This patch contains DXVA2 textures support implementation by AMF encoder (in 
addition of D3D11 textures)

Samples of usage:
DXVA2 decoder -> dxva2_vld texture -> AMF Encoder:
ffmpeg -hwaccel dxva2 -hwaccel_output_format dxva2_vld -extra_hw_frames 16 -i 
input.mp4 -an -c:v h264_amf out.mkv

D3D11va decoder -> d3d11 texture -> AMF Encoder:
ffmpeg -hwaccel d3d11va -hwaccel_output_format d3d11 -extra_hw_frames 16 -i 
input.mp4 -an -c:v h264_amf out.mkv

---
Sending updated patch (Fixes according Mark's review):
> > ---
>    ^
> (When adding commentary which isn't part of the commit message to an email 
> please place it after this line so that it doesn't end up in the commit 
> message.)
Done here, hopefully correctly

> >      { AV_PIX_FMT_D3D11,      AMF_SURFACE_NV12 },
> > +    { AV_PIX_FMT_DXVA2_VLD,  AMF_SURFACE_NV12 },
> 
> As with D3D11, this isn't necessarily true.  This was ignored before, but do 
> you have any plan for how P010 (and others?) will be handled here?
removed HW types from format map, and added logic reading pixel format from 
avctx->sw_pix_fmt in case if avctx->pix_fmt is HWACCEL type

> +static void get_dx9_device_from_devmgr(IDirect3DDeviceManager9 *devmgr, 
> IDirect3DDevice9 **device, void *avcl) {
> ...
> Might be cleaner using an error return rather than the null device?
Fixed

> Everything using D3D9 types needs to be inside CONFIG_DXVA2
Fixed

> Passing NULL here will make this case succeed in cases where it shouldn't, I 
> think?
Agree, fixed

> Tbh I don't think this fallback case should exist at all, it should just fail.
> Is there any use-case for having it?  The user passed a DXVA2 frames context 
> on a 
> non-AMD device and expects it to work with that hardware input, this fallback 
> makes 
> it kindof work with at least two copies in a way which is likely to be very 
> slow.  
> Even if the user does want to do that, it would be better for them to do it 
> explicitly 
> to ensure that they aware of the problem.  (We don't automatically do this in 
> any other case.)
Agree, fixed

> Spurious whitespace.
Fixed in changed blocks/functions

> Tested on Windows 7, works well.  
> Unlike with D3D11 the OpenCL interop works properly as well, 
> so e.g. -vf 'hwmap=derive_device=opencl,convolution_opencl=0 1 0 1 -4 1 0 1 
> 0,hwmap=derive_device=dxva2:reverse=1:extra_hw_frames=16' as encoder input 
> works too.
Could you send the samples (or link if they are published, I will add to my 
tests and will check OpenCL interop with D3D11)



 libavcodec/amfenc.c | 158 +++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 126 insertions(+), 32 deletions(-)

diff --git a/libavcodec/amfenc.c b/libavcodec/amfenc.c
index b9418b6791..7cdf17a972 100644
--- a/libavcodec/amfenc.c
+++ b/libavcodec/amfenc.c
@@ -24,6 +24,9 @@
 #if CONFIG_D3D11VA
 #include "libavutil/hwcontext_d3d11va.h"
 #endif
+#if CONFIG_DXVA2
+#include "libavutil/hwcontext_dxva2.h"
+#endif
 #include "libavutil/mem.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/time.h"
@@ -50,6 +53,9 @@ const enum AVPixelFormat ff_amf_pix_fmts[] = {
     AV_PIX_FMT_YUV420P,
 #if CONFIG_D3D11VA
     AV_PIX_FMT_D3D11,
+#endif
+#if CONFIG_DXVA2
+    AV_PIX_FMT_DXVA2_VLD,
 #endif
     AV_PIX_FMT_NONE
 };
@@ -68,7 +74,6 @@ static const FormatMap format_map[] =
     { AV_PIX_FMT_GRAY8,      AMF_SURFACE_GRAY8 },
     { AV_PIX_FMT_YUV420P,    AMF_SURFACE_YUV420P },
     { AV_PIX_FMT_YUYV422,    AMF_SURFACE_YUY2 },
-    { AV_PIX_FMT_D3D11,      AMF_SURFACE_NV12 },
 };
 
