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https://github.com/heygen-com/hyperframes.git
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Miguel Ángel
46cb5ca446
* test(player): measure heavy films in real Safari and Chrome on macOS * test(player): count runtime media seeks and rate writes during the Safari bench * test(player): compare the Safari bench against native playback of the same media * test(player): split Safari control playback into per-frame media writes and per-frame transforms * perf(core): write media volume and mute only when they change * test(player): presented frame rate and compositor-animation controls in the Safari bench * perf(core): keep the media volume guard without a new comment line * test(player): derive presented frames from playback counters and snapshot video state * test(player): control page plays only listed media, and anchor the Safari process match * test(player): send the bench as code, and write only validated numbers from the browser * fix(player): perf host page gives the player a real box, so films are on screen when measured * fix(player): a player with no height set takes its film's shape instead of collapsing to nothing The player box had no intrinsic height, so an embed that set only a width (or nothing) was 0 px tall and showed no picture. An in-flow sizer now carries the composition's aspect ratio; a height the embed sets still wins, and a height-only embed keeps its full width. * test(player): label each embed on the player box page
Hyperframe Runtime Engine
This folder owns the runtime that powers preview and producer parity.
Current Direction
- Runtime source of truth is converging on
hyperframe.ts. - Build produces:
dist/hyperframe.runtime.iife.js(browser bootstrap)dist/hyperframe.runtime.mjs(tooling/tests)dist/hyperframe.manifest.json(version + sha256 + artifact map)
- FE owns iframe runtime injection.
- BE persists raw generated HTML without injecting runtime scripts.
- Producer validates pinned runtime checksum from manifest before render.
Runtime Contract (Stable Surface)
Globals:
window.__playerwindow.__playerReadywindow.__renderReadywindow.__timelineswindow.__clipManifest
postMessage:
- parent -> runtime control:
source: "hf-parent"type: "control"- actions:
play,pause,seek,set-muted,set-playback-rate,enable-pick-mode,disable-pick-mode
- runtime -> parent events:
source: "hf-preview"type: "state"carries the wholeframe, the exactcurrentTimein seconds andended, true once the clock has reached the film's end; a parent ends the film onendedrather than comparing times, and a pause on the last frame stays a pausetype: "timeline"carriesassetsReady(whether the composition's media, images and fonts have settled) and the runtime then poststype: "assets-ready"once, so a parent that cannot read the iframe can gate playbacktype: "ready"— emitted once wheninstallRuntimeControlBridgeregisters the control-message listener. The parent uses it to replay current playback state (set-muted,set-volume,set-playback-rate) so any control message sent before the listener was installed isn't lost. Emitted again on every iframe reload because the new runtime instance starts with no state.
Determinism baseline:
renderSeekis the producer-canonical seek path.- 30fps quantization and readiness gates are correctness requirements.
- Preview automation uses
?hf-capture=1,hyperframes snapshot, or runtime readiness (window.__renderReadyand the seek contract), never a wait on all ofdocument.images. Interactive preview leaves images in hidden future clips unloaded until they are needed.
Runtime-loaded compositions finalize IDs already used by native SVG references before scene
scripts run. IDs used only by JavaScript keep their authored values. If an initial script
introduces an ID's first native url() or href reference, that ID can be renamed after
initial scripts finish. A string captured before that first native use is not guaranteed
stable; read the target element's current id after runtime readiness for deferred writes.
Attribute selectors with a declared namespace prefix (@namespace xl url(...) plus
[xl|href="#id"]) follow renamed references through the live CSSOM before scene scripts run,
in runtime and compiled output alike. Compiled CSS text leaves them as authored, so these
selectors need JavaScript; with scripts disabled they match only unrenamed values.
Build
bun run --filter @hyperframes/core build:hyperframes-runtime
Security Expectations
- Runtime bootstrap URL must be version-pinned and host-allowlisted.
- Iframe bridge payloads must be schema-validated.
- Unsafe URL schemes (
javascript:and unapproveddata:) are rejected. - Fail closed if runtime bootstrap/handshake is not healthy.
Product Editing Model
- Primary mode: prompt + element picking.
- Secondary mode: manual precision controls.
- Avoid timeline-first manual workflows as default product path.