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camerabin-example: cleanups for mainloop and state-changes. Fixes #608042

Browse source 
Start camerabin via idle handler to have the mainloop already running. Avoid
some unnecessary state changes. Cleanup the bus usage when restarting.
This commit is contained in:
Stefan Kost 2010-01-28 15:00:32 +02:00
parent b0533bfdff
commit 0713748e1b
1 changed files with 52 additions and 24 deletions
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76
tests/examples/camerabin/gst-camera.c
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@ -130,6 +130,8 @@ static gchar *image_post;
static GList *video_caps_list = NULL;
static guint bus_handler_id = 0;
#ifdef HAVE_GST_PHOTO_IFACE_H
static gchar *iso_speed_labels[] = { "auto", "100", "200", "400" };
@ -314,11 +316,17 @@ my_bus_callback (GstBus * bus, GstMessage * message, gpointer data)
gst_message_parse_state_changed (message, &old, &new, &pending);
GST_DEBUG_OBJECT (GST_MESSAGE_SRC (message), "state-change %s -> %s",
gst_element_state_get_name (old), gst_element_state_get_name (new));
/* Create/destroy color controls according videosrc state */
if (GST_MESSAGE_SRC (message) == GST_OBJECT (gst_videosrc)) {
if (old == GST_STATE_PAUSED && new == GST_STATE_READY) {
GST_INFO_OBJECT (GST_MESSAGE_SRC (message), "state-change %s -> %s",
gst_element_state_get_name (old), gst_element_state_get_name (new));
if (old == GST_STATE_READY && new == GST_STATE_NULL) {
destroy_color_controls ();
} else if (old == GST_STATE_READY && new == GST_STATE_PAUSED) {
} else if (old == GST_STATE_NULL && new == GST_STATE_READY) {
create_color_controls ();
}
}
@ -334,8 +342,8 @@ my_bus_callback (GstBus * bus, GstMessage * message, gpointer data)
GST_DEBUG_GRAPH_SHOW_NON_DEFAULT_PARAMS, dump_name);
g_free (dump_name);
}
}
break;
}
case GST_MESSAGE_ELEMENT:
{
handle_element_message (message);
@ -502,7 +510,6 @@ me_gst_setup_pipeline_create_vid_post_bin (const gchar * videopost)
static gboolean
me_gst_setup_pipeline (const gchar * imagepost, const gchar * videopost)
{
GstMessage *msg;
GstBus *bus;
GstCaps *preview_caps;
@ -521,7 +528,7 @@ me_gst_setup_pipeline (const gchar * imagepost, const gchar * videopost)
preview_caps = gst_caps_from_string (PREVIEW_CAPS);
bus = gst_pipeline_get_bus (GST_PIPELINE (gst_camera_bin));
gst_bus_add_watch (bus, my_bus_callback, NULL);
bus_handler_id = gst_bus_add_watch (bus, my_bus_callback, NULL);
gst_bus_set_sync_handler (bus, my_bus_sync_callback, NULL);
gst_object_unref (bus);
@ -570,17 +577,6 @@ me_gst_setup_pipeline (const gchar * imagepost, const gchar * videopost)
gst_element_set_state (gst_camera_bin, GST_STATE_PLAYING);
msg = gst_bus_timed_pop_filtered (GST_ELEMENT_BUS (gst_camera_bin),
3 * GST_SECOND, GST_MESSAGE_ERROR | GST_MESSAGE_ASYNC_DONE);
if (GST_MESSAGE_TYPE (msg) == GST_MESSAGE_ERROR) {
print_error_message (msg);
gst_message_unref (msg);
goto done;
}
gst_message_unref (msg);
#ifdef HAVE_GST_PHOTO_IFACE_H
/* Initialize menus to default settings */
GtkWidget *sub_menu =
@ -600,11 +596,28 @@ done:
return FALSE;
}
static gboolean
me_gst_setup_default_pipeline (gpointer data)
{
if (!me_gst_setup_pipeline (NULL, NULL)) {
gtk_main_quit ();
}
return FALSE;
}
static void
me_gst_cleanup_element ()
{
if (gst_camera_bin) {
GstBus *bus;
gst_element_set_state (gst_camera_bin, GST_STATE_NULL);
gst_element_get_state (gst_camera_bin, NULL, NULL, GST_CLOCK_TIME_NONE);
bus = gst_pipeline_get_bus (GST_PIPELINE (gst_camera_bin));
gst_bus_set_sync_handler (bus, NULL, NULL);
g_source_remove (bus_handler_id);
gst_object_unref (gst_camera_bin);
gst_camera_bin = NULL;
@ -842,8 +855,21 @@ on_comboboxResolution_changed (GtkComboBox * widget, gpointer user_data)
g_list_nth_data (video_caps_list, gtk_combo_box_get_active (widget));
if (video_caps) {
GstState old;
gst_element_set_state (gst_camera_bin, GST_STATE_READY);
gst_element_get_state (gst_camera_bin, &old, NULL, GST_CLOCK_TIME_NONE);
GST_DEBUG ("change resolution in %s", gst_element_state_get_name (old));
if (old != GST_STATE_NULL) {
gst_element_set_state (gst_camera_bin, GST_STATE_READY);
/* source need to be NULL, otherwise changing the mode fails with device
* busy:
* - if src goes from NULL->PLAYING it sets new mode anyway
* - if src goes form READY->PLAYIN new mode is activated via reverse caps
* negotiation, but then the device is already streaming
*/
gst_element_set_state (gst_videosrc, GST_STATE_NULL);
}
st = gst_caps_get_structure (video_caps, 0);
@ -856,7 +882,9 @@ on_comboboxResolution_changed (GtkComboBox * widget, gpointer user_data)
g_object_set (G_OBJECT (gst_camera_bin), "filter-caps", video_caps, NULL);
gst_element_set_state (gst_camera_bin, GST_STATE_PLAYING);
if (old != GST_STATE_NULL) {
gst_element_set_state (gst_camera_bin, old);
}
}
}
@ -1198,15 +1226,16 @@ destroy_color_controls ()
{
GList *widgets, *item;
GtkWidget *widget = NULL;
gpointer user_data = NULL;
widgets = gtk_container_get_children (GTK_CONTAINER (ui_vbox_color_controls));
for (item = widgets; item; item = g_list_next (item)) {
widget = GTK_WIDGET (item->data);
user_data = g_object_get_data (G_OBJECT (widget), "channel");
g_signal_handlers_disconnect_by_func (widget, (GFunc) format_value_callback,
g_object_get_data (G_OBJECT (widget), "channel"));
user_data);
g_signal_handlers_disconnect_by_func (widget,
(GFunc) on_color_control_value_changed,
g_object_get_data (G_OBJECT (widget), "channel"));
(GFunc) on_color_control_value_changed, user_data);
gtk_container_remove (GTK_CONTAINER (ui_vbox_color_controls), widget);
}
g_list_free (widgets);
@ -1648,9 +1677,8 @@ main (int argc, char *argv[])
goto done;
}
/* create pipeline and run */
if (me_gst_setup_pipeline (NULL, NULL)) {
gtk_main ();
}
g_idle_add (me_gst_setup_default_pipeline, NULL);
gtk_main ();
done:
me_gst_cleanup_element ();