Testing audiomixer with GstHarness

[Olivier Crête]

Hi,

The audiomixer element has a thread, so you want to wait for it to do it's thing, you can use gst_harness_pull_until_eos() to wait for a buffer or EOS event to be received instead of gst_harness_buffers_received() which doesn't wait.

Olivier


 ---- On Fri, 18 Oct 2024 03:43:01 -0400  Maxim Dzhura via gstreamer-devel  wrote --- 
 > Hi all,
 > 
 > I am trying to write a unit test for audiomixer using GstHarness. It
 > always fails, but succeeds when replace audiomixer for identity
 > element. I am using gstreamer 1.22.6, C++ and gtest. Here is the code:
 > 
 > struct GstHarnessDeleter
 > {
 >     void operator()( GstHarness* h )
 >     {
 >         gst_harness_teardown( h );
 >     }
 > };
 > 
 > using GstHarnessUPtr = std::unique_ptr;
 > 
 > TEST( audiomixer, run )
 > {
 >     GstHarnessUPtr h( gst_harness_new_with_padnames( "audiomixer",
 > "sink_0", "src" ) );
 >     //GstHarnessUPtr h( gst_harness_new( "identity" ) ); <- passes
 > 
 >     gst_harness_add_src_parse( h.get(), "audiotestsrc is-live=true", TRUE );
 > 
 >     gst_harness_set_src_caps_str( h.get(),
 > "audio/x-raw,format=S32LE,rate=44100,channels=2,layout=interleaved" );
 > 
 >     ASSERT_EQ( GST_FLOW_OK, gst_harness_src_crank_and_push_many(
 > h.get(), 1, 1) );
 >     ASSERT_EQ( 1, gst_harness_buffers_received( h.get() ) );
 > }
 > 
 > The failure is
 > Expected equality of these values:
 >   1
 >   gst_harness_buffers_received( h.get() )
 >     Which is: 0
 > 
 > 
 > I checked buffers arriver to audiomixer sink pad with GST_SCHEDULE,
 > and audiomixer goes into PLAYING state. As well I check
 > audioaggregator and GST_PADS logs for extra sink pads, so I don't
 > think audiomixer is waiting for data.
 > 
 > I run out of ideas why it doesn't work.
 > 
 > Regards,
 > Maxim
 > 
 > -- 
 > Maxim Dzhura
 > 
-- 
Olivier Crête
Multimedia Lead
olivier.crete at collabora.com