 
@@ -152,6 +157,26 @@ static int amf_load_library(AVCodecContext *avctx)
     return 0;
 }
 
+#if CONFIG_DXVA2
+static HRESULT get_dx9_device_from_devmgr(IDirect3DDeviceManager9 *devmgr, 
IDirect3DDevice9 **device, void *avcl)
+{
+    HRESULT hr;
+    HANDLE device_handle;
+
+    if (SUCCEEDED(hr = devmgr->lpVtbl->OpenDeviceHandle(devmgr, 
&device_handle))) {
+        if (SUCCEEDED(hr = devmgr->lpVtbl->LockDevice(devmgr, device_handle, 
device, FALSE))) {
+            devmgr->lpVtbl->UnlockDevice(devmgr, device_handle, FALSE);
+        } else {
+            av_log(avcl, AV_LOG_INFO, "Failed to lock device handle for 
Direct3D9 device: %lx.\n", (unsigned long)hr);
+        }
+        devmgr->lpVtbl->CloseDeviceHandle(devmgr, device_handle);
+    } else {
+        av_log(avcl, AV_LOG_INFO, "Failed to open device handle for Direct3D9 
device: %lx.\n", (unsigned long)hr);
+    }
+    return hr;
+}
+#endif
+
 static int amf_init_context(AVCodecContext *avctx)
 {
     AmfContext         *ctx = avctx->priv_data;
@@ -177,34 +202,61 @@ static int amf_init_context(AVCodecContext *avctx)
     res = ctx->factory->pVtbl->CreateContext(ctx->factory, &ctx->context);
     AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR_UNKNOWN, "CreateContext() 
failed with error %d\n", res);
     // try to reuse existing DX device
-#if CONFIG_D3D11VA
     if (avctx->hw_frames_ctx) {
-        AVHWFramesContext *device_ctx = 
(AVHWFramesContext*)avctx->hw_frames_ctx->data;
-        if (device_ctx->device_ctx->type == AV_HWDEVICE_TYPE_D3D11VA) {
-            if (amf_av_to_amf_format(device_ctx->sw_format) != 
AMF_SURFACE_UNKNOWN) {
-                if (device_ctx->device_ctx->hwctx) {
-                    AVD3D11VADeviceContext *device_d3d11 = 
(AVD3D11VADeviceContext *)device_ctx->device_ctx->hwctx;
+        AVHWFramesContext *frames_ctx = (AVHWFramesContext 
*)avctx->hw_frames_ctx->data;
+        if (amf_av_to_amf_format(frames_ctx->sw_format) != 
AMF_SURFACE_UNKNOWN) {
+            if (frames_ctx->device_ctx->hwctx) {
+#if CONFIG_D3D11VA
+                if (frames_ctx->device_ctx->type == AV_HWDEVICE_TYPE_D3D11VA) {
+                    AVD3D11VADeviceContext *device_d3d11 = 
(AVD3D11VADeviceContext *)frames_ctx->device_ctx->hwctx;
                     res = ctx->context->pVtbl->InitDX11(ctx->context, 
device_d3d11->device, AMF_DX11_1);
                     if (res == AMF_OK) {
                         ctx->hw_frames_ctx = 
av_buffer_ref(avctx->hw_frames_ctx);
                         if (!ctx->hw_frames_ctx) {
                             return AVERROR(ENOMEM);
                         }
-                        if (device_ctx->initial_pool_size > 0)
-                            ctx->hwsurfaces_in_queue_max = 
device_ctx->initial_pool_size - 1;
+                        if (frames_ctx->initial_pool_size > 0)
+                            ctx->hwsurfaces_in_queue_max = 
