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b99ecc78ca
GLib guarantees libintl is always present, using proxy-libintl as last resort. There is no need to mock gettex API any more. This fix static build on Windows because G_INTL_STATIC_COMPILATION must be defined before including libintl.h, and glib does it for us as part as including glib.h. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2028>
260 lines
7.9 KiB
C
260 lines
7.9 KiB
C
/*
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* GStreamer
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* Copyright (C) 2008 Nokia Corporation <multimedia@maemo.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:camerabingeneral
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* @title: GstCameraBin2
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* @short_description: helper functions for #GstCameraBin2 and it's modules
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*
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* Common helper functions for #GstCameraBin2, #GstCameraBin2Image and
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* #GstCameraBin2Video.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <string.h>
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#include <glib.h>
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#include <gst/basecamerabinsrc/gstbasecamerasrc.h>
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#include <glib/gi18n-lib.h>
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#include "camerabingeneral.h"
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/**
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* gst_camerabin_add_element:
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* @bin: add an element to this bin
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* @new_elem: new element to be added
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*
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* Adds given element to given @bin. Looks for an unconnected src pad
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* from the @bin and links the element to it. Raises an error if adding
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* or linking failed. Unrefs the element in the case of an error.
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*
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* Returns: %TRUE if adding and linking succeeded, %FALSE otherwise.
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*/
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gboolean
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gst_camerabin_add_element (GstBin * bin, GstElement * new_elem)
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{
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return gst_camerabin_add_element_full (bin, NULL, new_elem, NULL);
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}
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/**
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* gst_camerabin_add_element_full:
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* @bin: add an element to this bin
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* @srcpad: src pad name, or NULL for any
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* @new_elem: new element to be added
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* @dstpad: dst pad name, or NULL for any
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*
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* Adds given element to given @bin. Looks for an unconnected src pad
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* (with name @srcpad, if specified) from the @bin and links the element
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* to it. Raises an error if adding or linking failed. Unrefs the element
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* in the case of an error.
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*
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* Returns: %TRUE if adding and linking succeeded, %FALSE otherwise.
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*/
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gboolean
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gst_camerabin_add_element_full (GstBin * bin, const gchar * srcpad,
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GstElement * new_elem, const gchar * dstpad)
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{
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gboolean ret;
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g_return_val_if_fail (bin, FALSE);
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g_return_val_if_fail (new_elem, FALSE);
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ret = gst_camerabin_try_add_element (bin, srcpad, new_elem, dstpad);
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if (!ret) {
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gchar *elem_name = gst_element_get_name (new_elem);
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GST_ELEMENT_ERROR (bin, CORE, NEGOTIATION, (NULL),
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("linking %s failed", elem_name));
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g_free (elem_name);
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gst_object_unref (new_elem);
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}
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return ret;
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}
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/**
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* gst_camerabin_try_add_element:
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* @bin: tries adding an element to this bin
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* @srcpad: src pad name, or NULL for any
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* @new_elem: new element to be added
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* @dstpad: dst pad name, or NULL for any
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*
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* Adds given element to given @bin. Looks for an unconnected src pad
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* (with name @srcpad, if specified) from the @bin and links the element to
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* it.
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*
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* Returns: %TRUE if adding and linking succeeded, %FALSE otherwise.
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*/
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gboolean
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gst_camerabin_try_add_element (GstBin * bin, const gchar * srcpad,
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GstElement * new_elem, const gchar * dstpad)
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{
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GstPad *bin_pad;
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GstElement *bin_elem;
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gboolean ret = TRUE;
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g_return_val_if_fail (bin, FALSE);
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g_return_val_if_fail (new_elem, FALSE);
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/* Get pads for linking */
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bin_pad = gst_bin_find_unlinked_pad (bin, GST_PAD_SRC);
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/* Add to bin */
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gst_bin_add (GST_BIN (bin), new_elem);
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/* Link, if unconnected pad was found, otherwise just add it to bin */
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if (bin_pad) {
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GST_DEBUG_OBJECT (bin, "linking %s to %s:%s", GST_OBJECT_NAME (new_elem),
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GST_DEBUG_PAD_NAME (bin_pad));
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bin_elem = gst_pad_get_parent_element (bin_pad);
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gst_object_unref (bin_pad);
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if (!gst_element_link_pads_full (bin_elem, srcpad, new_elem, dstpad,
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GST_PAD_LINK_CHECK_CAPS)) {
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gst_object_ref (new_elem);
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gst_bin_remove (bin, new_elem);
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ret = FALSE;
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}
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gst_object_unref (bin_elem);
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} else {
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GST_INFO_OBJECT (bin, "no unlinked source pad in bin");
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}
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return ret;
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}
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/**
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* gst_camerabin_create_and_add_element:
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* @bin: tries adding an element to this bin
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* @elem_name: name of the element to be created
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* @instance_name: name of the instance of the element to be created
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*
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* Creates an element according to given name and
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* adds it to given @bin. Looks for an unconnected src pad
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* from the @bin and links the element to it.
