[Bug 777915] audiomixer, audioaggregator: division by zero in _fill_buffer

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777915

Tim-Philipp Müller <t.i.m at zen.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |t.i.m at zen.co.uk
          Component|don't know                  |gst-plugins-bad
            Summary|rate negotiation sometimes  |audiomixer,
                   |fails                       |audioaggregator: division
                   |                            |by zero in _fill_buffer

--- Comment #8 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
Thanks for the bug report.

adder is not going to get fixed, it's effectively deprecated.

As Olivier said, there's a conceptual issue here that needs to be worked around
by setting caps or by implementing conversions as per bug #773762.

I'll hijack this bug for a floating-point-division-by-zero bug that the initial
pipeline exposes when substituting adder for audiomixer:

Thread 2 "mix:src" received signal SIGFPE, Arithmetic exception.
[Switching to Thread 0x7ffff473c700 (LWP 27253)]
0x00007ffff4742edd in gst_audio_aggregator_fill_buffer (inbuf=0x7fffe40056a0,
pad=0x55555597be30 [GstAudioMixerPad], aagg=0x555555972be0 [GstAudioMixer]) at
gstaudioaggregator.c:785
785      pad->priv->size = gst_buffer_get_size (inbuf) / bpf;
(gdb) bt
#0  0x00007ffff4742edd in gst_audio_aggregator_fill_buffer
(inbuf=0x7fffe40056a0, pad=0x55555597be30 [GstAudioMixerPad],
aagg=0x555555972be0 [GstAudioMixer]) at gstaudioaggregator.c:785
#1  0x00007ffff4742edd in gst_audio_aggregator_aggregate (agg=0x555555972be0
[GstAudioMixer], timeout=0) at gstaudioaggregator.c:1249
#2  0x00007ffff495ad87 in gst_aggregator_aggregate_func (self=0x555555972be0
[GstAudioMixer]) at gstaggregator.c:1121

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