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feat(live): add ZIP_STORED visual frame pack and unpack helpers - #7562
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Live video reaches ADK as `image/*` frames, alongside `audio/*` chunks. Saving each frame as its own artifact costs one storage operation per frame, while adding a batch method to `BaseArtifactService` would grow the abstract storage interface for every backend. This change adds `google.adk.live._visual_frames`, which packs a frame sequence into one uncompressed (`zipfile.ZIP_STORED`) `.zip` archive that the existing `save_artifact()` / `load_artifact()` methods store as is: - `VisualFrame`: a Pydantic model pairing a frame's `types.Blob` with its capture timestamp. - `pack_visual_frames()`: validates the frames (non-empty data, finite and non-decreasing timestamps), writes `frames/frame_NNNN.<ext>` members and a `metadata.json` timing manifest, and returns `(archive_bytes, manifest)`. - `unpack_visual_frames()`: the inverse; restores `(list[VisualFrame], manifest)` from the archive bytes. - `summarize_manifest()`: the manifest without its per-frame index, small enough for an artifact's `custom_metadata`. - `VISUAL_FRAMES_ZIP_MIME_TYPE`: the archive's MIME type, `application/zip`. NO_UNIT_GUIDE=Internal pack/unpack helper module for live visual frames PiperOrigin-RevId: 982888971
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feat(live): add ZIP_STORED visual frame pack and unpack helpers
Live video reaches ADK as
image/*frames, alongsideaudio/*chunks. Saving each frame as its own artifact costs one storage operation per frame, while adding a batch method toBaseArtifactServicewould grow the abstract storage interface for every backend.This change adds
google.adk.live._visual_frames, which packs a frame sequence into one uncompressed (zipfile.ZIP_STORED).ziparchive that the existingsave_artifact()/load_artifact()methods store as is:VisualFrame: a Pydantic model pairing a frame'stypes.Blobwith its capture timestamp.pack_visual_frames(): validates the frames (non-empty data, finite and non-decreasing timestamps), writesframes/frame_NNNN.<ext>members and ametadata.jsontiming manifest, and returns(archive_bytes, manifest).unpack_visual_frames(): the inverse; restores(list[VisualFrame], manifest)from the archive bytes.summarize_manifest(): the manifest without its per-frame index, small enough for an artifact'scustom_metadata.VISUAL_FRAMES_ZIP_MIME_TYPE: the archive's MIME type,application/zip.NO_UNIT_GUIDE=Internal pack/unpack helper module for live visual frames