[FFmpeg-devel] [PATCH 01/10, v2] avutil: add hwcontext_amf.

Dmitrii Ovchinnikov ovchinnikov.dmitrii at gmail.com
Wed May 1 21:38:00 EEST 2024


Adds hwcontext_amf, which allows to use shared AMF
context for the encoder, decoder and AMF-based filters,
without copy to the host memory.
It will also allow you to use some optimizations in
the interaction of components (for example, SAV) and make a more
manageable and optimal setup for using GPU devices with AMF
in the case of a fully AMF pipeline.
It will be a significant performance uplift when full AMF pipeline
with filters is used.

We also plan to add Compression artefact removal filter in near feature.
v2: cleanup header files, fixed naming and formats
---
 libavutil/Makefile                 |   4 +
 libavutil/hwcontext.c              |   4 +
 libavutil/hwcontext.h              |   1 +
 libavutil/hwcontext_amf.c          | 588 +++++++++++++++++++++++++++++
 libavutil/hwcontext_amf.h          |  41 ++
 libavutil/hwcontext_amf_internal.h |  77 ++++
 libavutil/hwcontext_internal.h     |   1 +
 libavutil/pixdesc.c                |   4 +
 libavutil/pixfmt.h                 |   5 +
 9 files changed, 725 insertions(+)
 create mode 100644 libavutil/hwcontext_amf.c
 create mode 100644 libavutil/hwcontext_amf.h
 create mode 100644 libavutil/hwcontext_amf_internal.h

diff --git a/libavutil/Makefile b/libavutil/Makefile
index 6e6fa8d800..13c318560d 100644
--- a/libavutil/Makefile
+++ b/libavutil/Makefile
@@ -45,6 +45,7 @@ HEADERS = adler32.h                                                     \
           hwcontext_d3d12va.h                                           \
           hwcontext_drm.h                                               \
           hwcontext_dxva2.h                                             \
+          hwcontext_amf.h                                               \
           hwcontext_qsv.h                                               \
           hwcontext_mediacodec.h                                        \
           hwcontext_opencl.h                                            \
@@ -196,6 +197,7 @@ OBJS-$(CONFIG_CUDA)                     += hwcontext_cuda.o
 OBJS-$(CONFIG_D3D11VA)                  += hwcontext_d3d11va.o
 OBJS-$(CONFIG_D3D12VA)                  += hwcontext_d3d12va.o
 OBJS-$(CONFIG_DXVA2)                    += hwcontext_dxva2.o
+OBJS-$(CONFIG_AMF)                      += hwcontext_amf.o
 OBJS-$(CONFIG_LIBDRM)                   += hwcontext_drm.o
 OBJS-$(CONFIG_MACOS_KPERF)              += macos_kperf.o
 OBJS-$(CONFIG_MEDIACODEC)               += hwcontext_mediacodec.o
@@ -220,6 +222,8 @@ SKIPHEADERS-$(CONFIG_CUDA)             += hwcontext_cuda_internal.h     \
 SKIPHEADERS-$(CONFIG_D3D11VA)          += hwcontext_d3d11va.h
 SKIPHEADERS-$(CONFIG_D3D12VA)          += hwcontext_d3d12va.h
 SKIPHEADERS-$(CONFIG_DXVA2)            += hwcontext_dxva2.h
+SKIPHEADERS-$(CONFIG_AMF)              += hwcontext_amf.h               \
+                                          hwcontext_amf_internal
 SKIPHEADERS-$(CONFIG_QSV)              += hwcontext_qsv.h
 SKIPHEADERS-$(CONFIG_OPENCL)           += hwcontext_opencl.h
 SKIPHEADERS-$(CONFIG_VAAPI)            += hwcontext_vaapi.h
diff --git a/libavutil/hwcontext.c b/libavutil/hwcontext.c
index fa99a0d8a4..f06d49c45c 100644
--- a/libavutil/hwcontext.c
+++ b/libavutil/hwcontext.c
@@ -65,6 +65,9 @@ static const HWContextType * const hw_table[] = {
 #endif
 #if CONFIG_VULKAN
     &ff_hwcontext_type_vulkan,
+#endif
+#if CONFIG_AMF
+    &ff_hwcontext_type_amf,
 #endif
     NULL,
 };
@@ -82,6 +85,7 @@ static const char *const hw_type_names[] = {
