vd_lavc: remove need for duplicated cuda GL interop backend

This is just a dumb consequence of HWDEC_ types somehow being part of
both decoder and VO. Obviously, the VO should only care about supporting
specific hardware surface types or providing specific device types, but
until they are separated, stupid unintuitive mismatches will occur.

2 files changed, 6 insertions, 2 deletions

diff --git a/video/decode/lavc.h b/video/decode/lavc.h
index 8383c0a67f..6287dc8577 100644
--- a/video/decode/lavc.h
+++ b/video/decode/lavc.h
@@ -85,6 +85,8 @@ typedef struct lavc_ctx {
 
 struct vd_lavc_hwdec {
     enum hwdec_type type;
+    // If non-0, get this hwdec type from the VO (for the AVHWDeviceContext).
+    enum hwdec_type interop_type;
     // If not-0: the IMGFMT_ format that should be accepted in the libavcodec
     // get_format callback.
     int image_format;
diff --git a/video/decode/vd_lavc.c b/video/decode/vd_lavc.c
index ecc9e89962..6422346d31 100644
--- a/video/decode/vd_lavc.c
+++ b/video/decode/vd_lavc.c
@@ -160,6 +160,7 @@ static const struct vd_lavc_hwdec mp_vd_lavc_rkmpp = {
 #if HAVE_CUDA_HWACCEL
 static const struct vd_lavc_hwdec mp_vd_lavc_nvdec = {
     .type = HWDEC_NVDEC,
+    .interop_type = HWDEC_CUDA,
     .image_format = IMGFMT_CUDA,
     .generic_hwaccel = true,
     .set_hwframes = true,
@@ -369,8 +370,9 @@ static struct mp_hwdec_ctx *hwdec_create_dev(struct dec_video *vd,
     if (hwdec->create_dev)
         return hwdec->create_dev(vd->global, vd->log, autoprobe);
     if (vd->hwdec_devs) {
-        hwdec_devices_request(vd->hwdec_devs, hwdec->type);
-        return hwdec_devices_get(vd->hwdec_devs, hwdec->type);
+        int type = hwdec->interop_type ? hwdec->interop_type : hwdec->type;
+        hwdec_devices_request(vd->hwdec_devs, type);
+        return hwdec_devices_get(vd->hwdec_devs, type);
     }
     return NULL;
 }