Bug 223519

Summary:	decodeAudioData chops off beginning portion of audio file
Product:	WebKit	Reporter:	Joe Hanley <joe>
Component:	Web Audio	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	ap, cdumez, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari 14
Hardware:	Mac (Intel)
OS:	macOS 10.15

Description Joe Hanley 2021-03-19 09:38:10 PDT

In Safari, decodeAudioData is returning a buffer that is missing the first ~3000 samples. For short audio files (like drum sounds for example) this can have a significant impact on the sound.

To recreate this bug, do the following in both Chrome and Safari:

Go to https://jsfiddle.net/hanley101/kbjh8sz7/17/

Load this file: https://www.dropbox.com/s/48yub3sfa2caw7x/TomLo_Ac.mp3?dl=0

Hit Decode to see the buffer length and duration. Compare between Chrome and Safari and you'll see Safari's buffer length and duration are smaller.

NOTE: The jsfiddle should also play the file when you hit decode, though this is only working in Chrome, not sure why.

Comment 1 Radar WebKit Bug Importer 2021-03-26 09:39:13 PDT

<rdar://problem/75889203>