fix: basic-tutorial-7.c works!

.vscode/launch.json

@@ -0,0 +1,7 @@
+{
+    // 使用 IntelliSense 了解相关属性。 
+    // 悬停以查看现有属性的描述。
+    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": []
+}

CMakeLists.txt

@@ -9,7 +9,8 @@ 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-6.c)
+# add_executable(${PROJECT_NAME} basic-tutorial-6.c)
+add_executable(${PROJECT_NAME} basic-tutorial-7.c)
 
 target_link_libraries(${PROJECT_NAME} 
 gstreamer-1.0

basic-tutorial-7.c

@@ -0,0 +1,85 @@
+#include <gst/gst.h>
+
+int main(int argc,char *argv[])
+{
+    GstElement *pipeline,*audio_source,*tee,*audio_queue,*audio_convert,*audio_resample,*audio_sink;
+    GstElement *video_queue,*visual,*video_convert,*video_sink;
+    GstBus *bus;
+    GstMessage *msg;
+    GstPad *tee_audio_pad, *tee_video_pad;
+    GstPad *queue_audio_pad,*queue_video_pad;
+
+    GstPadTemplate *tee_audio_pad_template,*tee_video_pad_template;
+
+    gst_init(&argc,&argv);
+
+    audio_source = gst_element_factory_make("audiotestsrc","audio_source");
+    tee = gst_element_factory_make("tee","tee");
+    audio_queue = gst_element_factory_make("queue","audio_queue");
+    audio_convert = gst_element_factory_make("audioconvert","audio_convert");
+    audio_resample = gst_element_factory_make("audioresample","Audio_resample");
+    audio_sink = gst_element_factory_make("autoaudiosink","audio_sink");
+    video_queue = gst_element_factory_make("queue","vide_queue");
+    visual = gst_element_factory_make("wavescope","visual");
+    video_convert = gst_element_factory_make("videoconvert","csp");
+    video_sink = gst_element_factory_make("autovideosink","video_sink");
+
+    pipeline = gst_pipeline_new("test-pipeline");
+
+    if( !pipeline ||!audio_source || !tee|| !audio_queue || !audio_convert || !audio_resample || !audio_sink ||
+        !video_queue || !visual || !video_convert || !video_sink)
+    {
+        g_printerr("Not all elements could be created.\n");
+        return -1;
+    }
+
+    g_object_set(audio_source,"freq",215.0f,NULL);
+    g_object_set(visual,"shader",0,"style",1,NULL);
+
+    gst_bin_add_many(GST_BIN(pipeline),audio_source,tee,audio_queue,audio_convert,audio_resample,
+        audio_sink,video_queue,visual,video_convert,video_sink,NULL);
+    if(gst_element_link_many(audio_source,tee,NULL)!= TRUE || 
+        gst_element_link_many(audio_queue,audio_convert,audio_resample,audio_sink,NULL) != TRUE ||
+        gst_element_link_many(video_queue,visual,video_convert,video_sink,NULL) != TRUE )
+    {
+        g_printerr("Elements could not be linked.\n");
+        g_object_unref(pipeline);
+        return -1;
+    }
+    
+    // tee_audio_pad_template = gst_element_class_get_pad_template(GST_ELEMENT_GET_CLASS(tee),"src%d");
+    tee_audio_pad = gst_element_get_request_pad(tee,"src_%u");
+    g_print("Obtained request pad %s for audio branch.\n",gst_pad_get_name(tee_audio_pad));
+    // tee_video_pad_template = gst_element_class_get_pad_template(GST_ELEMENT_CLASS(tee),"src%d");
+    queue_audio_pad = gst_element_get_static_pad(audio_queue,"sink");
+    tee_video_pad = gst_element_get_request_pad(tee,"src_%u");
+    g_print("Obtained request pad %s for video branch",gst_pad_get_name(tee_video_pad));
+    queue_video_pad = gst_element_get_static_pad(video_queue,"sink");
+    if(gst_pad_link(tee_audio_pad,queue_audio_pad) != GST_PAD_LINK_OK || 
+    gst_pad_link(tee_video_pad,queue_video_pad) != GST_PAD_LINK_OK)
+    {
+        g_printerr("Tee could not be linked!\n");
+        return -1;
+    }
+
+    gst_object_unref(queue_audio_pad);
+    gst_object_unref(queue_video_pad);
+
+    gst_element_set_state(pipeline,GST_STATE_PLAYING);
+
+    bus = gst_element_get_bus(pipeline);
+    msg = gst_bus_timed_pop_filtered(bus, GST_CLOCK_TIME_NONE,GST_MESSAGE_ERROR | GST_MESSAGE_EOS);
+
+    gst_element_release_request_pad(tee,tee_audio_pad);
+    gst_element_release_request_pad(tee,tee_video_pad);
+    gst_object_unref(tee_audio_pad);
+    gst_object_unref(tee_video_pad);
+
+    if(msg != NULL)
+    gst_message_unref(msg);
+    gst_object_unref(bus);
+    gst_element_set_state(pipeline,GST_STATE_NULL);
+
+    gst_object_unref(pipeline);
+    return 0;
+}

build/Makefile

@@ -123,32 +123,32 @@ BasicTutorial/fast:
 	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/build
 .PHONY : BasicTutorial/fast
 
-basic-tutorial-6.o: basic-tutorial-6.c.o
+basic-tutorial-7.o: basic-tutorial-7.c.o
 
-.PHONY : basic-tutorial-6.o
+.PHONY : basic-tutorial-7.o
 
 # target to build an object file
-basic-tutorial-6.c.o:
+basic-tutorial-7.c.o:
-	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-6.c.o
+	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-7.c.o
-.PHONY : basic-tutorial-6.c.o
+.PHONY : basic-tutorial-7.c.o
 
-basic-tutorial-6.i: basic-tutorial-6.c.i
+basic-tutorial-7.i: basic-tutorial-7.c.i
 
-.PHONY : basic-tutorial-6.i
+.PHONY : basic-tutorial-7.i
 
 # target to preprocess a source file
-basic-tutorial-6.c.i:
+basic-tutorial-7.c.i:
-	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-6.c.i
+	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-7.c.i
-.PHONY : basic-tutorial-6.c.i
+.PHONY : basic-tutorial-7.c.i
 
-basic-tutorial-6.s: basic-tutorial-6.c.s
+basic-tutorial-7.s: basic-tutorial-7.c.s
 
-.PHONY : basic-tutorial-6.s
+.PHONY : basic-tutorial-7.s
 
 # target to generate assembly for a file
-basic-tutorial-6.c.s:
+basic-tutorial-7.c.s:
-	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-6.c.s
+	$(MAKE) -f CMakeFiles/BasicTutorial.dir/build.make CMakeFiles/BasicTutorial.dir/basic-tutorial-7.c.s
-.PHONY : basic-tutorial-6.c.s
+.PHONY : basic-tutorial-7.c.s
 
 # Help Target
 help:
@@ -159,9 +159,9 @@ help:
 	@echo "... rebuild_cache"
 	@echo "... edit_cache"
 	@echo "... BasicTutorial"
-	@echo "... basic-tutorial-6.o"
+	@echo "... basic-tutorial-7.o"
-	@echo "... basic-tutorial-6.i"
+	@echo "... basic-tutorial-7.i"
-	@echo "... basic-tutorial-6.s"
+	@echo "... basic-tutorial-7.s"
 .PHONY : help