libavutil/hwcontext_qsv: add usage child_device_type argument to explicitly select d3d11va/DX11 device type

UPD: Rebase of last patch set over current master and use DX9 as default device type.

Makes selection of dxva2/DX9 device type by default as before with explicit d3d11va/DX11 usage to cover more HW configurations.
Added warning message to expect changing default device type in the future.

Fixes TGL / AV1 decode as requires DX11 with explicit DX11 type
selection.

Add headless/multi adapter support and fixes:
    https://trac.ffmpeg.org/ticket/7511
    https://trac.ffmpeg.org/ticket/6827
    http://ffmpeg.org/pipermail/ffmpeg-trac/2017-November/041901.html
    https://trac.ffmpeg.org/ticket/7933
    https://github.com/InitialForce/FFmpeg/commit/338fbcd5bba1de0e1b3e3bad8985eee2fdfbeca1
    https://github.com/jellyfin/jellyfin/issues/2626#issuecomment-602153952

Any other fixes are welcome including OpenCL interop patch since I don't have proper setup to validate this use case

Decoding, encoding, transcoding have been validated.

child_device_type option is responsible for d3d11va/dxva2 device selection

Usage examples:

DirectX 11:
    -init_hw_device qsv:hw,child_device_type=d3d11va
    -init_hw_device qsv:hw,child_device_type=d3d11va,child_device=0
OR
    -init_hw_device d3d11va=dx -init_hw_device qsv@dx

DirectX 9 is still supported but requires explicit selection:
    -init_hw_device qsv:hw,child_device_type=dxva2
OR
    -init_hw_device dxva2=dx -init_hw_device qsv@dx

Signed-off-by: Artem Galin <artem.galin@intel.com>

1 files changed, 49 insertions, 13 deletions

diff --git a/libavutil/hwcontext_qsv.c b/libavutil/hwcontext_qsv.c
index 0ca805e277..77b540fef9 100644
--- a/libavutil/hwcontext_qsv.c
+++ b/libavutil/hwcontext_qsv.c
@@ -1443,25 +1443,61 @@ static int qsv_device_create(AVHWDeviceContext *ctx, const char *device,
     ctx->user_opaque = priv;
     ctx->free        = qsv_device_free;
 
-    e = av_dict_get(opts, "child_device", NULL, 0);
-
-    child_device_opts = NULL;
-    if (CONFIG_VAAPI) {
+    e = av_dict_get(opts, "child_device_type", NULL, 0);
+    if (e) {
+        child_device_type = av_hwdevice_find_type_by_name(e ? e->value : NULL);
+        if (child_device_type == AV_HWDEVICE_TYPE_NONE) {
+            av_log(ctx, AV_LOG_ERROR, "Unknown child device type "
+                   "\"%s\".\n", e ? e->value : NULL);
+            return AVERROR(EINVAL);
+        }
+    } else if (CONFIG_VAAPI) {
         child_device_type = AV_HWDEVICE_TYPE_VAAPI;
-        // libmfx does not actually implement VAAPI properly, rather it
-        // depends on the specific behaviour of a matching iHD driver when
-        // used on recent Intel hardware.  Set options to the VAAPI device
-        // creation so that we should pick a usable setup by default if
-        // possible, even when multiple devices and drivers are available.
-        av_dict_set(&child_device_opts, "kernel_driver", "i915", 0);
-        av_dict_set(&child_device_opts, "driver",        "iHD",  0);
-    } else if (CONFIG_DXVA2)
+    } else if (CONFIG_DXVA2) {
+        av_log(NULL, AV_LOG_WARNING,
+                "WARNING: defaulting child_device_type to AV_HWDEVICE_TYPE_DXVA2 for compatibility "
+                "with old commandlines. This behaviour will be removed "
+                "in the future. Please explicitly set device type via \"-init_hw_device\" option.\n");
         child_device_type = AV_HWDEVICE_TYPE_DXVA2;
-    else {
+    } else if (CONFIG_D3D11VA) {
+        child_device_type = AV_HWDEVICE_TYPE_D3D11VA;
+    } else {
         av_log(ctx, AV_LOG_ERROR, "No supported child device type is enabled\n");
         return AVERROR(ENOSYS);
     }
 
+    child_device_opts = NULL;
+    switch (child_device_type) {
+#if CONFIG_VAAPI
+    case AV_HWDEVICE_TYPE_VAAPI:
+        {
+            // libmfx does not actually implement VAAPI properly, rather it
+            // depends on the specific behaviour of a matching iHD driver when
+            // used on recent Intel hardware.  Set options to the VAAPI device
+            // creation so that we should pick a usable setup by default if
+            // possible, even when multiple devices and drivers are available.
+            av_dict_set(&child_device_opts, "kernel_driver", "i915", 0);
+            av_dict_set(&child_device_opts, "driver",        "iHD",  0);
+        }
+        break;
+#endif
+#if CONFIG_D3D11VA
+    case AV_HWDEVICE_TYPE_D3D11VA:
+        break;
+#endif
+#if CONFIG_DXVA2
+    case AV_HWDEVICE_TYPE_DXVA2:
+        break;
+#endif
+    default:
+        {
+            av_log(ctx, AV_LOG_ERROR, "No supported child device type is enabled\n");
+            return AVERROR(ENOSYS);
+        }
+        break;
+    }
+
+    e = av_dict_get(opts, "child_device", NULL, 0);
     ret = av_hwdevice_ctx_create(&priv->child_device_ctx, child_device_type,
                                  e ? e->value : NULL, child_device_opts, 0);