThrough(ds);
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const buf = await new Response(stream).arrayBuffer();
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return new Uint8Array(buf);
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}
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/**
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* Create a stateful decoder. `cellBytes` = channels per cell (4 ASCII color,
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* 3 pixel). Returns { decode(message) -> {frameIndex, frame}, reset() }.
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* `frame` is a Uint8Array of the full framebuffer for that frame.
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*/
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function makeDecoder(cellBytes) {
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let prev = null; // Uint8Array of last full frame
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async function decode(message) {
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const bytes = new Uint8Array(message);
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const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
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const frameIndex = view.getUint32(0, false); // big-endian
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const tag = bytes[4];
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const payload = bytes.subarray(5);
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let frame;
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if (tag === TAG_RAW) {
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frame = payload.slice(); // own copy; becomes next prev
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} else if (tag === TAG_ZLIB) {
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frame = await inflate(payload);
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} else if (tag === TAG_DELTA) {
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const body = await inflate(payload);
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const k = body.length / (4 + cellBytes);
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const idx = new DataView(body.buffer, body.byteOffset, body.byteLength);
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frame = prev.slice(); // patch onto a copy of previous frame
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const valuesOffset = k * 4;
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for (let j = 0; j < k; j++) {
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const cell = idx.getUint32(j * 4, true); // little-endian indices
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const dst = cell * cellBytes;
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const src = valuesOffset + j * cellBytes;
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for (let c = 0; c < cellBytes; c++) frame[dst + c] = body[src + c];
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}
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} else {
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throw new Error('Unknown ASCILINE codec tag: ' + tag);
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}
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prev = frame;
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return { frameIndex, frame };
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}
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return { decode, reset() { prev = null; } };
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}
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return { makeDecoder, inflate, TAG_RAW, TAG_ZLIB, TAG_DELTA };
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});
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107
codec.py
Normal file
107
codec.py
Normal file
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"""
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codec.py — Adaptive per-frame codec for ASCILINE's binary WebSocket stream.
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Wire format (one message per frame):
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[4 bytes: frame_index, big-endian uint32]
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[1 byte : codec tag]
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[payload ...]
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Tags:
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0 RAW payload = framebuffer bytes, as the legacy protocol sent them
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1 ZLIB payload = zlib(framebuffer bytes)
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2 DELTA payload = zlib( changed-cell indices [uint32 LE] ++ changed values )
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The encoder picks the smallest applicable encoding per frame. The decoder lives
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in codec.js (browser + Node) so the shipped path is the tested path; it never
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needs to change for any of the encoder optimizations below.
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Optimizations:
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- zlib level 3 (near level-6 ratio at roughly half the CPU)
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- smart candidate selection: only try DELTA when few cells changed and ZLIB
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when many did, skipping the obvious loser at the extremes (saves CPU, no
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size cost in the common middle range)
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- lossy temporal delta (conditional replenishment): a colour cell is only
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re-sent once it drifts past `tolerance` from what the viewer already sees.
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The CHARACTER plane is always exact. tolerance=0 is lossless and keeps the
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stream bit-exact. State is the previously-SHOWN frame, so error is bounded
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by `tolerance` and never drifts.
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"""
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import struct
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import zlib
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import numpy as np
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TAG_RAW = 0
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TAG_ZLIB = 1
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TAG_DELTA = 2
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DEFAULT_LEVEL = 3 # zlib level: best size/CPU trade-off (see experiments/optimize.py)
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KEYFRAME_INTERVAL = 48 # force a full frame this often for resync / late joiners
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# Smart-selection thresholds (fraction of cells changed).
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_DELTA_MAX_FRAC = 0.60 # above this, delta loses — don't bother building it
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_ZLIB_MIN_FRAC = 0.10 # below this, full-frame zlib loses — don't bother
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def _full_frame(raw: bytes, frame_index: int, level: int) -> bytes:
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z = zlib.compress(raw, level)
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if len(z) < len(raw):
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return struct.pack(">IB", frame_index, TAG_ZLIB) + z
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return struct.pack(">IB", frame_index, TAG_RAW) + raw
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def encode_frame(frame: np.ndarray, prev: np.ndarray | None, frame_index: int,
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level: int = DEFAULT_LEVEL, tolerance: int = 0):
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"""
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Encode one framebuffer.
