| export interface BrowserAudioMetadata { |
| duration: number |
| } |
|
|
| export function isSameOriginBrowserMedia(src: string, pageHref: string | undefined): boolean { |
| if (!pageHref) return false |
| try { |
| return new URL(src, pageHref).origin === new URL(pageHref).origin |
| } catch (error) { |
| console.error('[audio-utils] failed to resolve media origin:', error) |
| return false |
| } |
| } |
|
|
| export function resolveBrowserAudioPreviewGain( |
| volumeDb: number, |
| src: string, |
| pageHref: string | undefined = globalThis.location?.href, |
| ): number { |
| const safeVolumeDb = Number.isFinite(volumeDb) ? volumeDb : 0 |
| const gain = 10 ** (safeVolumeDb / 20) |
| return isSameOriginBrowserMedia(src, pageHref) ? gain : Math.min(1, gain) |
| } |
|
|
| export function loadBrowserAudioMetadata(src: string): Promise<BrowserAudioMetadata> { |
| return new Promise((resolve, reject) => { |
| const audio = new Audio() |
| const cleanup = () => { |
| audio.removeEventListener('loadedmetadata', handleLoaded) |
| audio.removeEventListener('error', handleError) |
| audio.src = '' |
| } |
| const handleLoaded = () => { |
| const duration = audio.duration |
| cleanup() |
| if (!Number.isFinite(duration) || duration <= 0) { |
| reject(new Error(`Invalid audio duration for ${src}`)) |
| return |
| } |
| resolve({ duration }) |
| } |
| const handleError = () => { |
| cleanup() |
| reject(new Error(`Unable to load audio metadata for ${src}`)) |
| } |
| audio.addEventListener('loadedmetadata', handleLoaded) |
| audio.addEventListener('error', handleError) |
| audio.preload = 'metadata' |
| audio.src = src |
| }) |
| } |
|
|
