ref: 3d655805f24dbdfbd641e82ccb2d9939850f5e6e
parent: 9dcbbe3d487626d9b8a8877ece66a2982730004e
author: Yaowu Xu <yaowu@google.com>
date: Tue Apr 23 07:06:11 EDT 2013
Use same intra prediction for all block size The commmit changed to use same intra prediction function for all block sizes. Some details on the changes: 1. All directional modes except DC/TM/V/H now have built-in filtering for all pixels with filter taps either (1, 2, 1)/4 or (1, 1)/2. 2. Above edge get automatic extended to double width (bw*2), which makes a lot of the prediciton mode computation simpler. 3. Same intra prediction function is called with different size for i4x4_pred and all other larger size. Overall, the change helped keyframe only coding for both cif size and std-hd size test sets by .5% consistently on all encodings. For normal coding with single/auto key frame, the change now also is consistently net positive for all encodings. The overall gains is about .15% on std-hd set. Change-Id: I01ceb31fbc73d49776262e6bdc06853b03bbd1d1