[FFmpeg-devel] [PATCH v2 1/2] avfilter: add scale_d3d11 filter

* [FFmpeg-devel] [PATCH v2 1/2] avfilter: add scale_d3d11 filter
@ 2025-06-24  7:47 Dash Santosh Sathyanarayanan
  2025-06-24  7:56 ` Hendrik Leppkes
  0 siblings, 1 reply; 3+ messages in thread
From: Dash Santosh Sathyanarayanan @ 2025-06-24  7:47 UTC (permalink / raw)
  To: FFmpeg development discussions and patches

[-- Attachment #1: Type: text/plain, Size: 22500 bytes --]

This commit introduces a new hardware-accelerated video filter, scale_d3d11,
which performs scaling and format conversion using Direct3D 11. The filter enables
efficient GPU-based scaling and pixel format conversion (p010 to nv12), reducing
CPU overhead and latency in video pipelines.

> +        if (frames_ctx->sw_format == AV_PIX_FMT_NV12) {
> +            frames_hwctx->BindFlags |= D3D11_BIND_VIDEO_ENCODER;
> +        }
> 
> The filter should be designed universally rather than expecting to be connected
> to something specific at its output. Whether or not the bind_encoder bind flag
> should be set, needs to be determined during negotiation of the output
> connection.

The above change is in dxva2.c, when the decoder output surface is passed directly
to supported encoder, it requires BIND_VIDEO_ENCODER flag to be set. This does not
affect any intermediate steps. A surface with encoder bindflags set can be used as
input for any supported filters as well (confirmed with the scale_d3d11 filter).

Rest of the comments have been handled.

Thanks,
Dash

---
 Changelog                     |   1 +
 libavcodec/dxva2.c            |   3 +
 libavfilter/Makefile          |   1 +
 libavfilter/allfilters.c      |   1 +
 libavfilter/vf_scale_d3d11.c  | 464 ++++++++++++++++++++++++++++++++++
 libavutil/hwcontext_d3d11va.c |  33 ++-
 6 files changed, 492 insertions(+), 11 deletions(-)
 create mode 100644 libavfilter/vf_scale_d3d11.c

diff --git a/Changelog b/Changelog
index 4217449438..56122ef555 100644
--- a/Changelog
+++ b/Changelog
@@ -18,6 +18,7 @@ version <next>:
 - APV encoding support through a libopenapv wrapper
 - VVC decoder supports all content of SCC (Screen Content Coding):
   IBC (Inter Block Copy), Palette Mode and ACT (Adaptive Color Transform
+- Add vf_scale_d3d11 filter
 
 
 version 7.1:
diff --git a/libavcodec/dxva2.c b/libavcodec/dxva2.c
index 22ecd5acaf..37dab6cd68 100644
--- a/libavcodec/dxva2.c
+++ b/libavcodec/dxva2.c
@@ -647,6 +647,9 @@ int ff_dxva2_common_frame_params(AVCodecContext *avctx,
         AVD3D11VAFramesContext *frames_hwctx = frames_ctx->hwctx;
 
         frames_hwctx->BindFlags |= D3D11_BIND_DECODER;
+        if (frames_ctx->sw_format == AV_PIX_FMT_NV12) {
+            frames_hwctx->BindFlags |= D3D11_BIND_VIDEO_ENCODER;
+        }
     }
 #endif
 
