[Spice-devel] [PATCH spice-streaming-agent 4/4] gst-plugin: reduce number of templates being used

[Snir Sheriber]

---

This patch is not really necessary, just a suggestion, it's a bit hacky
but would save some code.
Other options would be to use explicit template specialization or to
leave it as is.

---
 src/gst-plugin.cpp | 44 ++++++++++++++------------------------------
 1 file changed, 14 insertions(+), 30 deletions(-)

diff --git a/src/gst-plugin.cpp b/src/gst-plugin.cpp
index c7412c5..5f4cc3d 100644
--- a/src/gst-plugin.cpp
+++ b/src/gst-plugin.cpp
@@ -49,32 +49,16 @@ struct GstObjectDeleter {
 template <typename T>
 using GstObjectUPtr = std::unique_ptr<T, GstObjectDeleter<T>>;
 
-struct GstCapsDeleter {
-    void operator()(GstCaps* p)
-    {
-        gst_caps_unref(p);
-    }
-};
-
-using GstCapsUPtr = std::unique_ptr<GstCaps, GstCapsDeleter>;
-
-struct GstSampleDeleter {
-    void operator()(GstSample* p)
-    {
-        gst_sample_unref(p);
-    }
-};
-
-using GstSampleUPtr = std::unique_ptr<GstSample, GstSampleDeleter>;
-
-struct GstBufferDeleter {
-    void operator()(GstBuffer* p)
+template <typename T>
+struct GstMiniObjectDeleter {
+    void operator()(T* p)
     {
-        gst_buffer_unref(p);
+        gst_mini_object_unref(GST_MINI_OBJECT_CAST(p));
     }
 };
 
-using GstBufferUPtr = std::unique_ptr<GstBuffer, GstBufferDeleter>;
+template <typename T>
+using GstMiniObjectUPtr = std::unique_ptr<T, GstMiniObjectDeleter<T>>;
 
 class GstreamerFrameCapture final : public FrameCapture
 {
@@ -89,7 +73,7 @@ public:
     std::vector<DeviceDisplayInfo> get_device_display_info() const override;
 private:
     void free_sample();
-    GstElement *get_encoder_plugin(const GstreamerEncoderSettings &settings, GstCapsUPtr &sink_caps);
+    GstElement *get_encoder_plugin(const GstreamerEncoderSettings &settings, GstMiniObjectUPtr<GstCaps> &sink_caps);
     GstElement *get_capture_plugin(const GstreamerEncoderSettings &settings);
     void pipeline_init(const GstreamerEncoderSettings &settings);
     Display *const dpy;
@@ -97,7 +81,7 @@ private:
     void xlib_capture();
 #endif
     GstObjectUPtr<GstElement> pipeline, capture, sink;
-    GstSampleUPtr sample;
+    GstMiniObjectUPtr<GstSample> sample;
     GstMapInfo map = {};
     uint32_t last_width = ~0u, last_height = ~0u;
     uint32_t cur_width = 0, cur_height = 0;
@@ -134,7 +118,7 @@ GstElement *GstreamerFrameCapture::get_capture_plugin(const GstreamerEncoderSett
 }
 
 GstElement *GstreamerFrameCapture::get_encoder_plugin(const GstreamerEncoderSettings &settings,
-                                                      GstCapsUPtr &sink_caps)
+                                                      GstMiniObjectUPtr<GstCaps> &sink_caps)
 {
     GList *encoders;
     GList *filtered;
@@ -238,7 +222,7 @@ void GstreamerFrameCapture::pipeline_init(const GstreamerEncoderSettings &settin
     if (!convert) {
         throw std::runtime_error("Gstreamer's 'autovideoconvert' element cannot be created");
     }
-    GstCapsUPtr sink_caps;
+    GstMiniObjectUPtr<GstCaps> sink_caps;
     GstObjectUPtr<GstElement> encoder(get_encoder_plugin(settings, sink_caps));
     if (!encoder) {
         throw std::runtime_error("Gstreamer's encoder element cannot be created");
@@ -260,7 +244,7 @@ void GstreamerFrameCapture::pipeline_init(const GstreamerEncoderSettings &settin
     gst_bin_add(bin, encoder);
     gst_bin_add(bin, sink);
 
-    GstCapsUPtr caps(gst_caps_from_string("video/x-raw(ANY)"));
+    GstMiniObjectUPtr<GstCaps> caps(gst_caps_from_string("video/x-raw(ANY)"));
     link = gst_element_link(capture.get(), convert.get()) &&
            gst_element_link_filtered(convert.get(), encoder.get(), caps.get()) &&
            gst_element_link_filtered(encoder.get(), sink.get(), sink_caps.get());
@@ -362,7 +346,7 @@ void GstreamerFrameCapture::xlib_capture()
         throw std::runtime_error("Cannot capture from X");
     }
 
-    GstBufferUPtr buf(gst_buffer_new_wrapped_full((GstMemoryFlags)0, image->data,
+    GstMiniObjectUPtr<GstBuffer> buf(gst_buffer_new_wrapped_full((GstMemoryFlags)0, image->data,
                                                   image->height * image->bytes_per_line, 0,
                                                   image->height * image->bytes_per_line, image,
                                                   free_ximage));
@@ -370,7 +354,7 @@ void GstreamerFrameCapture::xlib_capture()
         throw std::runtime_error("Failed to wrap image in gstreamer buffer");
     }
 
-    GstCapsUPtr caps(gst_caps_new_simple("video/x-raw",
+    GstMiniObjectUPtr<GstCaps> caps(gst_caps_new_simple("video/x-raw",
                                          "format", G_TYPE_STRING, "BGRx",
                                          "width", G_TYPE_INT, image->width,
                                          "height", G_TYPE_INT, image->height,
@@ -378,7 +362,7 @@ void GstreamerFrameCapture::xlib_capture()
                                          nullptr));
 
     // Push sample
-    GstSampleUPtr appsrc_sample(gst_sample_new(buf.get(), caps.get(), nullptr, nullptr));
+    GstMiniObjectUPtr<GstSample> appsrc_sample(gst_sample_new(buf.get(), caps.get(), nullptr, nullptr));
     if (gst_app_src_push_sample(GST_APP_SRC(capture.get()), appsrc_sample.get()) != GST_FLOW_OK) {
         throw std::runtime_error("gstramer appsrc element cannot push sample");
     }
-- 
2.21.0