1530178 - [Web Audio API] copyFromChannel/copyToChannel error occurs

Status: RESOLVED FIXED

(Core :: Web Audio, defect, P3)

Description

[gaito]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0

Steps to reproduce:

Call [WebAudioAPI] AudioBuffer.copyFromChannel() or AudioBuffer.copyToChannel(), with the end of the copy exceeds the size of the AudioBuffer.

const audiobuf = actx.createBuffer(1, 100, actx.sampleRate);
const buf = new Float32Array(50);
audiobuf.copyFromChannel(buf, 0, 90); // should copy from 90 to 140
audiobuf.copyToChannel(buf, 0, 90);

SampleCode is Here : https://www.g200kg.com/demo/test/copyfrom.html

Actual results:

"IndexSizeError: Index or size is negative or greater than the allowed amount"
error occurs. It is different from specification.

Expected results:

If the beginning of the copy is within the size of the AudioBuffer, no error occurs and copying until the end of the AudioBuffer should be executed.

https://webaudio.github.io/web-audio-api/#dom-audiobuffer-copyfromchannel

"1.4.3. Methods

copyFromChannel(destination, channelNumber, startInChannel)

Then the number of frames copied from buffer to destination is min(Nb-k,Nf). If this is less than Nf, then the remaining elements of destination are not modified."

Comment 1

[Karl Tomlinson (:karlt)]

https://github.com/WebAudio/web-audio-api/issues/1004

Comment 2

[Valentin MILLET]

Attachment: Bug 1530178 - copyFromChannel/copyToChannel until end of buffer when destination/source is longer r?padenot

Comment 3

[Valentin MILLET]

Attachment: Bug 1530178 - Update WPT expectations. r?padenot

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

There are some r+ patches which didn't land and no activity in this bug for 2 weeks.
:valentin.millet39, could you have a look please?

Comment 5

[Paul Adenot (:padenot)]

I'm going to pick this one up, this was part of a school project that is now done.

Comment 6

[Paul Adenot (:padenot)]

Attachment: Bug 1530178 - Fix audiobuffer-copy-channel.html to allow copyFromChannel/copyToChannel wth an offset of n on an array that is n elements long. r?karlt

This is a no-op, but is allowed per spec:

An optional offset to copy the data to. If startInChannel is greater than the
length of the AudioBuffer, an IndexSizeError MUST be thrown.

If the numbers are equals, this shouldn't throw.

Comment 7

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/fe9afae0f868
copyFromChannel/copyToChannel until end of buffer when destination/source is longer r=padenot,karlt
https://hg.mozilla.org/integration/autoland/rev/1c983b486cd0
Fix audiobuffer-copy-channel.html to allow copyFromChannel/copyToChannel wth an offset of n on an array that is n elements long.  r=karlt
https://hg.mozilla.org/integration/autoland/rev/bfebd4300498
Update WPT expectations. r=padenot

Comment 8

[Cristian Brindusan [:cbrindusan]]

https://hg.mozilla.org/mozilla-central/rev/fe9afae0f868
https://hg.mozilla.org/mozilla-central/rev/1c983b486cd0
https://hg.mozilla.org/mozilla-central/rev/bfebd4300498

Comment 9

[Web Platform Test Sync Bot (Matrix: #interop:mozilla.org)]

Created web-platform-tests PR https://github.com/web-platform-tests/wpt/pull/16708 for changes under testing/web-platform/tests