MPEG-2 DXVA2 implementation

 It allows VLD MPEG-2 decoding using DXVA2 (GPU assisted decoding API under
VISTA and Windows 7).
 It is implemented by using AVHWAccel API.

Originally committed as revision 23644 to svn://svn.ffmpeg.org/ffmpeg/trunk

configure

@@ -1260,6 +1260,8 @@ mpeg4_decoder_select="h263_decoder mpeg4video_parser"
 mpeg4_encoder_select="h263_encoder"
 mpeg_vdpau_decoder_select="vdpau mpegvideo_decoder"
 mpeg1_vdpau_decoder_select="vdpau mpeg1video_decoder"
+mpeg2_dxva2_hwaccel_deps="dxva2api_h"
+mpeg2_dxva2_hwaccel_select="dxva2 mpeg2video_decoder"
 mpeg2_vaapi_hwaccel_select="vaapi mpeg2video_decoder"
 mpeg4_vaapi_hwaccel_select="vaapi mpeg4_decoder"
 mpeg4_vdpau_decoder_select="vdpau mpeg4_decoder"

libavcodec/Makefile

@@ -228,6 +228,7 @@ OBJS-$(CONFIG_MPEG1VIDEO_ENCODER)      += mpeg12enc.o mpegvideo_enc.o \
                                           motion_est.o ratecontrol.o  \
                                           mpeg12.o mpeg12data.o       \
                                           mpegvideo.o error_resilience.o
+OBJS-$(CONFIG_MPEG2_DXVA2_HWACCEL)     += dxva2_mpeg2.o
 OBJS-$(CONFIG_MPEG2_VAAPI_HWACCEL)     += vaapi_mpeg2.o
 OBJS-$(CONFIG_MPEG2VIDEO_DECODER)      += mpeg12.o mpeg12data.o \
                                           mpegvideo.o error_resilience.o

libavcodec/allcodecs.c

@@ -57,6 +57,7 @@ void avcodec_register_all(void)
     REGISTER_HWACCEL (H263_VAAPI, h263_vaapi);
     REGISTER_HWACCEL (H264_DXVA2, h264_dxva2);
     REGISTER_HWACCEL (H264_VAAPI, h264_vaapi);
+    REGISTER_HWACCEL (MPEG2_DXVA2, mpeg2_dxva2);
     REGISTER_HWACCEL (MPEG2_VAAPI, mpeg2_vaapi);
     REGISTER_HWACCEL (MPEG4_VAAPI, mpeg4_vaapi);
     REGISTER_HWACCEL (VC1_DXVA2, vc1_dxva2);