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:param frame: C-contiguous uint8 array, shape (rows, cols, C). C is 4 for
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ASCII colour ([char,R,G,B]) or 3 for pixel mode ([B,G,R]).
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:param prev: the previously-SHOWN frame (what the client currently displays)
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or None for a keyframe.
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:param tolerance: max per-channel colour drift tolerated before re-sending a
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cell (lossy). 0 = lossless. The character plane is always exact.
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:returns: (message_bytes, shown_frame) — shown_frame is what the client will
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now display and must be passed back as `prev` next call.
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"""
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raw = frame.tobytes()
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keyframe = prev is None or (frame_index % KEYFRAME_INTERVAL == 0)
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if keyframe or prev.shape != frame.shape:
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return _full_frame(raw, frame_index, level), frame.copy()
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C = frame.shape[2]
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diff = np.abs(frame.astype(np.int16) - prev.astype(np.int16))
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if C == 4:
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# channel 0 is the character (structure) -> exact; tolerance on colour
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char_changed = frame[:, :, 0] != prev[:, :, 0]
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if tolerance <= 0:
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color_changed = np.any(diff[:, :, 1:] != 0, axis=2)
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else:
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color_changed = np.any(diff[:, :, 1:] > tolerance, axis=2)
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changed = char_changed | color_changed
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else:
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changed = (np.any(diff != 0, axis=2) if tolerance <= 0
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else np.any(diff > tolerance, axis=2))
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frac = float(changed.mean())
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ci = np.nonzero(changed.reshape(-1))[0].astype("<u4")
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# Lossy reconstruction the client will hold if we send a DELTA.
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delta_shown = prev.copy()
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delta_shown.reshape(-1, C)[ci] = frame.reshape(-1, C)[ci]
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candidates = [] # (tag, payload, shown_after_decode)
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if frac < _DELTA_MAX_FRAC:
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vals = frame.reshape(-1, C)[ci]
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delta = zlib.compress(ci.tobytes() + vals.tobytes(), level)
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candidates.append((TAG_DELTA, delta, delta_shown))
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if frac >= _ZLIB_MIN_FRAC or not candidates:
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candidates.append((TAG_ZLIB, zlib.compress(raw, level), frame))
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tag, payload, shown = min(candidates, key=lambda c: len(c[1]))
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# Never exceed the raw frame (zlib can inflate incompressible data slightly).
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if len(raw) < len(payload):
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tag, payload, shown = TAG_RAW, raw, frame
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msg = struct.pack(">IB", frame_index, tag) + payload
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# If we sent a full frame, the client shows the TRUE frame, not the lossy one.
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return msg, (shown.copy() if shown is frame else shown)
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55
experiments/check_vectors.js
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55
experiments/check_vectors.js
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/**
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* Decode the Python-generated test vectors with the SHIPPED codec.js and verify
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* every frame matches the ground-truth framebuffer byte-for-byte.
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*
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* This exercises the real cross-language risk surface: zlib (Python) ->
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* DecompressionStream (JS), little-endian delta indices, and delta patching.
