video: refactor how VO exports hwdec device handles

The main change is with video/hwdec.h. mp_hwdec_info is made opaque (and
renamed to mp_hwdec_devices). Its accessors are mainly thread-safe (or
documented where not), which makes the whole thing saner and cleaner. In
particular, thread-safety rules become less subtle and more obvious.

The new internal API makes it easier to support multiple OpenGL interop
backends. (Although this is not done yet, and it's not clear whether it
ever will.)

This also removes all the API-specific fields from mp_hwdec_ctx and
replaces them with a "ctx" field. For d3d in particular, we drop the
mp_d3d_ctx struct completely, and pass the interfaces directly.

Remove the emulation checks from vaapi.c and vdpau.c; they are
pointless, and the checks that matter are done on the VO layer.

The d3d hardware decoders might slightly change behavior: dxva2-copy
will not use the VO device anymore if the VO supports proper interop.
This pretty much assumes that any in such cases the VO will not use any
form of exclusive mode, which makes using the VO device in copy mode
unnecessary.

This is a big refactor. Some things may be untested and could be broken.

1 files changed, 5 insertions, 7 deletions

diff --git a/video/out/vo_vdpau.c b/video/out/vo_vdpau.c
index 1dc5dc3b36..15472b2189 100644
--- a/video/out/vo_vdpau.c
+++ b/video/out/vo_vdpau.c
@@ -71,7 +71,6 @@ struct vdpctx {
     struct vdp_functions              *vdp;
     VdpDevice                          vdp_device;
     uint64_t                           preemption_counter;
-    struct mp_hwdec_info               hwdec_info;
 
     struct m_color                     colorkey;
 
@@ -1028,6 +1027,9 @@ static void uninit(struct vo *vo)
 {
     struct vdpctx *vc = vo->priv;
 
+    hwdec_devices_remove(vo->hwdec_devs, &vc->mpvdp->hwctx);
+    hwdec_devices_destroy(vo->hwdec_devs);
+
     /* Destroy all vdpau objects */
     mp_vdpau_mixer_destroy(vc->video_mixer);
     destroy_vdpau_objects(vo);
@@ -1053,7 +1055,8 @@ static int preinit(struct vo *vo)
         return -1;
     }
 
-    vc->hwdec_info.hwctx = &vc->mpvdp->hwctx;
+    vo->hwdec_devs = hwdec_devices_create();
+    hwdec_devices_add(vo->hwdec_devs, &vc->mpvdp->hwctx);
 
     vc->video_mixer = mp_vdpau_mixer_create(vc->mpvdp, vo->log);
 
@@ -1117,11 +1120,6 @@ static int control(struct vo *vo, uint32_t request, void *data)
     check_preemption(vo);
 
     switch (request) {
-    case VOCTRL_GET_HWDEC_INFO: {
-        struct mp_hwdec_info **arg = data;
-        *arg = &vc->hwdec_info;
-        return true;
-    }
     case VOCTRL_GET_PANSCAN:
         return VO_TRUE;
     case VOCTRL_SET_PANSCAN: