d3d12: Add d3d12download element

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5345>

subprojects/gst-plugins-bad/sys/d3d12/gstd3d12basefilter.cpp

@@ -0,0 +1,262 @@
+/* GStreamer
+ * Copyright (C) 2023 Seungha Yang <seungha@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#include "gstd3d12basefilter.h"
+#include "gstd3d12device.h"
+#include "gstd3d12utils.h"
+#include "gstd3d12memory.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_d3d12_base_filter_debug);
+#define GST_CAT_DEFAULT gst_d3d12_base_filter_debug
+
+#define META_TAG_VIDEO meta_tag_video_quark
+static GQuark meta_tag_video_quark;
+
+#define gst_d3d12_base_filter_parent_class parent_class
+G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstD3D12BaseFilter, gst_d3d12_base_filter,
+    GST_TYPE_BASE_TRANSFORM,
+    GST_DEBUG_CATEGORY_INIT (gst_d3d12_base_filter_debug,
+        "d3d12basefilter", 0, "d3d12 basefilter"));
+
+static void gst_d3d12_base_filter_dispose (GObject * object);
+static void gst_d3d12_base_filter_set_context (GstElement * element,
+    GstContext * context);
+static gboolean gst_d3d12_base_filter_start (GstBaseTransform * trans);
+static gboolean gst_d3d12_base_filter_stop (GstBaseTransform * trans);
+static gboolean gst_d3d12_base_filter_set_caps (GstBaseTransform * trans,
+    GstCaps * incaps, GstCaps * outcaps);
+static gboolean gst_d3d12_base_filter_get_unit_size (GstBaseTransform * trans,
+    GstCaps * caps, gsize * size);
+static gboolean
+gst_d3d12_base_filter_query (GstBaseTransform * trans,
+    GstPadDirection direction, GstQuery * query);
+static void gst_d3d12_base_filter_before_transform (GstBaseTransform * trans,
+    GstBuffer * buffer);
+static gboolean gst_d3d12_base_filter_transform_meta (GstBaseTransform * trans,
+    GstBuffer * outbuf, GstMeta * meta, GstBuffer * inbuf);
+
+static void
+gst_d3d12_base_filter_class_init (GstD3D12BaseFilterClass * klass)
+{
+  GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+  GstBaseTransformClass *trans_class = GST_BASE_TRANSFORM_CLASS (klass);
+
+  gobject_class->dispose = gst_d3d12_base_filter_dispose;
+
+  element_class->set_context =
+      GST_DEBUG_FUNCPTR (gst_d3d12_base_filter_set_context);
+
+  trans_class->start = GST_DEBUG_FUNCPTR (gst_d3d12_base_filter_start);
+  trans_class->stop = GST_DEBUG_FUNCPTR (gst_d3d12_base_filter_stop);
+  trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_d3d12_base_filter_set_caps);
+  trans_class->query = GST_DEBUG_FUNCPTR (gst_d3d12_base_filter_query);
+  trans_class->before_transform =
+      GST_DEBUG_FUNCPTR (gst_d3d12_base_filter_before_transform);
+  trans_class->transform_meta =
+      GST_DEBUG_FUNCPTR (gst_d3d12_base_filter_transform_meta);
+
+  gst_type_mark_as_plugin_api (GST_TYPE_D3D12_BASE_FILTER,
+      (GstPluginAPIFlags) 0);
+  meta_tag_video_quark = g_quark_from_static_string (GST_META_TAG_VIDEO_STR);
+}
+
+static void
+gst_d3d12_base_filter_init (GstD3D12BaseFilter * filter)
+{
+}
+
+static void
+gst_d3d12_base_filter_dispose (GObject * object)
+{
+  GstD3D12BaseFilter *self = GST_D3D12_BASE_FILTER (object);
+
+  gst_clear_object (&self->device);
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gst_d3d12_base_filter_set_context (GstElement * element, GstContext * context)
+{
+  GstD3D12BaseFilter *self = GST_D3D12_BASE_FILTER (element);
+
+  gst_d3d12_handle_set_context (element, context, -1, &self->device);
+
+  GST_ELEMENT_CLASS (parent_class)->set_context (element, context);
+}
+
+static gboolean
+gst_d3d12_base_filter_start (GstBaseTransform * trans)
+{
+  GstD3D12BaseFilter *self = GST_D3D12_BASE_FILTER (trans);
+
+  if (!gst_d3d12_ensure_element_data (GST_ELEMENT_CAST (self),
+          -1, &self->device)) {
+    GST_ERROR_OBJECT (self, "Failed to get D3D12 device");
+    return FALSE;
