docs: add doxygen (#1004)

src/config.h

@@ -17,39 +17,39 @@ struct video_t {
 
   int min_threads; // Minimum number of threads/slices for CPU encoding
   struct {
-    std::string preset;
-    std::string tune;
+    std::string sw_preset;
+    std::string sw_tune;
   } sw;
 
   struct {
-    std::optional<int> preset;
-    std::optional<int> tune;
-    std::optional<int> rc;
-    int coder;
+    std::optional<int> nv_preset;
+    std::optional<int> nv_tune;
+    std::optional<int> nv_rc;
+    int nv_coder;
   } nv;
 
   struct {
-    std::optional<int> preset;
-    std::optional<int> cavlc;
+    std::optional<int> qsv_preset;
+    std::optional<int> qsv_cavlc;
   } qsv;
 
   struct {
-    std::optional<int> quality_h264;
-    std::optional<int> quality_hevc;
-    std::optional<int> rc_h264;
-    std::optional<int> rc_hevc;
-    std::optional<int> usage_h264;
-    std::optional<int> usage_hevc;
-    std::optional<int> preanalysis;
-    std::optional<int> vbaq;
-    int coder;
+    std::optional<int> amd_quality_h264;
+    std::optional<int> amd_quality_hevc;
+    std::optional<int> amd_rc_h264;
+    std::optional<int> amd_rc_hevc;
+    std::optional<int> amd_usage_h264;
+    std::optional<int> amd_usage_hevc;
+    std::optional<int> amd_preanalysis;
+    std::optional<int> amd_vbaq;
+    int amd_coder;
   } amd;
 
   struct {
-    int allow_sw;
-    int require_sw;
-    int realtime;
-    int coder;
+    int vt_allow_sw;
+    int vt_require_sw;
+    int vt_realtime;
+    int vt_coder;
   } vt;
 
   std::string encoder;