mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-09-27 06:20:12 +00:00
huge modifications, hope i didn't break something:
Original commit message from CVS: huge modifications, hope i didn't break something: - added functions for setting/getting locked state of elements. gst_element_lock_state syncs the pads state with the state of its parent. - made all gst_element_link_* functions call gst_element_link_pads_filtered - gst_element_link_pads_filtered now accepts NULL as a pad name. - make sure the link functions are only called when the elements are paused That's it.
This commit is contained in:
Benjamin Otte
parent
62d382149a
commit
a03e803bb6
2 changed files with 191 additions and 81 deletions
268
gst/gstelement.c
268
gst/gstelement.c
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@ -1402,78 +1402,141 @@ gst_element_get_compatible_pad (GstElement *element, GstPad *pad)
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}
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/**
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* gst_element_link_filtered:
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* gst_element_link_pads_filtered:
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* @src: a #GstElement containing the source pad.
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* @srcpadname: the name of the #GstPad in source element or NULL for any element.
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* @dest: the #GstElement containing the destination pad.
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* @destpadname: the name of the #GstPad in destination element or NULL for any element.
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* @filtercaps: the #GstCaps to use as a filter.
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*
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* Links the source to the destination element using the filtercaps.
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* The link must be from source to destination, the other
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* direction will not be tried.
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* The functions looks for existing pads that aren't linked yet.
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* It will use request pads if possible. But both pads will not be requested.
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* If multiple links are possible, only one is established.
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* Links the two named pads of the source and destination elements.
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* Side effect is that if one of the pads has no parent, it becomes a
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* child of the parent of the other element. If they have different
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* parents, the link fails.
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*
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* Returns: TRUE if the elements could be linked.
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* Returns: TRUE if the pads could be linked.
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*/
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gboolean
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gst_element_link_filtered (GstElement *src, GstElement *dest,
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GstCaps *filtercaps)
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gst_element_link_pads_filtered (GstElement *src, const gchar *srcpadname,
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GstElement *dest, const gchar *destpadname,
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GstCaps *filtercaps)
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{
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const GList *srcpads, *destpads, *srctempls, *desttempls, *l;
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GstPad *srcpad, *destpad;
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GstPadTemplate *srctempl, *desttempl;
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/* checks */
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g_return_val_if_fail (src != NULL, FALSE);
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g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
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g_return_val_if_fail (dest != NULL, FALSE);
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g_return_val_if_fail (GST_IS_ELEMENT (dest), FALSE);
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g_return_val_if_fail (GST_STATE (src) != GST_STATE_PLAYING, FALSE);
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g_return_val_if_fail (GST_STATE (dest) != GST_STATE_PLAYING, FALSE);
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "trying to link element %s to element %s",
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GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
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srcpads = gst_element_get_pad_list (src);
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destpads = gst_element_get_pad_list (dest);
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GST_INFO (GST_CAT_ELEMENT_PADS, "trying to link element %s:%s to element %s:%s",
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GST_ELEMENT_NAME (src), srcpadname ? srcpadname : "(any)",
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GST_ELEMENT_NAME (dest), destpadname ? destpadname : "(any)");
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if (srcpads || destpads) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "looping through src and dest pads");
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/* loop through the existing pads in the source, trying to find a
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/* now get the pads we're trying to link and a list of all remaining pads */
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if (srcpadname) {
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srcpad = gst_element_get_pad (src, srcpadname);
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if (!srcpad) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "no pad %s:%s", GST_ELEMENT_NAME (src), srcpadname);
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return FALSE;
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} else {
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if (!(GST_RPAD_DIRECTION (srcpad) == GST_PAD_SRC)) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is no src pad", GST_DEBUG_PAD_NAME (srcpad));
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return FALSE;
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}
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if (GST_PAD_PEER (srcpad) != NULL) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is already linked", GST_DEBUG_PAD_NAME (srcpad));
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return FALSE;
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}
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}
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srcpads = NULL;
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} else {
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srcpads = gst_element_get_pad_list (src);
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srcpad = srcpads ? (GstPad *) GST_PAD_REALIZE (srcpads->data) : NULL;
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}
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if (destpadname) {
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destpad = gst_element_get_pad (dest, destpadname);
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if (!destpad) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "no pad %s:%s", GST_ELEMENT_NAME (dest), destpadname);
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return FALSE;
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} else {
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if (!(GST_RPAD_DIRECTION (destpad) == GST_PAD_SINK)) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is no sink pad", GST_DEBUG_PAD_NAME (destpad));
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return FALSE;
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}
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if (GST_PAD_PEER (destpad) != NULL) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "pad %s:%s is already linked", GST_DEBUG_PAD_NAME (destpad));
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return FALSE;
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}
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}
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destpads = NULL;
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} else {
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destpads = gst_element_get_pad_list (dest);
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destpad = destpads ? (GstPad *) GST_PAD_REALIZE (destpads->data) : NULL;
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}
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if (srcpadname && destpadname) {
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/* two explicitly specified pads */
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return gst_pad_link_filtered (srcpad, destpad, filtercaps);
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}
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if (srcpad) {
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/* loop through the allowed pads in the source, trying to find a
