Add an example program for the matrix plugin

diff --git a/c/gst-matrix-example/Makefile b/c/gst-matrix-example/Makefile
new file mode 100644 (file)
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+++ b/c/gst-matrix-example/Makefile
@@ -0,0 +1,39 @@
+CFLAGS = -std=c99 -pedantic -pedantic-errors -Wall -g3 -O2 -D_ANSI_SOURCE_
+CFLAGS += -fno-common \
+         -Wall \
+         -Wdeclaration-after-statement \
+         -Wextra \
+         -Wformat=2 \
+         -Winit-self \
+         -Winline \
+         -Wpacked \
+         -Wp,-D_FORTIFY_SOURCE=2 \
+         -Wpointer-arith \
+         -Wlarger-than-65500 \
+         -Wmissing-declarations \
+         -Wmissing-format-attribute \
+         -Wmissing-noreturn \
+         -Wmissing-prototypes \
+         -Wnested-externs \
+         -Wold-style-definition \
+         -Wredundant-decls \
+         -Wsign-compare \
+         -Wstrict-aliasing=2 \
+         -Wstrict-prototypes \
+         -Wundef \
+         -Wunreachable-code \
+         -Wunsafe-loop-optimizations \
+         -Wunused-but-set-variable \
+         -Wwrite-strings
+
+CFLAGS += $(shell pkg-config --cflags gstreamer-1.0)
+LDLIBS += $(shell pkg-config --libs gstreamer-1.0)
+
+gst-matrix-example: gst-matrix-example.o
+
+clean:
+       rm -f *~ *.o gst-matrix-example
+
+test: gst-matrix-example
+       G_DEBUG=gc-friendly G_SLICE=always-malloc \
+       valgrind --leak-check=full --show-reachable=yes ./gst-matrix-example

diff --git a/c/gst-matrix-example/README.txt b/c/gst-matrix-example/README.txt
new file mode 100644 (file)
index 0000000..8ba9d1b
--- /dev/null
+++ b/c/gst-matrix-example/README.txt
@@ -0,0 +1,3 @@
+If you need to use a custom version of gst-plugins-bad, use something like:
+
+GST_PLUGIN_PATH=${SOMEPATH}/gst-plugins-bad/gst/geometrictransform/ ./gst-matrix-example

diff --git a/c/gst-matrix-example/gst-matrix-example.c b/c/gst-matrix-example/gst-matrix-example.c
new file mode 100644 (file)
index 0000000..2996c47
--- /dev/null
+++ b/c/gst-matrix-example/gst-matrix-example.c
@@ -0,0 +1,138 @@
+/* gstmatrix-example - test program for the GStreamer matrix element
+ *
+ * Copyright (C) 2013  Antonio Ospite <ospite@studenti.unina.it>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* FIXME: suppress warnings for deprecated API such as GValueArray
+ * with newer GLib versions (>= 2.31.0)
+ * 
+ * It is just not possible to switch to GArray yet because the python API in
+ * 1.2.0 still passes iterable properties as GValueArray */
+#define GLIB_DISABLE_DEPRECATION_WARNINGS
+#include <gst/gst.h>
+
+static gboolean on_message(GstBus *bus, GstMessage *message, gpointer user_data)
+{
+       GMainLoop *loop = (GMainLoop *)user_data;
+
+       switch (GST_MESSAGE_TYPE(message)) {
+       case GST_MESSAGE_ERROR:
+               g_error("Got ERROR");
+               g_main_loop_quit(loop);
+               break;
+       case GST_MESSAGE_WARNING:
+               g_warning("Got WARNING");
+               g_main_loop_quit(loop);
+               break;
+       case GST_MESSAGE_EOS:
+               g_main_loop_quit(loop);
+               break;
+       default:
+               break;
+       }
+
+       return TRUE;
+}
+
+static void set_matrix(GstElement *element)
+{
+       GValueArray *va;
+       GValue v = { 0, };
+       gdouble m[9];
+       guint i;
+
+       /* Initialize a 2D perspective matrix, you can use
+        * cvGetPerspectiveTransform() from OpenCV to build it
+        * from a quad-to-quad transformation */
+       m[0] = 1.9999999999999982;
+       m[1] = 0.8333333333333287;
+       m[2] = -399.99999999999926;
+       m[3] = 3.9968028886505525e-15;
+       m[4] = 1.9999999999999978;
+       m[5] = -8.277822871605139e-13;
+       m[6] = 2.428612866367518e-18;
+       m[7] = 0.0020833333333333294;
+       m[8] = 0.9999999999999996;
+
+       va = g_value_array_new(1);
+
+       g_value_init(&v, G_TYPE_DOUBLE);
+       for (i = 0; i < 9; i++) {
+               g_value_set_double(&v, m[i]);
+               g_value_array_append(va, &v);
+               g_value_reset(&v);
+       }
+       g_object_set(G_OBJECT(element), "m", va, NULL);
+       g_value_array_free(va);
+}
+
+int main(void)
+{
+       GstElement *pipeline, *src, *capsfilter, *matrix, *conv, *sink;
+       GstCaps *caps;
+       GstBus *bus;
+       GMainLoop *loop;
+       int ret;
+
+       gst_init(NULL, NULL);
+
+       pipeline = gst_element_factory_make("pipeline", NULL);
+
+       src = gst_element_factory_make("videotestsrc", NULL);
+
+       caps = gst_caps_from_string("video/x-raw,format=AYUV,width=800,height=480");
+
+       capsfilter = gst_element_factory_make("capsfilter", NULL);
+       g_object_set(G_OBJECT(capsfilter), "caps", caps, NULL);
+
+       matrix = gst_element_factory_make("matrix", NULL);
+       set_matrix(matrix);
+
+       conv = gst_element_factory_make("videoconvert", NULL);
+
+       sink = gst_element_factory_make("autovideosink", NULL);
+       g_return_val_if_fail(sink != NULL, -1);
+
+       gst_bin_add_many(GST_BIN(pipeline), src, capsfilter, matrix, conv, sink, NULL);
+       ret = gst_element_link_many(src, capsfilter, matrix, conv, sink, NULL);
+       if (!ret) {
+               g_error("Failed to link elements");
+               return -2;
+       }
+
+       loop = g_main_loop_new(NULL, FALSE);
+
+       bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline));
+       gst_bus_add_signal_watch(bus);
+       g_signal_connect(G_OBJECT(bus), "message", G_CALLBACK(on_message),
+                        loop);
+       gst_object_unref(GST_OBJECT(bus));
+
+       ret = gst_element_set_state(pipeline, GST_STATE_PLAYING);
+       if (ret == GST_STATE_CHANGE_FAILURE) {
+               g_error("Failed to go into PLAYING state");
+               return -3;
+       }
+
+       g_main_loop_run(loop);
+
+       gst_element_set_state(pipeline, GST_STATE_NULL);
+
+       g_main_loop_unref(loop);
+       gst_object_unref(pipeline);
+
+       return 0;
+}