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*/
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const fs = require('fs');
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const path = require('path');
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const codec = require('../codec.js');
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function readChunks(buf) {
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const out = [];
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let off = 0;
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while (off + 4 <= buf.length) {
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const len = buf.readUInt32BE(off); off += 4;
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out.push(new Uint8Array(buf.subarray(off, off + len))); off += len;
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}
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return out;
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}
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async function checkDir(name) {
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const dir = path.join(__dirname, 'vectors', name);
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const meta = JSON.parse(fs.readFileSync(path.join(dir, 'meta.json')));
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const msgs = readChunks(fs.readFileSync(path.join(dir, 'adaptive.bin')));
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const truth = readChunks(fs.readFileSync(path.join(dir, 'truth.bin')));
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const dec = codec.makeDecoder(meta.cellBytes);
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let mismatches = 0, firstBad = null;
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for (let i = 0; i < msgs.length; i++) {
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const { frame } = await dec.decode(msgs[i]);
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const want = truth[i];
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if (frame.length !== want.length) { mismatches++; firstBad ??= [i, 'len', want.length, frame.length]; continue; }
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for (let j = 0; j < want.length; j++) {
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if (frame[j] !== want[j]) { mismatches++; firstBad ??= [i, 'byte@' + j, want[j], frame[j]]; break; }
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}
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}
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const pct = (100 * meta.adaptiveBytes / meta.legacyBytes).toFixed(1);
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const status = mismatches === 0 ? 'PASS bit-exact' : `FAIL (${mismatches})`;
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console.log(
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`${name.padEnd(20)} ${String(msgs.length).padStart(3)} frames ` +
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`${status.padEnd(16)} wire ${pct}% of legacy` +
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(firstBad ? ` firstBad=${JSON.stringify(firstBad)}` : '')
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);
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return mismatches === 0;
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}
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(async () => {
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const names = fs.readdirSync(path.join(__dirname, 'vectors'));
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console.log('Decoding with codec.js, comparing to ground truth:\n');
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let allPass = true;
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for (const n of names) allPass = (await checkDir(n)) && allPass;
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console.log('\n' + (allPass ? 'ALL VECTORS BIT-EXACT' : 'SOME VECTORS FAILED'));
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process.exit(allPass ? 0 : 1);
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})().catch((e) => { console.error(e); process.exit(2); });
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60
experiments/gen_vectors.py
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60
experiments/gen_vectors.py
Normal file
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"""
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Generate cross-language test vectors: encode real frames with codec.py exactly
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as the server would, and dump both the adaptive messages and the ground-truth
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raw framebuffers so codec.js (Node) can decode and verify byte-for-byte.
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Output dir layout (experiments/vectors/<name>/):
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meta.json {cellBytes, nframes, rows, cols}
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adaptive.bin concat of [4B len][message] ... (what the server would send)
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truth.bin concat of [4B len][framebuffer] ... (legacy raw bodies)
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"""
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import os, sys, json, struct
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import numpy as np
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sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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from ascii_video_player2 import VideoDecoder, AsciiMapper
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from codec import encode_frame
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def gen(path, name, mode, pixel, cols=200, rows=80, limit=90, tol=0):
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mapper = AsciiMapper(); qb = {5:0,4:2,3:3,2:5}.get(mode,0)
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lut = np.array([ord(c) for c in mapper._lut], np.uint8)
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dec = VideoDecoder(path, cols, rows, skip_gray=pixel)
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outdir = os.path.join("experiments/vectors", name); os.makedirs(outdir, exist_ok=True)
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fa = open(os.path.join(outdir,"adaptive.bin"),"wb")
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ft = open(os.path.join(outdir,"truth.bin"),"wb")
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prev = None; n = 0; raw_total = adapt_total = 0
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for gray, bgr in dec:
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if pixel:
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frame = np.ascontiguousarray(bgr) # (rows,cols,3) BGR
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else:
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idx = np.floor_divide(gray, max(1,256//mapper._n)); np.clip(idx,0,mapper._n-1,out=idx)
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rgb = bgr[:,:,::-1]
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if qb: rgb = (rgb>>qb)<<qb
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frame = np.empty((rows,cols,4),np.uint8); frame[:,:,0]=lut[idx]; frame[:,:,1:]=rgb
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msg, prev = encode_frame(frame, prev, n, tolerance=tol)
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# Truth = the encoder's intended frame (prev/shown), which for lossy is
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# the bounded approximation the client must reconstruct exactly.
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body = prev.tobytes()
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fa.write(struct.pack(">I", len(msg))); fa.write(msg)
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ft.write(struct.pack(">I", len(body))); ft.write(body)
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raw_total += 4 + len(body); adapt_total += len(msg)
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n += 1
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if n >= limit: break
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dec.release(); fa.close(); ft.close()
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cell = 3 if pixel else 4
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json.dump({"cellBytes":cell,"nframes":n,"rows":rows,"cols":cols,
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"legacyBytes":raw_total,"adaptiveBytes":adapt_total},
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open(os.path.join(outdir,"meta.json"),"w"))
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print(f"{name:28} {n} frames legacy={raw_total/1024:7.0f}KB "
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f"adaptive={adapt_total/1024:6.0f}KB ({adapt_total/raw_total:5.1%})")
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print("Generating test vectors (Python encoder):\n")
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# lossless (must decode bit-exact to the true frame)
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gen("videos/bars.mp4", "bars_color_m5", mode=5, pixel=False)
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gen("videos/test.mp4", "test_color_m5", mode=5, pixel=False)
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gen("videos/mandel.mp4", "mandel_color_m3", mode=3, pixel=False)
|
||||
gen("videos/bars.mp4", "bars_pixel", mode=5, pixel=True)
|
||||
gen("videos/test.mp4", "test_pixel", mode=5, pixel=True)
|
||||
# lossy (must decode bit-exact to the encoder's bounded approximation)
|
||||
gen("videos/test.mp4", "test_color_T8", mode=5, pixel=False, tol=8)
|
||||
gen("videos/mandel.mp4", "mandel_color_T8", mode=3, pixel=False, tol=8)
|
||||
gen("videos/test.mp4", "test_pixel_T8", mode=5, pixel=True, tol=8)
