feat: basic-tutorial-6 finish

CMakeLists.txt

@@ -8,7 +8,8 @@ include_directories(/usr/lib/aarch64-linux-gnu/glib-2.0/include)
 
 # add_executable(${PROJECT_NAME} basic-tutorial-1.c)
 # add_executable(${PROJECT_NAME} basic-tutorial-2.c)
-add_executable(${PROJECT_NAME} basic-tutorial-3.c)
+# add_executable(${PROJECT_NAME} basic-tutorial-3.c)
+add_executable(${PROJECT_NAME} basic-tutorial-6.c)
 
 target_link_libraries(${PROJECT_NAME} 
 gstreamer-1.0

basic-tutorial-6.c

@@ -0,0 +1,217 @@
+#include <gst/gst.h>
+
+static gboolean print_field (GQuark field,const GValue *value, gpointer pfx)
+{
+    gchar *str = gst_value_serialize (value);
+    g_print("%s %15s: %s\n",(gchar *)pfx, g_quark_to_string(field),str);
+    g_free(str);
+    return TRUE;
+}
+
+static void print_caps (const GstCaps *caps, const gchar *pfx)
+{
+    guint i;
+    g_return_if_fail (caps != NULL);
+
+    if(gst_caps_is_any(caps))
+    {
+        g_print("%sANY\n",pfx);
+        return;
+    }
+    if(gst_caps_is_empty(caps))
+    {
+        g_print("%sEMPTY\n",pfx);
+        return;
+    }
+
+    for( i = 0; i < gst_caps_get_size(caps);i++)
+    {
+        GstStructure *structure = gst_caps_get_structure(caps,i);
+
+        g_print("%s%s\n",pfx,gst_structure_get_name(structure));
+        gst_structure_foreach(structure,print_field,(gpointer)pfx);
+    }
+}
+
+static void print_pad_templates_information (GstElementFactory *factory)
+{
+    const GList *pads;
+    GstStaticPadTemplate *padtemplate;
+
+    g_print("Pad Templates for %s:\n",gst_element_factory_get_longname(factory));
+    if(!gst_element_factory_get_num_pad_templates(factory))
+    {
+        g_print(" none\n");
+        return;
+    }
+
+    pads = gst_element_factory_get_static_pad_templates(factory);
+    while(pads)
+    {
+        padtemplate = pads->data;
+        pads = g_list_next(pads);
+        if(padtemplate->direction == GST_PAD_SRC)
+        {
+            g_print("SRC template: '%s'\n",padtemplate->name_template);
+        }
+        else if(padtemplate->direction == GST_PAD_SINK)
+        {
+            g_print("SINK template: '%s'\n",padtemplate->name_template);
+        }
+        else
+        {
+            g_print("UNKNOWN!! template: '%s'\n",padtemplate->name_template);
+        }
+
+        if(padtemplate->presence == GST_PAD_ALWAYS)
+        {
+            g_print(" Availability: Always\n");
+        }
+        else if(padtemplate->presence == GST_PAD_SOMETIMES)
+        {
+            g_print(" Availability: Sometimes\n");
+        }
+        else if(padtemplate->presence == GST_PAD_REQUEST)
+        {
+            g_print(" Availability: On request\n");
+        }
+        else
+        {
+            g_print(" Availability: UNKNOWN!!!\n");
+        }
+
+        if(padtemplate->static_caps.string)
+        {
+            GstCaps *caps;
+            g_print(" Capabilities: \n");
+            caps = gst_static_caps_get(&padtemplate->static_caps);
+            print_caps(caps, " ");
+            gst_caps_unref(caps);
+        }
+        g_print("\n");
+    }
+}
+
+static void print_pad_capabilities(GstElement *element, gchar *pad_name)
+{
+    GstPad *pad = NULL;
+    GstCaps *caps = NULL;
+
+    pad = gst_element_get_static_pad(element, pad_name);
+    if(!pad)
+    {
+        g_printerr("Could not retrieve pad '%s'\n",pad_name);
+        return;
+    }
+
+    caps = gst_pad_get_current_caps(pad);
+    if(!caps)
+    {
+        caps = gst_pad_query_caps(pad,NULL);
+
+        g_print("Caps for the %s pad:\n",pad_name);
+        print_caps(caps," ");
+        gst_caps_unref(caps);
+        gst_object_unref(pad);
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    GstElement *pipeline, *source, *sink;
+    GstElementFactory *source_factory,*sink_factory;
+    GstBus *bus;
+    GstMessage *msg;
+    GstStateChangeReturn ret;
+    gboolean terminate = FALSE;
+
+    gst_init(&argc,&argv);
+
+    source_factory = gst_element_factory_find("audiotestsrc");
+    sink_factory = gst_element_factory_find("autoaudiosink");
+    if(!source_factory || !sink_factory)
+    {
+        g_printerr("Not all element fatories could be created.\n");
+        return -1;
+    }
+
+    print_pad_templates_information(source_factory);
+    print_pad_templates_information(sink_factory);
+
+    source = gst_element_factory_create(source_factory,"source");
+    sink = gst_element_factory_create(sink_factory,"sink");
+
+    pipeline = gst_pipeline_new("test-pipeline");
+
+    if(!pipeline || !source || !sink)
+    {
+        g_printerr("Not all element could be created!\n");
+        return -1;
+    }
+
+    gst_bin_add_many(GST_BIN(pipeline),source,sink,NULL);
+    if(gst_element_link(source,sink)!=TRUE)
+    {
+        g_printerr("Elements could not be linked!\n");
+        g_object_unref(pipeline);
+        return -1;
+    }
+
+    g_print("In NULL state:\n");
+    print_pad_capabilities(sink,"sink");
+
+    ret = gst_element_set_state(pipeline,GST_STATE_PLAYING);
+    if(ret == GST_STATE_CHANGE_FAILURE)
+    {
+        g_printerr("Unable to set the pipeline to the playing state (check the bus for error message).\n");
+    }
+
+    bus = gst_element_get_bus(pipeline);
+    do
+    {
+        msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE, GST_MESSAGE_ERROR | GST_MESSAGE_EOS |GST_MESSAGE_STATE_CHANGED);
+
+        if(msg != NULL)
+        {
+            GError *err;
+            gchar *debug_info;
+
+            switch (GST_MESSAGE_TYPE (msg))
+            {
+                case GST_MESSAGE_ERROR:
+                    gst_message_parse_error(msg, &err, &debug_info);
+                    g_printerr("Error received from element %s: %s\n",GST_OBJECT_NAME(msg->src),err->message);
+                    g_printerr("Debugging information: %s\n",debug_info ? debug_info : "none");
+                    g_clear_error(&err);
+                    g_free(debug_info);
+                    terminate = TRUE;
+                break;
+                case GST_MESSAGE_EOS:
+                    g_print("End-Of-Stream reached.\n");
+                    terminate = TRUE;
+                break;
+                case GST_MESSAGE_STATE_CHANGED:
+                    if(GST_MESSAGE_SRC(msg) == GST_OBJECT(pipeline))
+                    {
+                        GstState old_state,new_state,pending_state;
+                        gst_message_parse_state_changed(msg,&old_state,&new_state,&pending_state);
+                        g_print("\nPipeline state changed from %s to %s:\n",
+                            gst_element_state_get_name(old_state),gst_element_state_get_name(new_state));
+                        print_pad_capabilities(sink,"sink");
+                    }
+                break;
+                default:
+                    g_printerr("Unexpected message received.\n");
+                break;
+            }
+            gst_message_unref(msg);
+        }
+    }while(!terminate);
+
+    gst_object_unref(bus);
+    gst_element_set_state(pipeline,GST_STATE_NULL);
+    gst_object_unref(pipeline);
+    gst_object_unref(source_factory);
+    gst_object_unref(sink_factory);
+    return;
+}

