[FFmpeg-cvslog] lavc/d3d12va: Improve behaviour on missing decoder support

[Mark Thompson]

ffmpeg | branch: master | Mark Thompson <sw at jkqxz.net> | Sun Feb  4 13:24:33 2024 +0000| [fa580a0f17f72a54a2effe89bf10b00b28203d87] | committer: Mark Thompson

lavc/d3d12va: Improve behaviour on missing decoder support

Distinguish between a decoder being entirely missing and a decoder which
requires features which are not present in the incomplete implementation
in libavcodec and therefore can't be used.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fa580a0f17f72a54a2effe89bf10b00b28203d87
---

 libavcodec/d3d12va_decode.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/libavcodec/d3d12va_decode.c b/libavcodec/d3d12va_decode.c
index f678b6f483..9bb8db1690 100644
--- a/libavcodec/d3d12va_decode.c
+++ b/libavcodec/d3d12va_decode.c
@@ -239,10 +239,14 @@ static int d3d12va_create_decoder(AVCodecContext *avctx)
 
     DX_CHECK(ID3D12VideoDevice_CheckFeatureSupport(device_hwctx->video_device, D3D12_FEATURE_VIDEO_DECODE_SUPPORT,
                                                    &feature, sizeof(feature)));
-    if (!(feature.SupportFlags & D3D12_VIDEO_DECODE_SUPPORT_FLAG_SUPPORTED) ||
-        !(feature.DecodeTier >= D3D12_VIDEO_DECODE_TIER_2)) {
-        av_log(avctx, AV_LOG_ERROR, "D3D12 decoder doesn't support on this device\n");
-        return AVERROR(EINVAL);
+    if (!(feature.SupportFlags & D3D12_VIDEO_DECODE_SUPPORT_FLAG_SUPPORTED)) {
+        av_log(avctx, AV_LOG_ERROR, "D3D12 video decode is not supported on this device.\n");
+        return AVERROR(ENOSYS);
+    }
+    if (!(feature.DecodeTier >= D3D12_VIDEO_DECODE_TIER_2)) {
+        av_log(avctx, AV_LOG_ERROR, "D3D12 video decode on this device requires tier %d support, "
+               "but it is not implemented.\n", feature.DecodeTier);
+        return AVERROR_PATCHWELCOME;
     }
 
     desc = (D3D12_VIDEO_DECODER_DESC) {