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camerabin2: Avoid blocking in start-capture and send application tags later

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Tags are currently sent from start-capture, which is run in the
application thread. For images we can delay the tags pushing to the
buffer probe and push the tags with the location event and reduce
start-capture time.
This commit is contained in:
Lasse Laukkanen 2011-11-09 09:41:44 -03:00 committed by Thiago Santos
parent e40ca78278
commit 5ca3c9477e
2 changed files with 45 additions and 7 deletions
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49
gst/camerabin2/gstcamerabin2.c
View file

@ -429,21 +429,27 @@ gst_camera_bin_start_capture (GstCameraBin2 * camerabin)
if (taglist) {
GstPad *active_pad;
GST_DEBUG_OBJECT (camerabin, "Pushing tags from application: %"
GST_DEBUG_OBJECT (camerabin, "Have tags from application: %"
GST_PTR_FORMAT, taglist);
if (camerabin->mode == MODE_IMAGE) {
active_pad = gst_element_get_static_pad (camerabin->src,
GST_BASE_CAMERA_SRC_IMAGE_PAD_NAME);
/* Store image tags in a list and push them later, this prevents
start_capture() from blocking in pad_push_event call */
g_mutex_lock (camerabin->image_tags_mutex);
camerabin->image_tags_list =
g_slist_append (camerabin->image_tags_list,
gst_tag_list_copy (taglist));
g_mutex_unlock (camerabin->image_tags_mutex);
} else {
active_pad = gst_element_get_static_pad (camerabin->src,
GST_BASE_CAMERA_SRC_VIDEO_PAD_NAME);
}
gst_pad_push_event (active_pad,
gst_event_new_tag (gst_tag_list_copy (taglist)));
gst_pad_push_event (active_pad,
gst_event_new_tag (gst_tag_list_copy (taglist)));
gst_object_unref (active_pad);
gst_object_unref (active_pad);
}
}
GST_DEBUG_OBJECT (camerabin, "Start-capture end");
}
static void
@ -526,6 +532,7 @@ gst_camera_bin_dispose (GObject * object)
g_free (camerabin->location);
g_mutex_free (camerabin->preview_list_mutex);
g_mutex_free (camerabin->image_tags_mutex);
if (camerabin->src_capture_notify_id)
g_signal_handler_disconnect (camerabin->src,
@ -882,6 +889,7 @@ gst_camera_bin_init (GstCameraBin2 * camera)
camera->max_zoom = MAX_ZOOM;
camera->flags = DEFAULT_FLAGS;
camera->preview_list_mutex = g_mutex_new ();
camera->image_tags_mutex = g_mutex_new ();
/* capsfilters are created here as we proxy their caps properties and
* this way we avoid having to store the caps while on NULL state to
@ -1263,7 +1271,27 @@ gst_camera_bin_image_src_buffer_probe (GstPad * pad, GstBuffer * buf,
GstEvent *evt;
gchar *location = NULL;
GstPad *peer;
GstTagList *tags;
/* Push pending image tags */
g_mutex_lock (camerabin->image_tags_mutex);
if (camerabin->image_tags_list) {
tags = camerabin->image_tags_list->data;
camerabin->image_tags_list =
g_slist_delete_link (camerabin->image_tags_list,
camerabin->image_tags_list);
g_mutex_unlock (camerabin->image_tags_mutex);
GST_DEBUG_OBJECT (camerabin, "Pushing tags from application: %"
GST_PTR_FORMAT, tags);
peer = gst_pad_get_peer (pad);
gst_pad_send_event (peer, gst_event_new_tag (tags));
gst_object_unref (peer);
} else {
g_mutex_unlock (camerabin->image_tags_mutex);
GST_DEBUG_OBJECT (camerabin, "No tags from application to send");
}
/* Push image location event */
if (camerabin->image_location_list) {
location = camerabin->image_location_list->data;
camerabin->image_location_list =
@ -1775,6 +1803,13 @@ gst_camera_bin_change_state (GstElement * element, GstStateChange trans)
g_slist_free (camera->image_location_list);
camera->image_location_list = NULL;
g_mutex_lock (camera->image_tags_mutex);
g_slist_foreach (camera->image_tags_list, (GFunc) gst_tag_list_free,
NULL);
g_slist_free (camera->image_tags_list);
camera->image_tags_list = NULL;
g_mutex_unlock (camera->image_tags_mutex);
g_mutex_lock (camera->preview_list_mutex);
g_slist_foreach (camera->preview_location_list, (GFunc) g_free, NULL);
g_slist_free (camera->preview_location_list);

3
gst/camerabin2/gstcamerabin2.h
View file

@ -93,6 +93,9 @@ struct _GstCameraBin2
* as file location change notifications, they are pushed before
* each buffer capture */
GSList *image_location_list;
/* Store also tags and push them before each captured image */
GMutex *image_tags_mutex;
GSList *image_tags_list;
/*
* Similar to above, but used for giving names to previews