feat: basic-tutorial-6 finish

master
邱棚 2023-02-12 14:02:17 +00:00
parent 905ac7fb1e
commit 9768fa1cb4
3 changed files with 237 additions and 19 deletions

View File

@ -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

217
basic-tutorial-6.c Normal file
View File

@ -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;
}

View File

@ -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:
$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-3.c.o
.PHONY : basic-tutorial-3.c.o
basic-tutorial-6.c.o:
$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-6.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:
$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-3.c.i
.PHONY : basic-tutorial-3.c.i
basic-tutorial-6.c.i:
$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-6.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:
$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-3.c.s
.PHONY : basic-tutorial-3.c.s
basic-tutorial-6.c.s:
$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-6.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-3.i"
@echo "... basic-tutorial-3.s"
@echo "... basic-tutorial-6.o"
@echo "... basic-tutorial-6.i"
@echo "... basic-tutorial-6.s"
.PHONY : help