[Bug 759890] New: audioconvert: creates choppy audio

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759890

            Bug ID: 759890
           Summary: audioconvert: creates choppy audio
    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: ensonic at sonicpulse.de
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 317911
  --> https://bugzilla.gnome.org/attachment.cgi?id=317911&action=edit
bisect notes

With the new code powering audioconvert I get choppy audio in buzztrax. It
looks like as if the 1/4 part of a buffer is good and the next 3/4 are filled
with low bit noise (see attached wav). I am testing at gst-plugin-base
(69d3b098a2c2eed02af6916d8798995a139f5de9). I've tried to bisect it, but the
problem is that since audioconvert was touched by

e3f0f3b91ef8468187a65632aa9cc2b4aa4bb5a1 is the first bad commit
commit e3f0f3b91ef8468187a65632aa9cc2b4aa4bb5a1
Author: Wim Taymans <wtaymans at redhat.com>
Date:   Fri Nov 6 17:49:00 2015 +0100

    audio-converter: move audio converter to audio libs

    Move the audio-converter helper to the audio library.

Starting from that commit running my app results in no playback at all, but:
** (buzztrax-edit:2095): CRITICAL **: gst_audio_converter_samples: assertion
'out_produced != NULL' failed
0:00:13.907141581  2239 0x7fcaec032800 WARN            audioconvert
gstaudioconvert.c:768:gst_audio_convert_transform:<freeverb
00_master:audioconvert> error: error while converting
** (buzztrax-edit:2095): CRITICAL **: gst_audio_converter_samples: assertion
'out_produced != NULL' failed
0:00:13.917307830  2239 0x7fcaec032a30 WARN            audioconvert
gstaudioconvert.c:768:gst_audio_convert_transform:<bass_FSM-PanzerDelay:audioconvert>
error: error while converting


Later (ff6d1a2a25b247688f38e117782a6b43d525706a) something changed and instead
I get one of 3 different crashes (see the log).

Again later (8bcf183c7ffcc8aa887ce9e6b4f36c44037bbf89) that was fixed, but now
I have the choppy audio. The audio issue might have been there from the start
of the changes though.

I don't have a simple launch pipeline as a repro yet. The audio format in
buzztrax is F32, mono/stereo interleaved.

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