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Adding FEI encoder to core lib. The code is splitted into three session: 1: gstvaapiencoder_h264_fei.{h,c} This is the replica of gstvaapiencoder_h264.{c,h} but with FEI. All the modes ENC, PAK and ENC_PAK are running based the code in these files. 2: gstvaapifeienc_h264.{h,c} Abstract implementation intended for ENC (only VME) operation. 3: gstvaapifeipak_h264.{h,c} Abstrct implementation intended for PAK (only the PAK module) Right now ENC_PAK, ENC and PAK are running based on code in gstvaapiencoder_h264_fei.{h,c}. The abstract implementations in gstvaapifeienc_h264.{h,c} and gstvaapifeipak_h264.{h,c} are needed if user request for ENC+PAK mode operation. ENC+PAK: Here we need to invoke two sequence of vaBeginPicture/vaRenderPicutre/vaEndPicture for each frame, first for the ENC only and the second for PAK only. Each mode associated with separate context ,but same pool of surfaces are shared between the modes. This is more useful once we have custom BRC algorithms. Other Contributors: Wang, Yi <yi.a.wang@intel.com> Leilei <leilei.shang@intel.com> Zhong, Xiaoxia <xiaoxia.zhong@intel.com> xiaominc <xiaomin.chen@intel.com> Li, Jing B <jing.b.li@intel.com> https://bugzilla.gnome.org/show_bug.cgi?id=785712 https://bugzilla.gnome.org/show_bug.cgi?id=7846677e0d5b93