+  }
+
+  return TRUE;
+}
+
+static gboolean
+gst_d3d12_base_filter_stop (GstBaseTransform * trans)
+{
+  GstD3D12BaseFilter *self = GST_D3D12_BASE_FILTER (trans);
+
+  gst_clear_object (&self->device);
+
+  return TRUE;
+}
+
+static gboolean
+gst_d3d12_base_filter_set_caps (GstBaseTransform * trans, GstCaps * incaps,
+    GstCaps * outcaps)
+{
+  GstD3D12BaseFilter *self = GST_D3D12_BASE_FILTER (trans);
+  GstVideoInfo in_info, out_info;
+  GstD3D12BaseFilterClass *klass;
+  gboolean res;
+
+  if (!self->device) {
+    GST_ERROR_OBJECT (self, "No available D3D12 device");
+    return FALSE;
+  }
+
+  if (!gst_video_info_from_caps (&in_info, incaps)) {
+    GST_ERROR_OBJECT (self, "Invalid input caps %" GST_PTR_FORMAT, incaps);
+    return FALSE;
+  }
+
+  if (!gst_video_info_from_caps (&out_info, outcaps)) {
+    GST_ERROR_OBJECT (self, "Invalid output caps %" GST_PTR_FORMAT, outcaps);
+    return FALSE;
+  }
+
+  klass = GST_D3D12_BASE_FILTER_GET_CLASS (self);
+  if (klass->set_info)
+    res = klass->set_info (self, incaps, &in_info, outcaps, &out_info);
+  else
+    res = TRUE;
+
+  if (res) {
+    self->in_info = in_info;
+    self->out_info = out_info;
+  }
+
+  return res;
+}
+
+static gboolean
+gst_d3d12_base_filter_query (GstBaseTransform * trans,
+    GstPadDirection direction, GstQuery * query)
+{
+  GstD3D12BaseFilter *self = GST_D3D12_BASE_FILTER (trans);
+
+  switch (GST_QUERY_TYPE (query)) {
+    case GST_QUERY_CONTEXT:
+    {
+      if (gst_d3d12_handle_context_query (GST_ELEMENT (self), query,
+              self->device)) {
+        return TRUE;
+      }
+      break;
+    }
+    default:
+      break;
+  }
+
+  return GST_BASE_TRANSFORM_CLASS (parent_class)->query (trans, direction,
+      query);
+}
+
+static void
+gst_d3d12_base_filter_before_transform (GstBaseTransform * trans,
+    GstBuffer * buffer)
+{
+  GstD3D12BaseFilter *self = GST_D3D12_BASE_FILTER (trans);
+  GstD3D12Memory *dmem;
+  GstMemory *mem;
+  GstCaps *in_caps = nullptr;
+  GstCaps *out_caps = nullptr;
+
+  mem = gst_buffer_peek_memory (buffer, 0);
+  if (!gst_is_d3d12_memory (mem))
+    return;
+
+  dmem = GST_D3D12_MEMORY_CAST (mem);
+  /* d3d12 devices are singletons per adapter */
+  if (dmem->device == self->device)
+    return;
+
+  GST_INFO_OBJECT (self, "Updating device %" GST_PTR_FORMAT " -> %"
+      GST_PTR_FORMAT, self->device, dmem->device);
+
+  gst_object_unref (self->device);
+  self->device = (GstD3D12Device *) gst_object_ref (dmem->device);
+
+  in_caps = gst_pad_get_current_caps (GST_BASE_TRANSFORM_SINK_PAD (trans));
+  if (!in_caps) {
+    GST_WARNING_OBJECT (self, "sinkpad has null caps");
+    goto out;
+  }
+
+  out_caps = gst_pad_get_current_caps (GST_BASE_TRANSFORM_SRC_PAD (trans));
+  if (!out_caps) {
+    GST_WARNING_OBJECT (self, "Has no configured output caps");
+    goto out;
+  }
+
+  /* subclass will update internal object.
+   * Note that gst_base_transform_reconfigure() might not trigger this
+   * unless caps was changed meanwhile */
+  gst_d3d12_base_filter_set_caps (trans, in_caps, out_caps);
+
+  /* Mark reconfigure so that we can update pool */
+  gst_base_transform_reconfigure_src (trans);
+
+out:
+  gst_clear_caps (&in_caps);
+  gst_clear_caps (&out_caps);
+
+  return;
+}
+
+static gboolean
+gst_d3d12_base_filter_transform_meta (GstBaseTransform * trans,
+    GstBuffer * outbuf, GstMeta * meta, GstBuffer * inbuf)
+{
+  const GstMetaInfo *info = meta->info;
+  const gchar *const *tags;
+
+  tags = gst_meta_api_type_get_tags (info->api);
+
+  if (!tags || (g_strv_length ((gchar **) tags) == 1
+          && gst_meta_api_type_has_tag (info->api, META_TAG_VIDEO))) {
+    return TRUE;
+  }
+
+  return GST_BASE_TRANSFORM_CLASS (parent_class)->transform_meta (trans, outbuf,
+      meta, inbuf);
+}

