VC-1/WMV3 DXVA2 implementation

 It allows VLD VC-1/WMV3 decoding using DXVA2 (GPU assisted decoding API under
VISTA and Windows 7).
 It is implemented by using AVHWAccel API.

Originally committed as revision 21424 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -1234,6 +1234,8 @@ tiff_encoder_suggest="zlib"
 truehd_decoder_select="mlp_decoder"
 tscc_decoder_select="zlib"
 vc1_decoder_select="h263_decoder"
+vc1_dxva2_hwaccel_deps="dxva2api_h"
+vc1_dxva2_hwaccel_select="dxva2 vc1_decoder"
 vc1_vaapi_hwaccel_deps="va_va_h"
 vc1_vaapi_hwaccel_select="vaapi vc1_decoder"
 vc1_vdpau_decoder_deps="vdpau_vdpau_h vdpau_vdpau_x11_h"
@@ -1251,6 +1253,7 @@ wmv1_encoder_select="h263_encoder"
 wmv2_decoder_select="h263_decoder"
 wmv2_encoder_select="h263_encoder"
 wmv3_decoder_select="vc1_decoder"
+wmv3_dxva2_hwaccel_select="vc1_dxva2_hwaccel"
 wmv3_vaapi_hwaccel_select="vc1_vaapi_hwaccel"
 wmv3_vdpau_decoder_select="vc1_vdpau_decoder"
 zlib_decoder_select="zlib"

libavcodec/Makefile

@@ -315,6 +315,7 @@ OBJS-$(CONFIG_VB_DECODER)              += vb.o
 OBJS-$(CONFIG_VC1_DECODER)             += vc1dec.o vc1.o vc1data.o vc1dsp.o \
                                           msmpeg4.o msmpeg4data.o           \
                                           intrax8.o intrax8dsp.o
+OBJS-$(CONFIG_VC1_DXVA2_HWACCEL)       += dxva2_vc1.o
 OBJS-$(CONFIG_VC1_VAAPI_HWACCEL)       += vaapi_vc1.o
 OBJS-$(CONFIG_VCR1_DECODER)            += vcr1.o
 OBJS-$(CONFIG_VCR1_ENCODER)            += vcr1.o

libavcodec/allcodecs.c

@@ -59,7 +59,9 @@ void avcodec_register_all(void)
     REGISTER_HWACCEL (H264_VAAPI, h264_vaapi);
     REGISTER_HWACCEL (MPEG2_VAAPI, mpeg2_vaapi);
     REGISTER_HWACCEL (MPEG4_VAAPI, mpeg4_vaapi);
+    REGISTER_HWACCEL (VC1_DXVA2, vc1_dxva2);
     REGISTER_HWACCEL (VC1_VAAPI, vc1_vaapi);
+    REGISTER_HWACCEL (WMV3_DXVA2, wmv3_dxva2);
     REGISTER_HWACCEL (WMV3_VAAPI, wmv3_vaapi);
 
     /* video codecs */