how to get the final caps of gstplaybin (or gstdecodebin)?
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how to get the final caps of gstplaybin (or gstdecodebin)?
 
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In gstplaybin.c, after the
dynamic pipeline has created, I try to get the final src pad (caps) of
gstplaybin (gstdecodebin), but failed in function: gen_video_element(); I recursively parse the
element in gstplaybin, but gst_caps_get_structure() will report error that “gst_caps_get_structure:
assertion `GST_IS_CAPS (caps)' failed”. The error msg and my
source code is as following, thanks for your help ################error
message: ====element name
-2:mpeg2dec0 file:
gstplaybin.c, func: gen_video_element, line: 920 file:
gstplaybin.c, func: gen_video_element, line: 926 it is not a bin file:
gstplaybin.c, func: gen_video_element, line: 935 (gst-launch-0.10:14448):
GStreamer-CRITICAL **: gst_caps_get_structure: assertion `GST_IS_CAPS (caps)'
failed ===Error, we can't find
the src structure of play_bin, wuwu~~~ ====element name -2:fakesink ===Error, we can't find
the src pad of play_bin, wuwu~~~ ====element name
-2:typefind file:
gstplaybin.c, func: gen_video_element, line: 920 file:
gstplaybin.c, func: gen_video_element, line: 926 it is not a bin file:
gstplaybin.c, func: gen_video_element, line: 935 ################my src
codec iter =
gst_bin_iterate_elements (GST_BIN_CAST(play_bin)); while
(!done) {
switch (gst_iterator_next (iter, &data)) {
case GST_ITERATOR_OK:
{
child = GST_ELEMENT_CAST (data);
temp_name = gst_element_get_name (child);
if(!strncmp(temp_name, "decodebin",9))
{
GstIterator *iter_2 = NULL;
gboolean done_2 = FALSE;
gpointer data_2 = NULL;
GstElement *child_2=NULL;
gboolean res_2 = TRUE;
gchar *temp_name_2 = NULL;
iter_2 = gst_bin_iterate_elements (GST_BIN_CAST(child));
while (!done_2) {
switch (gst_iterator_next (iter_2, &data_2)) {
case GST_ITERATOR_OK:
{
child_2 = GST_ELEMENT_CAST (data_2);
temp_name_2 = gst_element_get_name (child_2);
PRINTF("====element name -2:%s\n",temp_name_2);
g_free (temp_name_2);
if ((play_bin_src_pad = gst_element_get_pad (child_2, "src")) ==
NULL) {
PRINTF("===Error, we can't find the src pad of play_bin, wuwu~~~\n");
break;
}
PRINT_MARK;
if (play_bin_src_caps = gst_pad_get_caps (play_bin_src_pad) == NULL) {
PRINTF("===Error, we can't find the src caps of play_bin,
wuwu~~~\n");
break;
}
PRINT_MARK;
if (GST_IS_BIN(child_2)) {
PRINTF("it is a bin\n"); }
else
{
PRINTF("it is not a bin\n");
}
PRINT_MARK; if
((structure = gst_caps_get_structure (play_bin_src_caps, 0)) == NULL) {
PRINTF("===Error, we can't find the src structure of play_bin,
wuwu~~~\n");
break;
}
PRINT_MARK;
structure_name = gst_structure_get_name(structure);
PRINTF("==== structure_name: %s====\n",structure_name);
gst_object_unref (structure);
gst_object_unref (structure_name);
gst_object_unref (child_2);
}
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (iter_2);
res_2 = TRUE;
break;
case GST_ITERATOR_DONE:
done_2 = TRUE;
break;
case GST_ITERATOR_ERROR:
g_assert_not_reached ();
break;
}
}
gst_iterator_free (iter_2);
}
g_free (temp_name);
// gst_object_unref (child);
}
break;
case GST_ITERATOR_RESYNC:
gst_iterator_resync (iter);
res = TRUE;
break;
case GST_ITERATOR_DONE:
done = TRUE;
break;
case GST_ITERATOR_ERROR:
g_assert_not_reached ();
break;
} }
gst_iterator_free (iter); ZHAO,
Halley (Aihua) Email: halley.zhao[hidden email] Tel: +86(21)61166476 iNet: 8821-6476 SSG/OTC/UMD 3W033 ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
gen_video_element.c (12K)
Re: how to get the final caps of gstplaybin (or gstdecodebin)?
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Re: how to get the final caps of gstplaybin (or gstdecodebin)?
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Re: how to get the final caps of gstplaybin (or gstdecodebin)?
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