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 97f8f17272..95612d753d 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -462,6 +462,7 @@ OBJS-$(CONFIG_ROBERTS_OPENCL_FILTER)         += vf_convolution_opencl.o opencl.o
 OBJS-$(CONFIG_ROTATE_FILTER)                 += vf_rotate.o
 OBJS-$(CONFIG_SAB_FILTER)                    += vf_sab.o
 OBJS-$(CONFIG_SCALE_FILTER)                  += vf_scale.o scale_eval.o framesync.o
+OBJS-$(CONFIG_SCALE_D3D11_FILTER)            += vf_scale_d3d11.o scale_eval.o
 OBJS-$(CONFIG_SCALE_CUDA_FILTER)             += vf_scale_cuda.o scale_eval.o \
                                                 vf_scale_cuda.ptx.o cuda/load_helper.o
 OBJS-$(CONFIG_SCALE_NPP_FILTER)              += vf_scale_npp.o scale_eval.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 3bc045b28f..ec5e09494a 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -436,6 +436,7 @@ extern const FFFilter ff_vf_scale;
 extern const FFFilter ff_vf_vpp_amf;
 extern const FFFilter ff_vf_sr_amf;
 extern const FFFilter ff_vf_scale_cuda;
+extern const FFFilter ff_vf_scale_d3d11;
 extern const FFFilter ff_vf_scale_npp;
 extern const FFFilter ff_vf_scale_qsv;
 extern const FFFilter ff_vf_scale_vaapi;
diff --git a/libavfilter/vf_scale_d3d11.c b/libavfilter/vf_scale_d3d11.c
new file mode 100644
index 0000000000..0b7476dd15
--- /dev/null
+++ b/libavfilter/vf_scale_d3d11.c
@@ -0,0 +1,464 @@
+/*
+ * Copyright (C) 2025 MulticorewWare, Inc.
+ *
+ * Authors: Dash Santosh <dash.sathanatayanan@multicorewareinc.com>
+ *          Sachin <sachin.prakash@multicorewareinc.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "compat/w32dlfcn.h"
+
+#include "libavutil/hwcontext.h"
+#include "libavutil/hwcontext_d3d11va.h"
+
+#include "filters.h"
+#include "scale_eval.h"
+#include "video.h"
+
+typedef struct ScaleD3D11Context {
+    const AVClass *classCtx;
+    char *w_expr;
+    char *h_expr;
+    enum AVPixelFormat format;
+
+    ///< D3D11 objects
+    ID3D11Device *device;
+    ID3D11DeviceContext *context;
+    ID3D11VideoDevice *videoDevice;
+    ID3D11VideoProcessor *processor;
+    ID3D11VideoProcessorEnumerator *enumerator;
+    ID3D11VideoProcessorOutputView *outputView;
+    ID3D11VideoProcessorInputView *inputView;
+
+    ///< Buffer references
+    AVBufferRef *hw_device_ctx;
+    AVBufferRef *hw_frames_ctx_out;
+
+    ///< Dimensions and formats
+    int width, height;
+    int inputWidth, inputHeight;
+    DXGI_FORMAT input_format;
+    DXGI_FORMAT output_format;
+} ScaleD3D11Context;
+
+static av_cold int scale_d3d11_init(AVFilterContext *ctx) {
+    ///< all real work is done in config_props and filter_frame
+    return 0;
+}
+
+static void release_d3d11_resources(ScaleD3D11Context *s) {
+    if (s->outputView) {
+        s->outputView->lpVtbl->Release(s->outputView);
+        s->outputView = NULL;
+    }
+
+    if (s->processor) {
+        s->processor->lpVtbl->Release(s->processor);
+        s->processor = NULL;
+    }
+
+    if (s->enumerator) {
+        s->enumerator->lpVtbl->Release(s->enumerator);
+        s->enumerator = NULL;
+    }
+
+    if (s->videoDevice) {
+        s->videoDevice->lpVtbl->Release(s->videoDevice);
+        s->videoDevice = NULL;
+    }
+}
+
+static int scale_d3d11_configure_processor(ScaleD3D11Context *s, AVFilterContext *ctx) {
+    HRESULT hr;
+
+    switch (s->format) {
+        case AV_PIX_FMT_NV12:
+            s->output_format = DXGI_FORMAT_NV12;
+            break;
+        case AV_PIX_FMT_P010:
+            s->output_format = DXGI_FORMAT_P010;
+            break;
+        default:
+            av_log(ctx, AV_LOG_ERROR, "Invalid output format specified\n");
+            return AVERROR(EINVAL);
+    }
+
+    ///< Get D3D11 device and context from hardware device context
+    AVHWDeviceContext *hwctx = (AVHWDeviceContext *)s->hw_device_ctx->data;
+    AVD3D11VADeviceContext *d3d11_hwctx = (AVD3D11VADeviceContext *)hwctx->hwctx;
+    s->device = d3d11_hwctx->device;
+    s->context = d3d11_hwctx->device_context;
+
+    av_log(ctx, AV_LOG_VERBOSE, "Configuring D3D11 video processor: %dx%d -> %dx%d\n",
+           s->inputWidth, s->inputHeight, s->width, s->height);
+
+    ///< Define the video processor content description
+    D3D11_VIDEO_PROCESSOR_CONTENT_DESC contentDesc = {