     [AV_HWDEVICE_TYPE_VIDEOTOOLBOX] = "videotoolbox",
     [AV_HWDEVICE_TYPE_MEDIACODEC] = "mediacodec",
     [AV_HWDEVICE_TYPE_VULKAN] = "vulkan",
+    [AV_HWDEVICE_TYPE_AMF] = "amf",
 };
 
 typedef struct FFHWDeviceContext {
diff --git a/libavutil/hwcontext.h b/libavutil/hwcontext.h
index bac30debae..96042ba197 100644
--- a/libavutil/hwcontext.h
+++ b/libavutil/hwcontext.h
@@ -38,6 +38,7 @@ enum AVHWDeviceType {
     AV_HWDEVICE_TYPE_MEDIACODEC,
     AV_HWDEVICE_TYPE_VULKAN,
     AV_HWDEVICE_TYPE_D3D12VA,
+    AV_HWDEVICE_TYPE_AMF,
 };
 
 /**
diff --git a/libavutil/hwcontext_amf.c b/libavutil/hwcontext_amf.c
new file mode 100644
index 0000000000..8edfb20fbb
--- /dev/null
+++ b/libavutil/hwcontext_amf.c
@@ -0,0 +1,588 @@
+/*
+ * 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 "buffer.h"
+#include "common.h"
+#include "hwcontext.h"
+#include "hwcontext_amf.h"
+#include "hwcontext_internal.h"
+#include "hwcontext_amf_internal.h"
+#if CONFIG_VULKAN
+#include "hwcontext_vulkan.h"
+#endif
+#if CONFIG_D3D11VA
+#include "libavutil/hwcontext_d3d11va.h"
+#endif
+#if CONFIG_DXVA2
+#define COBJMACROS
+#include "libavutil/hwcontext_dxva2.h"
+#endif
+#include "mem.h"
+#include "pixdesc.h"
+#include "pixfmt.h"
+#include "imgutils.h"
+#include "libavutil/avassert.h"
+#include <AMF/core/Surface.h>
+#ifdef _WIN32
+#include "compat/w32dlfcn.h"
+#else
+#include <dlfcn.h>
+#endif
+#define FFMPEG_AMF_WRITER_ID L"ffmpeg_amf"
+int av_amf_load_library(AVAMFDeviceContextInternal* internal,  void* avcl);
+
+typedef struct AMFFramesContext {
+    AMFSurface * surfaces;
+    int            nb_surfaces;
+} AMFFramesContext;
+
+typedef struct AVAMFFormatMap {
+    enum AVPixelFormat       av_format;
+    enum AMF_SURFACE_FORMAT  amf_format;
+} FormatMap;
+
+
+static const AVClass amflib_class = {
+    .class_name = "amf",
+    .item_name = av_default_item_name,
+    .version = LIBAVUTIL_VERSION_INT,
+};
+
+typedef struct AMFLibraryContext {
+    const AVClass      *avclass;
+} AMFLibraryContext;
+
+static AMFLibraryContext amflib_context =
+{
+    .avclass = &amflib_class,
+};
+
+
+static void AMF_CDECL_CALL AMFTraceWriter_Write(AMFTraceWriter *pThis,
+    const wchar_t *scope, const wchar_t *message)
+{
+    AmfTraceWriter *tracer = (AmfTraceWriter*)pThis;
+    av_log(tracer->avcl, AV_LOG_DEBUG, "%ls: %ls", scope, message); // \n is provided from AMF
+}
+
+static void AMF_CDECL_CALL AMFTraceWriter_Flush(AMFTraceWriter *pThis)
+{
+}
+
+static AMFTraceWriterVtbl tracer_vtbl =
+{
+    .Write = AMFTraceWriter_Write,
+    .Flush = AMFTraceWriter_Flush,
+};
+
+AmfTraceWriter av_amf_trace_writer =
+{
+    .vtbl = &tracer_vtbl,
+    .avcl = &amflib_context,
+    .avctx = NULL
+};
+
+const FormatMap format_map[] =
+{
+    { AV_PIX_FMT_NONE,          AMF_SURFACE_UNKNOWN },
+    { AV_PIX_FMT_NV12,          AMF_SURFACE_NV12 },
+    { AV_PIX_FMT_BGR0,          AMF_SURFACE_BGRA },
+    { AV_PIX_FMT_RGB0,          AMF_SURFACE_RGBA },
+    { AV_PIX_FMT_BGRA,          AMF_SURFACE_BGRA },
+    { AV_PIX_FMT_ARGB,          AMF_SURFACE_ARGB },
+    { AV_PIX_FMT_RGBA,          AMF_SURFACE_RGBA },
+    { AV_PIX_FMT_GRAY8,         AMF_SURFACE_GRAY8 },
+    { AV_PIX_FMT_YUV420P,       AMF_SURFACE_YUV420P },
+    { AV_PIX_FMT_YUYV422,       AMF_SURFACE_YUY2 },
+    { AV_PIX_FMT_P010,          AMF_SURFACE_P010 },
+};
+
+enum AMF_SURFACE_FORMAT av_amf_av_to_amf_format(enum AVPixelFormat fmt)
+{
+    int i;
+    for (i = 0; i < amf_countof(format_map); i++) {
+        if (format_map[i].av_format == fmt) {
+            return format_map[i].amf_format;
+        }
+    }
+    return AMF_SURFACE_UNKNOWN;