frames_ctx->initial_pool_size - 1;
                     } else {
-                        if(res == AMF_NOT_SUPPORTED)
-                            av_log(avctx, AV_LOG_INFO, "avctx->hw_frames_ctx 
has D3D11 device which doesn't have D3D11VA interface, switching to default\n");
+                        if (res == AMF_NOT_SUPPORTED)
+                            av_log(avctx, AV_LOG_INFO, "avctx->hw_frames_ctx 
has D3D11 device which doesn't have D3D11VA interface\n");
                         else
-                            av_log(avctx, AV_LOG_INFO, "avctx->hw_frames_ctx 
has non-AMD device, switching to default\n");
+                            av_log(avctx, AV_LOG_INFO, "avctx->hw_frames_ctx 
has non-AMD device\n");
+                        return AVERROR(ENODEV);
                     }
                 }
-            } else {
-                av_log(avctx, AV_LOG_INFO, "avctx->hw_frames_ctx has format 
not uspported by AMF, switching to default\n");
+#endif
+#if CONFIG_DXVA2
+                if (frames_ctx->device_ctx->type == AV_HWDEVICE_TYPE_DXVA2) {
+                    AVDXVA2DeviceContext *device_dxva2 = (AVDXVA2DeviceContext 
*)frames_ctx->device_ctx->hwctx;
+                    IDirect3DDevice9 *device_dx9 = NULL;
+                    
if(SUCCEEDED(get_dx9_device_from_devmgr(device_dxva2->devmgr, &device_dx9, 
avctx))) {
+                        res = ctx->context->pVtbl->InitDX9(ctx->context, 
device_dx9);
+                        device_dx9->lpVtbl->Release(device_dx9);
+                        if (res == AMF_OK) {
+                            ctx->hw_frames_ctx = 
av_buffer_ref(avctx->hw_frames_ctx);
+                            if (!ctx->hw_frames_ctx) {
+                                return AVERROR(ENOMEM);
+                            }
+                            if (frames_ctx->initial_pool_size > 0)
+                                ctx->hwsurfaces_in_queue_max = 
frames_ctx->initial_pool_size - 1;
+                        } else {
+                            if (res == AMF_NOT_SUPPORTED)
+                                av_log(avctx, AV_LOG_INFO, 
"avctx->hw_frames_ctx has D3D device which doesn't have DXVA2 interface\n");
+                            else
+                                av_log(avctx, AV_LOG_INFO, 
"avctx->hw_frames_ctx has non-AMD device\n");
+                            return AVERROR(ENODEV);
+                        }
+                    }
+                }
+#endif
             }
+        } else {
+            av_log(avctx, AV_LOG_INFO, "avctx->hw_frames_ctx has format not 
uspported by AMF\n");
         }
     } else if (avctx->hw_device_ctx) {
-        AVHWDeviceContext *device_ctx = 
(AVHWDeviceContext*)(avctx->hw_device_ctx->data);
+        AVHWDeviceContext *device_ctx = (AVHWDeviceContext 
*)(avctx->hw_device_ctx->data);
+#if CONFIG_D3D11VA