+        .InputFrameFormat = D3D11_VIDEO_FRAME_FORMAT_PROGRESSIVE,
+        .InputWidth = s->inputWidth,
+        .InputHeight = s->inputHeight,
+        .OutputWidth = s->width,
+        .OutputHeight = s->height,
+        .Usage = D3D11_VIDEO_USAGE_PLAYBACK_NORMAL,
+    };
+
+    ///< Query video device interface
+    hr = s->device->lpVtbl->QueryInterface(s->device, &IID_ID3D11VideoDevice, (void **)&s->videoDevice);
+    if (FAILED(hr)) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to get D3D11 video device interface: HRESULT 0x%lX\n", hr);
+        return AVERROR_EXTERNAL;
+    }
+
+    ///< Create video processor enumerator
+    hr = s->videoDevice->lpVtbl->CreateVideoProcessorEnumerator(s->videoDevice, &contentDesc, &s->enumerator);
+    if (FAILED(hr)) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to create video processor enumerator: HRESULT 0x%lX\n", hr);
+        return AVERROR_EXTERNAL;
+    }
+
+    ///< Create the video processor
+    hr = s->videoDevice->lpVtbl->CreateVideoProcessor(s->videoDevice, s->enumerator, 0, &s->processor);
+    if (FAILED(hr)) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to create video processor: HRESULT 0x%lX\n", hr);
+        return AVERROR_EXTERNAL;
+    }
+
+    av_log(ctx, AV_LOG_VERBOSE, "D3D11 video processor successfully configured\n");
+    return 0;
+}
+
+static int scale_d3d11_filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    ScaleD3D11Context *s = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    ID3D11VideoProcessorInputView *inputView = NULL;
+    ID3D11VideoContext *videoContext = NULL;
+    AVFrame *out = NULL;
+    int ret = 0;
+    HRESULT hr;
+
+    ///< Validate input frame
+    if (!in) {
+        av_log(ctx, AV_LOG_ERROR, "Null input frame\n");
+        return AVERROR(EINVAL);
+    }
+
+    if (!in->hw_frames_ctx) {
+        av_log(ctx, AV_LOG_ERROR, "No hardware frames context in input frame\n");
+        av_frame_free(&in);
+        return AVERROR(EINVAL);
+    }
+
+    ///< Verify hardware device contexts
+    AVHWFramesContext *frames_ctx = (AVHWFramesContext *)in->hw_frames_ctx->data;
+
+    if (!s->hw_device_ctx) {
+        av_log(ctx, AV_LOG_ERROR, "Filter hardware device context is uninitialized\n");
+        av_frame_free(&in);
+        return AVERROR(EINVAL);
+    }
+
+    AVHWDeviceContext *input_device_ctx = (AVHWDeviceContext *)frames_ctx->device_ref->data;
+    AVHWDeviceContext *filter_device_ctx = (AVHWDeviceContext *)s->hw_device_ctx->data;
+
+    if (input_device_ctx->type != filter_device_ctx->type) {
+        av_log(ctx, AV_LOG_ERROR, "Mismatch between input and filter hardware device types\n");
+        av_frame_free(&in);
+        return AVERROR(EINVAL);
+    }
+
+    ///< Allocate output frame
+    out = av_frame_alloc();
+    if (!out) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to allocate output frame\n");
+        av_frame_free(&in);
+        return AVERROR(ENOMEM);
+    }
+
+    ret = av_hwframe_get_buffer(s->hw_frames_ctx_out, out, 0);
+    if (ret < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to get output frame from pool\n");
+        av_frame_free(&in);
+        av_frame_free(&out);
+        return ret;
+    }
+
+    ///< Configure the D3D11 video processor if not already configured
+    if (!s->processor) {
+        ///< Get info from input texture
+        D3D11_TEXTURE2D_DESC textureDesc;
+        ID3D11Texture2D *input_texture = (ID3D11Texture2D *)in->data[0];
+        input_texture->lpVtbl->GetDesc(input_texture, &textureDesc);
+
+        s->inputWidth = textureDesc.Width;
+        s->inputHeight = textureDesc.Height;
+        s->input_format = textureDesc.Format;
+
+        ret = scale_d3d11_configure_processor(s, ctx);
+        if (ret < 0) {
+            av_log(ctx, AV_LOG_ERROR, "Failed to configure processor\n");
+            av_frame_free(&in);
+            av_frame_free(&out);
+            return ret;
+        }
+    }
+
+    ///< Get input texture and prepare input view
+    ID3D11Texture2D *d3d11_texture = (ID3D11Texture2D *)in->data[0];
+    int subIdx = (int)(intptr_t)in->data[1];
+
+    D3D11_VIDEO_PROCESSOR_INPUT_VIEW_DESC inputViewDesc = {
+        .FourCC = s->input_format,
+        .ViewDimension = D3D11_VPIV_DIMENSION_TEXTURE2D,
+        .Texture2D.ArraySlice = subIdx
+    };