+}
+
+enum AVPixelFormat av_amf_to_av_format(enum AMF_SURFACE_FORMAT fmt)
+{
+    int i;
+    for (i = 0; i < amf_countof(format_map); i++) {
+        if (format_map[i].amf_format == fmt) {
+            return format_map[i].av_format;
+        }
+    }
+    return AMF_SURFACE_UNKNOWN;
+}
+
+static const enum AVPixelFormat supported_formats[] = {
+    AV_PIX_FMT_NV12,
+    AV_PIX_FMT_YUV420P,
+    AV_PIX_FMT_BGRA,
+    AV_PIX_FMT_P010,
+    AV_PIX_FMT_YUV420P10,
+#if CONFIG_D3D11VA
+    AV_PIX_FMT_D3D11,
+#endif
+#if CONFIG_DXVA2
+    AV_PIX_FMT_DXVA2_VLD,
+#endif
+    AV_PIX_FMT_AMF_SURFACE
+};
+
+static int amf_frames_get_constraints(AVHWDeviceContext *ctx,
+                                       const void *hwconfig,
+                                       AVHWFramesConstraints *constraints)
+{
+    int i;
+
+    constraints->valid_sw_formats = av_malloc_array(FF_ARRAY_ELEMS(supported_formats) + 1,
+                                                    sizeof(*constraints->valid_sw_formats));
+    if (!constraints->valid_sw_formats)
+        return AVERROR(ENOMEM);
+
+    for (i = 0; i < FF_ARRAY_ELEMS(supported_formats); i++)
+        constraints->valid_sw_formats[i] = supported_formats[i];
+    constraints->valid_sw_formats[FF_ARRAY_ELEMS(supported_formats)] = AV_PIX_FMT_NONE;
+
+    constraints->valid_hw_formats = av_malloc_array(2, sizeof(*constraints->valid_hw_formats));
+    if (!constraints->valid_hw_formats)
+        return AVERROR(ENOMEM);
+
+    constraints->valid_hw_formats[0] = AV_PIX_FMT_AMF_SURFACE;
+    constraints->valid_hw_formats[1] = AV_PIX_FMT_NONE;
+
+    return 0;
+}
+
+static void amf_dummy_free(void *opaque, uint8_t *data)
+{
+
+}
+
+static AVBufferRef *amf_pool_alloc(void *opaque, size_t size)
+{
+    AVHWFramesContext *hwfc = (AVHWFramesContext *)opaque;
+    AVBufferRef *buf;
+
+    buf = av_buffer_create(NULL, NULL, amf_dummy_free, hwfc, AV_BUFFER_FLAG_READONLY);
+    if (!buf) {
+        av_log(hwfc, AV_LOG_ERROR, "Failed to create buffer for AMF context.\n");
+        return NULL;
+    }
+    return buf;
+}
+
+static int amf_frames_init(AVHWFramesContext *ctx)
+{
+    int i;
+
+    for (i = 0; i < FF_ARRAY_ELEMS(supported_formats); i++) {
+        if (ctx->sw_format == supported_formats[i])
+            break;
+    }
+    if (i == FF_ARRAY_ELEMS(supported_formats)) {
+        av_log(ctx, AV_LOG_ERROR, "Pixel format '%s' is not supported\n",
+               av_get_pix_fmt_name(ctx->sw_format));
+        return AVERROR(ENOSYS);
+    }
+
+    ffhwframesctx(ctx)->pool_internal =
+        av_buffer_pool_init2(sizeof(AMFSurface), ctx,
+                             amf_pool_alloc, NULL);
+
+
+    return 0;
+}
+
+static int amf_get_buffer(AVHWFramesContext *ctx, AVFrame *frame)
+{
+    frame->buf[0] = av_buffer_pool_get(ctx->pool);
+    if (!frame->buf[0])
+        return AVERROR(ENOMEM);
+
+    frame->data[0] = frame->buf[0]->data;
+    frame->format  = AV_PIX_FMT_AMF_SURFACE;
+    frame->width   = ctx->width;
+    frame->height  = ctx->height;
+    return 0;
+}
+
+static int amf_transfer_get_formats(AVHWFramesContext *ctx,
+                                     enum AVHWFrameTransferDirection dir,
+                                     enum AVPixelFormat **formats)
+{
+    enum AVPixelFormat *fmts;
+
+    fmts = av_malloc_array(2, sizeof(*fmts));
+    if (!fmts)
+        return AVERROR(ENOMEM);
+
+    fmts[0] = ctx->sw_format;
+    fmts[1] = AV_PIX_FMT_NONE;
+
+    *formats = fmts;
+
+    return 0;
+}
+
+static int amf_transfer_data_to(AVHWFramesContext *ctx, AVFrame *dst,
+                                 const AVFrame *src)
