Reduce use of WTF_ALLOW_UNSAFE_BUFFER_USAGE in AudioSampleBufferConverter

[jyavenard]

4df5903

Reduce use of WTF_ALLOW_UNSAFE_BUFFER_USAGE in AudioSampleBufferConverter
https://bugs.webkit.org/show_bug.cgi?id=286345
rdar://143378500

Reviewed by Youenn Fablet.

Fly-By: Reset AudioBufferList's pointer indices within the loop to ensure
proper pointer calculations should the packet contain more than 2048 frames.

* Source/WebCore/platform/audio/cocoa/AudioSampleBufferConverter.mm:
(WebCore::AudioSampleBufferConverter::processSampleBuffers):

Canonical link: https://commits.webkit.org/289260@main

8e68cfd

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	✅ 🧪 win-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	🛠 playstation
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash cf9723f)

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
🧪 style	⏳ 🛠 ios	⏳ 🛠 mac	⏳ 🛠 wpe	⏳ 🛠 win
🧪 bindings	🛠 ios-sim	⏳ 🛠 mac-AS-debug	⏳ 🧪 wpe-wk2	⏳ 🧪 win-tests
🧪 webkitperl	🧪 ios-wk2	⏳ 🧪 api-mac	⏳ 🧪 api-wpe
	🧪 ios-wk2-wpt	⏳ 🧪 mac-wk1	🛠 wpe-cairo
⏳ 🛠 🧪 jsc	🧪 api-ios	⏳ 🧪 mac-wk2	🛠 gtk
⏳ 🛠 🧪 jsc-arm64	🛠 vision	⏳ 🧪 mac-AS-debug-wk2	🧪 gtk-wk2
	⏳ 🛠 vision-sim	⏳ 🧪 mac-wk2-stress	🧪 api-gtk
	⏳ 🧪 vision-wk2	⏳ 🧪 mac-intel-wk2	⏳ 🛠 playstation
	🛠 tv	⏳ 🛠 mac-safer-cpp	🛠 jsc-armv7
	⏳ 🛠 tv-sim		🧪 jsc-armv7-tests
	⏳ 🛠 watch
	⏳ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash cf9723f)

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	🧪 wpe-wk2	🧪 win-tests
✅ 🧪 webkitperl	🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	⏳ 🧪 api-ios	🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	🧪 mac-AS-debug-wk2	🧪 gtk-wk2
	✅ 🛠 vision-sim	❌ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🧪 vision-wk2	🧪 mac-intel-wk2	🛠 playstation
	✅ 🛠 tv	🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 691bf14)

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	✅ 🧪 win-tests
✅ 🧪 webkitperl	❌ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	⏳ 🧪 api-ios	❌ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	🧪 mac-AS-debug-wk2	🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🧪 vision-wk2	🧪 mac-intel-wk2	🛠 playstation
	✅ 🛠 tv	🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

Starting EWS tests for 691bf14. Live statuses available at the PR page, #39369

[webkit-early-warning-system]

Starting EWS tests for 8e68cfd. Live statuses available at the PR page, #39369

[webkit-early-warning-system]

EWS run on current version of this PR (hash 8e68cfd)

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	✅ 🧪 win-tests
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🛠 wpe-cairo
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2	🛠 playstation
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 289260@main (4df5903): https://commits.webkit.org/289260@main

Reviewed commits have been landed. Closing PR #39369 and removing active labels.