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* compatible destination pad */
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while (srcpads) {
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srcpad = (GstPad *) GST_PAD_REALIZE (srcpads->data);
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "looping through allowed src and dest pads");
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do {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "trying src pad %s:%s",
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GST_DEBUG_PAD_NAME (srcpad));
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if ((GST_RPAD_DIRECTION (srcpad) == GST_PAD_SRC) &&
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(GST_PAD_PEER (srcpad) == NULL)) {
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destpad = gst_element_get_compatible_pad_filtered (dest, srcpad,
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GstPad *temp = gst_element_get_compatible_pad_filtered (dest, srcpad,
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filtercaps);
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if (destpad && gst_pad_link_filtered (srcpad, destpad, filtercaps)) {
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if (temp && gst_pad_link_filtered (srcpad, temp, filtercaps)) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "linked pad %s:%s to pad %s:%s",
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GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
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GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (temp));
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return TRUE;
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}
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}
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srcpads = g_list_next (srcpads);
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}
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/* find a better way for this mess */
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if (srcpads) {
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srcpads = g_list_next (srcpads);
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if (srcpads)
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srcpad = (GstPad *) GST_PAD_REALIZE (srcpads->data);
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}
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} while (srcpads);
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}
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if (srcpadname) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s:%s to %s",
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GST_DEBUG_PAD_NAME (srcpad), GST_ELEMENT_NAME (dest));
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return FALSE;
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}
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if (destpad) {
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/* loop through the existing pads in the destination */
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while (destpads) {
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destpad = (GstPad *) GST_PAD_REALIZE (destpads->data);
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do {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "trying dest pad %s:%s",
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GST_DEBUG_PAD_NAME (destpad));
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if ((GST_RPAD_DIRECTION (destpad) == GST_PAD_SINK) &&
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(GST_PAD_PEER (destpad) == NULL)) {
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srcpad = gst_element_get_compatible_pad_filtered (src, destpad,
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GstPad *temp = gst_element_get_compatible_pad_filtered (src, destpad,
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filtercaps);
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if (srcpad && gst_pad_link_filtered (srcpad, destpad, filtercaps)) {
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if (temp && gst_pad_link_filtered (temp, destpad, filtercaps)) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "linked pad %s:%s to pad %s:%s",
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GST_DEBUG_PAD_NAME (srcpad), GST_DEBUG_PAD_NAME (destpad));
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GST_DEBUG_PAD_NAME (temp), GST_DEBUG_PAD_NAME (destpad));
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return TRUE;
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}
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}
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destpads = g_list_next (destpads);
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}
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if (destpads) {
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destpads = g_list_next (destpads);
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if (destpads)
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destpad = (GstPad *) GST_PAD_REALIZE (destpads->data);
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}
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} while (destpads);
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}
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if (destpadname) {
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GST_DEBUG (GST_CAT_ELEMENT_PADS, "no link possible from %s to %s:%s",
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GST_ELEMENT_NAME (src), GST_DEBUG_PAD_NAME (destpad));
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return FALSE;
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}
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GST_DEBUG (GST_CAT_ELEMENT_PADS,
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@ -1515,6 +1578,27 @@ gst_element_link_filtered (GstElement *src, GstElement *dest,
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GST_ELEMENT_NAME (src), GST_ELEMENT_NAME (dest));
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return FALSE;
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}
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/**
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* gst_element_link_filtered:
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* @src: a #GstElement containing the source pad.
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* @dest: the #GstElement containing the destination pad.
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* @filtercaps: the #GstCaps to use as a filter.
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*
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* Links the source to the destination element using the filtercaps.
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* The link must be from source to destination, the other
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* direction will not be tried.
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* The functions looks for existing pads that aren't linked yet.
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* It will use request pads if possible. But both pads will not be requested.
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* If multiple links are possible, only one is established.
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*
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* Returns: TRUE if the elements could be linked.
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*/
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gboolean
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gst_element_link_filtered (GstElement *src, GstElement *dest,
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GstCaps *filtercaps)
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{
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return gst_element_link_pads_filtered (src, NULL, dest, NULL, filtercaps);
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}
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/**
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* gst_element_link_many:
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@ -1567,52 +1651,7 @@ gst_element_link_many (GstElement *element_1, GstElement *element_2, ...)
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gboolean
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gst_element_link (GstElement *src, GstElement *dest)
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{
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return gst_element_link_filtered (src, dest, NULL);
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}
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/**
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* gst_element_link_pads_filtered:
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* @src: a #GstElement containing the source pad.
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* @srcpadname: the name of the #GstPad in source element.
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* @dest: the #GstElement containing the destination pad.
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* @destpadname: the name of the #GstPad in destination element.
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* @filtercaps: the #GstCaps to use as a filter.
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*
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* Links the two named pads of the source and destination elements.