+
+    hr = s->videoDevice->lpVtbl->CreateVideoProcessorInputView(
+        s->videoDevice, (ID3D11Resource *)d3d11_texture, s->enumerator, &inputViewDesc, &inputView);
+    if (FAILED(hr)) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to create input view: HRESULT 0x%lX\n", hr);
+        av_frame_free(&in);
+        av_frame_free(&out);
+        return AVERROR_EXTERNAL;
+    }
+
+    ///< Create output view for current texture
+    ID3D11Texture2D *output_texture = (ID3D11Texture2D *)out->data[0];
+    D3D11_VIDEO_PROCESSOR_OUTPUT_VIEW_DESC outputViewDesc = {
+        .ViewDimension = D3D11_VPOV_DIMENSION_TEXTURE2D,
+        .Texture2D = { .MipSlice = 0 },
+    };
+
+    hr = s->videoDevice->lpVtbl->CreateVideoProcessorOutputView(
+        s->videoDevice, (ID3D11Resource *)output_texture, s->enumerator, &outputViewDesc, &s->outputView);
+    if (FAILED(hr)) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to create output view: HRESULT 0x%lX\n", hr);
+        av_frame_free(&in);
+        av_frame_free(&out);
+        return AVERROR_EXTERNAL;
+    }
+
+    ///< Set up processing stream
+    D3D11_VIDEO_PROCESSOR_STREAM stream = {
+        .Enable = TRUE,
+        .pInputSurface = inputView,
+        .OutputIndex = 0
+    };
+
+    ///< Get video context
+    hr = s->context->lpVtbl->QueryInterface(s->context, &IID_ID3D11VideoContext, (void **)&videoContext);
+    if (FAILED(hr)) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to get video context: HRESULT 0x%lX\n", hr);
+        inputView->lpVtbl->Release(inputView);
+        av_frame_free(&in);
+        av_frame_free(&out);
+        return AVERROR_EXTERNAL;
+    }
+
+    ///< Process the frame
+    hr = videoContext->lpVtbl->VideoProcessorBlt(videoContext, s->processor, s->outputView, 0, 1, &stream);
+    if (FAILED(hr)) {
+        av_log(ctx, AV_LOG_ERROR, "VideoProcessorBlt failed: HRESULT 0x%lX\n", hr);
+        videoContext->lpVtbl->Release(videoContext);
+        inputView->lpVtbl->Release(inputView);
+        av_frame_free(&in);
+        av_frame_free(&out);
+        return AVERROR_EXTERNAL;
+    }
+
+    ///< Set up output frame
+    ret = av_frame_copy_props(out, in);
+    if (ret < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to copy frame properties\n");
+        videoContext->lpVtbl->Release(videoContext);
+        inputView->lpVtbl->Release(inputView);
+        av_frame_free(&in);
+        av_frame_free(&out);
+        return ret;
+    }
+
+    out->data[0] = (uint8_t *)output_texture;
+    out->data[1] = (uint8_t *)(intptr_t)0;
+    out->width = s->width;
+    out->height = s->height;
+    out->format = AV_PIX_FMT_D3D11;
+
+    ///< Clean up resources
+    inputView->lpVtbl->Release(inputView);
+    videoContext->lpVtbl->Release(videoContext);
+    if (s->outputView) {
+        s->outputView->lpVtbl->Release(s->outputView);
+        s->outputView = NULL;
+    }
+    av_frame_free(&in);
+
+    ///< Forward the frame
+    return ff_filter_frame(outlink, out);
+}
+
+static int scale_d3d11_config_props(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    ScaleD3D11Context *s = ctx->priv;
+    AVFilterLink *inlink = ctx->inputs[0];
+    FilterLink *inl = ff_filter_link(inlink);
+    FilterLink *outl = ff_filter_link(outlink);
+    int ret;
+
+    ///< Clean up any previous resources
+    release_d3d11_resources(s);
+
+    ///< Evaluate output dimensions
+    ret = ff_scale_eval_dimensions(s, s->w_expr, s->h_expr, inlink, outlink, &s->width, &s->height);
+    if (ret < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to evaluate dimensions\n");
+        return ret;
+    }
+
+    outlink->w = s->width;
+    outlink->h = s->height;
+
+    ///< Validate input hw_frames_ctx
+    if (!inl->hw_frames_ctx) {
+        av_log(ctx, AV_LOG_ERROR, "No hw_frames_ctx available on input link\n");
+        return AVERROR(EINVAL);
+    }
+
+    ///< Propagate hw_frames_ctx to output
+    outl->hw_frames_ctx = av_buffer_ref(inl->hw_frames_ctx);
+    if (!outl->hw_frames_ctx) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to propagate hw_frames_ctx to output\n");
+        return AVERROR(ENOMEM);
+    }
+
+    ///< Initialize filter's hardware device context
+    if (!s->hw_device_ctx) {
+        AVHWFramesContext *in_frames_ctx = (AVHWFramesContext *)inl->hw_frames_ctx->data;