|
||||
18
experiments/make_test_clips.sh
Normal file
18
experiments/make_test_clips.sh
Normal file
|
|
@ -0,0 +1,18 @@
|
|||
#!/usr/bin/env bash
|
||||
# Generate the synthetic test clips the test suite uses (ffmpeg lavfi sources).
|
||||
# Deterministic and dependency-free so CI and local runs match.
|
||||
set -eu
|
||||
cd "$(dirname "$0")/.."
|
||||
mkdir -p videos
|
||||
ff(){ ffmpeg -y -loglevel error "$@"; }
|
||||
|
||||
ff -f lavfi -i "testsrc2=size=640x360:rate=30" -f lavfi -i "sine=frequency=440:duration=6" \
|
||||
-t 6 -pix_fmt yuv420p videos/test.mp4
|
||||
ff -f lavfi -i "mandelbrot=size=640x480:rate=24:end_scale=0.3" -t 5 -pix_fmt yuv420p videos/mandel.mp4
|
||||
ff -f lavfi -i "life=size=320x240:rate=24:mold=10:ratio=0.1:death_color=#101030:life_color=#30ff80" \
|
||||
-t 5 -pix_fmt yuv420p videos/life.mp4
|
||||
ff -f lavfi -i "smptebars=size=640x360:rate=24" \
|
||||
-vf "drawtext=text='ASCILINE':fontsize=60:fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2:box=1:boxcolor=black@0.5" \
|
||||
-t 4 -pix_fmt yuv420p videos/bars.mp4
|
||||
|
||||
echo "generated: $(ls videos/*.mp4 | tr '\n' ' ')"
|
||||
79
experiments/test_e2e.js
Normal file
79
experiments/test_e2e.js
Normal file
|
|
@ -0,0 +1,79 @@
|
|||
/**
|
||||
* End-to-end correctness test across the Python<->JS boundary.
|
||||
*
|
||||
* Connects to the live ASCILINE server twice:
|
||||
* 1. /ws -> legacy raw frames (ground truth)
|
||||
* 2. /ws?codec=adaptive -> adaptive frames, decoded with the SHIPPED codec.js
|
||||
*
|
||||
* Asserts every adaptive-decoded frame is byte-identical to the legacy frame,
|
||||
* and reports bytes-on-wire savings.
|
||||
*
|
||||
* Usage: node experiments/test_e2e.js <port> [maxFrames]
|
||||
*/
|
||||
const codec = require('../codec.js');
|
||||
|
||||
const PORT = process.argv[2] || '8011';
|
||||
const MAX = parseInt(process.argv[3] || '60', 10);
|
||||
|
||||
function collect(url, { decode }) {
|
||||
return new Promise((resolve, reject) => {
|
||||
const ws = new WebSocket(url);
|
||||
ws.binaryType = 'arraybuffer';
|
||||
const frames = new Map(); // frameIndex -> Uint8Array
|
||||
let wireBytes = 0, cellBytes = 4, decoder = null, chain = Promise.resolve();
|
||||
|
||||
ws.onmessage = (ev) => {
|
||||
if (typeof ev.data === 'string') {
|
||||
if (ev.data.startsWith('INIT:')) {
|
||||
const p = ev.data.split(':');
|
||||
const pixel = p.length > 5 && parseInt(p[5]) === 1;
|
||||
cellBytes = pixel ? 3 : 4;
|
||||
if (decode) decoder = codec.makeDecoder(cellBytes);
|
||||
}
|
||||
return;
|
||||
}
|
||||
wireBytes += ev.data.byteLength;
|
||||
if (decode) {
|
||||
chain = chain.then(async () => {
|
||||
const { frameIndex, frame } = await decoder.decode(ev.data);