subprojects/gst-plugins-bad/sys/d3d12/gstd3d12basefilter.h

@@ -0,0 +1,65 @@
+/* GStreamer
+ * Copyright (C) 2023 Seungha Yang <seungha@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include <gst/gst.h>
+#include <gst/video/video.h>
+#include <gst/base/gstbasetransform.h>
+#include "gstd3d12_fwd.h"
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_D3D12_BASE_FILTER             (gst_d3d12_base_filter_get_type())
+#define GST_D3D12_BASE_FILTER(obj)             (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_D3D12_BASE_FILTER,GstD3D12BaseFilter))
+#define GST_D3D12_BASE_FILTER_CLASS(klass)     (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_D3D12_BASE_FILTER,GstD3D12BaseFilterClass))
+#define GST_D3D12_BASE_FILTER_GET_CLASS(obj)   (GST_D3D12_BASE_FILTER_CLASS(G_OBJECT_GET_CLASS(obj)))
+#define GST_IS_D3D12_BASE_FILTER(obj)          (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_D3D12_BASE_FILTER))
+#define GST_IS_D3D12_BASE_FILTER_CLASS(klass)  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_D3D12_BASE_FILTER))
+
+typedef struct _GstD3D12BaseFilter GstD3D12BaseFilter;
+typedef struct _GstD3D12BaseFilterClass GstD3D12BaseFilterClass;
+
+struct _GstD3D12BaseFilter
+{
+  GstBaseTransform parent;
+
+  GstD3D12Device *device;
+
+  GstVideoInfo in_info;
+  GstVideoInfo out_info;
+};
+
+struct _GstD3D12BaseFilterClass
+{
+  GstBaseTransformClass parent_class;
+
+  gboolean  (*set_info) (GstD3D12BaseFilter * filter,
+                         GstCaps * in_caps,
+                         GstVideoInfo * in_info,
+                         GstCaps * out_caps,
+                         GstVideoInfo * out_info);
+};
+
+GType gst_d3d12_base_filter_get_type (void);
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(GstD3D12BaseFilter, gst_object_unref)
+
+G_END_DECLS
+