+{
+    AMFSurface* surface = (AMFSurface*)dst->data[0];
+    AMFPlane *plane;
+    uint8_t  *dst_data[4];
+    int       dst_linesize[4];
+    int       planes;
+    int       i;
+    int w = FFMIN(dst->width,  src->width);
+    int h = FFMIN(dst->height, src->height);
+
+    planes = (int)surface->pVtbl->GetPlanesCount(surface);
+    av_assert0(planes < FF_ARRAY_ELEMS(dst_data));
+
+    for (i = 0; i < planes; i++) {
+        plane = surface->pVtbl->GetPlaneAt(surface, i);
+        dst_data[i] = plane->pVtbl->GetNative(plane);
+        dst_linesize[i] = plane->pVtbl->GetHPitch(plane);
+    }
+    av_image_copy(dst_data, dst_linesize,
+        (const uint8_t**)src->data, src->linesize, src->format,
+        w, h);
+
+    return 0;
+}
+static int amf_transfer_data_from(AVHWFramesContext *ctx, AVFrame *dst,
+                                    const AVFrame *src)
+{
+    AMFSurface* surface = (AMFSurface*)src->data[0];
+    AMFPlane *plane;
+    uint8_t  *src_data[4];
+    int       src_linesize[4];
+    int       planes;
+    int       i;
+    int w = FFMIN(dst->width,  src->width);
+    int h = FFMIN(dst->height, src->height);
+    int ret;
+
+    ret = surface->pVtbl->Convert(surface, AMF_MEMORY_HOST);
+    AMF_RETURN_IF_FALSE(ctx, ret == AMF_OK, AVERROR_UNKNOWN, "Convert(amf::AMF_MEMORY_HOST) failed with error %d\n", AVERROR_UNKNOWN);
+
+    planes = (int)surface->pVtbl->GetPlanesCount(surface);
+    av_assert0(planes < FF_ARRAY_ELEMS(src_data));
+
+    for (i = 0; i < planes; i++) {
+        plane = surface->pVtbl->GetPlaneAt(surface, i);
+        src_data[i] = plane->pVtbl->GetNative(plane);
+        src_linesize[i] = plane->pVtbl->GetHPitch(plane);
+    }
+    av_image_copy(dst->data, dst->linesize,
+                  (const uint8_t **)src_data, src_linesize, dst->format,
+                  w, h);
+    surface->pVtbl->Release(surface);
+    return 0;
+}
+
+
+static void amf_device_uninit(AVHWDeviceContext *device_ctx)
+{
+    AVAMFDeviceContext      *amf_ctx = device_ctx->hwctx;
+    av_buffer_unref(&amf_ctx->internal);
+}
+
+static int amf_device_init(AVHWDeviceContext *ctx)
+{
+    AVAMFDeviceContext *amf_ctx = ctx->hwctx;
+    return av_amf_context_init((AVAMFDeviceContextInternal * )amf_ctx->internal->data, ctx);
+}
+
+static int amf_device_create(AVHWDeviceContext *device_ctx,
+                              const char *device,
+                              AVDictionary *opts, int flags)
+{
+    AVAMFDeviceContext        *ctx = device_ctx->hwctx;
+    AVAMFDeviceContextInternal *wrapped = av_mallocz(sizeof(*wrapped));
+    ctx->internal = av_buffer_create((uint8_t *)wrapped, sizeof(*wrapped),
+                                                    av_amf_context_internal_free, NULL, 0);
+    AVAMFDeviceContextInternal * internal = (AVAMFDeviceContextInternal * )ctx->internal->data;
+    int ret;
+    if ((ret = av_amf_load_library(internal, device_ctx)) == 0) {
+        if ((ret = av_amf_create_context(internal, device_ctx, "", opts, flags)) == 0){
+            return 0;
+        }
+    }
+    amf_device_uninit(device_ctx);
+    return ret;
+}
+
+static int amf_device_derive(AVHWDeviceContext *device_ctx,
+                              AVHWDeviceContext *child_device_ctx, AVDictionary *opts,
+                              int flags)
+{
+    AVAMFDeviceContext        *ctx = device_ctx->hwctx;
+    AVAMFDeviceContextInternal * internal = (AVAMFDeviceContextInternal * )ctx->internal->data;
+    int ret;
+
+    ret = amf_device_create(device_ctx, "", opts, flags);
+    if(ret < 0)
+        return ret;
+