build/Makefile

@@ -123,32 +123,32 @@ BasicTutorial/fast:
 	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/build
 .PHONY : BasicTutorial/fast
 
-basic-tutorial-3.o: basic-tutorial-3.c.o
+basic-tutorial-6.o: basic-tutorial-6.c.o
 
-.PHONY : basic-tutorial-3.o
+.PHONY : basic-tutorial-6.o
 
 # target to build an object file
-basic-tutorial-3.c.o:
+basic-tutorial-6.c.o:
-	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-3.c.o
+	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-6.c.o
-.PHONY : basic-tutorial-3.c.o
+.PHONY : basic-tutorial-6.c.o
 
-basic-tutorial-3.i: basic-tutorial-3.c.i
+basic-tutorial-6.i: basic-tutorial-6.c.i
 
-.PHONY : basic-tutorial-3.i
+.PHONY : basic-tutorial-6.i
 
 # target to preprocess a source file
-basic-tutorial-3.c.i:
+basic-tutorial-6.c.i:
-	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-3.c.i
+	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-6.c.i
-.PHONY : basic-tutorial-3.c.i
+.PHONY : basic-tutorial-6.c.i
 
-basic-tutorial-3.s: basic-tutorial-3.c.s
+basic-tutorial-6.s: basic-tutorial-6.c.s
 
-.PHONY : basic-tutorial-3.s
+.PHONY : basic-tutorial-6.s
 
 # target to generate assembly for a file
-basic-tutorial-3.c.s:
+basic-tutorial-6.c.s:
-	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-3.c.s
+	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-6.c.s
-.PHONY : basic-tutorial-3.c.s
+.PHONY : basic-tutorial-6.c.s
 
 # Help Target
 help:
@@ -159,9 +159,9 @@ help:
 	@echo "... rebuild_cache"
 	@echo "... edit_cache"
 	@echo "... BasicTutorial"
-	@echo "... basic-tutorial-3.o"
+	@echo "... basic-tutorial-6.o"
-	@echo "... basic-tutorial-3.i"
+	@echo "... basic-tutorial-6.i"
-	@echo "... basic-tutorial-3.s"
+	@echo "... basic-tutorial-6.s"
 .PHONY : help