subprojects/gst-plugins-bad/sys/d3d12/gstd3d12download.cpp

@@ -0,0 +1,323 @@
+/* GStreamer
+ * Copyright (C) 2023 Seungha Yang <seungha@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "gstd3d12download.h"
+#include "gstd3d12bufferpool.h"
+#include "gstd3d12format.h"
+
+GST_DEBUG_CATEGORY_STATIC (gst_d3d12_download_debug);
+#define GST_CAT_DEFAULT gst_d3d12_download_debug
+
+static GstStaticPadTemplate sink_template =
+    GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
+    GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
+        (GST_CAPS_FEATURE_MEMORY_D3D12_MEMORY, GST_D3D12_ALL_FORMATS) "; "
+        GST_VIDEO_CAPS_MAKE_WITH_FEATURES
+        (GST_CAPS_FEATURE_MEMORY_D3D12_MEMORY ","
+            GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION,
+            GST_D3D12_ALL_FORMATS) "; "
+        GST_VIDEO_CAPS_MAKE (GST_D3D12_ALL_FORMATS) "; "
+        GST_VIDEO_CAPS_MAKE_WITH_FEATURES
+        (GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY ","
+            GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION,
+            GST_D3D12_ALL_FORMATS)));
+
+static GstStaticPadTemplate src_template =
+    GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+    GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE_WITH_FEATURES
+        (GST_CAPS_FEATURE_MEMORY_D3D12_MEMORY, GST_D3D12_ALL_FORMATS) "; "
+        GST_VIDEO_CAPS_MAKE_WITH_FEATURES
+        (GST_CAPS_FEATURE_MEMORY_D3D12_MEMORY ","
+            GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION,
+            GST_D3D12_ALL_FORMATS) "; "
+        GST_VIDEO_CAPS_MAKE (GST_D3D12_ALL_FORMATS) "; "
+        GST_VIDEO_CAPS_MAKE_WITH_FEATURES
+        (GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY ","
+            GST_CAPS_FEATURE_META_GST_VIDEO_OVERLAY_COMPOSITION,
+            GST_D3D12_ALL_FORMATS)));
+
+struct _GstD3D12Download
+{
+  GstD3D12BaseFilter parent;
+};
+
+#define gst_d3d12_download_parent_class parent_class
+G_DEFINE_TYPE (GstD3D12Download, gst_d3d12_download,
+    GST_TYPE_D3D12_BASE_FILTER);
+
+static GstCaps *gst_d3d12_download_transform_caps (GstBaseTransform * trans,
+    GstPadDirection direction, GstCaps * caps, GstCaps * filter);
+static gboolean gst_d3d12_download_propose_allocation (GstBaseTransform * trans,
+    GstQuery * decide_query, GstQuery * query);
+static gboolean gst_d3d12_download_decide_allocation (GstBaseTransform * trans,
+    GstQuery * query);
+static GstFlowReturn gst_d3d12_download_transform (GstBaseTransform * trans,
+    GstBuffer * inbuf, GstBuffer * outbuf);
+
+static void
+gst_d3d12_download_class_init (GstD3D12DownloadClass * klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+  GstBaseTransformClass *trans_class = GST_BASE_TRANSFORM_CLASS (klass);
+
+  gst_element_class_add_static_pad_template (element_class, &sink_template);
+  gst_element_class_add_static_pad_template (element_class, &src_template);
+
+  gst_element_class_set_static_metadata (element_class,
+      "Direct3D12 Downloader", "Filter/Video",
+      "Downloads Direct3D12 texture memory into system memory",
+      "Seungha Yang <seungha@centricular.com>");
+
+  trans_class->passthrough_on_same_caps = TRUE;
+
+  trans_class->transform_caps =
+      GST_DEBUG_FUNCPTR (gst_d3d12_download_transform_caps);
+  trans_class->propose_allocation =
+      GST_DEBUG_FUNCPTR (gst_d3d12_download_propose_allocation);
+  trans_class->decide_allocation =
+      GST_DEBUG_FUNCPTR (gst_d3d12_download_decide_allocation);
+  trans_class->transform = GST_DEBUG_FUNCPTR (gst_d3d12_download_transform);
+
+  GST_DEBUG_CATEGORY_INIT (gst_d3d12_download_debug,
+      "d3d12download", 0, "d3d12download Element");
+}
+
+static void
+gst_d3d12_download_init (GstD3D12Download * self)
+{
+}
+
+static GstCaps *
+_set_caps_features (const GstCaps * caps, const gchar * feature_name)
+{
+  GstCaps *tmp = gst_caps_copy (caps);
+  guint n = gst_caps_get_size (tmp);
+  guint i = 0;
+
+  for (i = 0; i < n; i++) {
+    gst_caps_set_features (tmp, i,
+        gst_caps_features_from_string (feature_name));
+  }
+
+  return tmp;
+}
+
+static GstCaps *
+gst_d3d12_download_transform_caps (GstBaseTransform * trans,
+    GstPadDirection direction, GstCaps * caps, GstCaps * filter)
+{
+  GstCaps *result, *tmp;
+
+  GST_DEBUG_OBJECT (trans,
+      "Transforming caps %" GST_PTR_FORMAT " in direction %s", caps,
+      (direction == GST_PAD_SINK) ? "sink" : "src");
+
+  if (direction == GST_PAD_SINK) {
+    tmp = _set_caps_features (caps, GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY);
+    tmp = gst_caps_merge (gst_caps_ref (caps), tmp);
+  } else {
+    GstCaps *newcaps;
+    tmp = gst_caps_ref (caps);
+
+    newcaps = _set_caps_features (caps, GST_CAPS_FEATURE_MEMORY_D3D12_MEMORY);
+    tmp = gst_caps_merge (tmp, newcaps);
+  }
+
+  if (filter) {
+    result = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
+    gst_caps_unref (tmp);
+  } else {
+    result = tmp;
+  }
+
