mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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b1df15f5cb
Original commit message from CVS: Adding needed license information. The patch was reviewed and approved by Christian Shaller. Ronald Bultje and Benjamin also responded with comments.
332 lines
8.4 KiB
C
332 lines
8.4 KiB
C
/* GStreamer
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* Copyright (C) <2002> Thomas Vander Stichele <thomas@apestaart.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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* this library handles interaction with GConf
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*/
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#include "gconf.h"
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#define GST_GCONF_DIR "/system/gstreamer"
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static GConfClient *_gst_gconf_client = NULL; /* GConf connection */
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/* internal functions */
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static GConfClient *
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gst_gconf_get_client (void)
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{
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if (!_gst_gconf_client)
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_gst_gconf_client = gconf_client_get_default ();
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return _gst_gconf_client;
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}
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/* go through a bin, finding the one pad that is unconnected in the given
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* * direction, and return that pad */
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static GstPad *
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gst_bin_find_unconnected_pad (GstBin *bin, GstPadDirection direction)
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{
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GstPad *pad = NULL;
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GList *elements = NULL;
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const GList *pads = NULL;
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GstElement *element = NULL;
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elements = (GList *) gst_bin_get_list (bin);
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/* traverse all elements looking for unconnected pads */
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while (elements && pad == NULL)
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{
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element = GST_ELEMENT (elements->data);
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pads = gst_element_get_pad_list (element);
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while (pads)
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{
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/* check if the direction matches */
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if (GST_PAD_DIRECTION (GST_PAD (pads->data)) == direction)
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{
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if (GST_PAD_PEER (GST_PAD (pads->data)) == NULL)
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{
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/* found it ! */
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pad = GST_PAD (pads->data);
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}
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}
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if (pad) break; /* found one already */
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pads = g_list_next (pads);
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}
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elements = g_list_next (elements);
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}
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return pad;
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}
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/* external functions */
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/**
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* gst_gconf_get_string:
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* @key: a #gchar corresponding to the key you want to get.
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*
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* Get GConf key @key's string value.
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*
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* Returns: a #gchar string containing @key's value.
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*/
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gchar *
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gst_gconf_get_string (const gchar *key)
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{
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GError *error = NULL;
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gchar *value = NULL;
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gchar *full_key = g_strdup_printf ("%s/%s", GST_GCONF_DIR, key);
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value = gconf_client_get_string (gst_gconf_get_client (), full_key, &error);
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g_free (full_key);
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if (error)
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{
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g_print ("gst_gconf_get_string: error: %s\n", error->message);
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g_error_free (error);
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}
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/* FIXME: decide if we want to strdup this value; if we do, check for NULL */
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return value;
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}
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/**
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* gst_gconf_set_string:
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* @key: a #gchar corresponding to the key you want to set.
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* @value: a #gchar containing key value.
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*
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* Set GConf key @key to string value @value.
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*/
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void
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gst_gconf_set_string (const gchar *key, const gchar *value)
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{
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GError *error = NULL;
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gchar *full_key = g_strdup_printf ("%s/%s", GST_GCONF_DIR, key);
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gconf_client_set_string (gst_gconf_get_client (), full_key, value, &error);
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if (error)
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{
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g_print ("gst_gconf_set_string: error: %s\n", error->message);
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g_error_free (error);
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}
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g_free (full_key);
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}
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/**
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* gst_gconf_render_bin_from_description:
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* @description: a #gchar string describing the bin.
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*
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* Render bin from description @description.
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*
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* Returns: a #GstElement containing the rendered bin.
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*/
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GstElement *
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gst_gconf_render_bin_from_description (const gchar *description)
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{
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GstElement *bin = NULL;
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GstPad *pad = NULL;
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GError *error = NULL;
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gchar *desc = NULL;
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/* parse the pipeline to a bin */
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desc = g_strdup_printf ("bin.( %s )", description);
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bin = GST_ELEMENT (gst_parse_launch (desc, &error));
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g_free (desc);
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if (error)
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{
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g_print ("DEBUG: gstgconf: error parsing pipeline %s\n%s\n",
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description, error->message);
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g_error_free (error);
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return NULL;
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}
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/* find pads and ghost them if necessary */
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if ((pad = gst_bin_find_unconnected_pad (GST_BIN (bin), GST_PAD_SRC))){
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gst_element_add_ghost_pad (bin, pad, "src");
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}
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if ((pad = gst_bin_find_unconnected_pad (GST_BIN (bin), GST_PAD_SINK))){
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gst_element_add_ghost_pad (bin, pad, "sink");
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}
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return bin;
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}
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/**
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* gst_gconf_render_bin_from_key:
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* @key: a #gchar string corresponding to a GConf key.