         if (device_ctx->type == AV_HWDEVICE_TYPE_D3D11VA) {
             if (device_ctx->hwctx) {
                 AVD3D11VADeviceContext *device_d3d11 = (AVD3D11VADeviceContext 
*)device_ctx->hwctx;
@@ -216,19 +268,42 @@ static int amf_init_context(AVCodecContext *avctx)
                     }
                 } else {
                     if (res == AMF_NOT_SUPPORTED)
-                        av_log(avctx, AV_LOG_INFO, "avctx->hw_device_ctx has 
D3D11 device which doesn't have D3D11VA interface, switching to default\n");
+                        av_log(avctx, AV_LOG_INFO, "avctx->hw_device_ctx has 
D3D11 device which doesn't have D3D11VA interface\n");
                     else
-                        av_log(avctx, AV_LOG_INFO, "avctx->hw_device_ctx has 
non-AMD device, switching to default\n");
+                        av_log(avctx, AV_LOG_INFO, "avctx->hw_device_ctx has 
non-AMD device\n");
+                    return AVERROR(ENODEV);
+                }
+            }
+        }
+#endif        
+#if CONFIG_DXVA2
+        if (device_ctx->type == AV_HWDEVICE_TYPE_DXVA2) {
+            AVDXVA2DeviceContext *device_dxva2 = (AVDXVA2DeviceContext 
*)device_ctx->hwctx;
+            IDirect3DDevice9 *device_dx9 = NULL;
+            if(SUCCEEDED(get_dx9_device_from_devmgr(device_dxva2->devmgr, 
&device_dx9, avctx))) {
+                res = ctx->context->pVtbl->InitDX9(ctx->context, device_dx9);
+                device_dx9->lpVtbl->Release(device_dx9);
+                if (res == AMF_OK) {
+                    ctx->hw_device_ctx = av_buffer_ref(avctx->hw_device_ctx);
+                    if (!ctx->hw_device_ctx) {
+                        return AVERROR(ENOMEM);
+                    }
+                } else {
+                    if (res == AMF_NOT_SUPPORTED)
+                        av_log(avctx, AV_LOG_INFO, "avctx->hw_device_ctx has 
D3D device which doesn't have DXVA2 interface\n");
+                    else
+                        av_log(avctx, AV_LOG_INFO, "avctx->hw_device_ctx has 
non-AMD device\n");
+                    return AVERROR(ENODEV);
                 }
             }
         }
-    }
 #endif
+    }
     if (!ctx->hw_frames_ctx && !ctx->hw_device_ctx) {
         res = ctx->context->pVtbl->InitDX11(ctx->context, NULL, AMF_DX11_1);
         if (res != AMF_OK) {
             res = ctx->context->pVtbl->InitDX9(ctx->context, NULL);
-            AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR_UNKNOWN, 
"InitDX9() failed with error %d\n", res);
+            AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR(ENODEV), 
"InitDX9() failed with error %d\n", res);
         }
     }
     return 0;
@@ -239,6 +314,7 @@ static int amf_init_encoder(AVCodecContext *avctx)
     AmfContext          *ctx = avctx->priv_data;
     const wchar_t       *codec_id = NULL;
     AMF_RESULT           res = AMF_OK;
+    enum AVPixelFormat   pix_fmt;
 