+  GST_DEBUG_OBJECT (trans, "returning caps: %" GST_PTR_FORMAT, result);
+
+  return result;
+}
+
+static gboolean
+gst_d3d12_download_propose_allocation (GstBaseTransform * trans,
+    GstQuery * decide_query, GstQuery * query)
+{
+  GstD3D12BaseFilter *filter = GST_D3D12_BASE_FILTER (trans);
+  GstVideoInfo info;
+  GstBufferPool *pool;
+  GstCaps *caps;
+  guint size;
+  gboolean is_d3d12 = FALSE;
+
+  if (!GST_BASE_TRANSFORM_CLASS (parent_class)->propose_allocation (trans,
+          decide_query, query))
+    return FALSE;
+
+  /* passthrough, we're done */
+  if (!decide_query)
+    return TRUE;
+
+  gst_query_parse_allocation (query, &caps, nullptr);
+
+  if (!caps) {
+    GST_WARNING_OBJECT (filter, "Allocation query without caps");
+    return FALSE;
+  }
+
+  if (!gst_video_info_from_caps (&info, caps))
+    return FALSE;
+
+  if (gst_query_get_n_allocation_pools (query) == 0) {
+    GstCapsFeatures *features;
+    GstStructure *config;
+
+    features = gst_caps_get_features (caps, 0);
+
+    if (features && gst_caps_features_contains (features,
+            GST_CAPS_FEATURE_MEMORY_D3D12_MEMORY)) {
+      GST_DEBUG_OBJECT (filter, "upstream support d3d12 memory");
+      pool = gst_d3d12_buffer_pool_new (filter->device);
+      is_d3d12 = TRUE;
+    } else {
+      pool = gst_video_buffer_pool_new ();
+    }
+
+    config = gst_buffer_pool_get_config (pool);
+
+    gst_buffer_pool_config_add_option (config,
+        GST_BUFFER_POOL_OPTION_VIDEO_META);
+    if (!is_d3d12) {
+      gst_buffer_pool_config_add_option (config,
+          GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT);
+    }
+
+    size = GST_VIDEO_INFO_SIZE (&info);
+    gst_buffer_pool_config_set_params (config, caps, size, 0, 0);
+
+    if (!gst_buffer_pool_set_config (pool, config)) {
+      GST_ERROR_OBJECT (filter, "Bufferpool config failed");
+      gst_object_unref (pool);
+      return FALSE;
+    }
+
+    /* d3d12 buffer pool will update buffer size based on allocated texture,
+     * get size from config again */
+    config = gst_buffer_pool_get_config (pool);
+    gst_buffer_pool_config_get_params (config,
+        nullptr, &size, nullptr, nullptr);
+    gst_structure_free (config);
+
+    gst_query_add_allocation_pool (query, pool, size, 0, 0);
+    gst_object_unref (pool);
+  }
+
+  gst_query_add_allocation_meta (query, GST_VIDEO_META_API_TYPE, nullptr);
+  gst_query_add_allocation_meta (query,
+      GST_VIDEO_OVERLAY_COMPOSITION_META_API_TYPE, nullptr);
+
+  return TRUE;
+}
+
+static gboolean
+gst_d3d12_download_decide_allocation (GstBaseTransform * trans,
+    GstQuery * query)
+{
+  GstBufferPool *pool = nullptr;
+  GstStructure *config;
+  guint min, max, size;
+  gboolean update_pool;
+  GstCaps *outcaps = nullptr;
+
+  gst_query_parse_allocation (query, &outcaps, nullptr);
+
+  if (!outcaps) {
+    GST_WARNING_OBJECT (trans, "Allocation query without caps");
+    return FALSE;
+  }
+
+  if (gst_query_get_n_allocation_pools (query) > 0) {
+    gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
+
+    update_pool = TRUE;
+  } else {
+    GstVideoInfo vinfo;
+
+    gst_video_info_from_caps (&vinfo, outcaps);
+    size = vinfo.size;
+    min = max = 0;
+    update_pool = FALSE;
+  }
+
+  if (!pool) {
+    pool = gst_video_buffer_pool_new ();
+  }
+
+  config = gst_buffer_pool_get_config (pool);
+  gst_buffer_pool_config_add_option (config, GST_BUFFER_POOL_OPTION_VIDEO_META);
+  gst_buffer_pool_config_set_params (config, outcaps, size, min, max);
+  gst_buffer_pool_set_config (pool, config);
+
+  /* d3d12 buffer pool will update buffer size based on allocated texture,
+   * get size from config again */
+  config = gst_buffer_pool_get_config (pool);
+  gst_buffer_pool_config_get_params (config, nullptr, &size, nullptr, nullptr);
+  gst_structure_free (config);
+
+  if (update_pool)
+    gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);
+  else
+    gst_query_add_allocation_pool (query, pool, size, min, max);
+
+  gst_object_unref (pool);
+
+  return GST_BASE_TRANSFORM_CLASS (parent_class)->decide_allocation (trans,
+      query);
+}
+
+static GstFlowReturn
+gst_d3d12_download_transform (GstBaseTransform * trans, GstBuffer * inbuf,
+    GstBuffer * outbuf)
+{
+  GstD3D12BaseFilter *filter = GST_D3D12_BASE_FILTER (trans);
+  GstVideoFrame in_frame, out_frame;
+  GstFlowReturn ret = GST_FLOW_OK;
+
+  if (!gst_video_frame_map (&in_frame, &filter->in_info, inbuf, GST_MAP_READ)) {
+    GST_ERROR_OBJECT (filter, "Couldn't map input frame");
+    return GST_FLOW_ERROR;
+  }
+
+  if (!gst_video_frame_map (&out_frame,
+          &filter->out_info, outbuf, GST_MAP_WRITE)) {
+    GST_ERROR_OBJECT (filter, "Couldn't map output frame");
+    gst_video_frame_unmap (&in_frame);
+    return GST_FLOW_ERROR;
+  }
+
+  if (!gst_video_frame_copy (&out_frame, &in_frame)) {
+    GST_ERROR_OBJECT (filter, "Copy failed");
+    ret = GST_FLOW_ERROR;
+  }
+
+  gst_video_frame_unmap (&out_frame);
+  gst_video_frame_unmap (&in_frame);
+
+  return ret;
+}