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*
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* Render bin from GConf key @key.
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*
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* Returns: a #GstElement containing the rendered bin.
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*/
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GstElement *
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gst_gconf_render_bin_from_key (const gchar *key)
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{
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GstElement *bin = NULL;
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gchar *value;
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value = gst_gconf_get_string (key);
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if (value)
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bin = gst_gconf_render_bin_from_description (value);
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return bin;
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}
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/**
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* gst_gconf_get_default_audio_sink:
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*
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* Render audio output bin from GStreamer GConf key : "default/audiosink".
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* If key is invalid osssink is used as default output plugin.
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*
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* Returns: a #GstElement containing the audio output bin, or NULL if
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* everything failed.
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*/
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GstElement *
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gst_gconf_get_default_audio_sink (void)
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{
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GstElement *ret = gst_gconf_render_bin_from_key ("default/audiosink");
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if (!ret) {
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ret = gst_element_factory_make ("osssink", NULL);
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if (!ret)
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g_warning ("No GConf default audio sink key and osssink doesn't work");
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else
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g_print ("GConf audio sink not found, using osssink");
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}
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return ret;
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}
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/**
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* gst_gconf_get_default_video_sink:
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*
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* Render video output bin from GStreamer GConf key : "default/videosink".
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* If key is invalid xvideosink is used as default output plugin.
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*
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* Returns: a #GstElement containing the video output bin, or NULL if
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* everything failed.
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*/
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GstElement *
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gst_gconf_get_default_video_sink (void)
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{
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GstElement *ret = gst_gconf_render_bin_from_key ("default/videosink");
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if (!ret) {
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ret = gst_element_factory_make ("xvideosink", NULL);
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if (!ret)
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g_warning ("No GConf default video sink key and xvideosink doesn't work");
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else
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g_print ("GConf video sink not found, using xvideosink");
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}
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return ret;
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}
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/**
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* gst_gconf_get_default_audio_src:
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*
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* Render audio acquisition bin from GStreamer GConf key : "default/audiosrc".
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* If key is invalid osssrc is used as default source.
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*
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* Returns: a #GstElement containing the audio source bin, or NULL if
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* everything failed.
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*/
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GstElement *
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gst_gconf_get_default_audio_src (void)
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{
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GstElement *ret = gst_gconf_render_bin_from_key ("default/audiosrc");
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if (!ret) {
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ret = gst_element_factory_make ("osssrc", NULL);
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if (!ret)
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g_warning ("No GConf default audio src key and osssrc doesn't work");
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else
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g_print ("GConf audio src not found, using osssrc");
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}
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return ret;
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}
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/**
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* gst_gconf_get_default_video_src:
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*
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* Render video acquisition bin from GStreamer GConf key :
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* "default/videosrc". If key is invalid videotestsrc
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* is used as default source.
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*
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* Returns: a #GstElement containing the video source bin, or NULL if
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* everything failed.
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*/
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GstElement *
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gst_gconf_get_default_video_src (void)
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{
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GstElement *ret = gst_gconf_render_bin_from_key ("default/videosrc");
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if (!ret) {
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ret = gst_element_factory_make ("videotestsrc", NULL);
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if (!ret)
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g_warning ("No GConf default video src key and videotestrc doesn't work");
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else
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g_print ("GConf video src not found, using videotestrc");
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}
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return ret;
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}
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/**
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* gst_gconf_get_default_visualisation_element:
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*
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* Render visualisation bin from GStreamer GConf key : "default/visualisation".
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* If key is invalid goom is used as default visualisation element.
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*
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* Returns: a #GstElement containing the visualisation bin, or NULL if
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* everything failed.
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*/
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GstElement *
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gst_gconf_get_default_visualisation_element (void)
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{
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GstElement *ret = gst_gconf_render_bin_from_key ("default/visualisation");
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if (!ret) {
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ret = gst_element_factory_make ("goom", NULL);
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if (!ret)
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g_warning ("No GConf default visualisation plugin key and goom doesn't work");
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else
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g_print ("GConf visualisation plugin not found, using goom");
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}
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return ret;
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}
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static gboolean
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plugin_init (GModule *module, GstPlugin *plugin)
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{
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gst_plugin_set_longname (plugin,
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"Convenience routines for GConf interaction");
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return TRUE;
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}
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GstPluginDesc plugin_desc = {
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GST_VERSION_MAJOR,
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GST_VERSION_MINOR,
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"gstgconf",
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plugin_init
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};
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