third_party/libvpx_new/README.chromium

Name: libvpx
URL: http://www.webmproject.org
Version: v1.4.0
License: BSD
License File: source/libvpx/LICENSE
Security Critical: yes

Date: Tuesday September 22 2015
Branch: master
Commit: 90a109f0eef8bfaaa4869cf7b2873dac5076b582

Description:
Contains the sources used to compile libvpx binaries used by Google Chrome and
Chromium.

The libvpx source is from webmproject.org:
  http://www.webmproject.org/code/
  https://chromium.googlesource.com/webm/libvpx

Please follow these steps to update libvpx source code:

1. Update the code:
     cd source/libvpx
     git fetch
     git checkout NEW_HASH

   For a list of changes for the commit message run:
     cd source/libvpx
     git log --no-merges --topo-order --pretty="%h %s" --max-count=20 \
       OLD_HASH..NEW_HASH

2. Generate .gypi, .gni and config files.

   ./generate_gypi.sh

3. Change the libvpx_new revision in src/DEPS to the desired hash from upstream
   libvpx. Update README.chromium with Date, Branch, and Commit.

4. Commit the changes in root (I.e README & .gypi files) and
   source/config directories. The commit message should look like this:

   Roll libvpx OLD_HASH:NEW_HASH

   git log from upstream:
   90a109f Restrict get_msb inputs
   8903b9f remove static from fdct4/8/16/32
   dd4f953 Remove vpx_filter_block1d16_v8_intrin_ssse3
   38ad2dc Non-rd pickmode: Don't skip checking zeromv-last mode.
   d6be267 Create sub8x8 block inter prediction function
   571b7c9 vp9_end_to_end_test: disable vp10 w/high bitdepth
   <..>

Tools needed to build libvpx:

- generate_gypi.sh

Generate config and .gypi files that contain the source list for each platform.
Configuration for the build is taken from vpx_config.h for each platform.

- lint_config.sh

A tool to verify vpx_config.h and vpx_config.asm are matched. This also
prints the final configuration after checking.