subprojects/gst-plugins-bad/sys/d3d12/gstd3d12download.h

@@ -0,0 +1,31 @@
+/* GStreamer
+ * Copyright (C) 2023 Seungha Yang <seungha@centricular.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#pragma once
+
+#include "gstd3d12basefilter.h"
+
+G_BEGIN_DECLS
+
+#define GST_TYPE_D3D12_DOWNLOAD (gst_d3d12_download_get_type())
+G_DECLARE_FINAL_TYPE (GstD3D12Download,
+    gst_d3d12_download, GST, D3D12_DOWNLOAD, GstD3D12BaseFilter);
+
+G_END_DECLS
+

subprojects/gst-plugins-bad/sys/d3d12/gstd3d12format.h

@@ -34,7 +34,7 @@ G_BEGIN_DECLS
 #define GST_D3D12_SRC_FORMATS \
     "{ " GST_D3D12_COMMON_FORMATS " }"
 
-#define GST_D3D12_FORMATS_ALL \
+#define GST_D3D12_ALL_FORMATS \
     "{ " GST_D3D12_COMMON_FORMATS " }"
 
 struct _GstD3D12Format

subprojects/gst-plugins-bad/sys/d3d12/meson.build

@@ -1,8 +1,10 @@
 d3d12_sources = [
   'gstd3d12av1dec.cpp',
+  'gstd3d12basefilter.cpp',
   'gstd3d12bufferpool.cpp',
   'gstd3d12decoder.cpp',
   'gstd3d12device.cpp',
+  'gstd3d12download.cpp',
   'gstd3d12fence.cpp',
   'gstd3d12format.cpp',
   'gstd3d12h264dec.cpp',

subprojects/gst-plugins-bad/sys/d3d12/plugin.cpp

@@ -23,6 +23,7 @@
 
 #include <gst/gst.h>
 #include "gstd3d12device.h"
+#include "gstd3d12download.h"
 #include "gstd3d12h264dec.h"
 #include "gstd3d12h265dec.h"
 #include "gstd3d12vp9dec.h"
@@ -93,6 +94,9 @@ plugin_init (GstPlugin * plugin)
     gst_object_unref (device);
   }
 
+  gst_element_register (plugin,
+      "d3d12download", GST_RANK_NONE, GST_TYPE_D3D12_DOWNLOAD);
+
   return TRUE;
 }