+        s->hw_device_ctx = av_buffer_ref(in_frames_ctx->device_ref);
+        if (!s->hw_device_ctx) {
+            av_log(ctx, AV_LOG_ERROR, "Failed to initialize filter hardware device context\n");
+            return AVERROR(ENOMEM);
+        }
+    }
+
+    ///< Get D3D11 device and context (but don't initialize processor yet - done in filter_frame)
+    AVHWDeviceContext *hwctx = (AVHWDeviceContext *)s->hw_device_ctx->data;
+    AVD3D11VADeviceContext *d3d11_hwctx = (AVD3D11VADeviceContext *)hwctx->hwctx;
+
+    s->device = d3d11_hwctx->device;
+    s->context = d3d11_hwctx->device_context;
+
+    if (!s->device || !s->context) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to get valid D3D11 device or context\n");
+        return AVERROR(EINVAL);
+    }
+
+    ///< Create new hardware frames context for output
+    AVHWFramesContext *in_frames_ctx = (AVHWFramesContext *)inl->hw_frames_ctx->data;
+    s->hw_frames_ctx_out = av_hwframe_ctx_alloc(s->hw_device_ctx);
+    if (!s->hw_frames_ctx_out)
+        return AVERROR(ENOMEM);
+
+    AVHWFramesContext *frames_ctx = (AVHWFramesContext *)s->hw_frames_ctx_out->data;
+    frames_ctx->format = AV_PIX_FMT_D3D11;
+    frames_ctx->sw_format = s->format;
+    frames_ctx->width = s->width;
+    frames_ctx->height = s->height;
+    frames_ctx->initial_pool_size = 10;
+
+    if (ctx->extra_hw_frames > 0)
+        frames_ctx->initial_pool_size += ctx->extra_hw_frames;
+
+    AVD3D11VAFramesContext *frames_hwctx = frames_ctx->hwctx;
+    frames_hwctx->MiscFlags = 0;
+    frames_hwctx->BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_VIDEO_ENCODER;
+
+    ret = av_hwframe_ctx_init(s->hw_frames_ctx_out);
+    if (ret < 0) {
+        av_buffer_unref(&s->hw_frames_ctx_out);
+        return ret;
+    }
+
+    outl->hw_frames_ctx = av_buffer_ref(s->hw_frames_ctx_out);
+    if (!outl->hw_frames_ctx)
+        return AVERROR(ENOMEM);
+
+    av_log(ctx, AV_LOG_VERBOSE, "D3D11 scale config: %dx%d -> %dx%d\n",
+           inlink->w, inlink->h, outlink->w, outlink->h);
+    return 0;
+}
+
+static av_cold void scale_d3d11_uninit(AVFilterContext *ctx) {
+    ScaleD3D11Context *s = ctx->priv;
+
+    ///< Release D3D11 resources
+    release_d3d11_resources(s);
+
+    ///< Free the hardware device context reference
+    av_buffer_unref(&s->hw_frames_ctx_out);
+    av_buffer_unref(&s->hw_device_ctx);
+
+    ///< Free option strings
+    av_freep(&s->w_expr);
+    av_freep(&s->h_expr);
+}
+
+static const AVFilterPad scale_d3d11_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = scale_d3d11_filter_frame,
+    },
+};
+
+static const AVFilterPad scale_d3d11_outputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = scale_d3d11_config_props,
+    },
+};
+
+#define OFFSET(x) offsetof(ScaleD3D11Context, x)
+#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
+
+static const AVOption scale_d3d11_options[] = {
+    { "width",  "Output video width",  OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = "iw"}, .flags = FLAGS },
+    { "height", "Output video height", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = "ih"}, .flags = FLAGS },
+    { "format", "Output video pixel format", OFFSET(format), AV_OPT_TYPE_PIXEL_FMT, { .i64 = AV_PIX_FMT_NONE }, INT_MIN, INT_MAX, .flags=FLAGS },
+    { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(scale_d3d11);
+
+const FFFilter ff_vf_scale_d3d11 = {
+    .p.name           = "scale_d3d11",
+    .p.description    = NULL_IF_CONFIG_SMALL("Scale video using Direct3D11"),
+    .priv_size        = sizeof(ScaleD3D11Context),
+    .p.priv_class     = &scale_d3d11_class,
+    .init             = scale_d3d11_init,
+    .uninit           = scale_d3d11_uninit,
+    FILTER_INPUTS(scale_d3d11_inputs),
+    FILTER_OUTPUTS(scale_d3d11_outputs),
+    FILTER_SINGLE_PIXFMT(AV_PIX_FMT_D3D11),
+    .p.flags          = AVFILTER_FLAG_HWDEVICE,
+    .flags_internal   = FF_FILTER_FLAG_HWFRAME_AWARE,
+};
\ No newline at end of file
diff --git a/libavutil/hwcontext_d3d11va.c b/libavutil/hwcontext_d3d11va.c
index 1a047ce57b..7e122d607f 100644
--- a/libavutil/hwcontext_d3d11va.c
+++ b/libavutil/hwcontext_d3d11va.c
@@ -340,19 +340,30 @@ static int d3d11va_get_buffer(AVHWFramesContext *ctx, AVFrame *frame)
 {
     AVD3D11FrameDescriptor *desc;
 
