hwcontext: add a VDPAU implementation

doc/APIchanges

@@ -17,6 +17,8 @@ API changes, most recent first:
   xxxxxxx buffer.h - Add av_buffer_pool_init2().
   xxxxxxx hwcontext.h - Add a new installed header hwcontext.h with a new API
                         for handling hwaccel frames.
+  xxxxxxx hwcontext_vdpau.h - Add a new installed header hwcontext_vdpau.h with
+                              VDPAU-specific hwcontext definitions.
 
 2016-xx-xx - xxxxxxx - lavf 57.3.0 - avformat.h
   Add AVFormatContext.opaque, io_open and io_close, allowing custom IO

libavutil/Makefile

@@ -24,6 +24,7 @@ HEADERS = adler32.h                                                     \
           frame.h                                                       \
           hmac.h                                                        \
           hwcontext.h                                                   \
+          hwcontext_vdpau.h                                             \
           imgutils.h                                                    \
           intfloat.h                                                    \
           intreadwrite.h                                                \
@@ -105,6 +106,7 @@ OBJS = adler32.o                                                        \
        xtea.o                                                           \
 
 OBJS-$(CONFIG_LZO)                      += lzo.o
+OBJS-$(CONFIG_VDPAU)                    += hwcontext_vdpau.o
 
 OBJS += $(COMPAT_OBJS:%=../compat/%)
 

libavutil/hwcontext.c

@@ -29,6 +29,9 @@
 #include "pixfmt.h"
 
 static const HWContextType *hw_table[] = {
+#if CONFIG_VDPAU
+    &ff_hwcontext_type_vdpau,
+#endif
     NULL,
 };
 

libavutil/hwcontext_internal.h

@@ -86,4 +86,6 @@ struct AVHWFramesInternal {
     AVBufferPool *pool_internal;
 };
 
+extern const HWContextType ff_hwcontext_type_vdpau;
+
 #endif /* AVUTIL_HWCONTEXT_INTERNAL_H */

libavutil/hwcontext_vdpau.h

+/*
+ * 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_VDPAU_H
+#define AVUTIL_HWCONTEXT_VDPAU_H
+
+#include <vdpau/vdpau.h>
+
+/**
+ * @file
+ * An API-specific header for AV_HWDEVICE_TYPE_VDPAU.
+ *
+ * This API supports dynamic frame pools. AVHWFramesContext.pool must return
+ * AVBufferRefs whose data pointer is a VdpVideoSurface.
+ */
+
+/**
+ * This struct is allocated as AVHWDeviceContext.hwctx
+ */
+typedef struct AVVDPAUDeviceContext {
+    VdpDevice          device;
+    VdpGetProcAddress *get_proc_address;
+} AVVDPAUDeviceContext;
+
+/**
+ * AVHWFramesContext.hwctx is currently not used
+ */
+
+#endif /* AVUTIL_HWCONTEXT_VDPAU_H */