Add x86 64bit asm code for downsample
Align C version to asm function.
add return info for all cases
Revert "turn off LTR for screen content. after checking LTR logic, will turn on"

This reverts commit 0fda3d92354f3593f12efe8c18aee109cc5836c3.
Merge pull request #1139 from huili2/parse_fail_master

add return info for all cases
Merge pull request #1140 from zhilwang/x86_64-downsample

Add X86 64bit asm code for downsample
add openh264 xcode and adjust processing xcode project
add BasicInitialize UT and some fix in create/destroy encoder in the existing interface test
Merge pull request #1145 from sijchen/interfaceUT11

add BasicInitialize UT and fix in existing interface test
Merge pull request #1144 from syureyi/openh264xcode

add openh264 xcode and adjust processing xcode project