isValidAudioBase64 (rpc-contract/speech-params.ts)

Validates base64 audio strings and defines speech parameter constants for dictation services.

// Source: https://github.com/stablyai/orca | License: MIT | Copyright 2026 Lovecast Inc
// Provided via justclaw.it.com; keep this notice with the code.
import { z } from 'zod'
import { OptionalString, requiredString } from './rpc-param-primitives'

export const AUDIO_BASE64_PATTERN = /^[A-Za-z0-9+/]*={0,2}$/

export const DICTATION_SAMPLE_RATE = 16_000

export const PCM_BYTES_PER_SAMPLE = 2

export const MAX_DICTATION_AUDIO_SECONDS = 5

export const MAX_DICTATION_AUDIO_CHUNK_BYTES =
  DICTATION_SAMPLE_RATE * PCM_BYTES_PER_SAMPLE * MAX_DICTATION_AUDIO_SECONDS

export const MAX_DICTATION_AUDIO_CHUNK_BASE64_LENGTH =
  Math.ceil(MAX_DICTATION_AUDIO_CHUNK_BYTES / 3) * 4

export function isValidAudioBase64(value: string): boolean {
  return value.length % 4 !== 1 && AUDIO_BASE64_PATTERN.test(v

... (truncated -- full source via MCP)