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*
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* Returns: pointer to the new element if successful, NULL otherwise.
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*/
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GstElement *
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gst_camerabin_create_and_add_element (GstBin * bin, const gchar * elem_name,
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const gchar * instance_name)
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{
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GstElement *new_elem;
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g_return_val_if_fail (bin, FALSE);
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g_return_val_if_fail (elem_name, FALSE);
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new_elem = gst_element_factory_make (elem_name, instance_name);
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if (!new_elem) {
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GST_ELEMENT_ERROR (bin, CORE, MISSING_PLUGIN,
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(_("Missing element '%s' - check your GStreamer installation."),
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elem_name), (NULL));
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} else if (!gst_camerabin_add_element (bin, new_elem)) {
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new_elem = NULL;
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}
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return new_elem;
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}
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/* try to change the state of an element. This function returns the element
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* when the state change could be performed. When this function returns NULL
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* an error occurred and the element is unreffed. */
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static GstElement *
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try_element (GstElement * bin, GstElement * element)
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{
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GstStateChangeReturn ret;
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if (element) {
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ret = gst_element_set_state (element, GST_STATE_READY);
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if (ret == GST_STATE_CHANGE_FAILURE) {
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GST_DEBUG_OBJECT (bin, "failed state change..");
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gst_element_set_state (element, GST_STATE_NULL);
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gst_object_unref (element);
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element = NULL;
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}
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}
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return element;
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}
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GstElement *
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gst_camerabin_setup_default_element (GstBin * bin, GstElement * user_elem,
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const gchar * auto_elem_name, const gchar * default_elem_name,
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const gchar * instance_name)
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{
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GstElement *elem;
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if (user_elem) {
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GST_DEBUG_OBJECT (bin, "trying configured element");
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elem = try_element (GST_ELEMENT_CAST (bin), gst_object_ref (user_elem));
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} else {
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/* only try fallback if no specific sink was chosen */
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GST_DEBUG_OBJECT (bin, "trying %s", auto_elem_name);
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elem = gst_element_factory_make (auto_elem_name, instance_name);
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elem = try_element (GST_ELEMENT_CAST (bin), elem);
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if (elem == NULL) {
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/* if default sink from config.h is different then try it too */
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if (strcmp (default_elem_name, auto_elem_name)) {
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GST_DEBUG_OBJECT (bin, "trying %s", default_elem_name);
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elem = gst_element_factory_make (default_elem_name, instance_name);
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elem = try_element (GST_ELEMENT_CAST (bin), elem);
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}
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}
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}
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return elem;
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}
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/**
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* gst_camerabin_remove_elements_from_bin:
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* @bin: removes all elements from this bin
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*
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* Removes all elements from this @bin.
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*/
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void
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gst_camerabin_remove_elements_from_bin (GstBin * bin)
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{
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GstIterator *iter = NULL;
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GValue value = { 0 };
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GstElement *elem = NULL;
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gboolean done = FALSE;
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iter = gst_bin_iterate_elements (bin);
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while (!done) {
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switch (gst_iterator_next (iter, &value)) {
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case GST_ITERATOR_OK:
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elem = (GstElement *) g_value_get_object (&value);
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gst_bin_remove (bin, elem);
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gst_element_set_state (GST_ELEMENT (elem), GST_STATE_NULL);
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/* Iterator increased the element refcount, so unref */
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g_value_unset (&value);
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break;
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case GST_ITERATOR_RESYNC:
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gst_iterator_resync (iter);
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break;
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case GST_ITERATOR_ERROR:
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GST_WARNING_OBJECT (bin, "error in iterating elements");
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done = TRUE;
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break;
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case GST_ITERATOR_DONE:
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done = TRUE;
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break;
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}
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}
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gst_iterator_free (iter);
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}
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