+    return av_amf_context_derive(internal, child_device_ctx, opts, flags);
+}
+
+#if CONFIG_DXVA2
+static int amf_init_from_dxva2_device(AVAMFDeviceContextInternal * internal, AVDXVA2DeviceContext *hwctx)
+{
+    IDirect3DDevice9    *device;
+    HANDLE              device_handle;
+    HRESULT             hr;
+    AMF_RESULT          res;
+    int ret;
+
+    hr = IDirect3DDeviceManager9_OpenDeviceHandle(hwctx->devmgr, &device_handle);
+    if (FAILED(hr)) {
+        av_log(hwctx, AV_LOG_ERROR, "Failed to open device handle for Direct3D9 device: %lx.\n", (unsigned long)hr);
+        return AVERROR_EXTERNAL;
+    }
+
+    hr = IDirect3DDeviceManager9_LockDevice(hwctx->devmgr, device_handle, &device, FALSE);
+    if (SUCCEEDED(hr)) {
+        IDirect3DDeviceManager9_UnlockDevice(hwctx->devmgr, device_handle, FALSE);
+        ret = 0;
+    } else {
+        av_log(hwctx, AV_LOG_ERROR, "Failed to lock device handle for Direct3D9 device: %lx.\n", (unsigned long)hr);
+        ret = AVERROR_EXTERNAL;
+    }
+
+
+    IDirect3DDeviceManager9_CloseDeviceHandle(hwctx->devmgr, device_handle);
+
+    if (ret < 0)
+        return ret;
+
+    res = internal->context->pVtbl->InitDX9(internal->context, device);
+
+    IDirect3DDevice9_Release(device);
+
+    if (res != AMF_OK) {
+        if (res == AMF_NOT_SUPPORTED)
+            av_log(hwctx, AV_LOG_ERROR, "AMF via D3D9 is not supported on the given device.\n");
+        else
+            av_log(hwctx, AV_LOG_ERROR, "AMF failed to initialise on given D3D9 device: %d.\n", res);
+        return AVERROR(ENODEV);
+    }
+    internal->mem_type = AMF_MEMORY_DX9;
+    return 0;
+}
+#endif
+
+#if CONFIG_D3D11VA
+static int amf_init_from_d3d11_device(AVAMFDeviceContextInternal* internal, AVD3D11VADeviceContext *hwctx)
+{
+    AMF_RESULT res;
+    res = internal->context->pVtbl->InitDX11(internal->context, hwctx->device, AMF_DX11_1);
+    if (res != AMF_OK) {
+        if (res == AMF_NOT_SUPPORTED)
+            av_log(hwctx, AV_LOG_ERROR, "AMF via D3D11 is not supported on the given device.\n");
+        else
+            av_log(hwctx, AV_LOG_ERROR, "AMF failed to initialise on the given D3D11 device: %d.\n", res);
+        return AVERROR(ENODEV);
+    }
+    internal->mem_type = AMF_MEMORY_DX11;
+    return 0;
+}
+#endif
+
+int av_amf_context_init(AVAMFDeviceContextInternal* internal, void* avcl)
+{
+     AMFContext1 *context1 = NULL;
+     AMF_RESULT res;
+
+    res = internal->context->pVtbl->InitDX11(internal->context, NULL, AMF_DX11_1);
+    if (res == AMF_OK) {
+        internal->mem_type = AMF_MEMORY_DX11;
+        av_log(avcl, AV_LOG_VERBOSE, "AMF initialisation succeeded via D3D11.\n");
+    } else {
+        res = internal->context->pVtbl->InitDX9(internal->context, NULL);
+        if (res == AMF_OK) {
+            internal->mem_type = AMF_MEMORY_DX9;
+            av_log(avcl, AV_LOG_VERBOSE, "AMF initialisation succeeded via D3D9.\n");
+        } else {
+            AMFGuid guid = IID_AMFContext1();
+            res = internal->context->pVtbl->QueryInterface(internal->context, &guid, (void**)&context1);
+            AMF_RETURN_IF_FALSE(avcl, res == AMF_OK, AVERROR_UNKNOWN, "CreateContext1() failed with error %d\n", res);
+
+            res = context1->pVtbl->InitVulkan(context1, NULL);
+            context1->pVtbl->Release(context1);
+            if (res != AMF_OK) {
+                if (res == AMF_NOT_SUPPORTED)
+                    av_log(avcl, AV_LOG_ERROR, "AMF via Vulkan is not supported on the given device.\n");
+                 else
+                    av_log(avcl, AV_LOG_ERROR, "AMF failed to initialise on the given Vulkan device: %d.\n", res);
