[FFmpeg-devel] [PATCH] avutils/hwcontext_qsv: set the source device in qsv_device_create

[Xu Guangxin]

opencl_device_derive only handles AV_HWDEVICE_TYPE_VAAPI.
We need a source device for qsv.

this will fix following pipeline:
ffmpeg -init_hw_device vaapi=intel:/dev/dri/renderD128 -init_hw_device opencl=ocl at intel -hwaccel qsv -c:v h264_qsv -hwaccel_output_format qsv -i $input -filter_hw_device ocl -vf 'hwmap=derive_device=opencl,format=opencl,unsharp_opencl,hwmap=derive_device=qsv:reverse=1:extra_hw_frames=32'  -c:v hevc_qsv  -y test.h265
---
 libavutil/hwcontext_qsv.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/libavutil/hwcontext_qsv.c b/libavutil/hwcontext_qsv.c
index 35a944f8f8..af3ee32cac 100644
--- a/libavutil/hwcontext_qsv.c
+++ b/libavutil/hwcontext_qsv.c
@@ -1269,7 +1269,13 @@ static int qsv_device_create(AVHWDeviceContext *ctx, const char *device,
 
     impl = choose_implementation(device);
 
-    return qsv_device_derive_from_child(ctx, impl, child_device, 0);
+    ret = qsv_device_derive_from_child(ctx, impl, child_device, 0);
+    if (ret == 0) {
+        ctx->internal->source_device = av_buffer_ref(priv->child_device_ctx);
+        if (!ctx->internal->source_device)
+            ret = AVERROR(ENOMEM);
+    }
+    return ret;
 }
 
 const HWContextType ff_hwcontext_type_qsv = {
-- 
2.25.1