936347 - [Media Recording] the Result of Recording 1K tone from audiocontext sounds broken

Status: RESOLVED WORKSFORME

(Core :: Audio/Video: Recording, defect)

Description

[Randy Lin [:rlin] - Be Mozillian on 2015/01/26]

Attachment: Orgaudio.raw

STR: 
1. Navigate people.mozilla.com/~rlin2. press GetAudioContext
2. Press getAudioContext
3. Start (recording)
4. playback from memory
the result sounds broken. Also happen on 400hz tone.
Recording audio from GetAudioTag2ch sounds well.
I found the resampler produces some click sounds as audio.raw(48000hz, 2ch, float)
But the Orgaudio.raw can't found it.(44100hz, 2ch, float)

Comment 1

[Randy Lin [:rlin] - Be Mozillian on 2015/01/26]

Attachment: audio.raw

Comment 2

[Randy Lin [:rlin] - Be Mozillian on 2015/01/26]

Hi derf, 
Any ideas for this one?

Comment 3

[Randy Lin [:rlin] - Be Mozillian on 2015/01/26]

Test on changeset: 155018:d58ab6f6ca0a, 
I can't found this problem.

Comment 4

[Ralph Giles (:rillian)]

I can reproduce this with Nightly 28.0a1 (2013-11-20) on MacOS 10.8.5.

Comment 5

[Ralph Giles (:rillian)]

Attachment: bug936347.opus

We added blob export to rlin's test page; here's an example. You can see what look like periodic phase jumps in the sine wave.

Comment 6

[Ralph Giles (:rillian)]

My clicks are much worse than in Randy's audio.raw above, but his testing suggests the problem is in the code calling the resampler. Randy can reproduce on Windows Nightly as well, but not on Linux, which is weird since that code should be platform-idependent.

Comment 7

[Randy Lin [:rlin] - Be Mozillian on 2015/01/26]

I just have a try and can't find this problem on 2014/6/16 nightly build.