     switch (avctx->codec->id) {
         case AV_CODEC_ID_H264:
@@ -252,8 +328,13 @@ static int amf_init_encoder(AVCodecContext *avctx)
     }
     AMF_RETURN_IF_FALSE(ctx, codec_id != NULL, AVERROR(EINVAL), "Codec %d is 
not supported\n", avctx->codec->id);
 
-    ctx->format = amf_av_to_amf_format(avctx->pix_fmt);
-    AMF_RETURN_IF_FALSE(ctx, ctx->format != AMF_SURFACE_UNKNOWN, 
AVERROR(EINVAL), "Format %d is not supported\n", avctx->pix_fmt);
+    if(is_hwaccel_pix_fmt(avctx->pix_fmt)) {
+        pix_fmt = avctx->sw_pix_fmt;
+    } else {
+        pix_fmt = avctx->pix_fmt;
+    }
+    ctx->format = amf_av_to_amf_format(pix_fmt);
+    AMF_RETURN_IF_FALSE(ctx, ctx->format != AMF_SURFACE_UNKNOWN, 
AVERROR(EINVAL), "Format %d is not supported\n", pix_fmt);
 
     res = ctx->factory->pVtbl->CreateComponent(ctx->factory, ctx->context, 
codec_id, &ctx->encoder);
     AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR_ENCODER_NOT_FOUND, 
"CreateComponent(%ls) failed with error %d\n", codec_id, res);
@@ -555,22 +636,35 @@ int ff_amf_send_frame(AVCodecContext *avctx, const 
AVFrame *frame)
             // check if the same hw_frames_ctx as used in initialization
             (ctx->hw_frames_ctx && frame->hw_frames_ctx->data == 
ctx->hw_frames_ctx->data) ||
             // check if the same hw_device_ctx as used in initialization
-            (ctx->hw_device_ctx && 
((AVHWFramesContext*)frame->hw_frames_ctx->data)->device_ctx ==
-            (AVHWDeviceContext*)ctx->hw_device_ctx->data)
+            (ctx->hw_device_ctx && ((AVHWFramesContext 
*)frame->hw_frames_ctx->data)->device_ctx ==
+            (AVHWDeviceContext *)ctx->hw_device_ctx->data)
         )) {
             AMFBuffer *frame_ref_storage_buffer;
-
 #if CONFIG_D3D11VA
-            static const GUID AMFTextureArrayIndexGUID = { 0x28115527, 0xe7c3, 
0x4b66, { 0x99, 0xd3, 0x4f, 0x2a, 0xe6, 0xb4, 0x7f, 0xaf } };
-            ID3D11Texture2D *texture = (ID3D11Texture2D*)frame->data[0]; // 
actual texture
-            int index = (int)(size_t)frame->data[1]; // index is a slice in 
texture array is - set to tell AMF which slice to use
-            texture->lpVtbl->SetPrivateData(texture, 
&AMFTextureArrayIndexGUID, sizeof(index), &index);
+            if (((AVHWFramesContext 
*)frame->hw_frames_ctx->data)->device_ctx->type == AV_HWDEVICE_TYPE_D3D11VA) {
+                static const GUID AMFTextureArrayIndexGUID = { 0x28115527, 
0xe7c3, 0x4b66, { 0x99, 0xd3, 0x4f, 0x2a, 0xe6, 0xb4, 0x7f, 0xaf } };
+
+                ID3D11Texture2D *texture = (ID3D11Texture2D *)frame->data[0]; 
// actual texture
+                int index = (int)(size_t)frame->data[1]; // index is a slice 
in texture array is - set to tell AMF which slice to use
+                texture->lpVtbl->SetPrivateData(texture, 
&AMFTextureArrayIndexGUID, sizeof(index), &index);
 
-            res = 
ctx->context->pVtbl->CreateSurfaceFromDX11Native(ctx->context, texture, 
&surface, NULL); // wrap to AMF surface
-            AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR(ENOMEM), 
"CreateSurfaceFromDX11Native() failed  with error %d\n", res);
+                res = 
ctx->context->pVtbl->CreateSurfaceFromDX11Native(ctx->context, texture, 
&surface, NULL); // wrap to AMF surface
+                AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR(ENOMEM), 
"CreateSurfaceFromDX11Native() failed  with error %d\n", res);
 
-            // input HW surfaces can be vertically aligned by 16; tell AMF the 
real size
-            surface->pVtbl->SetCrop(surface, 0, 0, frame->width, 
frame->height);
+                // input HW surfaces can be vertically aligned by 16; tell AMF 
the real size
+                surface->pVtbl->SetCrop(surface, 0, 0, frame->width, 
frame->height);
+            }
+#endif
+#if CONFIG_DXVA2
+            if (((AVHWFramesContext 
*)frame->hw_frames_ctx->data)->device_ctx->type == AV_HWDEVICE_TYPE_DXVA2) {
+                IDirect3DSurface9 *texture = (IDirect3DSurface9 
*)frame->data[3]; // actual texture
+
+                res = 
ctx->context->pVtbl->CreateSurfaceFromDX9Native(ctx->context, texture, 
&surface, NULL); // wrap to AMF surface
+                AMF_RETURN_IF_FALSE(ctx, res == AMF_OK, AVERROR(ENOMEM), 
"CreateSurfaceFromDX9Native() failed  with error %d\n", res);
+
+                // input HW surfaces can be vertically aligned by 16; tell AMF 
the real size
+                surface->pVtbl->SetCrop(surface, 0, 0, frame->width, 
frame->height);
+            }
 #endif
 
             frame_ref_storage_buffer = amf_create_buffer_with_frame_ref(frame, 
ctx->context);
-- 
2.16.2.windows.1

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