video: have a generic context struct for hwdec backends

Before this commit, each hw backend had their own specific struct types
for context, and some, like VDA, had none at all. Add a context struct
(mp_hwdec_ctx) that provides a somewhat generic way to pass the hwdec
context around. Some things get slightly better, some slightly more
verbose.

mp_hwdec_info is still around; it's still needed, but is reduced to its
role of handling delayed loading of the hwdec backend.

1 files changed, 2 insertions, 0 deletions

diff --git a/video/vaapi.h b/video/vaapi.h
index 8a6ba766e5..98e21d579b 100644
--- a/video/vaapi.h
+++ b/video/vaapi.h
@@ -72,11 +72,13 @@
     (const char[]){(fcc), (fcc) >> 8u, (fcc) >> 16u, (fcc) >> 24u, 0}
 
 #include "mp_image.h"
+#include "hwdec.h"
 
 struct mp_image_pool;
 struct mp_log;
 
 struct mp_vaapi_ctx {
+    struct mp_hwdec_ctx hwctx;
     struct mp_log *log;
     VADisplay display;
     struct va_image_formats *image_formats;