moved half the gstreamer code to the main file

src/main.zig

@@ -3,6 +3,11 @@ const std = @import("std");
 const hlo = @cImport({
     @cInclude("hailort.h");
 });
+const gst = @cImport({ // glib-object for g_object_* functions
+    @cInclude("glib-object.h");
+    @cInclude("gst.h");
+    @cInclude("glib.h"); // and glib for other g_* functions
+});
 
 const Allocator = std.mem.Allocator;
 const assert = std.debug.assert;
@@ -12,6 +17,8 @@ const max_edge_layers = 32;
 
 
 pub fn main() !void {
+    // This allows me to utilize the same command line args and gstreamer
+    gst.gst_init(@ptrCast(&std.os.argv.len), @ptrCast(&std.os.argv.ptr));
 
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
@@ -82,8 +89,51 @@ pub fn main() !void {
 
     std.debug.print("Output vstreams initialized\n", .{});
 
-    std.debug.print("Output_vstream_size is: '{d}'\n", .{ output_vstream_size });
+
-    std.debug.print("Input_vstream_size is: '{d}'\n", .{ input_vstream_size });
+
+    std.debug.print("HailoRT init completed\nGstreamer Init starting", .{});
+
+    const source: ?*gst.GstElement = gst.gst_element_factory_make("videotestsrc", "source");
+    const sink: ?*gst.GstElement = gst.gst_element_factory_make("autovideosink", "sink");
+
+    const pipeline: ?*gst.GstElement = gst.gst_pipeline_new("test-pipeline");
+
+    if (source == null or sink == null or pipeline == null) {
+        std.debug.panic("Not all elements could be created!", .{});
+    }
+
+    // When you look into the GST_BIN macro that zig can't compile,
+    // it really is just this pointer cast with extra steps of verification
+    const bin: *gst.GstBin = @ptrCast(pipeline);
+
+
+    // Gstreamer gives a critical warning when using gst.gst_bin_add_many, but doesn't
+    // when calling each individually
+    _ = gst.gst_bin_add(bin, source);
+    _ = gst.gst_bin_add(bin, sink);
+
+    // the failure return code is -1 I believe
+    if (gst.gst_element_link(source, sink) < 0) {
+        gst.gst_object_unref(pipeline);
+        std.debug.panic("Elements could not be linked\n", .{});
+    }
+
+    // g_int is just i32. You can 
+    gst.g_object_set(source, "pattern", @as(i16, 0));
+
+    const ret = gst.gst_element_set_state(pipeline, gst.GST_STATE_PLAYING);
+    if (ret == gst.GST_STATE_CHANGE_FAILURE) {
+        gst.gst_object_unref(pipeline);
+        std.debug.panic("Could not start pipeline", .{});
+    }
+
+    const bus: *gst.GstBus = gst.gst_element_get_bus(pipeline);
+    const msg: *gst.GstMessage = gst.gst_bus_timed_pop_filtered( // This call holds until there is a valid message
+        bus,
+        gst.GST_CLOCK_TIME_NONE,
+        gst.GST_MESSAGE_ERROR | gst.GST_MESSAGE_EOS,
+    );
+