-    frame->buf[0] = av_buffer_pool_get(ctx->pool);
-    if (!frame->buf[0])
-        return AVERROR(ENOMEM);
-
-    desc = (AVD3D11FrameDescriptor *)frame->buf[0]->data;
+    /**
+     * Loop until a buffer becomes available from the pool.
+     * In a full hardware pipeline, all buffers may be temporarily in use by
+     * other modules (encoder/filter/decoder). Rather than immediately failing
+     * with ENOMEM, we wait for a buffer to be released back to the pool, which
+     * maintains pipeline flow and prevents unnecessary allocation failures
+     * during normal operation.
+     */
+    do {
+        frame->buf[0] = av_buffer_pool_get(ctx->pool);
+        if (frame->buf[0]) {
+            desc = (AVD3D11FrameDescriptor *)frame->buf[0]->data;
+            frame->data[0] = (uint8_t *)desc->texture;
+            frame->data[1] = (uint8_t *)desc->index;
+            frame->format  = AV_PIX_FMT_D3D11;
+            frame->width   = ctx->width;
+            frame->height  = ctx->height;
+            return 0;
+        }
 
-    frame->data[0] = (uint8_t *)desc->texture;
-    frame->data[1] = (uint8_t *)desc->index;
-    frame->format  = AV_PIX_FMT_D3D11;
-    frame->width   = ctx->width;
-    frame->height  = ctx->height;
+        av_usleep(500);
+    } while (1);
 
-    return 0;
+    return AVERROR(ENOMEM);
 }
 
 static int d3d11va_transfer_get_formats(AVHWFramesContext *ctx,
-- 
2.34.1


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