avutil/hwcontext_d3d12va: Allocate pub and priv frames hwctx together

This is possible because the lifetime of both coincide.
Besides reducing the number of allocations this also simplifies
access to D3D12VAFramesContext as one no longer has to
go through AVHWFramesInternal.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavutil/hwcontext_d3d12va.c

@@ -36,6 +36,11 @@
 typedef HRESULT(WINAPI *PFN_CREATE_DXGI_FACTORY2)(UINT Flags, REFIID riid, void **ppFactory);
 
 typedef struct D3D12VAFramesContext {
+    /**
+     * The public AVD3D12VAFramesContext. See hwcontext_d3d12va.h for it.
+     */
+    AVD3D12VAFramesContext p;
+
     ID3D12Resource            *staging_download_buffer;
     ID3D12Resource            *staging_upload_buffer;
     ID3D12CommandQueue        *command_queue;
@@ -101,7 +106,7 @@ static int d3d12va_create_staging_buffer_resource(AVHWFramesContext *ctx, D3D12_
                                                   ID3D12Resource **ppResource, int download)
 {
     AVD3D12VADeviceContext *device_hwctx = ctx->device_ctx->hwctx;
-    D3D12VAFramesContext   *s            = ctx->internal->priv;
+    D3D12VAFramesContext   *s            = ctx->hwctx;
     D3D12_HEAP_PROPERTIES props = { .Type = download ? D3D12_HEAP_TYPE_READBACK : D3D12_HEAP_TYPE_UPLOAD };
     D3D12_RESOURCE_DESC desc = {
         .Dimension          = D3D12_RESOURCE_DIMENSION_BUFFER,
@@ -128,8 +133,8 @@ static int d3d12va_create_staging_buffer_resource(AVHWFramesContext *ctx, D3D12_
 static int d3d12va_create_helper_objects(AVHWFramesContext *ctx)
 {
     AVD3D12VADeviceContext *device_hwctx = ctx->device_ctx->hwctx;
-    AVD3D12VAFramesContext *frames_hwctx = ctx->hwctx;
-    D3D12VAFramesContext   *s            = ctx->internal->priv;
+    D3D12VAFramesContext   *s            = ctx->hwctx;
+    AVD3D12VAFramesContext *frames_hwctx = &s->p;
 
     D3D12_COMMAND_QUEUE_DESC queue_desc = {
         .Type     = D3D12_COMMAND_LIST_TYPE_COPY,
@@ -168,7 +173,7 @@ fail:
 
 static void d3d12va_frames_uninit(AVHWFramesContext *ctx)
 {
-    D3D12VAFramesContext *s = ctx->internal->priv;
+    D3D12VAFramesContext *s = ctx->hwctx;
 
     D3D12_OBJECT_RELEASE(s->sync_ctx.fence);
     if (s->sync_ctx.event)
@@ -345,8 +350,8 @@ static int d3d12va_transfer_data(AVHWFramesContext *ctx, AVFrame *dst,
                                  const AVFrame *src)
 {
     AVD3D12VADeviceContext *hwctx        = ctx->device_ctx->hwctx;
-    AVD3D12VAFramesContext *frames_hwctx = ctx->hwctx;
-    D3D12VAFramesContext   *s            = ctx->internal->priv;
+    D3D12VAFramesContext   *s            = ctx->hwctx;
+    AVD3D12VAFramesContext *frames_hwctx = &s->p;
 
     int ret;
     int download = src->format == AV_PIX_FMT_D3D12;
@@ -675,8 +680,7 @@ const HWContextType ff_hwcontext_type_d3d12va = {
     .name                   = "D3D12VA",
 
     .device_hwctx_size      = sizeof(D3D12VADevicePriv),
-    .frames_hwctx_size      = sizeof(AVD3D12VAFramesContext),
-    .frames_priv_size       = sizeof(D3D12VAFramesContext),
+    .frames_hwctx_size      = sizeof(D3D12VAFramesContext),
 
     .device_create          = d3d12va_device_create,
     .device_init            = d3d12va_device_init,