+                 return AVERROR(ENOSYS);
+            }
+            internal->mem_type = AMF_MEMORY_VULKAN;
+            av_log(avcl, AV_LOG_VERBOSE, "AMF initialisation succeeded via Vulkan.\n");
+         }
+     }
+     return 0;
+}
+int av_amf_load_library(AVAMFDeviceContextInternal* internal,  void* avcl)
+{
+    AMFInit_Fn         init_fun;
+    AMFQueryVersion_Fn version_fun;
+    AMF_RESULT         res;
+
+    internal->library = dlopen(AMF_DLL_NAMEA, RTLD_NOW | RTLD_LOCAL);
+    AMF_RETURN_IF_FALSE(avcl, internal->library != NULL,
+        AVERROR_UNKNOWN, "DLL %s failed to open\n", AMF_DLL_NAMEA);
+
+    init_fun = (AMFInit_Fn)dlsym(internal->library, AMF_INIT_FUNCTION_NAME);
+    AMF_RETURN_IF_FALSE(avcl, init_fun != NULL, AVERROR_UNKNOWN, "DLL %s failed to find function %s\n", AMF_DLL_NAMEA, AMF_INIT_FUNCTION_NAME);
+
+    version_fun = (AMFQueryVersion_Fn)dlsym(internal->library, AMF_QUERY_VERSION_FUNCTION_NAME);
+    AMF_RETURN_IF_FALSE(avcl, version_fun != NULL, AVERROR_UNKNOWN, "DLL %s failed to find function %s\n", AMF_DLL_NAMEA, AMF_QUERY_VERSION_FUNCTION_NAME);
+
+    res = version_fun(&internal->version);
+    AMF_RETURN_IF_FALSE(avcl, res == AMF_OK, AVERROR_UNKNOWN, "%s failed with error %d\n", AMF_QUERY_VERSION_FUNCTION_NAME, res);
+    res = init_fun(AMF_FULL_VERSION, &internal->factory);
+    AMF_RETURN_IF_FALSE(avcl, res == AMF_OK, AVERROR_UNKNOWN, "%s failed with error %d\n", AMF_INIT_FUNCTION_NAME, res);
+    res = internal->factory->pVtbl->GetTrace(internal->factory, &internal->trace);
+    AMF_RETURN_IF_FALSE(avcl, res == AMF_OK, AVERROR_UNKNOWN, "GetTrace() failed with error %d\n", res);
+    res = internal->factory->pVtbl->GetDebug(internal->factory, &internal->debug);
+    AMF_RETURN_IF_FALSE(avcl, res == AMF_OK, AVERROR_UNKNOWN, "GetDebug() failed with error %d\n", res);
+    return 0;
+}
+
+int av_amf_create_context(  AVAMFDeviceContextInternal * internal,
+                                void* avcl,
+                                const char *device,
+                                AVDictionary *opts, int flags)
+{
+    AMF_RESULT         res;
+
+    internal->trace->pVtbl->EnableWriter(internal->trace, AMF_TRACE_WRITER_CONSOLE, 0);
+    internal->trace->pVtbl->SetGlobalLevel(internal->trace, AMF_TRACE_TRACE);
+
+     // connect AMF logger to av_log
+    av_amf_trace_writer.avctx = avcl;
+    internal->trace->pVtbl->RegisterWriter(internal->trace, FFMPEG_AMF_WRITER_ID, (AMFTraceWriter*)&av_amf_trace_writer, 1);
+    internal->trace->pVtbl->SetWriterLevel(internal->trace, FFMPEG_AMF_WRITER_ID, AMF_TRACE_TRACE);
+
+    res = internal->factory->pVtbl->CreateContext(internal->factory, &internal->context);
+    AMF_RETURN_IF_FALSE(avcl, res == AMF_OK, AVERROR_UNKNOWN, "CreateContext() failed with error %d\n", res);
+
+    return 0;
+}
+
+int av_amf_context_internal_create(AVAMFDeviceContextInternal * internal,
+                                void* avcl,
+                                const char *device,
+                                AVDictionary *opts, int flags)
+{
+    int ret;
+    if ((ret = av_amf_load_library(internal, avcl)) == 0) {
+        if ((ret = av_amf_create_context(internal, avcl, "", opts, flags)) == 0){
+            return 0;
+        }
+    }
+    av_amf_context_internal_free(0, (uint8_t *)internal);
+    return ret;
+}
+
+void av_amf_context_internal_free(void *opaque, uint8_t *data)
+{
+    AVAMFDeviceContextInternal *amf_ctx = (AVAMFDeviceContextInternal *)data;
+    if (amf_ctx->context) {
+        amf_ctx->context->pVtbl->Terminate(amf_ctx->context);
