Support B-frames when decoding MPEG-4 with VDPAU hardware acceleration.

Based on a patch by NVIDIA.

Originally committed as revision 22160 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vdpau.c

@@ -317,6 +317,10 @@ void ff_vdpau_mpeg4_decode_picture(MpegEncContext *s, const uint8_t *buf,
     assert(render);
 
     /* fill VdpPictureInfoMPEG4Part2 struct */
+    render->info.mpeg4.trd[0]                            = s->pp_time;
+    render->info.mpeg4.trb[0]                            = s->pb_time;
+    render->info.mpeg4.trd[1]                            = s->pp_field_time >> 1;
+    render->info.mpeg4.trb[1]                            = s->pb_field_time >> 1;
     render->info.mpeg4.vop_time_increment_resolution     = s->avctx->time_base.den;
     render->info.mpeg4.vop_coding_type                   = 0;
     render->info.mpeg4.vop_fcode_forward                 = s->f_code;