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decodebin3: Reset parsebin when new caps arrive

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Check if parsebin can handle the new caps, and if not reset it so that it can
reconfigure itself for the new stream format.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1900>
This commit is contained in:
Edward Hervey 2022-01-21 16:23:38 +01:00 committed by Edward Hervey
parent c658e29d09
commit 4a436b5c14
1 changed files with 68 additions and 0 deletions
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68
subprojects/gst-plugins-base/gst/playback/gstdecodebin3.c
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@ -976,6 +976,70 @@ free_input_async (GstDecodebin3 * dbin, DecodebinInput * input)
(GstElementCallAsyncFunc) free_input, input, NULL);
}
static gboolean
sink_query_function (GstPad * sinkpad, GstDecodebin3 * dbin, GstQuery * query)
{
DecodebinInput *input =
g_object_get_data (G_OBJECT (sinkpad), "decodebin.input");
g_return_val_if_fail (input, FALSE);
GST_DEBUG_OBJECT (sinkpad, "query %" GST_PTR_FORMAT, query);
/* We accept any caps, since we will reconfigure ourself internally if the new
* stream is incompatible */
if (GST_QUERY_TYPE (query) == GST_QUERY_ACCEPT_CAPS) {
GST_DEBUG_OBJECT (dbin, "Accepting ACCEPT_CAPS query");
gst_query_set_accept_caps_result (query, TRUE);
return TRUE;
}
return gst_pad_query_default (sinkpad, GST_OBJECT (dbin), query);
}
static gboolean
sink_event_function (GstPad * sinkpad, GstDecodebin3 * dbin, GstEvent * event)
{
DecodebinInput *input =
g_object_get_data (G_OBJECT (sinkpad), "decodebin.input");
g_return_val_if_fail (input, FALSE);
GST_DEBUG_OBJECT (sinkpad, "event %" GST_PTR_FORMAT, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GST_DEBUG_OBJECT (sinkpad,
"New caps, checking if they are compatible with existing parsebin");
if (input->parsebin_sink) {
GstCaps *newcaps = NULL;
gst_event_parse_caps (event, &newcaps);
GST_DEBUG_OBJECT (sinkpad, "new caps %" GST_PTR_FORMAT, newcaps);
if (newcaps
&& !gst_pad_query_accept_caps (input->parsebin_sink, newcaps)) {
GST_DEBUG_OBJECT (sinkpad,
"Parsebin doesn't accept the new caps %" GST_PTR_FORMAT, newcaps);
GST_STATE_LOCK (dbin);
/* Reset parsebin so that it reconfigures itself for the new stream format */
gst_element_set_state (input->parsebin, GST_STATE_NULL);
gst_element_sync_state_with_parent (input->parsebin);
GST_STATE_UNLOCK (dbin);
} else {
GST_DEBUG_OBJECT (sinkpad, "Parsebin accepts new caps");
}
}
break;
}
default:
break;
}
/* Chain to parent function */
return gst_pad_event_default (sinkpad, GST_OBJECT (dbin), event);
}
/* Call with INPUT_LOCK taken */
static DecodebinInput *
create_new_input (GstDecodebin3 * dbin, gboolean main)
@ -994,6 +1058,10 @@ create_new_input (GstDecodebin3 * dbin, gboolean main)
g_free (pad_name);
}
g_object_set_data (G_OBJECT (input->ghost_sink), "decodebin.input", input);
gst_pad_set_event_function (input->ghost_sink,
(GstPadEventFunction) sink_event_function);
gst_pad_set_query_function (input->ghost_sink,
(GstPadQueryFunction) sink_query_function);
gst_pad_set_link_function (input->ghost_sink, gst_decodebin3_input_pad_link);
gst_pad_set_unlink_function (input->ghost_sink,
gst_decodebin3_input_pad_unlink);