[Bug 794257] New: audiomixer: Negotiation failure when input has several channels (> 2)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=794257

            Bug ID: 794257
           Summary: audiomixer: Negotiation failure when input has several
                    channels (> 2)
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: blocker
          Priority: Normal
         Component: gst-plugins-base
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: tsaunier at gnome.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Basically for some reason the channel-mask seems to be ignmore and then
gst_audio_info_set_format fails.

Very simple reproduction steps:

```
$ GST_DEBUG=2 gst-launch-1.0 audiotestsrc !
audio/x-raw,channels=6,channel-mask="(bitmask)0x0000000000000c0f",format=F32LE,rate=48000,layout=interleaved
! audiomixer ! fakesink              

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
0:00:00.026757068 23500 0x55dd57827ca0 WARN              aggregator
gstaggregator.c:1715:gst_aggregator_query_latency_unlocked:<audiomixer0>
Latency query failed
0:00:00.026856769 23500 0x55dd57827ca0 WARN              aggregator
gstaggregator.c:1715:gst_aggregator_query_latency_unlocked:<audiomixer0>
Latency query failed
0:00:00.027209799 23500 0x55dd57827ca0 ERROR             audio-info
audio-info.c:304:gst_audio_info_from_caps: no channel-mask property given
0:00:00.027219079 23500 0x55dd57827ca0 WARN         audioaggregator
gstaudioaggregator.c:841:gst_audio_aggregator_negotiated_src_caps:<audiomixer0>
Rejecting invalid caps: audio/x-raw, format=(string)F32LE, rate=(int)48000,
channels=(int)6, layout=(string)interleaved
0:00:00.027236206 23500 0x55dd57827ca0 WARN              aggregator
gstaggregator.c:1061:gst_aggregator_update_src_caps:<audiomixer0> Subclass
failed to accept negotiated caps
0:00:00.027381273 23500 0x55dd57827c50 WARN                 basesrc
gstbasesrc.c:3055:gst_base_src_loop:<audiotestsrc0> error: Internal data stream
error.
0:00:00.027392720 23500 0x55dd57827c50 WARN                 basesrc
gstbasesrc.c:3055:gst_base_src_loop:<audiotestsrc0> error: streaming stopped,
reason not-negotiated (-4)
ERROR: from element /GstPipeline:pipeline0/GstAudioTestSrc:audiotestsrc0:
Internal data stream error.
Additional debug info:
../subprojects/gstreamer/libs/gst/base/gstbasesrc.c(3055): gst_base_src_loop
(): /GstPipeline:pipeline0/GstAudioTestSrc:audiotestsrc0:
streaming stopped, reason not-negotiated (-4)
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
```

Marking as blocker as it works on 1.12.

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