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* Side effect is that if one of the pads has no parent, it becomes a
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* child of the parent of the other element. If they have different
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* parents, the link fails.
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*
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* Returns: TRUE if the pads could be linked.
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*/
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gboolean
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gst_element_link_pads_filtered (GstElement *src, const gchar *srcpadname,
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GstElement *dest, const gchar *destpadname,
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GstCaps *filtercaps)
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{
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GstPad *srcpad,*destpad;
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g_return_val_if_fail (src != NULL, FALSE);
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g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
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g_return_val_if_fail (srcpadname != NULL, FALSE);
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g_return_val_if_fail (dest != NULL, FALSE);
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g_return_val_if_fail (GST_IS_ELEMENT (dest), FALSE);
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g_return_val_if_fail (destpadname != NULL, FALSE);
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/* obtain the pads requested */
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srcpad = gst_element_get_pad (src, srcpadname);
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if (srcpad == NULL) {
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GST_ERROR (src, "source element has no pad \"%s\"", srcpadname);
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return FALSE;
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}
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destpad = gst_element_get_pad (dest, destpadname);
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if (srcpad == NULL) {
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GST_ERROR (dest, "destination element has no pad \"%s\"", destpadname);
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return FALSE;
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}
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/* we're satisified they can be linked, let's do it */
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return gst_pad_link_filtered (srcpad, destpad, filtercaps);
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return gst_element_link_pads_filtered (src, NULL, dest, NULL, NULL);
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}
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/**
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@ -2049,6 +2088,73 @@ gst_element_error (GstElement *element, const gchar *error, ...)
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g_free (string);
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}
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/**
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* gst_element_is_state_locked:
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* @element: a #GstElement.
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*
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* Checks if the state of an element is locked.
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* If the state of an element is locked, state changes of the parent don't
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* affect the element.
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* This way you can leave currently unused elements inside bins. Just lock their
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* state before changing the state from #GST_STATE_NULL.
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*
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* Returns: TRUE, if the element's state is locked.
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*/
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gboolean
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gst_element_is_state_locked (GstElement *element)
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{
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g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
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return GST_FLAG_IS_SET (element, GST_ELEMENT_LOCKED_STATE) ? TRUE : FALSE;
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}
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/**
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* gst_element_lock_state:
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* @element: a #GstElement.
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*
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* Locks the state of an element, so state changes of the parent don't affect
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* this element anymore.
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*
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* Returns: TRUE, if the element's state could be locked.
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*/
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gboolean
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gst_element_lock_state (GstElement *element)
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{
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g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
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GST_INFO (GST_CAT_STATES, "locking state of element %s\n", GST_ELEMENT_NAME (element));
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GST_FLAG_SET (element, GST_ELEMENT_LOCKED_STATE);
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return TRUE;
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}
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/**
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* gst_element_unlock_state:
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* @element: a #GstElement.
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*
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* Unlocks the state of an element and synchronises the state with the parent.
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* If this function succeeds, the state of this element is identical to the
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* state of it's bin.
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* When this function fails, the state of the element is undefined.
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*
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* Returns: TRUE, if the element's state could be unlocked.
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*/
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gboolean
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gst_element_unlock_state (GstElement *element)
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{
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g_return_val_if_fail (GST_IS_ELEMENT (element), FALSE);
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GST_INFO (GST_CAT_STATES, "unlocking state of element %s\n", GST_ELEMENT_NAME (element));
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GST_FLAG_UNSET (element, GST_ELEMENT_LOCKED_STATE);
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if (GST_ELEMENT_PARENT(element)) {
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GST_DEBUG (GST_CAT_STATES, "setting state of unlocked element %s to %s\n", GST_ELEMENT_NAME (element), gst_element_state_get_name (GST_STATE (GST_ELEMENT_PARENT(element))));
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GstElementState old_state = GST_STATE (element);
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if (gst_element_set_state (element, GST_STATE (GST_ELEMENT_PARENT(element))) == GST_STATE_FAILURE) {
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GST_DEBUG (GST_CAT_STATES, "state change of unlocked element %s to %s stopped at %s, resetting\n", GST_ELEMENT_NAME (element),
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gst_element_state_get_name (GST_STATE (GST_ELEMENT_PARENT(element))), gst_element_state_get_name (GST_STATE (element)));
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gst_element_set_state (element, old_state);
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return FALSE;
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}
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}
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return TRUE;
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}
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/**
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* gst_element_get_state:
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* @element: a #GstElement to get the state of.
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@ -325,6 +325,10 @@ void gst_element_set_eos (GstElement *element);
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void gst_element_error (GstElement *element, const gchar *error, ...);
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gboolean gst_element_is_state_locked (GstElement *element);
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gboolean gst_element_lock_state (GstElement *element);
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gboolean gst_element_unlock_state (GstElement *element);
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GstElementState gst_element_get_state (GstElement *element);
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GstElementStateReturn gst_element_set_state (GstElement *element, GstElementState state);
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