From dcd516e20d4e8c2fc4c93e3d6d5bec8e6f49c76c Mon Sep 17 00:00:00 2001 From: Christian Pointner Date: Wed, 24 Sep 2014 22:39:39 +0200 Subject: moved gstreamer utility functions to seperate file --- src/utils.c | 121 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 121 insertions(+) create mode 100644 src/utils.c (limited to 'src/utils.c') diff --git a/src/utils.c b/src/utils.c new file mode 100644 index 0000000..6511a52 --- /dev/null +++ b/src/utils.c @@ -0,0 +1,121 @@ +/* + * sydra + * + * sydra is a toolbox which allows you to set up multiple bidirectional + * Video/Audio streams from external locations. + * sydra has been written to be used for the Elevate Festival in Graz + * Austria in order to involve external locations to present themselves + * at the festival. + * Sydra is based on GStreamer and is written in C. + * + * + * Copyright (C) 2014 Christian Pointner + * + * This file is part of sydra. + * + * sydra is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * any later version. + * + * sydra is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with sydra. If not, see . + * + * In addition, as a special exception, the copyright holders hereby + * grant permission for non-GPL-compatible GStreamer plugins to be used + * and distributed together with GStreamer and sydra. + * This permission goes above and beyond the permissions granted by the + * GPL license sydra is covered by. + */ + +#include "utils.h" +#include "log.h" +#include + +GstElement* sydra_create_bin_from_desc(const char* type, const char* desc) +{ + GError *error = NULL; + GstElement *bin = gst_parse_bin_from_description(desc, TRUE, &error); + if(!bin) { + log_printf(ERROR, "Bin description for %s parser error: %s", type, error ? error->message : "unknown"); + g_error_free(error); + return NULL; + } + if(error) { + log_printf(WARNING, "Bin description for %s parser warning: %s", type, error ? error->message : "unknown"); + g_error_free(error); + } + return bin; +} + +GstElement* sydra_create_element(const char* type, const char* name) +{ + GstElement *e = gst_element_factory_make (type, name); + if(!e) { + log_printf(ERROR, "Error creating element %s%sof type %s", name ? name : "", name ? " " : "", type); + return NULL; + } + return e; +} + +static gboolean sydra_link_pads(GstElement* src, GstPad* src_pad, const char* src_pad_name, GstElement* sink, GstPad* sink_pad, const char* sink_pad_name) +{ + if(!src_pad || !sink_pad) + return FALSE; + + GstPadLinkReturn ret = gst_pad_link(src_pad, sink_pad); + gst_object_unref(GST_OBJECT(src_pad)); + gst_object_unref(GST_OBJECT(sink_pad)); + + if(GST_PAD_LINK_FAILED(ret)) { + gchar* src_name = gst_element_get_name(src); + gchar* sink_name = gst_element_get_name(sink); + log_printf(ERROR, "Error linking pad '%s' of '%s' with pad '%s' of '%s'", + src_pad_name, src_name, sink_pad_name, sink_name); + g_free(src_name); + g_free(sink_name); + return FALSE; + } + return TRUE; +} + +gboolean sydra_link_request_static(GstElement* src, const char* src_pad_name, GstElement* sink, const char* sink_pad_name) +{ + GstPad *src_pad = gst_element_get_request_pad(src, src_pad_name); + GstPad *sink_pad = gst_element_get_static_pad(sink, sink_pad_name); + return sydra_link_pads(src, src_pad, src_pad_name, sink, sink_pad, sink_pad_name); +} + +gboolean sydra_link_static_request(GstElement* src, const char* src_pad_name, GstElement* sink, const char* sink_pad_name) +{ + GstPad *src_pad = gst_element_get_static_pad(src, src_pad_name); + GstPad *sink_pad = gst_element_get_request_pad(sink, sink_pad_name); + return sydra_link_pads(src, src_pad, src_pad_name, sink, sink_pad, sink_pad_name); +} + +gboolean sydra_link_static_static(GstElement* src, const char* src_pad_name, GstElement* sink, const char* sink_pad_name) +{ + GstPad *src_pad = gst_element_get_static_pad(src, src_pad_name); + GstPad *sink_pad = gst_element_get_static_pad(sink, sink_pad_name); + return sydra_link_pads(src, src_pad, src_pad_name, sink, sink_pad, sink_pad_name); +} + +gboolean sydra_link_static_compatible(GstElement* src, const char* src_pad_name, GstElement* sink) +{ + GstPad *src_pad = gst_element_get_static_pad(src, src_pad_name); + if(!src_pad) return FALSE; + + GstPad *sink_pad = gst_element_get_compatible_pad(sink, src_pad, NULL); + if(!sink_pad) return FALSE; + + gchar* sink_pad_name = gst_pad_get_name(sink_pad); + gboolean res = sydra_link_pads(src, src_pad, src_pad_name, sink, sink_pad, sink_pad_name); + g_free(sink_pad_name); + + return res; +} -- cgit v1.2.3