302521 2025-11-14 01:12:38 -0800 REGRESSION (Safari 26): AudioData.copyTo() crashes the tab with valid conversion 2025-12-18 22:06:23 -0800 1 1 1 Unclassified WebKit Media Safari Technology Preview Mac (Apple Silicon) macOS 26 RESOLVED FIXED InRadar P2 Normal --- 1 hi webkit-unassigned jean-yves.avenard jer.noble webkit-bug-importer oldest_to_newest 2158746 0 hi 2025-11-14 01:12:38 -0800 The following snippet crashes the tab, as of Safari Technology Preview 231, seems like code has not changed since. ``` const data = new AudioData({ numberOfChannels: 3, data: new Float32Array([1, 1, 1]), format: 'f32', numberOfFrames: 1, sampleRate: 48000, timestamp: 0, }); const dataBytes = new Float32Array(1); data.copyTo(dataBytes, {planeIndex: 2, format: 'f32-planar'}); console.log(dataBytes); ``` It's a `pac violation` according to Console.app. What is happening here? We have interleaved audio with 3 channels. We would like to turn this into planar audio (spec says: "Conversion to f32-planar MUST always be supported"). The correct behavior would be to take every third element of the input array and copy that into the destination buffer. Chrome correctly performs the conversion and returns `Float32Array([1])`. 2158820 1 ap 2025-11-14 09:34:53 -0800 This hits: RELEASE_ASSERT(sourcePlane.size() >= sampleIndexIncrement * samples + sampleOffset - 1); 2158821 2 webkit-bug-importer 2025-11-14 09:34:58 -0800 <rdar://problem/164730320> 2158822 3 477397 ap 2025-11-14 09:35:18 -0800 Created attachment 477397 test case Same test as an attachment. 2164345 4 nipun_shukla 2025-12-08 23:13:45 -0800 Pull request: https://github.com/WebKit/WebKit/pull/55085 2167195 5 ews-feeder 2025-12-18 22:06:21 -0800 Committed 304728@main (3fe28c6ca996): <https://commits.webkit.org/304728@main> Reviewed commits have been landed. Closing PR #55085 and removing active labels. 477397 2025-11-14 09:35:18 -0800 2025-11-14 09:35:18 -0800 test case 302521.html text/html 307 ap PHNjcmlwdD4KY29uc3QgZGF0YSA9IG5ldyBBdWRpb0RhdGEoewoJbnVtYmVyT2ZDaGFubmVsczog MywKCWRhdGE6IG5ldyBGbG9hdDMyQXJyYXkoWzEsIDEsIDFdKSwKCWZvcm1hdDogJ2YzMicsCglu dW1iZXJPZkZyYW1lczogMSwKCXNhbXBsZVJhdGU6IDQ4MDAwLAoJdGltZXN0YW1wOiAwLAp9KTsK CmNvbnN0IGRhdGFCeXRlcyA9IG5ldyBGbG9hdDMyQXJyYXkoMSk7CmRhdGEuY29weVRvKGRhdGFC eXRlcywge3BsYW5lSW5kZXg6IDIsIGZvcm1hdDogJ2YzMi1wbGFuYXInfSk7CmNvbnNvbGUubG9n KGRhdGFCeXRlcyk7Cjwvc2NyaXB0Pg==