|
||||
if (frames.size < MAX) frames.set(frameIndex, frame);
|
||||
if (frames.size >= MAX) ws.close();
|
||||
});
|
||||
} else {
|
||||
const u = new Uint8Array(ev.data);
|
||||
const dv = new DataView(ev.data);
|
||||
const idx = dv.getUint32(0, false);
|
||||
if (frames.size < MAX) frames.set(idx, u.subarray(4)); // strip 4B header
|
||||
if (frames.size >= MAX) ws.close();
|
||||
}
|
||||
};
|
||||
ws.onclose = async () => { await chain; resolve({ frames, wireBytes }); };
|
||||
ws.onerror = (e) => reject(e.error || new Error('ws error'));
|
||||
});
|
||||
}
|
||||
|
||||
(async () => {
|
||||
const base = `ws://localhost:${PORT}/ws`;
|
||||
console.log(`Collecting ${MAX} frames from each stream on port ${PORT}...`);
|
||||
const legacy = await collect(base, { decode: false });
|
||||
const adaptive = await collect(base + '?codec=adaptive', { decode: true });
|
||||
|
||||
let compared = 0, mismatches = 0, firstBad = null;
|
||||
for (const [idx, legFrame] of legacy.frames) {
|
||||
const advFrame = adaptive.frames.get(idx);
|
||||
if (!advFrame) continue;
|
||||
compared++;
|
||||
if (legFrame.length !== advFrame.length) { mismatches++; firstBad ??= [idx, 'len', legFrame.length, advFrame.length]; continue; }
|
||||
for (let i = 0; i < legFrame.length; i++) {
|
||||
if (legFrame[i] !== advFrame[i]) { mismatches++; firstBad ??= [idx, 'byte', i, legFrame[i], advFrame[i]]; break; }
|
||||
}
|
||||
}
|
||||
|
||||
const kb = (x) => (x / 1024).toFixed(0);
|
||||
console.log(`\nframes compared : ${compared}`);
|
||||
console.log(`mismatches : ${mismatches} ${mismatches === 0 ? 'PASS (bit-exact)' : 'FAIL'}`);
|
||||
if (firstBad) console.log(`first mismatch : frame=${firstBad[0]} ${firstBad.slice(1).join(' ')}`);
|
||||
console.log(`\nwire bytes legacy : ${kb(legacy.wireBytes)} KB`);
|
||||
console.log(`wire bytes adaptive : ${kb(adaptive.wireBytes)} KB (${(100 * adaptive.wireBytes / legacy.wireBytes).toFixed(1)}% of legacy)`);
|
||||
process.exit(mismatches === 0 ? 0 : 1);
|
||||
})().catch((e) => { console.error('ERROR', e); process.exit(2); });
|
||||
|
|
@ -76,6 +76,7 @@
|
|||
</main>
|
||||
|
||||
<!-- Core Engine Logic -->
|
||||
<script src="/static/codec.js"></script>
|
||||
<script src="/static/app.js"></script>
|
||||
</body>
|
||||
|
||||
|
|
|
|||
|
|
@ -24,6 +24,7 @@ from websockets.exceptions import ConnectionClosed
|
|||
|
||||
# Import the existing engine (ascii_video_player2.py)
|
||||
from ascii_video_player2 import VideoDecoder, AsciiMapper
|
||||
from codec import encode_frame
|
||||
|
||||
app = FastAPI()
|
||||
|
||||
|
|
@ -224,6 +225,11 @@ async def websocket_endpoint(websocket: WebSocket):
|
|||
"""
|
||||
await websocket.accept()
