hwcontext: add a dxva2 implementation

1 files changed, 72 insertions, 0 deletions

diff --git a/libavutil/hwcontext_dxva2.h b/libavutil/hwcontext_dxva2.h
new file mode 100644
index 0000000000..2290c26066
--- /dev/null
+++ b/libavutil/hwcontext_dxva2.h
@@ -0,0 +1,72 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+
+#ifndef AVUTIL_HWCONTEXT_DXVA2_H
+#define AVUTIL_HWCONTEXT_DXVA2_H
+
+/**
+ * @file
+ * An API-specific header for AV_HWDEVICE_TYPE_DXVA2.
+ *
+ * Only fixed-size pools are supported.
+ *
+ * For user-allocated pools, AVHWFramesContext.pool must return AVBufferRefs
+ * with the data pointer set to a pointer to IDirect3DSurface9.
+ */
+
+#include <d3d9.h>
+#include <dxva2api.h>
+
+/**
+ * This struct is allocated as AVHWDeviceContext.hwctx
+ */
+typedef struct AVDXVA2DeviceContext {
+    IDirect3DDeviceManager9 *devmgr;
+} AVDXVA2DeviceContext;
+
+/**
+ * This struct is allocated as AVHWFramesContext.hwctx
+ */
+typedef struct AVDXVA2FramesContext {
+    /**
+     * The surface type (e.g. DXVA2_VideoProcessorRenderTarget or
+     * DXVA2_VideoDecoderRenderTarget). Must be set by the caller.
+     */
+    DWORD               surface_type;
+
+    /**
+     * The surface pool. When an external pool is not provided by the caller,
+     * this will be managed (allocated and filled on init, freed on uninit) by
+     * libavutil.
+     */
+    IDirect3DSurface9 **surfaces;
+    int              nb_surfaces;
+
+    /**
+     * Certain drivers require the decoder to be destroyed before the surfaces.
+     * To allow internally managed pools to work properly in such cases, this
+     * field is provided.
+     *
+     * If it is non-NULL, libavutil will call IDirectXVideoDecoder_Release() on
+     * it just before the internal surface pool is freed.
+     */
+    IDirectXVideoDecoder *decoder_to_release;
+} AVDXVA2FramesContext;
+
+#endif /* AVUTIL_HWCONTEXT_DXVA2_H */