vd_lavc: make --hwdec=nvdec-copy actually work

This simply didn't work. Unlike cuda-copy, this is a true hwaccel, and
obviously we need to provide it a device.

Implement this in a relatively generic way, which can probably reused
directly by videotoolbox (not doing this yet because it would require
testing on OSX).

Like with cuda-copy, --cuda-decode-device is ignored. We might be able
to provide a more general way to select devices at some later point.

1 files changed, 4 insertions, 0 deletions

diff --git a/video/decode/lavc.h b/video/decode/lavc.h
index 6287dc8577..810d7e393c 100644
--- a/video/decode/lavc.h
+++ b/video/decode/lavc.h
@@ -87,6 +87,10 @@ 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 true, create a AVHWDeviceContext with default parameters. In this
+    // case, create_standalone_dev_type is set to a valid value.
+    bool create_standalone_dev;
+    enum AVHWDeviceType create_standalone_dev_type;
     // If not-0: the IMGFMT_ format that should be accepted in the libavcodec
     // get_format callback.
     int image_format;