+        amf_ctx->context->pVtbl->Release(amf_ctx->context);
+        amf_ctx->context = NULL;
+    }
+
+    if (amf_ctx->trace) {
+        amf_ctx->trace->pVtbl->UnregisterWriter(amf_ctx->trace, FFMPEG_AMF_WRITER_ID);
+    }
+
+    if(amf_ctx->library) {
+        dlclose(amf_ctx->library);
+        amf_ctx->library = NULL;
+    }
+
+    amf_ctx->debug = NULL;
+    amf_ctx->version = 0;
+    av_free(amf_ctx);
+}
+
+int av_amf_context_derive(AVAMFDeviceContextInternal * internal,
+                               AVHWDeviceContext *child_device_ctx, AVDictionary *opts,
+                               int flags)
+{
+
+    switch (child_device_ctx->type) {
+
+#if CONFIG_DXVA2
+    case AV_HWDEVICE_TYPE_DXVA2:
+        {
+            AVDXVA2DeviceContext *child_device_hwctx = child_device_ctx->hwctx;
+            return amf_init_from_dxva2_device(internal, child_device_hwctx);
+        }
+        break;
+#endif
+
+#if CONFIG_D3D11VA
+    case AV_HWDEVICE_TYPE_D3D11VA:
+        {
+            AVD3D11VADeviceContext *child_device_hwctx = child_device_ctx->hwctx;
+            return amf_init_from_d3d11_device(internal, child_device_hwctx);
+        }
+        break;
+#endif
+    default:
+        {
+            av_log(child_device_ctx, AV_LOG_ERROR, "AMF initialisation from a %s device is not supported.\n",
+                av_hwdevice_get_type_name(child_device_ctx->type));
+            return AVERROR(ENOSYS);
+        }
+    }
+    return 0;
+}
+
+const HWContextType ff_hwcontext_type_amf = {
+    .type                 = AV_HWDEVICE_TYPE_AMF,
+    .name                 = "AMF",
+
+    .device_hwctx_size    = sizeof(AVAMFDeviceContext),
+    .frames_hwctx_size    = sizeof(AMFFramesContext),
+
+    .device_create        = amf_device_create,
+    .device_derive        = amf_device_derive,
+    .device_init          = amf_device_init,
+    .device_uninit        = amf_device_uninit,
+    .frames_get_constraints = amf_frames_get_constraints,
+    .frames_init          = amf_frames_init,
+    .frames_get_buffer    = amf_get_buffer,
+    .transfer_get_formats = amf_transfer_get_formats,
+    .transfer_data_to     = amf_transfer_data_to,
+    .transfer_data_from   = amf_transfer_data_from,
+
+    .pix_fmts             = (const enum AVPixelFormat[]){ AV_PIX_FMT_AMF_SURFACE, AV_PIX_FMT_NONE },
+};
diff --git a/libavutil/hwcontext_amf.h b/libavutil/hwcontext_amf.h
new file mode 100644
index 0000000000..36f13890a0
--- /dev/null
+++ b/libavutil/hwcontext_amf.h
@@ -0,0 +1,41 @@
+/*
+ * 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
+ */
+
+
+#ifndef AVUTIL_HWCONTEXT_AMF_H
+#define AVUTIL_HWCONTEXT_AMF_H
+
+#include "pixfmt.h"
+
+#include "libavformat/avformat.h"
+#include "libavutil/hwcontext.h"
+
+typedef struct AVAMFDeviceContextInternal AVAMFDeviceContextInternal;
+
+/**
+ * This struct is allocated as AVHWDeviceContext.hwctx
+ */
+
+typedef struct AVAMFDeviceContext {
+    AVBufferRef        *internal;
+} AVAMFDeviceContext;
+
+enum AMF_SURFACE_FORMAT av_amf_av_to_amf_format(enum AVPixelFormat fmt);
+enum AVPixelFormat av_amf_to_av_format(enum AMF_SURFACE_FORMAT fmt);
+
+#endif /* AVUTIL_HWCONTEXT_AMF_H */
diff --git a/libavutil/hwcontext_amf_internal.h b/libavutil/hwcontext_amf_internal.h
new file mode 100644
index 0000000000..023dc8b4bb
--- /dev/null
+++ b/libavutil/hwcontext_amf_internal.h
@@ -0,0 +1,77 @@
+/*
+ * 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
+ */
+
+
+#ifndef AVUTIL_HWCONTEXT_AMF_INTERNAL_H
+#define AVUTIL_HWCONTEXT_AMF_INTERNAL_H
+#include <AMF/core/Factory.h>
+#include <AMF/core/Context.h>
+#include <AMF/core/Trace.h>
+
+typedef struct AVAMFDeviceContextInternal {
