[Bug 771871] New: lv2 plugin doesn't do processing in case of mono sound

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=771871

            Bug ID: 771871
           Summary: lv2 plugin doesn't do processing in case of mono sound
    Classification: Platform
           Product: GStreamer
           Version: 1.9.2
                OS: All
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: samamonov at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Hi

I have a scenario with processing mono audio with lv2 plugin. It doesn't not
work.

Most likely the root of the problem is in ext/lv2/stlv2filter.c function
gst_lv2_filter_transform_data:

the allocated array (in) to be processed in lv2 is filled with input data only
in case of number of lv2 input ports more than 1 (most likely should be MORE OR
EQUALS 1). In case when lv2_group->ports->len == 1 the array "in" is not
initialized with data from the in_map but passed to the function
lilv_instance_connect_port.

Definitely the same situation happens with storing of processed data form the 
out array to the out_map

Thanks
Sergey

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