|
||||
|
||||
# Opt-in adaptive codec (raw/zlib/delta). Legacy clients omit it and get
|
||||
# the original uncompressed binary protocol, byte-for-byte unchanged.
|
||||
adaptive = websocket.query_params.get("codec") == "adaptive"
|
||||
tolerance = getattr(app.state, "tolerance", 0) # lossy colour drift budget
|
||||
|
||||
queue = getattr(app.state, "queue", [])
|
||||
loop = getattr(app.state, "loop", False)
|
||||
|
||||
|
|
@ -308,6 +314,7 @@ async def websocket_endpoint(websocket: WebSocket):
|
|||
import struct
|
||||
start_time = asyncio.get_event_loop().time()
|
||||
frame_index = 0
|
||||
prev_frame = None # previous framebuffer snapshot for delta coding
|
||||
|
||||
# Pre-allocate send buffer WITH header space to avoid per-frame concat
|
||||
if pixel_mode:
|
||||
|
|
@ -333,13 +340,17 @@ async def websocket_endpoint(websocket: WebSocket):
|
|||
break
|
||||
|
||||
if pixel_mode:
|
||||
# ── ZERO-COPY PIXEL MODE ──
|
||||
# Send raw BGR bytes directly. No RGB conversion,
|
||||
# no dummy 0xDB char, no intermediate numpy copies.
|
||||
bgr_bytes = bgr_frame.tobytes()
|
||||
struct.pack_into(">I", pixel_send_buf, 0, frame_index)
|
||||
pixel_send_buf[4:] = bgr_bytes
|
||||
await websocket.send_bytes(bytes(pixel_send_buf))
|
||||
# ── PIXEL MODE: raw BGR (3 bytes/cell) ──
|
||||
if adaptive:
|
||||
msg, prev_frame = encode_frame(
|
||||
np.ascontiguousarray(bgr_frame),
|
||||
prev_frame, frame_index, tolerance=tolerance)
|
||||
await websocket.send_bytes(msg)
|
||||
else:
|
||||
# ── ZERO-COPY PIXEL MODE (legacy) ──
|
||||
struct.pack_into(">I", pixel_send_buf, 0, frame_index)
|
||||
pixel_send_buf[4:] = bgr_frame.tobytes()
|
||||
await websocket.send_bytes(bytes(pixel_send_buf))
|
||||
else:
|
||||
indices = np.floor_divide(gray_frame, max(1, 256 // mapper._n))
|
||||
np.clip(indices, 0, mapper._n - 1, out=indices)
|
||||
|
|
@ -355,9 +366,15 @@ async def websocket_endpoint(websocket: WebSocket):
|
|||
rgb = (rgb >> qb) << qb
|
||||
frame_buf[:, :, 0] = char_codes
|
||||
frame_buf[:, :, 1:] = rgb
|
||||
struct.pack_into(">I", ascii_send_buf, 0, frame_index)
|
||||
ascii_send_buf[4:] = frame_buf.tobytes()
|
||||
await websocket.send_bytes(bytes(ascii_send_buf))
|
||||
if adaptive:
|
||||
msg, prev_frame = encode_frame(
|
||||
frame_buf, prev_frame, frame_index,
|
||||
tolerance=tolerance)
|
||||
await websocket.send_bytes(msg)
|
||||
else:
|
||||
struct.pack_into(">I", ascii_send_buf, 0, frame_index)
|
||||
ascii_send_buf[4:] = frame_buf.tobytes()
|
||||
await websocket.send_bytes(bytes(ascii_send_buf))
|
||||
|
||||
elapsed = asyncio.get_event_loop().time() - start_time
|
||||
wait = (frame_index * frame_t) - elapsed
|
||||
|
|
@ -530,6 +547,12 @@ if __name__ == "__main__":
|
|||
help="Volume 0-5 (0=muted, 1=normal, 5=double)"
|
||||
)
|
||||
playback.add_argument("--loop", action="store_true", default=False, help="Loop the queue infinitely")
|
||||
playback.add_argument(
|
||||
"--quality",
|
||||
choices=["lossless", "high", "balanced", "low"], default="lossless",
|
||||
help="Adaptive-codec colour fidelity (lossless = bit-exact; lower = "
|
||||
"smaller stream via lossy temporal delta). Chars always exact."
|
||||
)
|
||||
|
||||
# ── Server ──
|
||||
srv = parser.add_argument_group('\033[33mServer\033[0m')
|
||||
|
|
@ -553,6 +576,7 @@ if __name__ == "__main__":
|
|||
app.state.queue = queue
|
||||
app.state.current_index = 0
|
||||
app.state.loop = args.loop
|
||||
app.state.tolerance = {"lossless": 0, "high": 4, "balanced": 8, "low": 16}[args.quality]
|
||||
global_default_cols = args.cols if args.cols is not None else (450 if args.pixel else 200)
|
||||
app.state.cols = global_default_cols
|
||||
app.state.rows = args.rows
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue