Unerstanding Capsfilter test 'test_unfixed_downstream_caps' from gst/tests/check

[Krzysztof Konopko]

Hi,

fakesrc element can provide ANY capabilities, the sink pad expects the
following capibilities:

#define CAPS_TEMPLATE_STRING            \
    "audio/x-raw, "                     \
    "channels = (int) [ 1, 2], "        \
    "rate = (int) [ 1,  MAX ]"

while only two of them are provided by the capsfilter:

"audio/x-raw, rate=(int)44100"

The resulting capabilities are unfixed/not
negotiated/unconstrained/ambiguous.

The purpose of this test is to make sure that the pipeline will fail to
play in such situation.

Kris

On 03/12/12 07:23, deepthips wrote:
> Hi I couldnt fully understand the test test_unfixed_downstream_caps from
> tests/check/elements/capsfilter.c.  From the code flow, I couldnt get a
> picture of the test done.
> 
> If some one could help, it would be really helpful.
> 
> 
> GST_START_TEST (test_unfixed_downstream_caps)
> {
>   GstElement *pipe, *src, *filter;
>   GstCaps *filter_caps;
>   GstPad *mysinkpad;
>   GstMessage *msg;
> 
>   pipe = gst_check_setup_element ("pipeline");
> 
>   src = gst_check_setup_element ("fakesrc");
>   g_object_set (src, "sizetype", 2, "sizemax", 1024, "num-buffers", 1,
> NULL);
> 
>   filter = gst_check_setup_element ("capsfilter");
>   filter_caps = gst_caps_from_string ("audio/x-raw-int, rate=(int)44100");
>   fail_unless (filter_caps != NULL);
>   g_object_set (filter, "caps", filter_caps, NULL);
> 
>   gst_bin_add_many (GST_BIN (pipe), src, filter, NULL);
>   fail_unless (gst_element_link (src, filter));
> 
>   mysinkpad = gst_check_setup_sink_pad (filter, &sinktemplate, NULL);
>   gst_pad_set_active (mysinkpad, TRUE);
> 
>   fail_unless_equals_int (gst_element_set_state (pipe, GST_STATE_PLAYING),
>       GST_STATE_CHANGE_SUCCESS);
> 
>   /* wait for error on bus */
>   msg = gst_bus_poll (GST_ELEMENT_BUS (pipe),
>       GST_MESSAGE_EOS | GST_MESSAGE_ERROR, -1);
> 
>   fail_if (GST_MESSAGE_TYPE (msg) != GST_MESSAGE_ERROR,
>       "Expected ERROR message, got EOS message");
>   gst_message_unref (msg);
> 
>   /* We don't expect any output buffers unless the check fails */
>   fail_unless (buffers == NULL);
> 
>   /* cleanup */
>   GST_DEBUG ("cleanup");
> 
>   gst_pad_set_active (mysinkpad, FALSE);
>   gst_check_teardown_sink_pad (filter);
>   gst_check_teardown_element (pipe);
>   gst_caps_unref (filter_caps);
> }
> 
> 
> 
> 
> --
> View this message in context: http://gstreamer-devel.966125.n4.nabble.com/Unerstanding-Capsfilter-test-test-unfixed-downstream-caps-from-gst-tests-check-tp4657172.html
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