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, 4 insertions, 0 deletions

diff --git a/video/vaapi.c b/video/vaapi.c
index e7cd7591a1..13e78f0f31 100644
--- a/video/vaapi.c
+++ b/video/vaapi.c
@@ -122,6 +122,10 @@ struct mp_vaapi_ctx *va_initialize(VADisplay *display, struct mp_log *plog)
     *res = (struct mp_vaapi_ctx) {
         .log = talloc_steal(res, log),
         .display = display,
+        .hwctx = {
+            .priv = res,
+            .vaapi_ctx = res,
+        },
     };
     mpthread_mutex_init_recursive(&res->lock);