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tests: fix test-effect-switch

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Make it into an example of how to dynamically change an element
in a playing pipeline using pad blocking.
This commit is contained in:
Wim Taymans 2012-10-05 10:59:30 +02:00
parent cdb22274e6
commit 7b6d465586
1 changed files with 66 additions and 64 deletions
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130
tests/icles/test-effect-switch.c
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@ -28,8 +28,9 @@
static gchar *opt_effects = NULL;
#define DEFAULT_EFFECTS "identity,exclusion,navigationtest," \
"agingtv,videoflip,vertigotv,gaussianblur,identity"
"agingtv,videoflip,vertigotv,gaussianblur,shagadelictv,edgetv"
static GstPad *blockpad;
static GstElement *conv_before;
static GstElement *conv_after;
static GstElement *cur_effect;
@ -37,86 +38,80 @@ static GstElement *pipeline;
static GQueue effects = G_QUEUE_INIT;
#if 0
static GstPadProbeReturn
pad_probe_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstElement *next = user_data;
GST_ERROR_OBJECT (pad, "pad is idle now");
gst_element_set_state (cur_effect, GST_STATE_NULL);
/* remove unlinks automatically */
GST_ERROR_OBJECT (pipeline, "removing %" GST_PTR_FORMAT, cur_effect);
gst_bin_remove (GST_BIN (pipeline), cur_effect);
GST_ERROR_OBJECT (pipeline, "adding %" GST_PTR_FORMAT, next);
gst_bin_add (GST_BIN (pipeline), next);
GST_ERROR_OBJECT (pipeline, "linking..");
gst_element_link_many (conv_before, next, conv_after, NULL);
gst_element_set_state (next, GST_STATE_PLAYING);
cur_effect = next;
/* FIXME: this seems to not work */
gst_pad_remove_probe (pad, info->id);
g_print ("Done\n");
/* FIXME: returning PROBE_REMOVE from an idle probe seems to do nothing */
return GST_PAD_PROBE_REMOVE;
}
#endif
static gboolean
timeout_cb (gpointer user_data)
event_probe_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GMainLoop *loop = user_data;
GstElement *next;
gulong block_id;
GstPad *pad;
if (GST_EVENT_TYPE (GST_PAD_PROBE_INFO_DATA (info)) != GST_EVENT_EOS)
return GST_PAD_PROBE_OK;
gst_pad_remove_probe (pad, GST_PAD_PROBE_INFO_ID (info));
/* push current event back into the queue */
g_queue_push_tail (&effects, gst_object_ref (cur_effect));
/* take next effect from the queue */
next = g_queue_pop_head (&effects);
if (next == NULL) {
GST_DEBUG_OBJECT (pad, "no more effects");
g_main_loop_quit (loop);
return FALSE;
return GST_PAD_PROBE_DROP;
}
g_print ("Switching from '%s' to '%s'..\n", GST_OBJECT_NAME (cur_effect),
GST_OBJECT_NAME (next));
pad = gst_element_get_static_pad (conv_before, "src");
block_id =
gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_BLOCK, NULL, NULL, NULL);
g_print ("Blocked\n");
gst_pad_remove_probe (pad, block_id);
gst_element_set_state (cur_effect, GST_STATE_NULL);
/* remove unlinks automatically */
GST_DEBUG_OBJECT (pipeline, "removing %" GST_PTR_FORMAT, cur_effect);
gst_bin_remove (GST_BIN (pipeline), cur_effect);
g_print ("Removed\n");
gst_bin_add (GST_BIN (pipeline), next);
g_print ("Added\n");
gst_element_link_many (conv_before, next, conv_after, NULL);
g_print ("Re-linked\n");
gst_element_set_state (next, GST_STATE_PLAYING);
cur_effect = next;
gst_element_set_state (pipeline, GST_STATE_PLAYING);
/* FIXME: we have to remove the block before we link, otherwise the
* caps queries on linking will deadlock us - check if that's intentional */
#if 0
gst_pad_remove_probe (pad, block_id);
#endif
g_print ("Done\n\n\n");
/* FIXME: waiting for the pad to be idle, and then relinking from there
* doesn't seem to work very well either for some reason, and returning
* GST_PAD_PROBE_REMOVE does not seem to work. Doing the same from a
* BLOCKING callback has the same problem as above */
#if 0
gst_pad_add_probe (pad, GST_PAD_PROBE_TYPE_IDLE, pad_probe_cb, next, NULL);
#endif
GST_DEBUG_OBJECT (pipeline, "adding %" GST_PTR_FORMAT, next);
gst_bin_add (GST_BIN (pipeline), next);
GST_DEBUG_OBJECT (pipeline, "linking..");
gst_element_link_many (conv_before, next, conv_after, NULL);
gst_element_set_state (next, GST_STATE_PLAYING);
cur_effect = next;
GST_DEBUG_OBJECT (pipeline, "done");
return GST_PAD_PROBE_DROP;
}
static GstPadProbeReturn
pad_probe_cb (GstPad * pad, GstPadProbeInfo * info, gpointer user_data)
{
GstPad *srcpad, *sinkpad;
GST_DEBUG_OBJECT (pad, "pad is blocked now");
/* remove the probe first */
gst_pad_remove_probe (pad, GST_PAD_PROBE_INFO_ID (info));
/* install new probe for EOS */
srcpad = gst_element_get_static_pad (cur_effect, "src");
gst_pad_add_probe (srcpad, GST_PAD_PROBE_TYPE_BLOCK |
GST_PAD_PROBE_TYPE_EVENT_DOWNSTREAM, event_probe_cb, user_data, NULL);
gst_object_unref (srcpad);
/* push EOS into the element, the probe will be fired when the
* EOS leaves the effect and it has thus drained all of its data */
sinkpad = gst_element_get_static_pad (cur_effect, "sink");
gst_pad_send_event (sinkpad, gst_event_new_eos ());
gst_object_unref (sinkpad);
return GST_PAD_PROBE_OK;
}
static gboolean
timeout_cb (gpointer user_data)
{
gst_pad_add_probe (blockpad, GST_PAD_PROBE_TYPE_BLOCK_DOWNSTREAM,
pad_probe_cb, user_data, NULL);
return TRUE;
}
@ -175,8 +170,13 @@ main (int argc, char **argv)
effect_names = g_strsplit (DEFAULT_EFFECTS, ",", -1);
for (e = effect_names; e != NULL && *e != NULL; ++e) {
g_print ("Adding effect '%s'\n", *e);
g_queue_push_tail (&effects, gst_element_factory_make (*e, NULL));
GstElement *el;
el = gst_element_factory_make (*e, NULL);
if (el) {
g_print ("Adding effect '%s'\n", *e);
g_queue_push_tail (&effects, el);
}
}
pipeline = gst_pipeline_new ("pipeline");
@ -192,6 +192,8 @@ main (int argc, char **argv)
q1 = gst_element_factory_make ("queue", NULL);
blockpad = gst_element_get_static_pad (q1, "src");
conv_before = gst_element_factory_make ("videoconvert", NULL);
effect = g_queue_pop_head (&effects);