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Web Audio API: decoding AudioBuffers from fetch, CORS requirements for ArrayBuffer responses, and worklets
`decodeAudioData` needs untainted input—fetch cross-origin audio with appropriate `crossOrigin` and CORS headers.
1 min read
web-audiocorsbrowser
Streaming
MediaElementSource connects to `<audio>`—CORS on media URLs still applies for cross-origin media.
HLS in MSE uses separate segment requests—each host needs CORS if not same-origin.
Latency
Large decode buffers increase time-to-first-sound—separate from CORS but often conflated in bug reports.