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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>I’m currently investigating how I can modify an existing audio processing application to include the audiofirfilter plugin. The application uses gst-launch-1.0 to create pipelines. While I have a suite of IIR filters that I can implement using LADSPA, some users might want to implement FIR filters as well. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The online documentation for audiofirfilter only provides an example of how to implement it in code, however, using gst-inspect it seems that I should be able to implement it using gst-launch as well. The main issue I have encountered is how to specify the kernel. The docs say is should be of type <a href="https://gstreamer.freedesktop.org/usr/share/gtk-doc/html/gobjectgobject-Value-arrays.html#GValueArray"><span class=type><span style='color:blue'>GValueArray</span></span></a>, however, this may now be deprecated and GArray used instead – not sure. For more info, see:<o:p></o:p></p><p class=MsoNormal><a href="https://www.freedesktop.org/software/gstreamer-sdk/data/docs/2012.5/gobject/gobject-Value-arrays.html">https://www.freedesktop.org/software/gstreamer-sdk/data/docs/2012.5/gobject/gobject-Value-arrays.html</a><o:p></o:p></p><p class=MsoNormal>Can I provide an exlicit list of values for the kernel as a GArray? The number of data points used to define the kernel might range from under a thousand to over 10 thousand in some cases. Can I specify these inline as part of the gst-launch pipeline commands? Can gst-launch accept input of this length? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Just as a test I tried doing something like:<o:p></o:p></p><p class=MsoNormal>gst-launch-1.0 fakesrc ! audiofirfilter latency=3 kernel=”0 0 1 0 0” ! fakesink<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I tried various ways to specify the kernel values (comma delimited, space deliminted, real values, inside double quotes, single quotes, curly braces, etc.) and each time I received the message:<o:p></o:p></p><p class=MsoNormal>“WARNING: erroneous pipeline: could not set property “kernel” in element “audiofirfilter0” to …<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>How can I provide the kernel to audiofirfilter when using gst-launch?<o:p></o:p></p></div></body></html>