+    amf_handle          library; ///< handle to DLL library
+    AMFFactory         *factory; ///< pointer to AMF factory
+    AMFDebug           *debug;   ///< pointer to AMF debug interface
+    AMFTrace           *trace;   ///< pointer to AMF trace interface
+
+    amf_uint64          version; ///< version of AMF runtime
+    AMFContext         *context; ///< AMF context
+    AMF_MEMORY_TYPE     mem_type;
+} AVAMFDeviceContextInternal;
+
+typedef struct AmfTraceWriter {
+    AMFTraceWriterVtbl  *vtbl;
+    void                *avctx;
+    void                *avcl;
+} AmfTraceWriter;
+
+extern AmfTraceWriter av_amf_trace_writer;
+
+int av_amf_context_init(AVAMFDeviceContextInternal* internal, void* avcl);
+int av_amf_create_context(  AVAMFDeviceContextInternal * internal,
+                                void* avcl,
+                                const char *device,
+                                AVDictionary *opts, int flags);
+int av_amf_context_internal_create(AVAMFDeviceContextInternal * internal,
+                                void* avcl,
+                                const char *device,
+                                AVDictionary *opts, int flags);
+void av_amf_context_internal_free(void *opaque, uint8_t *data);
+int av_amf_context_derive(AVAMFDeviceContextInternal * internal,
+                              AVHWDeviceContext *child_device_ctx, AVDictionary *opts,
+                              int flags);
+
+
+/**
+* Error handling helper
+*/
+#define AMF_RETURN_IF_FALSE(avctx, exp, ret_value, /*message,*/ ...) \
+    if (!(exp)) { \
+        av_log(avctx, AV_LOG_ERROR, __VA_ARGS__); \
+        return ret_value; \
+    }
+
+#define AMF_GOTO_FAIL_IF_FALSE(avctx, exp, ret_value, /*message,*/ ...) \
+    if (!(exp)) { \
+        av_log(avctx, AV_LOG_ERROR, __VA_ARGS__); \
+        ret = ret_value; \
+        goto fail; \
+    }
+
+#define AMF_TIME_BASE_Q          (AVRational){1, AMF_SECOND}
+#endif /* AVUTIL_HWCONTEXT_AMF_INTERNAL_H */
\ No newline at end of file
diff --git a/libavutil/hwcontext_internal.h b/libavutil/hwcontext_internal.h
index e32b786238..db23579c9e 100644
--- a/libavutil/hwcontext_internal.h
+++ b/libavutil/hwcontext_internal.h
@@ -163,5 +163,6 @@ extern const HWContextType ff_hwcontext_type_vdpau;
 extern const HWContextType ff_hwcontext_type_videotoolbox;
 extern const HWContextType ff_hwcontext_type_mediacodec;
 extern const HWContextType ff_hwcontext_type_vulkan;
+extern const HWContextType ff_hwcontext_type_amf;
 
 #endif /* AVUTIL_HWCONTEXT_INTERNAL_H */
diff --git a/libavutil/pixdesc.c b/libavutil/pixdesc.c
index 1c0bcf2232..5438c97a8f 100644
--- a/libavutil/pixdesc.c
+++ b/libavutil/pixdesc.c
@@ -2119,6 +2119,10 @@ static const AVPixFmtDescriptor av_pix_fmt_descriptors[AV_PIX_FMT_NB] = {
         .name = "cuda",
         .flags = AV_PIX_FMT_FLAG_HWACCEL,
     },
+    [AV_PIX_FMT_AMF_SURFACE] = {
+        .name = "amf",
+        .flags = AV_PIX_FMT_FLAG_HWACCEL,
+    },
     [AV_PIX_FMT_AYUV64LE] = {
         .name = "ayuv64le",
         .nb_components = 4,
diff --git a/libavutil/pixfmt.h b/libavutil/pixfmt.h
index a7f50e1690..29f67e707f 100644
--- a/libavutil/pixfmt.h
+++ b/libavutil/pixfmt.h
@@ -439,6 +439,11 @@ enum AVPixelFormat {
      */
     AV_PIX_FMT_D3D12,
 
+    /**
+     * HW acceleration through AMF. data[0] contain AMFSurface pointer
+     */
+    AV_PIX_FMT_AMF_SURFACE,
+
     AV_PIX_FMT_NB         ///< number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of formats might differ between versions
 };
 
-- 
2.38.1.windows.1



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