[Webkit-unassigned] [Bug 190644] New: onaudioprocess Occasionally Has Buffers With Zeroes as Data

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=190644

            Bug ID: 190644
           Summary: onaudioprocess Occasionally Has Buffers With Zeroes as
                    Data
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Web Audio
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: stoldney.mcstoldneyson at gmail.com

I have a scriptProccessorNode that I use to capture audio off of a user's mic. I do this by getting the input buffer, like so:

audioProcessEvent.inputBuffer.getChannelData(0);

On Safari 12 on MacOS 10.13, occasionally this buffer has empty data, IE all the values in the array are 0, as if the mic has been muted. I have so far only encountered this behavior on MacOS Safari 12. It does not happen every time I run my application either, occurring about %20 of the time on my machine. However, my tester can reproduce it every time he uses the application. It occurs with every headset we have available in the office as well.

Here is a dump from the console:
> ape.inputBuffer.getChannelData(0)
< Float32Array (2048) = $1
0 0
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 0
12 0
13 0
14 0
15 0
16 0
17 0
18 0
19 0
20 0
21 0
22 0
23 0
24 0
25 0
26 0
27 0
28 0
29 0
30 0
31 0
32 0
33 0
34 0
35 0
36 0
37 0
38 0
39 0
40 0
41 0
42 0
43 0
44 0
45 0
46 0
47 0
48 0
49 0
50 0
51 0
52 0
53 0
54 0
55 0
56 0
57 0
58 0
59 0
60 0
61 0
62 0
63 0
64 0
65 0
66 0
67 0
68 0
69 0
70 0
71 0
72 0
73 0
74 0
75 0
76 0
77 0
78 0
79 0
80 0
81 0
82 0
83 0
84 0
85 0
86 0
87 0
88 0
89 0
90 0
91 0
92 0
93 0
94 0
95 0
96 0
97 0
98 0
99 0

Float32Array Prototype

Please let me know if I am doing something wrong or if you need any more info. 
Thanks.

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