feat(ai): Add Live video recording helper

[dlarocque]

Adds a startVideoRecording helper function which captures media input from either the user's camera or screen and sends it to the Live model using sendVideoRealtime.

This makes it easy for developers to add video recording functionality, without having to make considerations for things like base64-encoding, using browser APIs, and breaking up the video input to 1 FPS frames.

Draft- missing API approval and tests.

[changeset-bot]

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Latest commit: c7f67b7

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[github-actions]

Vertex AI Mock Responses Check ⚠️

A newer major version of the mock responses for Vertex AI unit tests is available. update_vertexai_responses.sh should be updated to clone the latest version of the responses: v15.0

[google-oss-bot]

Size Report ¹

Affected Products

• @firebase/ai

  Type	Base (217cc4c)	Merge (4c92e79)	Diff
  browser	64.0 kB	66.8 kB	+2.73 kB (+4.3%)
  main	67.8 kB	70.6 kB	+2.83 kB (+4.2%)
  module	64.0 kB	66.8 kB	+2.73 kB (+4.3%)

• firebase

  Type	Base (217cc4c)	Merge (4c92e79)	Diff
  firebase-ai.js	50.6 kB	52.8 kB	+2.22 kB (+4.4%)

Test Logs

• Base (217cc4c): https://github.com/firebase/firebase-js-sdk/actions/runs/18595654762
• Merge (4c92e79): https://github.com/firebase/firebase-js-sdk/actions/runs/18597731361

1. https://storage.googleapis.com/firebase-sdk-metric-reports/fFMxsSkmPP.html

[google-oss-bot]

Size Analysis Report ¹

Affected Products

• @firebase/ai

  • LiveGenerativeModel

    Size

    Type	Base (217cc4c)	Merge (4c92e79)	Diff
    size	13.5 kB	13.5 kB	+28 B (+0.2%)
    size-with-ext-deps	31.2 kB	31.2 kB	+28 B (+0.1%)

  • LiveSession

    Size

    Type	Base (217cc4c)	Merge (4c92e79)	Diff
    size	9.93 kB	9.96 kB	+28 B (+0.3%)
    size-with-ext-deps	27.5 kB	27.6 kB	+28 B (+0.1%)

  • getLiveGenerativeModel

    Size

    Type	Base (217cc4c)	Merge (4c92e79)	Diff
    size	16.0 kB	16.0 kB	+28 B (+0.2%)
    size-with-ext-deps	33.7 kB	33.7 kB	+28 B (+0.1%)

  • startAudioConversation

    Size

    Type	Base (217cc4c)	Merge (4c92e79)	Diff
    size	12.7 kB	12.7 kB	+75 B (+0.6%)
    size-with-ext-deps	30.5 kB	30.6 kB	+75 B (+0.2%)

  • startVideoRecording

    Size

    Type	Base (217cc4c)	Merge (4c92e79)	Diff
    size	?	8.68 kB	? (?)
    size-with-ext-deps	?	26.3 kB	? (?)

    Dependency

    Type	Base (217cc4c)	Merge (4c92e79)	Diff
    functions	?	chromeAdapterFactory decodeInstanceIdentifier factory registerAI startVideoRecording	?
    classes	?	AIError AIService Backend ChromeAdapterImpl GoogleAIBackend VertexAIBackend VideoRecordingRunner	?
    variables	?	11 dependencies AIErrorCode AI_TYPE Availability BackendType DEFAULT_LOCATION InferenceMode Task VIDEO_FRAME_RATE logger name version	?
    enums	?		?

    External Dependency

    Module	Base (217cc4c)	Merge (4c92e79)	Diff
    @firebase/app	?	_registerComponent registerVersion	?
    @firebase/component	?	Component	?
    @firebase/logger	?	Logger	?
    @firebase/util	?	FirebaseError	?

Test Logs

• Base (217cc4c): https://github.com/firebase/firebase-js-sdk/actions/runs/18595654762
• Merge (4c92e79): https://github.com/firebase/firebase-js-sdk/actions/runs/18597731361

1. https://storage.googleapis.com/firebase-sdk-metric-reports/C8Iqusjew2.html